Patent ID: 7209150

Claim:
A mobile device, comprising: a user contrast setting stored in a memory device, wherein the user contrast setting is selected from a range of user contrast settings; a processor having an operating system configured to retrieve the user contrast setting from the memory device, convert the user contrast setting into a hardware contrast setting, and save the hardware contrast setting to a memory location; a display driver that retrieves the hardware contrast setting from the memory location and generates a contrast voltage as a function of the hardware contrast setting; and a display coupled to the contrast voltage and having a variable contrast ratio, wherein the variable contrast ratio of the display is controlled by the contrast voltage; wherein the processor limits the user contrast setting to a usable range corresponding to a usable range of the contrast voltages, the usable range of the contrast voltages being narrower than a full range of contrast voltages that the driver is configured to be capable of generating to control the contrast ratio.