JP3685074B2 - LCD projector - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a liquid crystal projector for enlarging and projecting images of liquid crystal panels, and more particularly to a mounting structure for a liquid crystal panel and a polarizing plate.
[0002]
[Prior art]
Conventionally, liquid crystal projectors for enlarging and projecting images on a liquid crystal panel using an ultra-high pressure mercury light source have been put on the market. In this case, light emitted from a light source is condensed on a liquid crystal panel via a plurality of mirrors and projected onto a screen through a projection lens. Recently, high brightness (light output of over 3000 ANSI lumens with 1.3 inch liquid crystal) and small liquid crystal panels such as 0.9-inch and 0.7-inch are available so that a projected image can be seen on a large screen even in a bright room. The ultra-compact projector used has also appeared.
[0003]
As a method of attaching these liquid crystal panels, for example, as shown in FIG. 4, the three liquid crystal panels 3 and the polarizing plates 51 and 56 arranged on the incident side and the emission side of the liquid crystal panel are at the center of the color synthesis optical portion. A structure in which the X prism 4 is fixed to the X prism 4 through a metal fitting 53 or the like from three sides and attached to an optical base 54 such as an AL die cast is generally used. Is provided in the illumination system unit 55, and the angle of the incident polarizing plate 56 is adjusted to an optimum position (a position where the contrast sinks most in all black display of each liquid crystal panel) in a state docked with the color composition system. Is common.
[0004]
[Problems to be solved by the invention]
However, in this case, the angle of each incident polarizing plate can be adjusted to the optimum position only in a state where the color synthesis system and the color separation system of the optical unit are integrally assembled, which takes man-hours. Further, when the liquid crystal panel is exchanged in the market or the like, it is necessary to adjust the polarizing plate again after docking with the illumination system, and it is necessary to install an adjusting device in each service station.
[0005]
In addition, the polarizing plate on the output side is often replaced with a light on the market because all the light becomes a heat component during black display and there is a problem with the durability of the polarizing plate. Therefore, the R, G, B convergence adjustment of the liquid crystal panel after the replacement cannot be performed in the market, and there is a loss that the main body cannot be replaced unless it is returned to the place where the production equipment is located.
[0006]
Therefore, at the time of exchanging the output side polarizing plate, the angle adjustment of the incident side polarizing plate is again performed for adjusting the contrast, so that the operation can be performed only in a state where the illumination system and the synthesis system are integrated.
The present invention solves the above problems and holds the polarizing plate and the liquid crystal panel. The incident side polarizing plate bracket for fixing the incident side polarizing plate is rotatably attached to the panel mounting member, and is fixed by UV curing after adjustment. Thus, the exit side polarizing plate is separably held on the junction base on the X prism, and provides a liquid crystal projector in which a color composition unit that can be removed from the upper part is realized with a simplified configuration.
[0007]
Therefore, the liquid crystal panel and the polarizing plate can be exchanged on the market with a simple jig. It is another object of the present invention to provide a configuration capable of automating contrast optimum position adjustment using only a color synthesis system without docking each illumination system.
[0008]
[Means for Solving the Problems]
In order to solve the above problems, a liquid crystal projector according to the present invention includes a lamp, color separation means for separating the lamp into red, blue, and green, three liquid crystal panel units that modulate each of the red, blue, and green light, and the liquid crystal. In order to synthesize the red, blue, and green light that passes through the panel unit, a prismatic glass is joined to the cloth, and an X-prism with a vapor-deposited film that transmits and reflects the red, green, and blue light on each surface and the combined light are expanded. A liquid crystal projector including a color combining optical unit integrally configured with a projection lens to project, and a main body case containing the lamp, the color separating unit, the color combining optical unit, and the like, above and below the X prism The joint base is integrally fixed, and the joint base has six projections provided in substantially the same shape, two on the surface to which each liquid crystal panel is attached, and the liquid crystal panel is fixed. A panel mounting member is fixed to the joining base with UV or solder in a state where each of the protrusions is inserted into the hole of the channel mounting member, and the incident side polarizing plate bracket for fixing the incident side polarizing plate is the panel mounting member. The output side polarizing plate is configured to be separably held by the bonding base .
