JPH04315126A - Holding structure of liquid crystal display device - Google Patents

Abstract

PURPOSE:To suppress the weight and cost of a liquid crystal display device and to prevent the generation of warpage, etc., by holding this device by means of a holding member and embedding a heating resistor into the mounting part. CONSTITUTION:The mounting part 15a of the holding member 15 is mounted on the outer peripheral surface of a film substrate 11 and this mounting part 15a is so fixed to the substrate 11 by the adhesive 16 so as to enclose the display surface of the liquid crystal display device 14. The holding member 15 is constituted of resin materials, such as acryl and polycarbonate. The heating resistor 17 is embedded into the mounting part 15a and is disposed in the outer peripheral part of the film substrate 11 so as to enclose the display surface. This heating resistor 17 is constituted of a nickel-chromium wire or 'KantalR' wire. Since the heating resistor is provided in the mounting part 15a in such a case, the relative humidity can be controlled to a lower level by heating the heating resistor 17 even if the liquid crystal display device 14 is placed in high-temp. high-humidity environment. The warpage and distortion of the film substrate 11 and upper and lower polarizing films 12, 13 are thus prevented.

Description

[Detailed description of the invention]

0001

[Field of Industrial Application] The present invention relates to a holding structure for a liquid crystal display device, and more particularly, the present invention relates to a holding structure for a liquid crystal display device, and more specifically, it is possible to hold a liquid crystal display device made of a flexible substrate in a high temperature and high humidity environment without causing warping or the like. This invention relates to a holding structure for a liquid crystal display device.

0002

2. Description of the Related Art Conventionally, there is a holding structure for a liquid crystal display device of this type as shown in FIG. 5, for example. In FIG. 5(a), 1 is a liquid crystal display device, and this device 1 is made of a polymer film or the like, and a liquid crystal is sealed inside.
A transparent insulating film substrate 2 is sealed and has a transparent electrode for driving a liquid crystal on its inner peripheral surface, and a known upper polarizing film 3 and a lower polarizing film 4 are attached to the upper and lower outer peripheral surfaces of this film substrate 2. It is composed of.

This film substrate 2 is composed of a pair of substrates 2a and 2b that are pasted together.The film substrate 2 is held by a holding device in order to form a semiconductor film or a gate insulating film, etc., which will become an active element on the inner surface of the film substrate 2. It is formed through a process of setting the film substrate 2 in a heat treatment furnace and heat-treating it in a heat treatment furnace.For example, in order to prevent warping etc. from occurring when the film substrate 2 is heat-treated, an insertion hole is formed in the outer periphery of the film substrate 2. By inserting a protruding member provided at the top of the holding device into this insertion hole, the holding device is suspended vertically from the top of the holding device to prevent warping due to its own weight. The method is JP-A-1-
248127 and JP-A-2-33122).

A holding member 5 is attached to the upper part of the upper polarizing film 4 as shown in FIG. 5(b), and the upper polarizing film 4 is fixed to this holding member 5 with a double-sided tape 6 interposed therebetween. This holding member 5 is made of an aluminum plate having a thickness of about 0.5 mm, and has a plurality of insertion holes 5a on its outer periphery, into which screws (not shown) or the like are screwed. It is attached to the display panel of a copying machine, etc. Therefore, the liquid crystal display device 1 is held by the holding member 5 and held by a display panel or the like.

[0005] Other liquid crystal display devices are known, such as those described in Japanese Patent Application Laid-Open No. 62-294228. This item is attached to an overhead projector (hereinafter simply referred to as OHP).
A pattern is formed on the back side of one of a pair of flexible substrates that constitutes a liquid crystal display device and in which liquid crystal is enclosed and sealed, in a pattern that gradually becomes coarser and denser from the center toward the periphery. It has a heating resistor.

[0006] In this OHP, light is irradiated from a light source through a condensing Fresnel lens onto the display surface of a liquid crystal display device, and then condensed by the condensing Fresnel lens again and projected onto a screen through an imaging lens. It looks like this. During this projection, the light intensity of the light source is highest at the center of the optical axis, so
The heat received by the flexible substrate gradually decreases toward the periphery.

