JP2016080817A - Projection type display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a projection type display device that can further suppress color shift.SOLUTION: A projector 100 includes a 1/4 wavelength plate 104 on which light beams from a liquid crystal panel 101 are made incident, and a wavelength plate holder 105 that holds the 1/4 wavelength plate 104. The 1/4 wavelength plate 104 can rotate on a cross section parallel to the normal of the liquid crystal panel 101.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a projection display device such as a projector using a liquid crystal panel.

  In recent years, in projectors using a plurality of liquid crystal panels, the pitch of panel pixels has become smaller with the increase in the number of pixels and the cost of the liquid crystal panels. For example, if a WUXGA video format can be displayed on a 0.7-inch diagonal liquid crystal panel, the pitch between pixels is about 8 μm. For this reason, pixel displacement is more likely to appear in the image quality during assembly or use.

  On the other hand, in a projector that uses separate liquid crystal panels for red, green, and blue color lights, synthesizes the light modulated from the liquid crystal panel by the color synthesis optical system, and then projects it on the screen by the projection optical system Adjust the contrast during mass production. Specifically, the quarter-wave plate or the transparent substrate of the polarizing plate is rotated about the normal line of the liquid crystal panel as the rotation axis so that the contrast becomes optimal. Here, the transparent substrate refers to a glass substrate formed by attaching a film functioning as a quarter wavelength plate or a polarizing plate.

  As such a projector, configurations described in Patent Documents 1 and 2 are known.

  Patent Document 1 discloses a configuration in which contrast can be adjusted by enabling rotation of a circular wave plate holder that holds a circular quarter wave plate.

  In Patent Document 2, a rectangular wave plate holder that holds a rectangular quarter wave plate is provided with an arc-shaped elongated hole, and the wavelength plate holder can be rotated through the arc-shaped elongated hole, thereby adjusting contrast. The structure which can perform is disclosed.

JP 2003-177382 A JP 2007-25153 A

  Here, due to component tolerances, mounting errors, and the like, the normal line of the quarter-wave plate or the polarizing plate does not completely match the normal line of the liquid crystal panel. For example, the normal line of the ¼ wavelength plate or the polarizing plate and the normal line of the liquid crystal panel are not parallel, and the normal line of the ¼ wavelength plate or the polarizing plate is inclined with respect to the normal line of the liquid crystal panel.

  In such a case, the wavelength plate holder holding the quarter-wave plate corresponding to each color light of red, green, and blue is rotated with the normal line of the liquid crystal panel as the rotation axis for the above-described contrast adjustment. . Then, the angle formed between the normal line of the quarter wave plate and the normal line of the liquid crystal panel changes for each quarter wave plate corresponding to each color light of red, green, and blue.

  As a result, the red, green, and blue color lights have different amounts of refraction when incident on a quarter-wave plate or polarizing plate, and color misregistration may occur in the red, green, and blue images projected on the screen. There is.

  That is, in the configurations described in Patent Documents 1 and 2, the contrast can be adjusted by rotating the quarter-wave plate, but depending on the inclination of the normal line of the quarter-wave plate or the polarizing plate described above. It is difficult to suppress color misregistration.

  In general, when a pixel shift occurs in a red, green, and blue panel, a technique for adjusting a video signal in units of one pixel is known. However, in this case, adjustment of one pixel or less is difficult because the video signal is electrically shifted.

  Therefore, an object of the present invention is to provide a projection display device that can further suppress color misregistration.

In order to achieve the above object, the projection display device of the present invention provides:
A projection type display device using a light modulation element,
An optical element on which a light beam from the light modulation element is incident;
A first holding member for holding the optical element,
In a cross section parallel to the normal line of the light modulation element, the optical element is rotatable.
It is characterized by that.

  ADVANTAGE OF THE INVENTION According to this invention, the projection type display apparatus which can suppress a color shift more can be provided.

