JP4547025B2 - Projection display - Google Patents

Description

  The present invention relates to a projection display device having a function of adjusting the amount of light emitted to a light valve in accordance with a video signal.

  In the projection display device, light leaked from the optical elements constituting the optical system and stray light (unnecessary light) generated by the optical elements are incident on the light valve, so that a dark image is not displayed sufficiently darkly and has high contrast. Tend to be difficult to get. In particular, when an image is projected on a screen in a dark room, unless the dark image is displayed sufficiently dark, an impression of insufficient contrast is given to the viewer. For this reason, a diaphragm mechanism having diaphragm blades as a light shielding member is arranged between the first lens array and the second lens array arranged for uniform light intensity, and the diaphragm blades are arranged according to the video signal. Projection with a function to adjust the amount of light irradiated to the light valve by sliding (sliding in a direction parallel to the second lens array) or swinging (swinging about an axis orthogonal to the optical axis direction) There is a proposal of a type display device (see, for example, Patent Document 1).

WO2005 / 026835 (6th page, 13th page, FIG. 2A, FIG. 2B, FIG. 11B, FIG. 12)

  In the above-described conventional projection display device, the change in illuminance on the light valve accompanying the operation of the diaphragm blades is made continuous (that is, there is no region where the illuminance does not change even when the diaphragm blades are operated). In addition, the tip shape of the diaphragm blade is formed in a staircase shape that is a shape corresponding to the shape of each convex lens constituting the second lens array. For this reason, the conventional projection display device has a problem that the structure of the diaphragm blade (light-shielding body) for adjusting the amount of light is complicated.

  In addition, the diaphragm mechanism in which the tip shape of the diaphragm blade is formed in accordance with the shape of each convex lens constituting the second lens array is directly applied to other projection display devices adopting lens arrays having different shapes or different sizes. Since it cannot be diverted, there is a problem that the mechanism for adjusting the amount of light cannot be shared.

  Further, in the above-described conventional projection display device, it is assumed that the shape of the diaphragm blade is formed into a rectangle with the tip shape of the diaphragm blade in a straight line, and swings (the axis of the diaphragm blade is centered about an axis orthogonal to the optical axis direction). When the tip of the stop blade comes to the position of the center of curvature of each convex lens constituting the second lens array in the vicinity of the first lens array The linear shape of the tip of the light beam forms an image on the light valve, and there is a problem that the line-shaped illuminance unevenness extending in the x-axis direction or the y-axis direction on the light valve is generated, resulting in a deterioration in the quality of the display image. This problem will be described in detail with reference to FIGS.

  Further, in the above-described conventional projection display device, it is assumed that the front end of the stop blade is linear and the stop blade is formed into a rectangular shape and swings (the center of the stop blade is centered on an axis perpendicular to the optical axis direction). 2), the unnecessary light incident on the diaphragm blades may be reflected on the second lens array side and reach the screen so that the light is reflected on the screen. Unnecessary light may be irradiated. This problem will be described in detail later with reference to FIG.

  Accordingly, the present invention has been made to solve the above-described problems of the prior art, and an object of the present invention is to make the light amount adjusting means a simple and easy-to-use structure and to adjust the light emitted to the light valve. Projection that can improve the image quality by the light amount adjustment means that can adjust the light amount continuously and without causing unevenness of illumination, so that unnecessary light reflected by the light amount adjustment means is not irradiated on the screen. To provide a mold display device.

  The projection display device of the present invention includes a z-axis that coincides with the optical axis, an x-axis that is orthogonal to the z-axis, and a y-axis that is orthogonal to both the z-axis and the x-axis, and the optical axis is on the xy plane. In the xyz coordinate system with the origin, a light source system that emits light and a convex lens whose shape on the first plane orthogonal to the z axis is a rectangle having a long side in the x axis direction and a short side in the y axis direction Are arranged in a plurality of rows and a plurality of columns on the first plane, and a first lens array that equalizes the illuminance distribution of the light emitted from the light source system, and a second that is orthogonal to the z-axis A convex lens having a rectangular shape with a long side in the x-axis direction and a short side in the y-axis direction is arranged in a plurality of rows and a plurality of columns on the second plane. Each convex lens of the first lens array is located at a position spaced from the lens array of A second lens array disposed so as to oppose each convex lens of the second lens array and uniformizing an illuminance distribution of the light transmitted through the first lens array; and light transmitted through the second lens array. A light valve that outputs light that is irradiated and modulated in accordance with a video signal, a projection optical system that projects light output from the light valve onto a screen, the first lens array, and the second lens array Between the first lens array and the second lens array. The projection type display device includes: a light amount adjusting unit that adjusts a light amount of the light irradiated to the light valve. A pair or a plurality of pairs of light shields that shield light directed toward the lens array; a pair or pairs of pivot shafts that rotatably support each of the light shields on an xy plane; Moved A rotation mechanism that controls the operation of the rotation mechanism, and the xy coordinates of the pair of light shielding bodies of the pair of light shielding bodies are the origin And the xy coordinates of the pair of rotating shafts of the pair of rotating shafts are symmetric about the origin and increase the amount of light blocked by the light blocking body. The side that becomes the head of the rotation direction of the light shielding body during the rotation of the light shielding direction is a straight tip linear portion, and the light shielding body and the rotation shaft are configured so that the light shielding body is the second portion by the rotation. After the rotation of the light shielding start position of the light shielding body that starts to shield the light toward the lens array, before the arrival of the maximum light shielding position of the light shielding body where the light shielding body shields the most light toward the second lens array. In the middle of the rotation of the light shield until The first lens array and the second lens array are arranged so as to pass in an inclined posture with respect to both the long side and the short side of the second lens array.

  According to the present invention, since the mechanism in which the light shield rotates in the xy plane orthogonal to the optical axis is adopted, the drive mechanism of the light shield can be simplified, and the tip shape of the light shield can be changed. Since it is not necessary to make the shape corresponding to the shape of each convex lens of the second lens array, the structure of the light shielding body can be simplified, and the light amount adjusting means that can be easily shared with other devices can be realized. Can be obtained.

  In addition, according to the present invention, a mechanism is employed in which the light shield rotates in the xy plane, and the tip of the light shield coincides with the joint surface position of the adjacent convex lens of the second lens array during the rotation. Thus, it is possible to continuously change the light valve irradiation light amount with respect to the rotation angle of the light shield (that is, there is no region where the illuminance does not change even if the light shield is rotated). As described above, the light valve irradiation light amount can be continuously adjusted by the light amount adjusting means, so that it is possible to obtain an effect that it is possible to continue displaying an image with sufficient contrast.

Embodiment 1 FIG.
FIG. 1 is a diagram schematically showing a configuration of a projection display apparatus 101 according to Embodiment 1 of the present invention. 2 is a front view (seen in the z-axis direction) schematically showing the configuration and operation of the rotary light shielding portion 91 of the first embodiment, and FIGS. FIG. 2 is a front view (viewed in the z-axis direction) and a side view (viewed in the x-axis direction) schematically showing the configuration and operation of the rotation mechanism 92 of the first embodiment. Further, FIG. 4 is a partially enlarged view showing the configuration of the polarization conversion element 3 of the first embodiment. In the figure, the z-axis indicates a coordinate axis that coincides with the optical axis AX of the integrator optical system 2 having the first lens array 21 and the second lens array 22, and the x-axis is a horizontal direction orthogonal to the z-axis. The y-axis indicates a vertical coordinate axis orthogonal to both the x-axis and the z-axis. In the xy coordinates, the optical axis position (z-axis position) is the origin (0, 0).

  As shown in FIG. 1, the projection display device 101 according to the first embodiment includes a light source system 1, a first lens array 21 that uniformizes the illuminance distribution of light emitted from the light source system 1, A second lens array 22 that equalizes the illuminance distribution of the light transmitted through the lens array 21, the polarization conversion element 3, the condenser lens 4, the field lens 5, the polarizing plate 6, and the light, A light valve 7 that outputs light modulated according to the video signal, a projection optical system 8 that projects the light output from the light valve 7 onto the screen SC, and the first lens array is directed to the second lens array. A light amount adjusting means 9 for adjusting the amount of light; Here, the first lens array 21 and the second lens array 22 constitute an integrator optical system 2 that makes the light illuminance distribution uniform. FIG. 1 shows a configuration relating to the optical path of light of one color. However, configurations 1 to 7 and 9 are provided for red, green, and blue, and image light of each color is displayed by a light combining element (not shown). May be projected onto the screen SC by the projection optical system 8.

  As shown in FIG. 1, the light source system 1 mainly includes a light source 11 and a reflecting mirror 12 that reflects light from the light source 11 toward the light valve 7. As the light source 11, a high-pressure mercury lamp, a halogen lamp, or a xenon lamp is usually used. However, as the light source 11, other types of light emitting devices such as LEDs, lasers, electrodeless discharge lamps, and the like can be used. The reflecting mirror 12 is, for example, a parabolic mirror or an ellipsoidal mirror. However, the shape of the reflecting mirror 12 is not limited to these, and concave mirrors of other shapes can also be used. The shape and structure of the light source system 1 may be any other shape and structure as long as the emitted light can be focused on the polarization conversion element 3. For example, when the light incident on the integrator optical system 2 from the light source system 1 is a light beam substantially parallel to the optical axis AX, the reflecting mirror 12 may be a parabolic mirror. Further, the reflecting mirror 12 is an ellipsoidal mirror, and a concave lens (not shown) is disposed between the light source system 1 and the integrator optical system 2 so that light incident on the integrator optical system 2 is substantially parallel to the optical axis AX. It is also possible to make a light flux.

  Each of the first lens array 21 and the second lens array 22 of the integrator optical system 2 has a rectangular convex lens having a long side in the x-axis direction and a short side in the y-axis direction (also referred to as a lens cell or a cell). Are arranged in a plurality of rows and a plurality of columns (matrix). The plurality of convex lenses of the first lens array 21 and the plurality of convex lenses of the second lens array 22 correspond to each other, and the corresponding convex lenses are arranged to face each other in the z-axis direction. As the first lens array 21 and the second lens array 22, those having the same shape can be used.

