JP2019120720A - Image projection device, image projection method, and image projection program - Google Patents

Abstract

[PROBLEMS] To reduce power consumption and shorten the time required for pixel shift movement to be stabilized when displaying a high-resolution projected image. A fixed unit that is fixedly supported, a movable unit that has an image display element and is movable with respect to the fixed unit, a movement control unit that controls movement of the movable unit, and a movable unit by the movement control unit Is an image control unit that increases the number of pixels on the projected image by generating an image on the image display element according to the position of the image display element, and when there is no input of a video signal, or projection When not performing, the image control part which changes operation | movement of a movable unit to operation | movement slower than the time of the projection accompanied by high resolution is provided. [Selection] Figure 18

Description

  The present invention relates to an image projection apparatus, an image projection method, and an image projection program.

The image generation unit generates an image using light emitted from the light source based on image data transmitted from a personal computer, a digital camera or the like, and the generated image is displayed on a screen etc. through an optical system including a plurality of lenses etc. An image projection apparatus for projecting an image is known. As the image generation unit, for example, a liquid crystal panel, a digital micromirror device DMD (Digital Micromirror Device), or the like is used.
As such an image projection apparatus, there is a projector capable of increasing the resolution of a projection image by pixel shift (see, for example, Patent Document 1). Patent Document 1 describes stopping pixel shifting when the light source is turned off and starting pixel shifting after the light source is turned on.

However, according to Patent Document 1, when transitioning from a completely stopped state of pixel shifting to a running state after turning on the light source, it takes some time for the movement of the pixel shifting to become stable, so the resolution is increased unstably. There is a problem that the projected image is displayed on the screen. If, in order to solve this problem, pixel shifting is performed in the same way as when the light source is turned off, even when the light source is turned off, the projected image with high resolution is unstable when the light source is turned on. Can solve the problem of being displayed on However, when the light source is turned off, the wasteful power consumption for shifting the pixels is increased.
That is, when the movement of the pixel shift is completely stopped, it takes a lot of time until the movement necessary for the high resolution is stabilized. On the other hand, if the pixel shift motion is moved at a low speed, the time required to return to the motion required for high resolution is small compared to when the motion is completely stopped. Therefore, there has been a demand for a technology that can reduce the power consumption and shorten the time required for the movement of the pixel shift to be stabilized at the time of display of a high resolution projection image.

  The present invention has been made in view of the above, and it is intended to reduce the power consumption while shortening the time required for the movement of the pixel shift to be stabilized at the time of display of a high resolution projected image. It is an object of the present invention to provide an image projector capable of

  According to the image projection apparatus of the present invention, the movable unit having the fixed unit supported in a fixed manner and the image display element and movable with respect to the fixed unit, and the movement control unit controlling the movement of the movable unit And an image control unit configured to move the movable unit by the movement control unit and generate an image on the image display element according to the position of the image display element to thereby increase the resolution of the number of pixels on a projected image. And an image control unit configured to change the operation of the movable unit to a slower operation than the projection accompanied with the high resolution when there is no input of a video signal or when projection is not performed.

  According to the present invention, it is possible to reduce the power consumption and to shorten the time required for the movement of the pixel shift to be stabilized at the time of display of the high resolution projection image.

It is a figure which illustrates the image projector in an embodiment. It is a block diagram which illustrates the functional composition of the picture projection device in an embodiment. It is a perspective view which illustrates the optical engine of the image projector in an embodiment. It is a figure which illustrates the illumination optical system unit in an embodiment. It is a figure which illustrates the internal configuration of the projection optical system unit in an embodiment. It is a perspective view which illustrates the image display unit in an embodiment. It is a side view which illustrates the image display unit in an embodiment. It is a perspective view which illustrates a fixed unit in an embodiment. It is an exploded perspective view which illustrates the fixed unit in an embodiment. It is a figure explaining the support structure of the movable plate by the fixed unit in an embodiment. It is the elements on larger scale explaining the support structure of the movable plate by the fixed unit in an embodiment. It is a bottom view which illustrates the top cover in an embodiment. It is a perspective view which illustrates a movable unit in an embodiment. It is an exploded perspective view which illustrates a movable unit in an embodiment. It is a perspective view which illustrates a movable plate in an embodiment. It is a perspective view which illustrates the movable unit in which the movable plate in an embodiment was removed. It is explanatory drawing which showed the image of the display state of the pixel which shifted by half pixel by pixel shift in embodiment. It is explanatory drawing about the processing flow by the presence or absence of the video input signal in embodiment. It is explanatory drawing about the processing flow when a mute function is performed during execution of the resolution enhancement process in embodiment. It is explanatory drawing about the case where the special operation mode in embodiment is made into a low-speed drive rather than the time of the projection of high resolution. It is an explanatory view about a case where a special operation mode in an embodiment is circular motion. It is explanatory drawing about the case where the special operation mode in embodiment is elliptical motion.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the drawings, the same components are denoted by the same reference numerals, and redundant description may be omitted. Also, although the following description is given on the premise of projecting an image, the projection includes projection.

