Touch display panel

• US 10,296,152 B2
• Filed: 08/11/2017
• Issued: 05/21/2019
• Est. Priority Date: 08/12/2016
• Status: Active Grant

• Current Assignee: Hon Hai Precision Industry Co., Ltd.
• Original Assignee: Hon Hai Precision Industry Co., Ltd.
• Inventors: Weng, Yu-Fu, Lin, Chien-Wen, Liu, Chia-Lin
• Primary Examiner(s): Dharia, Prabodh M
• Application Number:
  US15/674,635
• Publication Number:
  US 20180046279A1
• Time in Patent Office: 648 Days
• Field of Search: 345156-184
• CPC Class Codes: G02F 1/13338 Input devices, e.g. touch panels
• CPC Class Codes: G02F 1/133514 Colour filters
• CPC Class Codes: G02F 1/133528 Polarisers
• CPC Class Codes: G02F 1/134336 Matrix
• CPC Class Codes: G02F 1/13439 characterised by their electrical, optical, physical properties; materials therefor; method of making
• CPC Class Codes: G02F 1/1368 in which the switching element is a three-electrode device G02F1/136277 takes precedence
• CPC Class Codes: G06F 2203/04105 Pressure sensors for measuring the pressure or force exerted on the touch surface without providing the touch position
• CPC Class Codes: G06F 2203/04112 Electrode mesh in capacitive digitiser: electrode for touch sensing is formed of a mesh of very fine, normally metallic, interconnected lines that are almost invisible to see. This provides a quite large but transparent electrode surface, without need for ITO or similar transparent conductive material
• CPC Class Codes: G06F 3/0412 Digitisers structurally integrated in a display
• CPC Class Codes: G06F 3/041661 using detection at multiple resolutions, e.g. coarse and fine scanning; using detection within a limited area, e.g. object tracking window
• CPC Class Codes: G06F 3/041662 using alternate mutual and self-capacitive scanning
• 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

A touch display device includes a display module and a sensing module on the display module. The sensing module includes a first electrode layer on the display module, a second electrode layer facing the first electrode layer, and a dielectric layer between the first electrode layer and the second electrode layer. The second electrode layer includes a plurality of electrodes. The electrodes functions as electrodes of the touch display device for sensing a touch position. The electrodes, the first electrode layer, and the dielectric layer cooperatively form capacitors for sensing a touch force.

Claims

1. A touch display device comprising:

a display module;

a sensing module on the display module, the sensing module comprising;

a first electrode layer on the display module;

a second electrode layer facing the first electrode layer; and

a dielectric layer between the first electrode layer and the second electrode layer;

wherein the second electrode layer comprises a plurality of electrodes;

the plurality of electrodes functions as electrodes of the touch display device for sensing a touch position;

the plurality of electrodes, the first electrode layer, and the dielectric layer cooperatively form capacitors for sensing a touch force;

wherein the plurality of electrodes are spaced apart from each other and arranged in a matrix of rows and columns;

each row of the electrodes is arranged along an X axis direction; and

each column of the electrodes is arranged along a Y axis direction;

wherein each of the plurality of electrodes is electrically coupled to a trace;

the trace is connected to a corner of one of the plurality of electrodes;

the electrodes in each column of the electrodes have area sizes gradually decrease along the Y axis direction;

the traces of the plurality of electrodes are parallel to each other.

2. The touch display device of claim 1, wherein the traces of each column of the electrodes are at a same side of the column of the electrodes.

3. The touch display device of claim 1, wherein two traces of every two adjacent electrodes in each column of the electrodes are at opposite sides of the column of the electrodes.

4. The touch display device of claim 1, wherein the dielectric layer is deformable and transparent.

5. The touch display device of claim 1, wherein each of the plurality of electrodes is made of a transparent conductive material.

6. The touch display device of claim 1, wherein the first electrode layer is a metal mesh.

7. The touch display device of claim 1, wherein the first electrode layer is made of a transparent conductive material.

8. The touch display device of claim 7, wherein the first electrode layer includes a plurality of first electrodes spaced apart from each other;

each of the plurality of first electrodes extends as a strip along a same direction.

9. The touch display device of claim 1, wherein the display module is a liquid crystal module;

the display module comprises a thin film transistor (TFT) substrate, a color filter substrate facing the TFT substrate, and a liquid crystal layer between the TFT substrate and the color filter substrate;

the first electrode layer is formed on the color filter substrate.

10. The touch display device of claim 1, wherein the touch display panel further comprises a first polarizer and a second polarizer;

the first polarizer is on a side of the sensing module away from the display module, and the second polarizer is on a side of the display module away from the sensing module.