JP2017032937A - Image projection system, image projection apparatus, and image projection method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To further improve the resolution of a projected image while achieving high resolution by pixel shift.SOLUTION: An image projection system comprises two image projection apparatuses 1 each including: a light source 30 emitting light; an image display unit 50 having a DMD 551 forming an image using the light from the light source 30; an illumination optical system unit 40 guiding the light to the image display unit 50; a projection optical system unit 60 magnifying and projecting the image; and a movable unit control unit 14 reciprocating the DMD 551 in a predetermined direction within a predetermined range, and is configured such that in a state in which a projected image of the first image projection apparatus is superimposed on a projected image of the second image projection apparatus or vice versa, the movable unit control unit 14 of the second image projection apparatus reciprocates the DMD 551 in the predetermined direction within the predetermined range after moving the DMD 551 to a position corresponding to an arbitrary position within the predetermined range within which the movable unit control unit 14 of the first image projection apparatus reciprocates the DMD 551.SELECTED DRAWING: Figure 5

Description

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

  Based on image data transmitted from an information processing device such as a personal computer, a video playback device such as a DVD player, an imaging device such as a digital camera, an optical modulation element (modulation element, image) 2. Description of the Related Art An image projection apparatus (projector) that generates an image by a display element) and projects the generated image onto a projection surface such as a screen through an optical system including a plurality of lenses is known.

  Image projectors are widely used for presentations, conferences, lectures, educational sites, signage, etc. for large numbers of people, as well as improved resolution and low brightness due to higher resolution of LCD panels and higher lamp efficiency. Pricing is progressing.

  In addition, DLP (Digital Light Processing) type image projection apparatuses using DMD (Digital Micro-mirror Device) are widely used, and these image projection apparatuses are widely used not only in offices and schools but also at home. ing. In addition, development of a short focus type image projection apparatus in which a projection distance to a projection surface such as a screen is shortened is also active.

  In such an image projection apparatus, when the resolution of a projected image is increased, it is conceivable to increase the pixel density of the optical modulation element, but the manufacturing cost of the optical modulation element increases.

  On the other hand, in Patent Document 1, an intermediate image is created by shifting pixels by moving an optical element, and an image with a resolution higher than the number of pixels is displayed without increasing the number of pixels of the optical modulation element. A display device is disclosed.

  However, the conventional pixel shifting method has only achieved a resolution that is twice as high as the maximum. For this reason, in order to further increase the resolution, it is necessary to increase the number of pixels of the optical modulation element, leading to an increase in cost.

  Therefore, an object of the present invention is to provide an image projection system capable of further increasing the resolution of a projected image without increasing the number of pixels of an optical modulation element in increasing the resolution by shifting pixels.

  In order to achieve this object, an image projection system according to the present invention includes a light source that emits light, an image display unit that includes a modulation element that forms an image using light from the light source, and light from the light source. An illumination optical unit that leads to the image display unit, a projection optical unit that magnifies and projects an image formed by the image display unit, and a modulation element movable control unit that reciprocates the modulation element in a predetermined range in a predetermined direction. The modulation element movable control unit of the second image projection apparatus in a state where the two image projection apparatuses are provided and the projection image of the first image projection apparatus and the projection image of the second image projection apparatus are superimposed Moves the modulation element to a position corresponding to an arbitrary position within the predetermined range in which the modulation element movement control unit of the first image projection apparatus reciprocates the modulation element, and then the modulation element. The above The constant direction in which reciprocates in a predetermined range.

  According to the present invention, it is possible to further increase the resolution of a projected image in increasing the resolution by shifting pixels.

