Patent ID: 8144107

Claim:
Method for improving the visual perception of an image displayed on a liquid crystal screen, said method comprising at least steps for: generating an effective adjusting signal (P E,i+1 ) of a rear-lighting lamp depending on the value of a target power value (P T ) of said rear-lighting lamp; and generating an effective image contrast control signal (C E,i+1 ) depending on said effective adjusting signal of the rear-lighting lamp, so as to, increase, respectively decrease, the contrast of the image displayed on said screen as said effective adjusting signal (P E,i+1 ) of the rear-lighting lamp decreases, respectively increases; wherein said target power value (P T ) of said rear-lighting lamp is calculated as a function of the average of the mean luminances (S i /2 N ) of a predetermined plurality of previous image frames if the distance (d i ) between the mean luminance (y i ) of a current image frame (H) and the average of the mean luminances (S i /2 N ) of said predetermined plurality of previous image frames is less or equal to a threshold value (t L ), otherwise said target power value (P T ) of said rear-lighting lamp is calculated as a function of the mean luminance (y i ) of said current image frame (H) and the mean luminance of said predetermined plurality of previous image frames is initialized to the mean luminance (y i ) of the current image frame (H).