JPH09329777A - Liquid crystal device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve impact resistance performance and to prevent the deterioration in the alignment of liquid crystals in spite of a thin type. SOLUTION: When the impact of a +Y direction is applied on the liquid crystal display device 30, a liquid crystal panel P moves in the same direction and an elastic member 35 and a lower space A4 are compressed. Since the space A4 is in an approximately closed state, the force tending to prohibit the movement of the liquid crystal panel P is generated and similarly, similar force is generated from the elastic member 35 as well. As a result, the movement of the liquid crystal panel P is suppressed. Even when the impact is applied on the device in a -Y direction similarly, the movement of the liquid crystal panel P is suppressed by the elastic member 33 and the upward space A3 . Then, the deterioration in the alignment of the liquid crystals is prevented even in the case the impact is applied on the device. The elastic members 33, 35 are arranged between the liquid crystal panel P and respective caps 31, 32 and, therefore, even if the distances between the liquid crystal panel P and the respective caps 31, 32 are reduced, the interference thereof is averted. Then, the thickness of the liquid crystal display device 30 is reduced.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention generally relates to a liquid crystal device having excellent impact resistance.

[0002]

2. Description of the Related Art Conventionally, liquid crystal devices that display various information by using liquid crystals have been used in various fields, and it is necessary to improve the shock resistance of such liquid crystal devices.

FIG. 1 is a sectional view showing an example of such a liquid crystal display device.

The liquid crystal display device 1 is provided with a cover C arranged so as to cover the liquid crystal panel P, and a fixed support member 2 is attached to the cover C.

The fixed support member 2 is formed in a frame shape, and a panel fixing plate 3 is supported inside the fixed support member 2 via an elastic member 5 in a suspended state.

The panel fixing plate 3 has an opening 3a, and a liquid crystal panel P is arranged on the upper surface of the panel fixing plate 3 so as to close the opening 3a. Note that these liquid crystal panel P and panel fixing plate 3 are
Are adhered by an adhesive 6 applied along the opening 3a of the second member. The liquid crystal panel P is composed of a pair of glass substrates 7 and 8 arranged substantially in parallel, a transparent electrode formed on the substrate surface, and a ferroelectric liquid crystal sandwiched between these substrates. I have. Further, the liquid crystal panel P
A polarizing film (not shown) is affixed to the outer surface of
It also has the function of a polarizing plate.

A circuit board 10 is connected to the liquid crystal panel P via a flexible board 9, and the circuit board 10 is fixed to a rib 3b formed on the upper surface of the panel fixing plate 3.

On the other hand, below the panel fixing plate 3, a backlight device B is attached to the fixed supporting member 2 and arranged. The backlight device B has a light guide 15 through which light is transmitted, and fluorescent lamps 16 and 16 are arranged on the side of the light guide 15. Then, the light emitted from the fluorescent lamps 16 is transmitted through the light guide 15 and is then emitted to the liquid crystal panel P. A panel control plate 17 is arranged on the back side of the backlight device B, and drive signals and the like are transmitted from the panel control plate 17 to the liquid crystal panel P via the cable 19, the circuit board 10 and the flexible board 9. It is being supplied.

[0009] Then, the backlight device B, a panel fixing plate 3, the space A ₁ which is substantially sealed by the liquid crystal panel P is formed.

On the other hand, the cover C has an opening Ca, which is closed by a display plate 20 attached with an adhesive tape or the like. The display plate 20, the cover C, the panel fixing plate 3, and the liquid crystal panel P form a substantially sealed space A ₂ .

When a shock in the + Y direction is applied to the liquid crystal display device 1, the panel fixing plate 3 is supported in a suspended state, so that the panel fixing plate 3 moves in the same direction as shown in FIG. and, the space a ₁ below is compressed. The space A ₁ is due to the state of being substantially sealed, push back the panel fixing plate 3 with the compressed, it exerts a so-called air damper effect. Further, the space A ₂ above exerts air damper effect in the same manner when an impact is applied to the -Y direction. Thereby, the deformation and movement of the liquid crystal panel P are suppressed, and the deterioration of the orientation and the image quality is prevented.

[0012]

However, the above-mentioned liquid crystal display device has the following problems. (1) The space A ₁ formed below the liquid crystal panel P is formed by using the backlight device B. Therefore, the heat from the backlight device B stays in the space A ₁ and the temperature of the liquid crystal panel P rises. As a result, the liquid crystal panel P
There was a problem that the display performance of was deteriorated. (2) Further, in order to enhance the air damper effect by the space A _1, the rigidity of the backlight device B must be increased more than necessary, which causes a problem that the liquid crystal display device 1 becomes heavy. It was (3) Further, in the case of the above-mentioned conventional example, since the opening 3a is formed in the panel fixing plate 3, the rigidity of the fixing plate 3 is not so high. Therefore, when an impact is applied, the fixing plate 3 is deformed into a bow shape as shown in FIG. 2, and this deformation stress is caused by the adhesive 6 through the liquid crystal panel P.
And the liquid crystal panel P is also deformed like a bow. As a result, there is a problem that the orientation of the liquid crystal panel P is deteriorated and the image quality is deteriorated. (4) Furthermore, in the above-described conventional example, when an impact is applied in the direction along the panel fixing plate 3 (the direction orthogonal to the ± Y direction), the elastic member 5 is expanded and contracted to make the panel fixing plate 3 move. Movement in the same direction is suppressed. In order to properly secure such an effect, it is necessary to make the width dimension of the elastic member 5 large. However, since the elastic member 5 is arranged on the side of the panel fixing plate 3, the fixing support member 2 and the case. It is necessary to increase C as well, which is an obstacle to making the device compact. (5) In the liquid crystal display device 1 described above, when an impact is applied in the + Y direction or the −Y direction, the liquid crystal panel P supported in a suspended state does not interfere with other members and moves in the same direction. You must be able to move. For that purpose, it is necessary to increase the distance between the liquid crystal panel P and the display plate 20 and the distance between the liquid crystal panel P and the backlight device B, which causes a problem that the liquid crystal display device 1 becomes thick. (6) On the other hand, in order to prevent reflection on the surface of the display plate 20, it is necessary to subject the surface to a non-glare treatment having a strong haze value, but as described above, the distance between the display plate 20 and the liquid crystal panel P is reduced. There is a problem in that it is difficult to recognize the display contents of the liquid crystal panel P when they are separated. (7) Further, in the above-mentioned conventional example, the substantially enclosed space A ₂
A flexible board 9 and a circuit board 10 are arranged inside the panel, and the panel control plate 17 connected to the flexible board 9 and the circuit board 10 via a cable 19 is located outside the substantially enclosed space A ₂ (back surface of the backlight device B). It is arranged. Therefore,
The cover C which partitions the substantially sealed space A _2, it is necessary to form a through hole 21 for inserting the cable 19, the sealing of the space A ₂ is damaged, a problem that the buffer effect is reduced was there.

