Liquid crystal display

Patent metadata

Field	Value
Publication number	US-10276721-B2
Application number	US-201514754039-A
Country	US
Kind code	B2
Filing date	Jun 29, 2015
Priority date	Jan 6, 2015
Publication date	Apr 30, 2019
Grant date	Apr 30, 2019

Abstract

A liquid crystal display includes a first gate line, a first data line, and a first pixel. The first pixel includes: a first subpixel including a first thin film transistor connected to the first gate line and data line, and a first liquid crystal capacitor, wherein a first terminal of the first liquid crystal capacitor is electrically connected to the first thin film transistor and a second terminal of the first liquid crystal capacitor is configured to receive a common voltage; and a second subpixel including a second thin film transistor connected to the first gate line and data line, a second liquid crystal capacitor, wherein a first terminal of the second liquid crystal capacitor is configured to receive the common voltage, and a thin film transistor resistor electrically connected between the second thin film transistor and a second terminal of the second liquid crystal capacitor.

First claim

What is claimed is:

1. A liquid crystal display comprising:
a liquid crystal panel including a plurality of gate lines including a first gate line, a plurality of data lines including a first data line, and a plurality of pixels including a first pixel connected to the first gate line and the first data line, wherein the first pixel is configured to receive a common voltage;
a data driver connected to the data line and configured to apply a data voltage; and
a gate driver connected to the gate line and configured to apply a gate voltage,
wherein the first pixel includes:
a first subpixel including a first thin film transistor connected to the first gate line and the first data line, and a first liquid crystal capacitor, wherein a first terminal of the first liquid crystal capacitor is electrically connected to the first thin film transistor and a second terminal of the first liquid crystal capacitor is configured to receive the common voltage; and
a second subpixel including:
a second thin film transistor including a first electrode, a second electrode, and a gate electrode, wherein the gate electrode is connected to the first gate line and the first electrode is connected to the first data line;
a second liquid crystal capacitor including a first terminal and a second terminal, wherein the first terminal of the second liquid crystal capacitor is configured to receive the common voltage; and
a thin film transistor resistor including a first terminal and a second terminal, wherein the first terminal of the thin film transistor resistor is connected to the second electrode of the second thin film transistor, and the second terminal of the thin film transistor resistor is connected to the second terminal of the second liquid crystal capacitor,

wherein the thin film transistor resistor includes:
a first thin film transistor resistor, wherein a positive resistance of the first thin film transistor resistor is less than a negative resistance of the first thin film transistor resistor; and
a second thin film transistor resistor coupled to the first thin film transistor in parallel, wherein a positive resistance of the second thin film transistor resistor is greater than a negative resistance of the second thin film transistor resistor.

2. The liquid crystal display of claim 1 , wherein the thin film transistor resistor includes:
an insulating layer;
an amorphous silicon layer formed on an upper portion of the insulating layer;
a first ohmic contact layer and a second ohmic contact layer formed respectively on upper portions of a first region and a second region of the amorphous silicon layer;
a first electrode and a second electrode formed respectively on upper portions of partial regions of the first ohmic contact layer and the second ohmic contact layer; and
a third electrode formed on a lower portion of the insulating layer,
wherein a resistance of the thin film transistor resistor is controlled by a voltage applied to the third electrode.

3. The liquid crystal display of claim 2 , wherein the third electrode is formed on a lower portion of a region of the insulating layer overlapping the first electrode, and is not formed on a lower portion of a region of the insulating layer overlapping the second electrode.

4. The liquid crystal display of claim 3 , wherein the resistance of the thin film transistor resistor is controlled by light from a backlight irradiated onto the lower portion of the insulating layer.

5. The liquid crystal display of claim 2 , wherein the third electrode is separately formed on the lower portion of the region of the insulating layer overlapping the first electrode, and on the lower portion of the region of the insulating layer overlapping the second electrode.

6. The liquid crystal display of claim 5 , wherein the resistance of the thin film transistor resistor is controlled by light from a backlight irradiated onto the lower portion of the insulating layer.

7. A liquid crystal display comprising:
a liquid crystal panel including a plurality of gate lines including a first gate line, a plurality of data lines including a first data line, and a plurality of pixels including a first pixel connected to the first gate line and the first data line, wherein the first pixel is configured to receive a common voltage;
a data driver connected to the data line and configured to apply a data voltage; and
a gate driver connected to the gate line and configured to apply a gate voltage,
wherein the first pixel includes:
a first subpixel including a first thin film transistor connected to the first gate line and the first data line, and a first liquid crystal capacitor, wherein a first terminal of the first liquid crystal capacitor is electrically connected to the first thin film transistor and a second terminal of the first liquid crystal capacitor is configured to receive the common voltage; and
a second subpixel including a second thin film transistor connected to the first gate line and the first data line, a second liquid crystal capacitor, wherein a first terminal of the second liquid crystal capacitor is configured to receive the common voltage, and a thin film transistor resistor electrically connected between the second thin film transistor and a second terminal of the second liquid crystal capacitor, wherein the thin film transistor resistor includes:
a first thin film transistor resistor, wherein a positive resistance of the first thin film transistor resistor is less than a negative resistance of the first thin film transistor resistor; and
a second thin film transistor resistor coupled to the first thin film transistor in parallel, wherein a positive resistance of the second thin film transistor resistor is greater than a negative resistance of the second thin film transistor resistor.

8. The liquid crystal display of claim 7 , wherein each of the first thin film transistor resistor and the second thin film transistor resistor includes:
an insulating layer;
an amorphous silicon layer formed on an upper portion of the insulating layer;
a first ohmic contact layer and a second ohmic contact layer formed respectively on upper portions of a first region and a second region of the amorphous silicon layer;
a first electrode and a second electrode formed respectively on upper portions of partial regions of the first ohmic contact layer and the second ohmic contact layer; and
a third electrode formed on a lower portion of the insulating layer,
wherein a third electrode of the first thin film transistor resistor is formed on the lower portion of the region of the insulating layer overlapping the first electrode, and is not formed on the lower portion of the region of the insulating layer overlapping the second electrode, and
wherein a third electrode of the second thin film transistor resistor is formed on the lower portion of the region of the insulating layer overlapping the second electrode, and is not formed on the lower portion of the region of the insulating layer overlapping the first electrode.

9. The liquid crystal display of claim 8 , wherein each of the first thin film transistor resistor and the second thin film transistor includes:
an insulating layer;
an amorphous silicon layer formed on an upper portion of the insulating layer;
a first ohmic contact layer and a second ohmic contact layer formed respectively on upper portions of a first region and a second region of the amorphous silicon layer;
a first electrode and a second electrode formed respectively on upper portions of partial regions of the first ohmic contact layer and the second ohmic contact layer; and
a third electrode formed on the lower portion of the region of the insulating layer overlapping the first ele

Assignees

• Samsung Display Co Ltd

Inventors

• Jung Jae Hoon
• Park Heung Shik
• Shin Ki Chul
• Yang Dan Bi
• Han Min-Joo
• Hong Ji Phyo

Classifications

• G02F1/1368

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

• G02F1/13624

  having more than one switching element per pixel · CPC title

• G09G2320/028

  by changing the viewing angle properties, e.g. widening the viewing angle, adapting the viewing angle to the view direction · CPC title

• G09G2300/0447

  for multi-domain technique to improve the viewing angle in a liquid crystal display, such as multi-vertical alignment [MVA] · CPC title

• G09G2300/0465

  Improved aperture ratio, e.g. by size reduction of the pixel circuit, e.g. for improving the pixel density or the maximum displayable luminance or brightness · CPC title