[0010]
With the above configuration, the present invention develops production equipment that allows the angle adjustment of the incident-side polarizing plate to be performed in a state in which only the composite system unit is assembled, so that the contrast adjustment is automatically performed simultaneously with the convergence adjustment of the liquid crystal panel. A possible configuration can be provided. In addition, the angle adjustment can be manually performed only in a state where the illumination system is docked with the conventional illumination system, but the illumination system can be formed as a common jig.
[0011]
In addition, since the output side polarizing plate is separably held in the prism block, it is easy to replace the output polarizing plate that is frequently exchanged in the market, and if the liquid crystal panel mounting member and the fixing member are separated, the liquid crystal panel can be replaced. A liquid crystal projector having a configuration in which the convergence adjustment work can be performed with a simple jig even when there is a problem is obtained.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
According to a first aspect of the present invention, there is provided a lamp, color separation means for separating the lamp into red, blue, and green, three liquid crystal panel units that modulate each of the red, blue, and green light, and the red, blue, and green light that passes through the liquid crystal panel unit. In order to synthesize a prism, a prismatic glass is bonded to a cloth, and an X prism with a vapor deposition film that transmits and reflects red, green, and blue light on each surface and a projection lens that magnifies and projects the combined light are integrated. A liquid crystal projector comprising a color synthesizing optical means, and a main body case containing a lamp, a color separating means, a color synthesizing optical means, etc. Since the incident-side polarizing plate and the outgoing-side polarizing plate, which are independent from each other on the incident side and the outgoing side, are configured to be separable, the angle adjustment of the incident-side polarizing plate can be performed in a state in which only the synthesis unit is assembled, It made it possible to develop a production equipment that simultaneously contrast adjustment and convergence adjustment of crystal panels to work automatically.
[0013]
Further, when the angle is manually adjusted, it can be performed only in a state where it is docked with the conventional illumination system, but a liquid crystal projector capable of making the illumination system a common jig can be obtained.
[0014]
Further, in the second invention, the joining base is integrally fixed above and below the X prism, and the joining base has two projections provided with substantially the same shape, two on the surface to which each liquid crystal panel is attached. The panel mounting member is fixed to the bonding base with UV or solder with each projection inserted in the hole of the panel mounting member to which the liquid crystal panel is fixed, and the incident side for fixing the incident side polarizing plate The polarizing plate bracket is pivotably attached to the panel mounting member, and the output side polarizing plate is structured to be separably held on the joining base, so that it is easy to replace the output polarizing plate with a high replacement frequency in the market, and If the liquid crystal panel mounting member and the fixing member are separately provided, it is possible to obtain a liquid crystal projector having a configuration in which the convergence adjustment operation can be performed with a simple jig even when the liquid crystal panel is replaced.
[0015]
Hereinafter, liquid crystal projectors according to embodiments of the present invention will be described with reference to the drawings.
[0016]
(Embodiment 1)
1 is a perspective view showing a conceptual configuration of a liquid crystal projector in an embodiment of the present invention, FIG. 2 is a plan view showing details of the liquid crystal panel unit of FIG. 1, and FIG. 3 is a front view of FIG. FIG. 4 is a plan view of an optical unit to which a conventional incident polarizing plate and outgoing polarizing plate are attached.
[0017]
The main configuration of the three-plate liquid crystal projector optical system is as follows. The light from the lamp (light source) 1 is separated into red, green and blue using a plurality of mirrors 2 and is incident on the liquid crystal panel (unit) 3 as shown in FIG. In this method, the image is synthesized by the X prism 4 or the like and enlarged and projected by the projection lens 5 fixed to the lens mount or the like.
[0018]
Conventionally, three incident polarizing plates 56 are fixed to a unit 55 for separating this color, and the outgoing polarizing plate 51 is attached to a metal fitting for mounting a liquid crystal panel or the like.
