Direct LED backlight for large area LCD TVs: brightness analysis
Direct LED backlight for large area LCD TVs: brightness analysis
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DOI：
10.1117/12.735508
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发表时间：
2007-09
期刊：
影响因子：
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通讯作者：
Ching-Cherng Sun;Ivan Moreno;S. Chung;W. Chien;C. Hsieh;Tsung-Hsun Yang
中科院分区：
文献类型：
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作者：
Ching-Cherng Sun;Ivan Moreno;S. Chung;W. Chien;C. Hsieh;Tsung-Hsun Yang
直接或底部LED背光是大面积LCD显示器中的关键概念，因为它不使用光导，是平坦的，并且易于组装。在本文中，提出并演示了一种用于底部LED背光的亮度管理方法。我们分析计算了功耗和亮度均匀性的函数：屏幕亮度，屏幕尺寸，背光厚度，液晶面板的透射率，反射腔效率，增益和锥角的增强膜，LED阵列的配置，以及平均光通量和辐射模式的单个LED。此外，一个42英寸的液晶电视与这种背光设计方法的制作和演示。底部背光采用RGGB 4合1多芯片LED阵列，位于扩散器和双亮度增强膜后面的高反射盒内。我们预测的准确度为94%的亮度均匀性和96%的亮度水平。
A direct or bottom LED backlight is a key concept in large area LCD displays because it does not use a light guide, is flat, and is easy to assemble. In this paper, a method of luminance management for a bottom LED backlight is proposed and demonstrated. We analytically calculate both the power consumption and brightness uniformity in function of: screen brightness, screen size, backlight thickness, transmittance of the LCD panel, reflective cavity efficiency, gain and cone angle of enhancement films, LED array configuration, and the average luminous flux and radiation pattern of a single LED. Moreover, a 42-inch LCD television with this backlight design approach is made and demonstrated. The bottom backlight incorporates an array of RGGB 4-in-1 multi-chip LEDs within a highly reflective box behind a diffuser and a dual brightness enhancement film. We predict with an accuracy of 94% the brightness uniformity and with 96% the luminance level.