Array substrate with conductive black matrix, manufacturing method thereof and display device

• US 10,338,444 B2
• Filed: 04/07/2016
• Issued: 07/02/2019
• Est. Priority Date: 06/19/2015
• Status: Active Grant

• Current Assignee: BOE Technology Group Co., Ltd.
• Original Assignee: BOE Technology Group Co., Ltd.
• Inventors: Zhang, Feng, Cao, Zhanfeng, Yao, Qi
• Primary Examiner(s): Hall, Victoria K.
• Application Number:
  US15/314,695
• Publication Number:
  US 20170184931A1
• Time in Patent Office: 1,181 Days
• CPC Class Codes: G02F 1/133308 Support structures for LCD panels, e.g. frames or bezels
• CPC Class Codes: G02F 1/133345 Insulating layers G02F1/1335, G02F1/1337, G02F1/135, G02F1/136 take precedence
• CPC Class Codes: G02F 1/133354 Arrangements for aligning or assembling substrates
• 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 1/13398 Spacer materials; Spacer properties
• CPC Class Codes: G02F 1/134309 characterised by their geometrical arrangement
• CPC Class Codes: G02F 1/134372 for fringe field switching [FFS] where the common electrode is not patterned
• 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 1/13606 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 1/136222 Colour filters incorporated in the active matrix substrate
• CPC Class Codes: G02F 1/136286 Wiring, e.g. gate line, drain line
• CPC Class Codes: G02F 2201/121 common or background
• CPC Class Codes: G02F 2201/123 pixel
• CPC Class Codes: G02F 2201/40 Arrangements for improving the aperture ratio
• CPC Class Codes: G02F 2202/16 conductive

Abstract

An array substrate and a manufacturing method thereof and a display device are disclosed. The array substrate includes a base substrate, and a color filter layer, a common electrode and a black matrix disposed on the base substrate, the black matrix is capable of conducting electricity, and the black matrix is electrically connected with the common electrode. The array substrate can reduce parasitic capacitance, and decrease power consumption.

Claims

1. A display device comprising an array substrate, the array substrate comprising a base substrate, and a color filter layer, a common electrode and a black matrix disposed on the base substrate, wherein the black matrix is capable of conducting electricity, and the black matrix is electrically connected with the common electrode;

wherein the display device further comprises an opposing substrate opposite to the array substrate, and the opposing substrate comprises a transparent substrate and a spacer located on a surface of the transparent substrate facing to the array substrate, wherein the spacer is configured to support the opposing substrate to retain a gap between the array substrate and the opposing substrate,

wherein the black matrix is closer to the base substrate than the common electrode, and the black matrix comprises a conductive sub-layer and a light absorbing sub-layer,

wherein the light absorbing sub-layer is closer to the base substrate than the conductive sub-layer, and an electricity conducting property of the light absorbing sub-layer is less than that of the conductive sub-layer, and

wherein a material of the conductive sub-layer comprises molybdenum, silver, aluminum-neodymium alloy or molybdenum-titanium alloy, and a material of the light absorbing sub-layer comprises molybdenum-tantalum alloy oxide, molybdenum-titanium alloy oxide, molybdenum-tantalum alloy nitride, or molybdenum-titanium alloy nitride.

2. The display device according to claim 1, wherein the black matrix is in contact with the common electrode.

3. The display device according to claim 2, wherein the conductive sub-layer is provided with a pattern of the black matrix.

4. The display device according to claim 3, wherein the conductive sub-layer is in contact with the common electrode.

5. The display device according to claim 3, wherein the light absorbing sub-layer is provided with the pattern of the black matrix.

6. The display device according to claim 1, further comprising a signal line disposed on the base substrate, wherein a projection of the common electrode on the base substrate covers a projection of the signal line on the base substrate.

7. The display device according to claim 6, wherein the signal line comprises at least one of a data line or a gate line.

8. The display device according to claim 1, further comprising a pixel electrode located on or below the common electrode, and an insulation dielectric layer located between the common electrode and the pixel electrode.

9. The display device according to claim 1, wherein the opposing substrate further comprises an alignment mark and a light shielding frame located on the surface of the transparent substrate facing to the array substrate;

and a display area of the display device is surrounded by the light shielding frame;

a material of the spacer, the alignment mark and the light shielding frame is a same black organic insulation material.

10. The display device according to claim 9, wherein the black organic insulation material comprises red resin, green resin and blue resin;

or the black organic insulation material comprises a black resin with light absorbing property;

or the black organic insulation material comprises a resin and carbon particles, and the carbon black particles are enclosed by the resin.

11. The display device according to claim 9, wherein a dielectric coefficient of the black organic insulation material is less than 5, a sheet resistance is greater than 1.0×

10¹⁴Ω

/□

, a voltage maintenance ratio is greater than 85%, or an optical density value is in a range of 1.0-2.0/μ

m.

12. A manufacturing method of a display device, comprising:

forming an array substrate comprising forming a color filter layer, a common electrode, and a black matrix on a base substrate, wherein the black matrix is capable of conducting electricity, and the black matrix is electrically connected with the common electrode;

assembling the array substrate with an opposing substrate, wherein the opposing substrate is opposite to the array substrate, and the opposing substrate comprises a transparent substrate and a spacer located on a surface of the transparent substrate facing to the array substrate, wherein the spacer is configured to support the opposing substrate to retain a gap between the array substrate and the opposing substrate,

wherein the black matrix is closer to the base substrate than the common electrode, and the black matrix comprises a conductive sub-layer and a light absorbing sub-layer,

wherein the light absorbing sub-layer is closer to the base substrate than the conductive sub-layer, and an electricity conducting property of the light absorbing sub-layer is less than that of the conductive sub-layer, and

wherein a material of the conductive sub-layer comprises molybdenum, silver, aluminum-neodymium alloy or molybdenum-titanium alloy, and a material of the light absorbing sub layer comprises molybdenum-tantalum alloy oxide, molybdenum-titanium alloy oxide, molybdenum-tantalum alloy nitride molybdenum-titanium alloy nitride.

13. The manufacturing method of the display device according to claim 12, further comprising forming a signal line, wherein a projection of the common electrode on the base substrate covers a projection of the signal line on the base substrate.

14. The manufacturing method of the display device according to claim 13, wherein the signal line comprises at least one of a data line or a gate line.

15. The manufacturing method of the display device according to claim 12, wherein the black matrix is in contact with the common electrode.