Integrated LCD touch screen to determine a touch position based on an induced voltage superimposed on both the scan signal of the gate line and a timing pulse of the signal line

• US 9,557,864 B2
• Filed: 04/28/2014
• Issued: 01/31/2017
• Est. Priority Date: 09/05/2008
• 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: Ryu, Jai-Il, Wang, Zheng
• Primary Examiner(s): Nguyen, Chanh
• Assistant Examiner(s): LINGARAJU, NAVIN B
• Application Number:
  US14/263,107
• Publication Number:
  US 20140232685A1
• Time in Patent Office: 1,009 Days
• Field of Search: 349/12
• US Class Current: 1/1
• CPC Class Codes: G02F 1/13338 Input devices, e.g. touch panels
• CPC Class Codes: G06F 3/0412 Digitisers structurally integrated in a display
• CPC Class Codes: G06F 3/044 by capacitive means
• CPC Class Codes: G06F 3/0443 using a single layer of sensing electrodes
• CPC Class Codes: G06F 3/0447 Position sensing using the local deformation of sensor cells
• CPC Class Codes: Y10T 29/49117 Conductor or circuit manufacturing

Abstract

The present invention provides an array substrate, a liquid crystal display device comprising the same, and a method for forming the same. The array substrate comprises a gate line, a data line, a signal line and a pixel electrode formed thereon. The gate line intersects the data line to define a plurality of pixel regions in which the pixel electrodes are formed. Each of the pixel electrodes overlaps the signal line to form a first sensing capacitor and overlaps the gate line to form a second sensing capacitor.

Claims

1. An array substrate for a liquid crystal display device, comprising a gate line, a data line, a thin film transistor (TFT), a signal line and a pixel electrode formed thereon, the gate line intersecting the data line to define a pixel region in which the pixel electrode is formed, wherein a gate, a source and a drain of the TFT are connected with the gate line, the data line and the pixel electrode respectively;

wherein the signal line is parallel with the data line, the pixel electrode overlaps with the signal line to form a first sensing capacitor and overlaps with one gate line to form a second sensing capacitor;

wherein the change of the pixel electrode voltage is reflected on the first sensing capacitor formed on the signal line to cause a change of voltage on the signal line, the change of voltage on the signal line is superimposed on a pulse signal transmitted on the signal line to obtain a voltage signal on the signal line;

wherein the same change of the pixel electrode voltage is also reflected on the second sensing capacitor formed on the gate line to cause another change of voltage on the gate line, the another change of voltage on the gate line is superimposed on the scan signal transmitted on the gate line to obtain a voltage signal on the gate line; and

wherein the voltage signal on the signal line and the voltage signal on the gate line are used to determine a touch position related to the touch operation.

2. The array substrate of claim 1, wherein the data line is disposed at one side of the pixel region, and the signal line is disposed at another side of the pixel region opposite to the data line.

3. The array substrate of claim 1, wherein the signal line and the data line are formed of a same material in a same layer.

4. The array substrate of claim 1, wherein the data line is disposed at one side of the pixel region, and the signal line is disposed at another side of the pixel region opposite to the data line.

5. The array substrate of claim 1, wherein the signal line and the data line are formed of a same material in a same layer.

6. The array substrate of claim 1, wherein the signal line is connected with a narrow timing pulse generator.

7. A method for manufacturing an array substrate, comprising:

forming a gate line and a data line on a base substrate, the gate line intersecting the data line to define a pixel region;

forming a signal line parallel with the data line; and

forming a pixel electrode in the pixel region,

wherein the pixel electrode overlaps with one signal line to form a first sensing capacitor and overlaps with one gate line to form a second sensing capacitor;

wherein in response to a touch operation, a change of a pixel electrode voltage is produced;

wherein the change of the pixel electrode voltage is reflected on the first sensing capacitor formed on the signal line to cause a change of voltage on the signal line, the change of voltage on the signal line is superimposed on a pulse signal transmitted on the signal line to obtain a voltage signal on the signal line; and

wherein the same change of the pixel electrode voltage is also reflected on the second sensing capacitor formed on the gate line to cause another change of voltage on the gate line, the another change of voltage on the gate line is superimposed on the scan signal transmitted on the gate line to obtain a voltage signal on the gate line; and

wherein the voltage signal on the signal line and the voltage signal on the gate line are used to determine a touch position related to the touch operation.