Driver having a storage device, electro-optical device using the driver, and electronic apparatus
AssigneeSeiko Epson Corporation
InventorShigeru Matsuyama
Life of this patent
Estimating the term…
Abstract
A display data RAM has a storage area and a pre-charging circuit section. The storage area has LCD bit lines to be used for reading out display data stored in memory cells. The pre-charging circuit section has pre-charging lines and preset lines. Pieces of information of a particular order bit among the display data stored in the memory cells can be read out by supplying a potential to a selected one of the pre-charging lines. As a result, the power consumption of the display driver can be reduced.
Claims6
A driver which has a storage device for storing display data and drives a display section based on the display data, wherein the storage device comprises:
- a plurality of memory cells;
- a plurality of first word lines, one of which is selected to write the display data to part of the memory cells;
- a plurality of second word lines paired with the respective first word lines, one of the second word lines being selected to readout the display data in part of the memory cells;
- a plurality of first bit lines to be used for writing the display data to part of the memory cells associated with a selected one of the first word lines;
- a plurality of second bit lines paired with the respective first bit lines and to be used for reading out the display data in part of the memory cells associated with a selected one of the second word lines;
- a pre-charging circuit which pre-charges the second bit lines;
- a plurality of first switching elements provided on pre-charging paths between the pre-charging circuit and the second bit lines;
- and
- a plurality of first control lines which controls on/off state of the first switching elements according to timing of reading out the display data stored in the respective memory cells.
Dependencies are inferred from the claim text.