Liquid crystal display having subpixels per color pixel

• US 20060066797A1
• Filed: 09/21/2005
• Published: 03/30/2006
• Est. Priority Date: 09/24/2004
• Status: Active Grant

• Current Assignee: Samsung Display Company Limited (Samsung Electronics Co. Ltd.)
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: Baek, Seung-Soo
• Granted Patent: US 7,324,170 B2
• Time in Patent Office: Days
• US Class Current: 349/139
• CPC Class Codes: G02F 1/133531 characterised by the arrangement of polariser or analyser axes
• CPC Class Codes: G02F 1/133707 Structures for producing distorted electric fields, e.g. bumps, protrusions, recesses, slits in pixel electrodes
• CPC Class Codes: G02F 1/134336 Matrix
• CPC Class Codes: G02F 1/134345 Subdivided pixels, e.g. for grey scale or redundancy
• CPC Class Codes: G02F 2201/121 common or background

Abstract

A liquid crystal display includes: a first substrate; a gate line disposed on the first substrate; a data line intersecting the gate line; a thin film transistor connected to the gate line and the data line; a coupling electrode connected to the thin film transistor; a first sub-pixel electrode connected to the thin film transistor; a second sub-pixel electrode capacitively coupled to the coupling electrode; a second substrate facing the first substrate; a common electrode disposed on the second substrate; and a polarizer disposed on the first substrate or the second substrate and having a polarization axis. The coupling electrode is elongated substantially parallel to the polarization axis and has a first edge substantially parallel to or substantially perpendicular to the polarization axis.

Claims

1. A liquid crystal display comprising:

a first substrate;

a gate line disposed on the first substrate;

a data line intersecting the gate line;

a thin film transistor connected to the gate line and the data line;

a coupling electrode connected to the thin film transistor;

a first sub-pixel electrode connected to the thin film transistor;

a second sub-pixel electrode capacitively coupled to the coupling electrode;

a second substrate facing the first substrate;

a common electrode disposed on the second substrate; and

a polarizer having a polarization axis, disposed on one of the first substrate and the second substrate,

wherein the coupling electrode is elongated substantially parallel to the polarization axis and has a first edge substantially parallel to or substantially perpendicular to the polarization axis.

2. The liquid crystal display of claim 1, wherein the thin film transistor comprises a first electrode connected to the gate line, a second electrode connected to the data line, and a third electrode connected to the first sub-pixel electrode and to the coupling electrode.

3. The liquid crystal display of claim 2, wherein the third electrode has an edge substantially parallel to or substantially perpendicular to the polarization axis of the polarizer.

4. The liquid crystal display of claim 2, further comprising an interconnection connecting the third electrode and the coupling electrode.

5. The liquid crystal display of claim 4, wherein the interconnection has an edge substantially parallel to or substantially perpendicular to the polarization axis of the polarizer.

6. The liquid crystal display of claim 4, wherein the interconnection includes a portion extending substantially parallel to or substantially perpendicular to the polarization axis of the polarizer.

7. The liquid crystal display of claim 1, further comprising a storage electrode overlapping at least one of the first and the second pixel electrodes.

8. The liquid crystal display of claim 7, wherein the storage electrode has an edge substantially parallel to or substantially perpendicular to the polarization axis of the polarizer.

9. The liquid crystal display of claim 7, wherein the coupling electrode has a second edge oblique to the polarization axis of the polarizer and the storage electrode has an edge disposed near the second edge of the coupling electrode.

10. The liquid crystal display of claim 1, further comprising:

a partitioning member partitioning at least one of the first and the second sub-pixel electrodes into a plurality of sub-areas.

11. The liquid crystal display of claim 10, wherein the partitioning member has mirror symmetry with respect to a line.

12. The liquid crystal display of claim 10, wherein the partitioning member extend in a direction making an angle of about 45 degrees.

13. The liquid crystal display of claim 10, wherein the partitioning member comprises a cutout provided at the first sub-pixel electrode, the second subpixel electrode, or the common electrode.

14. The liquid crystal display of claim 10, further comprising a storage electrode overlapping the partitioning member.

16. The liquid crystal display of claim 10, wherein the coupling electrode is elongated substantially parallel to the polarization axis and has a first edge substantially parallel to or substantially perpendicular to the polarization axis.

15. A liquid crystal display comprising:

a first substrate;

a gate line disposed on the first substrate;

a data line intersecting the gate line;

a thin film transistor connected to the gate line and the data line;

a coupling electrode switchably connected to the gate line through the thin film transistor;

a first sub-pixel electrode switchably connected to the gate line through the thin film transistor;

a second sub-pixel electrode capacitively coupled to the coupling electrode;

a second substrate facing the first substrate;

a common electrode disposed on the second substrate; and

a polarizer having a polarization axis, disposed on one of the first substrate and the second substrate.