Display device

• US 10,254,608 B2
• Filed: 03/08/2016
• Issued: 04/09/2019
• Est. Priority Date: 08/21/2015
• 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: Noh, Jung Hun, Kano, Masataka, Moon, Yeon Keon, Song, Keun Kyu, Song, Jun Ho, Lee, Hyun Sup, Jang, Sang Hee, Choi, Byung Seok
• Primary Examiner(s): Caley, Michael H
• Assistant Examiner(s): Jung, Jonathan Y
• Application Number:
  US15/064,378
• Publication Number:
  US 20170052417A1
• Time in Patent Office: 1,127 Days
• CPC Class Codes: G02F 1/1343 Electrodes reflective electrodes G02F1/133553
• 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 1/134372 for fringe field switching [FFS] where the common electrode is not patterned
• CPC Class Codes: G02F 1/13606 having means for reducing parasitic capacitance
• CPC Class Codes: G02F 1/136209 Light shielding layers, e.g. black matrix, incorporated in the active matrix substrate, e.g. structurally associated with the switching element
• 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 1/13685 Top gates

Abstract

Provided is a display device.

The display device includes: a substrate; a light blocking pattern disposed on the substrate; a semiconductor pattern disposed on the light blocking pattern; a gate insulating layer disposed on the semiconductor pattern; a gate wiring; an interlayer insulating layer formed on the gate wiring; a first contact hole for exposing the source area; a data wiring disposed to extend in the second direction on the interlayer insulating layer and electrically connected to the source area via the first contact hole; a first passivation layer disposed on the data wiring; a second contact hole, which is disposed between the neighboring protrusion portions of the light blocking pattern so as not to overlap the light blocking pattern, and exposes the drain area; and a pixel electrode disposed on the first passivation layer and electrically connected to the drain area through the second contact hole.

Claims

1. A display device, comprising:

a substrate including a display area and a non-display area surrounding the display area;

a light blocking pattern disposed on the substrate and including a coupling portion extending in a first direction and a plurality of protrusion portions protruding in a second direction crossing the first direction from the coupling portion;

a semiconductor pattern disposed on the light blocking pattern and including a source area, a channel area and a drain area;

a gate insulating layer disposed on the semiconductor pattern;

a gate wiring including a gate line extending in the first direction on the gate insulating layer and a gate electrode overlapping the channel area;

an interlayer insulating layer formed on the gate wiring;

a first contact hole for exposing the source area through the interlayer insulating layer;

a data wiring extending in the second direction on the interlayer insulating layer and electrically connected to the source area via the first contact hole;

a first passivation layer disposed on the data wiring;

a second contact hole, which is disposed between the neighboring protrusion portions of the light blocking pattern so as not to overlap the light blocking pattern, and exposes the drain area through the interlayer insulating layer and the first passivation layer;

a pixel electrode disposed on the first passivation layer and electrically connected to the drain area through the second contact hole;

a common electrode, which is disposed between the first passivation layer and the pixel electrode and to which a common voltage is applied; and

a common wiring, which is disposed in a closed loop shape in the non-display area and surrounds the display area, being electrically connected to the common electrode,

wherein the coupling portion is connected to the common wiring which provides the common voltage,

wherein the common electrode and the common wiring are disposed on directly on a same layer, and

wherein the common electrode includes the same material as the common wiring.

2. The display device of claim 1, wherein the semiconductor layer comprises:

a first portion, which includes the source area, the channel area, and a portion of the drain area, and overlaps the data wiring;

a second portion, which forms another portion of the drain area, extends in the first direction, and is connected to the first portion.

3. The display device of claim 2, wherein the semiconductor layer further comprises:

a third portion, which forms the another portion of the drain area, extends in the second direction, and faces the first portion.

4. The display device of claim 1, wherein the light blocking pattern further includes a light blocking recess recessed from an edge of the light blocking pattern,

the gate wiring further includes a gate recess recessed from an edge of the gate wiring and overlapping the light blocking recess, and

the second contact hole overlaps the gate recess and the light blocking recess.

5. The display device of claim 1, wherein the light blocking pattern further includes a connection terminal extending in the first direction from the coupling portion to a non-display area.

6. The display device of claim 5, further comprising:

a planarization layer disposed between the first passivation layer and the pixel electrode;

the common wiring disposed to be insulated from the pixel electrode and including a connection portion;

a second passivation layer disposed between the common wiring and the pixel electrode;

a third contact hole for exposing the connection terminal through the second passivation layer, the planarization layer, the first passivation layer, and the interlayer insulating layer;

a fourth contact hole for exposing the connection portion through the second passivation layer; and

a bridge electrode disposed on the same layer as the pixel electrode, and disposed to electrically connect the connection terminal and the connection portion through the third contact hole and the fourth contact hole.

