JP2006250968A - Projection type display device, and method and device for adjusting and attaching liquid crystal display element for projection type display device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide the compound prism unit of a projection type display device capable of realizing accurate adjustment and the bonding of a liquid crystal display element by performing the alignment adjustment of the liquid crystal display element and a compound prism at the bonded part between the liquid crystal display element and the compound prism and making space between components secured as a margin for adjusting small, thereby reducing bonding material with which the space between the components is filled. <P>SOLUTION: The margins for adjusting in terms of tilt and shift two axes (α and β) and focus one axis (Z axis) of a holding frame 3 holding the liquid crystal display element 4 relative to the compound prism 1 are absorbed by the first bonding material (adhesive) between the holding frame 3 and an intermediate member 2, and the liquid crystal display element 4 and the intermediate member 2 integrated by the first bonding material are adjusted in terms of in-plane three axes (X, Y and θ) relative to the compound prism 1, and the margins for adjusting in terms of the in-plane three axes are absorbed by second bonding material (adhesive) between the intermediate member 2 and the compound prism 1. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a projection display device, a liquid crystal display element adjustment adhesion method and a liquid crystal display element adjustment adhesion device for a projection display device, and more specifically, a liquid crystal display element which is a constituent element of a projection display device. Projection-type display with easy adjustment of two axes of tilt (α, β) and one axis of focus (Z axis), and in-plane three axes (X, Y, θ) with respect to the composite prism The present invention relates to an apparatus, a liquid crystal display element adjustment adhesion method for a projection display apparatus, and a liquid crystal display element adjustment adhesion apparatus for performing the method.

The following techniques are known as conventional techniques related to the present invention.
The “attachment structure and attachment method of a liquid crystal display element in a liquid crystal projector” disclosed in Patent Document 1 is based on an intermediate member having a UV temporary fixing part for temporarily fixing the liquid crystal display element and a solder fixing part for main fixing. By fixing to the synthesizing means, occurrence of a change with time after alignment adjustment of the liquid crystal display element is eliminated, and high-precision fixing is enabled.

  The “liquid crystal display device mounting structure” disclosed in Patent Document 2 is provided in a hole provided in the first fixing member and in the second fixing member in order to adjust and fix the liquid crystal display element to the combining means. Filling the space formed by the shaft with the first fixing material and solidifying, and then filling the space between the first fixing member and the second fixing member narrower than the space with the second fixing material and solidifying. Thus, it is possible to fix with high accuracy while maintaining the adjustment position.

  The “position-controlled adhesive bonding method and apparatus” disclosed in Patent Document 3 relates to the application of the present applicant, and occurs at a plurality of bonding (curing) locations that contribute to the bonding between the adherend and the adhesive. By controlling the curing shrinkage force and offsetting the stress applied to the adhesive generated by this shrinking force, and maintaining the relative position of the adhesive with respect to the adherend, the initial position shift during bonding is achieved. This enables high-precision bonding with reduced resistance.

  In addition, in the invention disclosed in Patent Document 4 relating to the application of the present applicant, the energy curable adhesive between the first adherend and the second adherend is changed from the first adherend to the second adherend. Separating with a separating member in layers, and curing one of the layers in an uncured state, then curing the remaining uncured layer and joining the first adherend and the second adherend Since the shrinkage force at the time of curing is insulated by the uncured layer and can be cured without being transmitted to the adherend until the last joining, it is possible to perform highly accurate joining.

  Further, in the invention disclosed in Patent Document 5 relating to the application of the present applicant, the holes provided in the adhesive are inserted into the plurality of columnar protrusions provided in the adherend, and the position and posture of the adhesive ( 6) adjusts the balance between the curing shrinkage force of the adhesive by controlling the irradiation of energy rays against the adhesive form in which the adjustment margin between the columnar protrusion and the hole is filled with adhesive and cured and fixed. By providing a bonding method and a bonding apparatus that can adjust and adjust the position and posture of the adhesive, high-precision bonding with reduced positional deviation during bonding is possible.

In addition, the invention disclosed in Patent Document 6 relating to the application of the present applicant is that the adhesive is an irradiation method in which the irradiation intensity of the energy rays applied to the applied adhesive is spatially modulated (gradient) within the adhesive surface. Curing can be cured with a spatial gradient in the progress of the curing process, ensuring fluidity in the adjacent area of the curing adhesive and reducing internal residual stress after curing due to curing shrinkage It is possible to provide an adhesion method with little change over time.
Japanese Patent Laid-Open No. 2001-1000018 JP 2003-149628 A JP 2004-115545 A Japanese Patent Application No. 2003-344423 Japanese Patent Application No. 2004-357442 Japanese Patent Application No. 2004-1000087

  Projection-type display devices such as liquid crystal projectors separate the light from the light source into RGB three-color light, guide it to three liquid crystal display elements through different optical paths, and synthesize the three colors of modulated light modulated through the liquid crystal display element This is a three-plate projection display device that is synthesized by a prism for projection and projected through a projection lens. The three liquid crystal display elements are tilted with respect to the prism for synthesis with two axes (α, β) and one focus axis (Z axis). ), In-plane three axes (X, Y, θ) and a total of six axes need to be adjusted and fixed.

  Conventionally, an adjustment frame having a six-axis adjustment mechanism for three liquid crystal display elements is fixed to the combining prism, and the liquid crystal display element is fixed to the adjustment frame with screws or the like. , I was making adjustments. However, since the adjustment frame with the adjustment mechanism is complex and requires parts costs, an adjustment mechanism is provided on the adjustment device and adjustment jig side of the liquid crystal display element, which is attached to the holding frame and the combining prism to which the liquid crystal display element is fixed. In general, after adjusting the liquid crystal display element, the adjustment margin between the intermediate members is filled and solidified with a fixing material. Solder is often used as the fixing material at the beginning, but a large amount of equipment is required to automatically fill and fix the solder. Therefore, a fixing method using an adhesive that can be easily fixed is often used. In particular, an ultraviolet curable adhesive that can be bonded in a short time without requiring a large-scale facility is used.