  The polarization conversion element 3 is an element that converts a light beam incident on itself into one type of linearly polarized light and emits it. As shown in FIG. 4, the polarization conversion element 3 includes a plurality of polarization separation films arranged at an appropriate interval in the x-axis direction and inclined with respect to the z-axis (for example, 45 degrees). 31 and a reflection film 32 disposed so as to be inclined with respect to the z axis (for example, 45 degrees) between the adjacent polarization separation films 31, and the light valve 7 side of each polarization separation film 31 (in FIG. 4) The λ / 2 phase difference plate 33 arranged on the right side) is the main configuration. Light incident on the polarization conversion element 3 (for example, light (p + s) including p-polarized light and s-polarized light) is separated into s-polarized light and p-polarized light by the polarization separation film 31. Then, the p-polarized light separated by the polarization separation film 31 passes through the polarization separation film 31 and enters the λ / 2 phase difference plate 33, and is converted into s-polarized light by the λ / 2 phase difference plate 33. Is output. The s-polarized light separated by the polarization separation film 31 is reflected by the reflection film 32 and output. Thus, most of the light (p + s) incident on the polarization conversion element 3 is converted into s-polarized light and output.

  The light valve 7 is, for example, a transmissive liquid crystal light valve. However, the type of the light valve 7 is not limited to the transmissive liquid crystal light valve, and may be another type of light valve such as a reflective liquid crystal light valve.

  The light amount adjusting means 9 includes a pair of light shielding bodies 91L and 91R that shield light traveling from the first lens array 21 toward the second lens array 22, and each of the light shielding bodies 91L and 91R on the xy plane orthogonal to the z axis. A pair of rotation shafts 91LA and 91RA that are rotatably supported above, a rotation mechanism 92 that rotates the light shields 91L and 91R, and a rotation control unit 93 that controls the operation of the rotation mechanism 92; A signal detection unit 94 that detects a video signal input to the light valve 7 and calculates a relative light quantity ratio from the detection result; The pair of light shielding bodies 91L and 91R and the pair of rotation shafts 91LA and 91RA constitute a rotation type light shielding unit 91. The rotation control unit 93 controls the rotation type light shielding unit 91 based on the relative value of the luminance of the video signal calculated by the signal detection unit 94. Specifically, the rotation controller 93 increases the amount of light shielded by the light shields 91L and 91R as the relative value of the luminance of the video signal is lower (so as to reduce the amount of light irradiating the light valve 7), and calculates. The higher the relative value of the luminance of the video signal, the smaller the amount of light shielded by the light shields 91L and 91R (so as to increase the amount of light irradiating the light valve 7), and the operation of the rotation mechanism 92 is controlled.

  FIG. 2 shows a case where the light shields 91L and 91R, the rotation shafts 91LA and 91RA, and the second lens array 22 are viewed in the z-axis direction. As shown in FIG. 2, the pair of light shields 91L and 91R are arranged at symmetrical positions about the optical axis AX, that is, the origin (0, 0), on the xy coordinates. Further, as shown in FIG. 2, the pair of rotation shafts 91LA and 91RA are arranged at symmetrical positions with respect to the optical axis AX, that is, the origin (0, 0) on the xy coordinates. Further, the light shields 91L and 91R and the rotation shafts 91LA and 91RA are rotated in a direction to increase the amount of light shielded by the light shields 91L and 91R (in FIG. 2, the light shield 91L is clockwise with respect to the light shield 91R). The clockwise direction is the direction in which the light shielding amount is increased.) The light shielding bodies 91L and 91R start to shield the light directed toward the second lens array 22 by rotation (FIG. 2). , The positions of the light shields 91L and 91R indicated by the solid lines, which are also referred to as “positions at the time of the minimum complete opening”), and the light shields 91L and 91R shield light most from the light toward the second lens array 22. The time until the maximum light shielding position of the bodies 91L and 91R (the positions of the light shielding bodies 91L and 91R indicated by the two-dot chain line in FIG. 2 are also referred to as “position at the time of maximum light shielding”). Range such that 90 degrees is arranged.

  On the xy coordinates, the rotation shaft 91LA of the light shield 91L is disposed in the positive region of the x axis (left side of the optical axis AX in FIG. 2), and the rotation shaft 91RA of the light shield 91R is negative of the x axis. It is arranged in a region (right side of the optical axis AX in FIG. 2). As shown in FIG. 2, the light shield 91L is installed so as to be rotatable in the arrow DL direction on the xy plane around the rotation shaft 91LA. Further, the light shield 91R is installed so as to be rotatable in the arrow DR direction on the xy plane around the rotation shaft 91RA. As shown in FIG. 2, the rotation type light shielding unit 91 is rotated from both sides of the optical path toward the optical axis AX by the rotation mechanism 92 according to a control signal from the rotation control unit 93 (that is, It is driven to rotate so that it protrudes into or retracts from the optical path, and the amount of light (light irradiated to the light valve 7) is adjusted according to the amount of protrusion onto the optical path. In each of the light shields 91L and 91R, the leading sides 91LB and 91RB in the rotation direction that increase the light shielding amount by the light shields 91L and 91R have a linear shape.

  As shown in FIGS. 3A and 3B, the rotation mechanism 92 is a mechanism for rotating the light shield 91L, and includes a motor 95, a gear 95a attached to the shaft of the motor 95, and a gear 95a. , A gear 96a coaxially fixed to the gear 96, and a gear 97 meshed with the gear 96a and fixed to the rotation shaft 91LA. The mechanism for rotating the light shield 91R has a similar structure. When the motor 95 is driven to rotate the gear 95a in the solid line direction (clockwise in FIG. 3A), the gears 96, 96a also rotate in the solid line direction (counterclockwise in FIG. 3A), and the gear 97 The rotation shaft 91LA and the light shield 91L rotate in the solid line direction (clockwise in FIG. 3A). When the motor 95 is driven to rotate the gear 95a in the broken line direction (counterclockwise in FIG. 3A), the gears 96, 96a also rotate in the broken line direction (clockwise in FIG. 3A), The gear 97, the rotation shaft 91LA, and the light shield 91L rotate in the direction of the broken line (counterclockwise in FIG. 3A). In addition, the structure of the rotation mechanism 91 is not limited to the example shown in the figure, and may have another structure.

  In order to improve contrast, the light amount adjusting means 9 does not block the light toward the second lens array 22 and displays an image with a low luminance of the video signal when displaying an image with a high luminance of the video signal. In such a case, the light traveling toward the second lens array 22 is shielded by an amount corresponding to the low luminance of the video signal. As a specific example, in the case of a bright video signal in which the relative value of the luminance of the video signal is 100%, the light amount adjusting unit 9 does not block the light toward the second lens array 22 (that is, 0%). The relative light quantity ratio of the light irradiated to the light valve 7 is set to 100%. When the relative value of the luminance of the video signal is 20%, the light amount adjusting unit 9 blocks 80% of the light traveling toward the second lens array 22 and irradiates the light valve 7 with relative light. The light quantity ratio is 20%. In this way, by adjusting the relative light quantity ratio, it is possible to adjust the brightness of the display image with a fineness of about 5 times. In the case of a video signal having a relative luminance value of 0%, the light amount adjusting means 9 blocks 100% of the light traveling toward the second lens array 22 and sets the relative light amount ratio irradiated to the light valve 7. It can be 0%. By operating in this way, in the case of a dark video signal having a relative luminance value of 0%, the light amount adjusting means 9 blocks 100% of the light traveling toward the second lens array 22 and is sufficiently dark. Can be displayed. By controlling in this way, contrast can be improved. This means that since the light transmittance of the light valve 7 is substantially constant, the image can be darkened by reducing the amount of light irradiating the light valve 7. Note that the relationship between the relative value of the luminance of the video signal and the relative light amount ratio of the light irradiated to the light valve 7 is not limited to the above relationship, and the relative light amount ratio increases as the relative value of the luminance of the video signal increases. You may make it have the other relationship made to do.

  FIGS. 5A and 5B are a front view (viewed in the z-axis direction) and a side view (x-axis direction) schematically showing the configuration of the rotary light-shielding portion of the projection display device of Comparative Example C1. Fig. FIG. 5A shows a case where the light shields 191T and 191B, the rotation shafts 191TA and 191BA, and the second lens array 22 are viewed in the z-axis direction. FIG. 5B shows a case where the light shields 191T and 191B and the rotation shafts 191TA and 191BA are viewed in the x-axis direction. The projection display device of Comparative Example C1 is different from the projection display device 101 according to Embodiment 1 shown in FIG. The rotation type light shielding portion of Comparative Example C1 includes rotation axes 191TA and 191BA in the x-axis direction and rectangular light shielding bodies 191T and 191B supported on the rotation shafts 191TA and 191BA, respectively. As shown in FIG. 5B, the light shields 191T and 191B are rotated about the rotation shafts 191TA and 191BA. The sides 191TB and 191BB at the tips of the light shields 191T and 191B are straight lines. FIG. 5B shows a state of movement when the light shields 191T and 191B rotate about the rotation shafts 191TA and 191BA at intervals of 15 degrees (positions P0 to P6). .

  6 is a diagram showing a simulation result of a change in the relative light quantity ratio with respect to the rotation angle in the case of the first embodiment (curve E1) of FIG. 2 and the comparative example (curve C1 ′) of FIG. FIG. 6 shows a simulation result when the rotation angle is changed by 2 degrees. In FIG. 6, the vertical axis indicates the relative light quantity ratio (%) of the light irradiated to the light valve 7. In FIG. 6, the horizontal axis indicates the rotation angles of the light shields 91L and 91R in the case of Embodiment 1 (E1) in FIG. 2 and the light shields 191T and 191B in the case of the comparative example C1 in FIG. The rotation angle is 0 degree at the position where the light shield is completely closed (position where the light shielding amount is maximum), and the light shielding amount decreases as the rotation angle increases. However, the curve C1 ′ showing the comparative example is drawn by shifting the simulation result (curve C1 shown in FIG. 7 described later) to the left in FIG. 6 in order to facilitate evaluation of the continuity of the curve. . In the curve C1 ′ (broken line) of the comparative example of FIG. 6, there are four flat portions, and even if the relative light quantity ratio does not change linearly according to the rotation of the light shield, that is, even if the light shield rotates. There is a flat portion where the relative light quantity ratio does not change, and the relative light quantity ratio does not change continuously. However, the curve (solid line) of Embodiment 1 (E1) does not have a flat portion, and the relative light quantity ratio continuously changes according to the rotation of the light shield. Therefore, in the light shielding bodies 91L and 91R of the first embodiment, the side that becomes the head in the rotational direction of the light shielding bodies 91L and 91R when rotating in the direction in which the light shielding amount by the light shielding bodies 91L and 91R is rotated is not stepped. Even in a linear shape, the relative light quantity ratio can be continuously adjusted.

