TFT array substrate and LCD

• US 10,600,811 B2
• Filed: 09/19/2018
• Issued: 03/24/2020
• Est. Priority Date: 04/20/2018
• Status: Active Grant

• Current Assignee: Wuhan China Star Optoelectronics Technology Co., Ltd. (TCL Technology Group Corp.)
• Original Assignee: Wuhan China Star Optoelectronics Technology Co., Ltd. (TCL Technology Group Corp.)
• Inventors: Gao, Ling, Yu, Xiaojiang
• Primary Examiner(s): Chang, Charles S
• Application Number:
  US16/097,276
• Publication Number:
  US 20190326331A1
• Time in Patent Office: 552 Days
• Field of Search: 349149-152, 349158
• CPC Class Codes: G02F 1/1341 Filling or closing of cells
• CPC Class Codes: G02F 1/1362 Active matrix addressed cells G02F1/134336, G02F1/134363 take precedence
• CPC Class Codes: G02F 1/136222 Colour filters incorporated in the active matrix substrate
• CPC Class Codes: G02F 1/136277 formed on a semiconductor substrate, e.g. of silicon
• CPC Class Codes: H01L 27/1218 with a particular composition or structure of the substrate

Abstract

The invention provides a TFT array substrate and LCD panel. The TFT array substrate adopts a Notch design, with a base substrate disposed with a groove at one end. The base substrate comprises a functional area and a peripheral area located outside the functional area, and the planarization layer on the base substrate has a first portion corresponding to the functional area, wherein the first portion adjacent to the groove is provided with at least one pit, and the depth of the pit is smaller than the thickness of the first portion. When the TFT array substrate and the CF substrate are assembled, after the LC is injected between TFT array substrate and CF substrate, the LC accumulation generated in the first portion of the planarization layer near the groove during diffusion is in the pit, thereby making the LC layer thickness uniform and improved quality of LCD panel.

Claims

1. A thin film transistor (TFT) array substrate, comprising:

a base substrate and a planarization layer disposed on the base substrate;

one end of the base substrate being provided with a groove, the base substrate comprising a functional area and a peripheral area located outside the functional area;

the planarization layer has a first portion corresponding to the functional area of the base substrate;

a portion of the first portion adjacent to the groove being disposed with at least one pit;

the pit having a depth less than the thickness of the first portion;

wherein the planarization layer is formed with a notch that corresponds to the groove of the base substrate and the portion of the first portion of the planarization layer is adjacent to the notch, wherein the pit that is formed in the portion of the first portion of the planarization layer is adjacent to the notch of the planarization layer.

2. The TFT array substrate as claimed in claim 1, wherein in a cross-section of the planarization layer, area occupied by the pits per unit area where the first portion is disposed with the pits gradually increases towards the direction of the groove.

3. The TFT array substrate as claimed in claim 2, wherein the number of pits per unit area in region of the first portion adjacent to the groove is greater than the number of pits per unit area in region of the first portion away from the groove.

4. The TFT array substrate as claimed in claim 2, wherein an inner diameter of the pit in the region of the first portion adjacent the groove is larger than an inner diameter of the pit in the region of the first portion away from the groove.

5. The TFT array substrate as claimed in claim 3, wherein the first portion is disposed with N rows of pits adjacent to the groove, and distance between the plurality of pits and the groove in each row of pits is the same, wherein N is a positive integer;

spacing between two adjacent pits in each row of pits is equal.

6. The TFT array substrate as claimed in claim 5, wherein 3≤

N≤

5.

7. The TFT array substrate as claimed in claim 1, wherein the depth of the pit is 0.5-3 um.

8. The TFT array substrate as claimed in claim 1, wherein the end of the base substrate disposed with the groove comprises a first sidewall, a second sidewall, a third sidewall, a fourth sidewall and a fifth sidewall, sequentially connected;

the first sidewall and the fifth sidewall are in the same plane, the second sidewall, the third sidewall, and the fourth sidewall collectively form the groove.

9. The TFT array substrate as claimed in claim 8, wherein the first sidewall is perpendicular to the second sidewall, the second sidewall is perpendicular to the third sidewall, and the third sidewall is perpendicular to the fourth sidewall.

10. A liquid crystal display (LCD) panel, comprising:

a TFT array substrate as claimed in claim 1 and a CF substrate disposed opposite to each other, and an LC layer disposed between the TFT array substrate and the CF substrate;

a portion of the LC layer being housed in the pit.