A display system uses a weighted PWM scheme to deliver control during a frame time for developing a plurality of grayscale levels in each of a plurality of pixels. Of all the weighted subframes, a predetermined number of the shortest subframes utilize a like subframe duration. However, to provide...http://www.google.com.au/patents/US5798743?utm_source=gb-gplus-sharePatent US5798743 - Clear-behind matrix addressing for display systems
