US 6,636,207 B2 · Display driver IC

Abstract

The invention provides a first pair of bit lines BM and {overscore (BM)} that read data from a specified one of memory cells in a memory cell column, and a second pair of bit lines BS and {overscore (BS)} that write data in another specified one of the memory cells in the memory cell column include a display read line that successively reads out display data from the memory cell column. As viewed in a plan view, the display read line is disposed between the pair of bit lines BS and {overscore (BS)}. Potentials of signals that are transmitted through the pair of bit lines BS and {overscore (BS)} are in a mutually opposite relationship. Therefore, even when coupling capacitors are formed between the pair of bit lines BS and {overscore (BS)} and the display read line, the charges that are charged and discharged between the capacitances and the display read line are offset, and therefore the signal potential on the display read line does not deteriorate.

Claims6

Dependent claims

A display driver IC, comprising:

a plurality of memory cells arranged in a column direction;
a plurality of word lines arranged along a row direction, and capable of asynchronously selecting any two memory cells of the plurality of memory cells;
two pairs of bit lines extending along the column direction and commonly used by the plurality of memory cells, the two pairs of bit lines being connected to selected two memory cells of the plurality of memory cells;
a plurality of display word lines that successively select the plurality of memory cell along the column direction;
and
a display read line extending along the column direction and commonly used by the plurality of memory cells, the display read line being connected to one memory cell of the plurality of memory cells successively selected by the plurality of display word lines, such that, as viewed in a plan view, the display read line is disposed in one pair of bit lines of the two pairs of bit lines.

3 more elements

Dependencies are inferred from the claim text.

Display driver IC

Life of this patent

Display driver IC

Life of this patent

Abstract

Claims6