[0013]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned circumstances, and includes a first plate member and a second plate member that are arranged at a predetermined distance from each other, and these plate members. A support for positioning, a liquid crystal panel arranged between these plate-shaped members, a first member formed of an elastic material and interposed between the liquid crystal panel and the first plate-shaped member. A second elastic member formed of an elastic material and interposed between the liquid crystal panel and the second plate-shaped member.
A liquid crystal device including: the first elastic member, the liquid crystal panel, and the first plate-shaped member, and a second elastic member. A space substantially sealed by the liquid crystal panel and the second plate-shaped member is formed.

As a result, when the liquid crystal panel is moved toward the first plate-shaped member due to an impact such as a drop, the first elastic member formed between the first plate-shaped member and the liquid crystal panel. Although the members and the substantially closed space are compressed, the reaction force of them reduces the movement of the liquid crystal panel to a minimum. Similarly, when the liquid crystal panel receives an impact and moves to the side of the second plate-shaped member, the second elastic member and the substantially closed space formed between the second plate-shaped member and the liquid crystal panel are closed. Although compressed, their reaction forces minimize movement of the liquid crystal panel. As a result, according to the present invention, it is possible to prevent the deterioration of the orientation and the deterioration of the image quality, suppress the temperature rise and maintain the good display performance, and further, the liquid crystal device becomes lightweight and small.
Furthermore, the visibility of the displayed contents can be improved, and the strength and impact resistance can be excellent.

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION A liquid crystal device according to the present invention includes first and second plate-like members arranged at a predetermined distance, a support for positioning these plate-like members relative to each other, and a support for these members. A liquid crystal panel disposed between the plate-shaped members, a first elastic member formed of an elastic material and interposed between the liquid crystal panel and the first plate-shaped member, and an elastic material And a second elastic member interposed between the liquid crystal panel and the second plate-shaped member.
Forming a space substantially sealed by the elastic member, the liquid crystal panel and the first plate-shaped member, and substantially sealed by the second elastic member, the liquid crystal panel and the second plate-shaped member It is characterized by forming a space.

In this case, it is preferable that the first and second elastic members are arranged in a frame shape so as to surround the display area of the liquid crystal panel. Further, these first and second elastic members may have a rubber hardness of 20 degrees or less.
Note that these first and second elastic members may be formed by using a rubber-based adhesive that exhibits elasticity after being cured, and a molded product formed in advance in a frame shape may be formed with a double-sided tape or an adhesive. It may be formed by sticking, or may be formed by sticking an elastic material punched from a sheet into a frame shape or a rod shape with a double-sided tape or an adhesive.

On the other hand, the support is composed of a first locking portion that is erected from the first plate-shaped member and a second locking portion that is erected from the second plate-shaped member. , The first and second locking portions are engaged with each other, so that the first and second locking portions are engaged.
The plate-shaped member may be positioned. In this case, the first plate-shaped member and the first locking portion may be integrally formed, or they may be formed separately, and those formed separately may be bonded together. Further, the second plate-shaped member and the second locking portion may be integrally formed,
They may be formed separately, and those formed separately may be bonded together. When the first plate-shaped member is formed separately from the first locking portion and is bonded to the first locking portion, the first plate-shaped member is You may make it adhere | attach on the surface which does not oppose the said liquid crystal panel in a 1st engaging part.

Further, the support is formed in a substantially U-shaped cross section, and along the peripheral edges of the first plate-shaped member and the second plate-shaped member so as to sandwich the end portions of the plate-shaped members. It is also possible that the support body positions the plate-shaped members with respect to each other by arranging the plate-shaped members with each other and generating a pressing force between the support body and the plate-shaped member.

In this case, the support is formed of an elastic material, and the plate-shaped member is sandwiched while the support is elastically deformed, so that the support is pressed between the support and the plate-shaped member. You may make it generate | occur | produce a pressure. In that case, it is preferable to dispose a gap defining member for defining a gap between the first plate-shaped member and the second plate-shaped member between the plate-shaped members. Further, it is preferable to arrange the support so that the support holds the vicinity of the portion where the gap defining member is arranged. The gap defining member may be any member as long as it can define the gap between the first plate-shaped member and the second plate-shaped member, but also has a liquid crystal panel positioning function. Is preferable. Further, the number of gap defining members is not particularly limited.

Further, the first and second elastic members are formed so as to protrude in the thickness direction from the gap defining member, and the elastic members are elastically deformed to support the support. By sandwiching the plate-shaped member,
A pressing force may be generated between the support and the plate-shaped member. In this case, since the pressing force between the support and the plate-shaped member is generated by elastically deforming the elastic member, even if the support is made of an elastic material, It may be formed of a material having a high mechanical rigidity.

The first plate-shaped member and the second plate-shaped member may both be rectangular and the supports may be arranged one by one on each side (see reference numeral 63 in FIG. 6). As shown in FIG. 15, two pieces may be arranged on each side, or more pieces may be arranged.

This support may be made of any material such as steel plate, resin, etc., or may be an integral one, or as shown in FIG.
Parts 93 formed separately as shown in 6 (a) and (b)
It may be configured by combining a and 93b with screws 93c or the like (see reference numeral 93).

Since this support needs to sandwich the ends of the first plate-shaped member and the second plate-shaped member, the support must have a substantially U-shaped cross section, but the support shown in FIG. Body 1
As shown in 03, the exterior mounting portion 1 for fixing to other members
03a may be included.

On the other hand, the first and second plate-shaped members may be made of a translucent material. In that case, the first
Both or one of the plate-shaped member and the second plate-shaped member may be formed of a glass plate. Then, as the glass plate, chemically strengthened glass or ordinary glass having a film attached to the surface (glass other than chemically strengthened glass) may be used. Normal glass has a problem in terms of safety because it is more easily broken than chemically strengthened glass. However, sticking a film on the surface prevents scattering of fragments and secures safety. In this case, by using a film that has been subjected to an antiglare treatment, it is possible to simultaneously ensure safety and improve visibility. Further, the second plate member may be a diffusion plate for diffusing light.

