Array substrate and manufacturing method thereof, and display device

Patent metadata

Field	Value
Publication number	US-2016195751-A1
Application number	US-201314357725-A
Country	US
Kind code	A1
Filing date	Dec 5, 2013
Priority date	Jun 24, 2013
Publication date	Jul 7, 2016
Grant date	—

Abstract

An array substrate, a manufacturing method thereof, and a display device are provided. The array substrate comprises a thin film transistor ( 202 ) on a base substrate ( 201 ), and an electrode structure ( 203 ) on the thin film transistor ( 202 ), and the electrode structure ( 203 ) includes a pixel electrode ( 2031 ) and a common electrode ( 2032 ) insulated from each other. The array substrate further comprises: a black matrix ( 204 ) disposed on the thin film transistor ( 202 ), an orthographic projection of the thin film transistor ( 202 ) on the base substrate ( 201 ) is located within an orthographic projection of the black matrix ( 204 ) on the base substrate ( 201 ), and the black matrix ( 204 ) is electrically connected with the common electrode ( 2032 ) for providing common electrode signals to the common electrode ( 2032 ).

First claim

1 . An array substrate comprising a base substrate, a thin film transistor disposed on the base substrate, and an electrode structure disposed on the thin film transistor, the electrode structure comprising a pixel electrode and a common electrode insulated from each other, and the array substrate further comprising:
a black matrix disposed on the thin film transistor, wherein an orthographic projection of the thin film transistor on the base substrate is located within an orthographic projection of the black matrix on the base substrate; and wherein the black matrix is electrically connected to the common electrode for providing common electrode signals to the common electrode.

2 . The array substrate according to claim 1 , wherein the black matrix is directly electrically connected to the common electrode.

3 . The array substrate according to claim 2 , wherein the black matrix is directly disposed on the common electrode.

4 . The array substrate according to claim 1 , wherein the black matrix is of a metallic material or a non-transparent organic conductive material.

5 . The array substrate according to claim 1 , wherein the array substrate comprises a plurality of pixel units and each pixel unit comprises the thin film transistor, the electrode structure and the black matrix; and wherein each pixel unit comprises a display region and a non-display region, the thin film transistor is located in the non-display region, a part of the electrode structure is disposed on the thin film transistor, and the other part of the electrode structure is located in the display region.

6 . The array substrate according to claim 1 , further comprising a color filter located between the thin film transistor and the electrode structure as an insulating layer.

7 . The array substrate according to claim 1 , further comprising a color filter located between the pixel electrode and the common electrode as an insulating layer.

8 . A display device comprising an array substrate according to claim 1 .

9 . A manufacturing method of an array substrate, comprising:
a step of forming a thin film transistor on a base substrate; a step of forming an electrode structure, wherein the electrode structure comprises a pixel electrode and a common electrode insulated from each other; a step of forming a black matrix, wherein an orthographic projection of the thin film transistor on the base substrate is located within an orthographic projection of the black matrix on the base substrate, and the black matrix is directly electrically connected to the common electrode for providing common electrode signals to the common electrode.

10 . The manufacturing method according to claim 9 , wherein the step of forming the electrode structure and the step of forming the black matrix comprise:
forming a pixel electrode on the thin film transistor; forming a common electrode which is insulated from the pixel electrode on the pixel electrode; forming a black matrix on the common electrode.

11 . The manufacturing method according to claim 10 , wherein forming the common electrode which is insulated from the pixel electrode on the pixel electrode and forming the black matrix on the common electrode comprise:
forming the common electrode and the black matrix by one patterning process.

12 . The manufacturing method according to claim 11 , wherein forming the common electrode and the black matrix by one patterning process comprises:
successively forming a thin film for the common electrode and a thin film for the black matrix; applying photoresist on the thin film for the black matrix, exposing and developing the photoresist by using a mask, and obtaining a photoresist-completely-removed region, a photoresist-partially-retained region and a photoresist-completely-retained region, wherein the photoresist-partially-retained region corresponds to a region for forming the common electrode and the photoresist-completely-retained region corresponds to a region for forming the black matrix; etching the photoresist-completely-removed region, the photoresist-partially-retained region and the photoresist-completely-retained region to form the common electrode and the black matrix.

13 . The manufacturing method according to claim 12 , wherein the mask is a half-tone mask or a gray-tone mask.

14 . The manufacturing method according to claim 12 , wherein etching the photoresist-completely-removed region, the photoresist-partially-retained region and the photoresist-completely-retained region to form the common electrode and the black matrix comprises:
performing an etching process to etch off the thin film for the common electrode and the thin film for the black matrix of the photoresist-completely-removed region, and obtaining the common electrode; performing an ashing process on the photoresist to remove the photoresist in the photoresist-partially-retained region; performing an etching process to etch off the thin film for the black matrix in the photoresist-partially-retained region, removing the photoresist in the photoresist-completely-retained region and obtaining the black matrix.

15 . The manufacturing method according to claim 9 , wherein the black matrix is formed of a metallic material or a non-transparent organic conductive material.

16 . The manufacturing method according to claim 10 , wherein after forming the thin film transistor and before forming the pixel electrode, the method further comprises: forming a color filter serving as an insulating layer on the thin film transistor.

17 . The manufacturing method according to claim 9 , wherein after forming the pixel electrode and before forming the common electrode, the method further comprises: forming a color filter serving as an insulating layer on the pixel electrode.

18 . The array substrate according to claim 2 , wherein the black matrix is of a metallic material or a non-transparent organic conductive material.

19 . The array substrate according to claim 2 , wherein the array substrate comprises a plurality of pixel units and each pixel unit comprises the thin film transistor, the electrode structure and the black matrix; and wherein each pixel unit comprises a display region and a non-display region, the thin film transistor is located in the non-display region, a part of the electrode structure is disposed on the thin film transistor, and the other part of the electrode structure is located in the display region.

20 . The array substrate according to claim 2 , further comprising a color filter located between the thin film transistor and the electrode structure as an insulating layer.

Assignees

• Boe Technology Group Co Ltd

Inventors

• Niu Jing

Classifications

• H10W20/067

  by modifying the pattern of conductive parts · CPC title

• H10W20/077 Primary

  on sidewalls or on top surfaces of conductors (H10W20/076 takes precedence) · CPC title

• G02F1/1368

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

• G02F1/136209 Primary

  Light shielding layers, e.g. black matrix, incorporated in the active matrix substrate, e.g. structurally associated with the switching element · CPC title

• G02F1/134309

  characterised by their geometrical arrangement · CPC title