Configuration diagram of a projection display device in an embodiment of the present invention 1 is an exploded perspective view of a liquid crystal panel unit in Embodiment 1 of the present invention. The perspective view of the liquid crystal panel unit in Example 1 of this invention The perspective view of the liquid crystal panel unit in Example 1 of this invention Sectional drawing in yz section of the liquid crystal panel unit in Example 1 of this invention Sectional drawing in the xz cross section of the liquid crystal panel unit in Example 1 of this invention Sectional drawing in yz cross section of the liquid crystal panel unit in Example 2 of this invention Sectional drawing in the xz cross section of the liquid crystal panel unit in Example 2 of this invention

  Preferred embodiments of the present invention will be illustratively described below with reference to the drawings. However, the relative arrangement of the component parts described in this embodiment should be appropriately changed according to the configuration of the apparatus to which the present invention is applied and various conditions. In other words, the relative positions of the component parts are not stipulated for the purpose of limiting the scope of the present invention to the following embodiments.

[Description of Configuration of Projection Display Device]
FIG. 1 is a diagram showing a configuration of a projector (projection display device) 100 equipped with a liquid crystal panel unit 200 described later in the embodiment of the present invention.

  A light beam emitted in all directions from the light source (light emitting portion of the lamp) 1 is emitted as a substantially parallel light beam by the parabolic reflector 2. Of course, it does not have to be a completely parallel light beam, and it may be slightly diverging or converging as long as it can be used.

  This parallel light beam enters the UV-IR cut filter 3 and is divided into a plurality of partial light beams by the first lens array 4a, and each of the partial light beams is collected. Each partial beam is condensed near the second lens array 4b, and each partial beam forms a light source image (secondary light source image). The partial light beam emitted from the second lens array 4b is aligned in a predetermined polarization direction by the polarization conversion element 5, is condensed by the condenser lens 6, and illuminates the reflective liquid crystal panel 9 in a superimposed manner.

  The polarization conversion element 5 includes a plurality of PBSs, mirrors, and half-wave plates. In this embodiment, the light beam incident on the polarization conversion element 5 is converted into P-polarized light.

  The illumination optical system α is configured by the condenser lens 6 from the UV-IR cut filter 3 described above.

  The dichroic mirror 7 has characteristics of reflecting B (blue) and R (red) color light and transmitting G (green) color light.

  The PBS 8 guides the light beam in the P polarization direction out of the G color light in a direction different from the light beam in the S polarization direction, which is different in polarization direction from the light beam in the P polarization direction. Specifically, the PBS 8 is a PBS that transmits P-polarized light and reflects S-polarized light.

  Reference numerals 101 (101R, 101G, 101B) denote a liquid crystal panel for R color light, a liquid crystal panel for G color light, and a liquid crystal panel (light modulation element) for B color light, respectively. In this embodiment, the liquid crystal panel 101 is a reflective liquid crystal element.

  The quarter wavelength plates 104 (104R, 104G, 104B) are a quarter wavelength plate for R color light, a quarter wavelength plate for G color light, and a quarter wavelength plate for B color light, respectively. . In the present embodiment, the quarter wavelength plate 104 is an optical element on which a light beam from the liquid crystal panel 101 enters.

  The specific configurations of the liquid crystal panel 101 and the quarter wavelength plate 104 are as described later.

  Reference numeral 11 denotes an incident-side polarizing plate that transmits P-polarized light, and reference numeral 12 denotes a color-selective retardation plate that converts the polarization direction of R color light by 90 degrees and does not convert the polarization direction of B color light.

  The PBS 13 is a PBS that transmits P-polarized light and reflects S-polarized light, and has a polarization separation surface 13a.

  Reference numeral 14 denotes an exit side polarizing plate for G color light that transmits S-polarized light.

