Patent ID: 8334834

Claim:
A backlight control system, comprising: a backlight that emits light to a display panel; and an overdrive device that modifies a backlight duty signal according to a current-frame backlight duty signal and a previous-frame backlight duty signal, therefore increasing response time of the backlight driven by the modified backlight duty signal; wherein the overdrive device compares a duty value of the current-frame backlight duty signal with a duty value of the previous-frame backlight duty signal; wherein when the duty value of the previous-frame backlight duty signal is smaller than the duty value of the current-frame backlight duty signal, the modified backlight duty signal is generated with a magnitude greater than that of the current-frame backlight duty signal and applied to the backlight; wherein when the duty value of the previous-frame backlight duty signal is greater than the duty value of the current-frame backlight duty signal, the modified backlight duty signal is generated with a magnitude smaller than that of the current-frame backlight duty signal and applied to the backlight; and wherein when the duty value of the previous-frame backlight duty signal is about equal to the duty value of the current-frame backlight duty signal, the modified backlight duty signal is generated with a magnitude about equal to that of the current-frame backlight duty signal and applied to the backlight.