  FIG. 7 is a diagram illustrating a simulation result of a change in the relative light quantity ratio with respect to the rotation angle in the comparative example of FIG. FIG. 7 is a curve C1 before the curve C1 ′ of the comparative example in FIG. 6 is shifted. The vertical axis in FIG. 7 represents the relative light quantity ratio (%) of the light irradiated on the light valve 7, and the horizontal axis represents the rotation angle of the light shields 191T and 191B in the comparative example of FIG. The rotation angle is 0 degree at the position where the light shield is completely closed (position where the light shielding amount is maximum), and the light shielding amount decreases as the rotation angle increases. In the case of the comparative example of FIG. 5, there are four flat portions C1a, C1b, C1c, and C1d where the relative light quantity ratio does not change even when the light shield rotates, and in the flat portions C1a, C1b, C1c, and C1d The relative light intensity ratio cannot be adjusted continuously.

  FIG. 8 is a diagram illustrating an example of the second light source image in the vicinity of the second lens array 22 in 256 gray scales. In FIG. 8, each of a plurality of regions LS having a substantially circular shape or a substantially oval shape close to black indicates a light source image (a bright region where light is collected) through which light from the light source system 1 passes. Further, on the outside of the light source image LS in FIG. 8, the white gap area DA existing between the many light source images LS indicates an area where light from the light source system 1 hardly passes (dark area where light does not pass). ing. However, inside the light source image LS in FIG. 8, the luminance is indicated by a gray scale of 256 gradations, and on the contrary to the outside of the light source image LS in FIG. Is a high luminance region with a large amount of light, and a dark black region is a low luminance region with a small amount of light from the light source system 1. In FIG. 8, areas 201, 202, 203, and 204 indicate areas between the light source images in the positive y-axis area (above the optical axis AX in FIG. 8). Reference numeral 204 denotes a dark part. Four flat portions C1a, C1b, C1c, and C1d appearing on the curve C1 of the comparative example of FIG. 7 are regions 204, 203, 202, and 201 between the light source images of the positive region of the y-axis in FIG. It can be considered that it is the influence of the dark part of the location. The flat portions C1a, C1b, C1c, and C1d in the comparative example in FIG. 7 correspond to the regions 204, 203, 202, and 201 between the light source images in FIG. As shown in FIG. 8, since the areas 201, 202, 203, and 204 between the light source images are areas that extend in a direction parallel to the x-axis direction, the light shields 191T and 191B as in the comparative example of FIG. When the tip shape of the light source is a straight line parallel to the x-axis and the tips of the light shields 191T and 191B are rotated with the posture parallel to the x-axis, as shown in FIG. A flat portion appears in the curve indicating the change in the. On the other hand, in the case of the first embodiment shown in FIG. 2, even if the leading edges 91LB and 91RB of the light shielding bodies 91L and 91R are straight, the leading edges of the light shielding bodies 91L and 91R in the rotational direction. Since the sides 91LB and 91RB are inclined with respect to the x axis and the opening / closing operation is performed in the xy plane, the bright portion (region close to white in the light source image LS in FIG. 8) and the dark portion (shown in FIG. 8). It is possible to continuously reduce the amount of light by simultaneously shielding the area close to black inside the light source image LS in FIG. 8 and the white part outside the light source image LS in FIG. . In other words, when the light shield is moved parallel to the x-axis or y-axis, the relative light quantity ratio is continuously changed unless the tip of the light shield is stepped like the prior art. Although it cannot be changed, in the case of the projection display apparatus 101 of the first embodiment, the relative light quantity ratio is continuously set even if the leading sides 91LB and 91RB of the light shielding bodies 91L and 91R are linear. Can be changed. As can be seen from FIG. 8, the dark region between the light source images also exists as a region in the direction parallel to the y-axis (the vertical direction in FIG. 8). Even when the lens array 22 is provided on the plus side and the minus side in the y-axis direction (Embodiment 3 described later), the relative light quantity ratio can be continuously changed.

  FIG. 9 is a diagram in which the amount of light passing through each cell (each convex lens) of the second lens array 22 is calculated by simulation, and the result is shown numerically for each cell. However, since the second lens array 22 is symmetric with respect to the x-axis (vertical symmetry in FIG. 9) and symmetric with respect to the y-axis (symmetric in FIG. 9), the optical axis AX is the origin. The simulation result is shown only for the first quadrant of the xy coordinate system. The simulation result shows the entire first quadrant normalized to 100%. Here, in order to distinguish the cells, for example, a description such as {+ H1, + V2} is used. For example, {+ H1, + V1} means a cell whose position in the y-axis direction is H1 and whose position in the x-axis direction is V1. For example, {−H1, −V1} means a cell whose position in the y-axis direction is −H1 and whose position in the x-axis direction is −V1. From FIG. 9, it can be confirmed that the amount of light emitted from the cells of {± H1, ± V2}, {± H2, ± V1}, {± H2, ± V2}, {± H3, ± V1} is large. . As can be seen from FIGS. 8 and 9, the amount of light output from the cells of {± H1, ± V2}, {± H2, ± V1}, {± H2, ± V2}, {± H3, ± V1}. Is large and has a bright portion (region close to white inside the light source image LS in FIG. 8) and a dark portion (region close to black inside the light source image LS in FIG. 8) and outside the light source image LS in FIG. Is a white portion, for example, an area where the light amount difference between the areas 204 and 203) is particularly large. Therefore, when the tip straight portion of the light shield passes through a region where the light amount difference is particularly large, it can pass as much as possible with a posture inclined with respect to the x-axis (or with respect to the regions 204 and 203 in FIG. 8). desirable. Therefore, for example, in FIG. 9, by shifting the positions of the light shields 91L and 91R (indicated by the two-dot chain line) and the rotation shaft to 91L2A and 91R2A, the cells {± H1, ± V2}, {± H2, ± V1}, {± H2, ± V2}, {± H3, ± V1} can be passed in a posture in which the straight end portion of the light shield is inclined, It is considered that more continuous light amount adjustment is possible. The light shielding body position indicated by the two-dot chain line will be described in the second embodiment.

From FIG. 9, when the sizes of the light shielding bodies 91L and 91R are the same, it is desirable that the short side length dh of the light shielding body satisfies the requirement of Equation 1, and the long side length dv satisfies the requirement of Equation 2. It is desirable to satisfy. Here, the length of each cell in the y-axis direction is H1, H2, H3, H4, H5, and the length in the x-axis direction is V1, V2, and V3.
dh ≧ H1 + H2 + H3 + H4 + H5 Equation 1
dv ≧ {(H1 + H2 + H3 + H4 + H5) ²
+ (2 × (V1 + V2 + V3)) ² } ^0.5 formula 2

  FIG. 10 is a diagram showing an outline of the locus of light when back ray tracing is performed from the center of the light valve 7. L1 indicates the locus of light. A region L2 indicates a position where the light L1 is collected. From FIG. 10, it can be confirmed that an image in the vicinity of the first lens array 21 is formed on the light valve 7. That is, the light valve 7 and the vicinity of the incident surface of the first lens array 21 have a conjugate relationship. Therefore, when the tip of each light shield is located in the vicinity of the focal position of the second lens array 22 (in the case of the comparative example in FIG. 5), the tip of each light shield 191T, 191B forms an image on the light valve 7, and the light Irradiance unevenness on the line extending in the x-axis direction is observed near the center of the bulb 7 in the y-axis direction. Therefore, as in the present invention, the light shielding bodies 91L and 91R are rotated on the xy plane and arranged near the second lens array 22, so that the above-described problem can be prevented.

  FIG. 12 shows the second row of the second lens array 22 where the tip of each light shield 191T, 191B is a condition where the image formation at the tip of each light shield 191T, 191B is easy to be confirmed in the case of the comparative example of FIG. It is a figure at the time of light-shielding by the light-shielding bodies 191T and 191B in the case of the same height (y coordinate position) as the lens cell curvature center position. FIG. 13 is a diagram showing a simulation result of the illuminance distribution on the light valve 7 in the case of FIG. FIG. 14 is an enlarged view of FIG. Here, 192 and 193 indicate straight lines in the z-axis direction passing through the center of curvature of the second lens cell from the x-axis of the second lens array 22. Further, the position of the tip of each light shield 191T, 191B is in the vicinity of the first lens array 21.

  As shown in FIG. 13, it can be confirmed that a dark portion 194 on the line in the x-axis direction is generated on the light valve 7. When the tip of each light shielding body 191T, 191B is a straight line, for example, if the width d8 of the rectangular portion at the tip is about 0.5 mm, the size in the y-axis direction of the cell in the second row of the first lens array Is about 2.5 mm, the y-axis direction portion dy of the rectangular portion at the tip is imaged on the light valve 7 to form a linear dark portion in the x-axis direction on the light valve 7 as shown in FIG. 194 occurs.

