Liquid crystal display screen

• US 8,411,051 B2
• Filed: 08/13/2009
• Issued: 04/02/2013
• Est. Priority Date: 07/09/2008
• Status: Active Grant

• Current Assignee: Hon Hai Precision Industry Co., Ltd., Tsinghua University
• Original Assignee: Hon Hai Precision Industry Co., Ltd., Tsinghua University
• Inventors: Jiang, Kai-Li, Liu, Liang, Fan, Shou-Shan, Chen, Ga-Lane, Cheng, Jia-Shyong, Wu, Jeah-Sheng
• Primary Examiner(s): Shalwala, Bipin
• Assistant Examiner(s): CHOWDHURY, AFROZA Y
• Application Number:
  US12/583,154
• Publication Number:
  US 20100007624A1
• Time in Patent Office: 1,328 Days
• Field of Search: 345173-175, 345/87, 977/842, 977/952
• US Class Current: 345/173
• CPC Class Codes: G06F 2203/04104 Multi-touch detection in digitiser, i.e. details about the simultaneous detection of a plurality of touching locations, e.g. multiple fingers or pen and finger
• CPC Class Codes: G06F 3/0412 Digitisers structurally integrated in a display
• CPC Class Codes: G06F 3/045 using resistive elements, e.g. a single continuous surface or two parallel surfaces put in contact

Abstract

A liquid crystal display screen includes an upper board, a lower board opposite to the upper board, and a liquid crystal layer located between the upper board and the lower board. The upper board includes a touch panel. The touch panel includes a plurality of transparent electrodes. At least one of the transparent electrodes includes a carbon nanotube structure.

Claims

1. A liquid crystal display screen, comprising:

an upper board comprising a resistance-type touch panel;

the resistance-type touch panel comprising;

a first electrode plate comprising;

a first substrate,

a plurality of first transparent electrodes, the plurality of first transparent electrodes are located on the first substrate and aligned along a first direction, and

a plurality of first signal wires, each of the first transparent electrodes is connected to one of the first signal wires;

a second electrode plate, spaced from the first electrode plate, comprising;

a second substrate,

a plurality of second transparent electrodes, the plurality of second transparent electrodes are located on the second substrate and aligned along a second direction, both the second transparent electrodes and the first transparent electrodes comprise of a transparent carbon nanotube structure, the carbon nanotube structure comprises a plurality of carbon nanotubes aligned along a same direction, and

a plurality of second signal wires, and each of the second transparent electrodes is connected to one of the second signal wires;

wherein the first transparent electrodes are contacting the second transparent electrodes at a position where pressing occurs;

a lower board comprising a thin film transistor panel; and

a liquid crystal layer located between the upper board and the lower board.

2. The liquid crystal display screen of claim 1, wherein the carbon nanotube structure comprises one or more carbon nanotube films.

3. The liquid crystal display screen of claim 2, wherein the carbon nanotube structure has a thickness of about 0.5×

10<sup>−

3</sup> μ

m to about 100 μ

m.

4. The liquid crystal display screen of claim 2, wherein the carbon nanotube films are adjacent to each other or stacked on each other.

5. The liquid crystal display screen of claim 2, wherein the carbon nanotube film comprises a disordered carbon nanotube film.

6. The liquid crystal display screen of claim 5, wherein the carbon nanotubes of the disordered carbon nanotube film are entangled with each other.

7. The liquid crystal display screen of claim 2, wherein the carbon nanotube film comprises an ordered carbon nanotube film.

8. The liquid crystal display screen of claim 7, wherein the ordered carbon nanotube film comprises a plurality of carbon nanotubes joined end to end via van der Waals attractive force.

9. The liquid crystal display screen of claim 1, wherein the carbon nanotube structure comprises at least two carbon nanotube films stacked on each other, an angle is formed between the carbon nanotubes of two adjacent carbon nanotube films, the angle is in a range about 0 degree to about 90 degrees.

10. The liquid crystal display screen of claim 1, wherein the carbon nanotubes of the carbon nanotube structure are selected from the group consisting of single walled carbon nanotubes, double walled carbon nanotubes, and multi walled carbon nanotubes, the single walled carbon nanotubes have diameters of about 0.5×

10<sup>−

3</sup> μ

m to about 5×

10<sup>−

2</sup> μ

m, the double walled carbon nanotubes have diameters of about 1.0×

10<sup>−

3</sup> μ

m to about 5×

10<sup>−

2</sup> μ

m, the multi walled carbon nanotubes have diameters of about 1.5×

10<sup>−

3</sup> μ

m to about 5×

10<sup>−

2</sup> μ

m.

11. The liquid crystal display screen of claim 1, wherein the carbon nanotube structure is a composite layer comprising at least one carbon nanotube film and a polymer material infiltrated in the carbon nanotube film.

12. The liquid crystal display screen of claim 11, wherein the polymer comprises of a material that is selected from the group consisting of polycarbonate (PC), polymethyl methacrylate acrylic (PMMA), polyethylene terephthalate (PET), benzocyclobutenes (BCB), polystyrene, polyethylene, polycarbonate, and polycycloolefins.

13. The liquid crystal display screen of claim 1, wherein the first transparent electrodes are aligned along a first direction, the second transparent electrodes are aligned along a second direction, and the first direction is perpendicular to the second direction.