  The synthetic prism 17 functions as a dichroic mirror that transmits the B color light and reflects the G color light with respect to the B and G color lights. On the other hand, for the R color light, it acts as a PBS that transmits P-polarized light and reflects S-polarized light. That is, the combining prism 17 combines the B modulated light, the R modulated light, and the G modulated light. Here, the modulated light is light that is modulated by the liquid crystal panel 9 and emitted from the liquid crystal panel 9. The image light is included in the B modulated light, the R modulated light, and the G modulated light, and is to be projected on a projection surface such as a screen. The non-image light is projected on a screen or the like. Light that should not be projected onto a surface.

  A color separation / synthesis system β is configured by the synthesis prism 17 from the dichroic mirror 7 described above.

  A projection optical system 18 projects the image light from the color separation / synthesis system β onto a projection surface such as a screen (not shown).

[First embodiment]
2 to 6 are diagrams showing the configuration of the liquid crystal panel unit 200 shown in the first embodiment of the present invention. 2 to 6, the direction parallel to the short side direction of the liquid crystal panel 101 is the y-axis direction, the direction parallel to the long side direction of the liquid crystal panel 101 is the x-axis direction, and the x-axis direction and the y-axis direction are The direction orthogonal to the z-axis direction.

  FIG. 2 is an exploded perspective view of the liquid crystal panel unit 200 in this embodiment, and FIGS. 3 and 4 are assembled perspective views.

  Reference numeral 101 denotes a liquid crystal panel (light modulation element), which is fixed to the base member 127. The base member 127 has an arc sliding portion 101a, and the arc sliding portion 101a engages with an arc sliding portion 106a described later.

  Reference numeral 103 denotes a dustproof cover (protective member), which is integrated with the elastic portion 102 (first elastic member) and attached to the base member 127. By attaching the dust cover 103 to the base member 127, it is possible to suppress dust and dirt from adhering to the liquid crystal panel 101. The dust cover 103 has a screw hole 121 (second opening) and a screw hole 122 (fourth opening).

  Reference numeral 104 denotes a quarter wavelength plate. The quarter wavelength plate 104 is fixed to the wavelength plate holder 105 with an adhesive or the like, and the wavelength plate holder 105 holds the quarter wavelength plate 104.

  The wave plate holder 105 (first holding member) includes an x-direction engaging portion 106, an arc-shaped sliding portion 106a, a y-direction engaging portion 107, an arc-shaped long hole 108 (first opening), and an arc-shaped length. A hole 109 (third opening) and an air guide path 110 are provided.

  As the x-direction engaging portion 106 engages with the base substrate 127 and the y-direction engaging portion 107 engages with the dust cover 103, the quarter-wave plate 104 pushes the elastic portion 102 as described later. It is held rotatably.

  111 is an x-direction adjusting screw (first regulating member), and 112 is a y-direction adjusting screw (second regulating member). The x-direction adjusting screw 111 passes through the arc-shaped elongated hole 108 and the screw hole 121, and engages the wave plate holder 105 with the dust-proof cover 103. The y-direction adjusting screw 112 passes through the arc-shaped elongated hole 109 and the screw hole 122 described above, and engages the wave plate holder 105 with the dust-proof cover 103.

  Further, as shown in FIG. 5, the screw head of the x-direction adjusting screw 111 protrudes from the arc-shaped elongated hole 108. Thereby, the x-direction adjusting screw 111 restricts the wave plate holder 105 from rotating in the direction 129 (first direction) on the yz plane (first cross section) parallel to the normal line of the liquid crystal panel 101. Is possible.

  Further, the elastic portion 102 restricts the wave plate holder 105 from rotating in the direction 129 opposite to the direction 128 on the yz plane.

  More specifically, the x-direction adjusting screw 111 restricts the wave plate holder 105 from rotating in a direction in which the arc-shaped elongated hole 108 is separated from the liquid crystal panel 101. Further, the elastic portion 102 restricts the wave plate holder 105 from rotating in a direction in which the arc-shaped long hole 108 approaches the liquid crystal panel 101.

  As described above, the x-direction adjusting screw 111 and the elastic portion 102 restrict the rotations in the opposite directions, whereby the wave plate holder 105 can be fixed on the yz plane.

