JP2001195006A - Panel, panel built-in structure, optical unit, display device and fixing method - Google Patents

Abstract

(57) [Problem] To provide a liquid crystal projector with a repairable fixing structure of a light valve means and to prevent a position movement after fixing. SOLUTION: A metal brazing portion 207 is provided on a part of a support plate of a light valve panel 2 and is fixed by soldering to a holder holding a prism portion. In this manner, the fixed light valve panel 2
Can be prevented from moving relative to the base 201, and the displacement of the image to be projected can be prevented. Further, by removing the soldering, the light valve panel 2 can be removed, thereby improving maintainability. Further, the material constituting the light valve panel and the linear expansion coefficient ratio of the base portion supporting the light valve panel are set to a value between 1 and 3, and by a temperature cycle,
The displacement of the projected image is prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a panel, a panel built-in structure, an optical unit, and a display device. More particularly, the present invention relates to a light valve element such as a liquid crystal panel and an image projected on a screen using these elements. For example, the present invention relates to a technique suitable for application to a video display device such as a liquid crystal projector device, a liquid crystal television, and a projection display device.

[0002]

2. Description of the Related Art Conventionally, light from a light source such as a light bulb has been used.
2. Description of the Related Art A projection type display device such as a liquid crystal projector is known, in which a light valve element such as a liquid crystal panel is used to change and adjust the density of each pixel to project an image on a screen or the like.

[0003] Also, as a certain type of projection type display device, there is known a device which uses a plurality of light valve elements to display images of different color tones in color. In a display device that performs color display using the plurality of light valve elements, color display is generally performed as follows.

First, light from a light source is split into a plurality of wavelength bands for separation. Then, each color band is input to a corresponding light valve element to perform modulation, and finally, the modulated color components are combined and displayed as a color image.
In order to combine images of a plurality of tones and project them as a video, if the positions of the images for each color component are not accurately adjusted, a color shift occurs in the synthesized video. For this reason, various methods have been proposed as methods for adjusting and fixing the mounting position of the light valve element in charge of each color component.

Conventional adjustment methods of this kind include, for example, Japanese Patent Application Laid-Open No. 10-10994 and International Publication W.
No. 098/27453 is known. In this type of adjustment method, a liquid crystal panel as a light valve element is bonded to an intermediate plate called a frame plate after adjustment. Further, this frame plate is screwed to a fixed frame to which prism means for synthesizing each color component is adhered. Also,
If it becomes necessary to maintain or replace the LCD panel after adjustment, the screws can be removed to allow easy maintenance of the LCD panel or prism and replacement of the target LCD panel or prism. In addition, expensive liquid crystal panels and prisms are not wasted. further,
In this method, the image position of each color component can be accurately adjusted. In addition, by controlling the linear expansion coefficients of the prism member, the fixed frame, and the frame plate to be within a certain range, a deviation due to a temperature change of each member is prevented. However, after the adjustment, the image position changes due to the movement between the screwed frame plate and the fixed plate due to temperature change or vibration, and also between the glass part and the mold part inside the liquid crystal panel However, it cannot be said that the problem that the color deviation of the finally projected image may occur is sufficiently solved.

Another adjustment and fixing method is disclosed, for example, in Japanese Patent Application No. 11-84196.
In this adjustment method, since the liquid crystal panel is fixed to the prism means as the synthesizing means via the holder plate as the mounting plate for the adjusted liquid crystal panel, the image position of each color component can be accurately adjusted. However, if maintenance is necessary due to failure of the liquid crystal panel after bonding, the liquid crystal panel is directly bonded to the prism,
The fact that expensive liquid crystal panels and prisms are discarded is not sufficiently solved. In addition, sufficient consideration has been given to the point that the image position may change due to the movement between the holder plate and the liquid crystal panel after the adjustment, and a color shift may finally occur in the projected image. I can't say.

The liquid crystal panel itself is composed of two kinds of members, namely, glass which is a supporting portion for supporting the liquid crystal portion, and a synthetic resin material which supports the entire glass portion. These two types of materials that have been used as general materials in the past are, for example, many combinations of ordinary glass materials and polycarbonate materials. In this case, the linear expansion coefficients of the respective materials are different from each other by about one digit, ie, 7.7 to 80, and mutual displacement may occur due to a temperature change. .

[0008]

In the above two prior arts, the displacement between the fixed frame attached to the prism and the frame plate to which the liquid crystal panel is adhered has not been sufficiently considered. Further, in the example described in the one case after the above-mentioned prior art, maintenance of the liquid crystal panel was not sufficiently considered. Further, as a problem common to the examples described in the three cases described above, there is a temperature cycle in the usage condition, despite the fact that the configuration of the liquid crystal panel itself is made of members having different linear expansion coefficients. It has not been sufficiently considered that the attached portion may move due to shrinkage.

