>For example, due to the front panel 90 disposed on the front of the dishwasher 1, the dishwasher 1 may not include a display configured to display a state to the front side of the dishwasher 1.

For example, the dishwasher 1 may include a display apparatus 100 configured to display an image I on a floor B on which the dishwasher 1 is installed. As described above, the state of the dishwasher 1 may not be displayed forward due to the front panel 90 disposed on the front of the dishwasher 1, and thus the display apparatus 100 may display the state of the dishwasher 1 by projecting the image I on the floor B.

For example, the display apparatus 100 may be configured to allow the image I to be display on the outside by projecting light, which is emitted from a light source, to an image.

For example, the display apparatus 100 may be disposed inside the door 20.

For example, the display apparatus 100 may be disposed inside the outer surface 22 of the door 20.

For example, the display apparatus 100 may be disposed on a rear side of the front panel 90.

For example, the display apparatus 100 may be disposed outside the dishwasher 1. The display apparatus 100 may receive information about the state of the dishwasher 1 through wireless communication and display the state of the dishwasher 1 as an image I.

For example, the display apparatus 100 may be disposed on the rear side of the front panel 90 and spaced apart from the dishwasher 1.

For example, the display apparatus 100 may be disposed in a space different from the dishwasher 1. The display apparatus 100 may receive information about the state of the dishwasher 1 through wireless communication and display the state of the dishwasher 1 as an image I. For example, when the dishwasher 1 is disposed in a kitchen of an internal space, the display apparatus 100 may be disposed in a living room. For example, the display apparatus 100 may be disposed on an art wall of a living room or on an inside of a wall forming the living room so as to project an image I on the floor of the living room.

However, hereinafter a type in which the display apparatus 100 is disposed inside the outer surface 22 will be described as an example.

FIG. 4 is a control block diagram of the dishwasher according to an embodiment, FIG. 5 is a conceptual diagram of a display apparatus according to an embodiment, FIG. 6 is a perspective view of the display apparatus according to an embodiment, FIG. 7 is a perspective view of the display apparatus according to an embodiment, and FIG. 8 is a cross-sectional view of the display apparatus according to an embodiment.

As illustrated in FIGS. 4 and 5, the display apparatus 100 may include an image generator 1000 configured to generate an image I.

For example, the display apparatus 100 may include a display controller 900 configured to control the display apparatus 100. The display controller 900 may transmit/receive a signal with a main controller 9 of the dishwasher 1 to control the display apparatus 100 to allow the display apparatus 100 to perform an operation.

For example, the display controller 900 may be provided as part of the main controller 9 of the dishwasher 1 or provided as a separate component from the main controller 9 to communicate with the main controller 9 by wire or wirelessly.

The display controller 900 may include at least one memory and at least one processor to perform the above-described operation and an operation to be described later.

For example, the memory and the processor may be implemented as separate chips. For example, a processor may include one or more processor chips or one or more processing cores. For example, the memory may include one or two or more memory chips or one or two or more memory blocks. For example, the memory and the processor may be implemented as a single chip.

As illustrated in FIGS. 5 to 8, the image generator 1000 may include a light source 1100.

The image generator 1000 may include a display device 1200 configured to transmit light generated from the light source 1100 and configured to display an image i1.

The image generator 1000 may include an illumination lens 1300 configured to condense light generated from the light source 1100 toward the display device 1200.

The image generator 1000 may include a reflector 1400 configured to guide light generated from the light source 1100 to the illumination lens 1300.

The image generator 1000 may include a printed circuit board 1500 on which chips forming the above-described memory and processor are mounted.

The display apparatus 100 may include an adjustor 2000 including a refractive lens 2100 provided to adjust a size of an image formed by the image generator 1000.

The adjustor 2000 may be configured to adjust the size and to focus of the image I projected on the floor B by adjusting the size of an image I displayed on the display device 1200.

The adjustor 2000 may be configured to allow the image I, which has a larger size than the image I displayed on the display device 1200, to be projected onto the floor B.

The adjustor 2000 may be configured to adjust the focus of the image I projected on the floor B to increase the user's visibility of the image I.

The adjustor 2000 may be configured to adjust the focus of the image I displayed on the floor B by moving relative to the image generator 1000.

When an image generated by the image generator 1000 is transmitted through the adjustor 2000, a distance between the image generator 1000 and the adjustor 2000 may be adjusted by the movement of the adjustor 2000, and accordingly, the size and focus of the image I displayed on the floor B may be adjusted.

For example, the adjustor 2000 may be disposed below the image generator 1000 and may move relative to the image generator 1000 in the vertical direction. Accordingly, the size and focus of the image I displayed on the floor B may be adjusted.

The display apparatus 100 may include a housing 3000 in which the image generator 1000 and the adjustor 2000 are accommodated.

In the case of a display apparatus that projects an image, a projection distance of more than a predetermined distance from the display apparatus to display an image is required, and a predetermined light path lp1 between the image generator and the adjustor is required to project an image according to the projection distance.

Accordingly, in the display apparatus, a housing is formed to cover the image generator, the adjustor, and the light path lp1, respectively. As the respective housings are spaced apart from each other, a volume of the display apparatus may be increased.