  However, the problem that stress (curing shrinkage force) due to volume shrinkage (curing shrinkage) occurs in any type of adhesive during curing is well known. In general, acrylic ultraviolet curable resin cures and shrinks by about 5 to 10%, and epoxy ultraviolet curable resin cures by about 2 to 5%, and the curing shrinkage increases in proportion to the amount of shrinkage. Although the effect of this curing shrinkage force is only a slight decrease in adhesive strength, it is a major problem in precision assembly, and after adjusting with high precision, the adjusted position will shift due to the effect of curing shrinkage. Or the stress accumulated during curing is released by subsequent temperature changes and external forces, causing the position of the component to shift over time.

  By the way, the liquid crystal display elements of the liquid crystal projector have been advanced in high definition and miniaturization, and the pixel size of a fine one is less than 10 μm. Along with this, the adjustment accuracy required for the adjustment of the three liquid crystal display elements is also required, and furthermore, an adhesion method capable of adhering with high accuracy while maintaining the adjustment position and maintaining the adhesion position over time. Is required.

  The mounting structure of the liquid crystal display element in the liquid crystal projector disclosed in Patent Document 1 includes a first intermediate member that is directly attached to the combining means and a second intermediate member that is fixed to the liquid crystal display element. A temporary fixing UV temporary fixing portion is formed on one of the member and the second intermediate member, and further having a main fixing solder fixing portion that is fixed with solder, thereby accurately aligning the position of the liquid crystal display element. The state can be temporarily fixed with UV adhesive, and then fixed with solder with little change over time, so that high-precision adjustment and fixing corresponding to miniaturization and high definition of the liquid crystal display element is possible. is there.

  In addition, the liquid crystal display device disclosed in Patent Document 2 is temporarily fixed with a UV adhesive and finally fixed with solder, similarly to the mounting structure of the liquid crystal display element in the liquid crystal projector disclosed in Patent Document 1. The fixing process is the same, but the first fixing material (UV adhesive) is filled in the space formed by the hole provided in the first fixing member and the shaft provided in the second fixing member. Temporary fixing is performed by solidification, and the second fixing material (solder) is filled into a space narrower than the temporary fixing space provided between the first fixing member and the second fixing member, and then fixed. Thus, it can be fixed with a smaller amount of fixing material, and more accurate adjustment and fixing corresponding to miniaturization and high definition of the liquid crystal display element size become possible.

  However, in these methods, the second intermediate member (second fixing member) in which the liquid crystal display element is attached to the first intermediate member (first fixing member) that is attached in advance to the synthesizing means (synthesis prism). The liquid crystal display element is adjusted at an interval provided between the first intermediate member (first fixing member) and the second intermediate member (second fixing member) in order to perform the position adjustment and to perform the fixing while maintaining the adjustment position. All adjustment allowances for the six axes (two tilt axes (α, β), one focus axis (Z axis), and three in-plane axes (X, Y, θ)) must be absorbed. Further, in order to prevent the balance of the amount of the fixing material to be filled after adjustment at a plurality of fixing locations from changing greatly, a relatively large interval must be provided between the members. Therefore, the amount of the fixing material increases, and the member moves due to the shrinkage at the time of fixing, or the residual stress accumulates, and then the stress is released to cause a change with time. In addition, a process and equipment for applying and curing the first fixing material (adhesive) for temporary fixing, and a process and equipment for applying and cooling the second fixing material (solder) for main fixing are required. There is also a problem that the process time becomes long and a facility for handling two kinds of fixing materials is necessary.

  In addition, the invention disclosed in Patent Document 4 shown as the prior art comprises an adhesive layer separated by a separating member in layers from the first adherend toward the second adherend, and one layer is uncured. After being cured in this state, the remaining uncured layer is cured and the first adherend and the second adherend are joined together so that the shrinkage force during curing is insulated and joined by the uncured layer. Since it can be cured without being transmitted to the adherence until the very end, it is possible to reduce the displacement of the parts due to the curing shrinkage force and to perform highly accurate joining.

  In addition, the position control type adhesive bonding method and apparatus disclosed in Patent Document 3 are used to cure the adhesive shrinkage generated at a plurality of bonding (curing) points that contribute to the bonding between the adherend and the adhesive. By controlling, the stress applied to the adhesive generated by the shrinkage force is offset each other, and the relative position of the adhesive with respect to the adherend is maintained and the adhesive is cured, thereby shifting the initial position during bonding. Is reduced.

  In addition, the invention disclosed in Patent Document 5 is an adhesive form in which the high-accuracy adhesion method of the invention disclosed in Patent Document 3 is filled with an adhesive in the adjustment margin between the columnar protrusion and the hole, cured, and fixed. Applying and controlling the energy beam irradiation to adjust the balance of curing shrinkage of the adhesive, and bonding while adjusting the position and orientation of the total 6 axes of the adhesive, high accuracy with reduced positional deviation during bonding Bonding is possible. However, although there is a great effect in reducing the displacement of parts due to the curing shrinkage force of the adhesive at the time of adhesion and increasing the initial adhesion accuracy, there is little effect on the change over time caused by the residual stress at the time of curing. In addition, a separation member is inserted in order to apply the adhesive in layers, or a control means for controlling irradiation of energy rays or complicated control is required, which complicates the conventional process. .

