| 摘要 |
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. |
| 主权项 |
1. A light emitting diode (LED) structure applied to a backlight source, comprising:
a base; a blue light LED chip, mounted onto the base; a red phosphor that absorbs a blue light emitted from the blue light LED chip to emit a red light; a yellow phosphor that absorbs the blue light emitted from the blue light LED chip to emit a yellow light; and an encapsulation, for packaging the blue light LED chip, the red phosphor and the yellow phosphor; wherein the red light emitted by the red phosphor is a light having wavelength of 630 nm and a half-wave width of dominant wavelength less than 10 nm, and the red phosphor has a chemical formula of T2XF6:Mn4+, and T is any one selected from a group consisting of Li, Na, K, and Rb, and X is any one selected from a group consisting of Ge, Si, Sn, Zr, and Ti; characterized in that the yellow light emitted by the yellow phosphor has wavelength of 540 nm-550 nm; wherein a mixing ratio of the yellow phosphor to the red phosphor is within a range of (2.33−1):1, so that the blue light emitted from the blue light LED chip, the red light emitted from the red phosphor, and the yellow light emitted from the yellow phosphor may be mixed to form a white light falling within an area enclosed by ccy≦1.8*ccx−0.12, ccy≧1.8*ccx−0.336, ccy≦0.33 and ccy≧0.15 of a CIE 1931 chromaticity coordinates, wherein ccx represents the X-axis of the CIE 1931 chromaticity coordinates; ccy represents the Y-axis of the CIE 1931 chromaticity coordinates. |
