JP2012123225A - Projector and control method therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a projector which can compensate for color coordinate deviations associated with changes in a ray angle, and a control method therefor.SOLUTION: Based on the detection result of a lens information detector 95, arrangement of a color filter 31 is adjusted. Therefore, if changes of a projector lens 71 causes variations of the color coordinates, the color filter 31 can be adjusted so as to cancel the variations, which can provide a projector 100 capable of projecting an excellent image regardless of changes of the projector lens 71.

Description

  The present invention relates to a projector that modulates and projects light emitted from a light source and a control method therefor.

  In a projector that modulates light emitted from a light source and projects it from a projection lens, a projector is proposed that includes a diaphragm mechanism in the projection lens and improves the contrast by narrowing the diaphragm (for example, see Patent Document 1). Yes.

JP-A-2005-106907

  However, the projector as described above has a problem that the color coordinate of the projection light is shifted because the distribution of the light beam angle included in the projection light changes with the change of the stop. Further, when the projector includes a zoom mechanism, the distribution of the light beam angle changes with a change in zoom state, that is, a change in projection magnification. In addition, when the projector includes a lens shift mechanism that moves the projection lens in a direction perpendicular to the optical axis in order to adjust the projection position of the image, the light beam angle depends on the lens shift amount, that is, the movement amount of the projection lens. The distribution of changes. For this reason, a projector capable of correcting a color coordinate shift accompanying a change in the light beam angle is desired.

  SUMMARY An advantage of some aspects of the invention is to solve at least a part of the problems described above, and the invention can be implemented as the following forms or application examples.

  Application Example 1 A projector according to this application example includes a light source, a light modulation unit that modulates light emitted from the light source, a color filter disposed between the light source and the light modulation unit, A projection optical system that projects light modulated by the light modulation unit; and an adjustment unit that adjusts an arrangement angle of the color filter based on an adjustment state related to an angle of light projected from the projection optical system. It is characterized by that.

  According to this application example, since the arrangement angle of the color filter is adjusted based on the adjustment state related to the angle of light projected from the projection optical system, even when adjustment is performed in which the angle of light projected is changed, By adjusting the arrangement angle of the color filter so as to cancel the change in the color coordinate accompanying this, the color coordinate can be maintained, and a projector capable of projecting a good image on the screen can be provided.

  Application Example 2 In the projector according to the application example, it is preferable that the adjustment state includes at least one of an aperture value, a projection magnification, and a lens shift amount of the projection optical system.

  According to this application example, the color coordinates can be maintained even when the adjustment state of the aperture value, the projection magnification, or the lens shift amount of the projection optical system changes.

  Application Example 3 In the projector according to the application example described above, the projector further includes a light control device that is disposed between the light source and the light modulation unit, and controls light by shielding a part of the light emitted from the light source. The adjustment state preferably includes the dimming state of the dimming device.

  According to this application example, the color coordinates can be maintained even when the dimming state of the dimming device changes.

  Application Example 4 In the projector according to the application example described above, the projector may further include a detection unit that detects the adjustment state, and the adjustment unit may adjust the arrangement angle of the color filter based on a detection result of the detection unit. desirable.

  Application Example 5 A projector control method according to this application example is a projector control method in which light emitted from a light source is modulated by a light modulation unit and projected from a projection optical system, and is projected from the projection optical system. The arrangement angle of the color filter arranged between the light source and the light modulation unit is adjusted based on the adjustment state related to the angle of the light to be emitted.

  According to this application example, since the arrangement angle of the color filter is adjusted based on the adjustment state related to the angle of light projected from the projection optical system, even when adjustment is performed in which the angle of light projected is changed, By adjusting the arrangement angle of the color filter so as to cancel the change in the color coordinate accompanying this, the color coordinate can be maintained and a good image can be projected on the screen.

1 is a diagram conceptually illustrating a projector according to a first embodiment. 2 is a flowchart for explaining the operation of the projector shown in FIG. It is a figure which shows notionally the projector which concerns on 2nd Embodiment. 4 is a flowchart for explaining the operation of the projector shown in FIG. 3.

