JPH01259395A - Liquid crystal display device and its manufacture - Google Patents

Abstract

PURPOSE:To reduce an area of a frame part and to manufacture the title device so as to prevent a disconnection of a lead wire in a bend part by connecting a flexible substrate to the frame part in a bent state, and bending the flexible substrate, while moving a turning axis. CONSTITUTION:A flexible substrate 6 is installed flatly on a jig 12, a rotor 13 is allowed to abut on the lower face of one end part of the substrate 6, turned around the rotation center 14, one end part of the substrate 6 is bent by 180 degrees so that a bent part makes roughly a circular arc shape, and a bend part 8 is formed. In this case, the center 14 is moved in the direction as indicated with an arrow 15, and subsequently, moved in the direction as indicated with an arrow 16, and as a result, the bend part 8 becomes a polygonal shape having plural pieces of bend points. Subsequently, a rotor 17 is turned around the rotation center 18, and also, the center 18 is moved in the direction as indicated with the arrow 15, the other end part of the substrate 6 is bent by 180 degrees so as to make a circular arc shape, and a bend part 7 is formed. Next, the center 18 is moved a little in the direction as indicated with the arrow 16, the bend part 7 is deformed to plural polygonal shapes, and thereafter, the lower face of the bend part 8 is stuck to a panel so that it can conduct electrically.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Field of Industrial Application) The present invention relates to a liquid crystal display device using liquid crystal or the like and a method for manufacturing the same.

(Conventional technology) Recently, in the field of video displays.

Matrix type liquid crystal color televisions have been developed to meet the requirements of low voltage drive, low power consumption, and a light, thin, and small size. There are two types of matrix panels for this type of liquid crystal television: active matrix type and simple matrix type. Active matrix liquid crystal display panel
A plurality of signal electrodes and a plurality of scanning electrodes are arranged in a matrix pattern, and switching transistors and liquid crystal drive electrodes are formed at the intersections of these electrodes to form pixels. The switching transistor operates according to an external signal, and an image is displayed by selecting an arbitrary pixel.

The voltage applied to each liquid crystal drive electrode is statically applied to the liquid crystal. On the other hand, in the case of a simple matrix liquid crystal display panel, a plurality of signal electrodes are formed on one of the overlapping glass substrates, and a plurality of scanning electrodes are formed on the other glass substrate. Both electrodes are arranged in a matrix. A zero image is displayed by selecting an arbitrary pixel using an external signal.

The pixels at the intersection of each electrode are dynamically driven.

In both cases, the signal electrode and the scanning pole are:

It is drawn out to the outer periphery of the pixel area and connected to the output terminal of the LSI. In addition, it is essential to use color filters, and the panel structure must be transparent.
The installation of light sources such as fluorescent lights will become necessary.

By the way, FIG. 14 shows a conventional liquid crystal display module. A wiring area in which wiring electrode 0 is formed is provided at the outer periphery (q) of the pixel area (B) of the liquid crystal display panel, and a liquid crystal driving LSI (2) is mounted directly on the liquid crystal display panel fixing.

Then, each input/output wiring is connected to the pad (F) of the LSI (2). However, in the above structure, the outer periphery of the pixel area of the liquid crystal display panel 4 (wiring area and each pixel electrode u in q)
, (H) to form a mounting area for L8i (5),
Furthermore, in order to supply input signals to the LSI (E), it is necessary to form a region (2) for connection to an external circuit. Therefore, for one pixel area (B), the liquid crystal display panel (5)
becomes something big. In particular, when used in portable equipment with two or three screens, the above-mentioned wiring area and connection area with external circuits are larger than in a single screen size.

(Problems to be Solved by the Invention) The present invention has been made in consideration of the above-mentioned problems, and reduces the area of the non-display part arranged in a frame shape around the display part as one pixel area. The present invention relates to a liquid crystal display device and a method for manufacturing the same.

〔Effect of the invention〕

(Means and effects for solving the problem) In a flat display device having a flat display portion having a flat plate shape and a frame portion supporting the flat display portion in a frame shape,
By connecting the flexible board to the frame part in a bent state and bending the flexible board while moving the rotation axis, it is possible to reduce the area of the frame part and to prevent lead breakage at the bending part. It is designed to prevent this.

