Liquid crystal display device and method for manufacturing the same

• US 20030174272A1
• Filed: 04/10/2003
• Published: 09/18/2003
• Est. Priority Date: 06/08/2001
• Status: Active Grant

• Current Assignee: Nanox, Inc.
• Original Assignee: Nanox, Inc.
• Inventors: Ohta, Akihiko, Shigeeda, Akira, Kowata, Hideki, Shirato, Yasuyuki
• Granted Patent: US 6,774,971 B2
• Time in Patent Office: Days
• US Class Current: 349/149
• CPC Class Codes: G02F 1/13452 Conductors connecting driver circuitry and terminals of panels

Abstract

With the embodiment of the present invention, a liquid crystal display can be produced at a low cost, which employs the COG technology, saves installation space, mounts LSIs, and, after the LSIs are mounted, can visibly check and inspect the mounted state thereof (that is, electrically connected states thereof) and lighting of the image displaying portion. The liquid crystal display is provided with a liquid crystal displaying portion 11 in which a surface glass substrate 9 having an electrode secured therein and a rear glass substrate 10 having a transparent electrode opposite thereto provided therein are overlapped so that both of the substrates 9 and 10 are opposed to each other, and liquid crystal is sealed in pixel areas between the substrates 9 and 10; and an FPC 7 that is provided with a circuit substrate portion 7 including a LSI 5 which is incorporated on the surface of the glass substrate 3 having a transparent conductive electrode 2 provided therein and is connected electrically to the electrodes, and electrically connects respective electrodes of the liquid crystal displaying portion 11 and circuit substrate portion 6, wherein the FPC 7 is folded over to overlap the liquid crystal displaying portion 11 and the circuit substrate portion 6.

Claims

1. A liquid crystal display comprising:

a liquid crystal displaying portion in which a first substrate having a transparent pixel electrode provided thereon and a second substrate having a transparent opposed pixel electrode provided thereon overlap each other so that both said electrodes are disposed so as to be opposed to each other, and liquid crystal is sealed in a pixel area between said first substrate and said second substrate;

a circuit substrate portion that is mounted on a surface of said hard transparent substrate having a transparent conductive electrode provided thereon; and

is provided with integrated circuit chips connected electrically to said transparent conductive electrode; and

flexible connecting means for electrically connecting the transparent pixel electrode of said liquid crystal displaying portion with the transparent conductive electrode of said circuit substrate portion.

2. The liquid crystal display as set forth in claim 1, wherein said liquid crystal displaying portion and said circuit substrate portion are folded over at the middle part of said flexible connecting means so as to overlap each other.

3. The liquid crystal display as set forth in claim 2, wherein the surface on which the integrated circuit chips of said hard transparent substrate is disposed so as to face said liquid crystal displaying portion.

4. The liquid crystal display as set forth in claim 1 or 2, wherein said flexible connecting means is any one of a flexible printed circuit (FPC), a heat seal, a flexible flat cable (FFC) and an anisotropic conductive rubber connector.

5. The liquid crystal display as set forth in any one of claims 1 through 4, wherein any one of either said first substrate, second substrate and hard transparent substrate is composed of a transparent glass plate or transparent synthetic resin plate.

6. The liquid crystal display as set forth in claim 5, wherein the thicknesses of said first substrate, second substrate and hard transparent substrate are the same.

7. The liquid crystal display as set forth in claim 6, wherein said hard transparent substrate is coated with an infrared ray shielding film at surface other than that on which the integrated circuit chips of said substrate are mounted.

8. A method for producing a liquid crystal display in which a first substrate having a transparent pixel electrode provided thereon and having a sealing agent, which sections the pixel area, coated thereon, and a second substrate, having a transparent opposed pixel electrode provided thereon are disposed so that both said electrodes face each other, and liquid crystal is sealed in respective pixel areas between said first substrate and said second substrate, thereby making a liquid crystal displaying portion;

integrated circuit chips connected electrically to a transparent conductive electrode are mounted on the surface of the hard transparent substrate having said transparent conductive electrode provided thereon to make the same into a circuit substrate portion; and

the transparent conductive electrode of said circuit substrate portion and the transparent pixel electrode of said liquid crystal displaying portion are electrically connected to each other by flexible connecting means;

comprising the steps of;

producing a single transparent substrate having a large area, which is constructed of a plurality of sets disposed in one or more rows each set consisting of said first substrate portion, said hard transparent substrate portion and said second substrate portion arrayed in this order;

overlapping the first substrate portion, hard transparent substrate portion and second substrate portion of said respective sets so as to be disposed in the opposite direction, using two of said transparent substrates having a large area;

forming a liquid crystal displaying portion area having a liquid crystal-sealed space, which is composed of the first substrate portion, the second substrate portion and a sealing agent, formed therein, said liquid crystal displaying portion being disposed at the position where said overlapped two transparent substrates having a large area are faced to each other;

forming a circuit substrate portion area in which integrated circuit chips are mounted on the hard transparent substrate portion adjacent to said liquid crystal displaying portion area; and

obtaining a plurality of units for producing a liquid crystal display by cutting and separating said two transparent substrates having a large area, in which a plurality of units producing a liquid crystal display, consisting of said obtained liquid crystal displaying portion area and said circuit substrate portion area are arrayed.

9. The method for producing a liquid crystal display as set forth in claim 8, wherein said step for cutting and separating two overlapped transparent substrates having a large area further comprises the step of primarily cutting and separating said plurality of units for producing liquid crystal displays row by row, each row having a plurality of units, respectively, and secondarily cutting and separating one row, which is cut and separated by said primary cutting and separating step, unit by unit, each unit producing respective liquid crystal displays.

10. The method for producing a liquid crystal display as set forth in claim 9, wherein liquid crystal is poured and sealed in respective liquid crystal displaying portion areas in a plurality of units for producing liquid crystal displays in the respective rows in order to obtain liquid crystal displaying portions after said primary cutting and separating step, and said secondary cutting and separating step is carried out thereafter.

11. The method for producing a liquid crystal display as set forth in claim 9, wherein, in order to obtain liquid crystal displaying portions, liquid crystal is poured and sealed in liquid crystal displaying portion areas of said units for producing liquid crystal displays after said primary cutting and separating step or said secondary cutting and separating step.

12. The method for producing a liquid crystal display as set forth in claim 9, wherein integrated circuit chips connected electrically to the transparent conductive electrode are mounted on the surface of the hard transparent substrate portion after said secondary cutting and separating step, and the same is made into a circuit substrate portion.

13. The method for producing a liquid crystal display as set forth in claim 12, wherein the liquid crystal displaying portion of the respective units for producing liquid crystal displays, which is provided with a circuit substrate portion incorporating integrated circuit chips after said secondary cutting and separating step and the circuit substrate portion are cut and separated from each other, and thereafter, the conductive end portions from respective electrodes of the corresponding liquid crystal display and circuit substrate portion are electrically connected to each other by flexible connecting means to obtain a liquid crystal display.

14. The method for producing a liquid crystal display as set forth in claim 13, wherein said flexible connection means is any one of a flexible printed circuit (FPC), a heat seal, a flexible flat cable (FFC) and an anisotropic conductive rubber connector.

15. The method for producing a liquid crystal display as set forth in any one of claims 8 through 14, wherein said first substrate, second substrate and hard transparent substrate are composed of a transparent glass plate or a transparent synthetic resin plate.