JPH04295822A - Flexible film holding structure for liquid crystal display device - Google Patents

Abstract

PURPOSE:To prevent the warp and distortion of a flexible film and to improve the display performance and reliability of a liq. crystal display device. CONSTITUTION:This flexible film holding structure used for a liq. crystal display device is composed essentially of upper and lower substrates 1, 2 having holes 1a, 2a at the four corners and made of a transparent insulating film and a support member 6 supporting the substrates 1, 2 and having projections 6a inserted into the holes 1a, 2a. Tension is applied to the substrates 1, 2 in the diagonal directions by inserting the projections 6a into the holes 1a, 2a.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure for holding a flexible film for a liquid crystal display device.

0002

2. Description of the Related Art In recent years, flexible films have been used as liquid crystal substrates and polarizing plates constituting liquid crystal cells in liquid crystal display devices. In the manufacturing process of the liquid crystal display panel portion of a liquid crystal display device, processes such as thin film formation and patterning are repeated on these substrates, which increases the number of times the substrates are transported. For this reason, transport methods have been proposed that prevent warping and the like from occurring during board transport.
JP-A-1-248127 and JP-A-2-33122
The one described in the publication No. 1 is known. In the devices described in these documents, a hole is formed at one end of the substrate, and a protrusion formed on a conveyance handle is engaged with this hole, so that the substrate is hung and conveyed.

0003

[Problems to be Solved by the Invention] However, the method for transporting liquid crystal substrates, etc. described in the above-mentioned publication is merely for preventing warping of the substrate during the manufacturing process of the liquid crystal display panel portion of the liquid crystal display device. It is not possible to prevent the substrate from being warped or distorted after manufacturing the liquid crystal display panel portion, resulting in a problem that the display performance and reliability of the liquid crystal display device deteriorates.

That is, when a completed liquid crystal display panel is placed in a high temperature and high humidity environment, the expansion and contraction ratios in the axial direction of the liquid crystal substrate made of a polymer film and the polarizing film are different, and the film has no rigidity. As a result, large warps and distortions occur, and these warps and distortions do not go away even after being returned to normal temperature and humidity. Therefore, the present invention applies tension in the diagonal direction to the flexible film supported by the support member to prevent warping and distortion of the flexible film, thereby improving the display performance and reliability of the liquid crystal display device. The challenge is to do so.

[0005]

[Means for solving the problem] The invention according to claim 1 includes:
In order to solve the above problems, the flexible film is used in a liquid crystal display device and has a hole at each of the four corners, and a projection that engages with the hole at the four corners of the flexible film. and a support member for supporting the flexible film, and tension in a diagonal direction is applied to the flexible film by engagement between the hole in the flexible film and the protrusion of the support member. In order to solve the above problem, the invention according to claim 2 is characterized in that the flexible film according to claim 1 is composed of at least one of a pair of transparent insulating films encapsulating a liquid crystal material, In order to solve the above problem, the invention according to claim 3 is characterized in that the flexible film according to claim 1 consists of at least one of a pair of polarizing films, and the invention according to claim 4 In order to solve the above problem, the flexible film of claim 1 is characterized in that it consists of at least one of a pair of transparent insulating films encapsulating a liquid crystal material and at least one of a pair of polarizing films, Claim 5
In order to solve the above-mentioned problems, the invention described in Claims 1 to 4 is characterized in that the supporting member is made of a rigid member having a light reflecting surface, and the invention described in Claim 6 is characterized in that: In order to solve the above problems, the support member according to claims 1 to 4 is characterized in that it is made of an aluminum plate having a thickness of 0.5 mm or more and having a light reflecting surface.

[0006]

[Function] In the invention according to claims 1 to 6, when tension is applied to the flexible film in a diagonal direction, and the liquid crystal display panel of the liquid crystal display device is constituted by the flexible film and the supporting member, After the panel is completed, the flexible film is prevented from warping or distorting.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be explained below based on the drawings. FIG. 1 is a diagram showing a first embodiment of a holding structure for a flexible film for a liquid crystal display device according to the invention as claimed in claims 1 and 2, and is an example applied to a transmission type liquid crystal display device.