In the case of a display apparatus that is a projector type to display a state of a home appliance, the display apparatus is configured to project an image to a lower side of the home appliance and thus it is appropriate that the display apparatus is disposed in a lower portion of a front surface of the home appliance, particularly, an inside of a door of the home appliance or an inside of a panel of the home appliance forming the front surface.

At this time, when a volume of the display apparatus increases, it is difficult to arrange the display apparatus to the inside of the door or the inside of the panel of the home appliance.

When the light path lp1 between the image generator and the adjustor is reduced or limited to a certain length for reducing the volume of the display apparatus, the resolution of the image displayed on the floor may be reduced because a focal range of the image displayed on the floor is limited. Further, a location on which the display apparatus is installed is limited, and thus there is difficulty in installing the display apparatus.

For example, the display apparatus 100 may be provided in such a way that the image generator 1000, the adjustor 2000, and the light path lp1 between the image generator 1000 and the adjustor 2000 are all arranged in the housing 3000 formed as a unit. Therefore, it is possible to ease the above-mentioned difficulty.

The volume of the display apparatus 100 is minimized by the housing 3000 that is formed as a unit. Accordingly, the display apparatus 100 may be easily installed inside the door 20.

The housing 3000 may be provided in such a way that the adjustor 2000 is configured to move relative to the image generator 1000 so as to change a distance between the image generator 1000 and the adjustor 2000.

Accordingly, the resolution and size of the image I displayed on the floor B may be adjusted by adjusting the distance between the image generator 1000 and the adjustor 2000 even in various installation positions of the display apparatus 100 in the vertical direction. For example, the distance between the image generator 1000 and the adjustor 2000 may be adjusted in a plurality of steps or continuously.

Particularly, the housing 3000 may include a first housing 3100 on which the image generator 1000 is mounted and a second housing 3200 on which the adjustor 2000 is mounted.

For example, all components forming the image generator 1000 may be installed inside the first housing 3100.

For example, all components forming the adjustor 2000 may be installed inside the second housing 3200.

The second housing 3200 may be coupled to the first housing 3100 so as to move relative to the first housing 3100.

For example, the second housing 3200 may be disposed below the first housing 3100.

For example, the second housing 3200 may be coupled to the first housing 3100 from the lower side to the upper side of the first housing 3100 with respect to the vertical direction. For example, the first housing 3100 may be disposed above the second housing 3200 with respect to the vertical direction.

For example, the second housing 3200 may be provided to move with respect to the first housing 3100.

For example, the second housing 3200 may move relative to the first housing 3100 with respect to the relative vertical direction.

Accordingly, all components forming the image generator 1000 are disposed inside the first housing 3100 and all components forming the adjustor 2000 are disposed inside the second housing 3200. Further, the first housing 3100 and the second housing 3100 are configured to be coupled to each other. Therefore, the housing 3000 may accommodate all configurations of the display apparatus 100, thereby minimizing the volume of the display apparatus 100.

In addition, as the second housing 3200 moves relative to the first housing 3100, the adjustor 2000 disposed inside the second housing 3200 may be configured to move relative to the image generator 1000 disposed inside the first housing 3100. Therefore, it is possible to easily adjust the size and resolution of the image I displayed on the floor B.

Light may be provided to be emitted from the first housing 3100 to the second housing 3200 in an extension direction of an optical axis A, and the image I formed in the display apparatus 100 may be projected to the outside through the second housing 3200. Accordingly, the second housing 3200 may include a projection hole 3220 through which the image I is projected from the display apparatus 100.

For example, the projection hole 3220 may be provided to open downward. For example, the optical axis A may be formed to extend downward from the light source 1100 toward the projection hole 3220.

The light source 1100, the illumination lens 1300, and the display device 1200 may be sequentially arranged from the top in the vertical direction inside the first housing 3100.

The reflector 1400 may be disposed between the light source 1100 and the illumination lens 1300 with respect to the vertical direction.

For example, the light source 1100 may be provided to be mounted on the printed circuit board 1500. For example, the light source 1100 may be provided to be mounted on a lower surface 1520 of the printed circuit board 1500 in the vertical direction. For example, in the first housing 3100, the printed circuit board 1500 may be disposed above the reflector 1400, the illumination lens 1300, and the display device 1200 with respect to the vertical direction.

For example, the printed circuit board 1500, on which the light source 1100 is mounted, the reflector 1400, the illumination lens 1300, and the display device 1200 may be sequentially disposed from the top in the vertical direction inside the first housing 3100.

For example, the printed circuit board 1500 may be disposed inside the first housing 3100 to allow a surface, on which the light source 1100 is mounted, to face downward.

For example, because the second housing 3200 is disposed below the first housing 3100 with respect to the vertical direction, the refractive lens 2100 may be disposed below the light source 1100, the illumination lens 1300, and the display device 1200 with respect to the vertical direction.

The light source 1100, the illumination lens 1300, the display device 1200, and the refractive lens 2100 may be sequentially disposed from the top in the vertical direction.

For example, because the light source 1100 is disposed on the lower surface 1520 of the printed circuit board 1500, the light source 1100 may be provided to emit light downward. Light emitted from the light source 1100 may be provided to sequentially pass through the illumination lens 1300, the display device 1200, and the refractive lens 2100.