An object of the present invention is to solve the above-mentioned drawbacks of the prior art and to provide a technique for preventing a displacement of a mounting position after mounting a light valve element.

Another object of the present invention is to provide a technique for preventing the light valve element itself from moving inside.

[0011]

In order to achieve the object of the present invention, a light valve element mounting structure provided by the present invention includes a light valve element structure itself provided with a brazing portion, and a light valve housing. And an integral mounting part. Since the brazing portion is provided integrally with the light valve element itself, no displacement occurs between the light valve element and the mounting portion. Further, the linear expansion coefficients of the housing portion of the light valve element and the constituent material of the light valve element are made substantially equal to each other, and this is a means for preventing displacement due to a difference in expansion / contraction length due to a temperature cycle. By adjusting the coefficient of linear expansion, a means for preventing displacement of pixels due to a temperature cycle in the light valve element is provided.

The details will be described below. In the first invention, in the panel, a metal brazing portion is provided on a support for supporting the light valve element of the light valve means. In the second invention, in the panel, the metal brazing portion is integrally provided on the support of the light valve means. In the first and second inventions, the metal brazing portion is fixed by soldering means. Further, when the minimum linear expansion coefficient among the linear expansion coefficients of the liquid crystal display member and the support provided in the light valve means is 1, the other linear expansion coefficients are in the range of 1 to 3. It is composed of

[0013] In the third aspect of the present invention, when the minimum linear expansion coefficient among the linear expansion coefficients of the liquid crystal display member and the mounting support member is 1, the other linear expansion coefficients are in the range of 1-3. It is configured to

In the fourth invention, the panel built-in structure includes:
A light valve means integrally provided with a metal brazing portion on the support structure is fixed to the object by the metal brazing means. In the fifth invention, the panel built-in structure is provided with a metal brazing portion on a support for supporting the light valve element,
A metal brazing portion is provided on a holding body for holding the optical member, and these metal brazing portions are welded by metal brazing means.
In the fourth and fifth inventions, the panel built-in structure comprises:
The metal brazing means is welded by solder.

According to a sixth aspect of the present invention, in an optical unit for projecting light from a light source to a light valve means through an optical system, a metal brazing portion is integrally provided on a support of the light valve means, and the metal brazing portion is provided. Metal brazing and welding are performed on the holder that holds the optical member.

In the seventh invention, the illuminating means, the separating means for separating the luminous flux of the illuminating means into a plurality of colors, the light valve means for receiving the separated luminous flux, and the light emitted from the light valve means An optical unit comprising a combining unit for combining a plurality of colors of light and a projecting unit, wherein the light modulated by the light valve unit is projected by the projection unit and displayed as an image, and the light unit supports the light valve unit. The body is integrally provided with a metal brazing part.

In the eighth invention, in the display device, the light valve means having the support structure portion integrally provided with the metal brazing portion is fixed to the object by the metal brazing portion.
In a ninth invention, in a display device in which light from a light source is projected through an optical system to a light valve means and light from the light valve means is incident on a projection system unit, the first metal member is supported on a support of the light valve means. A brazing portion is provided, a second metal brazing portion is provided on a holder for holding the optical member of the projection system unit, and the first and the above-mentioned metal brazing portions are welded by metal brazing means. In the eighth and ninth inventions, the metal brazing welding means is a soldering means.

Further, as a tenth invention, a display device comprises:
The panel of the invention described above, a panel built-in structure, or
An optical unit is provided.

In the eleventh invention, in the fixing method, the light valve means provided integrally with the metal brazing portion in the support structure portion is fixed to the object by the metal brazing means. Also,
In this fixing method, the metal brazing means is soldering means.