Further, the liquid crystal panel is composed of a pair of substrates arranged at a predetermined distance, a plurality of electrodes supported by the substrates, and liquid crystal arranged in the gap between the pair of substrates. May be.

In this case, a ferroelectric liquid crystal, a nematic liquid crystal, or another liquid crystal may be used as the liquid crystal.

[0027]

Embodiments of the present invention will be described below with reference to the drawings. Note that the same parts as those shown in FIG.

First, FIG. 3 shows the first embodiment of the present invention.
And FIG. 4 will be described.

The liquid crystal display device 30 according to this embodiment is provided with two lid-shaped members 31 and 32 (hereinafter, referred to as "upper lid 31" and "lower lid 32").

Of these, the upper lid 31 includes a bottom wall portion (first plate-shaped member; hereinafter referred to as "upper bottom wall portion") 31a formed of a translucent material, and the upper bottom wall. The lower lid 32 is also composed of a vertical wall portion (first locking portion) 31b standing upright from the edge of the portion 31a, and the lower lid 32 is also a bottom wall portion formed of a translucent material ( A second plate-shaped member, hereinafter referred to as "lower bottom wall portion" 32a, and a vertical wall portion (second locking portion) 32b provided upright from the edge of the lower bottom wall portion 32a. It is composed by. And, these lids 31, 32 are
The upper bottom wall portion 31a and the lower bottom wall portion 32a are arranged with a predetermined distance therebetween when they are fitted to each other. That is, in this embodiment, the vertical wall portion 3 described above is used.
1b and the vertical wall portion 32b form a support, and the vertical wall portions 31b and 32b are engaged with each other to position the upper bottom wall portion 31a and the lower bottom wall portion 32a. ing. The upper lid 31 is made of chemically strengthened glass, and the upper bottom wall portion 3 thereof is formed.
The surface of 1a (the upper surface in the figure, which corresponds to the surface on the observer side) is antiglare. The upper bottom wall portion 31a and the vertical wall portion 31b described above are integrally formed to form the upper lid 31, and the lower bottom wall portion 32a and the vertical wall portion 32b are integrally formed. And constitutes the lower lid 32.

A liquid crystal panel P is arranged between the bottom wall portions 31a and 32a. This liquid crystal panel P
Has a pair of substrates 7 and 8 arranged in parallel at a predetermined distance, and a large number of transparent electrodes are formed on the surfaces of the respective substrates 7 and 8. Then, in the gap between the pair of substrates 7 and 8, liquid crystal exhibiting ferroelectricity (hereinafter,
“Ferroelectric liquid crystal”) is arranged. Further, a polarizing film (not shown) is attached to the outer surface of the liquid crystal panel P, which also has the function of a polarizing plate.

Further, the liquid crystal panel P and the upper bottom wall portion 31a
An elastic member (first elastic member) 33 formed of an elastic material is interposed between the liquid crystal panel P and the lower bottom wall portion 32a. (Member) 35 is interposed. The elastic members 33 and 35 are
Liquid crystal panel P is provided with a rubber-based adhesive that exhibits elasticity after curing.
It is formed by applying it on the surface of and hardening it. The rubber hardness of these elastic members 33, 35 in the cured state is set to 20 degrees or less.

Further, these elastic members 33, 35 are
It is formed in a frame shape so as to surround the display area of the liquid crystal panel P, forms a space A ₃ that is substantially sealed by the upper bottom wall portion 31a, the elastic member 33, and the liquid crystal panel P, and the lower bottom wall portion 32a, A space A ₄ that is substantially sealed by the elastic member 35 and the liquid crystal panel P is formed.

Further, a backlight device B is attached to the outer surface of the lower lid 32 so as to illuminate the liquid crystal panel P.

A rib 32c is formed on the inner surface of the lower lid 32.
Is formed, and the circuit board 10 is attached to the rib 32c.

Next, the operation of this embodiment will be described.

When the liquid crystal display device 30 is driven, a drive signal is applied to the liquid crystal panel P via the circuit board 10 and image information is displayed on the liquid crystal panel P. Further, the light emitted from the backlight device B is transmitted through the lower bottom wall portion 32a, the liquid crystal panel P and the upper bottom wall portion 31a, and the image information of the liquid crystal panel P can be recognized.

When a shock is applied to the device 30 in the + Y direction by dropping or the like, the liquid crystal panel P tries to move in the same direction. At this time, the substantially closed space A ₄ below the liquid crystal panel P and the elastic member 35 are compressed, but the reaction force thereof minimizes the movement of the liquid crystal panel P. Similarly, when a shock is applied in the −Y direction, the movement of the liquid crystal panel P is minimized by the substantially sealed space A ₃ above the liquid crystal panel P and the elastic member 33.

Next, the effect of this embodiment will be described.

According to this embodiment, even when a shock is applied, the substantially closed spaces A ₃ , which are arranged above and below the liquid crystal panel P,
The movement and deformation of the liquid crystal panel P can be minimized by A ₄ and the elastic members 33 and 35. Therefore, the liquid crystal panel P
It is possible to prevent the deterioration of the orientation and the deterioration of the image quality.

Further, it is not necessary to form a substantially closed space by the backlight device B as in the conventional case. Therefore,
It is possible to constantly circulate the air around the backlight device B so that heat is not accumulated, and it is possible to suppress the temperature rise of the liquid crystal panel P. As a result, the display performance of the liquid crystal panel P can be favorably maintained.

Further, when a substantially enclosed space is formed by the backlight device B, it is necessary to increase the rigidity of the backlight device B in order to enhance the air damper effect of the space, but in this embodiment, it is necessary to increase the rigidity. There is no need to do so, and the weight of the liquid crystal display device 30 can be reduced.

Furthermore, the upper lid 3 in this embodiment
Since 1 and the lower lid 32 support the liquid crystal panel P, when the lids 31 and 32 are deformed in a bow shape, the liquid crystal panel P is also deformed in a bow shape, and the liquid crystal panel P is aligned. There is a possibility that the image quality will deteriorate or the image quality will deteriorate. However, since these lids 31 and 32 do not have an opening and are highly rigid, they are less likely to be deformed in a bow shape, so that the alignment of the liquid crystal panel P is deteriorated,
The deterioration of image quality can be reduced.