  In the invention disclosed in Patent Document 6, the adhesive is cured by an irradiation method in which the irradiation intensity of the energy rays applied to the applied adhesive is spatially modulated (gradient) within the adhesive surface, thereby allowing the curing process to be performed. Since it can be cured with a spatial gradient in progress, fluidity can be secured in the adjacent area of the adhesive to be cured, internal residual stress after curing due to curing shrinkage can be reduced, and change with time can be reduced. is there. However, in this case as well, an apparatus and control for modulating and irradiating energy rays are required, and there is a problem that the conventional process becomes complicated.

  The present invention provides a liquid crystal display element or a holding frame, an intermediate member, and an adjustment allowance for adjusting two tilt axes (α, β) and one focus axis (Z axis) with respect to the composite prism of the liquid crystal display element or the holding frame for holding the liquid crystal display element. The first fixing material between the liquid crystal display element and the intermediate member is integrally adjusted to adjust the in-plane three axes (X, Y, θ) with respect to the composite prism, and the adjustment allowance is between the intermediate member and the composite prism. The second fixing material absorbs the liquid crystal display element in accordance with the six-axis adjustment of the liquid crystal display element or the holding frame and the intermediate member between the parts, and the intermediate member and the synthetic prism. It is possible to prevent the interval between components at the fixed portion from changing.

  The present invention reduces the interval between parts to be secured as an adjustment allowance, reduces the fixing material to be filled, cure shrinkage when the fixing material is cured, and changes over time due to residual stress release after curing, An object of the present invention is to enable highly accurate adjustment and fixation corresponding to miniaturization and high definition of a liquid crystal display element without changing conventional processes.

  The invention according to claim 1 is a liquid crystal display element or a holding frame for holding the liquid crystal display element, and the adjustment margin of the two tilt axes (α, β) and the focus one axis (Z axis) with respect to the synthetic prism is the liquid crystal display element or Absorbing with the first fixing material between the holding frame and the intermediate member, and adjusting the liquid crystal display element and the intermediate member integrally with the composite prism in three in-plane axes (X, Y, θ), The projection display device is characterized in that the in-plane triaxial adjustment allowance is absorbed by a second fixing material between the intermediate member and the synthetic prism.

  According to a second aspect of the present invention, in the projection display device according to the first aspect, the liquid crystal display element or the holding frame and the fixing portion of the intermediate member are spaced apart from each other parallel to the focus axis (Z axis). It is formed by the fixed surface which has.

  The invention according to claim 3 is the projection type display device according to claim 1, wherein the liquid crystal display element or the holding frame and the intermediate member are provided at the center of the hole formed on one fixing surface and on the other fixing surface. The formed pin-shaped protrusion is inserted, and the first fixing material is filled and fixed between the hole and the pin-shaped protrusion.

  According to a fourth aspect of the present invention, in the projection display device according to the second or third aspect, an interval between the fixed surfaces of the first fixing material is 0.1 to 0.3 mm. .

  According to a fifth aspect of the present invention, in the projection display device according to the first aspect, the fixing portion of the intermediate member to the synthetic prism is parallel to the synthetic prism surface (three in-plane axes (X, Y, θ It is characterized by being formed with a fixed surface along the axis).

  The invention according to claim 6 is the projection display device according to any one of claims 1 to 5, wherein the first fixing material and the second fixing material are adhesives.

  In the invention according to claim 7, the liquid crystal display element or the holding frame for holding the liquid crystal display element is tilted with respect to the intermediate member in contact with the synthetic prism, and the two axes (α, β) and the focus one axis (Z axis) are adjusted. A step of adjusting the in-plane three axes (X, Y, θ) with respect to the synthetic prism integrally with the liquid crystal display element and the intermediate member, and the liquid crystal display element or holding after each adjustment step A method for adhering a liquid crystal display element of a projection display device, comprising: fixing a frame and the intermediate member with a first fixing material; and fixing the intermediate member and the synthetic prism with a second fixing material. Features.

  The invention according to claim 8 is the liquid crystal display element adjustment bonding method of the projection type display device according to claim 7, wherein the liquid crystal display element or the holding frame for holding the liquid crystal display element and the intermediate member are formed. The liquid crystal display element or the holding frame has two tilting axes (α, β) in a state in which the pin-shaped protrusion is inserted into the hole. The focus is adjusted in one axis (Z axis), and an adhesive is filled between the hole and the pin-shaped protrusion to be fixed.

  The invention according to claim 9 is the liquid crystal display element adjustment bonding method of the projection display device according to claim 8, wherein the two axes (α, β) and the focus one axis (Z axis) are adjusted, and the in-plane Before the step of adjusting the three axes (X, Y, θ), the adhesive is filled between the liquid crystal display element or the holding frame and the intermediate member and between the intermediate member and the composite prism, and after the adjustment of the liquid crystal display element It is characterized by being cured.

  According to a tenth aspect of the present invention, there is provided a first holding means for holding a liquid crystal display element or a holding frame for holding the liquid crystal display element, a second holding means for holding an intermediate member, and the first holding means are attached. The liquid crystal display element or the holding frame is tilted with respect to the composite prism by a first adjusting means for adjusting two axes (α, β) and a focus one axis (Z axis), and the second holding means is attached to the liquid crystal. A liquid crystal display element adjusting and bonding apparatus of a projection type display device having a second adjusting means for adjusting the display element or the holding frame and the intermediate member integrally with each other in the in-plane three axes (X, Y, θ) with respect to the synthetic prism. It is characterized by being.

  The invention according to claim 11 is the projection display device according to any one of claims 1 to 6, wherein the holding frame has a positioning shape that fits with the first gripping means, and the intermediate member is the It has the positioning shape fitted with the 2nd holding means, It is characterized by the above-mentioned.