<Configuration of Image Projection Apparatus>
FIG. 1 is a diagram illustrating a projector 1 in the embodiment.
The projector 1 is an example of an image projector, includes an emission window 3 and an external I / F 9, and an optical engine that generates a projection image is provided inside. For example, when image data is transmitted from a personal computer or digital camera connected to the external I / F 9, the projector 1 generates a projected image based on the image data transmitted by the optical engine, as shown in FIG. The image P is projected onto the screen S from the exit window 3.
In the drawings shown below, the X1 X2 direction is the width direction of the projector 1, the Y1 Y2 direction is the depth direction of the projector 1, and the Z1 Z2 direction is the height direction of the projector 1. Also, in the following description, the exit window 3 side of the projector 1 may be described as the upper side, and the opposite side to the output window 3 may be described as the lower side.

FIG. 2 is a block diagram illustrating the functional configuration of the projector 1 in the embodiment.
As shown in FIG. 2, the projector 1 includes a power supply 4, a main switch SW 5, an operation unit 7, an external I / F 9, a system control unit 10, a fan 20, and an optical engine 15.
The power supply 4 is connected to a commercial power supply, converts voltage and frequency for the internal circuit of the projector 1, and supplies power to the system control unit 10, the fan 20, the optical engine 15, and the like.
The main switch SW5 is used for ON / OFF operation of the projector 1 by the user. When the main switch SW5 is operated to ON while the power supply 4 is connected to a commercial power source via a power cord or the like, the power supply 4 starts supplying power to each part of the projector 1, and the main switch SW5 is operated to OFF Then, the power supply 4 stops supplying power to each part of the projector 1.
The operation unit 7 is a button or the like that receives various operations by the user, and is provided, for example, on the upper surface of the projector 1. The operation unit 7 receives, for example, an operation by the user such as the size of the projection image, the color tone, and the focus adjustment. The user operation accepted by the operation unit 7 is sent to the system control unit 10.

The external I / F 9 has a connection terminal connected to, for example, a personal computer, a digital camera, etc., and outputs image data transmitted from the connected device to the system control unit 10.
The system control unit 10 includes an image control unit 11 and a movement control unit 12. The image control unit 11 further includes a pixel shifting image processing unit 111. The system control unit 10 includes, for example, a CPU, a ROM, a RAM, and the like included in an information processing apparatus such as a computer, and the CPU cooperates with the RAM to execute the programs stored in the ROM. To be realized.
The image control unit 11 is an example of an image control unit, and is a digital micromirror device DMD (Digital Micromirror Device (DMD) provided in the image display unit 50 of the optical engine 15 based on image data input from the external I / F 9. Hereinafter, it simply controls "DMD") 551 to generate an image to be projected on the screen S.

The pixel shifting image processing unit 111 generates a video for two frames shifted by half a pixel for pixel shifting from one frame of the input video. Specific processing performed by the pixel shifting image processing unit 111 will be described later with reference to FIG. 17 and subsequent drawings.
The movement control unit 12 is an example of a movement control unit, moves the movable unit 55 provided movably in the image display unit 50, and controls the position of the DMD 551 provided in the movable unit 55.

The fan 20 is controlled by the system control unit 10 to rotate and cool the light source 30 of the optical engine 15.
The optical engine 15 has a light source 30, an illumination optical system unit 40, an image display unit 50, and a projection optical system unit 60, and is controlled by the system control unit 10 to project an image on the screen S.
The light source 30 is, for example, a mercury high-pressure lamp, a xenon lamp, an LED or the like, and is controlled by the system control unit 10 to irradiate the illumination optical system unit 40 with light.
The illumination optical system unit 40 has, for example, a color wheel, a light tunnel, a relay lens, etc., and guides the light emitted from the light source 30 to the DMD 551 provided in the image display unit 50.

The image display unit 50 has a fixed unit 51 that is fixed and supported, and a movable unit 55 that is provided so as to be movable relative to the fixed unit 51. The movable unit 55 has a DMD 551, and the position of the fixed unit 51 is controlled by the movement control unit 12 of the system control unit 10. The DMD 551 is an example of an image generation unit, and is controlled by the image control unit 11 of the system control unit 10, and modulates the light guided by the illumination optical system unit 40 to generate a projection image.
The projection optical system unit 60 has, for example, a plurality of projection lenses, mirrors, etc., and magnifies and projects the image generated by the DMD 551 of the image display unit 50 on the screen S.

