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
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