  Further, as shown in FIG. 6, the screw head of the y-direction adjusting screw 112 protrudes from the arc-shaped elongated hole 109. This restricts the wave plate holder 105 from rotating in the direction 114 (second direction) on the xz plane (second cross section) parallel to the normal line of the liquid crystal panel 101 and orthogonal to the yz plane described above. Is possible. Note that the y-direction adjusting screw 112 is provided at a position different from the x-direction adjusting screw 111.

  The elastic portion 102 further restricts the wave plate holder 105 from rotating in the direction 113 opposite to the direction 114 in the xz plane.

  More specifically, the y-direction adjusting screw 112 restricts the wave plate holder 105 from rotating in a direction in which the arc-shaped elongated hole 109 is separated from the liquid crystal panel 101. Further, the elastic portion 102 restricts the wave plate holder 105 from rotating in a direction in which the arc-shaped elongated hole 109 approaches the liquid crystal panel 101.

  As described above, the y-direction adjusting screw 112 and the elastic portion 102 restrict the rotations in the opposite directions, whereby the wave plate holder 105 can be fixed on the xz plane.

  3 and 4 are diagrams showing a state in which the wave plate holder 105 is engaged with the dust cover 103 by the x-direction adjusting screw 111 and the y-direction adjusting screw 112. FIG.

  In the state shown in FIGS. 3 and 4, the concave arcuate sliding portion 106a and the convex arcuate sliding portion 101a are engaged with each other. The wave plate holder 105 can be rotated in a cross section orthogonal to the normal line of the liquid crystal panel 101 by the arc-shaped sliding portions 101 a and 106 a and the arc-shaped long holes 108 and 109.

  In this way, by rotating the quarter wavelength plate 104 in the cross section orthogonal to the normal line of the liquid crystal panel 101, the polarization axis of the light beam incident on the liquid crystal panel 101 or emitted from the liquid crystal panel 101 is adjusted. be able to. Specifically, the extinction ratio, that is, the contrast can be adjusted to be optimal with respect to the polarization axis of the color separation / synthesis system and the liquid crystal panel.

  FIG. 5 shows a cross-sectional view of the liquid crystal panel unit 200 on the yz plane. The wave plate holder 105 is engaged with the dust-proof cover 103 while pushing the elastic portion 102 by the x-direction adjusting screw 111, the y-direction adjusting screw 112, and the y-direction engaging portion 107.

  First, a mechanism that enables the wave plate holder 105 to rotate on the yz plane (first cross section) including the normal line of the liquid crystal panel 101 will be described.

  The x-direction adjusting screw 111 is provided so as to pass through the arc-shaped elongated hole 108 provided in the wave plate holder 105 and the screw hole 122 provided in the dustproof cover 103.

  When the x-direction adjusting screw 111 is rotated to the right to tighten the screw, the elastic portion 102 contracts and the wave plate holder 105 rotates in the direction 128. That is, the wave plate holder 105 is tilted leftward in the drawing.

  On the other hand, when the x-direction adjusting screw 111 is rotated counterclockwise to loosen the screw, the wave plate holder 105 is rotated in the direction 129 by the reaction force of the elastic portion 102. That is, the wave plate holder 105 is tilted rightward on the paper surface.

  As described above, when the x-direction adjusting screw 111 moves in a direction parallel to the normal line of the liquid crystal panel 101, the force with which the wave plate holder 105 is urged toward the elastic portion 102 changes. Thereby, the quarter wavelength plate 104 can be rotated in a cross section including the optical axis of the liquid crystal panel 101.

  Next, a mechanism that enables the wave plate holder 105 to rotate on an xz plane (second cross section) orthogonal to the yz cross section will be described.

  The y-direction adjusting screw 112 is provided so as to pass through the arc-shaped elongated hole 109 provided in the wave plate holder 105 and the screw hole 122 provided in the dustproof cover 103.

