Brightness management in a direct LED backlight for LCD TVs

Ching Cherng Sun; Ivan Moreno; Shih Hsun Chung; Wei Ting Chien; Chih To Hsieh; Tsung Hsun Yang

doi:10.1889/1.2905036

Brightness management in a direct LED backlight for LCD TVs

Ching Cherng Sun, Ivan Moreno, Shih Hsun Chung, Wei Ting Chien, Chih To Hsieh, Tsung Hsun Yang

Research output: Contribution to journal › Article › peer-review

32 Scopus citations

Abstract

A method of calculating the luminance and luminance uniformity of a bottom LED backlight is proposed and demonstrated. Both the power consumption and brightness uniformity as a function of screen brightness, screen size, backlight thickness, transmittance of the LCD panel, reflective cavity efficiency, gain, cone angle of the enhancement films, LED array configuration, and the average luminous flux, radiation pattern, and input power of individual LEDs. Moreover, a 42-in. LCD TV using this backlight design approach was fabricated. 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. The brightness uniformity can be predicted within an accuracy of 94% and the luminance level within an accuracy of 96%.

Original language	English
Pages (from-to)	519-526
Number of pages	8
Journal	Journal of the Society for Information Display
Volume	16
Issue number	4
DOIs	https://doi.org/10.1889/1.2905036
State	Published - Apr 2008

Keywords

Light-emitting diodes
Optical engineering

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10.1889/1.2905036

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abstract = "A method of calculating the luminance and luminance uniformity of a bottom LED backlight is proposed and demonstrated. Both the power consumption and brightness uniformity as a function of screen brightness, screen size, backlight thickness, transmittance of the LCD panel, reflective cavity efficiency, gain, cone angle of the enhancement films, LED array configuration, and the average luminous flux, radiation pattern, and input power of individual LEDs. Moreover, a 42-in. LCD TV using this backlight design approach was fabricated. 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. The brightness uniformity can be predicted within an accuracy of 94% and the luminance level within an accuracy of 96%.",

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AU - Sun, Ching Cherng

AU - Moreno, Ivan

AU - Chung, Shih Hsun

AU - Chien, Wei Ting

AU - Hsieh, Chih To

AU - Yang, Tsung Hsun

PY - 2008/4

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N2 - A method of calculating the luminance and luminance uniformity of a bottom LED backlight is proposed and demonstrated. Both the power consumption and brightness uniformity as a function of screen brightness, screen size, backlight thickness, transmittance of the LCD panel, reflective cavity efficiency, gain, cone angle of the enhancement films, LED array configuration, and the average luminous flux, radiation pattern, and input power of individual LEDs. Moreover, a 42-in. LCD TV using this backlight design approach was fabricated. 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. The brightness uniformity can be predicted within an accuracy of 94% and the luminance level within an accuracy of 96%.

AB - A method of calculating the luminance and luminance uniformity of a bottom LED backlight is proposed and demonstrated. Both the power consumption and brightness uniformity as a function of screen brightness, screen size, backlight thickness, transmittance of the LCD panel, reflective cavity efficiency, gain, cone angle of the enhancement films, LED array configuration, and the average luminous flux, radiation pattern, and input power of individual LEDs. Moreover, a 42-in. LCD TV using this backlight design approach was fabricated. 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. The brightness uniformity can be predicted within an accuracy of 94% and the luminance level within an accuracy of 96%.

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Brightness management in a direct LED backlight for LCD TVs

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Keywords

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