JP3259468B2 - Liquid crystal display device and electronic display device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a flexible substrate.
The present invention relates to a liquid crystal display element and an electronic display device used.

[0002]

2. Description of the Related Art A conventional technique will be described with reference to FIG. The liquid crystal display element 1 includes an upper substrate 11 and a lower substrate 12 each having a transparent electrode formed on an inner surface thereof having a thickness of about 100 μm, which is easy to be thin and lightweight.
And a flexible film such as polyester, polyethersulfone, or polycarbonate is used as a material for the substrate. Between the two substrates 11 and 12 with a transparent electrode, the substrate is substantially horizontal. Oriented in a thickness direction of 120 ° or more and 360 ° or less, for example, 180 °
A liquid crystal cell having a liquid crystal layer exhibiting a positive dielectric anisotropy and having a structure twisted at a torsion angle, and a pair of upper and lower polarizers 21 and 22 disposed so as to sandwich the liquid crystal cell. The upper polarizing plate 21 and the lower polarizing plate 22 are
It is installed in a region immediately before (a display portion) of one electrode terminal portion 23. As a drive circuit board, a TAB board 25 in which a liquid crystal drive semiconductor element 27 is gang-bonded to an FPC (flexible print circuit) board is connected via an anisotropic conductive film. The drive circuit board 2 is connected to the connection electrodes of the TAB board by soldering.

[0003]

However, in the above-mentioned prior art, since the electrode terminals of the liquid crystal display element are formed of a single flexible plastic film, they are handled in the manufacturing process or when incorporated into an electronic display device. In this case, when an external force is applied, the electrode terminal is easily bent, and a terminal electrode crack is generated, which may lead to disconnection. In addition, when the exposed electrode of the electrode terminal portion is touched, the terminal electrode may be damaged or stained, leading to disconnection. Furthermore, when the electrode terminal portion is pressurized by being fixed to the electronic display device, the substrate edge facing the electrode terminal portion forming substrate is pressed against the terminal electrode, which may cause cracks and disconnection. there were. In other cases, the connection electrodes of the TAB substrate may be disconnected without fixing the drive circuit portion. Therefore, the handling of a liquid crystal display device using a flexible substrate such as a plastic film must be handled very delicately, leading to an increase in man-hours and a decrease in yield in a production process. was there.

Accordingly, the present invention is to solve such a problem, and an object of the present invention is to provide a highly reliable liquid crystal display element which is easy to handle and does not cause disconnection of terminal electrodes.

[0005]

In order to solve the above problems, a liquid crystal display device according to the present invention comprises a pair of flexible bases.
A liquid crystal cell having a plate, and one of the pair of substrates
Liquid Crystal Display Element Having Driving Circuit Member Connected to Substrate
The polarizing plate is attached to the other substrate
The polarizing plate is provided so as to extend to the drive circuit member.
And supporting the drive circuit member.
And Further, a liquid crystal driving semiconductor element is mounted on the driving circuit member, and the driving circuit member is supported by the polarizing plate on a side opposite to a surface on which the liquid crystal driving semiconductor element is mounted. It is characterized by. The driving circuit member includes a TAB substrate on which a liquid crystal driving semiconductor element is mounted, and a driving circuit substrate.
The driving circuit board is supported by the polarizing plate. An electronic display device according to the present invention includes the liquid crystal display element described above. Further, the liquid crystal display element has a curved surface structure.

[0006]

【Example】

[Embodiment 1] An embodiment of the present invention will be described below with reference to FIG.

FIG. 1 is a sectional view of a liquid crystal display device of the present invention.
11 is an upper substrate, 12 is a lower substrate, 13 and 14 are transparent electrodes made of an ITO (indium tin oxide) film, 18 is a sealant, 19 is a liquid crystal, 23 is an electrode terminal, 21 is an upper polarizing plate, 22 Is a lower polarizing plate.