In this embodiment, the liquid crystal panel P
It is only necessary to dispose the flexible board 9 and the circuit board 10 on the side of, and it is not necessary to dispose a member corresponding to the conventional elastic member 5 (see FIG. 1). Therefore, the device can be made compact accordingly. When an impact is applied in the direction along the liquid crystal panel P (direction orthogonal to the ± Y directions), the elastic members 33 and 35 are elastically deformed, and the reaction force thereof causes the liquid crystal panel P to move in the same direction. Movement will be suppressed.

Further, conventionally, the liquid crystal panel P is used in order to avoid interference when a shock is applied in the + Y direction or the −Y direction.
It was necessary to provide a space in which the upper cover 31 can move, but in the present embodiment, the elastic members 33 and 35 are replaced by the upper lid 31.
Since it is arranged between the lid 31 and the lower lid 32, it is possible to avoid interference between the liquid crystal panel P and these lids 31, 32.
Therefore, the elastic members 33 and 35 can be thinned to reduce the thickness of the liquid crystal display device as compared with the conventional one, and the size of the device can be reduced. Further, even if the surface of the upper lid 31 is subjected to the non-glare treatment as in the present embodiment, the upper lid 31 is
Since the distance between the liquid crystal panel P and the liquid crystal panel P can be reduced, parallax is reduced, blurring is suppressed, and the visibility of the display content is improved.

Furthermore, according to this embodiment, the elastic members 33 and 35 are arranged so as to surround the display area of the liquid crystal panel P, so that the circuit board 10 is substantially enclosed space A ₃ , A ₃ .
Can be placed outside of ₄ . As a result, the through holes 21 (see FIG. 1) for inserting the cables 19 are formed in the spaces A ₃ , A ₄
Since it is not necessary to provide a member for partitioning the space, the airtightness of the spaces A ₃ and A ₄ is improved and the cushioning effect is improved.

Next, a second embodiment of the present invention will be described with reference to FIG.

Liquid crystal display device (liquid crystal device) according to the present embodiment
The reference numeral 50 includes two lid-shaped members 51 and 52 (hereinafter, referred to as "upper lid 51" and "lower lid 52").

Of these, the upper lid 51 has an opening 51c.
Has an upper bottom wall portion 51a formed therein, and the opening 51c is closed on the upper surface of the upper bottom wall portion 51a (the surface on the observer side, which does not face the liquid crystal panel P). A display plate (first plate-shaped member) 53 made of chemically strengthened glass is attached so as to do so. In addition, this display board 53
Is fixed by a double-sided adhesive tape or the like, and the surface of the display plate 53 (the surface on the observer side) is antiglare. Further, the upper bottom wall portion 51a
A vertical wall portion (first locking portion) 51b is erected from the edge of the. That is, in this embodiment, the display plate 53 and the vertical wall portion 51b are formed of different materials as separate members, and the upper lid member 51 is configured by bonding them.

On the other hand, the lower lid 52 has a lower bottom wall 52a having an opening 52c formed therein, and the lower bottom wall 52a is diffused so as to close the opening 52c. A plate (second plate-shaped member) 55 is attached. In addition,
The diffusion plate 55 is fixed by a double-sided adhesive tape or the like. Further, a vertical wall portion (second locking portion) 52b is erected from the edge of the lower bottom wall portion 52a.
That is, in this embodiment, the display plate 53 and the vertical wall portion 51b.
The upper lid 51 is formed of a different material from the above, and is adhered to form the upper lid 51.

The lids 51 and 52 are constructed so that they can be inserted into and removed from each other, and in the fitted state, the display plate 53 and the diffusion plate 55 are arranged with a predetermined distance therebetween. It is like this. That is, in the present embodiment, the vertical wall portion 51b and the vertical wall portion 52b described above constitute a support, and the vertical wall portion 51b,
The upper bottom wall portion 51a and the lower bottom wall portion 52a are positioned by engaging the 52b.

A liquid crystal panel P is arranged between the display plate 53 and the diffusion plate 55, and the liquid crystal panel P
And the display plate 53 between the elastic member (first elastic member) 3
3, an elastic member (second elastic member) 35 is interposed between the liquid crystal panel P and the diffusion plate 55. The rubber hardness of these elastic members 33, 35 is set to 20 degrees or less.

Furthermore, these elastic members 33, 35 are
It is formed in a frame shape so as to surround the display area of the liquid crystal panel P, forms a space A ₃ that is substantially sealed by the display plate 53, the elastic member 33 and the liquid crystal panel P, and forms the diffusion plate 55, the elastic member 35 and the liquid crystal. Space A substantially sealed by panel P
It is supposed to form ₄ .

Further, a backlight device B is attached to the outer surface of the lower lid 52 so as to illuminate the liquid crystal panel P.

A rib 52d is provided on the upper surface of the lower lid 52.
Is formed, and the circuit board 10 is attached to the rib 52d.

Next, the effect of this embodiment will be described.

In this embodiment, since the lids 51 and 52 are formed by combining different members, the bottom wall 51
The rigidity of the lids 51 and 52 can be increased by using sheet metal members for the a and 52a and the vertical wall portions 51b and 52b. As a result, the air damper effect of the substantially closed spaces A ₃ and A ₄ can be enhanced, and the impact resistance performance of the liquid crystal display device 50 can be enhanced. Further, since the respective lids 51 and 52 are configured by combining different members,
The degree of freedom in design is expanded and the cost of the device is reduced.

Further, since the display plate 53 is attached to the upper surface (the surface on the observer side) of the upper bottom wall portion 51a, the display plate 53 does not come off even when pressed by the observer side. In that respect, the strength of the liquid crystal display device 50 is improved.

Furthermore, according to this embodiment, the same effect as that of the above-mentioned embodiment can be obtained.

Next, a third embodiment of the present invention will be described with reference to FIGS.

