COA array substrate and display device

• US 10,274,793 B2
• Filed: 12/14/2016
• Issued: 04/30/2019
• Est. Priority Date: 09/29/2016
• Status: Active Grant

• Current Assignee: Shenzhen China Star Optoelectronics Technology Co., Ltd. (TCL Technology Group Corp.)
• Original Assignee: Shenzhen China Star Optoelectronics Technology Co., Ltd. (TCL Technology Group Corp.)
• Inventors: Du, Peng
• Primary Examiner(s): Edwards, Mark
• Application Number:
  US15/323,975
• Publication Number:
  US 20180164647A1
• Time in Patent Office: 867 Days
• Field of Search: 345174
• CPC Class Codes: G02F 1/133305 Flexible substrates, e.g. plastics, organic film
• CPC Class Codes: G02F 1/133345 Insulating layers G02F1/1335, G02F1/1337, G02F1/135, G02F1/136 take precedence
• CPC Class Codes: G02F 1/13338 Input devices, e.g. touch panels
• CPC Class Codes: G02F 1/133512 Light shielding layers, e.g. black matrix G02F1/136209 takes precedence
• CPC Class Codes: G02F 1/134309 characterised by their geometrical arrangement
• CPC Class Codes: G02F 1/134336 Matrix
• CPC Class Codes: G02F 1/136204 Arrangements to prevent high voltage or static electricity failures
• CPC Class Codes: G02F 1/136218 Shield electrodes
• 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 1/1368 in which the switching element is a three-electrode device G02F1/136277 takes precedence
• CPC Class Codes: G02F 2201/121 common or background
• CPC Class Codes: G02F 2201/122 having a particular pattern
• CPC Class Codes: G02F 2201/123 pixel
• CPC Class Codes: G02F 2201/40 Arrangements for improving the aperture ratio
• CPC Class Codes: G06F 2203/04103 Manufacturing, i.e. details related to manufacturing processes specially suited for touch sensitive devices
• CPC Class Codes: G06F 2203/04107 Shielding in digitiser, i.e. guard or shielding arrangements, mostly for capacitive touchscreens, e.g. driven shields, driven grounds
• CPC Class Codes: G06F 2203/04112 Electrode mesh in capacitive digitiser: electrode for touch sensing is formed of a mesh of very fine, normally metallic, interconnected lines that are almost invisible to see. This provides a quite large but transparent electrode surface, without need for ITO or similar transparent conductive material
• CPC Class Codes: G06F 3/0412 Digitisers structurally integrated in a display
• CPC Class Codes: G06F 3/04166 Details of scanning methods, e.g. sampling time, grouping of sub areas or time sharing with display driving Synchronisation with the driving of the display or the backlighting unit to avoid interferences generated internally G06F3/04184
• CPC Class Codes: G06F 3/0445 : using two or more layers of sensing electrodes, e.g. using two layers of electrodes separated by a dielectric layer
• CPC Class Codes: G06F 3/0446 : using a grid-like structure of electrodes in at least two directions, e.g. using row and column electrodes
• 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 27/1244 : for preventing breakage, peeling or short circuiting
• CPC Class Codes: H01L 27/1248 : with a particular composition or shape of the interlayer dielectric specially adapted to the circuit arrangement

Abstract

The present disclosure provides a COA array substrate and a display device. The COA array substrate includes a plurality of gate lines; a plurality of data lines; and a plurality of pixel units. Each of the pixel units includes a pixel electrode and a common electrode. The common electrode includes a lower common electrode and an upper common electrode. The lower common electrode is disposed on one of the data lines, and the upper common electrode is disposed on one of the gate lines. The present disclosure solves a light leakage problem and problems that an aperture ratio and a transmittance are low in a liquid crystal panel.