  Further, in FIG. 5, when the light is swung in the direction opposite to that of the comparative example, that is, each of the light shielding bodies 111T and 111B brings the tip of the light shielding portion closer to the second lens array 22 around an axis orthogonal to the optical axis direction. In the case of swinging in the direction, as shown in FIG. 11, the light 101a (dashed line) reflected by each light shield 111T when the light shield 111T (the lower light shield is not shown) is rotated. 2 is incident on the second lens array 22, and is multiple-reflected by the housing 10 a 1, and unnecessary light may be irradiated onto the screen SC. Note that the light shielding body facing the light shielding body 111T is not shown, and only two lenses are shown in the projection optical system 8, and the light combining element is not shown. Actually, when light that does not enter the light valve 7 also enters the projection optical system 8, it is irradiated onto the screen SC as unnecessary light. From the above, it is preferable that the rotation direction of the light shield is parallel to the xy plane.

  As described above, according to the projection display apparatus 101 according to the first embodiment, since the light shielding bodies 91L and 91R are rotated in the xy plane orthogonal to the optical axis AX, the light shielding is performed. The rotation mechanism 92 of the bodies 91L and 91R can be simplified. Further, the tip shapes 91LB and 91RB of the light shielding bodies 91L and 91R do not need to be shapes corresponding to the shapes of the convex lenses of the second lens array 22, and can be made straight. This structure can be simplified, and can also be applied to lens arrays of other shapes, so that the light quantity adjusting means 9 that can be easily shared with other devices can be realized.

  In addition, according to the projection display device according to the first embodiment, a mechanism is employed in which the light shields 91L and 91R are rotated in the xy plane, and the light shields 91L and 91R are rotated by the second lens array. Since the rotation range from the light shielding start position where the light toward 22 is started to the maximum light shielding position where the light shield shields the most light toward the second lens array 22 is 90 degrees, the light shield 91L , 91R with respect to the rotation angle, the linearity of the change in the amount of light applied to the light valve 7 can be improved. For this reason, the light amount adjusting means 9 can continuously adjust the light amount irradiated with the light valve 7, and an image with sufficient contrast can be continuously displayed.

  The light shields 91L and 91R may have a shape other than a rectangle, and may be, for example, a parallelogram, a trapezoid, or a rhombus.

  FIG. 15 is a front view (seen in the z-axis direction) schematically showing the configuration and operation of a rotary light shielding unit according to a modification of the first embodiment. The light shields 91L and 91R and the rotation shafts 91LA and 91RA shown in FIG. 15 are outside the two intersections where the x axis intersects the peripheral edge in the y axis direction of the second lens array on the second lens array 22. The two light shielding bodies 91L and 91R are secondly rotated by two z-axis direction straight lines passing through the two points on the x-axis, respectively, so as to overlap the pair of rotation shafts 91LA and 91RA. The rotation range rotation range from the light shielding start position where the light toward the lens array 22 starts to be shielded to the maximum light shielding position where the light shield shields the most light toward the second lens array is smaller than 90 degrees. The arrangement point is different from the example shown in FIG. Further, in this case, as shown in FIG. 15, since the rotation shafts 91LA and 91RA are moved outward, the lengths of the long sides of the light shielding bodies 91L and 91R are set so that the rotation shafts 91LA and 91RA Make it the same length as the distance moved outwards. In the case of FIG. 15, as shown in FIG. 2, there is an advantage that the rotation shafts 91 LA and 91 RA do not overlap the second lens array 22. In other respects, the example of FIG. 15 is the same as the example of FIG.

Embodiment 2. FIG.
FIG. 16 is a front view (seen in the z-axis direction) schematically showing the configuration and operation of the rotary light shielding portion of the projection display device according to Embodiment 2 of the present invention. The projection display device according to the second embodiment is based on the first embodiment in that the rotary light shielding unit 123 shown in FIG. 16 is used instead of the rotary light shielding unit 91 shown in FIG. Different from the projection display device 101. Therefore, FIG. 1 is also referred to in the description of the second embodiment.

  FIG. 16 shows a case where the light shields 91L2 and 91R2, the rotation shafts 91L2A and 91R2A, and the second lens array 22 are viewed in the z-axis direction. The light shields 91L2 and 91R2 in FIG. 16 correspond to the light shields indicated by two-dot chain lines in FIG. As shown in FIG. 16, the pair of light shields 91L2 and 91R2 are arranged at symmetrical positions about the optical axis AX, that is, the origin (0, 0), on the xy coordinates. Further, as shown in FIG. 16, the pair of rotating shafts 91L2A and 91R2A are arranged at symmetrical positions around the origin (0, 0) on the xy coordinates. Further, the light shields 91L2 and 91R2 and the rotation shafts 91L2A and 91R2A are rotated in a direction to increase the light shielding amount by the light shields 91L2 and 91R2 (in FIG. 2, the light shield 91L2 is clockwise and the light shield 91R2 The clockwise direction is the direction in which the light shielding amount is increased.) The light shielding start positions of the light shielding bodies 91L2 and 91R2 (FIG. 2) begin to shield the light directed to the second lens array 22 by rotation. In FIG. 2, the maximum light shielding positions of the light shielding bodies 91L2 and 91R2 that shield most light from the light shielding bodies 91L2 and 91R2 toward the second lens array 22 from the positions of the light shielding bodies 91L2 and 91R2 indicated by solid lines (2 in FIG. 2). Arrangement is made so that the rotation range to the positions of the light shields 91L2 and 91R2 indicated by the dotted lines is smaller than 90 degrees. It is.

  FIG. 17 shows a simulation of the change in the relative light quantity ratio with respect to the rotation angle (°) in the case of the first embodiment (curve E1) shown in FIG. 2 and the second embodiment (curve E2) shown in FIG. It is a figure which shows a result. Here, the simulation was performed by changing the rotation angle every 2 degrees. In FIG. 17, the vertical axis represents the relative light quantity ratio (%) of light irradiated on the light valve 7. In FIG. 17, the horizontal axis indicates the rotation angle of the light shield. The curve E2 indicated by the solid line is the case of the second embodiment in FIG. 16, the curve E1 indicated by the broken line is the case of the first embodiment in FIG. 2, and the curves E1 and E2 are both continuous (the flat portion is (Not)). The curve E1 has a slightly faster fall compared to the curve E2 (the relative light quantity ratio starts to decrease when the rotation angle becomes smaller than 90 ° in FIG. 17). By moving in parallel, the light amount adjustment range is narrowed, and light amount adjustment with good responsiveness is possible. Accordingly, when the leading sides 91L2B and 91R2B of the light shielding bodies 91L2 and 91R2 have a flat shape, the positions of the rotation shafts 91L2A and 91R2A are the positions moved in the y-axis direction as shown in FIG. It may be.

  FIG. 18 is a front view (seen in the z-axis direction) schematically showing the configuration and operation of a rotating light-shielding portion of another example of a projection display device. FIG. 18 shows an example in which the positions of the rotation shafts 131LA and 131RA of the light shielding bodies 131L and 131R are moved in the direction opposite to the movement direction in FIG. 16 (direction parallel to the y axis). FIG. 19 is a diagram showing a simulation result of the relationship between the rotation angle of the light shielding body and the relative light quantity ratio on the light valve of the projection display apparatus in the example of FIG. Here, the result of having performed the simulation by changing the rotation angle every 2 degrees is shown. In FIG. 19, the vertical axis indicates the relative light quantity ratio (%) of light irradiated on the light valve 7. In FIG. 19, the horizontal axis indicates the rotation angle (°) of the rotation type light shielding portion in the case of FIGS. 2 and 18. In the case of the first embodiment shown in FIG. 2, the curve E1 indicated by a solid line indicates the case shown in FIG. As can be seen from FIG. 19, the curve C2 in the example shows continuity when the relative light amount ratio is about 25% or more, but it can be confirmed that the continuity is impaired in the flat portion of the region 112. Accordingly, in the case where the angle between the maximum light shielding (two-dot chain line position in FIG. 18) and the minimum complete opening (solid line position in FIG. 18) is an obtuse angle, the position of the rotation shaft of each light shielding member is shown in FIG. It is preferable not to move in the direction. Note that “at the time of the minimum complete opening” corresponds to the light shielding start position of the light shield that starts to shield the light toward the second lens array by the rotation when the light shield is rotated in the direction in which the light shielding amount is increased. The “maximum light shielding time” corresponds to the maximum light shielding position of the light shielding body that shields the most light toward the second lens array.

  The flat part 112 of the curve C2 in the example shown in FIG. 19 is in the middle of turning to close the light shielding bodies 131L and 131R, and the first sides (straight lines) 131LB and 131RB in the turning direction of the light shielding bodies 131L and 131R are the second lenses. When overlapping with the boundary surface (joint surface) extending in the x-axis direction of adjacent lens cells (convex lenses) in the array, that is, the leading sides (straight lines) 131LB and 131RB in the rotational direction of the light shielding bodies 131L and 131R are in the x-axis direction. It appears remarkably when only the dark part between the lens cells extending to is shielded. This is because the amount of light emitted from the light valve 7 does not change in the rotation range in which only the dark part between the lens cells is shielded. Accordingly, in the middle of the rotation, the leading sides 131LB and 131RB in the rotation direction of the light shielding bodies 131L and 131R do not overlap with the joint surface of the adjacent lens cell in the x-axis direction (or y-axis direction) in the z-axis direction. It is preferable. Therefore, it is preferable that each of the light shields 131L and 131R does not have an obtuse angle between the maximum light shielding and the minimum complete opening, that is, 90 degrees or less.

  FIG. 20 shows the rotation shafts 91L2A and 91R2A of the light shielding bodies 91L2 and 91R2 in the y-axis direction, particularly when the leading edge of the light shielding body in the rotation direction when the light shielding amount is increased is parallel to the x axis. It is a front view (figure seen in z-axis direction) which shows an unpreferable rotation axis position in the case of arranging in a shifted position. In FIG. 20, when the rotation shafts 91L2A and 91R2A of the light shielding bodies 91L2 and 91R2 are arranged at the black circle positions, the joint surface of the cell (convex lens) in which the position of the dark part on the x axis shown in FIG. Therefore, the flat portion 112 in FIG. 19 is generated in the middle of light shielding. Therefore, it is not preferable to arrange the rotation shafts 91L2A and 91R2A of the light shielding bodies 91L2 and 91R2 at or near the black circle positions in FIG. In addition, it is not preferable for the same reason to arrange the rotation shafts of the respective light shielding bodies on the straight line in the x-axis direction passing through the black circle positions in FIG.