Liquid crystal display device (liquid crystal device) according to this embodiment
As shown in FIGS. 6 (a) and 6 (b), 60 is a rectangular display plate (first plate-shaped member) 6 arranged with a predetermined distance.
1 and a diffusion plate (second plate member) 62, and the liquid crystal panel P is provided between the display plate 61 and the diffusion plate 62.
Is arranged. The ribs 6 are provided on the upper surface of the diffusion plate 62.
2a is formed, and the circuit board 1 is formed on the rib 62a.
0 is attached. An elastic member (first elastic member) 33 is interposed between the liquid crystal panel P and the display plate 61, and an elastic member (second elastic member) is provided between the liquid crystal panel P and the diffusion plate 62. (Member) 35 is interposed. Further, a pin (gap defining member) 65 and a pressing member (gap defining member) 66 are attached to the upper surface of the diffusion plate 62, and the liquid crystal panel P has the pin 65 and the pressing member 66.
It is fixed to the diffusion plate 62 by and. In addition,
A clip-shaped support member (support body) 63 is disposed on each side so as to extend along the peripheral edges of the display plate 61 and the diffusion plate 62. Is positioned. Further, a backlight device (not shown) is arranged below the diffusion plate 62, and the light emitted from the backlight device is diffused by the diffusion plate 62, and then the liquid crystal panel P has a uniform brightness. It is designed to illuminate.

The details of each component such as the above-described liquid crystal panel P will be described below.

The liquid crystal panel P is composed of a pair of translucent substrates 7 and 8 arranged substantially in parallel, transparent electrodes formed on the surfaces of the substrates, and a ferroelectric liquid crystal sandwiched between these substrates. Has been done. Further, a polarizing film (not shown) is attached to the outer surface of the liquid crystal panel P, which also has the function of a polarizing plate.

The display plate 61 and the diffusion plate 62 are both members having a light-transmitting property, and are made of a material having the same coefficient of thermal expansion as that of the light-transmitting substrates 7 and 8. For example,
When the translucent substrates 7 and 8 are glass substrates, the display plate 61 and the diffusion plate 62 are also glass plates. Then, the diffusion plate 62 is configured to diffuse the light emitted from the backlight device, as described above.

The elastic members 33 and 35 are formed in a frame shape so as to surround the display area of the liquid crystal panel P, and the display plate 6 is provided.
1, a space A ₃ substantially sealed by the elastic member 33 and the liquid crystal panel P is formed, and a space A ₄ substantially sealed by the diffusion plate 62, the elastic member 35 and the liquid crystal panel P is formed.

As shown in FIG. 7, the pins 65 are fixed one by one so as to come into contact with the two end faces of the liquid crystal panel P (the left end face and the lower end face in the figure), and the pressing member 66.
Is L-shaped and is fixed so as to abut on the upper right corner and the lower right corner of the liquid crystal panel P. Then, by the pins 65 and the pressing member 66, the ± of the liquid crystal panel P is
Positioning in the X and Z directions is being performed.

When assembling the liquid crystal panel P,
Only the pin 65 is attached to the diffusion plate 62, and the pressing member 66 is removed. Then, the liquid crystal panel P is placed at the position defined by these pins 65, and then the pressing member 66 is attached to the diffusion plate 62.

On the other hand, these pins 65 and the pressing member 66
Is a height equivalent to the sum of the thickness of the elastic members 33 and 35 and the thickness of the liquid crystal panel P, and is arranged between the display plate 61 and the diffusion plate 62 to define the gap between them. It is also becoming.

The support member 63 is made of an elastic material (for example, 0.
A thin steel plate of about 2 to 0.6 mm) is formed in a substantially U-shaped cross section, and as shown in detail in FIG. 8 (a), projections 63a and 63b are formed at the ends so as to face each other. Has been done. These protrusions 63a and 63b are provided on the support member 6
3 is formed over the entire length of the protrusion 3 and these protrusions 63
The distance d between the a and 63b (the distance d in FIG. 8 (a), which is the distance in the free state before the support member 63 is assembled) is determined by the thickness of the pin 65 or the pressing member 66. It is set to be smaller than the total thickness of 61 and the diffusion plate 62. Therefore, FIG.
As shown in detail in (c), when the support member 63 sandwiches the end portions of the display plate 61 and the diffusion plate 62, the separation distance d increases and the support member 63 is elastically deformed.
And the display plate 61, and between the support member 63 and the diffusion plate 62.
A pressing force "a" is generated between them and the display plate 61 and the diffusion plate 62 are positioned relative to each other.

The total length of the support member 63 is set to be shorter than the length of each side of the liquid crystal panel P,
The protrusions 63a and 63b of the support member 63 are configured to sandwich the portion where the pin 65 and the pressing member 66 are arranged. In addition, FIG. 8B shows that when the support member 63 is attached, the support member 63 is elastically deformed and the protrusion 63
It shows a state in which the distance between a and 63b is increased.

Next, the effect of this embodiment will be described.

Now, when a component such as the cover C described in the conventional example is used and the component is made of a steel plate, an area larger than that of the liquid crystal panel P is required to form one liquid crystal display device. Steel plate material is required. On the other hand, the support member 63 in this embodiment can be a smaller component than the cover C of the conventional example, and in that case, the material cost can be reduced.

Further, the cover C described in the conventional example has an opening, but the material of this opening has to be punched out by a press machine and discarded, so that the use efficiency of the material is lowered. On the other hand, since the support member 63 in this embodiment has no opening, it is possible to prevent waste of material.

Further, in order to manufacture a part such as the cover C described in the conventional example from a steel plate, a press machine and a press die for punching an opening and bending an end are required. Since the outer diameter of the cover C is larger than that of the liquid crystal panel P, it is necessary to use a large press machine or press die. On the other hand, the support member 63 in the present embodiment is a smaller component than the cover C of the conventional example, so that the press machine and the press die used can also be small in size.
The processing cost can be reduced.

By the way, recent liquid crystal display devices have 20 to 20
Since a large screen of 30-inch class is becoming mainstream, when a component such as the cover C described in the conventional example is used, the component (cover C) is replaced with an increase in size of the liquid crystal panel P. Inevitably, the problems described above (increased material costs and increased size of presses and press dies) become more significant. However, in the present embodiment, even if the liquid crystal panel P becomes large, the supporting member 63 may remain small, and the above effect is maintained.