It is an external appearance perspective view which shows one Embodiment of an image projector. It is a side view of an image projection device, and is a diagram showing a projection state on a projection surface. 2A is a perspective view showing a state in which an exterior cover of the image projection apparatus is removed, and FIG. 3B is an enlarged configuration diagram of a circled portion of FIG. It is sectional drawing of an illumination optical system unit, a projection optical system unit, an image display unit, and a light source unit. It is a block diagram which illustrates the functional composition of an image projection device. It is a perspective view which illustrates an image display unit. It is a side view which illustrates an image display unit. It is a perspective view which illustrates a fixed unit. It is a disassembled perspective view which illustrates a fixed unit. It is a figure explaining the support structure of the movable plate by a fixed unit. It is the elements on larger scale explaining the support structure of the movable plate by a fixed unit. It is a bottom view which illustrates a top cover. It is a perspective view which illustrates a movable unit. It is a disassembled perspective view which illustrates a movable unit. It is a perspective view which illustrates a movable plate. It is a perspective view which illustrates the movable unit from which the movable plate was removed. It is a figure explaining the DMD holding structure of a movable unit. It is a figure explaining high resolution by pixel shifting. It is a schematic block diagram which shows an example of an image projection system. It is a functional block diagram of a video supply device. It is a sequence diagram of high resolution processing. It is a figure explaining high resolution by an image projection system. It is a simple schematic diagram of the state by which the mirror of DMD is arrange | positioned. It is a simple schematic diagram of a state where the DMD is shifted by half a pixel. It is a simple schematic diagram of the state where OSD character data is displayed on the DMD. It is a simple schematic diagram of a state in which OSD character data is displayed and DMD is periodically shifted. It is a simple schematic diagram in the case of being composed of a certain number of dot groups for character expression. FIG. 26 is a schematic diagram illustrating an example in which the characters expressed in FIG. 25 are expressed using dots that are approximately double in length and width. It is a schematic diagram at the time of shifting the character expressed in FIG. 28 periodically. It is a block diagram of a system control part. FIG. 24 is a simplified schematic diagram showing a state in which the DMD shown in FIG. 23 is periodically shifted by half a pixel. It is a schematic diagram which shows the example which superimposed OSD data with respect to the odd-numbered frame, and displayed OSD character data on DMD. It is a schematic diagram expressing the appearance when displaying the display start position of the odd frame without considering the shift of the display start coordinate position of the OSD data in the even frame. It is the schematic diagram (1) expressing the appearance at the time of superimposing OSD data on a video signal in consideration of the display start position coordinate of OSD data of an even-numbered frame. It is a schematic diagram (2) expressing the appearance when the OSD data is superimposed on the video signal in consideration of the display start position coordinates of the OSD data of the even frame.

  Hereinafter, the configuration according to the present invention will be described in detail based on the embodiment shown in FIGS.

  An image projection system (image projection system 100) according to the present embodiment includes a light source (light source 30) that emits light and an image display unit (DMD551) that forms an image using light from the light source (DMD551). An image display unit 50), an illumination optical unit (illumination optical system unit 40) that guides light from the light source to the image display unit, and a projection optical unit (projection optical system unit 60) that magnifies and projects an image formed by the image display unit. ) And a modulation element movable control unit (movable unit control unit 14) that reciprocates the modulation element in a predetermined direction within a predetermined range, and includes two image projection apparatuses (image projection apparatus 1), and the first image In a state where the projection image of the projection apparatus (image projection apparatus 1A) and the projection image of the second image projection apparatus (image projection apparatus 1B) are superimposed, the modulation element movable control unit of the second image projection apparatus is After the modulation element is moved to a position corresponding to an arbitrary position within a predetermined range in which the modulation element movement control unit of the image projection apparatus of 1 is reciprocated, the modulation element is reciprocated within a predetermined range in a predetermined direction. It is something to be made. In addition, the code | symbol in embodiment and the example of application are shown in a parenthesis.

(Image projection device)
FIG. 1 is an external perspective view showing an embodiment of an image projector 1. FIG. 2 is a side view of the image projecting apparatus 1 and shows a state of projection onto the screen S that is the projection surface.

  FIG. 3A is a perspective view showing a state in which the exterior cover 2 of the image projector 1 is removed. FIG. 3B is an enlarged configuration diagram of the optical engine 3 and the light source unit 4 indicated by a circled portion in FIG.

  The image projection apparatus 1 is required to be able to make the projection space required outside the image projection apparatus as small as possible along with the enlargement of the projection screen. In recent years, the performance of the optical engine 3 has improved, and the image projector 1 that can achieve a projection image size of 60 inches to 80 inches with a projection distance of 1 to 2 m has become mainstream.

  In the case of the conventional image projection apparatus 1 with a long projection distance, there is a conference desk or the like between the image projection apparatus 1 and the screen S, and the image projection apparatus 1 is arranged behind the conference desk. In recent years, as the projection distance has been shortened, it can be arranged on the front side of the conference desk, and the space behind the image projection apparatus 1 can be freely utilized.

  The image projection apparatus 1 includes a lamp as a light source and a large number of electronic boards inside the apparatus, and the internal temperature of the apparatus rises as time passes after startup. This is remarkable in recent years when the housing size of the image projecting apparatus 1 has been reduced, and therefore, the image projecting apparatus 1 includes an intake port 16 and an exhaust port so that the internal components do not exceed the heat-resistant temperature. 17 is provided.