  As described above, according to the projection display device according to the second embodiment, the light shielding body 91L2 and 91R2 are rotated on the xy plane orthogonal to the optical axis AX. The rotation mechanism 92 of 91L2 and 91R2 can be simplified. Further, since the light-shielding bodies 91L2 and 91R2 are not required to have a shape corresponding to the shape of each convex lens of the second lens array 22 at the leading sides 91L2B and 91R2B in the rotational direction, the light amount adjusting means 9 can be simplified, and can be applied to lens arrays of other shapes. Therefore, the light quantity adjusting means 9 that can be easily shared can be realized.

  Further, according to the projection type display apparatus according to the second embodiment, a mechanism in which the light shielding bodies 91L2 and 91R2 rotate on the xy coordinates orthogonal to the optical axis AX is adopted, and the light shielding bodies 91L2 and 91R2 are rotated by the rotation. The rotation range from the light shielding start position at which the light toward the second lens array 22 begins to be shielded to the maximum light shielding position at which the light shield shields most of the light toward the second lens array is made smaller than 90 degrees. Therefore, the continuity of the change in the light quantity of the light valve 7 with respect to the rotation angle of the light shields 91L2 and 91R2 can be increased. For this reason, the light amount adjusting means 9 can continuously adjust the light amount irradiated with the light valve 7, and an image with sufficient contrast can be continuously displayed.

  FIG. 21 is a front view (seen in the z-axis direction) schematically showing the configuration and operation of a rotary light shielding unit according to a modification of the second embodiment. In the light shields 91L2 and 91R2 and the rotation shafts 91L2A and 91R2A shown in FIG. 21, a straight line inclined with respect to the x axis on the second lens array 22 intersects the peripheral edge in the y axis direction of the second lens array. Two straight lines in the z-axis direction passing through two points on the outer side in the x-axis direction from the two intersections overlap with the pair of rotation shafts 91L2A and 91R2A, respectively, and the light shielding member 91L2 by the rotation. , 91R2 has a rotation range rotation range of 90 degrees from the light shielding start position at which the light toward the second lens array 22 begins to be shielded to the maximum light shielding position at which the light shielding body shields the most light toward the second lens array. The point arrange | positioned so that it may become smaller differs from the example shown by FIG. Further, in this case, as shown in FIG. 21, since the rotation shafts 91L2A and 91R2A are moved to the outside, the lengths of the long sides of the light shielding bodies 91L2 and 91R2 are set to the rotation shafts 91L2A and 91R2A. Make it the same length as the distance moved outwards. In the case of FIG. 21, there is an advantage that the rotation shafts 91L2A and 91R2A do not overlap the second lens array 22. In other respects, the example of FIG. 21 is the same as the example of FIG.

  In the second embodiment, points other than those described above are the same as those in the first embodiment.

Embodiment 3 FIG.
FIG. 22 is a front view (seen in the z-axis direction) schematically showing the configuration and operation of the rotary light shielding section 125 of the projection type display apparatus according to Embodiment 3 of the present invention. The projection type display device according to the third embodiment relates to the first embodiment in that a rotation type light shielding unit 125 shown in FIG. 22 is used instead of the rotation type light shielding unit 91 shown in FIG. Different from the projection display device 101. Therefore, FIG. 1 is also referred to in the description of the third embodiment.

  The light amount adjusting means 9 according to the third embodiment includes a pair of light shielding bodies 91T and 91B that shield light traveling from the first lens array 21 toward the second lens array 22, and each of the light shielding bodies 91T and 91B on the z axis. A pair of rotation shafts 91TA and 91BA that are rotatably supported on an xy plane orthogonal to the rotation axis 92, a rotation mechanism 92 that rotates the light shielding bodies 91T and 91B, and a rotation that controls the operation of the rotation mechanism 92. It has a control unit 93 and a signal detection unit 94 that detects a video signal input to the light valve 7 and calculates a relative light amount ratio (relative light amount ratio of light amount irradiated to the light valve 7) from the detection result. ing. The pair of light shielding bodies 91T and 91B and the pair of rotation shafts 91TA and 91BA constitute a rotation type light shielding unit 125. The rotation control unit 93 controls the rotation of the light shields 91T and 91B based on the relative light quantity ratio calculated by the signal detection unit 94.

  As shown in FIG. 22, the pair of light shields 91T and 91B is disposed at a point-symmetrical position about the optical axis AX, that is, the origin (0, 0), on the xy coordinates. Further, as shown in FIG. 22, the pair of rotation shafts 91TA and 91BA are arranged at point-symmetrical positions around the origin (0, 0) on the xy coordinates. Further, the light shields 91T and 91B and the rotation shafts 91TA and 91BA are rotated in a direction to increase the amount of light shielded by the light shields 91T and 91B (in FIG. 22, the light shield 91T is clockwise and the light shield 91B is clockwise). The clockwise direction is the direction in which the light shielding amount is increased.) The light shielding start positions of the light shielding bodies 91T and 91B (FIG. 2) start to shield the light toward the second lens array 22 by the rotation. In FIG. 2, the maximum light shielding positions of the light shielding bodies 91T and 91B that shield the most light from the light shielding bodies 91T and 91B toward the second lens array 22 from the light shielding bodies 91T and 91B indicated by solid lines (in FIG. The rotation range to the light shielding bodies 91T and 91B indicated by dotted lines is 90 degrees.

  If the optical axis AX is described as the origin (0, 0) of the xy coordinate system, the rotation axis 91TA of the light shield 91T is in the positive region of the y axis (above the optical axis AX in FIG. 22) on the xy coordinates. The rotation shaft 91BA of the light shield 91B is disposed in the negative region of the y axis (below the optical axis AX in FIG. 22). As shown in FIG. 22, the light shield 91T is installed so as to be rotatable in the direction of the arrow DT on the xy plane around the rotation shaft 91TA. Further, the light shield 91B is installed so as to be rotatable in the arrow DB direction on the xy plane around the rotation shaft 91BA. The rotation type light shielding unit 125 is driven to rotate by the rotation mechanism 92 so as to protrude from both sides of the optical path toward the optical axis AX side or to retreat from the optical path in accordance with a control signal from the rotation control unit 93. The amount of light applied to the light valve 7 is adjusted according to the amount of protrusion on the road. In each of the light shields 91T and 91B, the leading sides 91TB and 91BB in the rotation direction that increase the amount of light shielded by the light shield have a linear shape.

As shown in FIG. 22, when the light shielding bodies 91T and 91B are provided in the y-axis direction, assuming that the short side length of the light shielding bodies 91T and 91B is dh2, and the long side length is dv2, It is preferable to satisfy the expressions 3 and 4.
dh2 ≧ V1 + V2 + V3 Equation 3
dv2 ≧ {(2 × (H1 + H2 + H3 + H4 + H5)) ²
+ (V1 + V2 + V3) ² } ^0.5 formula 4

  FIG. 23 shows the rotation shafts 91TA and 91BA of the light shields 91T2 and 91B2 in the x-axis direction, particularly when the leading edge of the light shield in the rotational direction when turning to increase the light shielding amount is parallel to the y-axis. It is a top view (figure seen in the minus y-axis direction) showing an undesired rotation axis position when it is arranged at a shifted position. FIG. 24 is a schematic perspective view showing a part of the polarization conversion element 3 of FIG. From FIG. 23, the p-polarized light and the s-polarized light (p + s) are incident on the position (light transmission region) indicated by the thick solid line, and are not incident on the other light non-transmission region. In addition, an example of a region of light that does not enter the polarization conversion element 3 (corresponding to a light non-transparent region shown by cross-hatching in FIG. 24) is shown in dotted line regions X1, X2, X3, X4, X5, and X6 in FIGS. Show. Dotted line regions X1, X2, X3, X4, X5, and X6 are positions of joint portions between lens cells (convex lenses) adjacent to the second lens array 22 in the x-axis direction. Therefore, it is preferable that the positions of the rotation axes TA and 91BA of the light shields 91T2 and 91B2 are not arranged at the positions of the joint portions between the lens cells (convex lenses) adjacent to the second lens array 22 in the x-axis direction. In particular, it is preferable not to arrange the rotation shafts 91TA and 91BA in the position in the y-axis direction (shaded area in FIG. 23) of the region that is not incident on the polarization conversion element 3, and the axes of Y1, Y2, and Y3 that are the center positions thereof. It is particularly preferable that the pivot shafts 91TA and 91BA are not arranged on the top. The light-impermeable region is a region where invalid linearly polarized light is emitted, that is, a region where all light becomes p-polarized light (invalid linearly polarized light) instead of s-polarized light (effective linearly polarized light) when incident. It is. Therefore, normally, an ineffective area formed by disposing a light shielding plate (not shown) between the second lens array 22 and the polarization conversion element 3 is set as a light impermeable area. In other words, the light-impermeable region is a region from which invalid linearly polarized light is emitted when light is incident. If light is incident on the light-impermeable area, the incident p-polarized light is emitted as p-polarized light (invalid linearly polarized light) without being converted and is incident on the light-impermeable area. The light is reflected by the reflection film, converted into p-polarized light (invalid linearly polarized light) by the λ / 2 phase difference plate 33, and emitted.

  As described above, according to the projection display device according to the third embodiment, the same effect as in the first embodiment can be obtained.

  In the third embodiment, as in the case of FIG. 15 (modified example of the first embodiment), the light shielding bodies 91T and 91B and the rotation shafts 91TA and 91BA are arranged on the second lens array 22 in the y-axis. Two z-axis straight lines passing through two points on the y-axis outside the two intersections intersecting the peripheral edge in the x-axis direction of the second lens array 22 are a pair of rotation axes. And the rotation range may be smaller than 90 degrees. In this case, the same effect as in FIG. 15 can be obtained.

