Research and design of direct-type LED backlight lens

Qianqian Su

doi:10.1117/12.2674055

9 March 2023 Research and design of direct-type LED backlight lens

Qianqian Su

Proceedings Volume 12600, International Conference on Optoelectronic Materials and Devices (ICOMD 2022); 1260018 (2023) https://doi.org/10.1117/12.2674055
Event: 2022 International Conference on Optoelectronic Materials and Devices, 2022, Chongqing, China

Abstract

The direct type backlight module diffuses the light emitted by the LED device uniformly in the largest possible range through the lens, and forms a uniform brightness emission on the illuminated surface through the overlap of these light spots. However, in actual use, after the light emitted by the light source is diffused by the lens, since the light is concentrated near the center of the light source, sometimes the phenomenon of the central bright spot cannot be completely eliminated, which is not conducive to backlighting. This paper analyzes the matching of LED light source and lens through experiments and simulations. The research shows that the size of the LED light-emitting area and the relative position of the LED light-emitting surface and the bottom surface of the lens have a greater impact on the spot shape and illuminance distribution of the receiving surface, and there will be more obvious brightness. Undesirable phenomena such as dark circles, uneven diffusion, and asymmetry of light spots. Combined with the analysis of the microstructure design on the bottom surface of the lens, it can be seen that the application of microstructures can reduce the excessive brightness directly above the LED and play a certain mitigation and improvement effect. The hemispherical and beveled right-angled triangular ring microstructures can prevent the center from focusing and appear strange point phenomenon.

Citation Download Citation

Qianqian Su "Research and design of direct-type LED backlight lens", Proc. SPIE 12600, International Conference on Optoelectronic Materials and Devices (ICOMD 2022), 1260018 (9 March 2023); https://doi.org/10.1117/12.2674055

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