<Structure of Optical Engine>
Next, the configuration of each part of the optical engine 15 of the projector 1 will be described.
FIG. 3 is a perspective view illustrating the optical engine 15 in the embodiment. The optical engine 15 includes a light source 30, an illumination optical system unit 40, an image display unit 50, and a projection optical system unit 60 as shown in FIG. 3 and is provided in the projector 1.
The light source 30 is provided on the side surface of the illumination optical system unit 40, and emits light in the X2 direction. The illumination optical system unit 40 guides the light emitted from the light source 30 to the image display unit 50 provided below. The image display unit 50 uses the light guided by the illumination optical system unit 40 to generate a projection image. The projection optical system unit 60 is provided above the illumination optical system unit 40 and projects the projection image generated by the image display unit 50 to the outside of the projector 1.
In addition, although the optical engine 15 which concerns on this embodiment is comprised so that an image may be projected upward using the light irradiated from the light source 30, even if it is a structure which projects an image horizontally. Good.

[Illumination optics unit]
FIG. 4 is a diagram illustrating the illumination optical system unit 40 in the embodiment.
As shown in FIG. 4, the illumination optical system unit 40 includes a color wheel 401, a light tunnel 402, relay lenses 403 and 404, a cylinder mirror 405, and a concave mirror 406.
The color wheel 401 is, for example, a disk in which filters of respective colors of R (red), G (green), and B (blue) are provided at different portions in the circumferential direction. The color wheel 401 rotates at high speed to time-share the light emitted from the light source 30 into each color of RGB.
The light tunnel 402 is formed in, for example, a square cylindrical shape by bonding plate glass or the like. The light tunnel 402 equalizes the luminance distribution by multiple-reflecting the light of each color of RGB transmitted through the color wheel 401 on the inner surface, and guides the light distribution to the relay lenses 403 and 404.
The relay lenses 403 and 404 collect light while correcting axial chromatic aberration of the light emitted from the light tunnel 402.
The cylinder mirror 405 and the concave mirror 406 reflect the light emitted from the relay lenses 403 and 404 to the DMD 551 provided in the image display unit 50. The DMD 551 modulates the reflected light from the concave mirror 406 to generate a projected image.

[Projection optical system unit]
FIG. 5 is a diagram illustrating an internal configuration of the projection optical system unit 60 in the embodiment.
As shown in FIG. 5, in the projection optical system unit 60, a projection lens 601, a folding mirror 602, and a curved mirror 603 are provided inside the case.
The projection lens 601 has a plurality of lenses, and forms a projected image generated by the DMD 551 of the image display unit 50 on the folding mirror 602. The folding mirror 602 and the curved mirror 603 reflect the formed projection image so as to magnify it, and project it on a screen S or the like outside the projector 1.

[Image display unit]
FIG. 6 is a perspective view illustrating the image display unit 50 in the embodiment. FIG. 7 is a side view illustrating the image display unit 50 in the embodiment.
As shown in FIGS. 6 and 7, the image display unit 50 includes a fixed unit 51 that is fixed and supported, and a movable unit 55 that is movably provided relative to the fixed unit 51.
The fixing unit 51 includes a top plate 511 as a first fixing plate and a base plate 512 as a second fixing plate. The fixing unit 51 is provided in parallel with the top plate 511 and the base plate 512 via a predetermined gap, and is fixed to the lower part of the illumination optical system unit 40.
The movable unit 55 includes a DMD 551, a movable plate 552 as a first movable plate, a coupling plate 553 as a second movable plate, and a heat sink 554, and is movably supported by the fixed unit 51.

The movable plate 552 is provided between the top plate 511 of the fixed unit 51 and the base plate 512, and is supported movably by the fixed unit 51 in a direction parallel to the top plate 511 and the base plate 512 and parallel to the surface.
The coupling plate 553 is fixed to the movable plate 552 with the base plate 512 of the fixed unit 51 interposed therebetween. In the coupling plate 553, the DMD 551 is fixed on the upper surface side, and the heat sink 554 is fixed on the lower surface side. The coupling plate 553 is fixed to the movable plate 552 so as to be movably supported by the fixed unit 51 together with the movable plate 552, the DMD 551, and the heat sink 554.

The DMD 551 is provided on the surface of the coupling plate 553 on the movable plate 552 side, and is movably provided together with the movable plate 552 and the coupling plate 553. The DMD 551 has an image generation surface in which a plurality of movable micro mirrors are arranged in a grid. A mirror surface of each micro mirror of the DMD 551 is tiltable around a twist axis, and is turned on / off based on an image signal transmitted from the image control unit 11 of the system control unit 10.
For example, when the micro mirror is “ON”, the tilt angle is controlled to reflect the light from the light source 30 to the projection optical system unit 60. Further, for example, in the case of “OFF”, the micro mirror has its inclination angle controlled in the direction of reflecting the light from the light source 30 toward the OFF light plate (not shown).
As described above, the DMD 551 controls the tilt angle of each micro mirror by the image signal transmitted from the image control unit 11 and modulates the light transmitted from the light source unit 30 and transmitted through the illumination optical system unit 40 to generate a projected image. Generate

  The heat sink 554 is an example of a heat dissipation means, and at least a part thereof is provided to abut on the DMD 551. The heat sink 554 is provided on the movably supported coupling plate 553 together with the DMD 551 so that it can contact the DMD 551 for efficient cooling. With such a configuration, in the projector 1 according to the present embodiment, the heat sink 554 suppresses the temperature rise of the DMD 551, and the occurrence of defects such as malfunction or failure due to the temperature rise of the DMD 551 is reduced.