On the other hand, as the display screen becomes larger, the proportion of the openings in the cover C increases. this is,
The larger the screen is, the larger the opening of the cover C is, but the area other than the opening is defined by the sizes of the flexible substrate 9 and the circuit board 10, and is constant regardless of the screen size. is there. FIG. 9 is a diagram showing the relationship between the size of the screen and the ratio occupied by the openings (the screen aspect ratio is 3: 4 and the width of the frame is 40 mm), but the ratio occupied by the openings is 15 About 59 in inches
20% is about 66%, 25 inches is about 71%, and 30 inches is about 75%. In this way, as the display screen becomes larger, the proportion of the openings in the cover C increases, so that the larger the display screen, the lower the material use efficiency. However, in this embodiment, since the supporting member 63 has no opening, the use efficiency of the material does not decrease even if the liquid crystal panel P becomes large.

On the other hand, when a component such as the cover C described in the conventional example is used, the component (cover C) must be increased in size as the liquid crystal panel P is increased in size.
In the case of this embodiment, it is not necessary to change the size of the supporting member 63 even if the liquid crystal panel P becomes large. In other words,
The supporting member 63 having the same size can be used regardless of the size of the liquid crystal panel P or the like, and when manufacturing liquid crystal display devices of various sizes, the supporting member 63 can be made common, and the cost can be reduced accordingly. Can be achieved.

On the other hand, as shown in FIG. 10 (a), the protrusions 63a and 63b of the support member 63 are located outside the pin 65 (or the pressing member 66) (on the end side of the display plate 61 and the diffusion plate 62). When is pressed, the display plate 61 and the diffusion plate 62 are deformed as shown by the action of a moment around the support point of the pin 65 and the pressing member 66. Further, as shown in FIG. 10B, the protrusions 63a and 63b of the support member 63 press the inside of the pin 65 (or the pressing member 66) (the central portion side of the display plate 61 and the diffusion plate 62). In this case, the display plate 61 and the diffusing plate 62 are deformed as shown by the action of a moment about the support point of the pin 65 and the pressing member 66. Even if the display plate 61 and the diffusion plate 62 are deformed as described above, the support member 63 and the display plate 61 are
(Or, the contact between the support member 63 and the diffusion plate 62 becomes unstable, and the support member 63 may fall off.

However, in this embodiment, the protrusions 63a and 63b of the support member 63 are configured to press the portions corresponding to the pin 65 and the pressing member 66 (FIG. 8).
(See (c)), the display plate 61 and the diffusion plate 62 are not deformed, and the possibility of the supporting member 63 coming off can be eliminated.

Further, according to this embodiment, the diffusion plate 62 is
The liquid crystal panel P (to be precise, the transparent substrates 7 and 8) is formed of a material having the same thermal expansion coefficient. Therefore, fixing of the liquid crystal panel P is not insufficient, and thermal stress does not occur in the liquid crystal panel P. That is, the diffusion plate 62
If the coefficient of thermal expansion of the liquid crystal panel P is made larger than that of the liquid crystal panel P, even if the state shown in FIG. ), The diffusion plate 62 extends more than the liquid crystal panel P, and a gap δ ₁ is generated between the liquid crystal panel P and the pin 65 (or the pressing member 66), and ± X of the liquid crystal panel P, Fixing in the Z direction becomes insufficient. On the contrary, when the thermal expansion coefficient of the diffusion plate 62 is made smaller than that of the liquid crystal panel P, when the environmental temperature rises,
As shown in (c), the liquid crystal panel P tries to thermally expand in the ± X and Z directions, but since the expansion is hindered by the pin 65 and the pressing member 66, thermal stress is generated in the liquid crystal panel P. . However, in the present embodiment, the diffusion plate 62
Since the coefficient of thermal expansion is equal to the coefficient of thermal expansion of the liquid crystal panel P, there is no such problem.

Further, according to this embodiment, the same effect as that of the above-described first embodiment can be obtained.

Next, a fourth embodiment of the present invention will be described with reference to FIGS.

FIG. 11 shows a liquid crystal display device 7 according to this embodiment.
FIG. 2 is a diagram showing the overall configuration of a 0. This liquid crystal display device 70
Has substantially the same configuration as the liquid crystal display device 60 according to the third embodiment, except that the height dimension relationship between the elastic members 33 and 35 and the pin 65 (or the pressing member 66) and the supporting member (supporting member). ) 73 is different in shape and attachment point from the third embodiment.

Specifically, the height dimension of the pin 65 and the pressing member 66 is more than the sum of the thicknesses of the elastic members 33 and 35 (thickness in a free state where no external force acts) and the thickness of the liquid crystal panel P. It is set to be small (Fig. 1
Refer to the symbol δ ₂ of 3 (a)). In other words, in the free state where no external force is applied, the elastic members 33 and 35 project more than the pin 65 and the pressing member 66.

Further, the supporting member 73 is formed of a steel plate which is an elastic material and has a substantially U-shaped cross section, but the thickness thereof is relatively large at about 0.8 to 1.2 mm. Further, as shown in detail in FIG. 12, protrusions 73a and 73b are formed at the end of the support member 73 so as to face each other (and over the entire length of the support member 73).
The distance d between the protrusions 73a and 73b (distance in a free state where no external force acts) is equal to the sum of the thickness of the pin 65 or the pressing member 66 and the thickness of the display plate 61 and the diffusion plate 62. It is set.

FIG. 13 is a view showing a process of assembling the support member 73. When the support member 73 is assembled, the display plate 61 and the diffusion plate 62 are pressed to press the elastic member 3 together.
3 and 35 are compressed in the Y direction (see FIG. 2B), and the display plate 6
The lower surface of 1 is brought into contact with the upper surfaces of the pin 65 and the pressing member 66. With the elastic members 33 and 35 thus elastically deformed, the support member 73 is assembled as shown in FIG. 7C, and the display member 61 and the diffusion plate 62 are held by the support member 73. As a result, when the support member 73 sandwiches the end portions of the display plate 61 and the diffusion plate 62, the elastic members 33, 3 are provided.
The pressing force b associated with the restoring force of No. 5 is generated between the support member 73 and the display plate 61 and between the support member 73 and the diffusion plate 62, so that the display plate 61 and the diffusion plate 62 are positioned relative to each other. It is supposed to be done.

In this embodiment, the support member 73
The protrusions 73a and 73b sandwich the portions where the elastic members 33 and 35 are arranged as shown in FIG. 13 (c).

Next, the effect of this embodiment will be described.