[0019]
The liquid crystal panel unit 3 of the present invention will be described with reference to FIG. Three front and rear polarizing plates 11 and 12 on the front and rear sides of the three liquid crystal panels 10 are provided. By controlling the potential on and off of each pixel of the liquid crystal panel, all white, all black, Perform halftone light control. The light separated into R, G, and B by color separation optics passes through the output polarizing plate 12, and then four triangular prisms are bonded to each other, and R reflection, B reflection, and G transmission coating (vapor deposition) is applied to the interface. It is synthesized by an X prism 4 made of glass. The liquid crystal panel 10 is subjected to convergence adjustment for each pixel, and this is performed by an adjustable mechanical component and color synthesis is performed.
[0020]
Here, the liquid crystal panel unit and each polarizing plate are referred to as a color synthesis unit (the whole of FIG. 1). The color synthesis unit is fixed to the optical base 14 with upper and lower screws 40.
[0021]
The liquid crystal panel unit, the projection lens 5 and the color composition unit will be described in detail with reference to FIGS. Each liquid crystal panel 10 is fixed to the panel mounting bracket 15 with a plurality of screws. The panel mounting bracket 15 is detachably mounted on the panel holding bracket 24 with screws 27. Each incident polarizing plate 11 is bonded to the incident polarizing plate mounting bracket 16 and is rotatably held by four columns 17 standing on the panel holding member 24.
[0022]
The incident polarizing plate mounting bracket 16 is provided with a hole 16a that engages with a plurality of columns, and is prevented from being removed by a retaining pin 18, and after each incident polarizing plate mounting bracket 16 is rotated to a predetermined position described later, UV. It is fixed at a position 16b fixed by adhesion or the like. Similarly, the output side polarizing plate 12 is bonded to the output polarizing plate mounting bracket 19.
[0023]
In the X prism 4, a prism base 21 that is resin-molded up and down is integrated with screws 60 or the like. Next, attachment of the liquid crystal panel will be described. A prism base 21 fixed above and below the X prism is fixed with a joint base 23 having the same shape, and the joint base 23 is also provided with six protrusions 23a corresponding to the respective liquid crystal panels.
[0024]
The panel mounting bracket 15 is mounted with a panel holding member 24 with the upper part screwed in two (27 in the figure) and the lower part fitted with a slit-like hole 24a provided in the panel holding member 24. The panel holding member 24 is provided with four holes 24b corresponding to the two protrusions 23a of the upper and lower joining bases.
[0025]
From this protrusion, the hole 24b has a sufficient diameter in the front, rear, left and right, and is filled with solder, UV adhesive or the like and held by the upper and lower joining bases 23 as soon as the convergence adjustment of each liquid crystal panel is completed. In general, the convergence is adjusted by 6-axis adjustment (moving and rotating the X, Y, and Z axes) by capturing the pixels of the liquid crystal panels R, G, and B with a camera while viewing the projection screen (details are omitted). Therefore, the liquid crystal panel 10 and the X prism 4 are firmly integrated by the panel holding member 24 and the upper and lower joining bases 23.
[0026]
The L-shaped output polarizing plate mounting bracket 19 is fixed to the prism base 21 with a fixing screw 30. If the screw is removed, the output polarizing plate 12 can be pulled up with the take-out knob portion 19a. is there. Therefore, even when the output polarizing plate 12 is deteriorated, the set can be replaced without greatly disassembling.
[0027]
The projection lens 5 is attached to the other surface of the optical base in parallel to the X prism and the optical axis direction (the mounting screw portion is omitted). In general, the G of the liquid crystal panel and the optical axis of the projection lens 5 are perpendicular, and the convergence adjustment of the R and B liquid crystal panels is performed as described above with reference to the G panel. Therefore, the projection lens, the optical base, the X prism, and the liquid crystal panel are made into one block.
[0028]
This block is fixed to the illumination system block for color separation by screwing from above into a hole 61 in the figure with a screw or the like. Therefore, it becomes easy to remove only this block to the upper part without disassembling the set. On the other hand, when repairing (maintenance) the liquid crystal panel and the input / output polarizing plate, the block is first removed. In this state, the incident and output polarizing plates, the liquid crystal panel, and components for attaching them are separated from the illumination system.
