JPH0588194A - Liquid crystal display device - Google Patents

Abstract

(57) [Summary] [Structure] The liquid crystal display device of the present invention is particularly applicable to TAB-LS.
I is bent to the electrode substrate side, bent in the opposite direction, and then bent again to the electrode substrate side to connect the liquid crystal panel and the drive circuit substrate. According to the liquid crystal display device of the present invention, TAB-L
Since the SI can be properly stored in the space without significantly protruding from the electrode substrate, the size of the device can be reduced as compared with the conventional device.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid crystal display device, and more particularly to a mounting structure thereof.

[0002]

2. Description of the Related Art In recent years, liquid crystal display devices have come to be used in various fields by taking advantage of their characteristics of light weight and low power consumption.

Generally, as shown in FIG. 3, a liquid crystal display device includes a liquid crystal panel (511), a drive circuit board (801) for driving the liquid crystal panel (511), and a liquid crystal panel (511). A TAB (TapeAutoma) is formed by mounting an IC chip (611) on a wiring film (621) bent in a substantially U shape as a wiring film for connecting to a circuit board (801).
ted Bonding) -LSI (601).

A liquid crystal panel (11) as shown in FIG.
In a liquid crystal display device (501) including a backlight device (701) for irradiating light from the backside, the backlight device (701) is installed between the liquid crystal panel (511) and the drive circuit board (801). It has a structure.

[0005]

By the way, in the above-mentioned structure, since the TAB-LSI (601) is bent in a substantially U-shape, the liquid crystal panel (611) has a T-shape.
The AB-LSI (601) was protruding to the outside. Therefore, as a matter of course, the outer frame for accommodating the liquid crystal display device (501) becomes larger than the liquid crystal panel (511), resulting in an increase in size of the device. The present invention has been made to solve the above-mentioned problems, and an object thereof is to achieve further miniaturization of a liquid crystal display device.

[0006]

A liquid crystal display device according to the present invention comprises a liquid crystal panel having a display portion formed by sandwiching a liquid crystal composition between a pair of electrode substrates, and an edge portion of at least one of the electrode substrates. A liquid crystal display device comprising: a wiring film to be connected; and a drive circuit board connected to the wiring film and installed on a side opposite to a display portion of a liquid crystal panel, wherein the wiring film is formed from an end portion of an electrode substrate. The first bent portion is bent toward the end portion side, the second bent portion is bent toward the side opposite to the first bent portion, and the third bent portion is further bent.
It is characterized in that it is bent toward the end side through the bent portion.

[0007]

In the liquid crystal display device of the present invention, the wiring film connecting the liquid crystal panel and the drive circuit board as described above has at least three bent portions. For this reason, it is possible to eliminate the outward protrusion of the wiring film by wrapping the wiring film inward, and it is possible to install an outer frame having substantially the same size as the liquid crystal panel. Therefore, according to the present invention, it is possible to further reduce the size of the liquid crystal display device.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A liquid crystal display device according to an embodiment of the present invention will be described in detail below with reference to the drawings.

FIG. 1 is a schematic perspective view of the liquid crystal display device according to this embodiment, and FIG. 2 is a schematic sectional view taken along the line AA 'of the liquid crystal display device in FIG. It is a thing.

This liquid crystal display device (1) has a first electrode substrate.
A liquid crystal panel (11) having a TN type liquid crystal composition (not shown) sandwiched between the (21) and the second electrode substrate (51), and a flexible film made of polyimide. A TAB-LSI (101) in which an IC chip (111) is installed on a wiring film (121) having a wiring pattern formed on the front surface, and a sidelight device (2) that emits light from the back surface of a liquid crystal panel (11)
01) and a drive circuit board (301) on which a driver circuit for driving the liquid crystal panel (11) and the like are formed.
The first electrode substrate (21) of the liquid crystal panel (11) has a plurality of stripe-shaped first electrodes (not shown) extending in the X direction in the figure, and the second electrode substrate (51). ) Has a plurality of stripe-shaped second electrodes (not shown) extending in the Y direction in the figure. Then, the liquid crystal composition at the intersection of the first electrode and the second electrode responds with the application of a voltage, and the liquid crystal panel (11) displays.

The first electrode is converged on one end portion (23) of the first electrode substrate (21) protruding from the second electrode substrate (51), and T
The first connection part formed at one end of the AB-LSI (101)
It is connected to (131) by an anisotropic conductive film.

The wiring film (121) of the TAB-LSI (101) is composed of the connecting portion (131) and the first bent portion.
It is bent to the side light device (201) side via (141a), and is bent in the opposite direction to the first bent part (141a) via the second bent part (141b). Furthermore,
The wiring film (121) of the TAB-LSI (101) is again provided with the side light device (201) via the third bent portion (141c).
It is bent to the side.

