This contest is closed.
Patexia is looking for prior art relating to a device which includes light emitting diodes (LEDs) with at least two LEDs with a phosphor to produce two different spectrums. The device further includes a processor and the appropriate user interface to take the data and configure / control the color of each of the two LEDs independently based on the data. It provides the ability to vary the intensity of each of the two LEDs and as a result vary the color temperature of the resulting spectrum within the pre-selected range of color temperatures.
Please note that it is not necessarily required, that both LEDs to be different types of LEDs, because it is known that the spectrums of LEDs with a phosphor shifts dependent on the applied current. So a device with two white LEDs that are differently electrified to vary the light temperature of the emitted (superimposed) light might meet the requirements as well.
Submitted documents describing this system must be:
filed, published, or disclosing the functioning of a system that was in public use or on sale before November 20th, 2000.
Not on the known references list
Submissions in Japanese, Korean or Chinese will have 5 bonus points.
Non-patent literature will have additional 5 bonus points
|1||Is the reference either a US patent published, a foreign patent published, a European Patent filed, a non-patent document published or a description of a system that was in public use or on sale before November 20, 2000?||T/F|
|2||Does the reference describe a device with at least two LEDs?||5|
|3||Are both LEDs white light LEDs?||10|
|4||Do both LEDs have different spectrums (e.g. is one LED a warm white LED and one LED a cold white LED, cf. Fig. 17, 19, 21a, para. 133-136 of EP1610593B1)?||20|
|5||Can the light of both LEDs be superimposed?||15|
|6||Do both LEDs comprise a blue stimulation source to pump a layer of a phosphor resulting in the emission of white light (phosphor does not refer to the chemical phosphor but rather to fluorescent material; creation of white light by superimposing red, green and blue LEDs does not meet the criteria)? (e.g. see para. 133)||15|
|7||Can the intensity of both LEDs be independently adjusted by a processor (e.g. they could be independently dimmable) to vary the resulting color temperature of the white light emitted by the device (e.g. if a more warm light is preferred, the intensity of the warm light LED is increased and/or the intensity of the cold light LED is decreased)?||30|
|8||Can the color temperature of the resulting white light be varied by a user interface coupled to a lighting fixture?||5|
Prior Art Search
This is a Prior Art Search contest aimed at determining if a patent idea was known and publicly available before a patent was filed.
+5 bonus points will be awarded for non-patent literature and for foreign language references as explained above.
This contest will close on Sunday, June 24th, 2018 at 11:59 PM PT.
Please review the Contest Rules. For more information on how to submit to this Contest type, please read the Intro to Prior Art Search page.
- All work must be original and prepared by a single author
- Maximum of one entry per person allowed
- Maximum length of 1,500 words
- Entries must be in English
- Ideas should be clearly expressed at a college-educated, non-expert level
- All submissions are subject to Patexia's contest legal terms
- Failure to follow these rules may lead to disqualification from the contest
- , "Developments of High-bright and Pure-white LED Lamps; K. Bando et al.; published in Journal of Light & Visual Environment Vol. 22; No. 1; 1998"""
- , Light Emitting Diodes: Research; Manufacturing; and Applications IV; Proceedings of SPIE; Vol. 3938; Sep 2000; p. 2-12; p. 30-41; p. 240-248
- , The IESNA Lighting Handbook; M. Rea; The Lighting Authority; Juli 2000; ISBN 0-87995-150-8
- , Rare earth phospors: fundamentals and applications; C. Ronda et al.; in: Journal of Alloys and Compounds 275-277 (1998); S. 669-676
- BRAINARD D H: COLORIMETRY US;NEW YORK; MCGRAW-HILL; PAGE(S) 2601-2654 XP002040706 ISBN: 0-07-047740-X