Display device

• US 20030025661A1
• Filed: 07/30/2002
• Published: 02/06/2003
• Est. Priority Date: 08/01/2001
• Status: Abandoned Application

• Current Assignee: Koninklijke Philips Electronics N.V. (Koninklijke Philips N.V.)
• Original Assignee: Koninklijke Philips Electronics N.V. (Koninklijke Philips N.V.)
• Inventors: Johnson, Mark Thomas, Stallinga, Sjoerd, Karman, Gerardus Petrus
• Application Number:
  US10/208,679
• Publication Number:
  US 20030025661A1
• Time in Patent Office: Days
• US Class Current: 345/87
• CPC Class Codes: G02F 1/1343 Electrodes reflective electrodes G02F1/133553
• CPC Class Codes: G02F 1/134363 for applying an electric field parallel to the substrate, i.e. in-plane switching [IPS]
• CPC Class Codes: G02F 1/13624 having more than one switching element per pixel
• CPC Class Codes: G09G 2320/0261 in the context of movement of objects on the screen or movement of the observer relative to the screen
• CPC Class Codes: G09G 3/3659 the addressing of the pixel involving the control of two or more scan electrodes or two or more data electrodes, e.g. pixel voltage dependant on signal of two data electrodes

Abstract

Three electrodes (8, 9, 10) per pixel are used instead of the conventional two. In this way, a change of the orientation of LC molecules (3) can be regulated at will so as to obtain faster switching.

Claims

1. A liquid crystal display device comprising a nematic liquid crystal material between two substrates, one of which is provided with a matrix of selection electrodes and data electrodes with a pixel at the area of a crossing of the selection electrodes and data electrodes, and at least a switching element and drive means for driving the selection electrodes and data electrodes, the pixel comprising at least three electrodes and the drive means being provided with means for generating, in operation, electric fields in two mutually different directions.

2. A liquid crystal display device as claimed in claim 1, wherein two mutually substantially perpendicular fields are generated.

3. A liquid crystal display device as claimed in claim 1, wherein the drive means comprises means for bringing a pixel between two drive periods to a defined state.

4. A liquid crystal display device as claimed in claim 1 or 2, with a pixel between two substrates, wherein a first substrate comprises two electrodes at the location of the pixel, with a longitudinal direction at an angle.

5. A liquid crystal display device as claimed in claim 4, wherein the angle is substantially 90 degrees and the first substrate at the location of the pixel is further provided with a substantially L-shaped electrode.

6. A liquid crystal display device as claimed in claim 1 or 2, with a pixel between two substrates, wherein a first substrate comprises two electrodes at the location of the pixel and the second substrate is provided with at least a further electrode.

7. A liquid crystal display device as claimed in claim 1 or 2, wherein a first substrate comprises two electrodes at the location of the pixel, each electrode being provided with a respective switching element having the selection electrodes in common.

8. A liquid crystal display device as claimed in claim 7, wherein the switching elements have different switching voltages.

9. A liquid crystal display device as claimed in claim 1 or 2, wherein a first substrate comprises two electrodes at the location of the pixel, each electrode being provided with a respective switching element connected to different selection electrodes.