  When the y-direction adjusting screw 112 is rotated to the right to tighten the screw, the elastic portion 102 contracts and the wave plate holder 105 rotates in the direction 113. That is, the wave plate holder 105 is tilted rightward on the paper surface.

  On the other hand, when the y-direction adjusting screw 112 is rotated counterclockwise to loosen the screw, the wave plate holder 105 is rotated in the direction 114 by the reaction force of the elastic portion 102. That is, the wave plate holder 105 is tilted leftward in the drawing.

  In this way, when the y-direction adjusting screw 112 moves in a direction parallel to the normal line of the liquid crystal panel 101, the force with which the wave plate holder 105 is urged toward the elastic portion 102 changes. Thereby, the quarter wavelength plate 104 can be rotated in a cross section including the optical axis of the liquid crystal panel 101.

  As described above, according to the present embodiment, the wave plate holder 105 can be rotated in the cross section including the normal line of the liquid crystal panel 101, thereby further suppressing color shift due to the above-described component tolerance, mounting error, and the like. It becomes possible to do.

  Here, for example, a liquid crystal panel with a pixel pitch of 8 μm is used, the thickness of the transparent substrate of the quarter wavelength plate is 0.7 mm, the refractive index is 1.5, and the pitch between the x direction adjusting screw 111 and the y direction adjusting screw 112. Is 0.5 mm.

  In this case, the pixel displacement can be adjusted by 3.2 μm on the liquid crystal panel by rotating the x-direction adjusting screw 111 once. When 8 μm is set for one pixel, the pixel shift can be adjusted by 0.4 pixels.

  On the other hand, when the y-direction adjusting screw 112 rotates once, the pixel shift can be adjusted by 9.2 μm on the liquid crystal panel. When 8 μm is set for one pixel, the pixel shift can be adjusted by 1.1 pixels.

  Thus, the sensitivity of one rotation of the screw in the x direction and the y direction is different because the quarter wave plate 104 is rectangular, so that even if the screw is rotated once in the x direction and the y direction, it is 1 This is because the angle at which the / 4 wavelength plate 104 tilts differs in the x direction and the y direction.

  In order to correct the pixel shift more finely, it is preferable to make the pitch of the threads of the x-direction adjusting screw 111 and the y-direction adjusting screw 112 finer.

  Further, in order to cool the quarter-wave plate 104, it is desirable that a part of the wave plate holder 105 serves as the air guide path 110 as shown in the present embodiment.

[Second Embodiment]
7 and 8 are diagrams showing the configuration of the liquid crystal panel unit 200 shown in the second embodiment of the present invention. The definition of each axial direction in FIGS. 7 and 8 is the same as that in the first embodiment.

  In the first embodiment described above, the dust-proof cover 103 as a protective member and the elastic portion 102 as the first elastic member are integrally provided. On the other hand, in this embodiment, a dust cover 116 as a protective member and a rubber frame 115 as a first elastic member are provided separately. Further, in this embodiment, a spring 118 as a second elastic member and a spring 120 as a third elastic member are newly provided in comparison with the first embodiment.

  7 is a cross-sectional view taken along the yz plane, and FIG. 8 is a cross-sectional view taken along the xz plane. Hereinafter, a mechanism that enables the wave plate holder 105 in the present embodiment to rotate will be described with reference to FIGS. 7 and 8.

  7 and 8, 105 is a wave plate holder, 115 is a rubber frame, 116 is a dustproof cover, 117 is an x-direction adjusting screw, 118 and 120 are springs, and 119 is a y-direction adjusting screw.

  First, a mechanism that enables the wave plate holder 105 to rotate on the yz plane will be described.

  The x-direction adjusting screw 117 is provided so as to pass through the arc-shaped elongated hole 108 provided in the wave plate holder 105 and the screw hole 121 provided in the dustproof cover 116. The spring 118 is provided between the wave plate holder 105 and the dust cover 116. Further, the spring 118 is provided around the x-direction adjusting screw 117.