  As shown in FIG. 3, the image projection apparatus 1 includes an optical engine 3 and a light source unit 4. 4 is a cross-sectional view of the illumination optical system unit 40, the projection optical system unit 60, the image display unit 50, and the light source unit 4, which are illumination devices, as viewed from above. The optical engine 3 includes an illumination optical system unit 40 and a projection optical system unit 60.

  As shown in FIG. 3, an intake fan 18 and an exhaust fan 19 are provided inside the intake port 16 and the exhaust port 17, respectively. By discharging the outside air drawn from the intake fan 18 from the exhaust fan 19, Air cooling by forced air flow in the apparatus is performed.

  In the image projection apparatus 1, light (white light) from the light source of the light source unit 4 is applied to the illumination optical system unit 40 of the optical engine 3. In the illumination optical system unit 40, the emitted white light is separated into RGB, and then guided to the image display unit 50 by a lens, a mirror, and the like, and the image display unit 50 that forms an image according to the modulation signal and the image are projected optically. The system unit 60 enlarges and projects the image onto the screen S.

  Various lamps can be used as the lamp of the light source unit 4 (light source 30). For example, an arc lamp such as a high-pressure mercury lamp or a xenon lamp can be used. For example, it is preferable to use a high-pressure mercury lamp.

  A fan 20 for cooling the light source is provided on one side of the side surface of the light source unit 4. The rotation speed of the fan 20 is controlled so that each part of the light source unit 4 has a temperature within a set rated temperature range. Further, the emission direction of light from the light source unit 4 and the emission direction of image light from the projection optical system unit 60 are approximately 90 ° as shown in FIG.

  The illumination optical system unit 40 of the optical engine 3 includes a color wheel 5 (rotating color filter) that separates light emitted from the light source, a light tunnel 6 that guides light emitted from the color wheel 5, a relay lens 7, A plane mirror 8 and a concave mirror 9 are provided. An image display unit 50 is provided in the illumination optical system unit 40.

  In the illumination optical system unit 40, first, white light, which is emitted light from the light source, is converted into light that repeats each color of RGB every unit time by the disk-shaped color wheel 5 and emitted. The color-separated light emitted from the color wheel 5 is guided to the light tunnel 6. The light tunnel 6 is an illumination uniform conversion optical member that makes incident light uniform by being reflected and combined multiple times inside (inner wall).

  Next, the light emitted from the light tunnel 6 is condensed by correcting a longitudinal chromatic aberration of the light by a relay lens 7 formed by combining two lenses. Further, the light emitted from the relay lens 7 is reflected by the plane mirror 8 and the concave mirror 9 and is condensed on the image display unit 50. The image display unit 50 has a substantially rectangular mirror surface made up of a plurality of micromirrors, and each micromirror is driven in a time-sharing manner based on image data, thereby processing the projection light so as to form a predetermined image. Thus, a DMD 551 is provided as an image display element to be reflected.

  The image display unit 50 selects the light that is output to the projection unit by switching the micromirror on and off according to the input signal, and expresses the gradation. That is, the DMD 551 reflects the light used by the plurality of micromirrors to the projection lens and reflects the discarded light to the OFF light plate based on the image data in a time division manner. The light used in the image display unit 50 is reflected to the projection optical system unit 60, and the image light magnified through the plurality of projection lenses in the projection optical system unit 60 is magnified and projected onto the screen S.

  The incident side of the relay lens 7, the plane mirror 8, the concave mirror 9, the image display unit 50, and the projection optical system unit 60 inside the illumination optical system unit 40 is held by a housing (not shown) so as to cover each component. In addition, the mating surface of the housing has a dustproof structure sealed with a sealing material.

  FIG. 5 is a functional block diagram illustrating an example of the image projection apparatus 1 according to the present embodiment.

  The image projection apparatus 1 includes a system control unit 10, a lamp control unit 11, a color wheel control unit 12, a DMD control unit 13, a movable unit control unit 14, a fan control unit 15, a fan 20, a remote control receiving unit 22, and a main body operation unit 23. , Input terminal 24, video signal control unit 25, nonvolatile memory 26, power supply unit 27, light source 30, illumination optical system unit 40, image display unit 50, projection optical system unit 60, etc. It is an image projection device. Moreover, the remote control 21 as a remote control means is provided.