  According to the first aspect of the present invention, the adjustment margin of the tilting two axes (α, β) and the focusing one axis (Z axis) with respect to the synthetic prism of the liquid crystal display element or the holding frame for holding the liquid crystal display element is set as the liquid crystal display element or Absorbed by the first fixing material between the holding frame and the intermediate member, the liquid crystal display element and the intermediate member are integrally adjusted in three in-plane directions (X, Y, θ) with respect to the composite prism, and the adjustment allowance is reduced. By absorbing with the second fixing material between the intermediate member and the synthetic prism, the distance between the liquid crystal display element or the holding frame and the intermediate member and the distance between the intermediate member and the synthetic prism can be reduced, and the amount of the fixing material Therefore, it is possible to provide a projection display device capable of highly accurate joining with reduced displacement due to shrinkage of the fixing material and change with time due to release of residual stress.

  According to the second aspect of the invention, the shape of the fixing portion of the liquid crystal display element or the holding frame and the intermediate member is formed by a fixed surface having a mutually facing interval parallel to the focus axis (Z axis). When adjusting the two axes (α, β) and the focus one axis (Z axis), the distance between the members does not change greatly. Therefore, the distance to be secured as an adjustment margin can be reduced, and the amount of the fixing material to be filled is reduced. Therefore, it is possible to provide a projection display device capable of highly accurate joining with reduced displacement due to shrinkage of the fixing material and change with time due to release of residual stress.

  According to the invention of claim 3, the shape of the fixing portion between the liquid crystal display element or the holding frame and the intermediate member is such that the pin-shaped protrusion is inserted in the center of the hole, and the space between them is filled and fixed with the first fixing material. The pinned protrusion is fixed to the member with the hole with the fixing material surrounded by 360 degrees, and the force acting between the members is balanced and offset by shrinkage of the fixing material and release of the residual stress. In addition to the effect of reducing the amount of material, it is possible to provide a projection display device capable of highly accurate joining with reduced initial component deviation and temporal change.

  According to the fourth aspect of the invention, the distance between the fixed surfaces of the liquid crystal display element or the holding frame and the intermediate member is 0.1 to 0.3 mm, so that the amount of the first fixing material to be filled is reduced. Therefore, it is possible to provide a projection display device capable of highly accurate joining with reduced displacement due to shrinkage of the fixing material and change with time due to release of residual stress.

  According to the invention of claim 5, the shape of the fixing portion between the intermediate member and the composite prism is formed by a fixed surface parallel to the prism surface (along the in-plane three axes (X, Y, θ axes)). Therefore, the adjustment allowance by in-plane adjustment can be absorbed without changing the filling amount of the second fixing material, and the amount of the fixing material to be filled can be reduced. It is possible to provide a projection display device capable of highly accurate bonding with reduced temporal change due to stress release.

  According to the invention of claim 6, the first and second fixing materials used for fixing between the liquid crystal display element or the holding frame and the intermediate member and fixing between the intermediate member and the synthetic prism are adhesives. Providing a high-accuracy projection display device that does not require large-scale equipment for applying and curing the adhesive material, and that is low in cost and has reduced component displacement due to the shrinkage of the adhesive material and changes over time due to the release of residual stress. can do.

  According to the seventh aspect of the present invention, the liquid crystal display element or the holding frame for holding the liquid crystal display element is tilted with respect to the intermediate member in contact with the composite prism with two axes (α, β) and one focus axis (Z axis). A step of adjusting, a step of adjusting the in-plane three axes (X, Y, θ) with respect to the synthetic prism integrally with the liquid crystal display element and the intermediate member, and a liquid crystal display element or holding frame and the intermediate member and intermediate member after the adjustment. And the step of fixing the composite prism with the first and second fixing materials, the distance between the liquid crystal display element or the holding frame and the intermediate member, and the distance between the intermediate member and the composite prism can be reduced. Since the amount of the fixing material can be reduced, the liquid crystal display element adjustment adhesion of the high-precision projection display device in which the displacement of the component due to the shrinkage of the fixing material and the change with time due to the release of the residual stress are reduced is possible.

  According to the eighth aspect of the present invention, the liquid crystal display element or the holding frame for holding the liquid crystal display element and the pair of fixing portions formed of the hole and the pin-like protrusion formed in the intermediate member are provided. By adjusting the two tilt axes (α, β) and focus one axis (Z axis) of the liquid crystal display element or holding frame with the protrusions inserted, and filling and fixing between the hole and the pin-shaped protrusion with an adhesive, The fixing material is fixed to the member with a hole in a state where the fixing material surrounds the pin-shaped protrusion 360 degrees, and the force acting between the members is balanced and offset by shrinkage of the fixing material and release of the residual stress. In addition to the effect of reducing the amount, the liquid crystal display element adjustment adhesion of the high-precision projection type display device in which the initial component deviation and the change with time are further reduced is possible.

  According to the ninth aspect of the present invention, the first and second fixing materials are filled between the respective members before adjustment with an adhesive, and cured after adjustment of the liquid crystal display element, thereby reducing the amount of the fixing material. Since it is possible to reduce the displacement of parts due to the shrinkage of the fixing material and the change over time due to the release of the residual stress, and to eliminate the influence of the component deviation when applying the fixing material, the liquid crystal display element of the projection display device with higher accuracy Adjustment adhesion is possible.