Each of these bent portions (141a), (141b), (141c)
Has a notch formed on the main surface of the wiring film (121) where the wiring pattern is not formed.
Maintaining the shape of I (101), or TAB-LSI (101)
It is configured to ensure the ease of bending. This cut may be formed by removing the surface of the wiring film (121) or may be formed by applying heat pressure.
The second connection portion (133) formed at the other end of the TAB-LSI (101) is connected to the drive circuit board (301).

Further, the sidelight device (201) is provided with a light emitting part (211) on the side of the other end (25) opposite to the one end (23) of the first electrode substrate (21), and this light emission A light guide plate (221) for converting light from the section (211) into a planar light is provided, and is installed between the liquid crystal panel (11) and the drive circuit board (301).

Thus, the liquid crystal display device (1) of this embodiment
The TAB-LSI (101) is arranged in a substantially Σ shape so that the TAB-LSI (101) can be accommodated in the space between the first electrode substrate (21) and the drive circuit substrate (301). You can This allows the TAB- from the first electrode substrate (21).
The LSI (101) does not protrude significantly and the LCD panel (1
It is possible to install an outer frame of the same size as 1).
Therefore, the liquid crystal display device (1) of this embodiment can be downsized as compared with the conventional device. In other words, the effective display area can be made sufficiently larger than the size of the liquid crystal display device (1) as a whole.

Further, in the conventional liquid crystal display device, when the size of the backlight device is different, the liquid crystal display device is arranged in a substantially U shape.
In the AB-LSI, the amount of outward protrusion is different. For example, when the backlight device is thin, the outward projection amount of the TAB-LSI is large, and when the backlight device is thick, the outward projection amount of the TAB-LSI is small. Therefore, in the conventional liquid crystal display device, the TAB-LSI which is different only when the thickness of the backlight device is slightly changed.
There was also a need to prepare or a different outer frame.

On the other hand, the liquid crystal display device of this embodiment
According to (1), the space between the first electrode substrate (21) and the drive circuit substrate (301) can be used effectively even when the sidelight devices (201) have different thicknesses. TAB-LSI (1
Since 01) is stored, even if the same TAB-LSI (101) with the same liquid crystal panel (11) is used, the TAB-LSI (1
01) does not protrude outwards.

Therefore, the same liquid crystal panel (11) and TAB-
Combination with LSI (101) for various sidelight devices
It can be used in combination with (201) and is very economical.

TA of the liquid crystal display device (1) of the above-mentioned embodiment
The B-LSI (101) has three bent portions (141a), (141b),
Although it is configured by (141c) in a substantially Σ shape and arranged, it may have a sawtooth shape with an odd number of bent portions of 3 or more.

However, if the bending portion of the TAB-LSI (101) is excessively increased with respect to the distance between the first electrode substrate (21) and the drive circuit board (301), the bending portion is undesired. It is not preferable to increase the number of bent portions too much, because pressure may be applied and the wiring pattern on the surface of the wiring film (121) may be broken.

Further, the liquid crystal display device (1) of the above-mentioned embodiment
As the liquid crystal panel (11), a simple matrix type is shown as an example, but the present invention is not limited to this, and is also effective for a liquid crystal display device using an active matrix type liquid crystal panel. It goes without saying that it works.

[0022]

According to the liquid crystal display device of the present invention, the TAB
-The LSI can be properly stored in the space without significantly protruding from the electrode substrate. Therefore, the size of the device can be reduced as compared with the conventional one.

[Brief description of drawings]

FIG. 1 is a schematic perspective view of a liquid crystal display device according to an embodiment of the present invention.

FIG. 2 is a schematic cross-sectional view of the liquid crystal display device in FIG. 1 taken along the line AA ′.

FIG. 3 is a schematic perspective view of a conventional liquid crystal display device.

[Explanation of symbols]

 (1), (501) ... liquid crystal display device (11), (511) ... liquid crystal panel (101), (601) ... TAB-LSI (301), (801) ... drive circuit board

Claims (1)

[Claims] 1. A liquid crystal panel in which a display portion is formed by sandwiching a liquid crystal composition between a pair of electrode substrates, a wiring film connected to an end portion of at least one of the electrode substrates, and the wiring film. In a liquid crystal display device including a drive circuit board connected to and installed on the opposite side of the liquid crystal panel from the display section, the wiring film is provided from an end of the electrode board through a first bent section. It is bent to the end portion side, is bent to the side opposite to the first bent portion via the second bent portion, and is further bent to the end portion side via the third bent portion. Characteristic liquid crystal display device.