Display device with touch detection function and electronic unit

• US 9,019,231 B2
• Filed: 08/08/2011
• Issued: 04/28/2015
• Est. Priority Date: 09/28/2010
• Status: Active Grant

• Current Assignee: Japan Display Incorporated
• Original Assignee: Japan Display Incorporated
• Inventors: Minami, Yuichiro, Minegishi, Masahiro, Noguchi, Koji, Ishizaki, Koji, Kida, Yoshitoshi, Azumi, Kohei
• Primary Examiner(s): Okebato, Sahlu
• Application Number:
  US13/137,338
• Publication Number:
  US 20120075238A1
• Time in Patent Office: 1,359 Days
• Field of Search: 345/173, 345/174
• US Class Current: 345/174
• 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 3/047 using sets of wires, e.g. crossed wires
• CPC Class Codes: G09G 2300/0426 Layout of electrodes and connections
• CPC Class Codes: G09G 3/3611 Control of matrices with row and column drivers

Abstract

A display device with a touch detection function includes a display function layer, a plurality of touch detection electrodes arranged side by side to extend in a first direction, and a plurality of drive electrodes arranged side by side to extend in a second direction, electrostatic capacitance being formed at intersections of the touch detection electrodes and the drive electrodes. The plurality of drive electrodes extends to a first position or a second position outside of the first position, the first position being away from a center of an outermost touch detection electrode by a half length of an arrangement pitch of the touch detection electrodes, the outermost touch detection electrode being defined as outermost one of touch detection electrodes included in an effective display region of the display function layer, and an outer edge of the effective display region is located on or inside the first position.

Claims

1. A display device with a touch detection function comprising:

a display function layer;

a plurality of touch detection electrodes arranged side by side to extend in a first direction; and

a plurality of drive electrodes arranged side by side to extend in a second direction intersecting with the first direction, electrostatic capacitance being formed at intersections of the touch detection electrodes and the drive electrodes, wherein

the plurality of drive electrodes extends to a first position or a second position outside of the first position, the first position being away from a center of an outermost touch detection electrode by a distance longer than a half length of a distance between the center of the outermost touch detection electrode and a center of a touch detection electrode adjacent thereto within an effective display region of the display function layer, the outermost touch detection electrode being defined as outermost one of touch detection electrodes included in the effective display region of the display function layer, and

an outer edge of the effective display region is located on or inside the first position.

2. The display device according to claim 1, wherein the plurality of drive electrodes include one or more drive electrodes arranged side by side outside the effective display region in the first direction as well.

3. The display device according to claim 1, wherein the plurality of touch detection electrodes include one or more touch detection electrodes arranged side by side outside the effective display region in the second direction as well, and extend to at least a third position located outside an outermost drive electrode.

4. The display device according to claim 1, wherein

the plurality of touch detection electrodes are formed to have a same electrode width, and

the distance between the center of the outermost touch detection electrode and the center of the touch detection electrode adjacent thereto is larger than that between a center of an innermost touch detection electrode and a center of a touch detection electrode adjacent thereto, within the effective display region.

5. The display device according to claim 1, wherein

the plurality of touch detection electrodes are arranged with a same arrangement pitch, and

a width of the outermost touch detection electrode is smaller than that of an innermost touch detection electrode, within the effective display region.

6. The display device according to claim 1, further comprising an upper layer formed over the plurality of touch detection electrodes to cover at least the effective display region, wherein a thickness of the upper layer in an outer region in the second direction is smaller than that in a center of the effective display region in the second direction.

7. The display device according to claim 1, wherein the display function layer includes a liquid crystal display layer, a pixel electrode, and a common electrode.

8. The display device according to claim 7, wherein the common electrode is used as the drive electrode, as well.

9. The display device according to claim 7, wherein the common electrode is arranged on an opposite side of the pixel electrodes from the liquid crystal display layer, or is arranged between the liquid crystal display layer and the pixel electrode.

10. The display device according to claim 7, wherein the common electrode is arranged on an opposite side of the liquid crystal display layer from the pixel electrode.

21. The display device according to claim 1, wherein respective ones of the plurality of drive electrodes extend out of the effective display region.

22. The display device according to claim 1, wherein respective ones of the plurality of drive electrodes are formed as a stripe shape.

23. The display device according to claim 1, wherein a first layer in which respective ones of the plurality of drive electrodes are formed and a second layer in which respective ones of the plurality of touch detection electrodes are formed are distinct layers.

11. A display device comprising:

a display function layer;

a plurality of touch detection electrodes; and

a plurality of drive electrodes forming electrostatic capacitance at intersections of the touch detection electrodes and the drive electrodes, wherein

the plurality of drive electrodes extend to a first position or an outside of the first position, the first position being away from a center of an outermost touch detection electrode by a distance longer than a half length of a distance between the center of the outermost touch detection electrode and a center of a touch detection electrode adjacent thereto within an effective display region of the display function layer, the outermost touch detection electrode being defined as outermost one of touch detection electrodes included in the effective display region of the display function layer.

12. The display device according to claim 11, wherein an outer edge of the effective display region is located on or inside the first position.

13. The display device according to claim 11, wherein the plurality of drive electrodes include one or more drive electrodes arranged side by side outside the effective display region as well.

14. The display device according to claim 11, wherein the plurality of touch detection electrodes include one or more touch detection electrodes arranged side by side outside the effective display region as well.

15. The display device according to claim 11, wherein the distance between the center of the outermost touch detection electrode and the center of the touch detection electrode adjacent thereto is larger than that between a center of an innermost touch detection electrode and a center of a touch detection electrode adjacent thereto.

16. The display device according to claim 11, wherein a width of the outermost touch detection electrode is smaller than that of an innermost touch detection electrode.

17. The display device according to claim 11, further comprising an upper layer formed over the plurality of touch detection electrodes to cover at least the effective display region, wherein a thickness of the upper layer in an outer region is equal to or smaller than that in an inner region.

18. An electronic unit including;

a display device with a touch detection function, and

a control section performing operation control with use of the display device with a touch detection function,

the display device comprising;

a display function layer;

a plurality of touch detection electrodes arranged side by side to extend in a first direction; and

a plurality of drive electrodes arranged side by side to extend in a second direction intersecting with the first direction, electrostatic capacitance being formed at intersections of the touch detection electrodes and the drive electrodes, wherein

the plurality of drive electrodes extend to a first position or a second position outside of the first position, the first position being away from a center of an outermost touch detection electrode by a distance longer than a half length of a distance between the center of the outermost touch detection electrode and a center of a touch detection electrode adjacent thereto within an effective display region of the display function layer, the outermost touch detection electrode being defined as outermost one of touch detection electrodes included in the effective display region of the display function layer, and

an outer edge of the effective display region is located on or inside the first position.

19. The electronic unit according to claim 18, wherein

the plurality of touch detection electrodes are formed to have a same electrode width, and

the distance between the center of the outermost touch detection electrode and the center of the touch detection electrode adjacent thereto is larger than that between a center of an innermost touch detection electrode and a center of a touch detection electrode adjacent thereto, within the effective display region.

20. The electronic unit according to claim 18, wherein

the plurality of touch detection electrodes are arranged with a same arrangement pitch, and

a width of the outermost touch detection electrode is smaller than that of an innermost touch detection electrode, within the effective display region.