Electromagnetic-type touch substrate and electromagnetic-type touch display apparatus

Patent metadata

Field	Value
Publication number	US-9612702-B2
Application number	US-201414479142-A
Country	US
Kind code	B2
Filing date	Sep 5, 2014
Priority date	Mar 31, 2014
Publication date	Apr 4, 2017
Grant date	Apr 4, 2017

Abstract

An electromagnetic-type touch substrate is disclosed. The electromagnetic-type touch substrate includes a substrate having a display region and a non-display region, and a first conductive layer formed on a first side of the substrate, where the first conductive layer includes a plurality of first electromagnetic induction coils forming loops extending in a first direction. The electromagnetic-type touch substrate also includes a second conductive layer formed on a second side of the substrate, where the second conductive layer includes a plurality of second electromagnetic induction coils forming loops extending in a second direction. In addition, the first direction is perpendicular to the second direction.

First claim

What is claimed is:

1. An electromagnetic-type touch substrate, comprising:
a substrate comprising a display region and a non-display region;
a first conductive layer formed on one side of the substrate, wherein the first conductive layer comprises a plurality of first electromagnetic induction coils which extend in a first direction and form loops;
a second conductive layer formed on the other side of the substrate, wherein the second conductive layer comprises a plurality of second electromagnetic induction coils which extend in a second direction and form loops, wherein the second direction is perpendicular to the first direction;
a first control circuit electrically connected to one side of the first electromagnetic induction coils, and a second control circuit electrically connected to one side of the second electromagnetic induction coils,
wherein the first control circuit comprises a plurality of first transistors, a first control wire for controlling states of the first transistors, a first signal wire and a plurality of first detecting units, and gate electrodes of the first transistors are electrically connected to the first control wire,
wherein the source electrodes of the first transistors are electrically connected to the first signal wire, and the drain electrodes of the first transistors are electrically connected to one side of the first electromagnetic induction coils and to the first detecting units; or, the drain electrodes of the first transistors are electrically connected to the first signal wire, and the source electrodes of the first transistors are electrically connected to one side of the first electromagnetic induction coils and to the first detecting units;
wherein the second control circuit comprises a plurality of second transistors, a second control wire for controlling states of the second transistors, a second signal wire and a plurality of second detecting units, and gate electrodes of the second transistors are electrically connected to the second control wire;
wherein the source electrodes of the second transistors are electrically connected to the second signal wire, the drain electrodes of the second transistors are electrically connected to one side of the second electromagnetic induction coils and to the second detecting units; or, the drain electrodes of the second transistors are electrically connected to the second signal wire, and the source electrodes of the second transistors are electrically connected to one side of the second electromagnetic induction coils and to the second detecting units;
wherein in the case that a touch is detected, the first control wire controls all the first transistors to turn off, the first electromagnetic induction coils are independent from each other, electromagnetic induction currents are generated in the first electromagnetic induction coils which are electromagnetic induced, the electromagnetic induction currents are detected by the first detecting unit, and a coordinate of a touch position in the second direction is determined and its output is provide; the second control wires controls all the second transistors to turn off, the second electromagnetic induction coils are independent from each other, electromagnetic induction currents are generated in the second electromagnetic induction coils which are electromagnetic induced, the electromagnetic induction currents are detected by the second detecting unit, and a coordinate of the touch position in the first direction is determined and its output is provided.

2. The electromagnetic-type touch substrate according to claim 1 , wherein the first conductive layer is a transparent shielding electrode layer.

3. The electromagnetic-type touch substrate according to claim 1 , wherein the second conductive layer is a black matrix layer.

4. The electromagnetic-type touch substrate according to claim 3 , wherein the black matrix layer is made of a conductive light-shading material of titanium sub-oxide or chromium.

5. The electromagnetic-type touch substrate according to claim 1 , wherein each first electromagnetic induction coil or each second electromagnetic induction coil comprises at least two sensing electrodes arranged in parallel in the display region and a connecting wire arranged in the non-display region for connecting the sensing electrodes.

6. The electromagnetic-type touch substrate according to claim 5 , wherein the first electromagnetic induction coil or the second electromagnetic induction coil comprises three sensing electrodes arranged in parallel, wherein ends of the three sensing electrodes on one side are connected to each other by the connecting wire.

7. The electromagnetic-type touch substrate according to claim 5 , wherein the first electromagnetic induction coil or the second electromagnetic induction coil comprises a first sensing electrode, a second sensing electrode and a third sensing electrode arranged in parallel, the connecting wire comprises a first connecting wire segment and a second connecting wire segment arranged in the non-display region, ends of the first sensing electrode and the second sensing electrode on one side are connected to each other by the first connecting wire segment, and ends of the second sensing electrode and the third sensing electrode on the other side are connected to each other by the second connecting wire segment.

8. The electromagnetic-type touch substrate according to claim 5 , wherein each sensing electrode is strip-shaped.

9. The electromagnetic-type touch substrate according to claim 1 , further comprising a first grounding unit electrically connected to the other side of the first electromagnetic induction coils and a second grounding unit electrically connected to the other side of the second electromagnetic induction coils,
wherein in case of detecting the touch, the electromagnetic induction currents are generated both in the first electromagnetic induction coils and in the second electromagnetic induction coils.

10. The electromagnetic-type touch substrate according to claim 9 , wherein the first grounding unit comprises a plurality of third transistor switches and a third control wire for controlling states of the third transistor switches, and gate electrodes of the third transistor switches are electrically connected to the third control wire;
wherein source electrodes of the third transistor switches are electrically connected to the other side of the first electromagnetic induction coils, and drain electrodes of the third transistor switches are grounded; or
the drain electrodes of the third transistor switches are electrically connected to the other side of the first electromagnetic induction coils, and the source electrodes of the third transistor switches are grounded;
wherein the second grounding unit comprises a plurality of fourth transistor switches and a fourth control wire for controlling states of the fourth transistor switches, and gate electrodes of the fourth transistor switches are electrically connected to the fourth control wire;
wherein source electrodes of the fourth transistor switches are electrically connected to the other side of the second electromagnetic induction coils, and drain electrodes of the fourth transistor switches are grounded; or
the drain electrodes of the fourth transistor switches are electrically connected to the other side of the second electromagnetic induction coils, and the source electrodes of the fourth transistor switches are grounded; and
wherein in case of detecting the touch, the third control wire controls all the third transistor switches to turn on, electromagnetic induction currents are generated in the first electromagnetic induction coils which are electromagnetic

Assignees

• Shanghai Tianma Microelectronics Co Ltd
• Tianma Microelectronics Co Ltd

Inventors

• Jiang Wenxin
• Huo Sitao

Classifications

• G06F3/046 Primary

  by electromagnetic means · CPC title

• G06F3/044

  by capacitive means · CPC title

• G06F3/04164

  Connections between sensors and controllers, e.g. routing lines between electrodes and connection pads · 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

• G06F3/0412

  Digitisers structurally integrated in a display · CPC title