[0020]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The embodiments of the present invention will be described below with reference to the drawings by using some embodiments. Hereinafter, a first embodiment of a panel, a panel built-in structure, an optical unit, a display device, and a fixing method according to the present invention will be described with reference to FIGS. FIG. 1 is a configuration diagram showing one embodiment of a liquid crystal panel according to the present invention, and FIG.
FIG. 1B is a sectional view taken along the line AA in FIG. 1B, and FIG. 1B is a front view. In FIG. 1, a liquid crystal panel 2 is of a form that operates as a reflective light valve element. That is, the light input / output surface 20 of the light valve panel, for example, the liquid crystal panel 2
Light incident on the 0 side is reflected after being modulated inside the liquid crystal panel, exits from the same light entrance / exit surface 200, and proceeds to the outside of the panel. As shown in FIG. 1A, the liquid crystal panel 2
A liquid crystal layer 202 which is formed on a base 201 and performs a liquid crystal operation is a silicon substrate 2 on which a driving circuit is provided.
A liquid crystal material is sealed in a space having a predetermined thickness, for example, 5 micrometers, and the like. Silicon substrate 2
Reference numeral 05 denotes a liquid crystal layer side (drive circuit surface side) on which the semiconductor for performing the circuit operation is formed, that is, the liquid crystal layer 202, which is made of silicon crystal, which is a material on which the semiconductor is formed and performs the circuit operation. Adjacent surfaces are mirror polished. A flexible cable 209 is used to transfer electric signals from outside the liquid crystal panel 2. An end of the flexible cable 209 is connected to a circuit portion of the silicon substrate 205, and performs an image display operation as the liquid crystal panel 2 by a signal from a circuit (not shown). The image display operation on the liquid crystal surface is performed by applying a voltage between the drive circuit on the silicon substrate 205 side and the cover glass 203 provided with the transparent electrode facing the silicon substrate 205 to change the polarization direction of the liquid crystal material and to change the polarization of the reflected light. This is done by changing the direction. The silicon substrate 205 is provided with electrodes corresponding to a two-dimensional pixel array corresponding to a screen, and can display a two-dimensional image by selectively driving the two-dimensional pixels.

Also, the end of the base 201 is shown in FIG.
As shown in the figure, the metal brazing portions 207a, 207b, 2
07c and 207d are provided. In the drawing, reference numeral 210 denotes a screw hole for attaching a radiation fin described later, and reference numeral 201a denotes a rising portion of the base 201.

Next, the internal structure of the liquid crystal panel will be described with reference to the sectional view shown in FIG. The silicon substrate 205 is supported on the base 201 via a heat conductive member 208 made of, for example, a rubber for heat conduction. Further, a cover glass 203 sandwiching the liquid crystal layer 202 is provided.
Is pressed by a panel frame 206 formed of a synthetic resin or the like, and the panel frame 206 is bonded to the base 201 or formed integrally with the base 201 by outsert integral molding.
Fixed against. A dustproof glass 204 is provided on the cover glass 203, and the outside is a light incident / exit surface 200. Further, an adhesive is filled between the panel frame 206, the silicon substrate 205, and the cover glass 203, that is, an empty space of the panel frame 206 in FIG. The silicon substrate 205 as a part is adhered and fixed.

In the embodiment shown in FIG.
When silicon substrate 205 constituting C is made of, for example, a silicon single crystal substrate, the linear expansion coefficient is, for example, 4.1.
5 × 10 ⁻⁶ cm / ° C. On the other hand, if the cover glass 203 and the dustproof glass are 1737 type glass,
The linear expansion coefficient is, for example, 3.78 × 10 ⁻⁶ cm / ° C. When the base 201 is made of, for example, a 42 alloy material, the linear expansion coefficient is, for example, 4.6 × 10 ⁻⁶ cm /.
° C. In this embodiment, assuming that the linear expansion coefficient of the cover glass 203 and the dustproof glass is 1, the linear expansion coefficients of the other members, that is, the silicon substrate 205 and the base 201, are between 1 and 1.2. As described above, by adjusting the linear expansion coefficients of the main members, it is possible to prevent the positional relationship between the members from shifting due to a temperature change.

In this embodiment, an example in which the coefficient of linear expansion between the members to be bonded is between 1 and 1.2 has been described. Assuming that the coefficient of expansion is 1, if the linear expansion coefficient of the other main members is in the range of about 1 to 3, it is found that the same effect can be obtained.

As shown in FIG. 1A, the light input / output surface 20
Light entering from 0 is modulated by the liquid crystal layer 202, reflected on the surface of the silicon substrate 205, and emitted again from the light input / output surface 200 to the outside of the liquid crystal panel 2. In this case, light energy is absorbed by the liquid crystal layer 202 and the silicon substrate 205 serving as a reflection surface to become heat energy. The liquid crystal material is generally made of a polymer material, and has a limited operating temperature range, for example, 70 ° C. at the maximum. For this reason, when the temperature of the liquid crystal surface rises to a certain degree or more, the liquid crystal panel does not operate normally, and thus needs to be cooled.

Most of the generated energy is transmitted from the silicon substrate 205 having high thermal conductivity to the base 201 via the thermal conductive member 208 made of a thermal conductive elastomer material. On the outside of the base 201, a radiating means described later, for example, a radiating fin is provided, and cooling is performed. By doing so, heat generated on the liquid crystal surface can be taken out of the liquid crystal panel and cooled.

