Patent ID: 7719550

Claim:
A method for deciding a control voltage of a monitor, said control voltage being relative to a maximum luminosity of the monitor, the monitor being used for displaying a target image adjacent to N adjacent images in a video stream, N being a positive integer, the target image and each of the N adjacent images respectively having a maximum gray level, the target image comprising a plurality of target pixels, each of the target pixels having a target gray level, the monitor being capable of displaying M default gray levels, M being a positive integer, said method comprising the steps of: selectively generating a reference gray level (R) for the target image based on the maximum gray levels; selecting a target control voltage corresponding to the reference gray level (R) from a look-up table; generating a gain based on the reference gray level (R) and M; respectively multiplying each of the target gray levels by said gain to generate a plurality of new gray levels for the target pixels in the target image; and setting the target control voltage as the control voltage of the monitor and displaying the target image with the new gray levels on the monitor.