(Fixed unit)
FIG. 8 is a perspective view illustrating the fixing unit 51 in the embodiment. FIG. 9 is an exploded perspective view illustrating the fixing unit 51 in the embodiment.
As shown in FIGS. 8 and 9, the fixing unit 51 has a top plate 511 and a base plate 512.
The top plate 511 and the base plate 512 are formed of flat members, and central holes 513 and 514 are provided at positions corresponding to the DMD 551 of the movable unit 55, respectively. Further, the top plate 511 and the base plate 512 are provided in parallel by a plurality of support columns 515 via a predetermined gap.
The post 515 is press-fit into a post hole 516 whose upper end is formed in the top plate 511, as shown in FIG. Inserted into The support 515 forms a constant distance between the top plate 511 and the base plate 512, and supports the top plate 511 and the base plate 512 in parallel.

Further, in the top plate 511 and the base plate 512, a plurality of support holes 522 and 526 for holding the support sphere 521 rotatably are formed respectively.
A cylindrical holding member 523 having a female screw groove on the inner circumferential surface is inserted into the support hole 522 of the top plate 511. The holding member 523 rotatably holds the support sphere 521, and the position adjustment screw 524 is inserted from above. The lower end side of the support hole 526 of the base plate 512 is closed by the lid member 527, and the support sphere 521 is rotatably held.
The support spheres 521 rotatably held in the support holes 522 and 526 of the top plate 511 and the base plate 512 respectively abut the movable plate 552 provided between the top plate 511 and the base plate 512, and can move the movable plate 552 To support.

FIG. 10 is a view for explaining a support structure of the movable plate 552 by the fixed unit 51 in the embodiment. 11 is a partially enlarged view illustrating the schematic configuration of the portion A shown in FIG.
As shown in FIGS. 10 and 11, in the top plate 511, the support sphere 521 is rotatably held by a holding member 523 inserted into the support hole 522. Further, in the base plate 512, the support sphere 521 is rotatably held by the support hole 526 whose lower end side is closed by the lid member 527.
Each support sphere 521 is held so that at least a portion thereof protrudes from the support holes 522 and 526, and abuts on and supports the movable plate 552 provided between the top plate 511 and the base plate 512. The movable plate 552 is movably supported in a direction parallel to the top plate 511 and the base plate 512 and in a direction parallel to the surface by a plurality of support balls 521 rotatably provided.

Further, the amount of protrusion of the support sphere 521 provided on the top plate 511 side from the lower end of the holding member 523 changes according to the position of the position adjustment screw 524 that abuts on the opposite side to the movable plate 552. For example, when the position adjustment screw 524 is displaced in the Z1 direction, the amount of protrusion of the support sphere 521 is reduced, and the distance between the top plate 511 and the movable plate 552 is reduced. Also, for example, when the position adjustment screw 524 is displaced in the Z2 direction, the amount of protrusion of the support sphere 521 is increased, and the distance between the top plate 511 and the movable plate 552 is increased.
Thus, the distance between the top plate 511 and the movable plate 552 can be appropriately adjusted by changing the amount of protrusion of the support sphere 521 using the position adjustment screw 524.
Further, as shown in FIG. 8 and FIG. 9, magnets 531, 532, 533, 534 are provided on the surface of the top plate 511 on the base plate 512 side.

FIG. 12 is a bottom view illustrating the top plate 511 in the embodiment. As shown in FIG. 12, magnets 531, 532, 533, 534 are provided on the surface of the top plate 511 on the base plate 512 side.
The magnets 531 532 533 534 are provided at four locations so as to surround the central hole 513 of the top plate 511. The magnets 531, 532, 533, 534 are formed of two rectangular parallelepiped magnets arranged so that their longitudinal directions are parallel to each other, and form magnetic fields extending to the movable plate 552, respectively.
The magnets 531 532 533 534 form moving means for moving the movable plate 552 with coils provided on the upper surface of the movable plate 552 so as to face the magnets 531 533 534, respectively.
The number, positions, and the like of the support 515 and the support spheres 521 provided in the fixed unit 51 described above may be movably supported by the movable plate 552 and is not limited to the configuration exemplified in the present embodiment.

