Capacitive touch LCD panel

• US 9,323,403 B2
• Filed: 07/12/2013
• Issued: 04/26/2016
• Est. Priority Date: 06/29/2012
• Status: Active Grant

• Current Assignee: Shanghai Tianma Micro-Electronics Company Limited (Tianma Microelectronics Company Limited)
• Original Assignee: Shanghai Tianma Micro-Electronics Company Limited (Tianma Microelectronics Company Limited)
• Inventors: Ma, Jun, Wang, Lihua
• Primary Examiner(s): MA, CALVIN
• Application Number:
  US13/940,752
• Publication Number:
  US 20140002416A1
• Time in Patent Office: 1,019 Days
• Field of Search: 345/173, 345/174, 349/126, 349/167
• US Class Current: 1/1
• CPC Class Codes: G06F 3/0412 Digitisers structurally integrated in a display
• 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 capacitive touch LCD panel of IPS or FFS mode includes a first substrate, a second substrate disposed opposite the first substrate, a liquid crystal layer disposed between the first substrate and the second substrate, and a capacitive touch unit disposed on an inner surface of the first substrate that faces toward the liquid crystal layer. The liquid crystal layer is formed of negative liquid crystal molecules having a dielectric anisotropy less than negative three.

Claims

1. A capacitive touch liquid-crystal display (LCD) panel of in-plane switching (IPS) mode or fringe field switching (FFS) mode, comprising:

a first substrate;

a second substrate disposed opposite the first substrate;

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

a capacitive touch unit disposed on a surface of the first substrate, the surface of the first substrate facing toward the liquid crystal layer,

wherein the liquid crystal layer is formed of one or more negative liquid crystal molecules such that no positive liquid crystal molecules are provided between the first substrate and the second substrate, and a long axis of each negative liquid crystal molecule is arranged substantially parallel to the capacitive touch LCD panel.

2. The capacitive touch LCD panel according to claim 1, wherein the negative liquid crystal molecules have a refractive-index anisotropy value equal to or greater than 0.1.

3. The capacitive touch LCD panel according to claim 1, wherein the negative liquid crystal molecules have a dielectric anisotropy less than negative 3 (−

3).

4. The capacitive touch LCD panel according to claim 1, wherein the negative liquid crystal molecules have a viscosity coefficient less than 150 mPa·

s.

5. The capacitive touch LCD panel according to claim 1, wherein the capacitive touch unit comprises:

a first transparent electrode layer disposed on the surface of the first substrate;

an insulation layer disposed on the first transparent electrode layer; and

a second transparent electrode layer disposed on the insulating layer.

6. The capacitive touch LCD panel according to claim 5, wherein the first transparent electrode layer is an indium tin oxide layer or an indium zinc oxide layer.

7. The capacitive touch LCD panel according to claim 5, wherein the second transparent electrode layer is an indium tin oxide layer or an indium zinc oxide layer.

8. The capacitive touch LCD panel according to claim 5, wherein the first transparent electrode layer comprises:

a plurality of driving electrodes forming a driving electrode matrix having a plurality of rows and a plurality of columns, each of the driving electrodes having a rectangular shape; and

a plurality of sensing electrodes, each of the sensing electrodes having a bar shape and disposed between two adjacent columns of the driving electrodes.

9. The capacitive touch LCD panel according to claim 8, wherein the second transparent electrode layer comprises a plurality of bridging electrodes configured to electrically connect two adjacent driving electrodes disposed in a same row.

10. The capacitive touch LCD panel according to claim 5, wherein the first transparent electrode layer comprises a plurality of bar-shaped driving electrodes disposed parallel to one another along a first direction.

11. The capacitive touch LCD panel according to claim 10, wherein the second transparent electrode layer comprises:

a plurality of bar-shaped sensing electrodes disposed parallel to one another along a second direction, the second direction being orthogonal to the first direction.

12. The capacitive touch LCD panel according to claim 5, further comprising a protective layer configured to cover a surface of the second transparent electrode layer.

13. The capacitive touch LCD panel according to claim 12, further comprising a color filter film disposed on a surface of the protective layer.

14. The capacitive touch LCD panel according to claim 1, further comprising a pixel unit array disposed on a surface of the second substrate.

15. A capacitive touch panel comprising:

a first substrate having a first surface;

a second substrate having a second surface, the first surface and the second surface facing toward one another;

a liquid crystal layer disposed between the first and second substrates and formed of one or more negative liquid crystal molecules; and

a capacitive touch unit disposed on the first surface of the first substrate;

wherein no positive liquid crystal molecules are provided between the first substrate and the second substrate, and a long axis of each negative liquid crystal molecule is arranged substantially parallel to the capacitive touch panel.

16. The capacitive touch panel according to claim 15, further comprising a color filter film disposed between the liquid crystal layer and the capacitive touch unit.

17. The capacitive touch panel according to claim 15, wherein the capacitive touch unit comprises:

a first transparent electrode layer disposed on the first surface of the first substrate;

an insulation layer disposed on the first transparent electrode layer; and

a second transparent electrode layer disposed on the insulating layer.

18. The capacitive touch panel according to claim 17, wherein the first transparent electrode layer comprises:

a plurality of driving electrodes arranged in an array of rows and columns; and

a plurality of bar-shaped sensing electrodes, each of the sensing electrodes disposed between two adjacent columns of the driving electrodes.

19. The capacitive touch panel according to claim 18, wherein the second transparent electrode layer comprises a plurality of bridging electrodes configured to electrically connect two adjacent driving electrodes disposed in a same row.

20. The capacitive touch panel according to claim 17, wherein the first transparent electrode layer comprises a plurality of bar-shaped driving electrodes disposed parallel to one another along a first direction, and the second transparent electrode layer comprises a plurality of bar-shaped sensing electrodes disposed parallel to one another along a second direction, the driving electrodes being orthogonal to the sensing electrodes.