  The system control unit 10 performs overall control of the image projection apparatus 1. In addition, image processing such as contrast adjustment, brightness adjustment, sharpness adjustment, scaling processing, display control of superimposed screens (OSD: On Screen Display) such as menu information, and other various controls are performed on the input video signal. Do it.

  In addition, the lamp control unit 11, the color wheel control unit 12, the DMD control unit 13, the movable unit control unit 14, the fan control unit 15, the remote control reception unit 22, the main body operation unit 23, the video signal control unit 25, the nonvolatile memory 26, And control each of these functional units.

  Each control unit such as the system control unit 10 is configured by a microcontroller (microcomputer), and has a calculation unit and a storage unit such as a CPU (Central Processing Unit), ROM (Read Only Memory), and RAM (Random Access Memory). Then, the function of each unit is realized by the CPU executing a program stored in the ROM in cooperation with the RAM.

  The input terminal 24 is an interface for inputting a video signal, and is a VGA (Video Graphics Array) input terminal such as a D-Sub connector, an HDMI (High-Definition Multimedia Interface) (registered trademark) terminal, an S-VIDEO terminal, an RCA. Video input terminals such as terminals. A video signal is received from a video supply device such as a computer or AV device via a cable connected to the input terminal 24. Further, a plurality of input terminals 24 may be provided.

  The video signal control unit 25 processes the video signal input to the input terminal 24. For example, the video signal control unit 25 performs various processes such as serial-parallel conversion and voltage level conversion on the video signal. It also has a signal determination function that analyzes the resolution and frequency of the video signal.

  The nonvolatile memory 26 stores data in image processing and other various processing on the video signal. As the non-volatile memory 26, for example, a non-volatile semiconductor memory such as an EPROM, an EEPROM, or a flash memory can be employed. The image projecting apparatus 1 can store the previous setting contents (such as language settings) even after the power is turned off.

  The main body operation unit 23 is an interface for operating the image projection apparatus 1 and accepts various operation requests from the user. When accepting an operation request, the main body operation unit 23 notifies the system control unit 10 of the operation request. The main body operation unit 23 includes operation keys (operation buttons) provided on the outer surface of the image projection apparatus 1.

  The remote control receiving unit 22 receives an operation signal from the remote control 21. When receiving the operation signal, the remote control receiving unit 22 notifies the system control unit 10 of the operation signal.

  The user can perform various settings by operating the main body operation unit 23 or the remote controller 21. For example, a display instruction for a menu screen, selection of the installation state of the image projection apparatus 1, a request to change the aspect ratio of the projection image, a request to turn off the image projection apparatus 1, a lamp power change request to change the light amount of the light source 30, A video mode change request for changing the image quality (high brightness, standard, natural, etc.), a freeze request for stopping the projected image, and the like can be executed.

  The fan control unit 15 controls the fan 20 so that the temperature in the image projection apparatus 1 and the temperature of the light source 30 become predetermined temperatures.

  The power supply unit 27 is connected to each device in the image projection apparatus 1, converts AC (alternating current) power input from an outlet or the like into DC (direct current), and supplies power to each device in the image projection apparatus 1. Supply.

  The fan 20 includes an intake fan, an exhaust fan, a cooling fan, and the like. By discharging the outside air sucked from the intake fan from the exhaust fan, an air flow is generated in the image projection apparatus 1 and air cooling is performed. A cooling fan as a light source cooling unit is provided in the vicinity of the light source 30, and the amount of rotation of the cooling fan is controlled based on the temperature of the light source 30.

  The light source 30 is, for example, a high-pressure mercury lamp in which a luminescent material emits light by a discharge between a pair of electrodes, and irradiates the illumination optical system unit 40 with light. In addition, a xenon lamp, an LED, or the like can be used as the light source 30. The lamp control unit 11 controls on / off of the light source 30 and lighting power.

  The light emitted from the light source 30 is split into light that repeats each color per unit time by the disk-shaped color wheel 5 in the illumination optical system unit 40.

  The color wheel control unit 12 controls the rotational drive of the color wheel 5.

  The light emitted from the color wheel 5 is condensed on the DMD 551 as an image display element in the image display unit 50 through the light tunnel 6, the relay lens 7, the plane mirror 8 and the concave mirror 9.

