In-Cell Touch Liquid Crystal Display Module and Manufacturing Method For The Same

• US 20150085210A1
• Filed: 12/01/2014
• Published: 03/26/2015
• Est. Priority Date: 05/22/2009
• Status: Abandoned Application

• Current Assignee: AU Optronics Corporation
• Original Assignee: AU Optronics Corporation
• Inventors: Kuo, Min-chien
• Application Number:
  US14/557,089
• Publication Number:
  US 20150085210A1
• Time in Patent Office: Days
• US Class Current: 349/12
• CPC Class Codes: G02F 1/133302 Rigid substrates, e.g. inorganic substrates
• CPC Class Codes: G02F 1/133305 Flexible substrates, e.g. plastics, organic film
• CPC Class Codes: G02F 1/13338 Input devices, e.g. touch panels
• CPC Class Codes: G02F 1/133514 Colour filters
• CPC Class Codes: G02F 1/13452 Conductors connecting driver circuitry and terminals of panels
• CPC Class Codes: G06F 3/0412 Digitisers structurally integrated in a display
• CPC Class Codes: H05K 1/189 characterised by the use of a flexible or folded printed circuit H05K3/326 takes precedence
• CPC Class Codes: H05K 2201/10136 Liquid Crystal display [LCD]
• CPC Class Codes: H05K 3/0058 Laminating printed circuit boards onto other substrates, e.g. metallic substrates H05K1/0281 takes precedence
• CPC Class Codes: H05K 3/10 in which conductive material is applied to the insulating support in such a manner as to form the desired conductive pattern
• CPC Class Codes: Y10T 156/10 Methods of surface bonding and/or assembly therefor

Abstract

An in-cell touch liquid crystal display module includes a first glass substrate, a metal film disposed on the first glass substrate, a liquid crystal layer disposed on the metal film, a second glass substrate disposed on the liquid crystal layer, a conductive layer disposed on the second glass substrate for generating a sensing signal in response to a touch of the conductive layer, a flexible circuit board comprising a plurality of wires coupling the conductive layer, for transmitting the sensing signal, a conductive adhesive for adhering and fastening the flexible circuit board on the second glass substrate, and an insulating adhesive disposed on an periphery of the first glass substrate, for adhering the flexible circuit board on the first glass substrate.

Claims

1. An in-cell touch liquid crystal display module, comprising:

a first glass substrate;

a metal film disposed on the first glass substrate;

a liquid crystal layer disposed on the metal film;

a second glass substrate disposed on the liquid crystal layer;

a conductive layer disposed on the second glass substrate, for generating a sensing signal in response to a touch of the conductive layer;

a flexible circuit board, comprising a plurality of wires coupling to the conductive layer, for electrically conducting the sensing signal; and

an electrically insulating adhesive structure, disposed on a periphery of the first glass substrate where the second glass substrate does not overlap, for adhering the flexible circuit board on the first glass substrate and electrically insulating said flexible circuit board from said metal film.

2. The in-cell touch liquid crystal display module of claim 1, wherein said first adhesion point comprises a conductive adhesive for adhering and fastening the flexible circuit board on a periphery of the second glass substrate.

3. The in-cell touch liquid crystal display module of claim 2, wherein the conductive adhesive is an anisotropic conductive film.

4. The in-cell touch liquid crystal display module of claim 1 further comprising a color filter disposed between the liquid crystal layer and the second glass substrate, for filtering out light beam penetrating through the liquid crystal layer.

5. The in-cell touch liquid crystal display module of claim 4 wherein a sum of a thickness of the metal film, the liquid crystal layer, the color filter, the second glass substrate, the conductive layer, and the conductive adhesive is similar to that of the insulating adhesive structure.

6. The in-cell touch liquid crystal display module of claim 1, wherein the insulating adhesive structure is a double-sided tape comprising a first adhesion layer, a second adhesion layer, and a base layer between the first adhesion layer and the second adhesion layer.

7. The in-cell touch liquid crystal display module of claim 1, wherein said electrically insulating adhesive structure partially overlaps said metal film.

