Patent ID: 7714832

Claim:
A method for generating a frame of an image on an LCD screen of a handheld wireless communications device having a plurality of light-sources, comprising: scanning a first region of contiguous lines of field sequentially driven liquid crystal pixels to produce a colour region on the LCD screen, using a source driver and a gate driver driven at a first frequency; and scanning a second region of contiguous lines of field sequentially driven liquid crystal pixels to produce a monochrome region on the LCD screen, using said source driver and said gate driver driven at a second frequency less than said first frequency, wherein said colour region is produced by scanning, in said frame, said first region a first number of times; and wherein said monochrome region is produced by scanning said second region a second number of times such that said first number of times is N times said second number of times, such that switching losses in said colour region is less than switching losses in said monochrome region; and activating said light sources during a portion of said frame.