Accordingly, the light source 1100, the illumination lens 1300, the display device 1200, and the refractive lens 2100 may be sequentially arranged around the optical axis A of the light emitted from the light source 1100.

The second housing 3200 may be configured to move relative to the first housing 3100 in the direction of the optical axis A. For example, the optical axis A of the display apparatus 100 may be formed from an upper side to a lower side according to the arrangement of the light source 1100, and the second housing 3200 may be configured to move vertically.

In a state in which the light source 1100, the illumination lens 1300, the display device 1200, and the refractive lens 2100 are sequentially arranged in the direction of the optical axis A, the refractive lens 2100 may be configured to move relative to the light source 1100, the illumination lens 1300, the display device 1200 along the optical axis A according to the relative movement of the second housing 3200.

Because the second housing 3200 moves relative to the first housing 3100 with respect to the optical axis A, the adjustor 2000 may be configured to move relative to the image generator 1000 in a state in which the image generator 1000 disposed inside the first housing 3100 is fixed.

The image I may be projected from the display apparatus 100 to the floor B while light is transmitted through each component along the optical axis A. The size and resolution of the image I may vary according to a length of the light path lp1 between the refractive lens 2100 and the display device 1200, and a throw distance L that is from the display apparatus 100 to a point where the image I is projected. The point where the image I is projected from the display apparatus 100 is the floor B, and as the throw distance L is formed constant, the size and resolution of the image I may be adjusted according to the length of the light path lp1 between the display device 1200 and the refractive lens 2100.

As for the location of the display device 1200 and the reflective lens 2100 that determines the length of the light path lp1, the display apparatus 100 may be configured to allow the location of the reflective lens 2100 to move according to the movement of the second housing 3200 in a state in which the location of the display device 1200 is fixed.

Particularly, as the second housing 3200 moves relative to the first housing 3100 with respect to the optical axis A, the refractive lens 2100 may move relative to the display device 1200 with respect to the optical axis A. Accordingly, the light path lp1 between the display device 1200 and the refractive lens 2100 may be easily changed through the movement of the second housing 3200.

That is, the resolution and size of the image I displayed on the floor B may be adjusted by simply moving the second housing 3200 relative to the first housing 3100, and accordingly, the volume of the display apparatus 100 may be minimized because an additional configuration or space for adjusting the resolution and size of the image I is unnecessary.

As illustrated in FIGS. 6 and 7, the second housing 3200 may be provided in a barrel shape and disposed adjacent to or away from the first housing 3100 by rotation.

For example, the second housing 3200 may be rotated in one direction and moved upward, and accordingly, the second housing 3200 may be disposed adjacent to the first housing 3100 to reduce the light path lp1.

For example, the second housing 3200 may be rotated in the opposite direction and moved downward, and accordingly, the second housing 3200 may be disposed away from the first housing 3100 to increase the light path lp1.

For example, the first housing 3100 may include a female screw member 3110 including a screw thread formed at a predetermined angle, and the second housing 3200 may include a male screw member 3210 provided to be inserted into the female screw member 3110 and movable by including a screw thread corresponding to the screw thread of the female screw member 3110.

A user can adjust the distance between the second housing 3200 and the first housing 3100 by rotating the second housing 3200, and accordingly, the light path lp1 may be adjusted and thus the focus of the image I may be adjusted.

While the second housing 3200 moves linearly on the extension direction of the optical axis A through the rotation of the second housing 3200, the distance between the display device 1200 and the refractive lens 2100 may be changed and thus the focus of the image I may be adjusted.

In addition, the light source 1100 of the display apparatus 100 may be configured to emit light so as to supply light to the display device 1200 as the second housing 3200 moves in the vertical direction.

For example, the light source 1100 may be provided as a light emitting diode (LED).

A brightness of the image I may be determined according to an output of the light source 1100, a light transmittance of the display device 1200, the efficiency of light use in the adjustor 2000, and the length of the projection distance between the display apparatus 100 and the floor B.

In addition, even when the image I maintains a constant brightness, the visibility of the image I may vary depending on the brightness around the floor B and the degree of reflectance or gloss of the floor B.

Accordingly, with the consideration that the brightness of the image I varies depending on the environment around the image I and that the length of the projection distance between the display apparatus 100 and the floor B varies, the light source 1100 may emit light with a predetermined output value to allow the image I to be displayed on the floor B with a brightness that is adjustable within a certain range.

For example, the light source 1100 may emit light to allow the brightness of the image I displayed on the floor B to be approximately 50 lx to 600 lx.

For example, the dishwasher 1 may include an illuminance sensor 85. For example, the illuminance sensor 85 may be provided as one component of the display apparatus 100.

For example, the illuminance sensor 85 may sense the brightness of the floor B on which the image I is displayed. For example, the display controller 9000 may control the output of the light source 1100 based on the value sensed by the illuminance sensor 85.

The light source 1100 may be mounted on the printed circuit board 1500 to receive power, and the on/off and output levels of the light source 1100 may be controlled through the display controller 9000. For example, the light source 1100 may be mounted on the lower surface 1520 of the printed circuit board 1500 with respect to the vertical direction and thus the light source 1100 may emit light downward.

For example, the printed circuit board 1500 may be arranged to allow mounting surfaces on both sides to be disposed in the vertical direction inside the first housing 3100. For example, the printed circuit board 1500 may be disposed in such a way that a longitudinal direction of the printed circuit board 1500 is directed in the left and right direction Y.