8. The in-cell touch liquid crystal display module of claim 1, wherein said flexible circuit board further comprises a first side that comprises said plurality of wires, and said electrically insulating adhesive structure adheres said first side to said first glass substrate.

9. A method of manufacturing an in-cell touch liquid crystal display module, comprising:

(a) providing a first glass substrate;

(b) forming a metal film on the first glass substrate;

(c) providing a second glass substrate;

(d) forming a conductive layer on a top of the second glass substrate and a color filter layer on a bottom of the second glass substrate;

(e) forming a liquid crystal layer between the first glass substrate and the second glass substrate;

(f) aligning and joining the first glass substrate and the second glass substrate;

(g) providing an insulating adhesive on a periphery of the first glass substrate where the second glass substrate does not overlap;

(h) providing a conductive adhesive on the conductive layer;

(i) adhering a first polarizer and a second polarizer on a top surface of the conductive layer and a bottom surface of the first glass substrate; and

(j) providing and pressing a flexible circuit board, so that the flexible circuit board is non-conductively adhered to the first glass substrate by the insulating adhesive and conductively adhered and fastened to the conductive layer by the conductive adhesive.

10. The method of claim 9, wherein the flexible circuit board further comprises a detecting circuit and a plurality of wires coupling between the detecting circuit and the conductive layer, the detecting circuit is used for determining a contact position of the conductive layer where an external force applied, according to a sensing signal from the conductive layer.

11. The method of claim 9, after the step (j), further comprising:

(k) testing if sensing signals are generated by the conductive layer and transmitted to the flexible circuit board; and

(l) replacing the flexible circuit board when the sensing signals are not transmitted to the flexible circuit board.

12. The method of claim 11, wherein the step (1) comprises:

(11) removing the adhered flexible circuit board from the first glass substrate and the conductive layer;

(12) clearing up the insulating adhesive and the conductive adhesive;

(13) providing another insulating adhesive on the periphery of the first glass substrate;

(14) providing another conductive adhesive on the conductive layer; and

(15) providing and pressing another new FPC, so that the new FPC is adhered and fastened to the first glass substrate and the conductive layer by employing the insulating adhesive and the conductive adhesive, respectively.

13. The method of claim 9, wherein within said step (j), said flexible circuit board comprises a first side non-conductively adhered to the first glass substrate by the insulating adhesive and conductively adhered and fastened to the conductive layer by the conductive adhesive, and said insulating adhesive electrically insulates said flexible circuit board from said metal layer.

15. The method of manufacturing an in-cell touch liquid crystal display module of claim 10, wherein step (g) is performed so that said insulating adhesive partially overlaps said metal film.

14. A touch panel liquid crystal display, comprising:

an array substrate comprising a first glass substrate and a metal layer thereon;

a color filter correspondingly disposed on the array substrate;

a liquid crystal layer disposed between the array substrate and the color filter;

an in-cell touch panel, comprising a second glass substrate and a conductive layer disposed on the color filter, and the color filter sandwiched between the liquid crystal layer and the conductive layer;

a flexible circuit board;

an insulating adhesive, disposed on a periphery of the first glass substrate of the array substrate where the second glass substrate does not overlap, for non-conductively adhering and fastening the flexible circuit board on the array substrate; and

an anisotropic conductive film disposed on a periphery of the conductive layer, for adhering and fastening the flexible circuit board on the conductive layer.

16. The touch panel liquid crystal display of claim 14, wherein the insulating adhesive is a double-sided tape comprising a first adhesion layer, a second adhesion layer, and a base layer between the first adhesion layer and the second adhesion layer.

17. The touch panel liquid crystal display of claim 16, wherein the first adhesion layer and the second adhesion layer is made of Tackified Acrylic.

18. The touch panel liquid crystal display of claim 16, wherein the base layer is made of Polyethylene Terephthalate (PET).

19. The touch panel liquid crystal display of claim 14, wherein a thickness of the insulating adhesive is in a range between 40 micrometers and 550 micrometers.

20. The touch panel liquid crystal display of claim 14, wherein said insulating adhesive partially overlaps said metal layer.