[First Embodiment]
The projector according to the first embodiment of the present invention will be described below with reference to FIG. The illustrated projector 100 includes an optical system portion 10 for image formation and projection, and a control device 90 that controls the operation of the optical system portion 10.

[1. Projector optics)
The optical system portion 10 shown in FIG. 1 includes an illumination optical system 20 that emits illumination light, a color separation light guide optical system 40 that separates illumination light from the illumination optical system 20 into three color lights of blue, green, and red, and a color A light modulating unit 50 that modulates the three color lights emitted from the separation light guide optical system 40 according to image information, a light combining optical system 60 that combines the image light of each color emitted from the light modulating unit 50, and light combining A projection optical system that projects the image light combined by the optical system 60 onto a screen (not shown). Among these, the light modulation unit 50 and the light combining optical system 60 constitute a display device 81 for modulating illumination light to form an image. The parts from the illumination optical system 20 to the light combining optical system 60 are accommodated in the optical component casing 10a.

  In the present embodiment, the optical axis of the illumination optical system 20 and the optical axis of the projection optical system 70 are orthogonal to each other, and the direction parallel to the optical axis of the illumination optical system 20 is the X direction (the light emission direction is + X Direction), and the direction parallel to the optical axis of the projection optical system 70 is defined as the Z direction (the light emission direction is the + Z direction). A direction perpendicular to both the optical axis of the illumination optical system 20 and the optical axis of the projection optical system 70 is defined as a Y direction.

  The illumination optical system 20 includes a light source device 21, a concave lens 22, first and second lens arrays 24 and 25, a polarization conversion device 26, a superimposing lens 27, and a color filter 31. Among these, the light source device 21 is a light source that emits a light beam for illumination. For example, an arc tube 21a such as a high-pressure mercury lamp, and an elliptical surface type that collects the light beam emitted from the arc tube 21a and emits it forward. And a concave mirror 21b. The concave lens 22 has a role of collimating the light beam from the light source device 21, but may be omitted when the concave mirror 21b is a parabolic mirror, for example. The first and second lens arrays 24 and 25 are fly-eye lenses each composed of a plurality of element lenses arranged in a matrix. Among these, the light beam emitted from the light source device 21 is divided into a plurality of partial light beams by the element lenses constituting the first lens array 24. In addition, each partial light beam from the first lens array 24 is emitted at an appropriate divergence angle by the element lenses constituting the second lens array 25. The polarization conversion device 26 is composed of a prism array incorporating a PBS (Polarization beam splitter) and a wave plate, and converts the divided light beam emitted from the second lens array 25 into only linearly polarized light in a specific direction, and the next stage optical system. This is a polarization conversion unit supplied to the system. The superimposing lens 27 appropriately superimposes the illumination light as linearly polarized light that has passed through the polarization converter 26 as a whole, thereby superimposing illumination on the liquid crystal light valves 50r, 50g, and 50b of the respective colors provided in the illuminated region, that is, the light modulation unit 50. Enable. In other words, the illumination light that has passed through both the lens arrays 24 and 25 and the superimposing lens 27 passes through the color separation light guide optical system 40 described in detail below, and each color liquid crystal panel 51r, provided in the light modulation unit 50. 51g and 51b are uniformly superimposed and illuminated. The color filter 31 is disposed between the first lens array 24 and the second lens array 25. The color filter 31 is an optical filter in which a thin film is formed on the surface of a transparent substrate, and corrects the color of illumination light by absorbing or reflecting light in a specific wavelength range and transmitting light in other wavelength ranges. . The projector 100 according to the present embodiment also has a function (color coordinate compensation function) for compensating the color coordinates of the image projected on the screen by adjusting the arrangement angle of the color filter 31. Will be described later.