(Example) Hereinafter, a liquid crystal display device according to an example of the present invention will be described in detail with reference to the drawings.

1 and 2 show the liquid crystal display device of this embodiment. This device consists of a rectangular liquid crystal display section (1) and a double-edged frame section (2) to which the outer periphery of the liquid crystal display section (1) is connected. Thus, the liquid crystal display section (1) has a rectangular liquid crystal display area (3).

This liquid crystal display frame area (3) is made up of a rectangular panel (4) fixed thereto. On the other hand, frame part (2) ld
, a frame-like frame (5) supporting the panel (4), and a thermoplastic anisotropic conductive sheet in a folded state on this frame (5).

It consists of a flexible substrate (6) connected by an anisotropic conductive rubber connector or the like. One end of the flexible substrate (6) is connected to the upper surface of the peripheral edge of the frame (5), and the other end is connected to the upper surface of the peripheral edge of the panel (4). The flexible substrate (6) has a first bent portion (
7), and a second bent part (8) which is bent into a U-shape on the other end side.

Furthermore, the flexible substrate (6) has a liquid crystal display section (1
) Drive LSI19)..., chemical capacitor 0
Electronic components such as I..., resistors aυ, etc. are mounted, for example, by inner lead bonding. Tsumashi,
The mounting structure of electronic components is becoming multilayered.

As described above, the liquid crystal display device of this embodiment is equipped with electronic components such as an LSI (9) for driving the liquid crystal display section (1), a chemical capacitor (1G), a resistor, etc. The flexible substrate (6) is bent in two stages.

Since it is attached to the frame part (2), the attachment structure of the child parts becomes multi-layered. As a result, the area of the frame portion (2) can be reduced, and the rate of increase in set size due to enlargement of one screen can be reduced.

It is possible to make a flat display device smaller and lower in price.

Moreover, the mounting position of the 7 electronic components can be set at any position above, below, left or right with respect to the pixel area, providing flexibility in design.
Flexibility is increased, and changes in the type of flat display device can be easily accommodated.

Next, a method for manufacturing the liquid crystal display device having the above structure will be described.

First, as shown in FIG. 3, the frame (5) is placed on the jig a2 while the flexible substrate (6) is not bent. Next, the first rotor αJ, which is a flat plate, is
One end of the flexible substrate (6) is brought into contact with the lower surface and rotated around 9 around the rotation center I, and the one end of the flexible substrate (6) is folded 180 degrees so that the bent portion forms an approximately arc shape. , forming a second bent portion (8).

At this time, as shown in FIGS. 4 to 6, the center of one rotation Q
1 in the liquid crystal display area (3) i) in the direction of arrow a9. Next, as shown in FIGS. 7 and 8, the center of one rotation α is slightly moved in the direction away from the liquid crystal display area (3), that is, in the direction of the arrow σ0. As a result, the second bent portion (8) changes from a six-arc shape to a polygonal shape with a plurality of bending points. Subsequently, as shown in FIG. 9, the second rotor αη is rotated around the rotation center a, and the rotation center αQ is moved in the direction of arrow 09, and the other end of the flexible substrate (6) is moved. 1. Bend the part so that the part forms an almost arc shape.
Fold at 80 degrees to form a first arc-shaped bent portion (7).

Next, the second rotation center bracket is slightly moved in the direction of the arrow ae to transform the first bent portion (7) from an arc shape to a polygon shape having a plurality of bending points. After that, the second bending part (8
) is adhered to the panel (4) so as to be electrically conductive.

As described above, in the method for manufacturing a liquid crystal display device of this embodiment, the flexible substrate (6) is connected to the first and second rotors (1
3), use αD to rotate the center of rotation < 14), rotate it to the rotation of ttQ, and when folding the flap 180 degrees, the center of rotation a
4).

Since the Cl119 is moved in the directions of the arrows - and (le) along the liquid crystal surface, the deformation of the flexible substrate (6) due to bending is smoothed, and for example, wire breakage occurs due to bending and breaking of leads with a width of Q and 1 mz. Therefore, the manufacturing yield of flat display devices can be improved.

