A field-sequential-color display with a local-primary-desaturation backlight scheme

Abstract

Field-sequential-color technology eliminates the need for color filters in liquid-crystal displays (LCDs) and results in significant power savings and higher resolution. But the LCD suffers from color breakup, which degrades image quality and limits practical applications. By controlling the backlight temporally and spatially, a so-called local-primary-desaturation (LPD) backlight scheme was developed and implemented in a 180-Hz optically compensated bend (OCB) mode LCD equipped with a backlight consisting of a matrix of light-emitting diodes (LEDs). It restores image quality by suppressing color breakup and saves power because it has no color filter and uses local dimming. A perceptual experiment was implemented for verification, and the results showed that a field-sequential-color display with a local-primary-desaturation backlight reduced the color breakup from very annoying to not annoying and even invisible.