  According to the tenth aspect of the present invention, the first holding means for holding the liquid crystal display element or the holding frame for holding the liquid crystal display element, the second holding means for holding the intermediate member, and the first holding means are provided. A liquid crystal display element to which a liquid crystal display element or a holding frame attached is attached to a first prism for tilting two axes (α, β) and a focus one axis (Z axis) and a second gripping means are attached. Alternatively, by having a second adjustment means for adjusting the in-plane three axes (X, Y, θ) with respect to the synthetic prism integrally with the holding frame and the intermediate member, the distance between the liquid crystal display element or the holding frame and the intermediate member, Since the distance between the intermediate member and the composite prism can be reduced and the amount of the first and second fixing materials can be reduced, the displacement of parts due to the shrinkage of the fixing material and the change over time due to the release of the residual stress can be reduced. Reduced high-precision bonding It is possible to provide a liquid crystal display device adjusting bonding apparatus capable projection display device.

  According to the eleventh aspect of the present invention, the holding frame and the intermediate member have the positioning shapes fitted to the first and second holding means, respectively, so that the positional relationship between the holding frame and the intermediate member and each holding means is Since it is determined well, the liquid crystal display element can be adjusted and bonded with the fixing material while keeping the distance between the holding frame and the fixing part of the intermediate member in the optimum state. It is possible to provide a projection display device capable of highly accurate joining with reduced temporal change due to release.

The present invention relates to a two-axis tilt (α, β), a focus one axis (Z-axis), and a focus one-axis (Z-axis) with respect to the composite prism of the liquid crystal display element at a fixing portion of the liquid crystal display element and the composite prism. In-plane triaxial (X, Y, θ) adjustment to the composite prism of the liquid crystal display element is performed, the fixing material filling the gaps between the parts is reduced, and the curing shrinkage when the fixing material is cured, the residual after curing The purpose is to reduce the time-dependent change due to stress release and to enable high-precision adjustment and fixation corresponding to miniaturization and high definition of the liquid crystal display element. The first fixing material between the liquid crystal display element or the holding frame and the intermediate member is used to adjust the tilting two axes (α, β) and the focus one axis (Z axis) with respect to the synthetic prism of the holding frame holding the element. absorption Then, the liquid crystal display element integrated with the first fixing material and the intermediate member are adjusted in three in-plane axes (X, Y, θ) with respect to the synthetic prism, and the adjustment margin for the in-plane three axes is adjusted. Is absorbed by a second fixing material between the intermediate member and the synthetic prism.

Hereinafter, a projection display device, a liquid crystal display element adjustment bonding method and a liquid crystal display element adjustment bonding device of the present invention will be described with reference to the drawings.
FIG. 1 is a plan view showing an optical system of a projection display device targeted by the present invention.
The projection display device targeted by the present invention separates light from the light source 10 into parallel light via the lens array 11 and the collimator lens 12, and separates it into RGB three-color light by the dichroic mirrors 13 and 15, and the mirror. 14, 17, 19, lenses 20, 21, 22, through three different liquid crystal display elements 4 a, 4 b, 4 c through different optical paths and modulated through the liquid crystal display elements 4 a, 4 b, 4 c A display device that projects light on the screen 24 by combining the light with the combining prism 1 and projecting it through the projection lens 23, which is called a three-plate projection display device.

FIG. 2 is a perspective view illustrating a combining prism unit used in the projection display apparatus according to the first embodiment.
In the projection type display device of Example 1, the composite prism unit in which the three liquid crystal display elements 4a, 4b, and 4c are attached to the composite prism 1 aligns the pixels of the three liquid crystal display elements 4a, 4b, and 4c. Adjust the in-plane 3 axes (X, Y, θ) and adjust the tilt 2 axes (α, β) and focus 1 axis (Z axis) for the composite prism 1 for a total of 6 axes x 3 The liquid crystal display elements 4a, 4b and 4c are fixed and assembled in a state where the positions of the liquid crystal display elements 4a, 4b and 4c are adjusted.

FIG. 3 is an exploded perspective view showing the combining prism unit used in the projection display apparatus of Embodiment 1, and FIG. 4 is an exploded perspective view showing the combining prism unit for one color in FIG. is there. Since the liquid crystal display elements of the respective colors have the same configuration, FIG. 4 shows the liquid crystal display elements of the respective colors as representatives.
The three liquid crystal display elements 4a, 4b, and 4c are for obtaining three colors of modulated light corresponding to the G, R, and B lights, respectively, and the liquid crystal display elements 4 (4a, 4b, and 4c) are the holding frame 3. (3a, 3b, 3c) and an intermediate member 2 (2a, 2b, 2c) are attached to the synthesis prism 1.

The holding frame 3 to which the liquid crystal display element 4 is attached by the screw 5 is fixed to the intermediate member 2, but the fixing portion of the holding frame 3 and the intermediate member 2 faces each other parallel to the focus axis (Z axis), It is formed of fixed surfaces having an interval, and the interval between the two fixed surfaces is 0.1 to 0.3 mm, and this interval is filled with an adhesive as a first fixing material.
Further, the fixing portion of the intermediate member 2 to the synthetic prism 1 is formed by a fixed surface (along the in-plane three axes (X, Y, θ axes)) parallel to the synthetic prism surface, and is combined with the intermediate member 2. An adhesive is filled as a second fixing material used for fixing between the prisms 1.
In this embodiment, the holding frame 3 is interposed between the liquid crystal display element 4 and the intermediate member 2, but the holding frame 3 is not essential, and the liquid crystal display element 4 and the intermediate member 2 are directly fixed. It can also be set as the structure to do.

  When the liquid crystal display element 4 (4a, 4b, 4c) is attached to the composite prism 1, the two tilt axes (α, β) with respect to the composite prism 1 of the liquid crystal display element 4 are adjusted, and the focus 1 axis (Z axis), And three in-plane axes (X, Y, θ) are adjusted and attached to the composite prism. Therefore, in the present invention, the liquid crystal display element 4 is adjusted by adjusting the tilt axis 2 (α, β) and the focus 1 axis (Z axis) of the synthetic prism 1 of the liquid crystal display element 4 or the holding frame 3 that holds the liquid crystal display element. Alternatively, it is absorbed by the first fixing material between the holding frame 3 and the intermediate member 2, and the liquid crystal display element 4 and the intermediate member 2 are integrally adjusted in the in-plane three axes (X, Y, θ) with respect to the synthetic prism 1. The adjustment allowance is absorbed by the second fixing material between the intermediate member 2 and the composite prism 1.