  The color separation light guide optical system 40 includes first and second dichroic mirrors 41a and 41b, reflection mirrors 42a, 42b, and 42c, and three field lenses 43r, 43g, and 43b. Is separated into three colors of red (R), green (G), and blue (B), and the separated color lights are transmitted to the liquid crystal light valves 50r, 50g, and 50b at the subsequent stage. Lead. More specifically, first, the first dichroic mirror 41a reflects the R illumination light LR out of the three colors RGB in the + Z direction and transmits the G and B illumination lights LG and LB. The reflection mirror 42a reflects the illumination light LR reflected by the first dichroic mirror 41a in the + X direction. The second dichroic mirror 41b reflects the G illumination light LG of the two colors GB in the + Z direction and transmits the B illumination light LB. The reflection mirror 42b reflects the illumination light LB transmitted through the second dichroic mirror 41b in the + Z direction, and the reflection mirror 42c reflects the illumination light LB in the -X direction. That is, the red light LR reflected by the first dichroic mirror 41a is guided to the first optical path OP1 with the field lens 43r, is transmitted through the first dichroic mirror 41a, and is reflected by the second dichroic mirror 41b. The green light LG is guided to the second optical path OP2 having the field lens 43g, and the blue light LB having passed through the second dichroic mirror 41b is guided to the third optical path OP3 having the field lens 43b. The field lenses 43r, 43g, and 43b for the respective colors are set so that each partial light beam emitted from the second lens array 25 has an appropriate incident angle on the irradiated area of each liquid crystal light valve 50r, 50g, and 50b. It is adjusting. The pair of relay lenses 44a and 44b are disposed on a third optical path OP3 that is relatively longer than the first optical path OP1 and the second optical path OP2, and an image formed immediately before the incident-side relay lens 44a is almost unchanged. By transmitting the light to the field lens 43b on the emission side, the light use efficiency is prevented from being lowered due to light diffusion or the like.

  The light modulation unit 50 includes three liquid crystal light valves 50r, 50g, and 50b into which illumination lights LR, LG, and LB of three colors are incident, respectively. Each of the liquid crystal light valves 50r, 50g, and 50b is a non-light-emitting light modulator that modulates the spatial distribution of the intensity of incident illumination light.

  Each of the liquid crystal light valves 50r, 50g, 50b includes a liquid crystal panel 51r, 51g, 51b disposed in the center, and an incident side polarizing filter 52r, 52g, 52b disposed on one light incident side so as to sandwich the liquid crystal panel 51r, 51g, 51b. Emission side polarization filters 53r, 53g, and 53b are provided on the other light emission side, respectively. The liquid crystal panels 51r, 51g, and 51b are not shown in the drawings, but a light-transmitting substrate having a transparent electrode or the like, a light-transmitting driving substrate having a pixel electrode or the like, and between the light-transmitting substrate and the driving substrate And a liquid crystal layer hermetically sealed. The color lights LR, LG, LB incident on the liquid crystal light valves 50r, 50g, 50b are in units of pixels in accordance with the drive signals or image signals input as electrical signals to the liquid crystal light valves 50r, 50g, 50b. Intensity modulated.

  The light combining optical system 60 is a cross dichroic prism, has a substantially square shape in plan view in which four right angle prisms are bonded together, and a pair of dichroic mirrors 61 intersecting in an X shape at the interface where the right angle prisms are bonded together. , 62 are formed. Both dichroic mirrors 61 and 62 are formed of dielectric multilayer films having different characteristics. That is, one first dichroic mirror 61 reflects red light LR, and the other second dichroic mirror 62 reflects blue light LB. The light combining optical system 60 reflects the modulated red light LR from the liquid crystal light valve 50r by the first dichroic mirror 61 and emits it in the + Z direction by bending the optical path, and the modulated green light from the liquid crystal light valve 50g. The light LG is transmitted through the first and second dichroic mirrors 61 and 62 so as to travel straight in the + Z direction, and the modulated blue light LB from the liquid crystal light valve 50b is reflected by the second dichroic mirror 62 to bend the optical path. To inject in the + Z direction. On the light emitting side of the light combining optical system 60, the color lights LR, LG, and LB are superimposed to perform color combining.

