, the actual brightness value of each of the first grayscale values L0-L63 is determined. Then, in the grayscale sorting step S200, the first grayscale values L27 and the first grayscale values L25 are exchanged according to the actual brightness values. Then, in the grayscale calibration table generation step S300, a grayscale calibration table from level 0 [Image Omitted]

to level 63 is established according to the re-sorted the first grayscale values L0 to L63, which comprising a plurality of second grayscale values L0 “ [Image Omitted]

to L63”. The second grayscale values are mapped to the first grayscale values re-sorted. For example, the second grayscale values L25″ and L27″ are mapped to first grayscale values L27 and L25 respectively, and actual brightness values corresponding to the second grayscale values L25″ and L27″ are the actual brightness values corresponding to L27 and L25 in the original grayscale range. As such, the issue of the discontinuous and jump-varying grayscale of the first grayscale values L25 to L27 of the grayscale range has been solved. Furthermore, the backlight division emitting light according to the grayscale calibration table, a relationship between of the second grayscale values of the backlight division and actual brightness values is as shown a grayscale-brightness relation chart in FIG. 7, the actual brightness value increases according to the increasing first grayscale value, and therefore the issue of the discontinuous and jump-varying grayscale is solved.

The grayscale calibration table output step S500 comprises connecting a brightness control unit of the backlight module 1 through a transmission line to output and store the grayscale calibration table into the brightness control unit. Particularly, the brightness control unit controls the backlight module output a calibrated backlight brightness value corresponding to the image according to the grayscale calibration table.

In a preferred embodiment of the present application, the brightness detection step S100 further comprises: detecting the actual brightness values of the first grayscale values in a grayscale range corresponding to each of the backlight divisions of the backlight module 1 of the display;

the grayscale calibration table generation step S300 further comprises: establishing the grayscale calibration tables corresponding to the backlight divisions 10 according to the first grayscale values resorted in each of the backlight division 10s, wherein each of the grayscale calibration tables comprises the second grayscale values, the second grayscale values are mapped to the first grayscale values re-sorted, and the actual brightness value corresponding to any smaller one of the second grayscale values is less than the actual brightness value corresponding to any greater one of the second grayscale values; and

the grayscale calibration table output step S500 further comprises: connecting a brightness control unit of the backlight module through a transmission line to output and store the grayscale calibration tables into the brightness control unit.

Specifically, driver transistor MOSFETs or light emission assemblies L in different ones of the backlight divisions 10 probably are different in performance to result in first grayscale values in the different ones of the backlight divisions 10 corresponding to different actual brightness values. Therefore, implementing backlight module brightness calibration to each backlight division 10 can acquire a better effect.

Specifically, a plurality of the grayscale calibration tables can also be integrated into a large grayscale calibration table according to actual demands, the present application has no limit thereto.

In a preferred embodiment of the present application, after the grayscale calibration table generation step S300, the method further comprises a division grayscale alignment step S400 comprising fine-adjusting a brightness value of a light emitting element of each of the backlight divisions such that the actual brightness values corresponding to the same second grayscale value in the grayscale calibration tables are equal.

Specifically, even backlight module brightness calibration has been implemented for different ones of the backlight divisions 10, brightness difference probably exists between different ones of the backlight divisions 10, and therefore the division grayscale alignment step S400 is needed.

Furthermore, in a qualified display device, employed light emitting elements L should be similar in light emission quality, and actual brightness values of the light emitting elements L under each first grayscale value should also be similar. Therefore, in the division grayscale alignment step S400, an alignment way of the grayscale calibration tables only requires to fine-adjust the lighting-up time length of the light emitting element L in each of the backlight divisions 10 under the first grayscale value such that the actual brightness values corresponding to the same second grayscale values in the grayscale calibration tables can be the same.

In a preferred embodiment of the present application, in the grayscale sorting step S200, the brightness value sequence is an increasing arrangement or an decreasing arrangement of the actual brightness values.

With reference to FIGS. 4 and 5, in a preferred embodiment of the present application, each of the backlight divisions 10 comprises a light emitting element L, the light emitting element L is configured to output the actual brightness values according to the first grayscale values in the grayscale range. the brightness control unit is configured to control each of the backlight divisions 10 to perform divisional light adjustment.

With reference to FIG. 4, the display device comprises a display panel 2 combining the backlight module 1, the display panel 2 comprises a plurality of pixel sets corresponding to the backlight divisions 10, and the pixel sets 20 display according to a plurality of pixel first grayscale values in a pixel grayscale range. the pixel grayscale range of the pixel sets 20 is greater than the grayscale range of the backlight divisions 10. Furthermore, the pixel set 20 comprises a plurality of unit pixels P. Particularly, the light emitting element L is a light emitting diode (Light Emitting Diode, LED), the light emitting diode can be a mini-light emitting diode (mini-LED) or a micro-light emitting diode (Micro-LED). Particularly, the display panel 2 is an open cell display panel, and forms a complete display device after combining the backlight module 1.

With reference to FIG. 5, in a preferred embodiment of the present application, each of the backlight divisions of the display device [Image Omitted] comprises a gate line, a data line, a light emitting element L, a driver transistor (for example: metal-oxide-semiconductor field-effect transistor (MOSFET)) connected to the light emitting element L, a switch transistor (for example: thin film transistor (TFT)) connected to the gate line, the data line, and the driver transistor, and a storage capacitor (Cst) connected between the driver transistor MOSFET and the switch transistor TFT. When the backlight divisions