Patent ID: 7545368
Filing Date: 2009-06-09
Classification: G09G

Abstract:
1. A display controller that supplies display data to a data driver driving a plurality of scan lines of a display panel based on the display data, the display controller comprising: a frame memory that stores the display data for at least one vertical scan period, the display data being supplied from a host; an interrupt output cycle setting register, an output cycle of an interrupt signal to be output to the host being set in units of one vertical scan period in the interrupt output cycle setting register; an interrupt output setting register that selects whether to pulse-output or level-output the interrupt signal; and an interrupt signal generation section generating a first interrupt signal having pulses in the output cycle set in the interrupt output cycle setting register, the interrupt signal generation section generating a second interrupt signal which is set active when the output cycle set in the interrupt output cycle setting register has elapsed from a preceding active change timing and is set to inactive by the host, and the interrupt signal generation section outputting the first or second interrupt signal to the host as the interrupt signal based on a value set in the interrupt output setting register, the display controller storing the display data supplied from the host corresponding to the interrupt signal in the frame memory, the display controller reading the display data from the frame memory in a predetermined read cycle, and the display controller supplying the display data to the data driver.