7. The display device of claim 5, further comprising:

a planarization layer disposed between the first passivation layer and the pixel electrode;

the common wiring disposed to be insulated from the pixel electrode and including a connection portion; and

a third contact hole for exposing the connection terminal through the planarization layer, the first passivation layer, and the interlayer insulating layer,

wherein the connection portion is electrically connected to the connection terminal through the third contact hole.

8. The display device of claim 5, further comprising:

a buffer layer disposed between the light blocking pattern and the semiconductor layer;

a planarization layer disposed between the first passivation layer and the pixel electrode;

the-common wiring disposed to be insulated from the pixel electrode and including a connection portion;

a third contact hole for exposing the connection terminal through the buffer layer;

a bridge electrode disposed on the same layer as the gate wiring and electrically connected to the connection terminal through the third contact hole; and

a fourth contact hole for exposing the bridge electrode through the planarization layer, the first passivation layer, and the interlayer insulating layer,

wherein the connection portion is electrically connected to the bridge electrode through the fourth contact hole.

9. The display device of claim 5, further comprising:

a buffer layer disposed between the light blocking pattern and the semiconductor layer;

a planarization layer disposed between the first passivation layer and the pixel electrode;

the common wiring disposed to be insulated from the pixel electrode and including a connection portion;

a third contact hole for exposing the connection terminal through the buffer layer and the interlayer insulating layer;

a bridge electrode disposed on the same layer as the data wiring and electrically connected to the connection terminal through the third contact hole; and

a fourth contact hole for exposing the bridge electrode through the planarization layer and the first passivation layer,

wherein the connection portion is electrically connected to the bridge electrode through the fourth contact hole.

10. The display device of claim 1, wherein the light blocking pattern is formed of a metal material.

11. The display device of claim 1, wherein the first contact hole overlaps the source area and the data wiring.

12. A display device, comprising:

a substrate including a display area including a plurality of pixels arranged in a matrix shape in a first direction and a second direction perpendicular to the first direction, and a non-display area surrounding the display area;

a light blocking pattern disposed at each row of the pixels on the substrate;

a first insulating layer disposed on the light blocking pattern;

a common electrode, which is disposed on the first insulating layer and to which a common voltage is applied;

a pixel electrode, which is disposed at each of the pixels on the first insulating layer and to which a pixel voltage is applied; and

a common wiring, which is disposed in a closed loop shape in the non-display area and surrounds the display area, electrically connected to the common electrode,

wherein the light blocking pattern includes a coupling portion extending in the first direction and a plurality of protrusion portions protruding in the second direction from the coupling portion,

wherein the coupling portion is connected to the common wiring which provides the common voltage,

wherein the common voltage is applied to the light blocking pattern,

wherein the common electrode and the common wiring are disposed on directly on a same layer, and

wherein the common electrode includes the same material as the common wiring.

13. The display device of claim 12, further comprising a first contact hole for exposing the light blocking pattern through the first insulating layer outside the display area, wherein the light blocking pattern is electrically connected to the common electrode through the first contact hole.

14. The display device of claim 13, further comprising:

a second insulating layer disposed between the common electrode and the pixel electrode;

a common wiring, which is disposed in the same layer as the common electrode outside the display area, includes a connection portion, and is electrically connected to the common electrode;

a second contact hole for exposing the connection portion through the second insulating layer; and

a bridge electrode formed in the same layer as the pixel electrode and configured to connect the light blocking pattern and the connection portion through the first contact hole and the second contact hole.

15. The display device of claim 14, wherein the light blocking pattern further includes a connection terminal extending from the coupling portion along the first direction to outside the display area and exposed by the first contact hole, and the connection terminal is electrically connected to the bridge electrode.

16. The display device of claim 13, further comprising:

a second insulating layer disposed between the common electrode and the pixel electrode; and

a common wiring, which is disposed on the same layer as the common electrode and disposed outside the display area, including a connection portion and being electrically connected to the common electrode,

wherein the light blocking pattern is electrically connected to the connection portion through the first contact hole.

17. The display device of claim 16, wherein the light blocking pattern further includes a connection terminal extending from the coupling portion along the first direction to outside the display area and exposed by the first contact hole, and the connection terminal is electrically connected to the connection portion.

18. The display device of claim 12, wherein the light blocking pattern is formed of a metal material.