  The projection optical system 70 includes a projection lens 71 that enlarges and projects the color image light combined by the light combining optical system 60. The projection lens 71 projects images on the liquid crystal panels 51r, 51g, and 51b onto a screen (not shown). The projection optical system 70 also adjusts the amount of light to improve the contrast, the zoom mechanism to adjust the projection magnification, and the projection lens 71 to move in the direction perpendicular to the optical axis to adjust the image projection position. A lens shift mechanism (not shown) is provided, and the user can perform these adjustments manually or electrically. Furthermore, the projection optical system 70 includes a sensor 72 as a detection unit that detects various adjustment states of the projection lens 71, that is, an aperture value, a projection magnification, and a lens shift amount (amount of movement of the projection lens 71). 72, that is, information including the detected aperture value, projection magnification, and lens shift amount (hereinafter referred to as “lens information”) is output to a lens information detection unit 95 described later. The projection optical system 70 projects a color moving image or a color still image obtained by synthesizing each color image corresponding to the drive signal or image signal input to each liquid crystal panel 51r, 51g, 51b on the screen at a desired magnification.

Hereinafter, the color coordinate compensation function by the color filter 31 will be described.
The first and second dichroic mirrors 41a and 41b control the spectral characteristics of transmitted light and reflected light using light interference by the thin film, and reflect or transmit light in the thin film when the incident angle changes. Since the optical path length changes, the spectral characteristics change. For this reason, each color light separated by the first and second dichroic mirrors 41a and 41b includes light whose wavelength band is slightly shifted according to the incident angle. Here, when the aperture value, the projection magnification, or the lens shift amount of the projection lens 71 changes, the angle distribution of the projected light beam, that is, the light beam that reaches the screen changes, so that it is projected on the screen as a result. The color coordinates of the image to be changed.

  The color filter 31 is configured to be rotatable about an axis perpendicular to the traveling direction of light (X direction) (in this embodiment, an axis parallel to the Y direction) as a rotation axis, and its rotation angle (arrangement angle). Can be controlled. In addition, the color filter 31 also changes the spectral characteristics depending on the incident angle of the light beam, similarly to the first and second dichroic mirrors 41a and 41b, and therefore changes in the aperture value, projection magnification, and lens shift amount of the projection lens 71. Correspondingly, by correcting (adjusting) the arrangement angle of the color filter 31, changes in the color coordinates of the image projected on the screen can be suppressed.

[2. Projector control system)
As shown in FIG. 1, the control device 90 drives the liquid crystal light valves 50 r, 50 g, and 50 b based on the image processing unit 91 to which an external image signal such as a video signal is input and the output of the image processing unit 91. A panel driving unit 92, a color filter adjusting unit 93 that adjusts the arrangement angle of the color filter 31, a lighting driving unit 94 that supplies power to the light source device 21 to adjust the lighting state of the arc tube 21a, and a lens of the projection optical system 70 A lens information detection unit 95 for detecting information, and a main control unit 99 for comprehensively controlling the operations of these circuit portions 91, 93, 94, 95 and the like are provided. The control device 90 operates by receiving power from the power supply device 101.

  In the control device 90, the image processing unit 91 can perform color correction, distortion correction, or the like on the input external image signal, or display character information or the like instead of or superimposing the external image signal. .

  The panel drive unit 92 generates a drive signal for adjusting the state of each of the liquid crystal light valves 50r, 50g, and 50b based on the image signal after image processing output from the image processing unit 91. Accordingly, an image as a transmittance distribution can be formed in the liquid crystal light valves 50r, 50g, and 50b corresponding to the image signal input from the image processing unit 91.

  The color filter adjustment unit 93 drives the color filter 31 based on the control of the main control unit 99 and adjusts the arrangement angle of the color filter 31.

  The lighting drive unit 94 adjusts the light emission state of the arc tube 21a by adjusting the voltage and current amplitude and period supplied to the arc tube 21a.

  The lens information detection unit 95 receives lens information of the projection lens 71 from the projection optical system 70 and outputs it to the main control unit 99.