  In the third embodiment, as in the case of FIG. 16 (Embodiment 2), the light shields 91T and 91B and the rotation shafts 91TA and 91BA are arranged on the second lens array 22 with respect to the y axis. The two straight lines in the z-axis direction passing through the two intersections where the inclined straight line intersects the peripheral edge in the x-axis direction of the second lens array 22 overlap with the pair of rotation shafts 91TA and 91BA, respectively. The angle formed by the inclined straight line with respect to the y axis is an angle formed by the straight line connecting the optical axis and the corner of the second lens array 22 with respect to the y axis. You may arrange | position so that it may become smaller. In this case, the same effect as in FIG. 16 can be obtained.

  In the third embodiment, similarly to the case of FIG. 21 (modified example of the second embodiment), the light shields 91T and 91B and the rotation shafts 91TA and 91BA are arranged on the second lens array 22 in the y axis. Two z-axis direction straight lines that pass through two points on the outer side in the y-axis direction than two intersections where the straight line inclined with respect to the second lens array 22 intersects the peripheral edge in the x-axis direction are 1 The angle formed by the inclined straight line with respect to the y-axis is the same as that of the optical axis AX with respect to the y-axis, so as to overlap with the pair of rotation axes 91TA and 91BA, respectively, and the rotation range is smaller than 90 degrees. You may arrange | position so that it may become smaller than the angle which the straight line which connects the corner | angular part of the lens array 22 of 2 forms. In this case, the same effect as in FIG. 21 can be obtained.

  In the third embodiment, points other than the above are the same as in the first or second embodiment.

Embodiment 4 FIG.
FIG. 26 is a front view (seen in the z-axis direction) schematically showing the configuration and operation of the rotary light-shielding portion 126 of the projection display device according to Embodiment 4 of the present invention. The projection display device according to the fourth embodiment is based on the first embodiment in that a rotation type light shielding unit 126 shown in FIG. 26 is used instead of the rotation type light shielding unit 91 shown in FIG. Different from the projection display device 101. Therefore, FIG. 1 is also referred to in the description of the fourth embodiment. In FIG. 26, the same reference numerals are given to the components corresponding to those in FIGS.

  As shown in FIG. 26, the rotation type light shielding part 126 of the projection display device according to the fourth embodiment includes two pairs of light shielding bodies 91L, 91R and 91T, 91B and two pairs of rotation shafts 91LA, 91RA. And 91TA, 91BA. The light shielding bodies 91L and 91R and the rotation shafts 91LA and 91RA are two on the second lens array 22 that pass through each of two intersections where the x-axis intersects the peripheral edge of the second lens array 22 in the y-axis direction. The straight lines in the z-axis direction are arranged so as to overlap the pair of turning shafts 91LA and 91RA, respectively, and the light shielding bodies 91L and 91R are arranged so that the turning range is 90 degrees. Further, the light shields 91T and 91B and the rotation shafts 91TA and 91BA pass through each of two intersections on the second lens array 22 where the y-axis intersects the peripheral edge of the second lens array 22 in the x-axis direction. The two straight lines in the z-axis direction are arranged so as to overlap the rotation shafts 91TA and 91BA, respectively, and the rotation range of the pair of light shields 91T and 91B is 90 degrees.

  As shown in FIG. 26, by providing the four light shields 91L, 91R, 91T, and 91B, the change in the relative light quantity ratio with respect to the rotation angle of the light shield becomes larger than in the case of FIG. Will improve.

  FIG. 27 is a diagram showing a simulation result of a change in the relative light quantity ratio with respect to the rotation angle in the case of FIGS. Here, the result of having performed the simulation by changing the rotation angle every 2 degrees is shown. In FIG. 27, the vertical axis represents the relative light quantity ratio of the light irradiated on the light valve 7. In FIG. 27, the horizontal axis indicates the rotation angle of the light shield in the case of FIGS. Curve E4 shows the case of FIG. 26 (Embodiment 4), and curve E1 shows the case of FIG. 2 (Embodiment 1). The characteristic of the fourth embodiment does not have a flat portion where the relative light quantity ratio does not change with the change of the rotation angle, and has good continuity. The characteristic (curve E4) of the fourth embodiment is that the rotation angle when the relative light quantity ratio changes from 80% to 100% is smaller than that of the curve E1, and the curve E4 is 80% to 100%. It can be seen that the response at high gradation is improved. Therefore, as shown in FIG. 26, by having the four light shields 91L, 91R, 91T, and 91B, the light amount can be continuously adjusted with high responsiveness. Moreover, since the opening is point-symmetric, uneven illuminance on the light valve 7 does not occur when the relative light quantity ratio is about 15%.

  As described above, according to the projection display device according to the third embodiment, the same effect as in the first embodiment can be obtained.

  Further, in the fourth embodiment, as in the case of FIG. 15 (modified example of the first embodiment), the light shields 91L and 91R and the rotation shafts 91LA and 91RA are arranged on the second lens array 22 in the x axis. Are two straight lines in the z-axis direction passing through two points on the x-axis that are outside the two intersections that intersect the peripheral edge in the y-axis direction of the second lens array 22. You may arrange | position so that it may overlap with 91LA and 91RA, respectively, and a rotation range may become smaller than 90 degree | times. Further, in the fourth embodiment, similarly to the case of FIG. 15 (modified example of the first embodiment), the light shielding bodies 91T and 91B and the rotation shafts 91TA and 91BA are arranged on the second lens array 22 in the y axis. Two z-axis straight lines passing through two points on the y-axis outside the two intersections intersecting the peripheral edge in the x-axis direction of the second lens array 22 are a pair of rotation axes. And the rotation range may be smaller than 90 degrees. In this case, the same effect as in FIG. 15 can be obtained.

  Further, in the fourth embodiment, similarly to the case of FIG. 16 (second embodiment), the light shields 91L and 91R and the rotation shafts 91LA and 91RA are arranged on the second lens array 22 with respect to the x axis. The two straight lines in the z-axis direction passing through the two intersections where the inclined straight lines intersect the peripheral edge in the y-axis direction of the second lens array 22 overlap with the pair of rotation shafts 91LA and 91RA, respectively. The angle formed by the inclined straight line with respect to the x axis is an angle formed by the straight line connecting the optical axis and the corner of the second lens array 22 with respect to the x axis. You may arrange | position so that it may become smaller. Further, two straight lines that incline the light shields 91T and 91B and the rotation shafts 91TA and 91BA with respect to the y-axis on the second lens array 22 intersect the peripheral edge of the second lens array 22 in the x-axis direction. The two straight lines in the z-axis direction passing through each of the intersections are arranged so as to overlap the pair of rotation shafts 91TA and 91BA, respectively, and the rotation range is smaller than 90 degrees, and the inclination with respect to the y-axis The angle formed by the straight line may be smaller than the angle formed by the straight line connecting the optical axis and the corner of the second lens array 22 with respect to the y-axis. In this case, the same effect as in FIG. 16 can be obtained.

  Further, in the fourth embodiment, similarly to the case of FIG. 21 (modified example of the second embodiment), the light shields 91L and 91R and the rotation shafts 91LA and 91RA are arranged on the second lens array 22 in the x-axis. Two z-axis direction straight lines passing through two points on the outer side in the x-axis direction than the two intersection points where the straight line inclined with respect to the y-axis direction periphery of the second lens array 22 intersects each other are 1 The angle formed by the inclined straight line with respect to the x-axis is the same as that of the optical axis AX with respect to the x-axis, and is arranged so as to overlap with the pair of rotation axes 91LA and 91RA. You may arrange | position so that it may become smaller than the angle which the straight line which connects the corner | angular part of the lens array 22 of 2 forms. Further, two straight lines that incline the light shields 91T and 91B and the rotation shafts 91TA and 91BA with respect to the y-axis on the second lens array 22 intersect the peripheral edge of the second lens array 22 in the x-axis direction. Two z-axis direction straight lines passing through each of the two points outside the intersection in the y-axis direction overlap each other with a pair of rotation axes 91TA and 91BA, and the rotation range is smaller than 90 degrees. The angle formed by the inclined straight line with respect to the y-axis may be smaller than the angle formed by the straight line connecting the optical axis AX and the corner of the second lens array 22 with respect to the y-axis. Good. In this case, the same effect as in FIG. 21 can be obtained.

  The fourth embodiment is the same as the first to third embodiments except for the points described above.

Embodiment 5 FIG.
FIG. 28 is a diagram schematically showing a configuration of a projection display apparatus 105 according to the fifth embodiment of the present invention. 28, the same reference numerals are given to the same or corresponding components as those shown in FIG. FIG. 29 is a front view (seen in the z-axis direction) schematically showing the configuration and operation of the rotary light shielding unit 128 of the fifth embodiment. The projection type display device 105 according to the fifth embodiment is different from the first embodiment in that a rotary light shielding unit 128 shown in FIG. 29 is used instead of the rotary light shielding unit 91 shown in FIG. This is different from the projection display apparatus 101.

  As shown in FIG. 29, the rotary light shielding unit 128 includes a pair of light shielding bodies 128L and 128R and the light shielding bodies 128L and 128R on the xy plane with respect to the housing (not shown) of the projection display device 105. Rotating shafts 128LA and 128RA are rotatably supported on the upper side. The pair of light shields 128L and 128R are arranged at point-symmetrical positions in the xy coordinate system centered on the optical axis AX, that is, the origin (0, 0), and the pair of rotation axes 128LA and 128RA It is arranged at a point-symmetrical position about the axis AX. The light shields 128L and 128R and the rotation shafts 128LA and 128RA rotate the light shields 128L and 128R toward the second lens array 22 by the rotation when the light shields 128L and 128R are rotated in the direction in which the light shielding amount is increased. The light shielding bodies 128L and 128R head toward the second lens array 22 from the light shielding start positions (the positions of the light shielding bodies 128L and 128R indicated by solid lines in FIG. 29 at the time of the minimum complete opening) of the light shielding bodies 128L and 128R that start to shield light. The rotation range to the maximum light shielding position of the light shielding bodies 128L and 128R that shields the most light (maximum light shielding position and the positions of the light shielding bodies 128L and 128R indicated by two-dot chain lines in FIG. 29) is made smaller than 90 degrees. Placed in position. The light shields 128L and 128R and the rotation axes 128LA and 128RA are arranged in the x-axis direction in which at least a part of the light shields 128L and 128R intersects the optical axis AX when the light shields 128L and 128R are at the light shielding start position. And are arranged so as to overlap the z-axis direction. As shown in FIG. 29, the light shields 128L and 128R and the rotation shafts 128LA and 128RA pass through each of the two corners of the second lens array 22 located symmetrically about the optical axis AX. Two straight lines in the z-axis direction are arranged so as to overlap the pair of rotation shafts 128LA and 128RA, respectively. Here, the positions of the light shielding bodies 128L and 128R in the z-axis direction may be different.

