CAPACITIVE IN-CELL TOUCH-SCREEN PANEL, TOUCH-POSITIONING METHOD, AND DISPLAY DEVICE

• US 20140111471A1
• Filed: 11/08/2012
• Published: 04/24/2014
• Est. Priority Date: 06/29/2012
• Status: Active Grant

• Current Assignee: BOE Technology Group Co., Ltd.
• Original Assignee: BOE Technology Group Co., Ltd.
• Inventors: Zhao, Jiayang
• Granted Patent: US 9,436,323 B2
• Time in Patent Office: Days
• US Class Current: 345/174
• CPC Class Codes: G02F 1/133334 Electromagnetic shields
• CPC Class Codes: G02F 1/13338 Input devices, e.g. touch panels
• 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 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 3/0446 using a grid-like structure of electrodes in at least two directions, e.g. using row and column electrodes

Abstract

The present invention discloses a capacitive in-cell touch-screen panel, a touch-positioning method thereof, and a display device. At least one of the gate lines in a TFT array substrate is elected as a touch scanning line, and at least one of the data lines is elected as a touch sensing line; or contrarily, at least one of the data lines is elected as a touch scanning line, and at least one of the gate lines is elected as a touch sensing line, and in this way the function of the touch-screen panel is achieved. Because the gate lines and data lines in a TFT array substrate are used as touch scanning lines and touch sensing lines, there is no need to add additional wirings, and thus the aperture ratio of the TFT array substrate will not be reduced.

Claims

1. A capacitive in-cell touch-screen panel, comprising:

a thin film transistor (TFT) array substrate comprising data lines and gate lines;

at least one of the gate lines is elected as a touch scanning line, and at least one of the data lines is elected as a touch sensing line;

alternatively, at least one of the data lines is elected as a touch scanning line, and at least one of the gate lines is elected as a touch sensing line;

wherein,

the touch scanning line is used to transmit a touch scan signal;

the touch sensing line is used to obtain a voltage signal which is formed through coupling with the touch scan signal via an inductive capacitor and output the voltage signal;

the inductive capacitor is formed at a non-coplanar intersection between the touch scanning line and the touch sensing line.

2. The touch-screen panel according to claim 1, wherein the touch scanning lines are spaced at an equal interval, and the touch sensing lines are spaced at an equal interval.

3. The touch-screen panel according to claim 2, wherein the interval between the touch scanning lines is the same as the interval between the touch sensing lines.

4. The touch-screen panel according to claim 1, further comprising:

a color-filter substrate, provided above the TFT array substrate and in the same size as the TFT array substrate;

the color-filter substrate comprises a metallic layer on the side facing away the TFT array substrate for shielding an external electric field; and

the metallic layer is distributed in a region other than the corresponding region of the inductive capacitor.

5. The touch-screen panel according to claim 1, further comprising:

a touch signal receiver, connected with the touch sensing line, and used to receive the voltage signal output from the touch sensing line.

6. The touch-screen panel according to claim 5, further comprising:

a touch switch element, provided between the touch sensing line and the touch signal receiver, and configured to switch on the connection between the touch sensing line and the touch signal receiver after the touch scan signal transmitted by the touch scanning line completes discharging of pixels, and to switch off the connection between the touch sensing line and the touch signal receiver when the touch scan signal transmitted by the touch scanning line charges pixels.

7. The touch-screen panel according to claim 6, further comprising:

a display driver, connected with the touch sensing line; and

a driver switch element, and provided between the touch sensing line and the display driver;

the display driver is used to load a display drive signal to the touch sensing line; and

the driver switch element is configured to switch off the connection between the touch sensing line and the display driver after the touch scan signal transmitted by the touch scanning line completes discharging of pixels, and to switch on the connection between the touch sensing line and the display driver when the touch scan signal transmitted by the touch scanning line charges pixels.

8. The touch-screen panel according to claim 7, wherein the touch switch element is provided within the touch signal receiver, or provided at the connection site of the touch sensing line and the touch signal receiver;

and

the driver switch element is provided within the display driver, or provided at an connection site of the touch sensing line and the display driver.

9. The touch-screen panel according to claim 6, wherein the touch switch element is a TFT.

10. A display device, comprising a capacitive in-cell touch-screen panel in accordance with claim 1.

11. A touch-positioning method, based on a capacitive in-cell touch-screen panel in accordance with claim 1, comprising:

loading a touch scan signal to the touch scanning line provided in the touch-screen panel;

obtaining and detecting a voltage signal, which are formed through coupling with the touch scan signal via an inductive capacitor, by the touch sensing line; and

determining a position of a touching point on the touch-screen panel based on a change of the detected voltage signal and a position of the inductive capacitor.

12. The touch-screen panel according to claim 7, wherein the driver switch element is a TFT.