LIQUID CRYSTAL DISPLAY DEVICE

• US 20170261829A1
• Filed: 05/25/2017
• Published: 09/14/2017
• Est. Priority Date: 12/18/2009
• Status: Active Grant

• Current Assignee: Samsung Display Company Limited (Samsung Electronics Co. Ltd.)
• Original Assignee: Samsung Display Company Limited (Samsung Electronics Co. Ltd.)
• Inventors: SONG, Jang-Kun, HAM, Yeon-Sik, KIM, Kang-Woo, JEON, Yeon-Mun, LEE, Jeong Hyun
• Granted Patent: US 10,488,726 B2
• Time in Patent Office: Days
• CPC Class Codes: G02F 1/1343 Electrodes reflective electrodes G02F1/133553
• CPC Class Codes: G02F 1/134336 Matrix
• CPC Class Codes: G02F 1/134345 Subdivided pixels, e.g. for grey scale or redundancy
• 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 1/134381 Hybrid switching mode, i.e. for applying an electric field with components parallel and orthogonal to the substrates
• 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 1/136286 Wiring, e.g. gate line, drain line
• CPC Class Codes: G02F 1/155 Electrodes
• CPC Class Codes: G02F 2001/1552 Inner electrode, e.g. the electrochromic layer being sandwiched between the inner electrode and the support substrate
• CPC Class Codes: G02F 2201/50 Protective arrangements

Abstract

A liquid crystal display device includes a first substrate, a second substrate facing the first substrate, a dual passivation layer disposed between the first substrate and the second substrate. The dual passivation layer includes a first passivation layer and a second passivation layer. A refractive index of the first passivation layer is different from a refractive index of the second passivation layer.

Claims

1. A liquid crystal display device comprising:

a first substrate;

a second substrate facing the first substrate;

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

a first gate line and a second gate line disposed on the first substrate and being substantially parallel to each other;

a first common voltage line and a second common voltage line being substantially parallel to the first gate line, each of the first common voltage line and the second common voltage line including a plurality of expanded portions;

a first data line and a second data line crossing the first gate line and the second gate line and being substantially parallel to each other;

a first pixel electrode disposed in a first pixel;

a second pixel electrode disposed in a second pixel;

a third pixel electrode disposed in a third pixel;

a fourth pixel electrode disposed in a fourth pixel;

a common electrode disposed on the first substrate and overlapping the first pixel electrode, the second pixel electrode, the third pixel electrode, and the fourth pixel electrode; and

an insulating layer respectively between the first and second common voltage lines, and the common electrode,

wherein the first pixel and the second pixel are adjacent to each other in a column direction,

wherein the first common voltage line is adjacent to the first gate line, and

wherein a portion of the second pixel electrode overlaps the first common voltage line and an edge of the second pixel electrode is disposed between the first gate line and the first common voltage line.

2. The liquid crystal display device of claim 1, further comprising a thin film transistor connected to one of the first gate line and the second gate line and one of the first data line and the second data line,

wherein

a source electrode of the thin film transistor is a first portion of the one of the first data line and the second data line,

a drain electrode of the thin film transistor parallels the one of the first data line and the second data line, and

a channel area of the thin film transistor is disposed under the one of the first data line and the second data line and the drain electrode.

3. The liquid crystal display device of claim 2, wherein the common electrode comprises:

a first connection part disposed substantially parallel to the first date line and the second data line;

a second connection part disposed substantially parallel to the first gate line and the second gate line and connected to the first connection part; and

a branch electrode.

4. The liquid crystal display device of claim 3,

wherein the branch electrode comprises

a first part;

a second part connected to the first part; and

a third part connected to the first part and the second connection part,

wherein

the second part forms a first angle with the first part, and

the third part forms a second angle with the first part and a third angle with to the second connection part.

5. The liquid crystal display device of claim 4, wherein the first connection part overlaps a second portion of the first data line and the second data line.

6. The liquid crystal display device of claim 5,

wherein a first opening is formed in the common electrode and overlaps the channel area between the source electrode and the drain electrode,

wherein the first opening overlaps an entirety of the source electrode and an entire width of the first portion, and

wherein a second opening is formed in the first connection part of the common electrode and overlaps the second portion.

7. The liquid crystal display device of claim 1, further comprising a shielding electrode disposed under the first data line and the second data line and on the first substrate and overlapping a second portion of the first data line and the second data line.

8. The liquid crystal display of claim 1,

wherein the common electrode is connected to one of the first common voltage line and the second common voltage line through a first contact hole and a second contact hole, and

wherein first contact hole and the second contact hole are disposed in a red pixel or a blue pixel.

9. The liquid crystal display device of claim 1, further comprising a dual passivation layer disposed between the common electrode and the pixel electrodes, the dual passivation layer comprising:

a first passivation layer; and

a second passivation layer,

wherein a refractive index of the first passivation layer is different from a refractive index of the second passivation layer.

10. The liquid crystal display device of claim 9, wherein a nitrogen content of the first passivation layer is greater than a nitrogen content of the second passivation layer.

11. The liquid crystal display device of claim 6, wherein the first opening of the common electrode exposes a portion of the first and second pixel electrodes in a plan view.

12. The liquid crystal display device of claim 8, wherein the first contact hole and the second contact hole are disposed in one pixel of the three neighboring pixels.