  The image display unit 50 includes a fixed unit 51 (FIG. 6) that is fixedly supported and a movable unit 55 that is provided so as to be movable with respect to the fixed unit 51. The movable unit 55 has a DMD 551, and the position of the movable unit 55 relative to the fixed unit 51 is controlled by the movable unit control unit 14.

  The movable unit 55 is provided with an electromagnetic actuator (voice coil, magnet) as drive means, and the movable unit control unit 14 controls the amount of current to flow to the drive means of the movable unit 55 to shift the DMD 551. Control the amount. The shift control of the DMD 551 by the movable unit control unit 14 can be turned on / off by operating the main body operation unit 23 or the remote controller 21. When the shift control of the DMD 551 is set to OFF, a normal projection screen display in which the DMD 551 is not shifted is displayed.

  The DMD 551 has a substantially rectangular mirror surface composed of a plurality of micromirrors, and each micromirror is driven in a time-sharing manner based on video data, thereby processing and reflecting the projection light so as to form a predetermined video. This is an image display element. Further, the DMD control unit 13 controls on / off of the micromirror of the DMD 551.

  The DMD 551 reflects the light used by the plurality of micromirrors to the projection optical system unit 60 based on the video data in a time division manner, and reflects the discarded light to the OFF light plate. The light to be used is reflected to the projection optical system unit 60, and the image light enlarged through the projection optical system unit 60 is enlarged and projected onto the screen S.

  The projection optical system unit 60 includes, for example, a plurality of projection lenses, mirrors, etc., and enlarges and projects an image generated by the DMD 551 of the image display unit 50 onto the screen S.

(Image display unit)
FIG. 6 is a perspective view illustrating the image display unit 50. FIG. 7 is a side view illustrating the image display unit 50.

  As shown in FIGS. 6 and 7, the image display unit 50 includes a fixed unit 51 that is fixedly supported and a movable unit 55 that is provided so as to be movable with respect to the fixed unit 51.

  The fixed unit 51 includes a top plate 511 as a first fixed plate and a base plate 512 as a second fixed plate. In the fixing unit 51, a top plate 511 and a base plate 512 are provided in parallel via a predetermined gap.

  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 and the base plate 512 of the fixed unit 51, and is supported by the fixed unit 51 so as to be movable 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. The coupling plate 553 is provided with the DMD 551 fixed on the upper surface side and the heat sink 554 fixed on the lower surface side. The coupling plate 553 is fixed to the movable plate 552 so that it can be moved to 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 on which a plurality of movable micromirrors are arranged in a grid pattern. Each micromirror of the DMD 551 is provided so that the mirror surface can tilt around the torsion axis, and is driven ON / OFF based on an image signal transmitted from the DMD control unit 13.

  For example, when the micromirror is “ON”, the tilt angle is controlled so that the light from the light source 30 is reflected to the projection optical system unit 60. When the micromirror is “OFF”, for example, the tilt angle is controlled in a direction in which the light from the light source 30 is reflected toward the OFF light plate.

  As described above, the DMD 551 controls the tilt angle of each micromirror by the image signal transmitted from the DMD control unit 13, modulates the light emitted from the light source 30 and passes through the illumination optical system unit 40, and generates a projection image. Generate.

  The heat sink 554 is an example of an enlarged heat radiating portion, and is provided so that at least a part thereof is in contact with the DMD 551. The heat sink 554 is provided together with the DMD 551 on the coupling plate 553 that is movably supported, so that the heat sink 554 can be efficiently abutted against the DMD 551 and cooled. With such a configuration, in the image projection apparatus 1 according to the present embodiment, the heat sink 554 suppresses the temperature rise of the DMD 551, and the occurrence of malfunctions such as malfunction and failure due to the temperature rise of the DMD 551 is reduced.

[Fixed unit]
FIG. 8 is a perspective view illustrating the fixed unit 51. FIG. 9 is an exploded perspective view illustrating the fixed unit 51.

  As shown in FIGS. 8 and 9, the fixing unit 51 includes a top plate 511 and a base plate 512.

  The top plate 511 and the base plate 512 are formed of flat plate-like members, and central holes 513 and 514 are provided at positions corresponding to the DMD 551 of the movable unit 55, respectively. The top plate 511 and the base plate 512 are provided in parallel by a plurality of support columns 515 with a predetermined gap therebetween.

  As shown in FIG. 9, the support column 515 is press-fitted into a support column hole 516 formed in the top plate 511 at the upper end, and a support column hole 517 formed in the base plate 512 at the lower end portion where the male screw groove is formed. Inserted into. The support columns 515 form a fixed interval between the top plate 511 and the base plate 512, and support the top plate 511 and the base plate 512 in parallel.