  The main control unit 99 includes a microcomputer, a memory, and the like, and operates based on a program appropriately prepared for controlling the image processing unit 91, the color filter adjustment unit 93, the lighting drive unit 94, the lens information detection unit 95, and the like. To do. Thereby, the operation state of the projector 100 is appropriately maintained. In this embodiment, the main control unit 99 receives lens information such as the aperture value, projection magnification, and lens shift amount of the projection lens 71 via the lens information detection unit 95, and compensates the color coordinates based on this lens information. Control information is derived and output to the color filter adjustment unit 93. This control information is information for designating the arrangement angle of the color filter 31, and the color filter adjustment unit 93 compensates the color coordinates by rotating the color filter 31 so that the arrangement angle is based on this control information. To do. The main control unit 99 stores a conversion table and conversion formula necessary for deriving control information from lens information in a nonvolatile memory.

[3. (Color coordinate compensation operation)
Hereinafter, the color coordinate compensation operation in the projector 100 of the present embodiment will be described with reference to the flowchart of FIG.

  First, the projector 100 performs image signal display processing (step S10). That is, when a video signal is input to the control device 90 via the image signal input terminal, the main control unit 99 operates the image processing unit 91 to cause the liquid crystal light valves 50r, 50g, and 50b to respond to the video signal. Light modulation is performed.

  Next, the sensor 72 of the projection optical system 70 detects various adjustment states (aperture value, projection magnification, lens shift amount) of the projection lens 71, and the lens information that is the detection result is passed through the lens information detection unit 95. To the main control unit 99 (step S11).

  Next, the main control unit 99 applies the lens information obtained in step S11 to the conversion table and conversion formula described above, and derives control information for compensating the color coordinates. (Step S12).

  Next, the main control unit 99 outputs the control information to the color filter adjustment unit 93, thereby adjusting the arrangement angle of the color filter 31 and performing color coordinate compensation (step S13).

  The main control unit 99 returns to step S10 after the operation in step S13 (N in step S14) until the end of the projection operation is instructed by turning off the power or the like (Y in step S14).

  According to the projector 100 described above, since the arrangement angle of the color filter 31 is adjusted based on the lens information of the projection lens 71, the color coordinates are changed by the change in the aperture value, the projection magnification, and the lens shift amount of the projection lens 71. Even in this case, it is possible to adjust the color filter 31 so as to cancel this, and to provide a projector 100 capable of projecting a good image regardless of changes in the aperture value, projection magnification, and lens shift amount of the projection lens 71. Can do.

[Second Embodiment]
Hereinafter, the configuration of the optical system of the projector according to the second embodiment will be described. The projector according to the second embodiment is a modification of the projector 100 according to the first embodiment, and portions that are not particularly described are the same as those in the first embodiment.

FIG. 3 is a conceptual diagram of a projector 200 according to the second embodiment.
As shown in FIG. 3, in the projector 200 of the present embodiment, a light control device 32 is disposed between the first lens array 24 and the second lens array 25 of the illumination optical system 20. The light control device 32 shields a part of the illumination light with an opening and closing louver and adjusts (light control) the amount of light incident on the liquid crystal light valves 50r, 50g, 50b. It is possible to adjust continuously or stepwise between the most open states.

  The control device 90 includes a dimming drive unit 96 that drives the dimming device 32 based on the control of the main control unit 99. Then, the main control unit 99 acquires information about the brightness of the projected image from the image processing unit 91 in units of frames, and instructs the dimming drive unit 96 to drive the dimming device 32 according to the brightness of the image. To do. Specifically, the brighter the image to be projected, the more the light amount is increased by opening the dimmer 32, and the lower the light amount by closing the dimmer 32 as the projected image is dark, thereby reducing the contrast. Improve.

  Similar to the first embodiment, a color filter 31 whose arrangement angle can be adjusted is arranged between the first lens array 24 and the second lens array 25 on the emission side of the light control device 32. .

