An LED light propagation cavity with staggered light bars for eliminating the Hot Spot

IF 2.2 3区物理与天体物理 Q2 OPTICS Optics Communications Pub Date : 2024-09-21 DOI:10.1016/j.optcom.2024.131138

Yingyi Qiu , Yun Ye , Hongxing Xie , Peihui Chen , Kuanhuang Liu , Enguo Chen , Sheng Xu , Tailiang Guo , Fugen Luo

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Abstract

The light source of traditional edge-lit backlight modules typically consists of LED bars which composed of multiple LED chips. However, the spacing between the chips can create distinct bright and dark spots (Hot Spot) on the input surface of the light guide plate (LGP), thereby affecting the optical performance of the backlight module. In this paper, we proposed an edge-lit backlight module with staggered light bars, incorporating a light propagation cavity design to enhance light receiving efficiency and eliminate Hot Spot. Firstly, we designed the structure of the staggered light bars and the light propagation cavity. Secondly, the advantages of the new backlight module design in eliminating Hot Spot were verified through TracePro simulations. The simulation results showed that the maximum irradiance of the backlight module reached 81,010 W/m², and the luminance uniformity peaked at 75.142 %. Compared to the traditional backlight modules, the light receiving efficiency was increased by 6.62 %, and the luminance uniformity was improved by 1.34 times, which effectively mitigated the Hot Spot. Finally, we discussed the impact of the improved backlight module in reducing the thickness of the LGP and decreasing the number of LED chips, achieved superior optical performance. This study demonstrates the significant advantages of the light propagation cavity in eliminating Hot Spot within backlight modules.

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带交错光条的 LED 光传播腔可消除热点

传统的边缘发光背光模块的光源通常由多个 LED 芯片组成的 LED 条构成。然而，芯片之间的间距会在导光板（LGP）的输入面上产生明显的亮点和暗点（热点），从而影响背光模块的光学性能。在本文中，我们提出了一种交错光条的边缘发光背光模块，并结合了光传播腔设计，以提高受光效率并消除热点。首先，我们设计了交错光条和光传播腔的结构。其次，通过 TracePro 仿真验证了新背光模块设计在消除热点方面的优势。仿真结果显示，背光模块的最大辐照度达到 81010 W/m2，亮度均匀性峰值为 75.142 %。与传统背光模块相比，受光效率提高了 6.62%，亮度均匀性提高了 1.34 倍，有效缓解了热点问题。最后，我们讨论了改进型背光模组在降低 LGP 厚度和减少 LED 芯片数量方面的影响，实现了卓越的光学性能。这项研究证明了光传播腔在消除背光模块热点方面的显著优势。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Optics Communications 物理-光学

CiteScore

5.10

自引率

8.30%

发文量

681

审稿时长

38 days

期刊介绍： Optics Communications invites original and timely contributions containing new results in various fields of optics and photonics. The journal considers theoretical and experimental research in areas ranging from the fundamental properties of light to technological applications. Topics covered include classical and quantum optics, optical physics and light-matter interactions, lasers, imaging, guided-wave optics and optical information processing. Manuscripts should offer clear evidence of novelty and significance. Papers concentrating on mathematical and computational issues, with limited connection to optics, are not suitable for publication in the Journal. Similarly, small technical advances, or papers concerned only with engineering applications or issues of materials science fall outside the journal scope.