Display driver IC
First Claim
1. A display driver IC, comprising:
- a plurality of memory cells arranged in a column direction and divided into a plurality of blocks, each block containing a specified number of memory cells;
a plurality of display word lines that successively select the plurality of memory cells in the column direction;
a main read line commonly shared by the plurality of memory cells, which transfers display data read from each one of the memory cells that are successively selected by the plurality of display word lines;
a plurality of sub-read lines, one for each column-block of memory cells for transferring display data read from each one of the memory cells in that column-block;
a plurality of main switches, one for each column-block for selectively connecting a corresponding one of the sub-read lines to the main read line; and
a plurality of sub-switches, one for each of the plurality of memory cells, and selected by a respective one of the display word lines to thereby connect that memory cell to a corresponding one of the sub-read lines.
2 Assignments
0 Petitions
Accused Products
Abstract
A display driver IC with a built-in RAM that can restrain an increase in its power consumption even when the total number of memories in the column direction increases. Such a display driver IC has a main read line that is commonly used by memory cells in the same column arranged along a column direction and transmits display data that is read from successively selected memory cells. The memory cells are divided at a specified number thereof in the column direction to form blocks. Each of the column-blocks is provided with a sub-read line, and display data read from one of the memory cells in each of the blocks is transferred through the corresponding sub-read line. A main switch is provided to selectively connect a corresponding one of the sub-read lines to the main read line. Each of the memory cells is provided with a sub-switch that selectively connects to a corresponding sub-read line.
-
Citations
11 Claims
-
1. A display driver IC, comprising:
-
a plurality of memory cells arranged in a column direction and divided into a plurality of blocks, each block containing a specified number of memory cells;
a plurality of display word lines that successively select the plurality of memory cells in the column direction;
a main read line commonly shared by the plurality of memory cells, which transfers display data read from each one of the memory cells that are successively selected by the plurality of display word lines;
a plurality of sub-read lines, one for each column-block of memory cells for transferring display data read from each one of the memory cells in that column-block;
a plurality of main switches, one for each column-block for selectively connecting a corresponding one of the sub-read lines to the main read line; and
a plurality of sub-switches, one for each of the plurality of memory cells, and selected by a respective one of the display word lines to thereby connect that memory cell to a corresponding one of the sub-read lines. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
-
Specification