Abstract

A small backlight unit having four LEDs of different colors is designed and fabricated. Traditionally, the backlight units are lit by white cold cathode fluorescent lamps or by white LEDs. Our backlight unit utilizes four monochromatic LEDs. LEDs are located at corners of the light guide. Outcoupling is accomplished using large period blazed-gratings. The master plate for the light guide is fabricated by laser lithography. The final lightguide is UV-casted on a PMMA plate using an electroplated nickel tool. Proposed backlight unit enlarges significantly the gamut of LCD, if the color filters of the LCD panel have been chosen appropriately. The brightness uniformity and the white balance of the backlight are analyzed by a fiber spectrometer. The brightness uniformity of the backlight is good, over 85%. White balance of the backlight should be further improved.

© 2010 IEEE

Wide color gamut LCD with a quantum dot backlight

Zhenyue Luo, Yuan Chen, and Shin-Tson Wu
Opt. Express 21(22) 26269-26284 (2013)

Analysis of wide color gamut of green/red bilayered freestanding phosphor film-capped white LEDs for LCD backlight

Ji Hye Oh, Heejoon Kang, Minji Ko, and Young Rag Do
Opt. Express 23(15) A791-A804 (2015)

Color shift reduction of a multi-domain IPS-LCD using RGB-LED backlight

Ruibo Lu, Qi Hong, Zhibing Ge, and Shin-Tson Wu
Opt. Express 14(13) 6243-6252 (2006)

Zero-optical-distance mini-LED backlight with light-guiding microstructure lens for extra-thin, large-area notebook LCDs

Zhi Ting Ye, Yen Lung Chen, Chang Che Chiu, and Chia Chun Hu
Opt. Express 31(26) 43600-43614 (2023)

Large color gamut displays with diffraction gratings

Francesco Aieta, Peter Morovič, Ján Morovič, Marco Fiorentino, Charles Santori, and David Fattal
J. Opt. Soc. Am. A 33(6) 1133-1140 (2016)