Display driving device
AssigneeOki Semiconductor Co., Ltd.
InventorYuichi Nakanishi
Life of this patent
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Abstract
The amount of communication with an external MCU can be reduced to reduce power consumption, and reduced power consumption and reduced cost can also be anticipated in the external MCU. An MCU first transmits old image data and new image data from image memory to a register by serial communication without modifying the data and with substantially no computational processing thereof. Combinations of waveform data necessary for displaying a color is then stored in a waveform latch circuit from a waveform data shift register and a combination of waveform data is selectively outputted by each of a group of 4-to-1 selectors. Data transmission from the external MCU from the waveform data shift register to the waveform latch circuit is thereby restricted to the initial stage.
Claims7
A display driving device for driving a display panel in which waveform data are determined from the relationship between old display data and new display data;
- said display driving device comprising:
- a first circuit for storing said new display data presented from an external source and outputting a first selection control signal that is generated based on said new display data;
- a second circuit for storing said old display data presented from an external source and outputting a second selection control signal that is generated based on said old display data;
- a waveform latch circuit for outputting said waveform data determined from the relationship between said old display data and new display data;
- a selector for selecting and outputting selected one of said waveform data on the basis of said first and second control signals;
- and
- a drive circuit for generating drive voltages in accordance with said selected waveform data and supplying said drive voltages to said display panel.
Dependencies are inferred from the claim text.