ARRAY SUBSTRATE, LIQUID CRYSTAL DISPLAY COMPRISING THE SAME, AND METHOD FOR MANUFACTURING THE SAME

• US 20100060600A1
• Filed: 08/25/2009
• Published: 03/11/2010
• Est. Priority Date: 09/05/2008
• 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: RYU, Jai-il, WANG, Zheng
• Granted Patent: US 8,749,511 B2
• Time in Patent Office: Days
• US Class Current: 345/173
• 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. A liquid crystal display device having a touch screen function comprising:

an array substrate having a gate line, a data line, 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 the signal line is parallel with the data line,

wherein the pixel electrode overlaps the signal line to form a first sensing capacitor for sensing variation of a pixel electrode voltage applied on the pixel electrode and causing voltage variation on the signal line, and the pixel electrode also overlaps the gate line to form a second sensing capacitor for sensing variation of the pixel electrode voltage applied on the pixel electrode and causing voltage variation on the gate line; and

the gate line and the signal line are connected to a touch processing section that serves to detect the voltage variation on the gate line and the voltage variation on the signal line and determine the touch position based on the voltage variations.

2. The liquid crystal display device of claim 1, wherein the touch processing section comprises:

a first touch detecting module to determine whether the signal line is touched;

a second touch detecting module to determine whether the gate line is touched; and

a central processing module to determine the touch position based on the touched signal line and the touched gate line,

wherein the first touch detecting module is connected with the signal line, the second touch detecting module is connected with the gate line, and the central processing module is connected with the first and second touch detecting modules.

3. The liquid crystal display device of claim 2, wherein the first touching detecting module comprises a first signal amplifier and a first comparator, the first signal amplifier is connected with the signal line to amplify the voltage signal on the signal line, the first comparator is connected with the first signal amplifier to compare the amplified voltage signal of the signal line with a reference voltage signal of the signal line so as to determine whether the signal line is touched.

4. The liquid crystal display device of claim 2, wherein the second touching detecting module comprises a second signal amplifier and a second comparator, the second signal amplifier is connected with the gate line to amplify the voltage signal on the gate line, the second comparator is connected with the second signal amplifier to compare the amplified voltage signal of the gate line with a reference voltage signal of the gate line so as to determine whether the gate line is touched.

5. The liquid crystal display device of claim 1, wherein the signal line is connected with a narrow timing pulse generator.

6. The liquid crystal display device of claim 5, wherein the touch processing section comprises:

a first touch detecting module to determine whether the signal line is touched;

a second touch detecting module to determine whether the gate line is touched; and

a central processing module to determine the touch position based on the touched signal line and the touched gate line,

wherein the first touch detecting module is connected with the signal line, the second touch detecting module is connected with the gate line, and the central processing module is connected with the first and second touch detecting modules.

7. The liquid crystal display device of claim 6, wherein the first touching detecting module comprises a first signal amplifier and a first comparator, the first signal amplifier is connected with the signal line to amplify the voltage signal on the signal line, the first comparator is connected with the first signal amplifier to compare the amplified voltage signal of the signal line with a reference voltage signal of the signal line so as to determine whether the signal line is touched.

8. The liquid crystal display device of claim 6, wherein the second touching detecting module comprises a second signal amplifier and a second comparator, the second signal amplifier is connected with one gate line to amplify the voltage signal on the gate line, the second comparator is connected with the second signal amplifier to compare the amplified voltage signal of the gate line with a reference voltage signal of the gate line so as to determine whether the gate line is touched.

9. An array substrate for a liquid crystal display device, comprising a gate line, a data line, 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 the signal line is parallel with the data line, the pixel electrode overlaps the signal line to form a first sensing capacitor and overlaps one gate line to form a second sensing capacitor.

10. The array substrate of claim 9, 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.

11. The array substrate of claim 9, wherein the signal line and the data line are formed of a same material in a same layer.

12. The array substrate of claim 9, wherein the signal line are connected with a narrow timing pulse generator.

13. The array substrate of claim 12, 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.

14. The array substrate of claim 12, wherein the signal line and the data line are formed of a same material in a same layer.

15. 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 one signal line to form a first sensing capacitor and overlaps one gate line to form a second sensing capacitor.