IP Library Granted Patent US 8,023,053
Granted Patent B2
US 8,023,053 · App. 12/066,327 · Granted Sep 20, 2011

Active-matrix liquid crystal matrix display

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Quick Facts
Patent No.
US 8,023,053
App. No.
12/066,327
Granted
Sep 20, 2011
Kind
B2
Abstract

In an active matrix for a liquid crystal display, including a plurality of pixel electrodes in an active zone, each of which can be addressed using one selection line among N selection lines and one data line among M data lines, a storage capacitor is connected to each pixel electrode in the matrix, and a line stabilization capacitor is provided for each selection line in the matrix. A first electrode of the stabilization capacitor is connected to the selection line and a second electrode is connected to a reference voltage. Such a structure may find application to active matrix type liquid crystal displays, particularly with integrated drivers.

Claims (21)

1. An active matrix for a liquid crystal display, comprising:

a plurality of pixel electrodes in an active zone, each of which can be addressed using one selection line among N selection lines and one data line among M data lines, the selection lines being selected in sequence by means of an integrated row driver; and

for each pixel electrode of the plurality of pixel electrodes,

a storage capacitor connected to the pixel electrode and to a selection line other than the selection line to address the pixel electrode, the storage capacitor being configured to supply additional capacitance to a liquid crystal capacitor associated with the pixel electrode,

wherein for each selection line a line stabilization capacitor is provided for limiting video disturbances, each line stabilization capacitor having a first electrode connected to the selection line at an output of the integrated row driver and a second electrode connected to a conducting bus having a reference voltage applied thereto.

2. An active matrix according to claim 1 , wherein the reference voltage is common to all stabilization capacitors in the matrix.

3. An active matrix according to claim 1 , wherein the stabilization capacitor is formed outside the active zone.

4. An active matrix according to claim 3 , wherein the stabilization capacitor for a selection line includes a plurality of elementary capacitors arranged in parallel.

5. An active matrix according to claim 3 , wherein the conducting bus intersects the selection lines and is separated from the selection lines by at least one insulating layer.

6. An active matrix according to claim 5 , wherein the conducting bus is made on or by an existing conducting plane of the matrix.

7. An active matrix according to claim 1 , wherein the stabilization capacitor in a selection line is formed in the active zone and is distributed along the selection line, equivalent to a plurality of elementary stabilization capacitors arranged in parallel, one per data line.

8. An active matrix according to claim 7 , wherein the second electrode in the stabilization capacitor of a selection line is formed by a conducting bus comprising at least parts facing selection lines separated from the level of these lines by at least one insulating level.

9. An active matrix according to claim 8 , wherein the conducting bus comprises a network of vertical conductors, parallel to the data lines.

10. An active matrix according to claim 9 , wherein the vertical conductors are made on one or more levels corresponding to the selection and/or data lines.

11. An active matrix according to claim 10 , wherein the conducting bus is made on or by an existing conducting plane of the matrix.

12. An active matrix according to claim 8 , wherein the conducting bus comprises a network of horizontal conductors, parallel to the selection lines.

13. An active matrix according to claim 12 , wherein the horizontal conductors are made on one or more levels corresponding to the selection and/or data lines.

14. An active matrix according to claim 8 , wherein the conducting bus is made by a conducting plane made above or below the selection and data lines and at a level separated from the level of these lines by at least one insulating level.

15. An active matrix according to claim 8 , wherein the conducting bus comprises parts facing pixel electrodes, on a level separated from the pixel electrodes by at least one insulating level so that an additional storage capacitor is formed with each pixel electrode.

16. A matrix type liquid crystal display comprising an active matrix according to claim 1 .

17. The active matrix according to claim 1 , wherein each line stabilization capacitor is set to a value which limits disturbances on the corresponding selection line to a level lower than a pitch of a scale of grey levels of the liquid crystal display.

Assignments (4)
CORRECTIVE ASSIGNMENT TO CORRECT THE RECEIVING PARTY NAME FROM INTERDIGITAL CE PATENT HOLDINGS TO INTERDIGITAL CE PATENT HOLDINGS, SAS. PREVIOUSLY RECORDED AT REEL: 47332 FRAME: 511. ASSIGNOR(S) HEREBY CONFIRMS THE ASSIGNMENT. Recorded Feb 28, 2024
From: THOMSON LICENSING
To: INTERDIGITAL CE PATENT HOLDINGS, SAS
Reel/Frame 066703/0509 →
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Oct 26, 2018
From: THOMSON LICENSING
To: INTERDIGITAL CE PATENT HOLDINGS
Reel/Frame 047332/0511 →
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Sep 1, 2017
From: THALES
To: THOMSON LICENSING
Reel/Frame 043468/0933 →
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Sep 2, 2008
From: KRETZ, THIERRY
To: THALES
Reel/Frame 021468/0671 →