14. The liquid crystal display screen of claim 1, wherein the plurality of the first transparent electrodes and the plurality of the second transparent electrodes are uniformly arranged, the first and second transparent electrodes have strip-shaped structures and have width of about 20 μ

m to about 250 μ

m, the first and second transparent electrodes have thickness of about 0.5×

10<sup>−

3</sup> μ

m to about 100 μ

m, the first and second transparent electrodes have a distance therebetween of about 20 μ

m to about 50 μ

m.

15. The liquid crystal display screen of claim 1, wherein the plurality of the first transparent electrodes each has a first end and a second end, the first end is electrically connected to the X-coordinates driving source via the first signal wire, the second end is electrically connected to a sensor via the first signal wire;

the plurality of the second transparent electrodes each has a first end and a second end, the first end of the second transparent electrodes is electrically connected to the Y-coordinates driving source via the second signal wire, the second end of the second transparent electrodes is grounded.

16. The liquid crystal display screen of claim 1, wherein the plurality of the first signal wires are parallel to each other, the plurality of the second signal wires are parallel to each other, the first and second signal wires comprise of a material selected from a group consisting of indium tin oxide, antimony tin oxide, conductive resin, carbon nanotubes, and combinations thereof.

17. The liquid crystal display screen of claim 1, wherein the upper board further comprises a first polarizing layer and a first alignment layer, the first polarizing layer is disposed directly on a lower surface of the second substrate of the touch panel, the first alignment layer is disposed on a lower surface of the first polarizing layer.

18. The liquid crystal display screen of claim 17, wherein the first polarizing layer comprises a plurality of carbon nanotubes arranged along a preferred orientation.

19. The liquid crystal display screen of claim 17, wherein the first polarizing layer has a thickness of about 1 μ

m to about 0.5×

10³ μ

m.

20. The liquid crystal display screen of claim 1, wherein the thin film transistor panel further comprises:

a third substrate;

a display driving circuit;

a plurality of thin film transistors disposed the third substrate and electrically connected to the display driving circuit; and

a plurality of pixel electrodes, one of pixel electrodes being electrically connected to each of the thin film transistors.

21. The liquid crystal display screen of claim 1, wherein the lower board further comprises a second alignment layer and a second polarizing layer, the second polarizing layer is disposed on a lower surface of the thin film transistor panel, the second alignment layer is disposed on an upper surface of the thin film transistor panel and adjacent to the liquid crystal layer.

22. The liquid crystal display screen of claim 1, wherein the lower board further comprises a carbon nanotube layer configured for both polarizing light and aligning liquid crystals, wherein the carbon nanotube layer comprises a plurality of carbon nanotubes substantially arranged along a primary direction.

23. A liquid crystal display screen, comprising:

an upper board comprising a resistance-type touch panel, the resistance-type touch panel comprising;

a resistance-type touch panel comprising;

a first electrode plate comprising;

a first substrate,

a plurality of first transparent electrodes, the plurality of first transparent electrodes are located on the first substrate, spaced from each other and aligned along a first direction, a distance between adjacent first transparent electrodes is in a range from about 20 microns to about 50 microns, and

a plurality of first signal wires, each of the first transparent electrodes is connected to one of the first signal wires;

a second electrode plate, spaced from the first electrode plate, comprising;

a second substrate,

a plurality of second transparent electrodes, the plurality of second transparent electrodes located on the second substrate, spaced from each other and aligned along a second direction, a distance between adjacent second transparent electrodes is in a range from about 20 microns to about 50 microns, the second transparent electrodes and the first transparent electrodes comprise a transparent carbon nanotube structure, the carbon nanotube structure comprises a plurality of metallic carbon nanotubes aligned along a same direction, and

a plurality of second signal wires, and each of the second transparent electrodes is connected to one of the second signal wires;

wherein the first transparent electrodes are contacting the second transparent electrodes at a position where pressing occurs;

a lower board comprising a thin film transistor panel; and

a liquid crystal layer located between the upper board and the lower board.

24. A liquid crystal display screen, comprising:

an upper board comprising a resistance-type touch panel, the resistance-type touch panel comprising;

a first electrode plate comprising;

a first substrate,

a plurality of first transparent electrodes, the plurality of first transparent electrodes are located on the first substrate, spaced from each other and aligned along a first direction, and

a plurality of first signal wires, each of the first transparent electrodes is connected to one of the first signal wires;

a second electrode plate, spaced from the first electrode plate, comprising;

a second substrate,

a plurality of second transparent electrodes, the plurality of second transparent electrodes are located on the second substrate, spaced from each other and aligned along a second direction, both the second transparent electrodes and the first transparent electrodes comprise a transparent carbon nanotube structure, the carbon nanotube structure comprises at least one ordered carbon nanotube film comprising a plurality of carbon nanotube oriented along a substantially same direction, and

a plurality of second signal wires, and each of the second transparent electrodes is connected to one of the second signal wires;

wherein the first transparent electrodes are contacting the second transparent electrodes at a position where pressing occurs;

a lower board comprising a thin film transistor panel; and

a liquid crystal layer located between the upper board and the lower board.

25. The resistance-type touch panel as claimed in claim 24, the plurality of carbon nanotubes are joined end to end by van der Waals attractive force.