IP Library Granted Patent US 7,609,247
Granted Patent B2
US 7,609,247 · App. 11/399,673 · Granted Oct 27, 2009

Driving circuit for liquid crystal display device, liquid crystal display device, method of driving liquid crystal display device, and electronic apparatus

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Quick Facts
Patent No.
US 7,609,247
App. No.
11/399,673
Granted
Oct 27, 2009
Kind
B2
Abstract

A driving circuit includes a scanning-line driving circuit applying an on potential to sequentially drive scanning-lines, a data-line driving circuit that, when the on potential is applied to each scanning-line, turns each data-line potential to a potential difference corresponding to a density based on a counter electrode potential and a potential corresponding to the same writing polarity among the scanning-lines, and a storage capacitor driving circuit which, when the on potential is applied to the scanning-lines and the data-line potential corresponds to positive polarity writing, shifts the other storage capacitor electrode potential in each storage capacitor to a high level after an off potential is applied to the scanning-lines, and, when the on potential is applied to the scanning-lines and the data-line potential corresponds to negative polarity writing, shifts the other storage capacitor electrode potential to a low level after the off potential is applied to the scanning-lines.

Claims (15)

1. A driving circuit for a liquid crystal display device, which has adjacent scanning line groups each having a plurality of scanning lines, data lines, liquid crystal capacitors correspondingly provided intersections between the plurality of scanning lines and the data lines with liquid crystal interposed between a counter electrode and pixel electrodes, switching elements interposed between the data lines and the pixel electrodes, the switching elements being turned on when an on potential is applied to the scanning lines and being turned off when an off potential is applied to the scanning lines, and storage capacitors each having one storage capacitor electrode connected to the corresponding pixel electrode and the other storage capacitor electrode disposed to face one storage capacitor electrode, the driving circuit for a liquid crystal display device comprising:

a scanning line driving circuit that applies the on potential to the plurality of scanning lines so as to sequentially drive the plurality of scanning lines;

a data line driving circuit that, when the on potential is applied to each of the plurality of scanning lines by the scanning line driving circuit, turns the potentials of the data lines to a potential difference according to a density on the basis of a potential of the counter electrode and the potentials corresponding to the same writing polarity among the scanning lines belonging to each of the groups of scanning lines; and

a storage capacitor driving circuit which, when the on potential is applied to the scanning lines in the scanning line groups and the potential of the data line corresponds to positive polarity writing, simultaneously provides a first potential, which shifts a potential of the other storage capacitor electrode in each of the storage capacitors to a high level after the off potential is applied to all of the scanning lines in one of the scanning line groups, to the other storage capacitor electrode corresponding to all of the scanning lines in the one of the scanning line groups, and, when the on potential is applied to the scanning lines and the potential of the data line corresponds to negative polarity writing, simultaneously provides the second potential, which shifts the potential of the other storage capacitor electrode in each of the storage capacitors to a low level after the off potential is applied to all of the scanning lines in the one of the scanning line groups, to the other storage capacitor electrode which corresponds to all of the scanning lines in the one of the scanning line groups.

2. The driving circuit for a liquid crystal display device according to claim 1 ,

wherein the number of adjacent scanning lines belonging to each of the scanning line groups is two, and

the data line driving circuit inverts the writing polarities of the data lines for every two horizontal scanning periods.

3. The driving circuit for a liquid crystal display device according to claim 1 ,

wherein the data line driving circuit turns the potential of the data line to a potential corresponding to a different writing polarity between adjacent scanning line groups.

4. A liquid crystal display device comprising the driving circuit for a liquid crystal display device according to claim 1 .

5. An electronic apparatus comprising the liquid crystal display device according to claim 4 .

6. A method of driving a liquid crystal display device, which has adjacent scanning line groups each having a plurality of scanning lines, data lines, liquid crystal capacitors correspondingly provided intersections between the plurality of scanning lines and the data lines with liquid crystal interposed between a counter electrode and pixel electrodes, switching elements interposed between the data lines and the pixel electrodes, the switching elements being turned on when an on potential is applied to the scanning lines and being turned off when an off potential is applied to the scanning lines, and storage capacitors each having one storage capacitor electrode connected to the corresponding pixel electrode and the other storage capacitor electrode disposed to face one storage capacitor electrode, the method comprising:

sequentially applying the on potential to the plurality of scanning lines;

when the on potential is applied to each of the plurality of scanning lines, turning the potentials of the data lines to a potential difference according to a density on the basis of a potential of the counter electrode and the potentials corresponding to the same writing polarity among the scanning lines belonging to each of the scanning line groups; and

when the on potential is applied to the scanning lines in the scanning line groups and the potential of the data line corresponds to positive polarity writing, simultaneously shifting a potential of the other storage capacitor electrode corresponding to all of the scanning lines in one of the scanning line groups in each of the storage capacitors to a high level after the off potential is applied to all of the scanning lines in the one of the scanning line groups, and, when the on potential is applied to the scanning lines in the one of the scanning line groups and the potential of the data line corresponds to negative polarity writing, simultaneously shifting the potential of the other storage capacitor electrode which corresponds to all of the scanning lines in the one of the scanning line groups in each of the storage capacitors to a low level after the off potential is applied to all of the scanning lines in the one of the scanning line groups.

Assignments (1)
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Oct 8, 2013
From: SONY CORPORATION
To: JAPAN DISPLAY WEST INC.
Reel/Frame 031377/0894 →