Note that the first liquid crystal display device is not limited to the liquid crystal display device of the above embodiment.
As shown in Figure 0, one end of the flexible substrate 21) is bonded to the frame (c) that supports the liquid crystal display section (23) by, for example, soldering, and the other end is partially protruded from the bottom surface of the frame (c). For example, it may be bonded to the lower surface of the plate-shaped printed wiring board 4) by soldering or the like. In this case as well, electronic components such as LSI (c)... can be mounted on both the printed wiring board (2) and the flexible board υ over four layers, so the area of the frame can be reduced and the The same effect as the example can be achieved. Further, the number of bending portions of the flexible substrate is not limited to two as in the above embodiment, and any number of new bending portions may be provided as long as possible.

Indeed, the method for manufacturing the liquid crystal display device of the above embodiment is as follows.
and the second rotor -, αη, flexible substrate (6
) is rotated from the center of rotation (+4) to α ~ rotation υ to form an arc shape, and then moved in the direction of the arrow (1e) to transform it into a polygonal shape, but the molding is stopped when it is formed into a 1-arc shape. However, the processing in the direction of the arrow 1e may be omitted. Furthermore, as shown in FIGS. 1 to 13.

When bending the flexible substrate C31) from the rotor mK, the rotation center 0 is set midway through the movement in the direction of arrow α9.
slightly displace it vertically downward (in the direction of arrow (b)).

Furthermore, by slightly displacing K vertically upward (in the direction of the arrow (to)), the bent shape is formed so that it becomes enormous at the end, and the amount of spring bank of the flexible substrate Gυ after bending is reduced. You can. This facilitates bonding of the flexible substrate 13f) in a subsequent process.

Furthermore, although each of the above embodiments is exemplified with respect to a liquid crystal display device, it can be applied to general flat display devices including EL and the like.

〔Effect of the invention〕

The liquid crystal display device of the present invention is as follows. Since the flexible substrate on which electronic components are mounted has a multilayer structure, the area of the frame portion can be made smaller than the area of the display portion. Therefore, it is possible to realize downsizing and lowering the price of the liquid crystal display device. Also.

The mounting position of electronic components can be set anywhere up, down, left, or right, increasing design versatility and flexibility.

It has the advantage of being able to easily adapt to changes in the type of flat display device.

Furthermore, in the liquid crystal display device of the present invention, since the center of one rotation is moved during bending of the flexible substrate, it is possible to prevent wire breakage due to bending and breakage of the leads bonded to the flexible substrate. Therefore, the manufacturing yield of flat display devices can be improved.

[Brief explanation of the drawing]

1 and 2 are a plan view and a sectional view of a main part of a liquid crystal display device according to an embodiment of the present invention, and FIGS. 3 to 9 are explanations of a method for manufacturing a liquid crystal display device according to an embodiment of the present invention. 10 to 13 are explanatory diagrams of other embodiments of the present invention, and FIG. 14 is an explanatory diagram of the prior art. (1): Liquid crystal display section t f2): 7 frame section. (6): 7 lexiple board, (7), (8
): Bent part. (9): LSI (electronic parts). 0 period (center of 1st to 2nd rotation (rotation axis). Agent Patent attorney Nori Yudo Chika Matsuyama Speed of Light Fig. 3 6 Fig. 6 Fig. 7 Fig. 8 Fig. 10 F ''E Fig. 14

Claims (3)

[Claims] (1) In a liquid crystal display device that has a liquid crystal display section and a frame section that supports the liquid crystal display section in the form of a frame, a flexible substrate on which electronic components are mounted is connected to the frame section in a bent state. Characteristic liquid crystal display device. (2) The liquid crystal display device according to claim 1, wherein the flexible substrate has at least two bent portions. (3) A method for manufacturing a liquid crystal display device having a liquid crystal display portion, a frame portion that supports the liquid crystal display portion in a frame shape, and a flexible substrate mounted with electronic components and connected to the frame portion in a bent state. A method for manufacturing a liquid crystal display device, characterized in that a rotation axis of a bending portion of the flexible substrate is moved when the flexible substrate is bent.