  The rubber frame 115 is made of a material having a weaker reaction force than the elastic portion 102 in the first embodiment and the spring 118 and the spring 120 in the present embodiment.

  The x-direction adjusting screw 117 is provided so as to pass through the arc-shaped elongated hole 108 provided in the wave plate holder 105 and the screw hole 121 provided in the dustproof cover 116. When the x-direction adjusting screw 117 is rotated clockwise to tighten the screw, the rubber frame 115 and the spring 118 are contracted, and the wave plate holder 105 is rotated in the direction 123. That is, the wave plate holder 105 is tilted rightward on the paper surface.

  On the other hand, when the x-direction adjusting screw 117 is rotated counterclockwise to loosen the screw, the wave plate holder 105 is rotated in the direction 124 by the reaction force of the spring 118. That is, the wave plate holder 105 is tilted leftward in the drawing.

  Next, a mechanism that enables the wave plate holder 105 to rotate on the xz plane will be described.

  The y-direction adjusting screw 119 is provided so as to pass through the arc-shaped elongated hole 109 provided in the wavelength plate holder 105 and the screw hole 122 provided in the dustproof cover 116. The spring 120 is provided between the wave plate holder 105 and the dust cover 116. Further, the spring 120 is provided around the y-direction adjusting screw 119. When the y-direction adjusting screw 119 is rotated clockwise to tighten the screw, the rubber frame 115 and the spring 120 are contracted, and the wave plate holder 105 is rotated in the direction 125. That is, the wave plate holder 105 is tilted rightward on the paper surface.

  On the other hand, when the y-direction adjusting screw 119 is rotated counterclockwise to loosen the screw, the wave plate holder 105 is rotated in the direction 126 by the reaction force of the spring 120. That is, the wave plate holder 105 is tilted leftward in the drawing.

  Thus, even when the protective member and the first elastic member are provided separately, the wave plate holder 105 can be rotated in a plurality of cross sections by providing the spring 118 and the spring 120. Is possible.

[Other Embodiments]
In the above-described embodiment, the configuration using the reflective liquid crystal panel and the quarter-wave plate is illustrated, but the present invention is not limited to this. For example, the configuration shown in the embodiment of the present invention may be applied to a configuration using a transmissive liquid crystal panel. In such a configuration, a polarizing plate holder that holds a polarizing plate provided on the output side of the transmissive liquid crystal panel can be rotated in a cross section including the normal line of the liquid crystal panel instead of the quarter wavelength plate. It is also good. In other words, the transparent substrate holder that holds the quarter wavelength plate or the transparent substrate of the polarizing plate may be rotatable in a cross section including the normal line of the liquid crystal panel.

  In such a configuration, the optical element on which the light flux from the liquid crystal panel enters is a polarizing plate, and the first holding member that holds the polarizing plate is a polarizing plate holder.

  In the above-described embodiment, the configuration in which the wave plate holder holding the quarter wave plate is rotatable in a plurality of cross sections is exemplified, but the present invention is not limited to this. For example, a transparent substrate and a holding member for holding the transparent substrate may be newly provided between the PBS and the quarter wave plate, and the holding member may be rotatable in a cross section including the normal line of the liquid crystal panel. . In such a configuration, the quarter wavelength plate may be rotatable only in a cross section orthogonal to the normal line of the liquid crystal panel.

  Further, in the above-described embodiment, in order to suppress the color shift accompanying the contrast adjustment performed in the mass production, the configuration in which the inclination of the quarter wavelength plate can be adjusted in the mass production is illustrated, but the present invention is limited to this. It is not a thing. For example, it is a configuration that suppresses color misregistration by shooting a projected image with a camera while using a projector with a built-in camera instead of during mass production, and rotating the wave plate holder in multiple sections based on the shooting result. There may be.

  In the above-described embodiment, the configuration using the springs as the second elastic body and the third elastic body is illustrated, but the present invention is not limited to this. For example, a leaf spring or a cylindrical rubber member may be used as long as it is an elastic body that can be provided around the x-direction adjusting screw and the y-direction adjusting screw.

