LIQUID CRYSTAL DISPLAY PANEL

• US 20170153512A1
• Filed: 10/28/2016
• Published: 06/01/2017
• Est. Priority Date: 11/26/2015
• Status: Active Grant

• Current Assignee: Hon Hai Precision Industry Co., Ltd.
• Original Assignee: Hon Hai Precision Industry Co., Ltd.
• Inventors: CHANG, WEI-CHIH, LAI, CHUNG-WEN, LEE, KUO-SHENG
• Granted Patent: US 10,067,390 B2
• Time in Patent Office: Days
• CPC Class Codes: G02F 1/133345 Insulating layers G02F1/1335, G02F1/1337, G02F1/135, G02F1/136 take precedence
• 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 1/134309 characterised by their geometrical arrangement
• CPC Class Codes: G02F 1/13439 characterised by their electrical, optical, physical properties; materials therefor; method of making
• CPC Class Codes: G02F 1/136286 Wiring, e.g. gate line, drain line
• CPC Class Codes: G02F 1/1368 in which the switching element is a three-electrode device G02F1/136277 takes precedence
• CPC Class Codes: G02F 2201/50 Protective arrangements
• CPC Class Codes: G06F 3/0412 Digitisers structurally integrated in a display
• 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

Abstract

An LCD panel includes a first substrate, a second substrate, a liquid crystal layer between the first substrate and the second substrate, and a plurality of spacers extending from the first substrate to the second substrate. Each spacer is positioned in the liquid crystal layer and has a height less than a thickness of the liquid crystal layer. No electrode for sensing touches is formed on the first substrate. The second substrate has a plurality of first touch sensor electrodes and a plurality of second touch sensor electrodes corresponding to the plurality of spacers. The first touch sensor electrodes and the second touch sensor electrodes cooperatively form a capacitive touch sensing structure. The spacers move towards the second substrate when the LCD panel is being touched.

Claims

1. A LCD panel comprising:

a first substrate being a color filter substrate;

a second substrate facing the first substrate;

a liquid crystal layer between the first substrate and the second substrate; and

a plurality of spacers extending from the first substrate to the second substrate, each one of the plurality of spacers positioned in the liquid crystal layer and having a height less than a thickness of the liquid crystal layer;

wherein no electrode for sensing touch is formed on the first substrate;

the second substrate comprises a plurality of first touch sensor electrodes corresponding to the spacers and a plurality of second touch sensor electrodes corresponding to the spacers;

the plurality of first touch sensor electrodes are spaced apart from and insulated from the plurality of second touch sensor electrodes;

the plurality of the first touch sensor electrodes and the plurality of second touch sensor electrodes cooperatively form a capacitive touch sensing structure;

the spacers are capable of moving towards the second substrate when the LCD panel is being touched, and one of the first touch sensor electrodes and one of the second touch sensor electrodes define a capacitor having a capacitance, the capacitance varies when the spacers move towards the second substrate.

2. The LCD panel of claim 1, wherein a plurality of black matrices is defined in the first substrate, each spacer corresponds to one of the black matrices.

3. The LCD panel of claim 1, wherein each spacer has a width gradually decrease along a direction from the first substrate to the second substrate.

4. The LCD panel of claim 3, wherein each spacer has a cross-sectional shape of trapezoid.

5. The LCD panel of claim 4, wherein each spacer comprises two side surfaces, one of the two side surfaces is on one side of the spacer and the other side surface is on an opposite side of the spacer;

both the two side surfaces are coupled to the first substrate;

an angle defined by each side surface and a plane of the first substrate is 30 degrees to 80 degrees.

6. The LCD panel of claim 1, wherein each spacer has a height of 10% to 70% of the thickness of the liquid crystal layer.

7. The LCD panel of claim 1, wherein the second substrate further comprises a second base layer and an insulative layer, the plurality of first touch sensor electrodes are formed on a surface of the second base layer adjacent to the liquid crystal layer;

the insulative layer is formed on the second base layer and covers the plurality of first touch sensor electrodes;

the second touch sensor electrodes are formed on a surface of the insulative layer adjacent to the liquid crystal layer.

8. The LCD panel of claim 7, wherein the second substrate further comprises a protecting layer, the protecting layer is formed on the insulative layer and covers the second touch sensor electrodes.

9. The LCD panel of claim 7, wherein each first touch sensor electrode and each second touch sensor electrode have a long strip shape;

and each first touch sensor electrode has a width, the width is greater than a width of each second touch sensor electrode.

10. The LCD panel of claim 9, wherein each second touch sensor electrode is a conductive line.

11. The LCD panel of claim 7, wherein the plurality of spacers is arranged in rows;

the spacers arranged in each row correspond to one of the first touch sensor electrodes and a plurality of second touch sensor electrodes; and

the plurality of second touch sensor electrodes corresponding to at least one row of spacers is electrically coupled.

12. The LCD panel of claim 11, wherein the plurality of second touch sensor electrodes is electrically coupled and is configured to output capacitance variations of the capacitor defined by the first touch sensor electrodes and the second touch sensor electrodes.

13. The LCD panel of claim 1, wherein the second substrate further comprises a second base layer, the first touch sensor electrodes and the second touch sensor electrodes are formed on a surface of the second base layer adjacent to the liquid crystal layer.

14. The LCD panel of claim 13, wherein the second substrate further comprises a protecting layer, the protecting layer is formed on the second base layer and covers the plurality of the first touch sensor electrodes and the plurality of second touch sensor electrodes.

15. The LCD panel of claim 13, wherein the second substrate further comprises a plurality of second TFTs;

each second TFT comprises a gate electrode electrically coupled to a touch scanning line, a drain electrode electrically coupled to a touch data line, and a source electrode electrically coupled to one of the first touch sensor electrodes;

the touch scanning line is configured to switch between a power-on mode and a power-off mode of the second TFT;

the touch data line is configured to output capacitance variations of the capacitor defined by the first touch sensor electrodes and the second touch sensor electrodes.

16. The LCD panel of claim 13, wherein each first touch sensor electrode and each second touch sensor electrode are shaped like a comb.

17. The LCD panel of claim 16, wherein each first touch sensor has a first main portion and a plurality of first extending portions extending from the first main portion;

the plurality of first extending portions faces each other and is parallel to each other;

each second touch sensor electrode has a second main portion and a plurality of second extending portions extending from the second main portion;

the plurality of second extending portions faces each other and parallel to each other; and

each first extending portion is positioned between and spaced apart from the two adjacent second extending portions.