As described above, this flexible substrate has a heating element having a pattern that gradually becomes denser from sparse as it goes from the center to the periphery, so when the light source is turned on, the heating resistor is heated. By doing so, the temperature at the center is lowered and the temperature at the periphery is raised, thereby providing a uniform temperature distribution over the entire display surface of the liquid crystal display device. Therefore, liquid crystal display can be performed under the same conditions regardless of whether the liquid crystal display device is at the center or at the periphery.

[0008]

However, in the holding structure for a liquid crystal display device shown in FIG. Therefore, it is possible to prevent warping of the film substrate 2 when the film substrate 2 is heat-treated.
After attaching the lower polarizing films 3 and 4, when the lower polarizing films 3 and 4 were held by the holding member 5 to form a unit, the film substrate 2 etc. were warped in a high temperature and high humidity environment.

That is, in a high-temperature, high-humidity environment, the film substrate 2 and the upper and lower polarizing films 3 and 4 have different expansion and contraction rates in the axial direction, and the rigidity of these film substrates 2 and the like is low. Large warpage, distortion, etc. have occurred in 1. Even when the environment is returned to normal temperature and normal humidity, these warping and the like are not eliminated, resulting in a problem in that the display performance and reliability of the liquid crystal display device 1 deteriorate.

[0010] Furthermore, in the liquid crystal display device described in Japanese Patent Application Laid-Open No. 62-294228, since the heating resistor is provided on the back surface of one of the substrates, the heating resistor is By heating the surface of the flexible substrate, the humidity on the surface of the flexible substrate can be lowered relative to the above environment. As a result, the thickness of the flexible substrate increases, which increases the weight of the entire liquid crystal display device, and the manufacturing cost of the liquid crystal display device increases with the increase in weight.

[0011] Therefore, the invention according to claims 1 to 4 can reliably prevent and hold a liquid crystal display device from warping, etc., without increasing weight and cost.
It is an object of the present invention to provide a holding structure for a liquid crystal display device that can improve the display performance and reliability of the liquid crystal display device. In addition, when the liquid crystal display device is installed in a system body such as an OHP where a noticeable temperature rise occurs at the center of the display screen, it is possible to reduce the temperature at the center of the display screen and increase the temperature at the periphery. Another object of the present invention is to provide a holding structure for a liquid crystal display device that can provide a uniform temperature distribution throughout the device and can perform liquid crystal display under the same conditions regardless of the center and peripheral areas of the display surface of the liquid crystal display device. There is.

0012

[Means for solving the problem] The invention according to claim 1 includes:
In order to achieve the above-mentioned problems, we have developed a liquid crystal display device consisting of a rectangular flexible substrate having a display surface that performs a predetermined liquid crystal display, and a mounting part that is attached to the outer periphery of the liquid crystal display device so as to surround the display surface. A holding structure for a liquid crystal display device, comprising: a holding member having a structure, and a liquid crystal display device is held by the holding member, characterized in that a heating resistor is embedded in the mounting portion.

[0013] In order to achieve the above object, the invention according to claim 2 includes a liquid crystal display device comprising a rectangular flexible substrate having a display surface for performing a predetermined liquid crystal display; A holding structure for a liquid crystal display device, comprising: a holding member having a mounting portion attached to an outer peripheral portion of the liquid crystal display device, the holding member holding the liquid crystal display device, the holding structure including a heating resistor on the surface of the mounting portion. The present invention is characterized in that a mounting portion is mounted to the liquid crystal display device via the heating resistor.

In order to achieve the above object, the invention as set forth in claim 3 is characterized in that the heating resistor is made of nichrome wire or kanthal wire. In order to achieve the above object, the invention as set forth in claim 4 is characterized in that the heating resistor is constructed from a tantalum nitride or Ni-Cr thin film resistor.

[0015]

In the invention as set forth in claims 1 and 3, a heating resistor made of nichrome wire or kanthal wire is embedded within the mounting portion of the holding member surrounding the display surface of the liquid crystal display device. Therefore, when the liquid crystal display device is placed in a high-temperature, high-humidity environment, the heating resistor is heated, and the relative humidity with respect to the environment is controlled to be low, and the outer peripheral portion of the liquid crystal display device is supported by the mounting portion. As a result, the liquid crystal display device is stably held by the holding member without warping or the like, and the display performance and reliability of the liquid crystal display device are not deteriorated.