[0029]
For example, when replacing the liquid crystal panel, the panel holding member cannot be removed because it is fixed to the joining base with a UV adhesive or the like, but the panel mounting bracket can be easily moved by removing the two screws. The panel mounting bracket is provided with a plurality of protrusions on the upper portion, and a member having a function for moving the bracket in the X, Y, Z axis and its rotating direction is inserted therein.
[0030]
Although details of the function are omitted here, it is only necessary to devise a jig for moving each panel mounting bracket while the jig is fixed by the positioning hole 62 used in the optical base. When the liquid crystal panel or the output polarizing plate is replaced, the angle adjustment of the incident polarizing plate can be performed by taking out only this block.
[0031]
【The invention's effect】
As described above, according to the present invention, an incident polarizing plate, an outgoing polarizing plate, a liquid crystal panel, an X prism, and a projection lens can be integrated to be independent of an illumination system as a color synthesis block. Therefore, it becomes easy to combine and produce the incident polarizing plate and the liquid crystal panel in assembly. For example, if the rank of the liquid crystal panel is A, B, C, the specification of the polarizing plate can also be changed little by little according to that, and as a result, the incident polarizing plate having the optimum contrast ratio for the liquid crystal And easy docking production.
[0032]
In addition, when the polarizing plate or the liquid crystal panel is exchanged on the market, the incident side polarizing plate and the outgoing side polarizing plate are held separately on the incident side and the outgoing side, respectively, so that the angle adjustment of the incident side polarizing plate can be performed. It is also possible to develop a production facility that can be performed in the state where only the synthesis unit is assembled, and that the contrast adjustment is automatically performed simultaneously with the convergence adjustment of the liquid crystal panel.
[0033]
In addition, the angle adjustment can be manually performed only in a state where it is docked with the conventional illumination system, but it is possible to obtain a liquid crystal projector that can be performed only by the synthesis system by making the illumination system a common jig. . Furthermore, it is possible to obtain a liquid crystal projector that can be operated without removing other components from the upper part of the main body when the polarizing plate deteriorates due to higher brightness in the future.
[Brief description of the drawings]
1 is a perspective view showing a concept of a liquid crystal projector color synthesis system in an embodiment of the present invention. FIG. 2 is a plan view showing details of a liquid crystal panel unit in FIG. 1. FIG. 3 is a front view of FIG. With the removed)
FIG. 4 is a perspective view of a main part showing an entire conventional liquid crystal projector.
DESCRIPTION OF SYMBOLS 1 Lamp 2 Mirror 4 X prism 5 Projection lens 10 Liquid crystal panel 11 Incident polarizing plate 12 Outgoing polarizing plate 14 Optical base 15 Panel mounting bracket 16 Incident polarizing plate mounting bracket 17 Strut 19 Outgoing polarizing plate mounting bracket 21 Prism stand 22 Liquid crystal panel 23 Joining Base 24 Panel holding member

Claims (1)

A lamp,
Color separation means for separating the lamp into red, blue and green;
Three liquid crystal panel units that modulate each of the red, blue, and green light, and a triangular prismatic glass are joined to each other to synthesize the red, blue, and green light that passes through the liquid crystal panel unit, and each surface transmits red, green, and blue light. Color synthesizing optical means in which an X prism provided with a vapor deposition film for reflection and a projection lens for enlarging and projecting the synthesized light are integrally formed;
A liquid crystal projector comprising a main body case containing the lamp, the color separation means, the color synthesis optical means, and the like;
Bonding bases are fixed integrally on the top and bottom of the X prism, and the bonding base has six protrusions provided in substantially the same shape, two on the surface to which each liquid crystal panel is attached,
The panel mounting member is fixed to the joining base with UV or solder in a state in which each projection is inserted into the hole of the panel mounting member to which the liquid crystal panel is fixed,
The incident-side polarizing plate bracket for fixing the incident-side polarizing plate is rotatably attached to the panel mounting member.
The exit-side polarizing plate is configured to be separably held by the bonding base .

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