At the four outer corners of the base 201, metal brazing portions 207a to 207b are provided, and these portions can be welded to the object using a metal brazing, for example, solder. In the metal brazing portions 207a to 207b, the shape of the metal brazing portions 207a to 207b is a branch extending from the base 201 so as to prevent the heat of the solder from being transmitted to the liquid crystal surface during welding, thereby increasing the thermal resistance. Further, it is preferable that the heat of the solder is not transmitted to the liquid crystal surface by applying a heat block by, for example, clamping the base of the branch portion with another member at the time of soldering. In addition, as a method of attaching the four attachment portions, it is possible to prevent thermal deformation of the base 201 by attaching them one by one in order. In addition, when removing during maintenance, by removing solder one by one in order,
The base 201 can be removed while preventing thermal deformation.

FIG. 2 is a perspective view showing the appearance of the liquid crystal panel shown in FIG. The liquid crystal panel 2 is formed on a base 201, and metal brazing portions 2 are provided at four corners of the base 201.
07a to 207d are provided. After the position and orientation of the entire liquid crystal panel 2 are adjusted, these brazing portions 2 are adjusted.
07 and a support portion to be described later are fixed by welding with metal brazing.

FIG. 3 is a perspective view showing an embodiment of a display device according to the present invention. This display device is, for example, a video display device using a liquid crystal panel. An optical unit is accommodated inside the image display device 1, and a liquid crystal panel is attached to the optical unit. In the image display device 1 shown in the figure, a projection lens unit, which is a part of the projection system unit 500, is exposed outside the outer casing of the image display device 1, and an image is projected on an external screen or the like by the projection lens unit. Projected. In front of the intake 1
10, an exhaust port 111 is provided on the rear side,
After taking in outside air from the intake port 110 and cooling the inside of the device,
The warmed air is discharged from the exhaust port 111 to the outside of the apparatus.
The operation of the device is performed with the operation button 113, or
This is performed by receiving an operation signal from the outside by the remote operation receiving unit 117. When the device is moved, the handle 1
22 are used.

FIG. 4 is a bottom perspective view of the display device shown in FIG. A light source replacement cover 114 is provided on the bottom surface side of the image display device 1. The cover 114 is opened to replace the light source. Further, an adjustment leg 112 and an adjustment leg 115 for adjusting the installation angle of the entire apparatus to adjust the angle of the projected image are provided. By adjusting the height of these two legs 112 and 115, fine adjustment of the position and inclination of the projected image is performed. An external video signal is input to the device 1 from the input terminal 118 or the input terminal 120. The power supply is a power connector 11
9 is input. Another remote operation receiver 116 is provided on the rear side of the apparatus, and operates in the same manner as the receiver shown in FIG.

On the opposite side of the handle 122 shown in FIG. 3, legs 121a and 121b are provided at a position higher than the input terminal, and when the handle 122 is held on the floor or the like, the input terminal 118 is provided. FIG. 5 is a perspective view showing one embodiment of the internal configuration of the optical system of the display device shown in FIG.
In the figure, a light beam having an appropriate amount of light emitted from a light source 151 passes through an integrator lens 152, and an optical component 153 composed of another integrator lens and a polarization conversion element. Then, after passing through the collimator lens 154, it is reflected by the reflection mirror 155. Further, after being reflected by another reflection mirror 156, the light is incident on a polarizing prism 158 through a condenser lens 157. The polarizing prism 158 reflects the polarized light that has been aligned in advance. The characteristics of this internal reflective surface are:
The light is reflected in a specific polarization direction and transmitted in another polarization direction.

Then, the light proceeds to the first prism 159, and the light of a specific range of wavelength, for example, 400 nm to 500 nm is applied to the dichroic mirror surface on the exit surface.
, The so-called blue component light is reflected and finally enters the liquid crystal panel 2B for blue. The light of the red component (for example, in the wavelength range of 600 to 700 nm) is reflected on the exit surface side of the second prism 160 and enters the liquid crystal panel 2R in charge of red. The light of the remaining green component (for example, in the wavelength range of 500 to 600 nm) is incident on the liquid crystal panel 2G for green via the third prism 161.

In each of the liquid crystal panels 2R, 2G and 2B, the incident light is modulated according to the pixels arranged two-dimensionally on the liquid crystal surface, and the polarization direction is changed or not changed. Two types of reflected light are emitted. And
For example, the green components are prisms 161, 160, 1
After passing through 59, the light enters the polarizing prism 158. In the polarizing prism 158, depending on the polarization direction, reflection on the reflection film,
Alternatively, transmission is selected, and the liquid crystal panels 2R, 2
In G or 2B, for example, the polarization direction changed from the original polarization direction is transmitted and the projection lens 501 is transmitted.
Is incident on. Those whose polarization direction cannot be changed are reflected and returned to the original light source side.

