18.1: Adaptive Dimming Technique with Optically Isolated Lamp Groups

An adaptive dimming technique is examined for an LCTV in which horizontally aligned eight parallel backlight lamps are provided. The lamps are optically isolated one another and can be dimmed independently depending on the TV signal. The optical isolations are found to be especially effective to relatively dark pictures having few bright spots. The backlight power for the sample pictures with APL ranging from 0.8% to 40% can be reduced to 20% − 65% by adopting the dimming technique.