发明名称 |
LED lens, back light module and liquid crystal display device |
摘要 |
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 ⁢ ⁢ ⅆ 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.
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申请公布号 |
US8567979(B2) |
申请公布日期 |
2013.10.29 |
申请号 |
US201113322543 |
申请日期 |
2011.10.25 |
申请人 |
CHANG KUANG-YAO;HE HU;SHENZHEN CHINA STAR OPTOELECTRONICS TECHNOLOGY CO., LTD. |
发明人 |
CHANG KUANG-YAO;HE HU |
分类号 |
G09F13/04 |
主分类号 |
G09F13/04 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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