First, the configuration will be explained. In Figure 1, 1
2 is a transparent insulating film upper substrate, and 2 is a transparent insulating film lower substrate. Transparent electrodes are arranged on the inner surfaces of each of the transparent insulating film upper and lower substrates 1 and 2, and a liquid crystal material is injected and sealed between the two substrates. Further, holes 1a and 2a are formed in the four corners of the transparent insulating film upper and lower substrates 1 and 2, and an upper polarizing film 3 and a lower polarizing film 4 are adhered to both substrates, respectively. on transparent insulating film,
The lower substrates 1 and 2 and the upper and lower polarizing films 3 and 4 constitute a liquid crystal display element, and when a drive circuit (not shown) is mounted on the liquid crystal display element, a liquid crystal display panel 5 is constituted. The support member 6 on which the liquid crystal display panel 5 is attached has a protrusion 6a.
is formed, and when the liquid crystal panel 5 is attached, the protrusion 6a
are engaged with the holes 1a and 2a of the transparent insulating film upper and lower substrates 1 and 2. The engagement between the protrusion 6a and the holes 1a and 2a applies tension in the diagonal direction to the transparent insulating film upper and lower substrates 1 and 2. Although this embodiment has been described using a transmissive liquid crystal display device as an example, if a reflective plate (not shown) in contact with the lower polarizing film 4 is provided, the liquid crystal display device becomes a reflective liquid crystal display device.

[0009] According to the above-described configuration, tension is applied to the transparent insulating film upper and lower substrates 1 and 2 in the diagonal direction, so that when the liquid crystal display panel 5 is placed in a high temperature and high humidity environment, However, even when the transparent insulating film upper and lower substrates 1 and 2 are returned to normal temperature and humidity environments, warping and distortion can be prevented from occurring, and the upper and lower polarizing films 3 and 4 Since the transparent insulating films are adhered to the upper and lower substrates 1 and 2, it is possible to prevent the upper and lower polarizing films 3 and 4 from being warped or distorted. Therefore, reliability and display performance of the liquid crystal display device can be improved.

FIG. 2 shows a second structure for holding a flexible film for a liquid crystal display device according to the first and second aspects of the invention.
It is a figure which shows an Example, and is also a figure which shows one Example of the holding structure of the flexible film for liquid crystal display devices of Claim 5 and Claim 6, and is an example applied to a reflective liquid crystal display device. . In FIG. 2, the same components as in the first embodiment shown in FIG. 1 are denoted by the same reference numerals and their explanations are omitted, and the same applies to the following embodiments.

In FIG. 2, ears 11b and 12b are formed at the four corners of the transparent insulating film upper and lower substrates 11 and 12, and holes 11a and 12a are formed in the ears 11b and 12b, respectively. A liquid crystal display element is constituted by the transparent insulating film upper and lower substrates 11 and 12 and the upper and lower polarizing films 3 and 4, and a drive circuit (not shown) is mounted thereon to constitute the liquid crystal display panel 15. The liquid crystal display panel 15 has a thickness of 0.5
It is placed on an aluminum plate 16 with a diameter of mm or more. Aluminum plate 16
has a mirror-treated reflective surface, and the aluminum plate 16 has a hole 11.
A protrusion 16a is formed which engages with a and 12a. The engagement between the protrusion 16a and the holes 11a and 12a applies diagonal tension to the transparent insulating film upper and lower substrates 11 and 12. In this example,
Although the aluminum plate 16 is used, a rigid member made of other rigid materials may also be used, such as a resin material such as an acrylic plate with a reflective coating such as a vapor-deposited aluminum layer, or stainless steel with a similar reflective coating. It may also be a metal material such as a plate.

