Display device

• US 10,444,928 B2
• Filed: 11/06/2017
• Issued: 10/15/2019
• Est. Priority Date: 07/10/2013
• Status: Active Grant

• Current Assignee: Japan Display Incorporated
• Original Assignee: Japan Display Incorporated
• Inventors: Tanaka, Hiroshi, Teramoto, Masahiro
• Primary Examiner(s): Marinelli, Patrick F
• Application Number:
  US15/803,936
• Publication Number:
  US 20180059827A1
• Time in Patent Office: 708 Days
• 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 3/0443 using a single layer of sensing electrodes
• 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

Abstract

In a capacitive touch panel, edge regions of the panel display generally have poor accuracy of coordinate detection of a touch point as compared to the intermediate region of the panel display. A display device includes a plurality of first electrodes arranged at predetermined pitches and extending in a X-direction; and a plurality of second electrodes arranged at predetermined pitches and extending in a Y-direction, wherein both endmost first electrodes of the plurality of first electrodes have a smaller pitch than the other first electrodes, both endmost second electrodes of the plurality of second electrodes have a smaller pitch than the other second electrodes, and the display device is configured to detect a touch based on a capacitance variation at one or more of intersections of the plurality of first electrodes with the plurality of second electrodes.

Claims

1. A touch panel comprising:

a plurality of first electrodes arranged at predetermined pitches and extending in a first direction; and

a plurality of second electrodes arranged at predetermined pitches and extending in a second direction,

wherein the plurality of first electrodes and the plurality of second electrodes are arranged so that the first electrodes are overlapped with the second electrodes in plan view and spaced from the second electrodes in cross-sectional view,

both endmost first electrodes of the plurality of first electrodes have a smaller pitch than the other first electrodes,

both endmost second electrodes of the plurality of second electrodes have a smaller pitch than the other second electrodes and a width that is the same as the other second electrodes,

an endmost second electrode is offset from the middle of the smaller pitch of the endmost second electrode towards an end of a first electrode in the first direction,

a detected touch is based on a capacitance variation at one or more intersections of the plurality of first electrodes with the plurality of second electrodes,

each pitch of the plurality of second electrodes is a distance between two vertical imaginary lines,

each second electrode of the plurality of second electrodes other than the endmost second electrodes is in the middle of the distance between the two imaginary lines for every pitch of the plurality of second electrodes other than the endmost second electrodes,

the endmost second electrodes are offset from the middle of the distance between the two imaginary lines towards the ends of intersecting first electrodes in the first direction, and when the detected touch is at an edge region in the second direction, a correction value is applied to the detected touch, and the correction value is approximately equal to the pitch of a second electrode of the plurality of second electrodes other than the endmost second electrodes divided by the pitch of the endmost second electrode.

2. The touch panel according to claim 1, being configured to calculate a centroid of touch response values to obtain a touch coordinate.

3. The touch panel according to claim 1, being configured to apply a corner correction value to the detected touch.

4. The touch panel according to claim 1, being configured to make a calibration for each of the intersections of the plurality of first electrodes with the plurality of second electrodes.

5. The touch panel according to claim 1,

wherein portions of the first electrodes and the second electrodes not overlapped with each other in plan view have a rhombic shape.