Patent ID: 7098902
Filing Date: 2006-08-29
Classification: G09G

Abstract:
1. A display driver for driving a display panel, the display driver comprising: a control register including a correction parameter register which stores a correction parameter for correcting a contrast adjustment value that is instructed by a processing section; a computation circuit which adds a correction value specified by the correction parameter to the contrast adjustment value instructed by the processing section, and calculates a corrected contrast adjustment value; a drive circuit which drives a display panel at a drive voltage that is obtained based on the computed corrected contrast adjustment value; a memory control circuit which performs access control over a memory which is provided outside or inside the display driver and stores at least the correction parameter; and a register write circuit which writes the correction parameter that has been read from the memory to the correction parameter register at a given refresh timing and performs refresh processing of the correction parameter register, wherein the control register includes a first register group which stores a correction parameter and a second register group, the first register group being related to the refresh processing and being accessible by the processing section, and a second register group not being related to the refresh processing and being accessible by the processing section, wherein the correction parameter is read from the memory through the memory control circuit and is written to the first register group by the register write circuit at a refresh timing, and wherein the information from the processing section is wrote to the first register group in normal operation.