In the liquid crystal display device of the present invention, a predetermined pattern is formed on the upper substrate 11 and the lower substrate 12 of a plastic substrate by a low-temperature sputtering method. An alignment film of polyimide or the like is formed thereon by offset printing, and the film is formed by firing. Next, the surface of the alignment film was rubbed with a cloth in a certain direction to perform an alignment treatment. Next, an epoxy-based adhesive containing a predetermined gap agent was screen-printed, and spacers were sprayed on the upper and lower substrates 11 and 12 by a wet spray method to bond the two substrates to each other. The spray density of the spacers was 150 / mm ² , then the liquid crystal 19 was filled by a vacuum injection method, and the injection portion was sealed with an epoxy adhesive. After forming the liquid crystal cell 20 in this manner, the liquid crystal cell 2
The upper polarizer 21 and the lower polarizer 22 are attached to the respective surfaces of the upper substrate 11 and the lower substrate 12 to the position where the electrode terminal portion 23 is extended and the drive circuit member 24 is covered. . The driving circuit member 24 includes a TAB substrate 25 and the driving circuit substrate 2. The TAB substrate 25 has a liquid crystal driving semiconductor element 27 mounted on a flexible substrate such as polyimide by gang bonding. The drive circuit board 2 is configured by wiring one or more layers of circuits on a board made of a material such as glass epoxy or paper phenol. Upper polarizing plate 21
And the lower polarizing plate 22 are attached to each other at a position where the region of the drive circuit member 24 extends. At this time, the drive circuit board 2 of the drive circuit member 24 is attached and fixed to the lower polarizing plate 22.

In the drawing, TA is used as a drive circuit member.
The combination of the B board and the circuit board has been described, but the combination of the circuit members may be any combination of the TAB board and the FPC, the heat seal and the COB board, and the heat seal and the QFP mounting board. Further, the upper and lower polarizing plates can be attached before or after the mounting of the drive circuit member.

[Embodiment 2] This embodiment will be described below with reference to FIG.

FIG. 2 is an application example of the first embodiment. The basic method of manufacturing the liquid crystal display element 1 is the same as that of the first embodiment, but the upper polarizing plate 21 to be attached on the upper substrate 11 is The lower polarizing plate 22 attached to the same region and attached to the lower substrate 12 is attached to the same region as the drive circuit member 24. At this time, the drive circuit board 2 which is the drive circuit member 24 is adhered and fixed to the lower polarizing plate 22. Note that the upper polarizing plate 21 on the upper substrate 11 may be attached at the same region as the sealant 18 at the sticking position.

[Embodiment 3] This embodiment will be described below with reference to FIG.

FIG. 3 shows one embodiment in which the liquid crystal display element of the second embodiment is incorporated in an electronic display device. The basic method of manufacturing the liquid crystal display element 1 is the same as in the first and second embodiments.
FIG. 3 is a view in which is incorporated in a case 33 of the electronic display device.
Since the liquid crystal display element and the drive circuit unit are integrated and supported by the polarizing plate, handling is easy when incorporated in the case 33, and disconnection failure in the manufacturing process can be prevented.
The electronic display device according to the present embodiment can be applied to a calculator, an electronic organizer, a pager, a personal computer of a notebook size, a PDA such as a small information portable device of VGA specification, and the like. The liquid crystal display element to be incorporated in the electronic display device is the same as in the first and second embodiments
Either of them may be used, and a deformation such as a curved surface shape is also possible.

[0014]

According to the present invention, one of a pair of substrates is provided.
And a drive circuit member connected to one of the substrates.
A polarizing plate is attached to the plate, and the polarizing plate is
A drive circuit member provided to extend to the motion circuit member;
The drive circuit member and the liquid crystal cell are fixed.
As a result, a highly reliable liquid crystal display element in which disconnection of the electrode terminal portion does not occur can be provided.

[Brief description of the drawings]

FIG. 1 is a sectional view of a liquid crystal display device according to a first embodiment.
You.

FIG. 2 is a sectional view of a liquid crystal display device according to a second embodiment.
You.

FIG. 3 is a diagram showing a liquid crystal display incorporating a liquid crystal display element according to a second embodiment .
It is sectional drawing of a child display device.

FIG. 4 is a cross-sectional view of a liquid crystal display device according to a conventional example.

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) G02F 1/1335 510 G02F 1/1343

Claims (5)

(57) [Claims] A liquid crystal cell having a pair of flexible substrates.
Connected to one of the pair of substrates.
In the liquid crystal display device including the driving circuit member, a polarizing plate is attached to the other substrate, and the polarizing plate extends to the driving circuit member.
And supports the drive circuit member.
Liquid crystal display device. 2. The liquid crystal display device according to claim 1, wherein a semiconductor element for driving a liquid crystal is mounted on the driving circuit member, and a side opposite to a surface on which the semiconductor element for driving the liquid crystal is mounted, A liquid crystal display device, wherein the driving circuit member is supported by the polarizing plate. 3. The liquid crystal display device according to claim 2, wherein the drive circuit member comprises a TAB substrate on which a semiconductor element for driving a liquid crystal is mounted, and a drive circuit substrate. A liquid crystal display element supported by a polarizing plate. 4. An electronic display device comprising the liquid crystal display element according to claim 1. 5. The electronic display device according to claim 4, wherein said liquid crystal display element has a curved surface structure.