(Movable unit)
FIG. 13 is a perspective view illustrating the movable unit 55 in the embodiment. FIG. 14 is an exploded perspective view illustrating the movable unit 55 in the embodiment.
As shown in FIGS. 13 and 14, the movable unit 55 includes a DMD 551, a movable plate 552, a coupling plate 553, a heat sink 554, a holding member 555, and a DMD substrate 557. It is done.
As described above, the movable plate 552 is provided between the top plate 511 and the base plate 512 of the fixed unit 51, and can be moved between the top plate 511 and the base plate 512 with respect to the fixed unit by the plurality of support spheres 521. Supported by

FIG. 15 is a perspective view illustrating the movable plate 552 in the embodiment.
As shown in FIG. 15, movable plate 552 is formed of a flat plate-like member and has central hole 570 at a position corresponding to DMD 551 provided on DMD substrate 557, and coils 581, 582 around central hole 570. , 583, 584 are provided.
The coils 581, 582, 583, and 584 are each formed by winding an electric wire around an axis parallel to the Z1 Z2 direction, and provided in a recess formed on the surface of the movable plate 552 on the top plate 511 side. It is covered with a cover. The coils 581, 582, 583 and 584, together with the magnets 531, 532, 533 and 534 of the top plate 511, constitute moving means for moving the movable plate 552.
The magnets 531, 532, 533, 534 of the top plate 511 and the coils 581, 582, 583, 584 of the movable plate 552 are provided at opposing positions in a state where the movable unit 55 is supported by the fixed unit 51. ing. When current flows through the coils 581, 582, 583, 584, Lorentz force, which is a driving force for moving the movable plate 552, is generated by the magnetic field formed by the magnets 531, 532, 533, 534.

Movable plate 552 receives Lorentz force as a driving force generated between magnets 531, 532, 533, 534 and coils 581, 582, 583, 584, and linearly moves in the XY plane with respect to fixed unit 51. Or displace to rotate.
The magnitude and direction of the current supplied to each coil 581, 582, 583, 584 is controlled by the movement control unit 12 of the system control unit 10. The movement control unit 12 controls the movement (rotation) direction, movement amount, rotation angle, and the like of the movable plate 552 according to the magnitude and direction of the current supplied to each of the coils 581, 582, 583, and 584.

  In the present embodiment, as the first driving means, a coil 581 and a magnet 531, a coil 584 and a magnet 534 are provided to be opposed in the X1X2 direction. When current is applied to the coils 581 and 584, Lorentz force in the X1 direction or X2 is generated as shown in FIG. The movable plate 552 moves in the X1 direction or the X2 direction by the Lorentz force generated in the coil 581 and the magnet 531, and the coil 584 and the magnet 534.

  Further, in the present embodiment, as the second drive means, the coil 582 and the magnet 532 and the coil 583 and the magnet 533 are provided side by side in the X1X2 direction, and the magnet 532 and the magnet 533 are the magnets 531 and 534 The longitudinal directions are arranged to be orthogonal to each other. In such a configuration, when current is applied to the coils 582 and 583, Lorentz force in the Y1 direction or Y2 direction is generated as shown in FIG.

The movable plate 552 moves in the Y1 direction or the Y2 direction by the Lorentz force generated in the coil 582, the magnet 532 and the coil 583 and the magnet 533. Further, the movable plate 552 is displaced to rotate in the XY plane by Lorentz force generated in the opposite direction by the coil 582 and the magnet 532 and the coil 583 and the magnet 533.
For example, when a current is supplied such that a Lorentz force in the Y1 direction is generated in the coil 582 and the magnet 532 and a Lorentz force in the Y2 direction is generated in the coil 583 and the magnet 533, the movable plate 552 rotates clockwise in top view Displace to rotate. In addition, when current flows such that Lorentz force in Y2 direction is generated in coil 582 and magnet 532 and Lorentz force in Y1 direction is generated in coil 583 and magnet 533, movable plate 552 is counterclockwise in top view Displace to rotate in the direction.

Further, a movable range restriction hole 571 is provided in the movable plate 552 at a position corresponding to the support 515 of the fixed unit 51. The movable range limiting hole 571 limits the movable range of the movable plate 552 by inserting the column 515 of the fixed unit 51 and contacting the column 515 when the movable plate 552 moves largely due to, for example, vibration or some abnormality.
As described above, in the present embodiment, the movement control unit 12 of the system control unit 10 controls the magnitude and direction of the current supplied to the coils 581, 582, 583, and 584 to move the movable plate within the movable range. 552 can be moved to any position.

  The number, positions, etc. of the magnets 531, 532, 533, 534 and the coils 581, 582, 583, 584 as moving means are not limited to the present embodiment, provided that the movable plate 552 can be moved to any position. It may have a different configuration. For example, the magnet as the moving means may be provided on the top surface of the top plate 511 or may be provided on any surface of the base plate 512. Also, for example, a magnet may be provided on the movable plate 552, and a coil may be provided on the top plate 511 or the base plate 512.

