Touch panel substrate and display panel

Patent metadata

Field	Value
Publication number	US-9405330-B2
Application number	US-201214235172-A
Country	US
Kind code	B2
Filing date	Jul 4, 2012
Priority date	Jul 29, 2011
Publication date	Aug 2, 2016
Grant date	Aug 2, 2016

Abstract

A touch panel substrate ( 5 ) provided with position detecting electrodes (first electrodes ( 12 ) and second electrodes ( 13 )) includes a black matrix ( 17 ) which is made of an electrically conductive material and is electrically connected to a counter electrode ( 19 ). This provides (i) a touch panel substrate which is high in position detection performance and capable of carrying out a stable position detecting operation and which is used in an in-cell touch panel, and (ii) a display panel including such a touch panel substrate.

First claim

The invention claimed is:

1. A touch panel substrate for use as one of a pair of substrates which constitute a display panel, the touch panel substrate comprising:
position detecting electrodes that detect, based on a change in capacitance, a position of coordinates of a detection object, the position detecting electrodes include a plurality of first electrodes arranged along a first direction and a plurality of second electrodes arranged along a second direction perpendicular to the first direction and electrically insulated from the plurality of first electrodes, the plurality of first and second electrodes being on a same layer, and transparent electrodes; and
a counter electrode placed to face pixel electrodes provided on the other substrate of the pair of substrates which constitute the display panel;
a light blocking layer having a matrix pattern corresponding to pixels, the light blocking layer being made of an electrically conductive material and being electrically connected to the counter electrode;
transparent connecting wires provided on the same layer as the position detecting electrodes, the connecting wires connect one of the first and second electrodes; and
metal wires on a layer different from that of the position detecting electrodes, are in a form of a grid and the metal wires make bridge connections between the other of the first and second electrodes via a contact hole formed in an insulating layer between the metal wires and position detecting electrodes; wherein
the metal wires have disconnections between an area overlapped with the first electrodes and another area overlapped with the second electrodes, so that no electricity travels from the first electrodes to the second electrodes or vice versa.

2. The touch panel substrate as set forth in claim 1 , wherein the light blocking layer is provided on a lamination level different from a lamination level on which the counter electrode is provided, and the light blocking layer is electrically connected to the counter electrode via contact holes.

3. The touch panel substrate as set forth in claim 1 , wherein the electrical connection between the light blocking layer and the counter electrode is made at an outer peripheral edge of the display panel.

4. The touch panel substrate as set forth in claim 1 , wherein the counter electrode is provided on the light blocking layer.

5. A touch panel substrate as set forth in claim 2 further comprising a metal layer between the counter electrode and the light blocking layer, the metal layer being connected to the counter electrode.

6. The touch panel substrate as set forth in claim 1 , wherein:
each of the position detecting electrodes includes a plurality of first electrodes and a plurality of second electrodes; and
either the first electrodes or the second electrodes serve as driving electrodes, and the other electrodes serve as detecting electrodes.

7. The touch panel substrate as set forth in claim 1 , wherein the metal wires have outer peripheral parts which serve as connecting parts with the other one of the pair of substrates and which are electrically disconnected from the first electrodes and the second electrodes, and the counter electrode is electrically connected to the outer peripheral parts of the metal wires.

8. A display panel comprising:
an electro-optic element; and
a pair of substrates between which the electro-optic element is sandwiched, one of the pair of substrates being a touch panel substrate as set forth in claim 1 .

9. A touch panel substrate for use as one of a pair of substrates which constitute a display panel, the touch panel substrate comprising:
position detecting electrodes that detect, based on a change in capacitance, a position of coordinates of a detection object, the position detecting electrodes includes a plurality of first electrodes being arranged along a first direction and a plurality of second electrodes being arranged along a second direction perpendicular to the first direction and electrically insulated from the plurality of first electrodes, the first and second electrodes are located on a same layer and transparent electrodes; and
transparent connecting wires provided on the same layer as the position detecting electrodes, the connecting wires connect one of the first and second electrodes; and
metal wires on a layer different from that of the position detecting electrodes, are in a form of a grid and the metal wires make bridge connections between the other of the first and second electrodes via a contact hole formed in an insulating layer between the metal wires and position detecting electrodes; wherein
the metal wires have disconnections between an area overlapped with the first electrodes and another area overlapped with the second electrodes, so that no electricity travels from the first electrodes to the second electrodes or vice versa.

10. The touch panel substrate as set forth in claim 9 , wherein:
each of the position detecting electrodes includes a plurality of first electrodes and a plurality of second electrodes; and
either the first electrodes or the second electrodes serve as driving electrodes, and the other electrodes serve as detecting electrodes.

11. The touch panel substrate as set forth in claim 9 , wherein a plurality of contact holes are provided, respectively, for each of the plurality of first electrodes or for each of the plurality of second electrodes.

12. A display panel comprising:
an electro-optic element; and
a pair of substrates between which the electro-optic element is sandwiched, one of the pair of substrates being a touch panel substrate as set forth in claim 9 .

Assignees

• Yamagishi Shinji
• Sugita Yasuhiro
• Yashiro Yuhji
• Kida Kazutoshi
• Ogawa Hiroyuki
• Sharp Kk

Inventors

• Yamagishi Shinji
• Sugita Yasuhiro
• Yashiro Yuhji
• Kida Kazutoshi
• Ogawa Hiroyuki

Classifications

• G02F1/13338

  Input devices, e.g. touch panels · CPC title

• G06F2203/04107

  Shielding in digitiser, i.e. guard or shielding arrangements, mostly for capacitive touchscreens, e.g. driven shields, driven grounds · CPC title

• G06F3/044

  by capacitive means · CPC title

• G06F3/0418

  for error correction or compensation, e.g. based on parallax, calibration or alignment · CPC title

• G06F1/1692 Primary

  the I/O peripheral being a secondary touch screen used as control interface, e.g. virtual buttons or sliders · CPC title