Patent ID: 8823614

Claim:
A method for generating a gray-scale voltage in a display device, the method comprising: displaying an image at a current luminance level; after displaying the image at the current luminance level, receiving a target luminance level different from the current luminance level; searching a reference voltage table containing gamma circuit control signals for a plurality of luminance levels for a gamma circuit control signal for the target luminance level and a gamma circuit control signal for at least one intermediate luminance level among a number of intermediate luminance levels between the current luminance level and the target luminance level; determining whether the number of intermediate luminance levels searched from the reference voltage table are not enough gray-scale voltage of the display device; determining, if the number of intermediate luminance levels are not enough, at least one additional intermediate luminance level by interpolating among the current luminance level, the intermediate luminance levels, and the target luminance level searched from the reference voltage table; generating a gamma circuit control signal corresponding to the at least one additional intermediate luminance level; and adjusting a luminance level by adjusting gray-scale voltages of the display device through a plurality of steps from the current luminance level to the target luminance level using the gamma circuit control signals found from the reference voltage table, and the gamma circuit control signal corresponds to the at least one additional intermediate luminance level, wherein the gamma circuit control signals are control signals for controlling voltage levels of the gray-scale voltages of the display device.