Integrated amorphous silicon color sensor on TFT LCD

In this paper, we present the feasibility of an optical color sensing feedback system for an LED (light emitting diode) backlight by integrating the amorphous silicon color sensor onto the LCD panel. To improve the photoconductivity degradation of amorphous silicon, a new LASER immersion treatment has been applied. The integrated color sensor optical feedback controlled LED backlighting system improved the color variation to less than 0.008 /spl Delta/u'v' (CIE1976) compared with 0.025 for an open loop system over the temperature range of 42/spl deg/C to 76/spl deg/C.