For example, a chip may be disposed on an upper surface 1510 of the printed circuit board 1500 and the light source 1100 may be disposed on the lower surface 1520.

For example, a cable 1530 provided to electrically connect a chip and the display device 1200 may be connected to the printed circuit board 1500.

For example, the printed circuit board 1500 may be electrically connected to the main board forming the main controller 9 of the dishwasher 1 through the cable.

For example, the printed circuit board 1500 may be equipped with a communication device for wireless communication with the main board or may be connected to the communication device.

For example, through the cable, the printed circuit board 1500 may be electrically connected to a power supplier configured to supply power to the printed circuit board 1500.

The reflector 1400 may be disposed between the light source 1100 and the illumination lens 1300 with respect to the vertical direction.

The reflector 1400 may be provided to reflect light, which is emitted from the surface of the light source 1100 at an angle greater than or equal to a predetermined angle, so as to guide the light to the illumination lens 1300.

For example, the reflector 1400 may be provided in a cylindrical shape extending in the vertical direction and including a hollow.

For example, the reflector 1400 may be provided in a polygonal column shape extending in the vertical direction and including a hollow.

For example, the reflector 1400 may be provided in a shape in which a cross-sectional area increases from an upper opening 1410, in which the light source 1100 is disposed, to a lower opening 1420 in which the illumination lens 1300 is disposed.

For example, the lower opening 1420 of the reflector 1400 may have a larger diameter than an aperture of the illumination lens 1300. This is to prevent a case, in which a part of the light reflected inside the reflector 1400 is additionally reflected inside the reflector 1400 without being transmitted through the illumination lens 1300, so as to prevent a reduction in the light efficiency.

For example, the inside of the reflector 1400 may be formed of a metal material.

For example, the inside of the reflector 1400 may be formed of a plastic material, and the outside of the reflector 1400 may be provided with a reflective coating.

For example, the inside of the reflector 1400 may be formed of a white material or painted in white.

The illumination lens 1300 may be provided to allow light to be uniformly emitted to an entire area of a display region of the display device 1200.

For example, the illumination lens 1300 may be provided to allow light to be vertically transmitted through the display region of the display device 1200.

For example, the illumination lens 1300 may be provided as a double-convex lens.

For example, the illumination lens 1300 may be provided to allow light to be emitted to the display device 1200 with a uniformity of 90% or more over the entire display region of the display device 1200. This is to minimize the luminance deviation of the image I projected on the floor B.

The light source 1100, the illumination lens 1300, and the display device 1200 may be sequentially arranged with respect to the optical axis A so as to allow the distance between the display device 1200 and the illumination lens 1300 to be less than the distance between the illumination lens 1300 and the light source 1100 with respect to the optical axis A. This is because it is easy for the light to vertically pass through the display region of the display device 1200 as the illumination lens 1300 is closer to the display device 1200.

For example, when a lens surface, which faces the light source 1100, of the illumination lens 1300 is defined as a first lens surface and a lens surface facing the display device 1200 is defined as a second lens surface, a curvature of the first lens surface may be provided to be greater than a curvature of the second lens surface. When the distance between the display device 1200 and the illumination lens 1300 is less than the distance between the illumination lens 1300 and the light source 1100, it is easy for the light to vertically pass through the display region of the display device 1200.

A light emitting area of the reflective lens 1300 with respect to a radial direction may be greater than an area of the display region of the display device 1200. When a center of the illumination lens 1300 and a center of the display region of the display device 1200 are arranged on the same line based on the center of the optical axis A, the display region of the display device 1200 in the radial direction of the optical axis A may be arranged inside the illumination lens 1300.

This is because the light is vertically emitted to the entire display region when the light emitting area of the reflective lens 1300 is greater than the area of the display region of the display device 1200. It is appropriate that the light emitting area of the illumination lens 1300 is 1.1 to 1.5 times larger than the display region of the display device 1200.

For example, the lens surface of the illumination lens 1300 may be provided as an aspheric surface. By adjusting a refractive index of light incident on an edge of the illumination lens 1300, a light output efficiency of the edge of the illumination lens 1300 may be increased, and accordingly, the uniformity of the amount of light incident on the display region of the display device 1200 may be increased.

For example, the illumination lens 1300 may be formed of polycarbonate (PC) material.

For example, the illumination lens 1300 may be formed of Polymethyl methacrylate (PMMA) material.

For example, the illumination lens 1300 may be formed of a glass material.

The display device 1200 may be provided to display information of the image I. As the light emitted from the light source 1100 passes through the display device 1200, an image displayed on the display device 1200 may be displayed on the image I projected onto the floor B.

For example, the display device 1200 may be provided as a liquid crystal display (LCD).

For example, the display device 1200 may be provided in the form of a film on which images, numbers, etc. are printed.

The display device 1200 may be provided to display a remaining operation time of the dishwasher 1, a contamination level, a reservation status, an error, an operating state, and the like. The display device 1200 may be configured to receive numbers, images, symbols, etc. and to display the numbers, images, symbols, etc. on the image I.

For example, the display device 1200 may be provided as an LCD, and a color filter may be included in the LCD so as to display various colors on the image I.

