Thin film transistor array substrate, method for fabricating the same and display device

• US 10,128,272 B2
• Filed: 04/28/2014
• Issued: 11/13/2018
• Est. Priority Date: 01/08/2014
• Status: Active Grant

• Current Assignee: Beijing BOE Optoelectronics Technology Co Ltd. (BOE Technology Group Co., Ltd.), BOE Technology Group Co., Ltd.
• Original Assignee: Beijing BOE Optoelectronics Technology Co Ltd. (BOE Technology Group Co., Ltd.), BOE Technology Group Co., Ltd.
• Inventors: Zhang, Jiaxiang, Guo, Jian, Jiang, Xiaohui, Yan, Changjiang
• Primary Examiner(s): Malsawma, Lex
• Application Number:
  US14/421,279
• Publication Number:
  US 20150311224A1
• Time in Patent Office: 1,660 Days
• CPC Class Codes: G02F 1/133555 Transflectors
• CPC Class Codes: G02F 1/134318 having a patterned common electrode
• CPC Class Codes: G02F 1/134363 for applying an electric field parallel to the substrate, i.e. in-plane switching [IPS]
• CPC Class Codes: H01L 21/84 the substrate being other than a semiconductor body, e.g. being an insulating body
• CPC Class Codes: H01L 27/12 the substrate being other than a semiconductor body, e.g. an insulating body
• CPC Class Codes: H01L 27/124 with a particular composition, shape or layout of the wiring layers specially adapted to the circuit arrangement, e.g. scanning lines in LCD pixel circuits wiring structures per se H01L23/52
• CPC Class Codes: H01L 27/1259 Multistep manufacturing methods
• CPC Class Codes: H01L 27/1262 with a particular formation, treatment or coating of the substrate

Abstract

Disclosed are a TFT array substrate, a method for fabricating the same and a display device. The TFT array substrate includes a plurality of pixel units, each of the plurality of pixel units includes a common electrode (9). The common electrode (9), is comb-shaped, and includes a plurality of strip electrodes and a plurality of slits. Each of the strip electrodes is configured for reflecting light incident on the strip electrode, and each of the slits is configured for transmitting light incident on the slit. As the comb-shaped common electrode with both a reflective region and a transmissive region is formed through a single patterning process, the fabrication process is simplified and the fabrication cost and difficulty are reduced.

Claims

1. A TFT array substrate, comprising:

a plurality of pixel units, each of the plurality of pixel units comprising a common electrode, wherein the common electrode is comb-shaped, and the common electrode comprises a plurality of strip electrodes and a plurality of slits, wherein each of the strip electrodes is configured for reflecting light incident on the strip electrode, and each of the slits is configured for transmitting light incident on the slit, and all of the plurality of strip electrodes and the plurality of slits are extended in one and the same direction in each pixel unit;

wherein the TFT array substrate further comprises a plurality of gate signal lines and a plurality of data signal lines disposed as intersecting each other, the slits are disposed obliquely as having an angle with the gate signal lines, and the angle is greater than 0 and smaller than 90 degrees.

2. The TFT array substrate of claim 1, wherein a material of the strip electrodes is a metal with a resistivity equal to or less than 50 Ω

/cm2 and has reflective property.

3. The TFT array substrate of claim 2, wherein the material of the strip electrodes is aluminum or titanium.

4. The TFT array substrate of claim 1, wherein the plurality of strip electrodes are of a same width.

5. The TFT array substrate of claim 1, wherein the plurality of slits are of a same width.

6. The TFT array substrate of claim 1, wherein a ratio between a total area of the plurality of strip electrodes and that of the plurality of slits is 3:

5.

7. A display device, comprising the TFT array substrate of claim 1.

8. A method for fabricating a TFT array substrate, wherein the TFT array substrate comprises a comb-shaped common electrode, the method comprising:

forming a pattern of the comb-shaped common electrode through a single patterning process, wherein the comb-shaped common electrode comprises a plurality of strip electrodes and a plurality of slits, each of the strip electrodes is configured for reflecting light incident on the strip electrode, and each of the slits is configured for transmitting light incident on the slit;

wherein all of the plurality of strip electrodes and the plurality of slits are extended in one and the same direction in each pixel unit;

the method further comprising forming a plurality of gate signal lines and a plurality of data signal lines disposed as intersecting each other, wherein the slits are disposed obliquely as having an angle with the gate signal lines, and the angle is greater than 0 and smaller than 90 degrees.

9. The method of claim 8, further comprising:

providing a base substrate;

forming a gate electrode on the base substrate;

forming a gate insulation layer, an active layer and an etch stop layer on the base substrate having the gate electrode formed thereon;

forming a source/drain electrode on the base substrate having the etch stop layer formed thereon;

forming a pixel electrode on the base substrate having the source/drain electrode formed thereon; and

forming an insulation protection layer on the base substrate having the pixel electrode formed there on;

wherein the common electrode is formed on the insulation protection layer.