  In the above-described embodiment, the x-direction adjusting screw 111 and the y-direction adjusting screw 112 are illustrated as passing through holes provided in both the wave plate holder 105 and the dust cover 103, but the present invention is not limited thereto. It is not limited. For example, the x-direction adjusting screw 111 and the y-direction adjusting screw 1112 pass only through the holes provided in the dust cover 103 and hold the wave plate holder 105 with the screw heads of the x-direction adjusting screw 111 and the y-direction adjusting screw 112. It may be a configuration or the like.

1 Projector (Projection display)
101 Liquid crystal panel (light modulation element)
104 1/4 wave plate (optical element)
105 Wave plate holder (first holding member)

Claims (12)

A projection type display device using a light modulation element,
An optical element on which a light beam from the light modulation element is incident;
A first holding member for holding the optical element,
In a cross section parallel to the normal line of the light modulation element, the optical element is rotatable.
A projection type display device characterized by that. A protective member for protecting the light modulation element;
A first restricting member for restricting the first holding member from rotating in a first direction in a first cross section parallel to the normal line of the light modulation element;
A first elastic member that restricts the first holding member from rotating in a direction opposite to the first direction in the first cross section;
The optical element is configured to rotate by moving the first restricting member in a direction parallel to a normal line of the light modulation element.
The projection display device according to claim 1. The first regulating member is provided so as to pass through a first opening provided in the first holding member and a second opening provided in the protection member, Restricting the rotation of the first holding member in a direction in which the opening of 1 is separated from the light modulation element;
The first elastic member restricts the first holding member from rotating in a direction in which the first opening approaches the light modulation element;
The projection display device according to claim 2, wherein The first elastic member is provided between the first holding member and the protective member;
When the first restricting member moves in a direction parallel to the normal line of the light modulation element, the force with which the first holding member is biased toward the first elastic member is changed, so that the optical The element is configured to rotate,
The projection display device according to claim 2, wherein the projection display device is a projection type display device. The first holding member rotates in a second direction in a second cross section provided at a different position from the first regulating member and parallel to the normal line of the light modulation element and orthogonal to the first cross section. A second restricting member for restricting to perform,
The first elastic member further restricts rotation of the first holding member in a direction opposite to the second direction in the second cross section;
The projection display device according to claim 2, wherein the projection display device is a projection type display device. The second restricting member is provided so as to pass through a third opening provided in the first holding member and a fourth opening provided in the protection member. Restricting rotation of the first holding member in a direction in which the opening of 3 is separated from the light modulation element;
The first elastic member further restricts rotation of the first holding member in a direction in which the third opening approaches the light modulation element;
When the second regulating member moves in a direction parallel to the normal line of the light modulation element, the force with which the first holding member is biased toward the first elastic member is changed, so that the optical The element is configured to rotate,
The projection display device according to claim 5, wherein: The optical element is configured to be rotatable in the first cross section by moving the first regulating member in a direction parallel to a normal line of the light modulation element,
The optical element is configured to be rotatable in the second cross section by moving the second restricting member in a direction parallel to the normal line of the light modulation element.
The projection display device according to claim 5, wherein the projection display device is a projection type display device. The protective member and the first elastic member are integrally provided,
The projection display device according to claim 2, wherein the projection display device is a projection type display device. A second elastic member provided between the first opening and the second opening;
The projection display device according to claim 3, wherein the projection display device is a projection type display device. A third elastic member provided between the third opening and the fourth opening;
The projection display device according to claim 6, wherein the projection display device is a projection type display device. In a cross section orthogonal to the normal line of the light modulation element, the optical element is rotatable.
The projection display device according to claim 1, wherein the projection display device is a projection type display device. The light modulation element is a reflective liquid crystal panel,
The optical element is a quarter-wave plate;
The projection display device according to claim 1, wherein the projection display device is a projection display device.

Images