TOUCH DISPLAY PANEL

• US 20180046298A1
• Filed: 08/11/2017
• Published: 02/15/2018
• Est. Priority Date: 08/12/2016
• Status: Abandoned Application

• 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
• Application Number:
  US15/674,627
• Publication Number:
  US 20180046298A1
• Time in Patent Office: Days
• CPC Class Codes: G02F 1/13338 Input devices, e.g. touch panels
• CPC Class Codes: G02F 1/133512 Light shielding layers, e.g. black matrix G02F1/136209 takes precedence
• CPC Class Codes: G02F 1/133514 Colour filters
• CPC Class Codes: G02F 1/13394 spacers regularly patterned on the cell subtrate, e.g. walls, pillars G02F1/133377 takes precedence
• CPC Class Codes: G02F 1/13398 Spacer materials; Spacer properties
• CPC Class Codes: G02F 1/134336 Matrix
• CPC Class Codes: G02F 1/134363 for applying an electric field parallel to the substrate, i.e. in-plane switching [IPS]
• CPC Class Codes: G02F 1/134372 for fringe field switching [FFS] where the common electrode is not patterned
• 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 2203/04106 Multi-sensing digitiser, i.e. digitiser using at least two different sensing technologies simultaneously or alternatively, e.g. for detecting pen and finger, for saving power or for improving position detection
• 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 3/04166 Details of scanning methods, e.g. sampling time, grouping of sub areas or time sharing with display driving Synchronisation with the driving of the display or the backlighting unit to avoid interferences generated internally G06F3/04184
• 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
• CPC Class Codes: G06F 3/0447 Position sensing using the local deformation of sensor cells

Abstract

A touch display device includes a color filter substrate, and a thin film transistor substrate facing the color filter substrate. The thin film transistor substrate includes a common electrode layer. A force sensing electrode layer is formed on the color filter substrate. The common electrode layer includes a plurality of common electrodes. The common electrodes function as electrodes of the touch display device for sensing a touch position. The common electrodes and the force sensing electrode layer cooperatively form capacitors for sensing a touch force, their capacitance varying as a result of the distance between them being reduced.

Claims

1. A touch display device comprising:

a color filter substrate;

a thin film transistor substrate facing the color filter substrate, the thin film transistor substrate comprising a common electrode layer; and

a force sensing electrode layer formed on the color filter substrate,

wherein the common electrode layer comprises a plurality of common electrodes;

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

the plurality of common electrodes and the force sensing electrode layer cooperatively form capacitors for sensing a touch force.

2. The touch display device of claim 1, wherein the plurality of common electrodes are made of a transparent conductive material and arranged in a matrix.

3. The touch display device of claim 1, wherein a plurality of photo spacers are located between the thin film transistor substrate and the color filter substrate to keep a distance between the thin film transistor substrate and the color filter substrate;

each of the plurality of photo spacers is made of an elastic dielectric material.

4. The touch display device of claim 1, wherein the force sensing electrode layer is formed on a surface of the color filter substrate adjacent to the thin film transistor substrate.

5. The touch display device of claim 4, wherein the color filter substrate comprises a substrate, a color filter layer formed on a surface of the substrate adjacent to the thin film transistor substrate, and a planar layer formed on a surface of the color filter layer adjacent to the thin film transistor substrate;

the force sensing electrode layer is formed on a surface of the planar layer adjacent to the thin film transistor substrate.

6. The touch display device of claim 5, wherein the force sensing electrode layer is made of a transparent conductive material.

7. The touch display device of claim 5, wherein the force sensing electrode layer is made of a conductive metal or a conductive alloy;

the color filter layer comprises a plurality of color filter units spaced apart from each other and a black matrix layer in regions between any two adjacent color filter units;

the force sensing electrode layer locates below the black matrix layer and is completely covered by the black matrix layer.

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

each of the plurality of force sensing electrodes extends as a line along a same direction;

each of the plurality of force sensing electrodes is between two adjacent color filter units and has a width that is less than a width of the black matrix layer between the two adjacent color filter units.

9. The touch display device of claim 7, wherein the force sensing electrode layer have a mesh shape;

the force sensing electrode layer comprises a plurality of first portions spaced apart from each other and a plurality of second portions spaced apart from each other;

the plurality of first portions cross with the plurality of second portions;

each of the plurality of first portions extends as a line along a first direction;

each of the plurality of second portions extends as a line along a second direction, the first direction is different from the second direction;

each of the plurality of first portions is between two adjacent color filter units along the second direction and has a width that is less than a width of the black matrix layer between the two adjacent color filter units; and

each of the plurality of second portions is between two adjacent color filter units along the first direction and has a width that is less than a width of the black matrix layer between the two adjacent color filter units.

10. The touch display device of claim 5, wherein the force sensing electrode layer comprises a conductive metal layer and a transparent conductive layer stacked on the conductive metal layer, wherein the transparent conductive layer is more adjacent to the color filter substrate compared with the conductive metal layer.

11. The touch display device of claim 10, wherein the color filter layer comprises a plurality of color filter units spaced apart from each other and a black matrix layer in regions between any two adjacent color filter units;

the conductive metal layer is completely covered by the black matrix layer.

12. The touch display device of claim 1, wherein the color filter substrate comprises a substrate and a color filter layer formed on a surface of the substrate adjacent to the thin film transistor substrate;

the color filter layer comprises a plurality of color filter units spaced apart from each other;

the force sensing electrode layer function as a black matrix layer and is in regions between any two adjacent color filter units.

13. The touch display device of claim 1, wherein the force sensing electrode layer comprises a plurality of force sensing electrodes spaced apart from each other;

each of the plurality of force sensing electrodes extends as a line along a same direction.

14. The touch display device of claim 1, wherein the force sensing electrode layer have a mesh shape;

the force sensing electrode layer comprises a plurality of first portions spaced apart from each other and a plurality of second portions spaced apart from each other;

the plurality of first portions cross with the plurality of second portions;

each of the plurality of first portions extends as a line along a same first direction;

each of the plurality of second portions extends as a line along a same second direction, the first direction is different from the second direction.

15. A touch display device comprising:

a color filter substrate;

a thin film transistor substrate facing the color filter substrate; and

a first force sensing electrode layer formed on the color filter substrate,

wherein the thin film transistor substrate comprises a substrate, a common electrode layer on a side of the substrate adjacent to the color filter substrate, a second force sensing electrode layer on a side of the common electrode layer adjacent to the color filter substrate, and a pixel electrode layer on a side of the second force sensing electrode layer adjacent to the color filter substrate;

the common electrode layer, the second force sensing electrode layer, and the pixel electrode layer are electrically insulated from each other;

the second force sensing electrode layer function as a self-capacitive sensor for sensing touch position;

the second force sensing electrode layer and the first force sensing electrode layer cooperatively form capacitors for sensing a touch force.