The light of the other two color components is also transmitted to the prism 1
The light is synthesized by the light sources 60 and 159 and is incident on the polarizing prism 158, and further incident on the projection lens 501 in the same manner as the green component light. In this case, the projection lens 50
The focal position 1 is set on the liquid crystal panel surface via the prism portion, and the images modulated by the liquid crystal panels 2R, 2G, and 2B are projected as images outside the apparatus. In addition,
In the configuration of the optical system shown in the figure, the optical system includes both a case including a projection lens and a case excluding the projection lens.

FIG. 6 is an enlarged perspective view around the prism portion of the optical system shown in FIG. Holders 556R, 556G, 556B are provided on the emission surface side for each color component of the prism. And each holder 556R,
556G and 556B have liquid crystal panels 2 for each color
R, 2G and 2B are attached respectively. The liquid crystal panel 2 and the holder 556 are fixed by welding using metal brazing, for example, solder.

FIG. 7 is an exploded perspective view showing one embodiment of a fixed portion of the liquid crystal panel and the prism of FIG. In the figure,
A brazing portion 207a of the base 201 of the liquid crystal panel 2G,
207b, 207c, 207d and brazing portions 557a, 557b (not shown) of holder 556, 557c,
57d and brazing. In this case, the position and orientation of the liquid crystal panel 2G are adjusted to determine a predetermined position, and then the brazing portion is soldered. The melted solder is soldered by the surface tension to the brazing portions 207a to 207d of the base 201 of the liquid crystal panel 2G and the brazing portion 557a of the holder.
To fill the gap with 557d. When the solder returns to room temperature, it becomes solid and welding is completed.

A radiating fin 558 is attached to the heat radiating surface of the liquid crystal panel 2G on the back side of the base 201 by using a screw hole 210 provided in the base 201. Further, the bonding portions 559a, 559b provided on the holder 556G,
The third prism 161 is inserted between 559c and 559d, and the space between the adhesive portions 559a, 559b, 559c, and 559d and the third prism 161 is adhesively fixed with an adhesive.

FIG. 8 is a perspective view showing an embodiment in which the liquid crystal panel and the prism of FIG. 7 are assembled and fixed. Brazing portions 207a to 207 of base 201 of liquid crystal panel 2G
3D shows a state in which a soldering portion 560 is formed by soldering the space between the soldering portion d and the brazing portions 557a to 557d of the holder 556. In this state, the liquid crystal panel 2G and the holder 5
56 are welded and fixed. In this state, the liquid crystal panel 2G is fixed to the third prism 161 via the holder 556. That is, the liquid crystal panel 2G
Since the entire image display portion and the third prism portion are fixed by bonding or welding, it is possible to provide an apparatus that does not have any element that causes a shift after the posture position adjustment and that does not cause a position shift. it can.

Hereinafter, a second embodiment of the present invention will be described with reference to FIGS. FIG. 9 is a configuration diagram showing another embodiment of the light valve panel according to the present invention.
9A is a sectional view taken along line BB of FIG. 9B, and FIG. 9B is a front view. In FIG. 9, the liquid crystal panel 3 is of a form that operates as a transmissive light valve element. That is, light incident on the light incident surface 300 side of the liquid crystal panel 3 is modulated inside the liquid crystal panel, transmitted, emitted from the light emission surface 301, and proceeds to the outside of the panel. FIG.
As shown in (a), the liquid crystal panel 3 is formed on a base 201, and a liquid crystal layer 303 for performing a liquid crystal operation is provided between a TFT glass substrate 305 provided with a driving circuit and a cover glass 304. The liquid crystal material is sealed in a space having a predetermined thickness, for example, 5 micrometers. A semiconductor is formed on the surface of the TFT glass substrate 305. TFT glass substrate 30
By applying a voltage between the drive circuit on the fifth side and the cover glass 304 provided with the transparent electrode facing the drive circuit, the polarization direction of the liquid crystal material changes, and the polarization direction of the transmitted light can be changed. The TFT glass substrate 305
Electrodes are provided corresponding to the two-dimensional pixel array corresponding to the screen, and by selectively driving the two-dimensional pixels,
It can be displayed as a two-dimensional image. Further, metal brazing portions 207a, 207b, 207c, 207d are provided at the end of the base 201 as shown in FIG.

Next, the internal structure of the liquid crystal panel will be described with reference to FIG. The panel frame 306 is the base 20
1 or fixed to the base 201 by outsert integral molding. TFT glass substrate 3
05 is sandwiched between the cover glass 304 and the dustproof glass 307, and these are sandwiched by the panel frame 306. The surface of the dustproof glass 307 provided on the emission surface side of the TFT glass substrate 305 is the emission surface 301. Further, the panel frame 306 and the TFT glass substrate 305
An adhesive is filled between the substrate 201 and the cover glass 304, and a TFT serving as a liquid crystal display portion is
The glass substrate 305 is bonded and fixed.