For example, the display device 1200 may be provided with an LCD, and it is appropriate that a diameter or width of the LCD is provided approximately 10 mm, and the display apparatus 100 may be configured to allow the image I displayed on the floor to be projected with a diameter greater than the diameter of the LCD.

For example, when the diameter or width of the LCD is provided approximately 10 mm and the light source 1100 is provided as an LED, the distance between the light source 1100 and the display region of the display device 1200 may be approximately 15 mm to 20 mm in consideration of the Lambertian distribution on a light emitting surface of the light source 1100. This is to maximize light efficiency emitted from the light source 1100 in consideration of the Lambertian distribution. For example, the illumination lens 1300 may be disposed within a distance between the light source 1100 and the display region of the display device 1200, and the distance between the illumination lens 1300 and the display region of the display device 1200 may be approximately 0.5 mm to 1.5 mm. This is to increase the efficiency of condensing light to the display device 1200 according to the refraction of the illumination lens 1300.

For example, the display device 1200 may be provided as an LCD, and the display device 1200 may include a 7-segment LCD to display numbers. For example, in a 7-segment LCD, a total area of segments displaying numbers may be 75% or more of the total display region of the 7-segment LCD. This is to maintain the brightness of the image I above a predetermined value by securing the area of the segment in the 7-segment LCD to a predetermined value or more.

The refractive lens 2100 may be configured to adjust the size and resolution of the image I projected onto the floor B.

A curvature, a thickness, a material, a position of the refractive lens 2100 may be variously set according to the size of the display region of the display device 1200, a target size of the image I, and a target resolution of the image I.

For example, the refractive lens 2100 may be provided in plurality according to the target size of the image I and the target resolution of the image I. For example, it is appropriate that the refractive lens 2100 includes 1 to 5 refractive lenses.

For example, the refractive lens 2100 may include a first refractive lens 2110 disposed most adjacent to the display apparatus, a second refractive lens 2120 disposed below the first refractive lens, and a third refractive lens 2130 disposed below the second refractive lens.

For example, the first refractive lens 2110 may be configured to allow light projected from the display device 1200 to travel in parallel while passing through the first refractive lens 2110.

The first refracting lens 2110 may include a first lens surface 2111 facing the display device 1200 and a second lens surface 2112 facing the first lens surface 2111.

For example, the first lens surface 2111 of the first refractive lens 2110 may be provided as a surface convex toward the display device 1200. The second lens surface 2112 of the first refractive lens 2110 may be provided as a flat surface.

For example, the second refractive lens 2120 may be provided as a concave lens.

For example, the second refractive lens 2120 may be configured to allow a bundle of light, which passes through the first refractive lens 2110, to expand.

For example, the third refractive lens 2130 may be provided as a convex lens.

For example, the third refractive lens 2130 may be configured to allow light, which passes through the second refractive lens 2120, to be condensed and to allow the image I to be displayed on the floor B.

For example, the light passing through the display device 1200 may sequentially pass through the first refractive lens 2110, the second refractive lens 2120, and the third refractive lens 2130 and be projected onto the floor B.

For example, through the first refractive lens 2110, the second refractive lens 2120, and the third refractive lens 2130, the display apparatus 100 may be configured to allow the image I to be display on the floor B with an area greater than the area of the display region of the display device 1200.

For example, it is appropriate that each of the first refractive lens 2110, the second refractive lens 2120, and the third refractive lens 2130 has a thickness of 2.5 mm or more.

For example, the curvature of each lens surface of the first refractive lens 2110, the second refractive lens 2120, and the third refractive lens 2130 may be provided to be 10 mm or more.

For example, the refractive lens 2100 may be formed of Polycarbonate (PC) material.

For example, the refractive lens 2100 may be formed of Polymethyl methacrylate (PMMA) material.

For example, the refractive lens 2100 may be formed of a glass material.

For example, the refractive lens 2100 may include a Cyclic Olefin Copolymers (COC) material.

The dishwasher 1 may be not exposed to the outside of the front panel 90 for the aesthetic design, and thus a lower end 90b of the front panel 90 may be lower than a lower end 20b of the door 20 of the dishwasher 1 with respect to the vertical direction. Further, the display apparatus 100 may be disposed on the rear side of the front panel 90 in the front and rear direction, and as the display apparatus 100 is disposed inside the door 20, the display apparatus 100 may be configured to emit light to the floor B from a position higher than the lower end 20b of the door 20 with respect to the vertical direction.

A portion of the light projected from the display apparatus 100 may be blocked by the lower end 20b of the door 20, and thus a part of the image I projected on the floor B may not be displayed. To prevent this, when an area of the display region of the display device 1200 is defined as d1, a height y of the third refractive lens 2130 from the floor B, a height h of the third refractive lens 2130 from the lower end 90b of the front panel 90, an aperture D of the third refractive lens 2130, and a distance x between the aperture D of the third refractive lens 2130 and the center of the aperture D of the third refractive lens 2130 from the rear end 90r of the front panel 90 in the front and rear direction may be provided to satisfy an equation of d1=2y/h*(x−D/2)+D.