Claims

1. A COA (color filter on array) array substrate, comprising:

a plurality of gate lines;

a plurality of data lines intersecting with the gate lines; and

a plurality of pixel units defined by the gate lines and the data lines, and each of the pixel units comprising a pixel electrode and a common electrode,

wherein the common electrode includes a lower common electrode and an upper common electrode which are positioned in different layers, the lower common electrode is disposed above and in alignment with when viewed above one of the data lines and has at least some common projection with when viewed above the one of the data lines, and the upper common electrode is disposed above and in alignment with when viewed above one of the gate lines and has at least some common projection with when viewed above the one of the gate lines,

wherein the lower common electrode is parallel with the data lines, and the upper common electrode is parallel with the gate lines,

wherein the upper common electrode is positioned in a same layer as the pixel electrode, a first predetermined horizontal distance is maintained between the upper common electrode and the pixel electrode, and the first predetermined horizontal distance prevents a short circuit between the upper common electrode and the pixel electrode,

wherein terminals of at least two of the lower common electrodes are connected together, and the at least two of the lower common electrodes are integrally formed as a sensing electrode,

terminals of at least two of the upper common electrodes are connected together, and the at least two of the upper common electrodes are integrally formed as a driving electrode,

a sensing capacitance is formed in an overlapping part of the sensing electrode and the driving electrode,

wherein a shielding structure is disposed between two adjacent ones of the sensing electrodes for preventing signals from interfering with each other, the shielding structure is a metal sheet, and the metal sheet is positioned in a same layer as the lower common electrode.

2. The COA array substrate of claim 1, wherein a second predetermined horizontal distance is maintained between each of vertical extending lines at two sides of the lower common electrode and the pixel electrode, and the second predetermined horizontal distance prevents an amount of capacitance that would be significant to a touch sensing function from being formed between the lower common electrode and the pixel electrode.

3. The COA array substrate of claim 1, wherein an insulating layer is disposed between the lower common electrode and the upper common electrode, the lower common electrode is covered by the insulating layer, and a color resist layer is disposed between one of the data lines and the lower common electrode.

4. The COA array substrate of claim 1, wherein the metal sheet and the lower common electrode are made of a same material.

5. The COA array substrate of claim 4, wherein the pixel electrode, the upper common electrode, and the metal sheet are manufactured in a same manufacturing step.

6. A COA (color filter on array) array substrate, comprising:

a plurality of gate lines;

a plurality of data lines intersecting with the gate lines; and

a plurality of pixel units defined by the gate lines and the data lines, and each of the pixel units comprising a pixel electrode and a common electrode,

wherein the common electrode includes a lower common electrode and an upper common electrode which are positioned in different layers, the lower common electrode is disposed above and in alignment with when viewed above one of the data lines and has at least some common projection with when viewed above the one of the data lines, and the upper common electrode is disposed above and in alignment with when viewed above one of the gate lines and has at least some common projection with when viewed above the one of the gate lines,

wherein terminals of at least two of the lower common electrodes are connected together, and the at least two of the lower common electrodes are integrally formed as a sensing electrode,

terminals of at least two of the upper common electrodes are connected together, and the at least two of the upper common electrodes are integrally formed as a driving electrode,

a sensing capacitance is formed in an overlapping part of the sensing electrode and the driving electrode,

wherein a shielding structure is disposed between two adjacent ones of the sensing electrodes for preventing signals from interfering with each other, the shielding structure is a metal sheet, and the metal sheet is positioned in a same layer as the lower common electrode.

7. The COA array substrate of claim 6, wherein the lower common electrode is parallel with the data lines, and the upper common electrode is parallel with the gate lines.

8. The COA array substrate of claim 6, wherein the upper common electrode is positioned in a same layer as the pixel electrode, a first predetermined horizontal distance is maintained between the upper common electrode and the pixel electrode, and the first predetermined horizontal distance prevents a short circuit between the upper common electrode and the pixel electrode.

9. The COA array substrate of claim 6, wherein a second predetermined horizontal distance is maintained between each of vertical extending lines at two sides of the lower common electrode and the pixel electrode, and the second predetermined horizontal distance prevents an amount of capacitance that would be significant to a touch sensing function from being formed between the lower common electrode and the pixel electrode.

10. The COA array substrate of claim 6, wherein an insulating layer is disposed between the lower common electrode and the upper common electrode, the lower common electrode is covered by the insulating layer, and a color resist layer is disposed between one of the data lines and the lower common electrode.

11. The COA array substrate of claim 6, wherein the metal sheet and the lower common electrode are made of a same material.

12. The COA array substrate of claim 11, wherein the pixel electrode, the upper common electrode, and the metal sheet are manufactured in a same manufacturing step.

13. A display device, comprising the COA array substrate of claim 6.