As mentioned above, in this embodiment, the holes 11a, 1
2a are formed on the upper transparent insulating film and on the ears 11b and 12b formed at the four corners of the lower substrates 11 and 12, so in addition to the effects of the first embodiment described above, the degree of freedom in wiring the transparent electrodes is expanded. This makes it possible to easily implement the drive circuit. Furthermore, since the aluminum plate 16 is disposed under and in contact with the lower polarizing film 4, it is possible to provide a film substrate holding structure for a reflective liquid crystal display device.

FIG. 3 is a view showing a first embodiment of a holding structure for a flexible film for a liquid crystal display device according to the third aspect of the invention. In FIG. 3, 21 is a transparent insulating film upper substrate, and 22 is a transparent insulating film lower substrate. Transparent electrodes are arranged on the inner surfaces of each of the transparent insulating film upper and lower substrates 21 and 22, and a liquid crystal material is injected between the two substrates.
It is sealed. In addition, the transparent insulating film upper and lower substrates 21
, 22 are bonded with an upper polarizing film 23 and a lower polarizing film 24, respectively.
Holes 23a and 24a are formed at the four corners of 4. A liquid crystal display element is constituted by upper and lower transparent insulating film substrates 21 and 22 and upper and lower polarizing films 23 and 24, and a liquid crystal display panel 25 is constituted by mounting a drive circuit (not shown). A protrusion 26a is formed on the support member 26 of the device to which the liquid crystal display panel 25 is attached, and when the liquid crystal panel 26 is attached, the protrusion 26a is attached to the upper and lower polarizing films 23.
, 24 are engaged with the holes 23a and 24a. This protrusion 26a
Due to the engagement between the holes 23a and 24a, tension is applied to the upper and lower polarizing films 23 and 24 in the diagonal direction. Although this embodiment has been described using a transmission type liquid crystal display device as an example, if a reflection plate (not shown) in contact with the lower polarizing film 24 is provided, the device becomes a reflection type liquid crystal display device.

According to the above structure, since tension is applied to the upper and lower polarizing films 23 and 24 in the diagonal direction, even when the liquid crystal display panel 25 is placed in a high temperature and high humidity environment, Furthermore, even if the environment is returned to normal temperature and humidity,
It is possible to prevent the upper and lower polarizing films 23 and 24 from being warped or distorted, and the transparent insulating film is
Since the lower substrates 21 and 22 are bonded to the upper and lower polarizing films 3 and 4, the transparent insulating films are attached to the upper and lower substrates 21 and 22.
It is also possible to prevent warping and distortion. Therefore, reliability and display performance of the liquid crystal display device can be improved.

FIG. 4 is a diagram showing a second embodiment of a holding structure for a flexible film for a liquid crystal display device according to claim 3, and a flexible film for a liquid crystal display device according to claims 5 and 6. It is also a diagram showing an example of a holding structure. In FIG. 4, ears 33 are provided at the four corners of the upper and lower polarizing films 33 and 34.
b, 34b are formed, and holes 33a, 34a are formed in the ears 33b, 34b. Transparent insulating film upper and lower substrates 21 and 22 and upper and lower polarizing films 33 and 3
4 constitutes a liquid crystal display element, and when a drive circuit (not shown) is mounted, a liquid crystal display panel 35 is constituted. The liquid display panel 35 is placed on an aluminum plate 36 having a thickness of 0.5 mm or more and having a light reflecting surface. Hole 33 in aluminum plate 36
A protrusion 36a that engages with the holes 33a and 34a is formed, and tension in the diagonal direction is applied to the upper and lower polarizing films 33 and 34 by engagement between the protrusion 36a and the holes 33a and 34a. In this embodiment, an aluminum plate 36 is used, but a member made of other rigid materials may also be used, such as a resin material such as an acrylic plate coated with a reflective coating such as a vapor-deposited aluminum layer, or a similar reflective material. It may also be a metal material such as a coated stainless steel plate.