Further, the number, the position, the shape, and the like of the movable range limiting holes 571 are not limited to the configuration exemplified in the present embodiment. For example, the movable range limiting hole 571 may be single or plural. Further, the shape of the movable range limiting hole 571 may be a shape different from the present embodiment, such as a rectangle or a circle.
As shown in FIG. 13, a coupling plate 553 is fixed to the lower surface side (the base plate 512 side) of the movable plate 552 movably supported by the fixed unit 51. The coupling plate 553 is formed of a flat plate-like member, has a central hole at a position corresponding to the DMD 551, and a bent portion provided on the periphery is fixed to the lower surface of the movable plate 552 by three screws 591.

FIG. 16 is a perspective view illustrating the movable unit 55 from which the movable plate 552 is removed.
As shown in FIG. 16, the coupling plate 553 is provided with a DMD 551 on the upper surface side and a heat sink 554 on the lower surface side. The coupling plate 553 is fixed to the movable plate 552 so as to be movable with respect to the fixed unit 51 along with the movable plate 552 together with the DMD 551 and the heat sink 554.
The DMD 551 is provided on the DMD substrate 557, and is fixed to the coupling plate 553 by sandwiching the DMD substrate 557 between the holding member 555 and the coupling plate 553. As shown in FIGS. 14 and 16, the holding member 555, the DMD substrate 557, the coupling plate 553, and the heat sink 554 are overlapped and fixed by a stepped screw 560 as a fixing member and a spring 561 as a pressing unit.

Image projection
As described above, in the projector 1 according to the present embodiment, the DMD 551 that generates a projection image is provided in the movable unit 55, and the position is controlled together with the movable unit 55 by the movement control unit 12 of the system control unit 10. .
The movement control unit 12 moves the movable unit 55 so as to move at a high speed between a plurality of positions separated by a distance less than the arrangement interval of the plurality of micro mirrors of the DMD 551, for example, at a predetermined cycle corresponding to the frame rate Control the position of At this time, the image control unit 11 transmits an image signal to the DMD 551 so as to generate a projection image shifted according to each position.

For example, the movement control unit 12 reciprocates the DMD 55 at a predetermined cycle between the position P1 and the position P2 separated by a distance less than the arrangement interval of the micro mirrors of the DMD 551 in the X1X2 direction and the Y1Y2 direction. At this time, by controlling the DMD 551 so that the image control unit 11 generates a projected image shifted according to each position, the resolution of the projected image can be made approximately twice the resolution of the DMD 551. Become. Further, by increasing the moving position of the DMD 551, the resolution of the projected image can be made twice or more that of the DMD 551.
As described above, the movement control unit 12 moves the DMD 551 together with the movable unit 55 at a predetermined cycle, and the image control unit 11 causes the DMD 551 to generate a projection image according to the position, thereby projecting an image higher than the resolution of the DMD 551. It becomes possible.
Further, in the projector 1 according to the present embodiment, the movement control unit 12 controls the DMD 551 to rotate together with the movable unit 55, so that the projection image can be rotated without being reduced. For example, in a projector in which an image generation unit such as the DMD 551 is fixed, the projector can not be rotated while maintaining the aspect ratio of the projection image unless the projection image is reduced. On the other hand, in the projector 1 according to the present embodiment, since the DMD 551 can be rotated, it is possible to rotate and adjust the inclination and the like without reducing the projection image.

As described above, in the projector 1, the movable unit 55 including the DMD 551 can be arbitrarily moved in accordance with the direction and the magnitude of the current, but hereinafter, in the resolution increasing processing by the pixel shifting technique by the image control unit 11. Explain the reduction of power consumption.
As described below, in the image control unit 11 of the system control unit 10 in the present embodiment, for example, when the pixel shift image processing unit 111 determines that the projection signal is not input or in the non-signal state, or When the mute function which does not perform projection by temporarily erasing the projection image is performed by the operation, the operation of the image display element is switched to the special operation. The special operation is an operation performed by the movable unit, which is different from the operation at the time of projection with the resolution increasing function. As a method of providing the pixel shift image processing unit 11, a programmable logic device (PLD: Programmable Logic Device) such as an FPGA (Field-Programmable Gate Array) is provided, and a bit stream is provided together with the image display element unit 30. There is a method.

  As a pixel shift projection means, for example, as described in JP-A-2007-248894, a method of forming an intermediate image by shifting an optical path by a pixel shift element to increase a pixel density, JP-A-2016-085363 There is a method of realizing high resolution by driving the DMD 551 itself as described in the publication. The following description will be made on the premise of the latter method, but the same control can also achieve the same effect in a method for achieving high resolution by shifting the optical path.