In the embodiment shown in FIG. 9, when the TFT glass substrate 305 is made of, for example, BK-7 type glass, the coefficient of linear expansion is, for example, 7.2 × 10 ⁻⁶ cm / ° C. On the other hand, if the cover glass 304 and the dustproof glass 307 are also made of BK-7 type glass, the coefficient of linear expansion is, for example, 7.2 × 10 ⁻⁶ cm / ° C. When base 201 is made of, for example, a permalloy material, the coefficient of linear expansion is, for example, 7.7 × 10 ⁻⁶ cm / ° C. In this embodiment, assuming that the linear expansion coefficient of the member having the smallest linear expansion coefficient is 1, the linear expansion coefficient of the other main member is in the range of 1 to 1.1. As described above, by adjusting the linear expansion coefficients of the main members, it is possible to prevent the positional relationship between the members from shifting due to a temperature change. In the present embodiment, an example in which the coefficient of linear expansion is in the range of 1 to 1.1 has been described. However, in practice, the range of about 1 to 3 is sufficient, and the same effect can be obtained.

As shown in FIG. 9A, the light incident surface 300
The light that has entered through is modulated by the liquid crystal layer 303 and emitted from the light emission surface 301 to the outside of the liquid crystal panel 3. When light passes through the liquid crystal panel, the TFT glass substrate 305 on which the liquid crystal layer 303 and the driving transistor are formed is formed.
In this case, light energy is absorbed and becomes heat energy. In other words, the temperature of the liquid crystal panel rises during operation,
The TFT glass substrate 305 expands, and when stopped, the temperature returns to its original value and contracts. Expansion and contraction occur in conjunction with the operation and stoppage of the liquid crystal panel 3, so that a so-called thermal cycle is applied. However, since the TFT glass substrate 305, the surrounding cover glass 304, the dustproof glass 307, and the base 201 supporting them are made of a material having a linear expansion coefficient within a predetermined range, the position of the image position with respect to the thermal cycle is reduced. Movement can be prevented.

Since the metal brazing portions 207a to 207d are provided at the four outer corners of the base 201, it is possible to weld the metal brazing parts to the object by using metal brazing, for example, solder. In order to prevent the heat of the solder from being transmitted to the liquid crystal surface during welding, the shape of the metal brazing portions 207a to 207d is set as a branch portion extending from the base 201 so as to obtain a large thermal resistance. Furthermore, it is more preferable that the heat of the solder is not transmitted to the liquid crystal surface by applying a heat block by, for example, clamping the root of the branch portion with another member at the time of soldering. In addition, there are four mounting portions 207a.
As for the mounting method of to 207d, thermal deformation of the base 201 can be prevented by sequentially mounting the base 201 one by one. Also, when removing at the time of maintenance, by removing the solder one by one in order,
The base 201 can be removed while preventing thermal deformation.

FIG. 10 is a perspective view showing the appearance of the liquid crystal panel shown in FIG. The liquid crystal panel 3 is formed on a base 201, and metal brazing portions 2 are provided at four corners of the base 201.
07a to 207d are provided. After the position and orientation of the entire liquid crystal panel 2 are adjusted, these brazing portions 2 are adjusted.
07a to 207d and a holder for holding a prism to be described later can be fixed by welding with metal brazing.

FIG. 11 is a perspective view showing another embodiment of the internal structure of the optical system of the display device according to the present invention. In the figure,
A light beam of an appropriate amount emitted from the light source 151 is first transmitted to the integrator lens 152 and the integrator lens 15.
After passing through the collimator lens 3 and the collimator lens 401, the light is reflected by the reflection mirror 407, passes through the collimator lens 450, and is guided to the dichroic mirror 408. The dichroic mirror 408 separates the light into two color components, for example, red and cyan components, transmits the red component to the reflection mirror 412, and reflects the cyan component to the dichroic mirror 409. Dichroic mirror 40
At 9, the incident cyan component is further separated into two color components, for example, a green component and a blue component, and the green component is reflected and guided to the condenser lens 405, and the blue component is transmitted to the relay lens 402. In this way, the image is separated into a plurality of color components necessary for color image expression.