As mentioned above, in this embodiment, the holes 33a, 3
4a are formed on the ears 33b and 34b formed at the four corners of the upper and lower polarizing films 33 and 34, so that the first
In addition to the effects of the embodiment, the degree of freedom in wiring the transparent electrodes can be expanded, and the mounting of the drive circuit can be facilitated. Further, since the aluminum plate 36 as a reflective plate is disposed under and in contact with the lower polarizing film 34, it is possible to provide a film substrate holding structure for a reflective liquid crystal display device.

FIG. 5 is a diagram showing a first embodiment of a holding structure for a flexible film for a liquid crystal display device according to the fourth aspect of the invention. In FIG. 5, 41 is a transparent insulating film upper substrate, and 42 is a transparent insulating film lower substrate. Transparent electrodes are arranged on the inner surfaces of each of the transparent insulating film upper and lower substrates 41 and 42, and a liquid crystal material is injected between the two substrates.
It is sealed. In addition, the transparent insulating film upper and lower substrates 41
, 42 are bonded with an upper polarizing film 43 and a lower polarizing film 44, respectively, and holes 41a, 42a, 43a and 44a are formed. Transparent insulation film upper and lower substrates 41, 42
The upper and lower polarizing films 43 and 44 constitute a liquid crystal display element, and when a drive circuit (not shown) is mounted, a liquid crystal display panel 45 is constituted. A protrusion 46a is formed on the support member 46 of the device to which the liquid crystal display panel 45 is attached, and the protrusion 46a closes in the hole 41 when the liquid crystal display panel 45 is attached.
a, 42a, 43a, 44a. Due to this engagement, the upper and lower substrates 41, 42 and the upper transparent insulating film,
Tension is applied to the lower polarizing films 43 and 44 in the diagonal direction. Although this embodiment has been described using a transmissive liquid crystal display device as an example, if a reflective plate (not shown) in contact with the lower polarizing film 44 is provided, the liquid crystal display device becomes a reflective liquid crystal display device.

According to the above structure, the transparent insulating film upper and lower substrates 41 and 42 and the upper and lower polarizing films 4
Since the tension in the diagonal direction is applied to both 3 and 44, even if the liquid crystal display panel 45 is placed in a high temperature and high humidity environment, and even if it is returned to a normal temperature and humidity environment, the transparent insulation It is possible to prevent the upper and lower film substrates 41 and 42 and the upper and lower polarizing films 43 and 44 from being warped or distorted. Therefore, reliability and display performance of the liquid crystal display device can be improved.

FIG. 6 is a diagram showing a second embodiment of a holding structure for a flexible film for a liquid crystal display device according to claim 4, and a flexible film for a liquid crystal display device according to claims 5 and 6. It is also a diagram showing an example of a holding structure. In FIG. 6, the transparent insulating film upper, lower substrates 51, 52 and upper,
Ear portions 51b, 52 are provided at the four corners of the lower polarizing films 53, 54.
b, 53b, 56b are formed, and the ears 51b, 5
Holes 51a, 52a, 53a, 5 in 2b, 53b, 54b
4a is formed. Transparent insulation film upper and lower substrates 5
1 and 52 and the upper and lower polarizing films 53 and 54 constitute a liquid crystal display element, and when a drive circuit (not shown) is mounted, a liquid crystal display panel 55 is constituted. The liquid crystal display panel 55 is placed on an aluminum plate 56 having a reflective surface and having a thickness of 0.5 mm or more, with the lower polarizing film 54 facing down. The aluminum plate 56 is formed with protrusions 56a that engage with the holes 51a, 52a, 53a, and 54a, and the protrusions 56a and the holes 51
By engagement with the transparent insulating film upper and lower substrates 51 and 52 and the upper and lower polarizing films 53 and 54, tension is applied in the diagonal direction. In this embodiment, an aluminum plate 56 is used, but a member made of other rigid materials may also be used, such as a resin material such as an acrylic plate coated with a reflective coating such as a vapor-deposited aluminum layer, or a similar reflective material. It may also be a metal material such as a coated stainless steel plate.

