Liquid crystal display

Patent metadata

Field	Value
Publication number	US-10520781-B2
Application number	US-201916374519-A
Country	US
Kind code	B2
Filing date	Apr 3, 2019
Priority date	Mar 15, 2013
Publication date	Dec 31, 2019
Grant date	Dec 31, 2019

Abstract

The present invention relates to a liquid crystal display including: a lower electrode including a unit pixel electrode; an upper electrode including an upper unit electrode facing the unit pixel electrode; and a liquid crystal layer between the lower electrode and the upper electrode and including a plurality of liquid crystal molecules aligned approximately perpendicular to the surfaces of the lower electrode and the upper electrode in the absence of an electric field, wherein the unit pixel electrode includes a stem forming a boundary between a plurality of sub-regions and a plurality of minute branches extending in different directions in two different sub-regions, the upper unit electrode includes an opening facing the stem and extending parallel to the stem, any alignment aid to pretilt the liquid crystal molecules is absent, and a length of the minute branches is equal to or less than about 53 μm.

First claim

What is claimed is:

1. A liquid crystal display comprising:
a first electrode including at least one first unit electrode;
a second electrode facing the first electrode and including at least one second unit electrode; and
a liquid crystal layer disposed between the first electrode and the second electrode and including a plurality of liquid crystal molecules,
wherein
a first unit electrode of the at least one first unit electrode includes:
a planar portion including a first edge and a second edge that extend in different directions from each other, the first edge and the second edge extending obliquely to a first direction; and
a plurality of branches extending from the first edge and the second edge of the planar portion, and

wherein a second unit electrode of the at least one second unit electrode overlaps the plurality of branches of the first unit electrode in a plan view, and includes a first opening overlapping the planar portion of the first unit electrode in the plan view and extending in the first direction to cross the planar portion of the first unit electrode in the first direction in the plan view.

2. The liquid crystal display of claim 1 , wherein the a second unit electrode further includes a second opening connected to the first opening and having an edge extending oblique to the first direction.

3. The liquid crystal display of claim 1 , wherein the first edge and the second edge of the planar portion are substantially symmetrical with respect to the first opening of the second unit electrode.

4. The liquid crystal display of claim 3 , wherein a shape of the planar portion is substantially symmetrical with respect to the first opening of the second unit electrode.

5. The liquid crystal display of claim 1 , wherein the plurality of branches extend substantially perpendicular to the first edge and the second edge of the planar portion.

6. The liquid crystal display of claim 5 , wherein the plurality of branches extend obliquely to the first direction.

7. The liquid crystal display of claim 1 , wherein
the first electrode includes a plurality of first unit electrodes connected to each other,
the second electrode includes a plurality of second unit electrodes connected to each other.

8. The liquid crystal display of claim 1 , wherein
the liquid crystal display includes a plurality of pixels,
a pixel of the plurality of pixels includes a first sub-pixel and a second sub-pixel that are configured to display images having different luminances from each other for one input image signal,
each of the first sub-pixel and the second sub-pixel includes the first electrode and the second electrode, and
a number of the at least one first unit electrode included in the second sub-pixel is larger than a number of the at least one first unit pixel electrode included in the first sub-pixel.

9. A liquid crystal display comprising:
a first electrode including at least one first unit electrode;
a second electrode facing the first electrode and including at least one second unit electrode; and
a liquid crystal layer disposed between the first electrode and the second electrode and including a plurality of liquid crystal molecules,
wherein
a first unit electrode of the at least one first unit electrode includes:
a planar portion including a first edge and a second edge that extend in different directions from each other, the first edge and the second edge extending obliquely to a first direction; and
a plurality of branches extending from the first edge and the second edge of the planar portion, and

wherein a second unit electrode of the at least one second unit electrode includes a first opening overlapping the planar portion of the first unit electrode in the plan view and extending in the first direction, and a second opening connected to the first opening and having edges substantially parallel to the first edge or the second edge of the planar portion.

10. The liquid crystal display of claim 9 , wherein the edges of the second opening extend oblique to the first direction.

11. The liquid crystal display of claim 9 , wherein the first edge and the second edge of the planar portion are substantially symmetrical with respect to the first opening of the second unit electrode.

12. The liquid crystal display of claim 11 , wherein a shape of the planar portion is substantially symmetrical with respect to the first opening of the second unit electrode.

13. The liquid crystal display of claim 9 , wherein the plurality of branches extend substantially perpendicular to the first edge and the second edge of the planar portion.

14. The liquid crystal display of claim 13 , wherein the plurality of branches extend obliquely to the first direction.

15. The liquid crystal display of claim 9 , wherein
the first electrode includes a plurality of first unit electrodes connected to each other,
the second electrode includes a plurality of second unit electrodes connected to each other.

16. The liquid crystal display of claim 9 , wherein
the liquid crystal display includes a plurality of pixels,
a pixel of the plurality of pixels includes a first sub-pixel and a second sub-pixel that are configured to display images having different luminances from each other for one input image signal,
each of the first sub-pixel and the second sub-pixel includes the first electrode and the second electrode, and
a number of the at least one first unit electrode included in the second sub-pixel is larger than a number of the at least one first unit pixel electrode included in the first sub-pixel.

Assignees

• Samsung Display Co Ltd

Inventors

• Ryu Jang Wi
• Shin Cheol
• Chang Hak Sun
• Shin Ki Chul
• Jang Jae-Soo
• Kim Ka Eun
• Oh Ho Kil
• Lee Se Hyun
• Jung Hyo Ju
• Song Sang Hyeon
• Jeon Sang Jin

Classifications

• G02F1/134309

  characterised by their geometrical arrangement · CPC title

• G02F1/133707 Primary

  Structures for producing distorted electric fields, e.g. bumps, protrusions, recesses, slits in pixel electrodes · CPC title

• G02F1/133345

  Insulating layers (G02F1/1335, G02F1/1337, G02F1/135, G02F1/136 take precedence) · CPC title

• G02F2203/01

  transmissive · CPC title

• G02F1/1393

  the birefringence of the liquid crystal being electrically controlled, e.g. ECB-, DAP-, HAN-, PI-LC cells (G02F1/1396, G02F1/141 take precedence) · CPC title