The separated luminous flux of each color component is supplied to the liquid crystal panel 3 which is a light valve means for taking charge of each color component.
R, 3G, and 3B are incident. That is, the reflection mirror 4
The red light beam reflected from 12 is
The light is incident on the liquid crystal panel 3R via the reference numeral 4. The green luminous flux incident on the condenser lens 405 is applied to the liquid crystal panel 3G.
Is incident on. The light flux of the blue component incident on the relay lens 402 is filtered by the filter 419 and the reflection mirror 41.
0, the light enters the liquid crystal panel 3B through the relay lens 403, the reflection mirror 411, and the condenser lens 406. An image is displayed on the liquid crystal panels 3R, 3G, and 3B of each color component by a drive circuit unit (not shown). As described above, the incident light of each color component is modulated by the light valve unit and enters the projection system unit 500. Is done. The projection system unit 500 is provided with prism means 451 as combining means for combining light beams of a plurality of color components.
The finally modulated light beam is emitted to the outside of the device by the projection lens 501. Thus, a liquid crystal panel for displaying each color, 3R, 3G, 3 is displayed on a screen (not shown).
The image displayed on B is enlarged and projected as a video.

FIG. 12 is a perspective view showing the structure of the peripheral portion of the prism shown in FIG. Holders 556R, 556G, and 556B are provided on the incident surface side of the prism 451, respectively. And each holder 556
Liquid crystal panels 3R, 3G, and 3B in charge of each color are attached to R, 556G, and 556B, respectively. The fixed brazing portion 560 between the liquid crystal panel 3 and the holder 556 is welded using a metal braze, for example, solder.

FIG. 13 is an exploded perspective view showing one embodiment of a fixed portion of the liquid crystal panel and the prism of FIG. As shown in the figure, the brazing portion 207 of the liquid crystal panel 3 and the holder 5
The 56 brazing portions 557 are brazed so as to face each other. In this case, the position and orientation of the liquid crystal panel 3 are adjusted to determine a predetermined position, and then the brazing portion 557 is soldered. The molten solder fills a gap between the brazing portion 207 of the liquid crystal panel 3 and the brazing portion 557 of the holder due to surface tension. When the solder returns to room temperature, it becomes solid and welding is completed. In addition, the holders 556 have bonding portions 559a to 559a.
59d, and the bonding portions 559a to 559
d, the prisms 451 are inserted, and
The prism 451 is adhesively fixed to 59d.

As described above, in the embodiment of the present invention, an example in which a liquid crystal panel is used as a light valve panel has been described. However, other light valve means other than the panel, for example, a micro mirror driving system, a laser address liquid crystal, Any method, such as a method, which can modulate incident light and project it as an image, can be applied to the transmission method and the reflection method in the same manner and can be realized. Also, the description has been given of a so-called three-plate system using three light valve units. However, it goes without saying that a system using two or one light valve unit has the same effect. In the description of the projection type device in the present embodiment, an example in which the projection is performed from the front to the screen is used as an example, but the same effect can be obtained even when applied to a so-called rear projection type device that projects from the back side. .

In the description of the external shape of the device, a portable small device has been described as an example. However, the device is fixed and used, for example, in a form fixed to a theater or the like, or integrated with a building or building installed outdoors. It goes without saying that the same effect can be obtained also when the present invention is applied to a different form. In addition, although soldering has been described as an example of metal brazing, it is needless to say that many kinds of metal brazing such as aluminum brazing or brass brazing can be similarly performed. Further, as a material of the base portion integrated with the liquid crystal panel, a 42 alloy or a permalloy material is given as an example, but it goes without saying that a material having a required linear expansion coefficient can be easily selected from other materials.

[0051]

As described above, according to the present invention, since the light valve panel and the metal brazing portion of the mounting portion are integrated, displacement of the fixed panel can be prevented, and metal brazing is performed during maintenance. The light valve panel can be removed by removing the part. Further, by setting the coefficient of linear expansion in the light valve panel to be within a predetermined range, it is possible to prevent a displacement in the light valve panel due to a temperature cycle.

[Brief description of the drawings]

FIG. 1 is a configuration diagram showing one embodiment of a light valve panel according to the present invention.

FIG. 2 is a perspective view showing an appearance of the liquid crystal panel shown in FIG.

FIG. 3 is a perspective view showing one embodiment of a display device according to the present invention.

FIG. 4 is a perspective view of a bottom side of the display device shown in FIG.

FIG. 5 is a perspective view showing an embodiment of the internal configuration of the optical system of the display device shown in FIG.

FIG. 6 is an enlarged perspective view around a prism portion of the optical system shown in FIG. 5;

FIG. 7 is an exploded perspective view showing one embodiment of a fixed portion of the liquid crystal panel and the prism of FIG. 6;

FIG. 8 is a perspective view showing one embodiment when the liquid crystal panel and the prism of FIG. 7 are assembled and fixed.

FIG. 9 is a configuration diagram showing another embodiment of a light valve panel according to the present invention.

FIG. 10 is a perspective view showing an appearance of the liquid crystal panel shown in FIG.