Furthermore, since the heating resistor is provided only in the peripheral portion of the liquid crystal display device, the thickness of the liquid crystal display device does not increase and its weight does not increase, and manufacturing costs do not increase. Furthermore, when a liquid crystal display device is attached to a system body such as an OHP where a noticeable temperature rise occurs in the center of the display screen, the temperature at the center of the display screen becomes low and the temperature at the periphery becomes high. Therefore, the entire display surface has a uniform temperature distribution, and liquid crystal display is performed under the same conditions regardless of the center and peripheral portions of the display surface.

In the second and fourth aspects of the invention, a heating resistor made of a tantalum nitride or Ni-Cr thin film resistor is provided on the surface of the mounting portion of the holding member surrounding the display surface of the liquid crystal display device. Therefore, when the liquid crystal display device is placed in a high-temperature, high-humidity environment, the heating resistor is heated, and the relative humidity with respect to the environment is controlled to be low, and the outer peripheral portion of the liquid crystal display device is supported by the mounting portion. As a result, the liquid crystal display device is stably held by the holding member without warping or the like, and the display performance and reliability of the liquid crystal display device are not deteriorated.

Furthermore, since the heating resistor is provided only in the peripheral portion of the liquid crystal display device, the thickness of the liquid crystal display device does not increase and its weight does not increase, and manufacturing costs do not increase. Furthermore, when a liquid crystal display device is attached to a system body such as an OHP where a noticeable temperature rise occurs in the center of the display screen, the temperature at the center of the display screen becomes low and the temperature at the periphery becomes high. Therefore, the entire display surface has a uniform temperature distribution, and liquid crystal display is performed under the same conditions regardless of the center and peripheral portions of the display surface.

[0019]

EXAMPLES The present invention will be explained below based on examples. FIG. 1 is a diagram showing an embodiment of a holding structure for a liquid crystal display device according to the first and third aspects of the invention. First, the configuration will be explained. In FIG. 1(a), 11 is a rectangular transparent insulating film substrate made of a flexible member such as PET (polyethylene terephthalate).
A pair of substrates 11a, 11 each having a liquid crystal enclosed and sealed therein and having transparent electrodes for driving the liquid crystal provided on the inner peripheral surface.
Although not detailed, it has a display surface for displaying a liquid crystal display on the surface.

A transparent upper polarizing film 12 and a lower polarizing film 13, which constitute a part of the flexible substrate and have a smaller area than the film substrate 11, are fixed to the upper and lower outer peripheral surfaces of this substrate 11. , lower polarizing film 12, 13
is made of an acetate-based resin material, and constitutes the liquid crystal display device 14 together with the film substrate 11 . Further, the upper and lower polarizing films 12 and 13 are attached to the film substrate 11 so as to cover the display surface of the film substrate 11.

The outer peripheral surface of the film substrate 11 is shown in FIG. 1(b).
A mounting portion 15a of the holding member 15 as shown in FIG. The holding member 15 is made of a resin material such as acrylic or polycarbonate, and is attached to a system body such as an OHP (not shown) by inserting bolts or the like into a plurality of insertion holes 15b formed on the outer periphery. Therefore, the liquid crystal display member 14 is held by a holding member 15, and is attached to an OHP or the like via this holding member 15. Further, as shown in FIG. 1(b), a heat generating resistor 17 is embedded in the mounting portion 15a, and this resistor 17
is composed of a known heating resistor such as a nichrome wire or a Kanthal wire, and is attached to the film substrate 1 so as to surround the display surface.
It is arranged on the outer periphery of 1.

In this embodiment having such a configuration, the outer circumferential portion of the film substrate 11 is attached to the attachment portion 15a, and the heating resistor 1 is installed within the attachment portion 15a.
7 is buried, even if the liquid crystal device 14 is placed in a high temperature and high humidity environment, the relative humidity relative to the environment can be controlled to be low by heating the heating resistor 17.
It is possible to prevent warpage, distortion, etc. from occurring in the film substrate 11 and the upper and lower polarizing films 12 and 13. Therefore, the display performance and reliability of the liquid crystal display device 14 can be improved. In addition, since the heating resistor 17 is provided only in the peripheral area of the film substrate 11, it is possible to prevent the entire thickness of the liquid crystal display device 14 from increasing and its weight to increase. It is possible to prevent costs from increasing.