(Pixel shift (DMD shift))
As described above, the DMD 551 that generates a projection image in the projector 1 is provided in the movable unit 55, and the movement control unit 12 controls the position together with the movable unit 55.
The movement control unit 12 moves the movable unit 55 so as to move at a high speed between a plurality of positions separated by a distance less than the arrangement interval of the plurality of micro mirrors of the DMD 551, for example, at a predetermined cycle corresponding to the frame rate Control the position of At this time, the DMD control unit 13 transmits an image signal to the DMD 551 so as to generate a projection image shifted according to each position.

The movement control unit 12 reciprocates the DMD 55 at a predetermined cycle between a position A and a position B separated by a distance less than the arrangement interval of micro mirrors of the DMD 551 in the X1X2 direction and the Y1Y2 direction. At this time, the pixel shift image processing unit 111 of the image control unit 11 controls the DMD 551 so that the projected image shifted according to each position is generated, so that the resolution of the projected image is about the resolution of the DMD 551. It is possible to double.
As described above, the movement control unit 12 moves the DMD 551 together with the movable unit 55 at a predetermined cycle, and the pixel shift image processing unit 111 causes the DMD 551 to generate a projection image according to the position. It becomes possible to project

FIG. 17 is an explanatory view showing an image of a display state of pixels shifted by a half pixel by pixel shift (hereinafter, also referred to as DMD shift).
FIG. 17A shows each pixel S1 in a state in which the display position is not shifted (the state before shifting, the first state), and the size of each pixel is XL × YL. FIG. 18B shows each pixel S2 in the state (second state) shifted by half a pixel (XL / 2, YL / 2). Then, by combining two images, that is, alternately projecting an image at each pixel, it is possible to increase the resolution in a pseudo manner as shown in FIG. 18 (C). As described above, by combining an image shifted by half a pixel with respect to the original image, resolution enhancement of up to about twice can be realized.

FIG. 18 is an explanatory diagram of a processing flow according to the presence or absence of a video input signal. As shown in FIG. 18, the pixel shifting image processing unit 111 of the image control unit 11 determines whether a video input signal has been received from the external I / F 9 (S100). When it is determined that the image input signal is received from the external I / F 9 (S100; Yes), the pixel shifting image processing unit 111 executes a resolution increasing process by pixel shifting (S101). On the other hand, when the pixel shift image processing unit 111 determines that the video input signal is not received from the external I / F 9 (S100; No), the video element is operated in the special operation mode (S102).
As described above, when there is no video signal, power consumption can be reduced by operating the video element in the special operation mode.

FIG. 19 is an explanatory diagram of a processing flow when the mute function is executed while the resolution increasing process is being performed. As shown in FIG. 19, the pixel shift image processing unit 111 of the image control unit 11 determines whether a signal indicating that the mute function has been executed is received from the external I / F 9 (S200), If it is determined that a signal indicating that the mute function has been executed is received from the I / F 9 (S200; Yes), the video element is operated in the special operation mode (S201). On the other hand, when the pixel shifting image processing unit 111 determines that the external I / F 9 has not received a signal indicating that the mute function has been executed (S200 returns No), the process is ended without doing anything.
After operating in the special operation mode, the pixel shifting image processing unit 111 determines whether a signal indicating that the mute function has ended is received (S202). When the pixel shifting image processing unit 111 determines that the signal indicating that the mute function is finished is received (S202; Yes), the special operation mode of the video element is finished and the resolution increasing process is executed (S203). ), End the process. On the other hand, when the pixel shifting image processing unit 111 determines that the signal indicating that the muting function has ended is not received (S202; No), the pixel shifting image processing unit 111 stands by.

  As described above, when the mute function is performed and the projected image is extinguished, power consumption can be reduced by operating the video element in the special operation mode. Although FIGS. 18 and 19 illustrate the presence or absence of the video input signal and the presence or absence of the signal indicating that the mute function has been executed, the signal indicating that the light source 30 is turned off is assumed as if the projection is not performed. The same applies to the case of the presence or absence of. For example, when the pixel shift image processing unit 111 receives an extinguishing signal of the light source 30, it may recognize that projection is not performed, and may operate the video element in the special mode described above.

  FIG. 20 is an explanatory view of a case where the special operation mode is driven at a lower speed than at the time of high resolution projection. As shown in FIG. 20, during normal projection, the pixel shift image processing unit 111 of the image control unit 11 shifts the DMD 551 which is an image display element, for example, by half a pixel in a 45 ° diagonal direction at 60 Hz. The projected image is enhanced in resolution (FIG. 20 left). However, when operating in the special operation mode described above, the pixel shifting image processing unit 111 moves the image display element with linear motion at a low frequency such as 1 Hz, for example. In linear motion, the traveling direction and the inertial force are reversed 180 ° at the top of the trajectory, resulting in a large load on the driving force. However, by moving at a low frequency, the inertial force is also reduced, so the load on the driving force is reduced by the amount of moving at a low frequency, and power consumption can be reduced.