  As shown in FIG. 29, the light shielding bodies 128L and 128R are rotated symmetrically around the optical axis AX from both sides of the optical path, as shown in FIG. 29, and the light shielding amount is set according to the amount of projection onto the optical path. It adjusts and the light quantity of the light irradiated to the light valve 7 is adjusted. The sides 128LB and 128RB at the top in the rotation direction when increasing the light shielding amount of the light shielding bodies 128L and 128R have a linear shape.

  FIG. 30 is a diagram illustrating a simulation result of the relationship between the rotation angle of the light blocking body and the relative light quantity ratio on the light valve of the projection display device according to the fifth embodiment. FIG. 30 is a diagram illustrating simulation results of changes in the relative light quantity ratio (%) with respect to the rotation angle (°) in the case of FIGS. 29 and 5. Here, the result of having performed the simulation by changing the rotation angle every 2 degrees is shown. In FIG. 30, the vertical axis represents the relative light quantity ratio of light irradiated on the light valve 7. 30, the horizontal axis indicates the rotation angle of the light shield in the case of the embodiment 5 (curve E5) of FIG. 29 and the curve C1 ″ of the comparative example of FIG. 5. The curve E5 is a curve in the case of FIG. C1 ″ indicates a change in the rotation angle and the relative light quantity ratio on the light valve 7 in the case of FIG. In order to emphasize the continuity of the curve, the curve C1 ″ is shifted in the horizontal axis direction of FIG. 30. From FIG. 30, the curve C1 ″ has four flat portions and is not a continuous curve. However, the curve E5 shows a substantially continuous curve in which the relative light quantity ratio keeps changing (there is no flat portion) as the rotation angle changes. Therefore, in each of the light shielding bodies 128L and 128R, by setting the position of the rotation axis to a position overlapping the four corners of the second lens array 22, concave portions (stepped steps) are formed on the sides of the front end portions 128LB and 128RB. It is possible to continuously adjust the amount of light without forming.

  In addition, the rotation angle range for changing the relative light quantity ratio from 0% to 100% is about 40 degrees, and adjustment with higher responsiveness is possible compared to Comparative Example C1 (FIG. 7). Therefore, in order to perform adjustment with high responsiveness, it is preferable that the rotation shafts of the respective light shielding bodies be diagonal positions of the four corners of the second lens array 22.

  In FIG. 29, since the second light source image shown in FIG. 8 is shielded from the peripheral columns, it is possible to simultaneously shield the light and dark portions, and the light amount change with respect to the rotation angle becomes continuous. Compared with the case of FIG. 2, the angle at the time of maximum light shielding and at the time of minimum complete opening is small, so the change in the amount of light with respect to the rotation angle becomes large, and the responsiveness improves.

From FIG. 29, in order to perform the light amount adjustment continuously and with high responsiveness, the sizes of the light shielding bodies 128L and 128R are as shown in FIG. 29, the short side direction length dh3 is Equation 5, and the long side direction length dv3 is It is preferable to satisfy Equation 6.
dh3 ≧ {(H1 + H2 + H3 + H4 + H5) ²
+ (V1 + V2 + V3) ² } ^0.5 formula 5
dv3 ≧ {(2 × (H1 + H2 + H3 + H4 + H5)) ²
+ (2 × (V1 + V2 + V3)) ² } ^0.5 formula 6

  As described above, according to the fifth embodiment, it is possible to continuously adjust the amount of light without forming concave portions on the protruding side portions of the light shielding bodies 128L and 128R. Further, in the z-axis direction, the vicinity of the second lens array 22 is used as a rotation axis, and rotation is performed on the xy plane. Therefore, unevenness in illuminance on the x-axis direction line generated on the light valve 7 does not occur.

  Further, the same effect can be obtained even if the rotation shafts of the light shielding bodies 128L and 128R move in the diagonal direction of the second lens array 22. However, in that case, in each of the light shielding bodies 128L and 128R, it is necessary to consider the length in the short side direction and the length in the long side direction, not the obtuse angle between the maximum light shielding and the minimum complete opening.

  FIG. 31 is a front view (seen in the z-axis direction) schematically showing the configuration and operation of a rotary light shielding unit according to a modification of the fifth embodiment. 31, the same or corresponding parts as those in FIG. 29 are denoted by the same reference numerals. In the example of FIG. 31, the light shields 128L and 128R and the rotation axes 128LA and 128RA are two positions symmetrical about the optical axis AX, and are more than the two corners of the second lens array 22. Two straight lines in the z-axis direction passing through two positions separated from the second lens array 22 by separating the light shields 128L and 128R and the rotation shafts 128LA and 128RA from each other are a pair of rotation shafts 128LA, It arrange | positions so that it may each overlap with 128RA. That is, the example of FIG. 31 has a structure in which the rotation shaft 128LA of FIG. 29 is moved to the plus side in the x-axis direction and the rotation shaft 128RA is moved to the minus side in the x-axis direction. In the case of FIG. 31, as shown in FIG. 29, there is an advantage that the rotation shafts 128LA and 128RA do not overlap the second lens array 22. In other respects, the example of FIG. 31 is the same as the example of FIG.

  The fifth embodiment is the same as the first to fourth embodiments except for the points described above.

  6, 7, 17, 19, 27, and 30 all show the relative light quantity ratio at the time of 100% signal, and show only the characteristics of the rotary light shielding unit 91.

Embodiment 6 FIG.
In the first and second embodiments, the light shielding body and the rotation shaft shield the light that is directed to the second lens array 22 by the rotation when the light shielding body and the rotation shaft are rotated in the direction in which the light shielding amount by the light shielding body is increased. This is a case where the rotation range from the light shielding start position of the starting light shielding body to the maximum light shielding position of the light shielding body that shields the most light toward the second lens array 22 from the light shielding start position is 90 degrees or less. When the light shield and the rotation shaft are arranged so that at least a part of the light shield overlaps the x axis or the y axis when the light shield is at the light shielding start position (hereinafter referred to as “first condition”). "If you meet") explained.

  In the second embodiment, an undesired rotation shaft position will be described with reference to FIGS. 19 and 20, and the rotation shaft is disposed at a position other than the undesired rotation position (hereinafter referred to as “No. 1”). "When the condition of 2 is satisfied").

  The projection display apparatus according to the sixth embodiment is an example that satisfies the second condition. In addition to the case where the first condition is satisfied, the projection type display device of Embodiment 6 includes the case shown in FIG. 18, that is, the point including the case where the rotation range is larger than 90 °. This is different from the second embodiment. In the projection display device according to the sixth embodiment, the position of the side in the y-axis direction when the light-shielding body rotates and the side is in the x-axis direction is the second lens array. No. 22 is arranged so as to be at a position other than the position in the y-axis direction of the cemented surface of the convex lenses adjacent in the y-axis direction. The projection display device according to the sixth embodiment employs a mechanism in which the light shielding body rotates in the xy plane. However, the rotation range from the light shielding start position to the maximum light shielding position may be 90 ° or more. In the middle of the rotation, the tip of the light shield may be parallel to the x-axis, but it does not coincide with the joint surface position of the adjacent convex lens of the second lens array. Can be continuously changed (that is, there is no region where the illuminance does not change even if the light shielding member is rotated). Since the projection type display apparatus of Embodiment 6 can continuously adjust the light valve irradiation light quantity by the light quantity adjusting means, it can continue to display an image with sufficient contrast.

  Note that the second condition can also be applied to the case where the light shields are above and below the second lens array 22 (including the case of FIG. 22). In that case, the position of the side in the x-axis direction when the light-shielding body rotates and the side is in the y-axis direction is adjacent to the x-axis direction of the second lens array 22. It arrange | positions so that it may become a position other than the position of the x-axis direction of the joint surface of the convex lens to perform.

  The sixth embodiment is the same as the first to fourth embodiments except for the points described above.

Embodiment 7 FIG.
In the first and second embodiments, the light shielding body and the rotation shaft shield the light that is directed to the second lens array 22 by the rotation when the light shielding body and the rotation shaft are rotated in the direction in which the light shielding amount by the light shielding body is increased. This is a case where the rotation range from the light shielding start position of the starting light shielding body to the maximum light shielding position of the light shielding body that shields the most light toward the second lens array 22 from the light shielding start position is 90 degrees or less. When the light shield and the rotation shaft are arranged so that at least a part of the light shield overlaps the x axis or the y axis when the light shield is at the light shielding start position (hereinafter referred to as “first condition”). "If you meet") explained.

  In the third embodiment, an undesired rotation axis position is described with reference to FIGS. 22 to 25, and the rotation axis is disposed at a position other than the unfavorable rotation position (hereinafter referred to as “No. 1”). "When the condition 3 is satisfied").

  The projection display apparatus according to the seventh embodiment is an example that satisfies the third condition. In addition to the case where the first condition is satisfied, the projection type display device according to the seventh embodiment includes the case shown in FIG. 18, that is, the point including the case where the rotation range is larger than 90 °. This is different from the third embodiment. In the projection display device according to the seventh embodiment, the polarization conversion element 3 includes a plurality of light transmission regions elongated in the x-axis direction and a plurality elongated in the x-axis direction on the surface on the second lens array 22 side. Light non-transparent areas are alternately arranged in the y-axis direction, and the light transmitted through the second lens array 22 and incident on the light transmissive area is separated into first polarized light and second polarized light, The separated first polarized light is output, and the separated second polarized light is converted into first polarized light to be output. The light shielding body and the rotation shaft have the sides rotated by the light shielding body rotating. The positions of the sides in the x-axis direction are arranged so that the positions in the y-axis direction are outside the range in the y-axis direction where the light-impermeable region exists. The projection display device according to the seventh embodiment employs a mechanism in which the light shielding body rotates within the xy plane. However, the rotation range from the light shielding start position to the maximum light shielding position may be 90 ° or more. During the rotation, the tip of the light shield may be parallel to the x-axis, but the light-impermeable region (this region is a region including the joint surface position of the adjacent convex lens of the second lens array 22). Therefore, it is possible to continuously change the light valve irradiation light quantity with respect to the rotation angle of the light shield (that is, there is no region where the illuminance does not change even if the light shield is rotated). it can. Since the projection display device according to the seventh embodiment can continuously adjust the light valve irradiation light amount by the light amount adjusting means, it can continue to display an image with sufficient contrast.