Now, as shown in FIG. 14, the support member 73
When the protrusions 73a and 73b of the elastic members 33 and 35 are pressed to the outside (the end sides of the display plate 61 and the diffusion plate 62) of the elastic members 33 and 35, the restoring force b of the elastic members 33 and 35 is changed to the display plate 61 and By acting as a moment on the diffusion plate 62, the display plate 61 and the diffusion plate 62 are deformed as illustrated. When the display plate 61 and the diffusion plate 62 are thus deformed, the contact between the support member 73 and the display plate 61 (or the support member 73 and the diffusion plate 62) becomes unstable, and the support member 73 falls off. There is a risk of In addition,
The elastic members 33 are attached to the protrusions 73a and 73b of the support member 73,
When the inner side of 35 (the central portion side of the display plate 61 and the diffusion plate 62) is pressed, the display plate 61 and the diffusion plate 62 are deformed, or the support member 73 narrows the display area of the liquid crystal panel P. To do.

However, according to this embodiment, the support member 73
The projections 73a and 73b of the display plate 61 sandwich the portions where the elastic members 33 and 35 are arranged.
The deformation of the diffusion plate 62 can be avoided to prevent the supporting member 73 from falling off, and the display area of the liquid crystal panel P is not narrowed.

Further, according to the fourth embodiment, the same effect as that of the third embodiment can be obtained.

[0092]

As described above, according to the present invention,
Even when a shock is applied, the movement of the liquid crystal panel is minimized by the substantially sealed space and the elastic member adjacent to the liquid crystal panel. Therefore, it becomes possible to prevent the deterioration of the orientation of the liquid crystal panel and the deterioration of the image quality.

Further, according to the present invention, since these substantially enclosed spaces are formed by plate members or the like and are not formed by the backlight device as in the conventional case, the air around the backlight device is prevented. It becomes possible to circulate constantly.
As a result, heat can be prevented from staying in the liquid crystal device, the temperature rise of the liquid crystal panel can be suppressed, and the display performance of the liquid crystal panel can be favorably maintained.

Further, since the substantially enclosed space is not formed by the backlight device, it is not necessary to increase the rigidity of the backlight device in order to enhance the air damper effect of the space. As a result, the weight of the liquid crystal device can be reduced.

Furthermore, when the first and second plate-shaped members are made of a translucent material, it is not necessary to provide openings in these members. Therefore, the rigidity of these members becomes high, and they are prevented from deforming in a bow even when an impact is applied. As a result, the liquid crystal panel is not deformed in a bow shape, and the deterioration of the orientation of the liquid crystal panel and the deterioration of the image quality are prevented.

Further, by disposing the first and second elastic members as in the present invention, the movement in the direction along the surface of the liquid crystal panel is also suppressed. Therefore, in order to suppress the movement, it is not necessary to dispose another elastic member on the side of the liquid crystal panel, and the device can be made compact accordingly.

Further, since an elastic member is interposed between the liquid crystal panel and the first plate-shaped member and between the liquid crystal panel and the second plate-shaped member, impact or the like is applied. However, the interference between the liquid crystal panel and these plate-shaped members can be avoided. For this reason, these elastic members can be made thinner, and the thickness of the liquid crystal display device can be made smaller than that of the conventional one, so that the device can be downsized. Furthermore, since the distance between the liquid crystal panel and the plate-shaped member can be reduced, parallax is reduced and blurring is suppressed even if the surface of the plate-shaped member is subjected to non-glare treatment.
The visibility of the display content is improved.

The above effect is obtained by using the support
It is constituted by a first locking portion that is erected from the first plate-shaped member and a second locking portion that is erected from the second plate-shaped member, and these first and second It can also be achieved by engaging the locking portion of. Here, the first plate-shaped member and the first locking portion may be configured integrally or separately. Further, the second plate-shaped member and the second locking portion may be integrally configured,
You may comprise by another body.

On the other hand, the support is formed in a substantially U-shaped cross section, and is arranged along the peripheral edges of the first plate-shaped member and the second plate-shaped member to sandwich these plate-shaped members. Even in this case, the same effect as described above can be obtained. In such a case, the following effects can be further obtained.

That is, it is not necessary to make the support the same size as the liquid crystal panel, and the material cost can be reduced when the support is made small. In addition, it is not necessary to form an opening in the support, and it is possible to prevent waste of material. Further, since the support can be miniaturized as described above, even when the support is formed by pressing a steel plate, the press machine or the press die used can be small, and the processing cost can be reduced. Furthermore, even if the liquid crystal panel becomes large, the support may remain small, and the above effect is maintained. Further, when manufacturing liquid crystal devices of various sizes, the same size of support can be used, and the cost can be reduced accordingly.

On the other hand, in the case where the support is formed of the first locking portion and the first locking portion is formed separately from the first plate-shaped member, the liquid crystal panel is When the first plate-shaped member is adhered to the surface of the first locking portion on the side not facing each other, the first plate-shaped member does not come off even if pressed, The strength of the liquid crystal device is improved.

Further, when the first and second elastic members are arranged so as to surround the display area of the liquid crystal panel, a cable or the like for transmitting a drive signal to the liquid crystal panel is arranged outside the substantially closed space. Therefore, it is not necessary to provide a through hole for inserting the cable in the space. As a result, the airtightness of the space is improved and the cushioning effect is improved.

[Brief description of drawings]

FIG. 1 is a sectional view showing an example of a conventional liquid crystal display device.

FIG. 2 is a diagram for explaining a conventional problem.

FIG. 3 is a sectional view for explaining the structure of the liquid crystal display device according to the first embodiment of the present invention.

FIG. 4 is a sectional view for explaining the operation of the first embodiment of the present invention.

FIG. 5 is a sectional view for explaining the structure of a liquid crystal display device according to a second embodiment of the present invention.

6A and 6B are views for explaining the structure of a liquid crystal display device according to a third embodiment of the present invention, in which FIG. 6A is a perspective view and FIG.
AA sectional drawing of.

FIG. 7 is a view for explaining the arrangement of pins and pressing members.

8A is a diagram showing the shape of a support member in a free state, FIG. 8B is a diagram showing the shape of a support member elastically deformed at the time of attachment, and FIG. 8C is a detail showing the state of the support member attached. Sectional view.

FIG. 9 is a diagram showing the relationship between the size of the screen and the ratio occupied by the openings.