Furthermore, when this liquid crystal display device 14 is attached to a system body such as an OHP, the amount of light received by the display surface of the liquid crystal display device 14 from a light source (not shown) is highest at the center of the optical axis. The heat gradually decreases toward the periphery. In this embodiment, since the outer periphery of the film substrate 11 is heated by the heat generating resistor pair 17, the temperature at the center of the display surface can be lowered and the temperature at the periphery can be increased. With uniform temperature distribution throughout, liquid crystal display can be performed under the same conditions regardless of the center and peripheral areas of the liquid crystal display device 14. In this embodiment, the holding member 14 is made of a resin material such as acrylic or polycarbonate, but is not limited thereto, and may be made of a ceramic material such as alumina ceramics or a glass material.

Further, in this embodiment, the attachment portion 15a is attached to the film substrate 11, but the attachment portion 15a is not limited to this.
As shown in FIG. 2, the outer periphery of the upper polarizing film 21 extends to the outer periphery of the film substrate 11, and the holding member 23 in which the heating resistor 22 is embedded in the outer periphery of the upper polarizing film 21 so as to surround the display surface is attached. 23a may be attached to the portion 23a. Even in this case, the same effects as in the above embodiment can be obtained. In this embodiment, the same components as those in the above embodiment are given the same reference numerals and their explanations will be omitted.

FIG. 3 is a diagram showing an embodiment of the holding structure for a liquid crystal display device according to the invention as claimed in claims 2 and 4. Similar configurations are given the same numbers and descriptions thereof will be omitted. In this embodiment, as shown in FIG. 3, a heating resistor 31 made of a tantalum nitride or Ni-Cr thin film resistor is provided on the surface of the mounting portion 15a of the holding member 15, and this heating resistor 31 is bonded. It is attached to the film substrate 11 by the agent 16. Therefore, the attachment portion 15a is attached to the film substrate 11 via the thermal resistor 31.

Also in this embodiment, the outer peripheral portion of the film substrate 11 is attached to the attachment portion 15a, and
Since the heating resistor 31 is provided on the surface of this mounting portion 15a, even if the liquid crystal device 14 is placed in a high temperature and high humidity environment, the relative humidity with respect to the environment can be controlled to be low by heating the heating resistor 31. Therefore, the same effects as in the embodiment of the invention described in claims 1 and 3 can be obtained.

Further, in this embodiment, the attachment portion 15a is attached to the film substrate 11, but the attachment portion 15a is not limited to this.
As shown in FIG. 3, a holding member 43 is provided with the outer circumference of the upper polarizing film 41 extending to the outer circumference of the film substrate 11, and a heating resistor 42 is provided on the outer circumference of the upper polarizing film 41 so as to surround the display surface. Alternatively, the mounting portion 43a may be attached. Even in this case, the same effects as in the above embodiment can be obtained. In this embodiment, the same components as those in the above embodiment are given the same reference numerals and their explanations will be omitted.

[0028]

According to the invention as claimed in claims 1 and 3, the heating element resistor made of nichrome wire or kanthal wire is embedded in the attachment part of the holding member surrounding the display surface of the liquid crystal display device. When the liquid crystal display device is placed in a high temperature and high humidity environment, the relative humidity of the environment can be controlled to be low by heating the heating resistor, and the outer periphery of the liquid crystal display device is supported by the mounting portion. be able to. Therefore, it is possible to prevent the flexible substrate from warping, etc., and to stably hold it with the holding member.
Display performance and reliability of a liquid crystal display device can be improved.

Furthermore, since the heating resistor is provided only in the peripheral portion of the flexible substrate, it is possible to prevent the thickness of the entire flexible substrate from increasing. Therefore, it is possible to prevent an increase in the weight of the liquid crystal display device and to prevent an increase in its manufacturing cost. Furthermore, when a liquid crystal display device is installed in a system body such as an OHP where a noticeable temperature rise occurs in the center of the device, the temperature in the center can be lowered and the temperature in the periphery can be raised. . Therefore, the entire display surface can have a uniform temperature distribution, and liquid crystal display can be performed under the same conditions regardless of the center and peripheral areas of the liquid crystal display device.