For example, D is defined as the aperture of the third refractive lens 2130, but may be defined as an aperture of a lens including the largest aperture among the plurality of refractive lenses 2100. For example, among the plurality of refractive lenses 2100, the third refractive lens 2130 has the largest aperture, and thus D is defined as the aperture of the third refractive lens 2130. However, when the second refractive lens 2120 has an aperture greater than the aperture of the third refractive lens 2130, D may be defined as the aperture of the second refractive lens 2120.

Hereinafter the housing 3000 will be described in detail.

FIG. 9 is an exploded perspective view of a housing of the display apparatus according to an embodiment, and FIG. 10 is an exploded perspective view of a second housing of the display apparatus according to an embodiment.

As described above, the display apparatus 100 may be provided in such a way that the image generator 1000, the adjustor 2000, and the light path lp1 between the image generator 1000 and the adjustor 2000 are all arranged in the housing 3000 formed as a unit. Therefore, it is possible to minimize the volume of the display apparatus 100 and thus the display apparatus 100 may be disposed on the rear side of the front panel 90 or between the doors 20.

The first housing 3100 may include a first case 3120 and a second case 3130 to allow components forming the image generator 1000 to be accommodated inside the first housing 3100. The first case 3120 and the second case 3130 may be detachably coupled to each other. In a state in which the first case 3120 and the second case 3130 are separated, the components forming the image generator 1000 may be accommodated in the first case 3120 or the second case 3130, and the components forming the image generator 1000 may be disposed in the first housing 3100 by coupling the first case 3120 and the second case 3130.

For example, the first case 3120 and the second case 3130 may be coupled in the vertical direction. For example, the first case 3120 may be disposed on the upper side and the second case 3130 may be disposed on the lower side of the first case 3120.

For example, the first case 3120 may be provided in such a way that an upper surface 3123 is sealed and a lower surface is open. For example, the second case 3130 may be coupled to the opened lower surface of the first case 3120, thereby forming the first housing 3100.

For example, because the upper surface 3123 of the first case 3120 is sealed, it is possible to prevent moisture from entering the housing 3000 even when condensation occurs inside the door 20 of the dishwasher 1 on the upper side of the first housing 3100.

For example, the printed circuit board 1500, the light source 1100, the illumination lens 1300, the reflector 1400, and the display device 1200 may be disposed inside the first case 3120.

For example, the printed circuit board 1500 may be disposed in an upper portion of the inside of the first case 3120. As the upper surface 3123 of the first case 3120 is sealed, it is possible to prevent external moisture from entering the printed circuit board 1500.

For example, the first case 3120 may include a fixing member 3121 disposed inside the first case 3120, and configured to fix the printed circuit board 1500, the reflector 1400, the illumination lens 1300, and the display device 1200 inside the first case 3120.

For example, the printed circuit board 1500 may be fixed to an upper side of the fixing member 3121.

For example, the light source 1100, the illumination lens 1300, and the reflector 1400 may be disposed inside the fixing member 3121.

For example, the display device 1200 may be fixed to the lower side of the fixing member 3121.

For example, the fixing member 3121 may be provided to be coupled with the second case 3130.

Each component may be fixed to the inside of the first case 3120 by the fixing member 3121, and as the second case 3130 and the first case 3120 are coupled, each component may be disposed inside the first housing 3100 while being fixed to the fixing member 3121.

For example, the first case 3120 may include an outlet 3125 for discharging heat generated from the light source 1100. The printed circuit board 1500 and the light source 1100 may be damaged because the temperature inside the first housing 3100 rises due to the heat generated from the light source 1100. However, it is possible to circulate the heat through the outlet 3125 and to reduce the internal temperature of the first housing 3100 by heat dissipation through the heat circulation.

For example, the outlet 3125 may be disposed at a higher position than the printed circuit board 1500 to enable heat circulation. For example, the outlet 3125 may be provided in a shape in which a part of the first case 3120 is opened on an upper part of the first case 3120 so as to be disposed adjacent to the light source 1100. This is because the printed circuit board 1500 is disposed on the inner upper side of the first case 3120.

For example, an eave 3126 may be provided on the upper side of the outlet 3125 to prevent penetration of moisture from the outside.

For example, a chamfer 3124 may be included between the upper surface 3123 of the first case 3120 and a side surface 3128 extending downward from an edge of the upper surface 3123. This is to prevent moisture from accumulating on the upper surface 3123 when moisture flows into the display apparatus 100 due to water leakage inside the door 20. The chamfer 3124 may be provided to allow moisture introduced into the upper surface 3123 to flow to the lower portion of the first housing 3100 through the chamfer 3124.

The female screw member 3110 including a screw thread formed at a predetermined angle may be disposed in the second case 3130.

For example, the female screw member 3110 may be disposed in the lower portion of the second case 3130 and open downward.

The female screw member 3110 may include a hollow 3111 to allow the male screw member 3210 to be inserted into the female screw member 3110 and rotated. Light transmitted from the display device 1200 may be emitted to the second housing 3200 through the hollow 3111.

For example, the female screw member 3110 may be provided to extend from the upper end of the second case 3130 to the rear end. For example, the female screw member 3110 may be provided in a cylindrical or polygonal shape including the hollow 3111. For example, the display device 1200 may be disposed on the upper end of the female screw member 3110 to allow light transmitted from the display device 1200 to be directly emitted into the hollow 3111 of the female screw member 3110.