10A and 10B are views for explaining the effect of the third embodiment, in which FIG. 10A shows the protrusions 63a and 63b of the support member 63 on the outside of the pin 65 (or the pressing member 66) (display plate 6).
1 and a view showing a state in which the end side of the diffusion plate 62 is pressed, (b) is a projection 63a, 63b of the support member 63.
Inside the pin 65 (or the pressing member 66) (display plate 6
1 is a diagram showing a state in which a central portion of the diffusion plate 62 and the diffusion plate 62 are pressed.

11A and 11B are views for explaining the structure of a liquid crystal display device according to a fourth embodiment of the present invention, in which FIG. 11A is a perspective view and FIG.
(a) BB sectional drawing.

FIG. 12 is a view showing the shape of a support member in a free state.

FIG. 13 is a diagram showing a step of assembling the support member,
(a) is a diagram showing the state before mounting the support member, (b)
FIG. 6A is a view showing a state where the display plate and the diffusion plate are pressed when the support member is assembled, and FIG. 7C is a view showing a state where the support member is assembled.

FIG. 14 is a diagram for explaining the effect of the fourth embodiment, in which the elastic members 33, 35 are provided on the protrusion 73a of the support member 73.
The figure which shows the state which pressed the outer side (end part side in the display board 61 and the diffusion plate 62) rather than.

FIG. 15 is a view showing a state in which two support members are arranged on each side of the diffusion plate.

16A and 16B are views of an assembly type support member, FIG. 16A is a part view thereof, and FIG. 16B is a view showing a state in which the support member is assembled.

FIG. 17 is a view showing a modified example of the support member.

FIG. 18 is a diagram for explaining the effect of the third embodiment.

[Explanation of symbols]

30 Liquid Crystal Display Device (Liquid Crystal Device) 31 Upper Lid 31a Upper Bottom Wall (First Plate Member) 31b Vertical Wall (First Locking Part) 32 Lower Lid 32a Lower Bottom Wall (first 2 plate-shaped member) 32b vertical wall portion (second locking portion) 33 elastic member (first elastic member) 35 elastic member (second elastic member) 50 liquid crystal display device (liquid crystal device) 51 upper lid 51b Vertical wall portion (first locking portion) 52 Lower lid 52b Vertical wall portion (second locking portion) 53 Display plate (first plate member) 55 Diffusion plate (second plate member) ) 60 liquid crystal display device (liquid crystal device) 61 display plate (first plate-shaped member) 62 diffusion plate (second plate-shaped member) 63 support member (support) 73 support member (support) 93 support member (support) Body) 103 support member (support) A ₃ substantially sealed space A ₄ substantially sealed space B backlight device P LCD panel

Claims (20)

[Claims] 1. A first plate member and a second plate member, which are arranged at a predetermined distance from each other, a support for positioning these plate members relative to each other, and a liquid crystal arranged between these plate members. A panel, a first elastic member formed of an elastic material and interposed between the liquid crystal panel and the first plate-like member, and an elastic material formed of the liquid crystal panel and the liquid crystal panel A second elastic member interposed between the first elastic member, the liquid crystal panel and the first plate-shaped member, and a second elastic member interposed between the second plate-shaped member and the second plate-shaped member. And forming a space that is substantially sealed by the second elastic member, the liquid crystal panel, and the second plate-shaped member. 2. The liquid crystal device according to claim 1, wherein the first and second elastic members are arranged in a frame shape so as to surround a display region of the liquid crystal panel. 3. The support includes a first locking portion that is erected from the first plate-shaped member and a second locking portion that is erected from the second plate-shaped member. By engaging these first and second locking portions,
The liquid crystal device according to claim 1 or 2, wherein the first and second plate-shaped members are positioned. 4. The liquid crystal device according to claim 3, wherein the first plate-shaped member and the first locking portion are integrally formed. 5. The first plate-shaped member and the first locking portion are formed as separate members, and the first plate-shaped member is bonded to the first locking portion. The liquid crystal device according to claim 3. 6. The liquid crystal device according to claim 5, wherein the first plate-shaped member is bonded to a surface of the first locking portion that does not face the liquid crystal panel. 7. The liquid crystal device according to claim 4, wherein the second plate-shaped member and the second locking portion are integrally formed. 8. The second plate-shaped member and the second locking portion are formed as separate bodies, and the second plate-shaped member is bonded to the second locking portion. The liquid crystal device according to any one of claims 4 to 6. 9. The support is formed in a substantially U-shaped cross section, and is provided on the peripheral edges of the first plate-shaped member and the second plate-shaped member so as to sandwich the ends thereof. It arrange | positions along and the said support body positions the said plate-shaped members mutually by generating a pressing force between the said support body and the said plate-shaped member. 2. The liquid crystal device according to item 2. 10. The pressing force is applied between the support and the plate-shaped member by forming the support with an elastic material and sandwiching the plate-shaped member in a state where the support is elastically deformed. The liquid crystal device according to claim 9, wherein: 11. A gap defining member for defining a gap between the first plate-shaped member and the second plate-shaped member is arranged between the first plate-shaped member and the second plate-shaped member. Item 10. The liquid crystal device according to item 10. 12. The liquid crystal device according to claim 11, wherein the support is arranged such that the support holds the vicinity of a portion where the gap defining member is arranged. 13. The support body is formed such that the first and second elastic members project in the thickness direction from the gap defining member, and the elastic members are elastically deformed. The liquid crystal device according to claim 9, wherein a pressing force is generated between the support and the plate member by sandwiching the plate member with the plate member. 14. The liquid crystal device according to claim 1, wherein the first and second plate-shaped members are formed of a translucent material. 15. The liquid crystal device according to claim 14, wherein the first plate-shaped member is a glass plate. 16. The liquid crystal device according to claim 14, wherein the second plate-shaped member is a glass plate. 17. The liquid crystal device according to claim 16, wherein the second plate-shaped member is a diffusion plate for diffusing light. 18. The first and second elastic members are 20
18. The liquid crystal device according to claim 1, wherein the liquid crystal device has a rubber hardness of not more than 40 degrees. 19. The liquid crystal panel includes a pair of substrates arranged at a predetermined distance, a plurality of electrodes supported by the substrates, and liquid crystal arranged in a gap between the pair of substrates. 19. The liquid crystal device according to claim 1, wherein the liquid crystal device is a liquid crystal device. 20. The liquid crystal device according to claim 19, wherein the liquid crystal is a liquid crystal exhibiting ferroelectricity.