Light valve panel and liquid crystal display using the same

Patent metadata

Field	Value
Publication number	US-2017032744-A1
Application number	US-201615222700-A
Country	US
Kind code	A1
Filing date	Jul 28, 2016
Priority date	Jul 29, 2015
Publication date	Feb 2, 2017
Grant date	—

Abstract

A light valve panel and a liquid crystal display using the same are discussed. The light valve panel according to an embodiment includes a transparent electrode layer having a plurality of blocks supplied with a voltage through data input lines. The transparent electrode layer has a low resistance or has a high resistance. When a transparent electrode layer has low resistance, each block is divided into a plurality of segment electrodes connected through a resistance pattern. A voltage is distributed to the plurality of segment electrodes of each block based on the resistance pattern. When a transparent electrode layer has high resistance, the voltage distribution in each block is based on a resistance difference that varies based on a distance between voltage feeding positions.

First claim

What is claimed is:

1 . A display device comprising:
a display panel; data input lines to supply a voltage; and a light valve panel to control an amount of light incident on the display panel, the light valve panel including a plurality of blocks supplied with a voltage through the data input lines, each block including a plurality of segment electrodes interconnected by a resistance pattern, wherein a voltage is distributed to the plurality of segment electrodes of each block based on the resistance pattern.

2 . The display device of claim 1 , wherein a luminance of a block gradually increases or decreases from one end to the other end of the block based on the voltage distributed to the plurality of segment electrodes of the block.

3 . The display device of claim 1 , wherein the segment electrodes and the resistance pattern include a transparent electrode material.

4 . The display device of claim 3 , wherein the transparent electrode material is indium tin oxide.

5 . The display device of claim 1 , wherein at least one of the data input lines is connected to the segment electrode of the plurality of segment electrodes of each block being positioned at an edge of the block and supplies the voltage to each block.

6 . The display device of claim 2 , wherein each segment electrode is supplied with different voltages.

7 . The display device of claim 6 , wherein the voltage applied to each segment electrode varies depending on a position of the corresponding segment electrode.

8 . The display device of claim 1 , wherein the resistance pattern is formed as a bent pattern of a zigzag shape.

9 . The display device of claim 1 , further comprising a plurality of feeding positions provided as a connection portion between the data input lines and the plurality of blocks,
wherein the voltage that is distributed to the plurality of segment electrodes of each block is based on a resistance difference that varies based on a distance between the plurality of voltage feeding positions.

10 . The display device of claim 1 , further comprising:
a backlight unit configured to irradiate light onto the display panel, wherein the light valve panel is disposed between the display panel and the backlight unit and configured to adjust an amount of light irradiated by the backlight unit depending on the an input image provided by the data input lines.

11 . The display device of claim 4 , wherein the display panel includes:
a first pixel configured to display high gray level data; and a second pixel positioned adjacent to the first pixel and configured to display low gray level data that is lower than the high gray level data, wherein the light valve panel further includes: a first block among the plurality of blocks is disposed in correspondence with the first pixel and is configured to irradiate light onto the first pixel; and a second block among the plurality of blocks is disposed in correspondence with the second pixel and is configured to irradiate light onto the second pixel, wherein a luminance of the second block gradually decreases as the distance to the second block increases from the first block based on the voltage distributed to the second block.

12 . The display device of claim 11 , wherein a gray level of the second pixel is reduced to below the low gray level.

13 . The display device of claim 12 , wherein as the distance to the second pixel increases from the first pixel, a gray level of data to be applied to the second pixel gradually increases.

14 . A display device comprising:
a display panel; data input lines to supply a voltage; and a light valve panel to control an amount of light incident on the display panel, wherein the light valve panel includes a single transparent electrode layer supplied with the voltage through the data input lines, wherein the single transparent electrode layer is divided into a plurality of blocks, wherein the data input lines are connected to each block of the single transparent electrode layer, the blocks being previously set in the single transparent electrode layer, and wherein the connection between the data input lines and each block is such that a voltage distribution is generated in each block.

15 . The display device of claim 14 , wherein the single transparent electrode layer is formed of indium zinc oxide.

16 . The display device of claim 14 , wherein the display device is a liquid crystal display device including a backlight unit to irradiate light onto the display panel, and
wherein the light valve panel is disposed between the display panel and the backlight unit to adjust an amount of light irradiated by the backlight unit depending on an input image displayed on the display panel.

17 . The display device of claim 14 , further comprising a plurality of feeding positions provided as a connection portion between the data input lines and the blocks,
wherein the voltage distribution generated in each block is based on a resistance difference that varies based on a distance between the plurality of voltage feeding positions.

Assignees

• Lg Display Co Ltd

Inventors

• Yoo Ooksang
• Lee Juyoung
• Nam Sangjin
• Yoo Seungjin

Classifications

• G02F2201/121

  common or background · CPC title

• G02F1/133512

  Light shielding layers, e.g. black matrix (G02F1/136209 takes precedence) · CPC title

• G09G2320/0242

  Compensation of deficiencies in the appearance of colours · CPC title

• G09G2320/0626

  for control of overall brightness · CPC title

• G02F1/1368

  in which the switching element is a three-electrode device {(G02F1/136277 takes precedence)} · CPC title