  With this configuration, the adjustment movement along the focus axis (Z-axis) and the adjustment movement in the plane perpendicular to the Z-axis are absorbed by different fixing positions, so that the liquid crystal display element 4 (4a, 4b, 4c), the distance between the liquid crystal display element or the holding frame 3 (3a, 3b, 3c) and the intermediate member 2 (2a, 2b, 2c) and the distance between the intermediate member 2 and the composite prism 1 are almost changed. Since the adjustment allowance can be absorbed, the interval between the components can be set small in advance, and the amount of fixing material such as an adhesive filled therein can be reduced. For this reason, it is possible to perform highly accurate joining with reduced initial position displacement due to shrinkage of the fixing material and reduction with time due to release of residual stress.

  Conventionally, the distance between the liquid crystal display element or the holding frame and the intermediate member needs to be about 1 mm in consideration of the adjustment allowance of six axes, the tolerance of parts, and the like. By setting the distance between the fixed surfaces formed on the holding frame 3 and the intermediate member 2 to 0.1 to 0.3 mm as in the first embodiment, the component tolerance is absorbed, and the initial component deviation and the change with time. Can be reduced from 1/3 to 1/5.

  Moreover, as the first and second fixing materials, an adhesive is preferable, and among the adhesives, an ultraviolet curable resin that can easily control the start and speed of curing and has a short curing time is preferable. In addition, since the first and second fixing materials are adhesives, filled between members before adjustment, and cured after adjustment of the liquid crystal display element, it is possible to eliminate the influence of component deviation at the time of applying the fixing material. Therefore, the liquid crystal display element adjustment adhesion of the projection type display device with higher accuracy becomes possible.

FIG. 5 is an exploded perspective view showing a combining prism unit used in the projection display apparatus of Embodiment 2, and FIG. 6 is an exploded perspective view showing the combining prism unit for one color in FIG. is there.
The composite prism unit used in the projection display apparatus according to the second embodiment is different in the configuration of the holding frame 3 of the composite prism unit used in the first embodiment and the fixing portion of the intermediate member. That is, the three liquid crystal display elements 4 (4a, 4b, 4c) are fixed to the holding frame 3 (3a, 3b, 3c) with the screws 5 similarly to the first embodiment, and the holding frame 3 (3a, 3b, 3c) is fixed. The intermediate member 2 (2a, 2b, 2c) is fixed with a fixing material, but the intermediate member 2 (2a, 2b, 2c) and the composite prism 1 are conventionally used for fixing a liquid crystal display element. A pin-shaped protrusion is inserted into the center of the hole, and a fixing portion shape is used in which the space between the hole and the pin-shaped protrusion is filled with a fixing material and fixed. Even in the adjustment fixing configuration of the second embodiment, the size of the hole can be set as small as possible with respect to the diameter of the pin-shaped protrusion, so that the initial position shift of the component due to the shrinkage of the fixing material and the change over time due to the release of the residual stress. Reduced and highly accurate joining is possible.

  In addition, since the fixing material is fixed around the pin-shaped protrusion around the member with 360 degrees, the force acting between the members is balanced and offset by the shrinkage of the fixing material and the release of the residual stress. In addition to the effect of reducing the amount of the fixing material, it is possible to perform highly accurate joining with reduced initial component displacement and change with time. In the second embodiment, the holes are provided in the holding frame 3 and the pin-like protrusions are provided in the intermediate member 2. However, the holes may be provided in the intermediate member 2 and the pin-like protrusions may be provided in the holding frame 3. it can.

Next, a liquid crystal display element adjustment bonding method and a liquid crystal display element adjustment bonding apparatus for a projection display device will be described.
FIG. 7 is a front sectional view showing a state in which the liquid crystal display element is attached to the synthetic prism unit and adjusted using a conventional liquid crystal display element adjustment bonding apparatus.
In the adjustment process of attaching and fixing the liquid crystal display element to the combining prism of the projection display device using a conventional liquid crystal display element adjustment bonding apparatus, as shown in FIG. A component in a state where the member 2 (2a, 2b, 2c) is fixed to the composite prism 1 with the adhesives 6 ₁ , 6 _2, etc. is supplied to the composite prism gripping means 52 and the liquid crystal display elements 4 (4a, 4b, 4c) of RGB colors. ) Or a component obtained by attaching the holding frame 3 (3a, 3b, 3c) to the RGB liquid crystal display elements is set on the first gripping means 50 of the adjusting device. In this state, light 57 of each color of RGB is guided to the three liquid crystal display elements 4 to be adjusted through the mirror 56, and the respective adjustment images passing through the liquid crystal display element 4 are synthesized by the synthesis prism 1 and projected. An adjustment image projected on the screen 24 by the lens 23 is detected by the detection means 58.

The liquid crystal display element 4 for each color of RGB is moved in the focus (Z axis) direction, and the Z axis of the liquid crystal display element 4 is adjusted to a position where the focus characteristic at the center of the projection screen is the best. The best position of the focus characteristic is detected, for example, at a position where the contrast of the image becomes maximum when the liquid crystal display element 4 is moved in the Z-axis direction.
Next, the two tilt axes (α, β) of the liquid crystal display element 4 (4a, 4b, 4c) are adjusted so that the contrast difference between the images at the four corners of the projection screen is reduced.

