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AssigneeShenzhen China Star Optoelectronics Technology Co., Ltd.
InventorsKuang-Yao Chang, Hu He
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The present invention discloses a light emitting diode (LED) lens, a back light module and a liquid crystal display (LCD) device. A LED lens is of a direct type back light module; the dispersion index of said LED lens is less than 0.1; said dispersion index is: k dispersion = ∫ A ∑ i d i d total A ; dA is a microfacet of the main luminous surface of the LED blue chip; di is a solid angle of the incident angle which is just in the critical area when dA light is reflected to the lens; the critical area refers to an area in which light with different wavelengths emitted by the LED is dispersed in the lens; the total solid angle of color separation corresponding to microfacet dA is: ∑ i d i ; dtotal is the solid angle of the lens light emergent surface corresponding to any microfacet. The present invention can avoid dispersion phenomenon under the condition of guaranteeing wide luminance.
1, A light emitting diode (LED) lens of a direct type back light module, the dispersion index of said LED lens is less than 0.1;
2, The LED lens of the direct type back light module of claim 1, wherein the main luminous surface of the LED blue chip is a luminous surface facing the lens.
3, The LED lens of the direct type back light module of claim 1, wherein the main luminous surface of the LED blue chip is the largest luminous surface.
4, The LED lens of the direct type back light module of claim 1, wherein said critical area is an area (between minimum −0.3o and maximum +0.3o) which is determined on the basis that the critical angle range (minimum, maximum) of total reflection is calculated in accordance with the peak value of the light reflected to the LED lens.
5, The LED lens of the direct type back light module of claim 1, wherein said lens is made of organosilicon material;
6, A direct type back light module, comprising the LED lens of the direct type back light module of claim 1;
7, The direct type back light module of claim 6, wherein the main luminous surface of said LED blue chip is a luminous surface facing the lens.
8, The direct type back light module of claim 6, wherein the main luminous surface of said LED blue chip is the largest luminous surface.
9, The direct type back light module of claim 6, wherein said critical area is an area (between minimum −0.3o and maximum +0.3o) which is determined on the basis that the critical angle range (minimum, maximum) of total reflection is calculated in accordance with the peak value of the light reflected to the LED lens.
10, The direct type back light module of claim 6, wherein said lens is made of organosilicon material;
11, The direct type back light module of claim 6, wherein each column of LEDs of said back light module are fixed on one printed circuit board (PCB).
12, The direct type back light module of claim 7, wherein each column of LEDs of said back light module are fixed on one PCB.
13, The direct type back light module of claim 8, wherein each column of LEDs of said back light module are fixed on one PCB.
14, The direct type back light module of claim 9, wherein each column of LEDs of said back light module are fixed on one PCB.
15, The direct type back light module of claim 10, wherein each column of LEDs of said back light module are fixed on one PCB.
16, A liquid crystal display (LCD) device, comprising:
17, The LCD device of claim 16, wherein the main luminous surface of said LED blue chip is a luminous surface facing the lens.
18, The LCD device of claim 16, wherein the main luminous surface of said LED blue chip is the largest luminous surface.
19, The LCD device of claim 16, wherein said critical area is an area (between minimum −0.3o and maximum +0.3o) which is determined on the basis that the critical angle range (minimum, maximum) of total reflection is calculated in accordance with the peak value of the light reflected to the LED lens.
20, The LCD device of claim 16, wherein said lens is made of organosilicon material;