Capacitive incell touch panel and display apparatus

• US 9,250,736 B2
• Filed: 10/25/2013
• Issued: 02/02/2016
• Est. Priority Date: 10/26/2012
• Status: Active Grant

• Current Assignee: Beijing BOE Optoelectronics Technology Co Ltd. (BOE Technology Group Co., Ltd.)
• Original Assignee: Beijing BOE Optoelectronics Technology Co Ltd. (BOE Technology Group Co., Ltd.)
• Inventors: Wang, Haisheng, Dong, Xue, Ding, Xiaoliang, Liu, Hongjuan, Yang, Shengji, Zhao, Weijie, Liu, Yingming, Ren, Tao
• Primary Examiner(s): Patel, Sanjiv D
• Application Number:
  US14/063,216
• Publication Number:
  US 20140118299A1
• Time in Patent Office: 830 Days
• US Class Current: 1/1
• 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 3/04184 Synchronisation with the driving of the display or the backlighting unit to avoid interferences generated internally
• 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: G09G 3/3648 using an active matrix G09G3/367 - G09G3/3696 take precedence

Abstract

The present disclosure provides a capacitive in-cell touch panel and a display apparatus, wherein touch sensing electrodes are set on a color filter substrate, a common electrode layer connected as a whole plane on a TFT array substrate is divided into strips to be used as touch driving electrodes, and metal driving electrodes directly electrically connected to the corresponding touch driving electrodes are set on the TFT array substrate so as to reduce resistance of the touch driving electrodes. The embodiments of the disclosure can save the production cost and improve the production efficiency. Moreover, the touch function and the display function are driven in a time division manner, and thus the production cost can be further reduced, and the picture quality and touch accuracy can be enhanced.

Claims

1. A capacitive in-cell touch panel including:

a color filter substrate, a thin film transistor (TFT) array substrate having a common electrode layer, and a liquid crystal layer between the color filter substrate and the TFT array substrate, wherein a plurality of pixel units arranged in a matrix are arranged on the TFT array substrate;

wherein, the common electrode layer is divided into a plurality of touch driving electrodes and common electrodes extending along a direction of row of the pixel units, the common electrodes are insulated from the touch driving electrodes and at least one common electrode is arranged between two adjacent touch driving electrodes;

the color filter substrate has a plurality of touch sensing electrodes, each of which is extended along the direction of columns of the pixel units;

during a display period of a frame of picture, each of the touch driving electrodes is used to transmit a common electrode signal and a touch scanning signal in a time division manner, and the common electrode only transmits the common electrode signal;

the TFT array substrate has a plurality of metal driving electrodes, each of which is extended along the direction of rows of the pixel units;

each of the metal driving electrodes is located in a gap between adjacent pixel units and is directly electrically connected to a corresponding touch driving electrode.

2. The touch panel of claim 1, wherein each of the touch driving electrodes covers a plurality of pixel units.

3. The touch panel of claim 2, wherein the metal driving electrodes are located in a layer positioning at least one of:

(1) above the touch driving electrodes and (2) below the touch driving electrodes.

4. The touch panel of claim 3, wherein each of the metal driving electrodes includes at least one horizontal metal sub-electrode and at least one vertical metal sub-electrode;

in the region covered by the touch driving electrode corresponding to the metal driving electrode, the horizontal metal sub-electrode is located at a gap between adjacent rows of pixel units, and the vertical metal sub-electrode is located at a gap between adjacent columns of pixel units.

5. The touch panel of claim 4, further including metal dummy electrodes arranged in a same layer as the metal driving electrodes, wherein the metal dummy electrodes are located at the gaps between adjacent touch driving electrodes, and are used for transmitting the common electrode signal.

6. The touch panel of claim 1, wherein two gate signal lines are arranged between adjacent rows of pixel units on the TFT array substrate, and two adjacent columns of pixel units belong to a group of pixel units and commonly use a same data signal line between the two adjacent columns of pixel units.

7. The touch panel of claim 6, wherein the common electrode signal lines arranged in a same layer as the data signal lines are arranged at gaps between adjacent groups of pixel units;

and the common electrode signal lines are electrically connected to the corresponding touch driving electrodes through via-holes respectively.

8. The touch panel of claim 1, wherein each of the touch driving electrodes or the common electrodes has a slit-shaped ITO electrode structure at the position corresponding to the aperture region of the pixel unit, and the touch driving electrode and the common electrode are located above the pixel electrodes in the TFT array substrate.

9. The touch panel of claim 8, wherein a resin material insulating layer is set between the common electrode layer and the data signal lines in the TFT array substrate.

10. The touch panel of claim 1, wherein the touch sensing electrodes are located between a supporting base of the color filter substrate and a color resin layer of the color filter substrate, or are located on one side of the color resin layer of the color filter substrate facing the liquid crystal layer.

11. The touch panel of claim 10, wherein each of the touch sensing electrodes includes at least one vertical sensing sub-electrode, and the at least one vertical sensing sub-electrode has a projection on the TFT array substrate which is located between adjacent columns of pixel units.

12. The touch panel of claim 11, wherein each of the touch sensing electrodes further includes at least one horizontal sensing sub-electrode, and the at least one horizontal sensing sub-electrodes has a projection on the TFT array substrate which is located between adjacent rows of pixel units, and the respective vertical sensing sub-electrodes in the same sensing electrode are connected to each other by the horizontal sensing sub-electrodes.

13. The touch panel of claim 11, wherein the touch sensing electrodes are transparent conductive Oxide electrodes or metal electrodes.

14. A display apparatus including the capacitive in-cell touch panel of claim 1.