Patent ID: 8068087

Claim:
A method for determining a display backlight modulation process, said method comprising: a) performing motion detection on at least a portion of a first frame of a video sequence to determine whether substantial motion occurs in said portion of said first frame; b) performing motion detection on a corresponding portion of a second frame of said sequence to determine whether substantial motion occurs in said corresponding portion of said second frame; c) using a first pulse-width-modulated (PWM) backlight modulation screen comprising at least one fixed-width pulse at a first width and a first spacing for said first frame; d) if substantial motion is detected in one of said first frame and said second frame, but not the other of said first frame and said second frame, using a transition backlight modulation screen for displaying said second frame with a display device, wherein said transition backlight modulation screen comprises pulse widths determined by: Δ ⁢ ⁢ T 1 ⁡ ( i , j ) = ( 1 - m ⁢ ⁢ Map ⁡ ( i , j ) N ) ⁢ Δ ⁢ ⁢ T 2 Δ ⁢ ⁢ T 2 ⁡ ( i , j ) = ( 1 + m ⁢ ⁢ Map ⁡ ( i , j ) N ) ⁢ Δ ⁢ ⁢ T 2 wherein mMap(i,j) is said motion map variable, ΔT 1 is a first pulse width, ΔT 2 is a second pulse width, ΔT is a total pulse width time, and N is the number of transition frames.