Hereinafter, the color coordinate compensation function of the color filter 31 will be described.
When the light control device 32 changes the open / close state (light control state), the angle component of the light changes, and as a result, the color coordinates of the image projected on the screen change. Here, by changing the arrangement angle of the color filter 31 corresponding to the open / closed state of the light control device 32, it is possible to suppress changes in the color coordinates. The non-volatile memory of the main control unit 99 stores a conversion table or conversion formula in which the open / closed state of the light control device 32 is associated with control information for compensating the color coordinates.

  FIG. 4 is a flowchart for explaining the operation of the projector 200 according to the second embodiment.

  First, the projector 200 performs image signal display processing (step S20). That is, when a video signal is input to the control device 90 via the image signal input terminal, the main control unit 99 operates the image processing unit 91 to cause the liquid crystal light valves 50r, 50g, and 50b to respond to the video signal. Light modulation is performed.

  Next, the main control unit 99 controls the light control device 32. That is, information about the brightness of the image to be projected is acquired from the image processing unit 91, and the dimming drive unit 96 is caused to change the open / close state of the dimming device 32 (step S21).

  Next, the main control unit 99 uses the conversion table and conversion formula described above to obtain corresponding control information, that is, control information for compensating the color coordinates, from the open / closed state of the light control device 32 controlled in step S21. To derive. (Step S22).

  Next, the main control unit 99 outputs the control information to the color filter adjustment unit 93 to adjust the arrangement angle of the color filter 31 and perform color coordinate compensation (step S23).

  The main control unit 99 returns to step S20 after the operation in step S23 (N in step S24) until the end of the projection operation is instructed by turning off the power or the like (Y in step S24).

  According to the projector 200 described above, the color filter adjustment unit 93 adjusts the arrangement angle of the color filter 31 based on the open / closed state (light control state) of the light control device 32, so that the color coordinates are changed by the light control device 32. In this case, the color filter 31 can be adjusted so as to cancel this, and the projector 200 that can project a good image regardless of the environmental change can be provided.

[Modification]
In addition, you may change the said embodiment as follows.

  In the embodiment described above, a high-pressure mercury lamp is used as the arc tube 21a of the light source device 21 provided in the illumination optical system 20, but various light sources such as a metal halide lamp can be used as the arc tube 21a.

  In the above embodiment, a pair of lens arrays 24 and 25 is used to divide the light from the light source device 21 into a plurality of partial light beams. However, the present invention does not use such lens arrays 24 and 25. It is also applicable to. Furthermore, the lens arrays 24 and 25 can be replaced with rod integrators.

  In the above embodiment, the polarization conversion device 26 that converts the light from the light source device 21 or the like into polarized light in a specific direction is used. However, the present invention is also applicable to a projector that does not use such a polarization conversion device 26. .

  In the above embodiment, an example in which the present invention is applied to the projectors 100 and 200 including the transmissive liquid crystal light valves 50r, 50g, and 50b has been described. However, the present invention is applied to a projector including the reflective liquid crystal light valve. Can also be applied. Here, “transmission type” means that a liquid crystal light valve including a liquid crystal panel transmits light, and “reflection type” means that the liquid crystal light valve reflects light. It means that there is.

  As the projector, there are a front projection type projector that projects an image from the direction of observing the projection surface and a rear projection type projector that projects an image from the side opposite to the direction of observing the projection surface. The configurations of the projectors 100 and 200 shown in FIG. 3 are applicable to both.

  In the above embodiment, only the examples of the projectors 100 and 200 using the three liquid crystal light valves 50r, 50g, and 50b have been described. However, the present invention may include four or more projectors using one or two liquid crystal light valves. It can also be applied to projectors using liquid crystal light valves. When a projector is configured with a single liquid crystal light valve, this liquid crystal light valve serves as a display unit.

  In the above embodiment, a color image is formed using the color separation light guide optical system 40, the liquid crystal light valves 50r, 50g, 50b, etc., but instead, for example, a color wheel illuminated by the light source device 21 And a device (light valve) composed of a number of micromirror pixels may be combined, and the light transmitted through the color wheel may be reflected by the micromirror to form an image.

