Liquid crystal display device

• US 9,864,239 B2
• Filed: 02/01/2016
• Issued: 01/09/2018
• Est. Priority Date: 04/29/2015
• Status: Active Grant

• Current Assignee: TCL China Star Optoelectronics Technology Co. Ltd. (TCL Technology Group Corp.)
• Original Assignee: Samsung Display Company Limited (Samsung Electronics Co. Ltd.)
• Inventors: Seo, Miseon, Jung, Keumdong, Kim, Kihwan, Lee, Jooyeon, Park, Munsoo
• Primary Examiner(s): Nguyen, Sang V
• Application Number:
  US15/011,795
• Publication Number:
  US 20160320674A1
• Time in Patent Office: 708 Days
• CPC Class Codes: G02F 1/134309 characterised by their geometrical arrangement
• CPC Class Codes: G02F 1/134345 Subdivided pixels, e.g. for grey scale or redundancy
• CPC Class Codes: G02F 1/13624 having more than one switching element per pixel
• CPC Class Codes: G02F 1/136286 Wiring, e.g. gate line, drain line
• CPC Class Codes: G02F 1/1368 in which the switching element is a three-electrode device G02F1/136277 takes precedence

Abstract

A liquid crystal display (“LCD”) device capable of easily setting up an accurate resistance ratio between thin film transistors, the LCD device includes a first substrate including a gate line and a data line, a second substrate opposing the first substrate, a liquid crystal layer between the first substrate and the second substrate, a first sub-pixel electrode in a first sub-pixel region of the first substrate, a second sub-pixel electrode in a second sub-pixel region of the first substrate, a first transistor connected to the gate line, the data line, and the first sub-pixel electrode, a second transistor connected to the gate line, the first transistor, and the second sub-pixel electrode, and a third transistor connected to the gate line, the second sub-pixel electrode, and a storage line, wherein one of the first, second, and third transistors includes a plurality of divided channel regions.

Claims

1. A liquid crystal display device comprising:

a first substrate comprising a gate line and a data line;

a second substrate opposing the first substrate;

a liquid crystal layer between the first substrate and the second substrate;

a first sub-pixel electrode in a first sub-pixel region of the first substrate;

a second sub-pixel electrode in a second sub-pixel region of the first substrate;

a first transistor connected to the gate line, the data line, and the first sub-pixel electrode;

a second transistor connected to the gate line, the first transistor, and the second sub-pixel electrode; and

a third transistor connected to the gate line, the second sub-pixel electrode, and a storage line,

wherein the second transistor comprises a plurality of divided channel regions;

wherein one of the plurality of divided channel regions of the second transistor has the same shape and area as a shape and an area of the channel region of the third transistor.

2. The liquid crystal display device of claim 1, wherein a number of the plurality of divided channel regions of second transistor is “

n”

times (“

n”

being a natural number) greater than a number of channel regions of one the first and third transistors.

3. The liquid crystal display device of claim 2, wherein a number of the plurality of divided channel regions of the second transistor is “

n”

times greater than a number of channel regions of the third transistor.

4. The liquid crystal display device of claim 1, wherein a number of channel regions of the first transistor is equal to a number of channel regions of the third transistor.

5. The liquid crystal display device of claim 1, wherein a source electrode and a drain electrode included in the one of the first, second and third transistors have a same number of protrusions.

6. The liquid crystal display device of claim 1, wherein a total area of the plurality of divided channel regions included in the second transistor is greater than the area of the channel region included in the third transistor.

7. The liquid crystal display device of claim 1, wherein respective end portions of a source electrode and a drain electrode facing one another of at least one of the first, second, and third transistors have a curved shape.

8. The liquid crystal display device of claim 7, wherein the end portion of the source electrode and the end portion of the drain electrode each include a plurality of sides having different lengths.

9. The liquid crystal display device of claim 8, wherein the end portion of the source electrode and the end portion of the drain electrode each include sides having the different lengths at respective corresponding positions.

10. The liquid crystal display device of claim 7, wherein the end portion of the source electrode has a same length as a length of the end portion of the drain electrode facing one another.