IN-CELL TOUCH PANEL AND DISPLAY DEVICE

• US 20160274715A1
• Filed: 09/20/2014
• Published: 09/22/2016
• Est. Priority Date: 05/30/2014
• 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: WANG, Lei, DONG, Xue, XUE, Hailin, WANG, Haisheng, LIU, Yingming, YANG, Shengji, LIU, Hongjuan, DING, Xiaoliang, ZHAO, Weijie, WANG, Chunlei, LI, Yue
• Granted Patent: US 9,678,594 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: G02F 1/13 based on liquid crystals, e.g. single liquid crystal display cells
• CPC Class Codes: G02F 1/133 Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements arrangements or circuits for control of liquid crystal elements in a matrix, not structurally associated with these elements G09G3/36
• CPC Class Codes: G02F 1/1333 Constructional arrangements; Manufacturing methodsG02F1/135, G02F1/136 take precedence
• 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 1/134345 Subdivided pixels, e.g. for grey scale or redundancy
• CPC Class Codes: G02F 1/134372 for fringe field switching [FFS] where the common electrode is not patterned
• CPC Class Codes: G02F 1/13439 characterised by their electrical, optical, physical properties; materials therefor; method of making
• 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: G06F 2203/04103 Manufacturing, i.e. details related to manufacturing processes specially suited for touch sensitive devices
• CPC Class Codes: G06F 2203/04111 Cross over in capacitive digitiser, i.e. details of structures for connecting electrodes of the sensing pattern where the connections cross each other, e.g. bridge structures comprising an insulating layer, or vias through substrate
• 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 3/041 Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
• 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 3/0443 using a single layer of sensing electrodes
• CPC Class Codes: G06F 3/046 by electromagnetic means
• CPC Class Codes: G09G 2300/0809 Several active elements per pixel in active matrix panels
• CPC Class Codes: G09G 2310/0202 : Addressing of scan or signal lines
• CPC Class Codes: G09G 2354/00 : Aspects of interface with display user
• CPC Class Codes: G09G 3/006 : Electronic inspection or testing of displays and display drivers, e.g. of LED or LCD displays testing individual LED's G01R31/2635; testing lamps G01R31/44; testing of optical features of LCD displays G02F1/1309
• CPC Class Codes: G09G 3/3648 : using an active matrix G09G3/367 - G09G3/3696 take precedence
• CPC Class Codes: G09G 3/3677 : suitable for active matrices only
• CPC Class Codes: G09G 3/3688 : suitable for active matrices only

Abstract

An in-cell touch panel and a display device are disclosed, a common electrode layer is reused as self-capacitance electrodes in accordance with self-capacitance principle. A pattern of common electrode layer is designed such that the common electrode layer is partitioned into a plurality of mutually independent self-capacitance electrodes along strip-like slits and a direction crossing the slits. The touch sensing chip can determine a touch position by detecting capacitance value variation of self-capacitance electrodes in a touch period. The in-cell touch panel can save production costs and improve production efficiency, and also can avoid light leakage caused by cutting common electrode layer and influence on display effect.

Claims

1. An in-cell touch panel comprising:

a first substrate and a second substrate disposed oppositely to each other, a common electrode layer comprising a plurality of strip-like slits disposed on a side of the second substrate, which side faces the first substrate, and a touch sensing chip;

wherein

the common electrode layer comprises a plurality of mutually independent self-capacitance electrodes distributed along the strip-like slits and a direction crossing the strip-like slits; and

the touch sensing chip is configured to apply common electrode signals to the self-capacitance electrodes in a display time period and determine touch positions by detecting capacitance value variation of self-capacitance electrodes in a touch time period.

2. The in-cell touch panel of claim 1, further comprising:

a black matrix layer disposed on a side of the first substrate, which side faces the second substrate, or on a side of the second substrate, which side faces the first substrate; and

in the common electrode layer, orthogonal projections of partitioning gaps in the direction crossing the strip-like slits on the second substrate are all within regions in which a pattern of the black matrix layer is located.

3. The in-cell touch panel of claim 2, further comprising:

a plurality of wires connecting the self-capacitance electrodes to the touch sensing chip.

4. The in-cell touch panel of claim 3, wherein the wires and the self-capacitance electrodes are disposed on different layers.

5. The in-cell touch panel of claim 3, wherein orthogonal projections of patterns of the wires on the second substrate are located in the region where the pattern of the black matrix layer is located.

6. The in-cell touch panel of claim 4, further comprising:

pixel electrodes disposed between the second substrate and the common electrode layer;

wherein a layer where the wires are located is disposed between the pixel electrodes and the common electrode layer or on a same layer as the pixel electrodes.

7. The in-cell touch panel of claim 4, further comprising:

gate signal lines and data signal lines crossing each other and disposed on a side of the second substrate, which side faces the first substrate;

wherein adjacent two gate signal lines and data signal lines enclose a pixel; and

an extension direction of the wires is same as that of the gate signal lines or the data signal lines.

8. The in-cell touch panel of claim 7, wherein every two adjacent rows of pixels constitute a pixel group and two gate signal lines for providing gate scanning signals respectively for these two rows of pixels are provided between these two rows of pixels;

and

the wires are disposed at gaps between adjacent pixel groups and on a same layer as the gate signal lines.

9. The in-cell touch panel of claim 7, wherein two gate signal lines are provided between adjacent rows of pixels;

and every two adjacent columns of pixels as one pixel group share one data signal line between these two columns of pixels; and

the wires are disposed at gaps between adjacent pixel groups and on a same layer as the data signal lines.

10. The in-cell touch panel of claim 1, wherein opposite sides of adjacent two of self-capacitance electrodes are both configured as bend ones.

11. The in-cell touch panel of claim 10, wherein the sides that are bend lines are of step-like structures such that two step-like structures are consistent and matching each other.

12. The in-cell touch panel of claim 10, wherein the sides that are bend lines are of concave-convex structures such that two concave-convex structures are consistent and matching each other.

13. A display device comprising the in-cell touch panel of claim 1.

14. The in-cell touch panel of claim 4, wherein orthogonal projections of patterns of the wires on the second substrate are located in the region where the pattern of the black matrix layer is located.

15. The in-cell touch panel of claim 2, wherein opposite sides of adjacent two of self-capacitance electrodes are both configured as bend lines.

16. The in-cell touch panel of claim 15, wherein the skies that are bend lines are of step-like structures such that two step-like structures are consistent and matching each other.

17. The in-cell touch panel of claim 16, wherein the skies that are bend lines are of concave-convex structures such that two concave-convex structures are consistent and matching each other.

18. The in-cell touch panel of claim 3, wherein opposite sides of adjacent two of self-capacitance electrodes are both configured as bend lines.

19. The in-cell touch panel of claim 18, wherein the sides that are bend lines are of step-like structures such that two step-like structures are consistent and matching each other.

20. The in-cell touch panel of claim 19, wherein the sides that are bend lines are of concave-convex structures such that two concave-convex structures are consistent and matching each other.