Patent ID: 8207928

Claim:
Active matrix display device ( 6 ) comprising: a display ( 2 ) with a plurality of display pixels ( 3 ); a data input ( 10 ) for receiving a data signal; a controller ( 7 ) for distributing said data signal over said display pixels ( 3 ) to generate an image on said display ( 2 ) with an overall brightness level, during at least one frame period (F), wherein said device ( 6 ) is adapted to: divide said frame period (F) into only a first subperiod and an adjacent second subperiod for at least one subset (S) of said display pixels ( 3 ) such that said display pixels ( 3 ) of said at least one subset (S) have at least a light output (L) at a first non-zero brightness level (L 1 ) for a duration of the first sub-period (F 1 ) of said frame period (F) and at a second non-zero brightness level (L 2 ) for a duration of the second sub-period (F 2 ) of said frame period (F), wherein the first and second levels of brightness are selected so that the time averaged sum of said brightness levels (L 1 ,L 2 ) of said pixels within said at least one subset (S) is substantially equal to said overall brightness level of said image in said at least one subset (S), said second level being maintained a stable level during the second sub period and the first and second levels being in a known ratio.