Thereafter, pixel adjustment (convergence adjustment) of the liquid crystal display element 4 (4a, 4b, 4c) is performed, and the pixels of the R and B liquid crystal display elements 4b and 4c are defined on the basis of the pixel of the G liquid crystal display element 4a. Adjust the inner three axes (X, Y, θ). In this state, fixed by curing the intermediate member 2 and the liquid crystal display element 4 or sticking material ₆₁ filled between the holding frame 3 to the RGB colors. When the tilt 2 axis (α, β) and the focus 1 axis (Z axis) are adjusted, the liquid crystal display element 4 or the holding frame 3 moves substantially along the Z axis with respect to the intermediate member 2. When the in-plane three-axis (X, Y, θ) adjustment is performed, the movement is made along a plane perpendicular to the Z-axis. Therefore, if the 6-axis adjustment allowance is to be absorbed between the intermediate member 2 and the liquid crystal display element 4 or the holding frame 3, it is necessary to keep a wide space between the components of the fixing portion, and the adhesive to be filled, etc. The amount of the fixing materials 6 ₁ and 6 ₂ increases, and as a result, the initial position shift of the component due to curing shrinkage and the temporal change of the component position after the fixing material is cured increase. The detection adjustment image is detected by the detection means 58, and the first adjustment means 53 is controlled by the control device 59 comprising a computer to adjust the two tilt axes (α, β) and the focus one axis (Z axis). The second adjusting means 54 is controlled to perform in-plane three-axis (X, Y, θ) adjustment.

FIG. 8 is a front sectional view showing a state in which the liquid crystal display element is attached to the synthetic prism and adjusted using the liquid crystal display element adjustment bonding apparatus of the present invention.
As a configuration of the adjustment unit of the liquid crystal display element adjustment bonding apparatus according to the third embodiment, the liquid crystal display element 4 (4a, 4b, 4c) or the holding frame for holding the liquid crystal display element in the projection type display apparatus according to the first or second embodiment. 3 (3a, 3b, 3c), a first gripping means 50 for gripping the intermediate member 2 (2a, 2b, 2c), and a liquid crystal to which the first gripping means 50 is attached. The display element 4 or the holding frame 3 is tilted with respect to the synthetic prism 1 by an α-axis automatic stage 53a, a β-axis automatic stage 53b, and a Z-axis automatic stage 53c that adjust the two axes (α, β) and the focus one axis (Z axis). The constructed first adjusting means 53 and second holding means 51 are attached, and the liquid crystal display element 4 or the holding frame 3 and the intermediate member 2 are integrated into the in-plane three axes (X, Y, θ) θ-axis automatic stay to be adjusted 54a, the X-axis automatic stage 54b, and the Y-axis automatic stage 54c are provided with the second adjusting means 54, so that the intermediate member 2 pressed against the prism surface of the composite prism 1 with the fixing material interposed therebetween. The liquid crystal display element 4 or the holding frame 3 that holds the liquid crystal display element is adjusted by the first adjusting means 53 with respect to the two axes (α, β) and the focus one axis (Z axis). Pixel adjustment (convergence adjustment) of the display element can be performed by the second adjustment unit 54. Further, the first adjusting means 53 and the second adjusting means 54 can be integrated to perform coarse adjustment in the Z-axis direction with respect to the composite prism 1 by the Z-axis coarse movement stage 55.

The liquid crystal display element 4 or the holding frame 3 and the intermediate member 2 are integrally adjusted along the prism surface of the composite prism 1 by the second adjusting means 54 in the in-plane three axes (X, Y, θ). In addition, the shape of the fixing portion between the intermediate member 2 and the composite prism 1 is formed by a fixed surface parallel to the prism surface (along the in-plane three axes (X, Y, θ axes)). And the synthetic prism 1 can be fixed by surface bonding, and the amount of the _second fixing material 62 can be made thin and small.

Further, the volume of the _second fixing material 62 applied between the intermediate member 2 and the synthetic prism 1 is changed even if the in-plane three axes (X, Y, θ axes) along the prism surface are adjusted. It is possible to absorb the adjustment allowance of the in-plane three axes. Further, it is between the liquid crystal display element 4 or the holding frame 3 and the intermediate member 2, and it is sufficient to absorb only the adjustment allowance of the two axes (α, β) and the focus one axis (Z axis). Compared to absorption, the amount of the first and second fixing materials filled between the members can be reduced.

Further, the shape of the liquid crystal display element 4 or the fixing portion of the holding frame 3 and the intermediate member 2 is formed by a fixed surface having a mutually facing interval parallel to the focus axis (Z axis). Even if the tilt 2 axis (α, β) and the focus 1 axis (Z axis) are adjusted, the distance between the liquid crystal display element 4 or the holding frame 3 and the intermediate member 2 hardly changes. The spacing between members can be set so that the amount of ₁ is very small.

  Further, in the synthetic prism used in the projection display device, the holding frame 3 and the intermediate member 2 have positioning shapes that fit with the first and second gripping means of the adjustment bonding device for the liquid crystal display element, respectively. The positional relationship between the holding frame and the intermediate member and the first and second gripping means is determined with good reproducibility, and the positional relationship between the holding frame and the intermediate member is determined by the tolerances of the parts, so that the fixing member interval is kept in an optimal state. The liquid crystal display element can be adjusted and bonded with a fixing material. Therefore, it is possible to provide a projection display device that can set the amount of the fixing material extremely small, and can perform high-precision bonding with reduced displacement due to shrinkage of the fixing material and reduction with time due to release of residual stress. it can.