  Note that the second condition can also be applied to the case where the light shields are above and below the second lens array 22 (including the case of FIG. 22). In that case, the position of the side in the x-axis direction when the light-shielding body is rotated and the side is in the y-axis direction is the range in the x-axis direction in which the light opaque region exists. Arrange them so that they are not.

  In the seventh embodiment, points other than the above are the same as those in the first to third embodiments.

It is a figure which shows schematically the structure of the projection type display apparatus which concerns on Embodiment 1 of this invention. FIG. 3 is a front view (seen in the z-axis direction) schematically showing the configuration and operation of the rotary light shielding portion of the first embodiment. (A) And (b) is a front view (figure seen in the z-axis direction) and a side view (figure seen in the x-axis direction) schematically showing the configuration and operation of the rotation mechanism of the first embodiment. is there. It is a figure (figure seen in the y-axis direction) which shows schematically the structure and function of the polarization conversion element of Embodiment 1. FIG. (A) And (b) is the front view (figure seen in the z-axis direction) and the side view (figure seen in the x-axis direction) which show the composition and operation of the rotation type shading part of a comparative example roughly. is there. It is a figure which shows the simulation result of the relationship between the rotation angle of the light-shielding body of the projection type display apparatus which concerns on Embodiment 1, and the relative light quantity ratio on a light valve. It is a figure which shows the simulation result of the relationship between the rotation angle of the light shielding body of the projection type display apparatus of a comparative example, and the relative light quantity ratio on a light valve. 6 is a diagram illustrating a dark region between second light source images in the vicinity of the second lens array according to Embodiment 1. FIG. It is a figure for demonstrating the effect of the projection type display apparatus which concerns on Embodiment 1. FIG. FIG. 6 is a ray tracing diagram showing that the vicinity of the first lens array and the center position of the light valve are in a conjugate relationship. It is a figure which shows the locus | trajectory of the light for demonstrating the unnecessary light which arises in a comparative example. It is a side view (figure which looked at the x-axis direction) which shows schematically the light-shielding body and rotation axis | shaft of the projection type display apparatus of a comparative example. It is a front view which shows roughly the illumination intensity nonuniformity on the light valve of the projection type display apparatus of a comparative example. It is a principal part enlarged view of FIG. FIG. 6 is a front view (seen in the z-axis direction) schematically showing the configuration and operation of a rotating light-shielding unit according to a modification of the first embodiment. It is a front view (figure seen in z-axis direction) which shows roughly the structure and operation | movement of a rotation-type light-shielding part of the projection type display apparatus which concerns on Embodiment 2 of this invention. It is a figure which shows the simulation result of the relationship between the rotation angle of the light-shielding body of the projection type display apparatus which concerns on Embodiment 2, and the relative light quantity ratio on a light valve. It is a front view (figure seen in z-axis direction) which shows roughly composition and operation of a rotation type shading part of a projection type display of other examples. It is a figure which shows the simulation result of the relationship between the rotation angle of the light-shielding body of the projection type display apparatus of the example of FIG. 18, and the relative light quantity ratio on a light valve. In Embodiment 2 and 6, it is a front view (figure seen in the z-axis direction) which shows an unpreferable rotation axis position when arrange | positioning in the position which shifted the rotation axis to the y-axis direction. FIG. 10 is a front view (a diagram viewed in the z-axis direction) schematically showing the configuration and operation of a rotary light shielding unit of a modification of the second embodiment. It is a front view (figure seen in z-axis direction) which shows roughly the structure and operation | movement of a rotation-type light-shielding part of the projection type display apparatus which concerns on Embodiment 3 of this invention. In Embodiment 3 and 7, it is a top view (figure seen in the y-axis direction) which shows an unpreferable rotation axis position when arrange | positioning in the position which shifted the rotation axis to the x-axis direction. It is a schematic perspective view which shows a part of polarization conversion element of FIG. In Embodiment 3 and 7, it is a figure which shows the range where it is preferable not to arrange | position a rotating shaft position. It is a front view (figure seen in z-axis direction) which shows roughly the structure and operation | movement of a rotation-type light-shielding part of the projection type display apparatus which concerns on Embodiment 4 of this invention. It is a figure which shows the simulation result of the relationship between the rotation angle of the light-shielding body of the projection type display apparatus which concerns on Embodiment 4, and the relative light quantity ratio on a light valve. It is a figure which shows schematically the structure of the projection type display apparatus which concerns on Embodiment 5 of this invention. It is a front view (figure seen in z-axis direction) which shows roughly the structure and operation | movement of the rotation-type light-shielding part of Embodiment 5. It is a figure which shows the simulation result of the relationship between the rotation angle of the light-shielding body of the projection type display apparatus which concerns on Embodiment 5, and the relative light quantity ratio on a light valve. FIG. 10 is a front view (seen in the z-axis direction) schematically showing the configuration and operation of a rotary light shielding unit of a modification of the fifth embodiment.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 Light source system, 2 Integrator optical system, 3 Polarization conversion element, 4 Condenser lens, 5 Field lens, 6 Polarizing plate, 7 Light valve, 8 Projection optical system, 9,126 Light quantity adjustment means, 11 Light source, 12 Reflector, 21 First lens array, 22 Second lens array, 31 Polarization separation film, 32 Reflective film, 33 λ / 2 phase difference plate, 91, 121 to 126, 128, 129 Rotating light shielding part, 91L, 91R, 91T , 91B, 91L2, 91R2, 128L, 128R light shielding body, 91LA, 91RA, 91L2A, 91R2A, 91TA, 91BA, 128LA, 128RA, rotating shaft, 91LB, 91RB, 91L2B, 91R2B The top side of the body rotation direction, 92 rotation mechanism, 9 Rotation control unit 94 signal detection unit, 95 motor, 95a, 96, 96a, 97 gears, 101 and 105 a projection type display apparatus, 201-204 dark regions between the second light source image, AX optical axis, SC screen.

Claims (5)

In an xyz coordinate system comprising a z-axis that coincides with the optical axis, an x-axis that is orthogonal to the z-axis, and a y-axis that is orthogonal to both the z-axis and the x-axis, wherein the optical axis is the origin of the xy plane,
A light source system that emits light;
Arranging convex lenses having a shape on the first plane orthogonal to the z-axis and having a long side in the x-axis direction and a short side in the y-axis direction in a plurality of rows and a plurality of columns on the first plane. A first lens array configured to equalize an illuminance distribution of the light emitted from the light source system;
Arranging convex lenses having a shape on the second plane perpendicular to the z-axis and having a long side in the x-axis direction and a short side in the y-axis direction in a plurality of rows and a plurality of columns on the second plane. Each convex lens of the first lens array is disposed at a position spaced from the first lens array so as to face each convex lens of the second lens array, and the first lens array A second lens array for uniformizing the illuminance distribution of the light transmitted through
A light valve that is irradiated with light transmitted through the second lens array and outputs light modulated in accordance with a video signal;
A projection optical system that projects the light output from the light valve onto a screen;
A projection-type display device, comprising: a light amount adjusting unit that is disposed between the first lens array and the second lens array and adjusts a light amount of light applied to the light valve;
The light amount adjusting means is
A pair or a plurality of pairs of light shields for shielding light from the first lens array toward the second lens array;
One or a plurality of pairs of rotation shafts for rotatably supporting each of the light shielding bodies on an xy plane;
A rotation mechanism for rotating the light shielding body;
A rotation control unit for controlling the operation of the rotation mechanism,
The xy coordinates of the pair of the light shielding bodies among the one or a plurality of pairs of the light shielding bodies are symmetric about the origin.
The xy coordinates of the pair of rotation shafts among the one or plural pairs of the rotation shafts are symmetric about the origin.
The side that becomes the head in the rotational direction of the light shielding body when rotating in the direction of increasing the light shielding amount by the light shielding body is a straight tip linear portion,
The light shielding body and the rotation shaft are arranged so that the light shielding body starts to shield light directed toward the second lens array by the rotation, and then the light shielding body is moved to the first position after the light shielding start position of the light shielding body is turned. In the middle of the rotation of the light shielding body before reaching the maximum light shielding position of the light shielding body that shields the most light toward the second lens array, the straight end portion of the tip is the first lens array and the The projection type display device, wherein the projection type display device is disposed so as to pass through an inclined posture with respect to both the long side and the short side of the second lens array.   The projection display device according to claim 1, wherein the shape of the light blocking body on the xy plane is a quadrangle.   The pair of light shielding bodies and the pair of rotating shafts are arranged such that, when each of the pair of light shielding bodies is at the maximum light shielding position, the sides of the light shielding bodies that form a pair are at the heads in the rotation direction. Or the pair of light shields are arranged so as to be displaced in the z-axis direction, and the tip straight portions of the pair of light shields are configured to overlap each other. The projection display device according to claim 1 or 2. A signal detection unit that calculates a relative light quantity ratio that is larger as the average luminance of the video signal is higher when the video signal is input;
The said rotation control part controls the operation | movement of the said rotation mechanism so that the light shielding amount by the said light shielding body may be increased, so that the calculated relative light quantity ratio is low. A projection display device according to claim 1.   5. The device according to claim 1, wherein the rotary light shielding portion is disposed closer to the second lens array than an intermediate position between the first lens array and the second lens array. The projection type display device described.

Images