For example, the second housing 3200 may be provided in a barrel shape. For example, the second housing 3200 may be provided in a cylindrical or polygonal shape including a hollow.

The male screw member 3210 may be disposed in the upper portion of the second housing 3200 and thus when the male screw member 3210 is inserted into the female screw member 3110, the second housing 3200 may be coupled to the first housing 3100.

The second housing 3200 may include a lens accommodating member 3270 disposed under the male screw member 3210 and provided to accommodate the plurality of refractive lenses 2110, 2120, and 2130 inside the second housing 3200.

For example, the second housing 3200 may include a plurality of grooves 3250 extending in the direction of the optical axis A on an outer circumferential surface in which the lens accommodating member 3270 is disposed.

The plurality of grooves 3250 may have a shape 3250 in which a concave-convex shape or a groove-protrusion shape are repeated on the outer circumferential surface of the second housing 3200 in a circumferential direction of the second housing 3200 and provided to be disposed spaced apart from each other to be longer than an adjustable length lp2 along the direction of the optical axis A.

A user can adjust the height of the second housing 3200 by rotating the second housing 3200 to focus the image I. When the second housing 3200 is rotated, the male screw member 3210 may move upward or downward through the screw thread in the female screw member 3110, and thus the length of the light path lp1 may be adjusted.

The second housing 3200 may include a handle 3260 that protrudes in a radial direction of the second housing 3200 to allow a user to easily grip the second housing 3200.

For example, the handle 3260 may have an annular shape and more protrude than the outer circumferential surface of the lens accommodating member 3270 in the radial direction of the second housing 3200.

For example, the handle 3260 may protrude in the radial direction of the second housing 3200.

For example, the handle 3260 may be disposed lower than a stopper 3140 to be described later inserted into the lower portion of the plurality of concavo-convex grooves 3250 in the direction of the optical axis A.

For example, the handle 3260 may be disposed below the lens accommodating member 3270 in the vertical direction. For example, the handle 3260 may be disposed above the lens accommodating member 3270 in the vertical direction. For example, the handle 3260 may be disposed on the lens accommodating member 3270 in the vertical direction.

The male screw member 3210 may move upward or downward on the female screw member 3110 through rotation by the adjustable length lp2, and thus the length of the light path lp1 may be adjusted by the change in the length of the adjustable length lp2.

The adjustable length lp2 may be substantially equal to or less than the length of the male screw member 3210 in the vertical direction.

The concave-convex grooves 3250 may be provided equal to or greater than the focus adjustable length lp2 in the direction of the optical axis A in the vertical direction.

The first housing 3100 may include the stopper 3140 provided to restrict the arbitrary rotation of the second housing 3200 relative to the first housing 3100.

For example, the stopper 3140 may be detachably provided in the first housing 3100. For example, the stopper 3140 may be provided to be coupled to the second case 3130. For example, the stopper 3140 may be integrally formed with the second case 3130. Alternatively, the stopper 3140 may be integrally formed with the first case 3120.

For example, one or more stoppers 3140 may be provided. For example, the stopper 3140 may be provided as a pair. For example, the pair of stoppers 3140 may be in contact with both ends of the outer circumferential surface of the lens accommodating member 3270 in the direction of 180 degrees and thus the pair of stoppers 3140 may prevent the second housing 3200 from being rotated beyond the user's intended position.

For example, three or more stoppers 3140 may be provided. For example, the plurality of stoppers 3140 may be spaced apart from each other in a circumferential direction of an outer circumferential surface of the lens accommodating member 3270 and provided to be in contact with the lens accommodating member 3270.

For example, the stopper 3140 may prevent the second housing 3200 from being arbitrarily rotated by a force applied to the second housing 3200.

For example, a user can rotate the second housing 3200 by applying a greater force to the lens accommodating member 3270 than a force due to tension between the stopper 3140 and the lens accommodating member 3270.

For example, the stopper 3140 may include an arm 3141 extending in the direction of the optical axis A and an insertion protrusion 3142 disposed on the lower side of the arm 3141 and provided to be inserted into one of plurality of concave-convex grooves 3250.

For example, the arm 3141 may be formed of an elastic material. A state in which the insertion protrusion 3142 is inserted into the groove may be maintained by elasticity of the arm 3141 in a state in which the insertion protrusion 3142 is inserted into one of the plurality of grooves 3250. At this time, unless a user rotates the lens accommodating member 3270 with a force greater than the tension at which the insertion protrusion 3142 is inserted into the groove according to the elasticity of the arm 3141, the insertion protrusion 3142 may be maintained in a state of being inserted into the groove.

For example, the insertion protrusion 3142 may be inserted into one of the plurality of grooves 3250, thereby restricting the arbitrary rotation of the second housing 3200.

When the second housing 3200 is rotated by the user's pressure, the insertion protrusion 3142 may be separated from one of the plurality of grooves 3250, and when the rotation of the second housing 3200 is finished, the insertion protrusion 3142 may be inserted into any other groove, which is the closest to the insertion protrusion 3142 among the plurality of grooves 3250 after the rotation of the second housing 3200, so as to restrict the arbitrary rotation of the second housing 3200.

