TOUCH PANEL, DISPLAY PANEL, AND DISPLAY UNIT

• US 20150235607A1
• Filed: 04/29/2015
• Published: 08/20/2015
• Est. Priority Date: 06/05/2009
• Status: Active Grant

• Current Assignee: Japan Display Incorporated
• Original Assignee: Japan Display Incorporated
• Inventors: Nakanishi, Takayuki, Noguchi, Koji, Ishizaki, Koji, Teranishi, Yasuyuki, Takeuchi, Takeya
• Granted Patent: US 10,147,382 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: G02F 1/134363 for applying an electric field parallel to the substrate, i.e. in-plane switching [IPS]
• CPC Class Codes: G02F 1/134372 for fringe field switching [FFS] where the common electrode is not patterned
• CPC Class Codes: G06F 3/03547 Touch pads, in which fingers can move on a surface
• CPC Class Codes: G06F 3/0412 Digitisers structurally integrated in a display
• CPC Class Codes: G06F 3/0418 for error correction or compensation, e.g. based on parallax, calibration or alignment
• 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: G06F 3/0448 Details of the electrode shape, e.g. for enhancing the detection of touches, for generating specific electric field shapes, for enhancing display quality
• CPC Class Codes: G06F 3/047 using sets of wires, e.g. crossed wires
• CPC Class Codes: G09G 2330/06 Handling electromagnetic interferences [EMI], covering emitted as well as received electromagnetic radiation
• CPC Class Codes: G09G 3/2983 using non-standard pixel electrode arrangements
• CPC Class Codes: G09G 3/2986 with more than 3 electrodes involved in the operation
• CPC Class Codes: G09G 3/3696 Generation of voltages supplied to electrode drivers
• CPC Class Codes: H01J 11/12 with main electrodes provided on both sides of the discharge space

Abstract

A touch panel, a display panel, and a display unit achieving prevention of erroneous detection caused by external noise, are provided. The touch panel includes: a plurality of detection scan electrodes extending in a first direction; and a plurality of detection electrodes facing the plurality of detection scan electrodes and extending in a second direction which intersects the first direction. A ratio of fringe capacitance to total capacitance between one or more selected detection scan electrodes and a first detection electrode is different from a ratio of fringe capacitance to total capacitance between the one or more selected detection scan electrodes and a second detection electrode. The one or more selected detection scan electrodes are selected, in a desired unit, from the plurality of detection scan electrodes, to be supplied with a selection pulse, and each of the first and the second detection electrodes is selected from the plurality of detection electrodes.

Claims

1. A touch panel comprising:

a scan-side substrate;

a detection-side substrate;

scan electrodes on the scan-side substrate and extending in parallel along a first direction, each scan electrode being an electrode to which a selection drive voltage is applied; and

detection electrodes facing the scan electrodes and extending in parallel along a second direction which intersects the first direction, each detection electrode being an electrode from which a detection output signal is obtained, the detection electrodes being disposed on the detection-side substrate,

wherein,

one or more selected scan electrodes are selected, in a desired unit, from the scan electrodes by the application of the selection drive voltage, and

shapes the scan electrodes or shapes of the detection electrode vary according to their positions.

2. The touch panel according to claim 1, wherein the each of detection electrodes has:

a detection electrode extending part extending along the second direction and

detection electrode projecting parts extending along the first direction.

3. The touch panel according to claim 1, wherein each of the scan electrodes has:

a scan electrode extending part extending along the first direction and

scan electrode projecting parts extending along the second direction.

4. The touch panel according to claim 2, wherein line widths of the detection electrodes in regions facing to overlap the scan electrodes are different in the scan electrode projecting parts and in the scan electrode extending parts.

5. The touch panel according to claim 3, wherein line widths of the scan electrodes in regions facing to overlap the detection electrodes are different in the scan electrode projecting parts and in the scan electrode extending parts.

6. The touch panel according to claim 3, wherein line widths of the scan electrodes in adjacent regions facing to overlap the detection electrodes are different in the scan electrode projecting parts and in the scan electrode extending parts.

7. The touch panel according to claim 4, wherein a first ratio of fringe capacitance that is between the one or more selected scan electrodes and the detection electrode projecting parts of the detection electrode, to a total capacitance, is different from a second ratio of fringe capacitance that is between the one or more selected scan electrodes and the detection electrode extending parts of the detection electrode, to the total capacitance.

8. The touch panel according to claim 5, wherein a first ratio of fringe capacitance that is between the detection electrodes and the scan electrode projecting parts of the one or more selected scan electrodes, to a total capacitance, is different from a second ratio of fringe capacitance that is between the detection electrodes and the scan electrode extending parts of the one or more selected scan electrodes, to the total capacitance.

9. The touch panel according to claim 6, a first ratio of fringe capacitance that is between the detection electrodes and the adjacent regions of the scan electrode projecting parts of the one or more selected scan electrodes, to a total capacitance, is different from a second ratio of fringe capacitance that is between the detection electrodes and the scan electrode extending parts of the one or more selected scan electrodes, to the total capacitance.

10. A display panel comprising:

a scan-side substrate;

a detection-side substrate;

pixel electrodes;

a display function layer having a display function;

common electrodes on the scan-side substrate and extending in parallel along a first direction, each common electrode being an electrode to which a selection drive voltage is applied; and

detection electrodes facing the common electrodes and extending in parallel along a second direction which intersects the first direction, each detection electrode being an electrode from which a detection output signal is obtained, the detection electrodes being disposed on the detection-side substrate,

wherein,

one or more selected common electrodes is selectable, in a desired unit, from the common electrodes by the application of the selection drive voltage, and

shapes of the common electrodes or shapes of the detection electrodes vary according to their position.