  FIG. 21 is an explanatory view of a case where the special operation mode is circular motion. As shown in FIG. 21, the pixel shift image processing unit 111 of the image control unit 11 shifts the DMD 551 which is an image display element, for example, by half a pixel in a 45 ° diagonal direction at 60 Hz during normal projection. The projected image is enhanced in resolution (FIG. 21 left). However, when operating in the special operation mode described above, the pixel shifting image processing unit 111 moves the image display element in a low frequency circular motion such as 1 Hz, for example. By moving in low-speed circular motion, the inertial force is almost eliminated, so power consumption can be reduced more than in linear motion.

  FIG. 22 is an explanatory view of a case where the special operation mode is an elliptical motion. As shown in FIG. 22, during normal projection, the pixel shift image processing unit 111 of the image control unit 11 shifts the DMD 551 which is an image display element, for example, by half a pixel in a 45 ° diagonal direction at 60 Hz. The projected image is enhanced in resolution (FIG. 22 left). However, in the case of operating in the special operation mode described above, the pixel shifting image processing unit 111 moves the image display element with a low frequency elliptic motion such as 1 Hz, for example. Power consumption can be reduced because the inertial force is almost eliminated by moving with low speed elliptical motion. Also, when returning to linear motion in normal operation, it is possible to return in a short time since it is close to linear motion as compared to circular motion.

As described above, in the projector 1 shown in the present embodiment, the pixel shift image processing unit 111 of the image control unit 11 operates the movable unit when the light source is off, when the projection mute is performed, or when the video signal is not input. By changing to a different operation from that with projection with the resolution enhancement function, pixel shift does not stop completely, and moves with a special operation that is slower in pixel shift than in normal pixel shift. did. In this way, it is possible to reduce the time during which a projected image with high resolution is displayed unstablely at the time of projection while displaying unnecessary power consumption.
As mentioned above, although the image projection apparatus which concerns on embodiment was demonstrated, this invention is not limited to the said embodiment, A various deformation | transformation and improvement are possible within the scope of the present invention.

Reference Signs List 1 projector 10 system control unit 11 image control unit 111 pixel shift image processing unit 12 movement control unit 30 light source 40 illumination optical system unit 50 image display unit 60 projection optical system unit 511 top plate 512 base plate 515 support column 521 supporting spheres 522 and 526 Support hole 524 Position adjustment screw 531, 532, 533, 534 Magnet 581, 582, 583, 584 Coil 551 DMD
552 movable plate 553 coupling plate 554 heat sink 560 stepped screw 561 spring 571 movable range limiting hole

Unexamined-Japanese-Patent No. 2017-129677

Claims (7)

A fixed unit which is fixedly supported,
A movable unit having an image display element and movable relative to the fixed unit;
A movement control unit that controls movement of the movable unit;
It is an image control unit which raises the number of pixels on a projected image by moving the movable unit by the movement control unit and generating an image on the image display device according to the position of the image display device. The image control unit which changes the operation of the movable unit to a slower operation than that associated with the resolution increase when there is no signal input or when projection is not performed;
An image projector comprising: The image control unit changes the operation of the movable unit to the different operation when the light source is turned off or when the projection is muted as the case where the projection is not performed.
The image projection device according to claim 1, The image control unit changes the operation of the movable unit to linear motion at a lower speed than the projection accompanied with the high resolution when there is no input of a video signal or when projection is not performed.
An image projection apparatus according to claim 1 or 2, characterized in that: The image control unit changes the operation of the movable unit to a circular motion slower than that during the projection accompanied with the high resolution when there is no input of a video signal or when projection is not performed.
An image projection apparatus according to claim 1 or 2, characterized in that: The image control unit changes the operation of the movable unit to an elliptical motion slower than that during the projection accompanied with the high resolution when there is no input of a video signal or when projection is not performed.
An image projection apparatus according to claim 1 or 2, characterized in that: It is performed by an image projection apparatus including a fixed unit supported in a fixed manner, a movable unit having an image display element and movable with respect to the fixed unit, and a movement control unit controlling movement of the movable unit. Image projection method,
The movement control unit
By moving the movable unit and generating an image on the image display element in accordance with the position of the image display element, the number of pixels on the projected image can be enhanced.
If there is no video signal input or no projection is performed, the operation of the movable unit is changed to a slower operation than at the time of the projection accompanied with the resolution enhancement.
An image projection method characterized by On the computer
A process of controlling movement of a movable unit movable with respect to a fixed unit having an image display element and fixedly supported;
A process of moving the movable unit to generate an image on the image display element according to the position of the image display element to thereby increase the resolution of the number of pixels on a projected image;
A process of changing the operation of the movable unit to a slower operation than the projection accompanied with the high resolution when there is no input of a video signal or when projection is not performed;
An image projection program characterized in that it executes.