For example, when the insertion protrusion 3142 moves away from a high part of the outer circumferential surface of the lens accommodating member 3270 by rotation of the second housing 3200, the insertion protrusion 3142 may collide with a groove due to the elasticity of the arm 3141 of the stopper 3140 and a noise caused by the collision may be generated. Accordingly, a user can adjust the amount of rotation of the second housing 3200 by recognizing the sound during the adjusting process.

The second housing 3200 may include a first case 3230 and a second case 3240 to accommodate the plurality of refractive lenses 2110, 2120, and 2130 in the second housing 3200.

The first case 3230 and the second case 3240 may be provided to extend in the direction of the optical axis A and coupled to each other in a direction perpendicular to the optical axis A. This is to easily accommodate the plurality of refractive lenses 2110, 2120, and 2130 in the first case 3230 or the second case 3240.

When the first case 3230 and the second case 3240 are provided to be coupled in the direction of the optical axis A, it is required that the plurality of refractive lenses 2110, 2120, and 2130 may be accommodated in a stacked manner inside the first case 3230 or the second case 3240. However, in a process of stacking the plurality of refractive lenses 2110, 2120, and 2130, a tolerance in the position of the plurality of refractive lenses 2110, 2120, and 2130 may occur, thereby causing the displacement of the optical axis A.

However, the first case 3230 and the second case 3240 may be provided to extend in the direction of the optical axis A and coupled to each other in the direction perpendicular to the optical axis A. Accordingly, in a state in which the first case 3230 and the second case 3240 are separated, it is possible to accommodate the plurality of refractive lenses 2110, 2120, and 2130 in the direction perpendicular to the direction of the optical axis A in the first case 3230 or the second case 3240, and then the first case 3230 and the second case 3240 may be coupled to each other. Therefore, it is possible to allow the plurality of refractive lenses 2110, 2120, and 2130 to be accommodated in designated positions inside the second housing 3200.

The first refractive lens 2110 may include a first refractive lens holder 2111 surrounding an edge of the first refractive lens 2110. The lens accommodating member 3270 may include a first refractive lens insertion groove 3271, to which the first refractive lens holder 2111 is inserted, so as to allow the first refractive lens to be accommodated in the second housing 3200.

The second refractive lens 2120 may include a second refractive lens holder 2121 surrounding an edge of the second refractive lens 2120. The lens accommodating member 3270 may include a second refractive lens insertion groove 3272, to which the second refractive lens holder 2121 is inserted, so as to allow the second refractive lens to be accommodated in the second housing 3200.

The third refractive lens 2130 may include a third refractive lens holder 2131 surrounding an edge of the third refractive lens 2130. The lens accommodating member 3270 may include a third refractive lens insertion groove 3273, to which the third refractive lens holder 2131 is inserted, so as to allow the third refractive lens to be accommodated in the second housing 3200.

In the manufacturing process, because the size of the plurality of refractive lenses 2110, 2120, and 2130 is small, each of the refractive lenses 2110, 2120, and 2130 may be inserted into different refractive lens insertion grooves without being inserted into the corresponding refractive lens insertion grooves 3271, 3272, and 3273, and thus the plurality of refractive lenses 2110, 2120, and 2130 may be disposed in the wrong order in the vertical direction.

To prevent the above-mentioned difficulty, each of the refractive lens holders 2111, 2121, and 2131 may include a mark having a different size or shape.

The first refractive lens holder 2111 may include a first mark 2112.

The second refractive lens holder 2121 may include a second mark 2122.

The third refractive lens holder 2131 may include a third mark 2132.

The first refractive lens insertion groove 3271 may have a shape corresponding to the first mark 2112 to allow the first mark 2112 to be inserted therein.

The second refractive lens insertion groove 3272 may have a shape corresponding to the second mark 2122 to allow the second mark 2122 to be inserted therein.

The third refractive lens insertion groove 3273 may have a shape corresponding to the third mark 2132 to allow the third mark 2132 to be inserted therein.

In other words, the marks 2112, 2122, and 2132 are formed in different shapes or sizes, and thus unless the marks 2112, 2122, and 2132 are inserted to the corresponding refractive lens insertion grooves 3271, 3272, and 3273, the marks 2112, 2122, and 2132 may not be inserted into the refractive lens insertion grooves 3271, 3272, and 3273. Accordingly, each of the refractive lenses 2110, 2120, and 2130 may be easily accommodated in a predetermined position.

FIG. 11 is a bottom view of a display apparatus according to an embodiment, FIG. 12 is a schematic view illustrating a flow of air inside the display apparatus according to an embodiment, and FIG. 13 is a schematic view illustrating a flow of external liquid of the display apparatus according to an embodiment.

As described above, the first case 3120 may include the outlet 3125 for discharging heat generated by the light source 1100. While the heat generated by the light source 1100 may cause the temperature inside the first housing 3100 to rise, which may cause damage to the printed circuit board 1500 and the light source 1100. However, heat may be circulated through the outlet 3125, and the temperature inside the first housing 3100 may be reduced by heat dissipation due to the heat circulation.

For example, the first housing 3100 may include an inlet 3122 through which air flows into the first housing 3100. The air introduced through the inlet 3122 may circulate inside the first housing 3100, may be heat exchanged, and may then be discharged to the outside of the first housing 3100 through the outlet 3125.

For example, the inlet 3122 may be disposed in the second housing