Display driver
AssigneeSeiko Epson Corporation
InventorsDaishi Kondo, Gaku Numano
Life of this patent
Estimating the term…
Abstract
A display driver includes a line latch circuit; a first D/A conversion circuit; a second D/A conversion circuit; a first amplifier circuit configured to initialize charges of a capacitor of a first switched capacitor circuit in a first initialization period and output a data voltage in a first output period; a second amplifier circuit configured to initialize charges of a capacitor of a second switched capacitor circuit in a second initialization period and output a data voltage in a second output period; and a control circuit. The control circuit is configured to end the second initialization period of the second amplifier circuit before display data is latched by the line latch circuit at a latch timing and an output of the first amplifier circuit changes.
Claims7
A display driver, comprising:
- a line latch circuit configured to latch display data of one line;
- a first D/A conversion circuit configured to perform D/A conversion on the display data from the line latch circuit;
- a second D/A conversion circuit configured to perform D/A conversion on the display data from the line latch circuit;
- a first amplifier circuit which includes a first switched capacitor circuit and a first operational amplifier, and in which in a first initialization period, charges of a capacitor of the first switched capacitor circuit are initialized, and in a first output period, the first operational amplifier amplifies an output voltage of the first D/A conversion circuit based on the charges of the capacitor of the first switched capacitor circuit to output a data voltage;
- a second amplifier circuit which includes a second switched capacitor circuit and a second operational amplifier, and in which in a second initialization period, charges of a capacitor of the second switched capacitor circuit are initialized, and in a second output period, the second operational amplifier amplifies an output voltage of the second D/A conversion circuit based on the charges of the capacitor of the second switched capacitor circuit to output a data voltage;
- and
- a control circuit configured to control the line latch circuit, the first amplifier circuit, and the second amplifier circuit, wherein
- the control circuit is configured to end the second initialization period of the second amplifier circuit before the display data is latched by the line latch circuit at a latch timing and an output of the first amplifier circuit changes.
Dependencies are inferred from the claim text.