It is a top view which shows the optical system of the projection type display apparatus which this invention makes object. FIG. 2 is a perspective view illustrating a combining prism unit used in the projection display apparatus according to the first embodiment. FIG. 3 is an exploded perspective view illustrating a synthesis prism unit used in the projection display apparatus according to the first embodiment. FIG. 4 is an exploded perspective view illustrating a synthesis prism unit for one color in FIG. 3. It is a perspective view which decomposes | disassembles and shows the synthetic | combination prism unit used with the projection type display apparatus of Example 2. FIG. FIG. 6 is an exploded perspective view illustrating a synthesis prism unit for one color in FIG. 5. It is a front sectional view showing a state when a liquid crystal display element is attached to a synthetic prism and adjusted using a conventional liquid crystal display element adjustment device. It is a front sectional view showing a state when the liquid crystal display element is attached to a synthetic prism and adjusted using the liquid crystal display element adjustment bonding apparatus of the present invention.

Explanation of symbols

1 ... combination prism, 2 (2a, 2b, 2c ) ... intermediate member, 3 (3a, 3b, 3c ) ... holding frame, 4 (4a, 4b, 4c ) ... liquid crystal display device, 5 ... screw, ₆₁ ... first 1 fixing material, 6 ₂ ... second fixing material, 7 ... synthetic prism holder, 10 ... light source, 11 ... lens array, 12 ... collimator lens, 13, 15 ... dichroic mirror, 14, 17, 19 ... mirror, 16 , 18, 20, 21, 22 ... lenses, 23 ... projection lenses, 24 ... screen, 50 ... first gripping means, 51 ... second gripping means, 52 ... synthetic prism gripping means, 53 ... first adjusting means. 53a ... α-axis automatic stage, 53b ... β-axis automatic stage, 53c ... Z-axis automatic stage, 54 ... second adjusting means, 54a ... θ-axis automatic stage, 54b ... X-axis automatic stage, 54c ... Y-axis automatic stage 55 ... Axis coarse movement stage, 58 ... detection means, 59 ... controller.

Claims (11)

  The adjustment margin of the tilt axis 2 (α, β) and the focus 1 axis (Z axis) with respect to the composite prism of the liquid crystal display element or the holding frame holding the liquid crystal display element is set between the liquid crystal display element or the holding frame and the intermediate member. And the liquid crystal display element and the intermediate member are integrally adjusted in three in-plane axes (X, Y, θ) with respect to the synthetic prism, and the in-plane three-axis adjustment margin is adjusted. Is absorbed by a second fixing material between the intermediate member and the synthetic prism.   2. The projection display device according to claim 1, wherein the fixing portion of the liquid crystal display element or the holding frame and the intermediate member is formed by a fixed surface having a mutually opposed interval parallel to a focus axis (Z axis). A projection type display device characterized by that.   2. The projection display device according to claim 1, wherein a pin-like protrusion formed on the other fixed surface is inserted in a center of a hole formed on one fixed surface of the liquid crystal display element or the holding frame and the intermediate member. A projection type display device, wherein the first fixing material is filled and fixed between the hole and the pin-like projection.   4. The projection display device according to claim 2, wherein a distance between the fixed surfaces of the first fixing material is 0.1 to 0.3 mm.   The projection display device according to claim 1, wherein the fixing portion of the intermediate member with respect to the synthetic prism is formed by a fixed surface parallel to the synthetic prism surface.   6. The projection type display device according to claim 1, wherein the first fixing material and the second fixing material are adhesives.   A step of adjusting a liquid crystal display element or a holding frame for holding the liquid crystal display element with respect to an intermediate member abutting on the synthetic prism by adjusting two axes (α, β) and one focus axis (Z axis); And the intermediate member integrally with each other, the step of adjusting the in-plane three axes (X, Y, θ) with respect to the synthetic prism, and the liquid crystal display element or the holding frame and the intermediate member after the respective adjustment steps. And fixing the intermediate member and the synthetic prism with a second fixing material. A method for adjusting and adhering a liquid crystal display element of a projection display device, comprising: fixing the intermediate member and the synthetic prism with a second fixing material.   The liquid crystal display element adjustment bonding method for a projection display device according to claim 7, wherein the liquid crystal display element or a holding frame for holding the liquid crystal display element and a hole formed in one of the intermediate members and the other are formed. The liquid crystal display element or holding frame has two tilt axes (α, β) and a focus one axis (Z axis) with a pair of pinned protrusions and a pair of pinned protrusions inserted into the holes. A method for adjusting and adhering a liquid crystal display element of a projection display device, comprising adjusting and filling and fixing an adhesive between the hole and the pin-shaped protrusion.   The liquid crystal display element adjustment bonding method for a projection display device according to claim 8, wherein the two axes (α, β) and the focus one axis (Z axis) are adjusted, and the in-plane three axes (X, Y, θ). ) Before the adjusting step, the adhesive is filled between the liquid crystal display element or holding frame and the intermediate member and between the intermediate member and the synthetic prism, and is cured after adjustment of the liquid crystal display element. Liquid crystal display element adjustment adhesion method for projection display device.   A first holding means for holding a liquid crystal display element or a holding frame for holding the liquid crystal display element; a second holding means for holding an intermediate member; and the liquid crystal display element or holding frame to which the first holding means is attached Are attached to the liquid crystal display element or holding frame and the intermediate frame by a first adjusting means for adjusting the tilting two axes (α, β) and the focus one axis (Z axis) with respect to the composite prism. A liquid crystal display element adjusting and adhering device for a projection display device, comprising: a second adjusting unit that adjusts three in-plane axes (X, Y, and θ) with respect to the synthetic prism as a unit.   7. The projection display device according to claim 1, wherein the holding frame has a positioning shape that fits with the first gripping means, and the intermediate member fits with the second gripping means. A projection display device characterized by having a positioning shape.