According to the second and fourth aspects of the invention, a heating resistor made of a tantalum nitride or Ni-Cr thin film resistor is provided on the surface of the mounting portion of the holding member surrounding the display surface of the liquid crystal display device. Therefore, when the liquid crystal display device is placed in a high temperature and high humidity environment, the relative humidity of the environment can be controlled to be low by heating the heating resistor, and the outer periphery of the liquid crystal display device can be fixed by the mounting part. can be supported. Therefore, it is possible to prevent the flexible substrate from being warped and to stably hold it with the holding member, thereby improving the display performance and reliability of the liquid crystal display device.

Furthermore, since the heating resistor is provided only in the peripheral portion of the flexible substrate, it is possible to prevent the thickness of the entire flexible substrate from increasing. Therefore, it is possible to prevent an increase in the weight of the liquid crystal display device and to prevent an increase in its manufacturing cost. Furthermore, when a liquid crystal display device is installed in a system body such as an OHP where a noticeable temperature rise occurs in the center of the device, it is possible to lower the temperature in the center and increase the temperature in the periphery. . Therefore, the entire display surface can have a uniform temperature distribution, and liquid crystal display can be performed under the same conditions regardless of the center and peripheral areas of the liquid crystal display device.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing an embodiment of a holding structure for a liquid crystal display device according to the invention as claimed in claims 1 and 3, in which (a) is a partially cross-sectional view of the structure, and (b) is a holding member; FIG.

FIG. 2 is a diagram showing another embodiment of the holding structure for a liquid crystal display device according to the invention as claimed in claims 1 and 3, in which (a) is a partially cross-sectional view of the structure, and (b) is a holding structure for the liquid crystal display device; It is a top view of a member.

FIG. 3 is a diagram showing an embodiment of a holding structure for a liquid crystal display device according to the invention as claimed in claims 2 and 4, in which (a) is a partially cross-sectional view of the structure, and (b) is a holding member; FIG.

FIG. 4 is a diagram showing another embodiment of the holding structure for a liquid crystal display device according to the invention as claimed in claims 2 and 4, in which (a) is a partially cross-sectional view of the structure, and (b) is a holding structure; It is a top view of a member.

FIG. 5 is a diagram showing a conventional holding structure for a liquid crystal display device, in which (a) is a partially cross-sectional view of the configuration thereof, and (b) is a top view of the holding member.

[Explanation of symbols]

11 Transparent insulating film substrate (flexible substrate) 12
, 21, 41 Upper polarizing film (flexible substrate) 1
3 Lower polarizing film (flexible substrate) 14
Liquid crystal display device 15, 23, 43 holding member

Claims (4)

[Claims] 1. A liquid crystal display device comprising a rectangular flexible substrate having a display surface for performing a predetermined liquid crystal display, and a holder having a mounting portion that is attached to the outer periphery of the liquid crystal display device so as to surround the display surface. A holding structure for a liquid crystal display device, comprising: a member, and a holding member for holding a liquid crystal display device, characterized in that a heating resistor is embedded in the mounting portion. . 2. A liquid crystal display device comprising a rectangular flexible substrate having a display surface for performing a predetermined liquid crystal display, and a holder having a mounting portion attached to the outer periphery of the liquid crystal display device so as to surround the display surface. A holding structure for a liquid crystal display device, comprising: a member, and a liquid crystal display device is held by the holding member, wherein a heating resistor is provided on the surface of the mounting portion, and the mounting portion is connected to the mounting portion via the heating resistor. A holding structure for a liquid crystal display device, characterized in that it is attached to the liquid crystal display device. 3. The holding structure for a liquid crystal display device according to claim 1, wherein the heating resistor is made of a nichrome wire or a Kanthal wire. 4. The heating resistor is made of tantalum nitride or N.
3. The holding structure for a liquid crystal display device according to claim 2, wherein the holding structure is made of an i-Cr thin film resistor.