As mentioned above, in this embodiment, the holes 51a, 5
2a, 53a, 54a on transparent insulating film, lower substrate 5
1, 52, and the ears 51b, 52b, 53b, and 54b formed at the four corners of the upper and lower polarizing films 33 and 34, in addition to the effects of the first embodiment described above, the wiring of the transparent electrodes is improved. The degree of freedom can be expanded, and the implementation of the drive circuit can be facilitated. Further, since the aluminum plate 56 as a reflection plate is disposed under and in contact with the lower polarizing film 54, it is possible to provide a film substrate holding structure for a reflective liquid crystal display device.

[0021] In the above embodiments, one hole is formed in each of the four corners of the flexible film, but the number of holes is not limited to this, and the tension in the diagonal direction is Any number is fine as long as it is given. Further, forming ears at the four corners of the flexible film may be applied to any of the embodiments, and it goes without saying that the embodiments may be combined with each other.

[0022]

According to the invention described in claims 1 to 6, since tension is applied to the flexible film in the diagonal direction, it is possible to prevent warpage and distortion of the flexible film. , the display quality and reliability of the liquid crystal display device can be improved.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing a first embodiment of a holding structure for a flexible film for a liquid crystal display device according to the invention as claimed in claims 1 and 2, in which (a) is a top view thereof, and (b) is a top view thereof; FIG.

FIG. 2 is a diagram showing a second embodiment of a holding structure for a flexible film for a liquid crystal display device according to the invention as claimed in claims 1 and 2, in which (a) is a top view thereof, and (b) is a top view thereof; FIG.

FIG. 3 is a diagram showing a first embodiment of a holding structure for a flexible film for a liquid crystal display device according to the invention as claimed in claim 3;
(a) is a top view thereof, and (b) is a side view thereof.

FIG. 4 is a diagram showing a second embodiment of a holding structure for a flexible film for a liquid crystal display device according to the invention as claimed in claim 3;
(a) is a top view thereof, and (b) is a side view thereof.

FIG. 5 is a diagram showing a first embodiment of a holding structure for a flexible film for a liquid crystal display device according to the invention as claimed in claim 4;
(a) is a top view thereof, and (b) is a side view thereof.

FIG. 6 is a diagram showing a second embodiment of a holding structure for a flexible film for a liquid crystal display device according to the invention as claimed in claim 4;
(a) is a top view thereof, and (b) is a side view thereof.

[Explanation of symbols]

1, 11, 21, 41, 51 Transparent insulation film upper substrate (flexible film) 2, 12, 22, 41, 51 Transparent insulation film lower substrate (flexible film) 3, 23, 33, 43, 53 Upper Polarizing film (flexible film) 4, 24, 34, 44, 54 Lower polarizing film (flexible film) 6, 26, 46 Support member 16, 36, 56 Aluminum plate

Claims (6)

[Claims] Claim 1: Used in a liquid crystal display device, comprising a flexible film having holes at each of the four corners, and projections that engage with the holes at the four corners of the flexible film to support the flexible film. and a support member, wherein tension is applied to the flexible film in a diagonal direction by engagement between the hole of the flexible film and the protrusion of the support member. Flexible film retention structure. 2. The holding structure for a flexible film for a liquid crystal display device according to claim 1, wherein the flexible film comprises at least one of a pair of transparent insulating films encapsulating a liquid crystal material. 3. The holding structure for a flexible film for a liquid crystal display device according to claim 1, wherein the flexible film is made of at least one of a pair of polarizing films. 4. The flexible film for a liquid crystal display device according to claim 1, wherein the flexible film comprises at least one of a pair of transparent insulating films encapsulating a liquid crystal material and at least one of a pair of polarizing films. Retention structure of sexual film. 5. The holding structure for a flexible film for a liquid crystal display device according to claim 1, wherein the supporting member is made of a rigid member having a light reflecting surface. 6. The support member has a light reflecting surface and has a thickness of 0.
The holding structure for a flexible film for a liquid crystal display device according to any one of claims 1 to 4, characterized in that it is made of an aluminum plate of 5 mm or more.