  In the above embodiment, when the aperture value, the projection magnification, and the lens shift amount of the projection lens 71 are electrically adjusted, a driving unit that drives the aperture mechanism, the zoom mechanism, and the lens shift mechanism based on the control of the main control unit 99. May be provided in the control device 90.

  In the embodiment described above, the color filter 31 is disposed between the first and second lens arrays 24 and 25. However, as long as it is between the light source device 21 and the liquid crystal light valves 50r, 50g, and 50b, other color filters 31 are provided. It can also be placed in position.

  In the above embodiment, the color filter 31 controls the arrangement angle with an axis parallel to the Y direction as the rotation axis. However, if the rotation axis is an axis perpendicular to the light traveling direction (X direction), It is not limited to an axis parallel to the Y direction. For example, the arrangement angle can be controlled using an axis parallel to the Z direction as a rotation axis.

  In the above-described embodiment, an example in which the arrangement angle of the color filter 31 is adjusted at the time of color coordinate compensation has been described. Instead, for example, the same effect can be obtained by adjusting the arrangement angle of the dichroic mirrors 41a and 41b. Obtainable. In this case, the dichroic mirrors 41a and 41b correspond to color filters.

  In the above-described embodiment, the aspect in which the arrangement angle of the color filter 31 is adjusted based on all of the aperture value, the projection magnification, and the lens shift amount of the projection lens 71 has been described, but the aspect in which adjustment is performed based on at least one of these. If it is.

  DESCRIPTION OF SYMBOLS 10 ... Optical system part, 10a ... Housing for optical components, 20 ... Illumination optical system, 21 ... Light source device, 21a ... Light emitting tube, 21b ... Concave mirror, 22 ... Concave lens, 24 ... First lens array, 25 ... Second 26 ... Polarization conversion device, 27 ... Superimposing lens, 31 ... Color filter, 32 ... Light control device, 40 ... Color separation light guide optical system, 41a ... First dichroic mirror, 41b ... Second dichroic mirror 42a, 42b, 42c ... reflective mirror, 43r, 43g, 43b ... field lens, 44a, 44b ... relay lens, 50 ... light modulator, 50r, 50g, 50b ... liquid crystal light valve, 51r, 51g, 51b ... liquid crystal panel 52r, 52g, 52b... Entrance side polarization filter, 53r, 53g, 53b... Exit side polarization filter, 60. DESCRIPTION OF SYMBOLS 1st dichroic mirror, 62 ... 2nd dichroic mirror, 70 ... Projection optical system, 71 ... Projection lens, 72 ... Sensor, 81 ... Display apparatus, 90 ... Control apparatus, 91 ... Image processing part, 92 ... Panel drive part, 93 ... Color filter adjustment unit, 94 ... Lighting drive unit, 95 ... Lens information detection unit, 96 ... Dimming drive unit, 99 ... Main control unit, 100, 200 ... Projector, 101 ... Power supply device, OP1 ... First optical path, OP2 ... second optical path, OP3 ... third optical path.

Claims (5)

A light source;
A light modulation unit that modulates light emitted from the light source;
A color filter disposed between the light source and the light modulator;
A projection optical system for projecting the light modulated by the light modulator;
An adjustment unit that adjusts an arrangement angle of the color filter based on an adjustment state related to an angle of light projected from the projection optical system;
A projector comprising:   The projector according to claim 1, wherein the adjustment state includes at least one of an aperture value, a projection magnification, and a lens shift amount of the projection optical system. A light control device that is disposed between the light source and the light modulation unit and that controls light by shielding a part of the light emitted from the light source;
The projector according to claim 1, wherein the adjustment state includes a light control state of the light control device. A detector for detecting the adjustment state;
The projector according to claim 1, wherein the adjustment unit adjusts an arrangement angle of the color filter based on a detection result of the detection unit. A method for controlling a projector that modulates light emitted from a light source with a light modulation unit and projects the light from a projection optical system,
A projector control method for adjusting an arrangement angle of a color filter arranged between the light source and the light modulation unit based on an adjustment state relating to an angle of light projected from the projection optical system.

Images