Liquid crystal display device

Patent metadata

Field	Value
Publication number	US-2016246089-A1
Application number	US-201614989477-A
Country	US
Kind code	A1
Filing date	Jan 6, 2016
Priority date	Feb 23, 2015
Publication date	Aug 25, 2016
Grant date	—

Abstract

A liquid crystal display includes: first and second thin film transistors and a compensation transistor formed on a first insulation substrate; a first gray subpixel electrode connected to a drain electrode of the first thin film transistor; a second gray subpixel electrode connected to a drain electrode of the compensation transistor and a drain electrode of the second thin film transistor; and first and second reference voltage lines overlapping at least one of the second gray subpixel electrode and the first gray subpixel electrode, wherein a pixel area occupied by the first gray subpixel electrode and the second gray subpixel electrode is extended in a first direction, the first and second reference voltage lines are extended in a second direction, which is substantially perpendicular to the first direction, to overlap the pixel area, and one of the first and second reference voltage lines is connected to a source electrode of the compensation transistor.

First claim

What is claimed is:

1 . A liquid crystal display, comprising:
a first substrate; gate lines disposed on the first substrate and extending in a first direction; a first thin film transistor, a second thin film transistors, and a compensation transistor which are disposed on the first substrate; a first gray subpixel electrode connected to a drain electrode of the first thin film transistor; a second gray subpixel electrode connected to a drain electrode of the compensation transistor and a drain electrode of the second thin film transistor; and a first reference voltage line and a second reference voltage line each extending in a second direction different from the first direction, wherein one of the first and second reference voltage lines is connected to a source electrode of the compensation transistor, and each of the first reference voltage line and the second reference voltage line overlaps both the first and second gray subpixel electrode.

2 . The liquid crystal display of claim 1 , wherein
the second gray subpixel electrode and the first gray subpixel electrode are adjacent to each other in the second direction, and each of the first and second gray subpixel electrodes is longer in the first direction than in the second direction.

3 . The liquid crystal display of claim 2 , wherein each of the first gray subpixel electrode and the second gray subpixel electrode includes at least one unit pixel electrode, and
each of the unit pixel electrodes includes one pixel central part and a plurality of branches extending from the pixel central part.

4 . The liquid crystal display of claim 3 , further comprising:
a second substrate opposing the first substrate; a liquid crystal layer between the first substrate and the second substrate; and a common electrode disposed between the liquid crystal layer and the second substrate, wherein the common electrode includes a cross-shaped opening overlapping the pixel central part.

5 . The liquid crystal display of claim 4 , wherein the common electrode further includes a central opening disposed at a center of the cross-shaped opening.

6 . The liquid crystal display of claim 3 , wherein the first and second reference voltage lines respectively overlap the pixel central part of each of the first and second gray subpixel electrodes.

7 . The liquid crystal display of claim 1 , further comprising:
data lines extending in the second direction, wherein gate electrodes of the first and second thin film transistors and the compensation transistor all are connected to a same first gate line.

8 . The liquid crystal display of claim 7 , wherein both of source electrodes of the first and second thin film transistors are connected to a same first data line.

9 . The liquid crystal display of claim 8 , wherein the first and second thin film transistors, the compensation transistor, the first gray subpixel electrode, and the second gray subpixel electrode are included in a first pixel,
a second pixel disposed adjacent to the first pixel in the second direction is connected to a second gate line and a second data line, and the first pixel and the second pixel are connected to different ones of the first and second reference voltage lines from each other.

10 . The liquid crystal display of claim 9 , wherein
a voltage level of the first reference voltage line is different from a voltage level of the second reference voltage line, and the voltage level of each of the first and second reference voltage lines swings between a high level and a low level at a predetermined cycle.

11 . The liquid crystal display of claim 8 , wherein the first and second thin film transistors, the compensation transistor, the first gray subpixel electrode, and the second gray subpixel electrode are included in a first pixel,
a third pixel disposed adjacent to the first pixel in the first direction is connected to the first gate line and a third data line, and the reference voltage line among the first and second reference voltage lines connected to the first pixel and the reference voltage line among the first and second reference voltage lines connected to the third pixel and the reference transmit a same voltage.

12 . The liquid crystal display of claim 11 , wherein
a voltage level of the first reference voltage line is different from a voltage level of the second reference voltage line, and the voltage level of each of the first and second reference voltage lines swings between a high level and a low level at a predetermined cycle.

13 . A liquid crystal display, comprising:
a first substrate; gate lines disposed on the first substrate and extending in a first direction; a first thin film transistor, a second thin film transistor, and a compensation transistor which are disposed on the first substrate; a first gray subpixel electrode connected to a drain electrode of the first thin film transistor; a second gray subpixel electrode connected to a drain electrode of the compensation transistor and a drain electrode of the second thin film transistor; and a first reference voltage line and a second reference voltage line each extending in a second direction different from the first direction, wherein one of the first and second reference voltage lines is connected to a source electrode of the compensation transistor, and both the first reference voltage line and the second reference voltage line overlap one of the first gray subpixel electrode and the second gray subpixel electrode.

14 . The liquid crystal display of claim 13 , wherein
the one of the first gray subpixel electrode and the second gray subpixel electrode that overlaps both the first reference voltage line and the second reference voltage line includes two electrode parts spaced apart from each other, and another of the first gray subpixel electrode and the second gray subpixel electrode that does not overlap both the first reference voltage line and the second reference voltage line includes one electrode part disposed between the two electrode parts.

15 . The liquid crystal display of claim 14 , wherein
the first reference voltage line overlaps one of the two electrode parts, and the second reference voltage line overlaps another of the two electrode parts.

16 . The liquid crystal display of claim 15 , wherein each of the first or second gray subpixel electrode and the two electrode parts includes at least one unit pixel electrode, and
each of the unit pixel electrodes includes one pixel central part and a plurality of branches extending from the pixel central part.

17 . The liquid crystal display of claim 16 , further comprising:
a second substrate opposing the first substrate; a liquid crystal layer between the first substrate and the second substrate; and a common electrode disposed between the liquid crystal layer and the second substrate, wherein the common electrode includes a cross-shaped opening overlapping the pixel central part.

18 . The liquid crystal display of claim 17 , wherein the common electrode further includes a central opening disposed at a center of the cross-shaped opening.

19 . The liquid crystal display of claim 16 , wherein the first and second reference voltage lines respectively overlap the pixel central part of the one of the first gray subpixel electrode and the second gray subpixel electrode that overlaps both the first reference voltage line and the second reference voltage line.

20 . The liquid crystal display of claim

Assignees

• Samsung Display Co Ltd

Inventors

• Jeong Youn Hak
• Kim Bo Yeong
• Kim Jang Soo
• Yoon Hong Min
• Lee Seong Young
• Lee Ho Jun

Classifications

• G02F1/136286

  Wiring, e.g. gate line, drain line · CPC title

• G02F1/13624

  having more than one switching element per pixel · CPC title

• G02F1/134309 Primary

  characterised by their geometrical arrangement · CPC title

• G02F1/1368 Primary

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

• G02F1/136227 Primary

  Through-hole connection of the pixel electrode to the active element through an insulation layer · CPC title