Liquid crystal display device

• US 10,423,034 B2
• Filed: 06/27/2018
• Issued: 09/24/2019
• Est. Priority Date: 02/26/2008
• Status: Active Grant

• Current Assignee: Panasonic Intellectual Property Corporation of America (Panasonic Holdings Corporation)
• Original Assignee: Japan Display Incorporated
• Inventors: Ochiai, Takahiro, Sasaki, Tohru, Nagata, Tetsuya
• Primary Examiner(s): Lau, Edmond C
• Application Number:
  US16/019,937
• Publication Number:
  US 20180307072A1
• Time in Patent Office: 454 Days
• CPC Class Codes: G02F 1/1339 Gaskets; Spacers; Sealing of cells
• CPC Class Codes: G02F 1/13394 spacers regularly patterned on the cell subtrate, e.g. walls, pillars G02F1/133377 takes precedence
• CPC Class Codes: G02F 1/13415 Drop filling process
• CPC Class Codes: G02F 1/134363 for applying an electric field parallel to the substrate, i.e. in-plane switching [IPS]
• CPC Class Codes: G02F 1/13606 having means for reducing parasitic capacitance
• CPC Class Codes: G02F 1/136227 Through-hole connection of the pixel electrode to the active element through an insulation layer
• CPC Class Codes: G02F 1/136277 formed on a semiconductor substrate, e.g. of silicon
• 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 column for defining the interval between a TFT substrate and an opposed substrate is formed at a crossing point between a drain line and a scanning line. At the crossing point where the column is formed, the drain line is formed to have a wider width to prevent light leakage. Further, at the crossing point where the column is formed, the scanning line is formed to have a narrower width to prevent increase of capacitance between the drain line and the scanning line. The column is formed at a crossing point corresponding to a specific color, e.g., a blue pixel B, so that a difference in transmittance and in characteristic of thin film transistors due to formation of the column is initially compensated.

Claims

1. A liquid crystal display device comprising:

a first substrate;

a second substrate;

liquid crystal enclosed between the first substrate and the second substrate;

a scanning line formed between the first substrate and the liquid crystal;

a drain line crossing the scanning line;

a thin film transistor having a semiconductor layer and a source electrode,

a first insulation film above the semiconductor layer and having a first contact hole and a second contact hole, the semiconductor layer being connected to the drain line via the first contact hole and connected to the source electrode via the second contact hole;

an organic film above the source electrode;

a second insulation film;

a common electrode between the organic film and the second insulation film;

a first pixel electrode above the second insulation film and connected to the source electrode via a third contact hole formed in the second insulation film;

a second pixel electrode adjacent to the first pixel electrode; and

a spacer disposed between the first substrate and the second substrate,

wherein the scanning line has a first side and a second side opposite to the first side in the plan view, the first pixel electrode is located on the first side and the second pixel electrode is located on the second side,

wherein the semiconductor layer overlapped with the scanning line at a first channel region and a second channel region, and a part of the semiconductor layer between the first channel region and the second channel region is located on the second side of the scanning line,

wherein the spacer is overlapped with the semiconductor layer, the drain line, the organic film, and the common electrode,

wherein the first contact hole, the second contact hole, and the third contact hole are located on the first side of the scanning line, and

wherein the part of the semiconductor layer between the first channel region and the second channel region is overlapped with the second pixel electrode.

2. A liquid crystal display device according to claim 1,

wherein the scanning line is disposed between the semiconductor layer and the spacer in a cross-section view.

3. A liquid crystal display device according to claim 1, wherein the spacer is formed on the first substrate.

4. A liquid crystal display device according to claim 1,

wherein the second pixel electrode is overlapped with the scanning line.

5. A liquid crystal display device according to claim 4,

wherein the first pixel electrode is overlapped with the scanning line.

6. A liquid crystal display device according to claim 1,

wherein the organic film has a through hole, and the third contact hole is located in the through hole in the plan view.

7. A liquid crystal display device according to claim 6,

wherein the second insulation film contacts the source electrode.

8. A liquid crystal display device according to claim 1

wherein the spacer is provided on the second substrate and located away from the third contact hole.