LED structure applied to backlight source
US9484505B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 29, 2014 |
| Grant date | Nov 1, 2016 |
| Priority date | — |
| Expiry date | Sep 23, 2034 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02B20/00
Abstract
An LED structure is applied to a backlight source to set a white light of a backlight module at a standard D65 position of the CIE1931 chromaticity coordinates and used together with a display module. A red phosphor for emitting a red light, a yellow phosphor for emitting a yellow light, and a blue light LED chip are provided. The mixing ratio of the red phosphor to the yellow phosphor is controlled within a range of (2.33−1):1, so that the original LED white light falls within a region enclosed by ccy≦1.8*ccx−0.12, ccy≧1.8*ccx−0.336, ccy≦0.33 and ccy≧0.15 of the CIE1931 coordinates. Since the red phosphor does not absorb or convert yellow light, the brightness loss of the yellow light that excites the yellow phosphor is minimized. A color filter may be installed to achieve better NTSC effect and luminous efficacy.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.