Patent ID: 7839370

Claim:
A display panel driver comprising: a grayscale voltage generator configured to develop a set of different grayscale voltages corresponding to grayscale levels of pixels within a display panel; and a plurality of grayscale selector driver circuits each of which is responsive to pixel data to select one of said grayscale voltages, and to provide a drive voltage corresponding to said selected one of said grayscale voltages for a selected pixel within said display panel, said grayscale selector driver circuits each comprising an amplifier and first and second switches, said first switch connecting an output of said amplifier to said selected pixel within said display panel, and said second switch connecting said one of said grayscale voltages to said selected pixel within said display panel, wherein said grayscale voltage generator is allowed to output said set of grayscale voltages during a first period within a horizontal period, and prohibited from outputting said set of grayscale voltages during a second period within said horizontal period, wherein said grayscale voltage generator includes: first serially-connected resistors for generating different voltages through voltage dividing; a set of amplifiers receiving said different voltages, respectively, and developing a set of bias voltages through voltage follower operation; second serially-connected resistors receiving said bias voltages on nodes thereof and developing said set of grayscale voltages through voltage dividing; a third switch for feeding a power supply voltage to said first serially-connected resistors, and wherein said grayscale voltage generator stops outputting said set of grayscale voltages through turning off said third switch, and placing outputs of said amplifiers into a high-impedance state.