FIG. 11 is a perspective view showing another embodiment of the internal structure of the optical system of the display device according to the present invention.

FIG. 12 is a perspective view showing a configuration of a peripheral portion of the prism shown in FIG.

FIG. 13 is an exploded perspective view showing one embodiment of a fixed portion of the liquid crystal panel and the prism of FIG. 12;

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Display apparatus, 2 ... Liquid crystal panel, 200 ... Light incidence surface, 2
01: base, 202: liquid crystal layer, 203: cover glass, 205: silicon substrate, 207: brazing part, 20
Reference numeral 8: heat conductive member, 556: holder, 557: holder brazing portion, 3: transmission type liquid crystal panel, 300: incident surface,
Reference numeral 301 denotes an emission surface, 303 denotes a liquid crystal layer, 304 denotes a cover glass, and 305 denotes a TFT glass substrate.

 ──────────────────────────────────────────────────の Continuing from the front page (72) Inventor Kazuya Takemoto 3300 Hayano, Mobara City, Chiba Prefecture Within the Hitachi, Ltd. Display Group (72) Inventor Shu Iguchi 3681 Hayano, Mobara City, Chiba Prefecture Hitachi Device Engineering Co., Ltd. (72) Inventor Tatsumi Hasebe 292 Yoshida-cho, Totsuka-ku, Yokohama-shi, Kanagawa Prefecture Inside Digital Media System Division, Hitachi, Ltd. (72) Inventor Yoshimasa Takeuchi 292 Yoshida-cho, Totsuka-ku, Yokohama-shi, Kanagawa Prefecture Co., Ltd. F-term in Hitachi Digital Media System Division (reference) 2H088 EA12 HA13 HA21 HA23 HA24 HA28 MA20 2H089 HA40 QA02 QA06 QA09 TA16 TA18 UA05 5G435 BB02 BB12 DD06 EE05 GG43 KK02 LL04 LL15

Claims (18)

[Claims] 1. A panel wherein a metal brazing portion is provided on a support for supporting a light valve element of a light valve means. 2. A panel wherein a metal brazing portion is integrally provided on a support of the light valve means. 3. The panel according to claim 1, wherein said metal brazing portion is fixed by soldering means. 4. The panel according to claim 1, wherein a minimum linear expansion coefficient is set to 1 among linear expansion coefficients of a liquid crystal display member provided in the light valve means and the support. A panel having another coefficient of linear expansion in a range of 1 to 3. 5. A panel characterized in that, when the minimum linear expansion coefficient is 1 among the linear expansion coefficients of the liquid crystal display member and the mounting support member, the other linear expansion coefficients are in the range of 1-3. . 6. A panel built-in structure, wherein a light valve means integrally provided with a metal brazing portion on a support structure is fixed to an object by metal brazing means. 7. A metal brazing portion is provided on a support for supporting the light valve element, a metal brazing portion is provided on a holder for holding the optical member, and the metal brazing portions are welded by metal brazing means. A panel built-in structure characterized by the above-mentioned. 8. The panel-integrated structure according to claim 6, wherein said metal brazing means is welded by solder. 9. An optical unit for projecting light from a light source to a light valve means through an optical system, wherein a metal brazing portion is integrally provided on a support of the light valve means, and the metal brazing portion holds an optical member. An optical unit characterized in that metal holders are welded to a holder by metal brazing. 10. An illuminating means, a separating means for separating a light beam of the illuminating means into a plurality of colors, a light valve means on which the separated luminous flux is incident, and the light of the plurality of colors emitted from the light valve means. An optical unit having a synthesizing unit for synthesizing the light valve unit, and projecting the light modulated by the light valve unit by the projection unit and displaying the image as an image. An optical unit, wherein an attachment portion is provided integrally. 11. A display device, wherein a light valve means integrally provided with a metal brazing weld portion on a support structure portion is fixed to an object by metal brazing welding means. 12. A display device in which light from a light source is projected onto a light valve means through an optical system, and light from the light valve means is incident on a projection system unit. A second metal brazing portion is provided on a holder for holding the optical member of the projection system unit, and the first and the above-mentioned metal brazing portions are welded by metal brazing means. Display device. 13. A display device according to claim 11, wherein said metal brazing means is soldering means. 14. A display device using the panel according to claim 1, 2, 3, 4, or 5. 15. A display device using the panel built-in structure according to claim 6, 7, or 8. 16. A display device using the optical unit according to claim 9. 17. A method for fixing a light valve panel, comprising: fixing a light valve means provided integrally with a metal brazing portion to a support structure to an object by means of a metal brazing means. 18. A method according to claim 17, wherein said metal brazing means is soldering means.