  The top plate 511 and the base plate 512 are formed with a plurality of support holes 522 and 526 for holding the support sphere 521 rotatably.

  A cylindrical holding member 523 having an internal thread groove on the inner peripheral 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 adjusting 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 are in contact with the movable plate 552 provided between the top plate 511 and the base plate 512, respectively, so that the movable plate 552 can move. To support.

  FIG. 10 is a view for explaining a support structure of the movable plate 552 by the fixed unit 51. FIG. 11 is a partial enlarged view illustrating a schematic configuration of a 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 the 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 part thereof protrudes from the support holes 522 and 526, and supports and supports a movable plate 552 provided between the top plate 511 and the base plate 512. The movable plate 552 is supported from both sides by a plurality of support spheres 521 that are rotatably provided so as to be movable in a direction parallel to the top plate 511 and the base plate 512 and parallel to the surface.

  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 varies depending on the position of the position adjusting screw 524 that contacts the opposite side of the movable plate 552. For example, when the position adjusting screw 524 is displaced in the Z1 direction, the protrusion amount of the support sphere 521 is reduced, and the interval between the top plate 511 and the movable plate 552 is reduced. For example, when the position adjusting screw 524 is displaced in the Z2 direction, the protruding amount of the support sphere 521 increases, and the interval between the top plate 511 and the movable plate 552 increases.

  As described above, the distance between the top plate 511 and the movable plate 552 can be appropriately adjusted by changing the protruding amount of the support sphere 521 using the position adjusting screw 524.

  8 and 9, magnets 531, 532, 533, and 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. As shown in FIG. 12, magnets 531, 532, 533, and 534 are provided on the surface of the top plate 511 on the base plate 512 side.

  The magnets 531, 532, 533, and 534 are provided at four locations so as to surround the central hole 513 of the top plate 511. The magnets 531, 532, 533, and 534 are composed of two rectangular parallelepiped magnets that are arranged so that their longitudinal directions are parallel to each other, and each form a magnetic field that reaches the movable plate 552.

  The magnets 531, 532, 533, and 534 constitute 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, 532, 533, and 534, respectively.

  Note that the number, position, and the like of the support columns 515 and the support spheres 521 provided in the fixed unit 51 are not limited to the configuration exemplified in the present embodiment as long as the movable plate 552 can be movably supported.

[Movable unit]
FIG. 13 is a perspective view illustrating the movable unit 55. FIG. 14 is an exploded perspective view illustrating the movable unit 55.

  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, and is movably supported with respect to the fixed unit 51. Has been.

  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 is supported by a plurality of support spheres 521 so as to be movable in a direction parallel to the surface.

  FIG. 15 is a perspective view illustrating the movable plate 552.

  As shown in FIG. 15, the movable plate 552 is formed of a flat plate-like member, has a central hole 570 at a position corresponding to the DMD 551 provided on the DMD substrate 557, and coils 581, 582 around the central hole 570. , 583, 584 are provided.

  Coils 581, 582, 583, 584 are formed by winding an electric wire around an axis parallel to the Z 1 Z 2 direction, and are provided in a recess formed on the surface of the movable plate 552 on the top plate 511 side. Covered with a cover. Coils 581, 582, 583, and 584 constitute moving means for moving the movable plate 552 with the magnets 531, 532, 533, and 534 of the top plate 511, respectively.

  The magnets 531, 532, 533 and 534 of the top plate 511 and the coils 581, 582, 583 and 584 of the movable plate 552 are provided at positions facing each other in a state where the movable unit 55 is supported by the fixed unit 51. ing. When a current is passed through the coils 581, 582, 583, 584, a Lorentz force that is a driving force for moving the movable plate 552 is generated by a magnetic field formed by the magnets 531, 532, 533, and 534.

  The movable plate 552 receives a Lorentz force as a driving force generated between the magnets 531, 532, 533 and 534 and the coils 581, 582, 583 and 584, and is linear with respect to the fixed unit 51 in the XY plane. Or it is displaced to rotate.

  The magnitude | size and direction of the electric current sent through each coil 581,582,583,584 are controlled by the movable unit control part 14. FIG. The movable unit control unit 14 controls the movement (rotation) direction, the movement amount, the rotation angle, and the like of the movable plate 552 according to the magnitude and direction of the current flowing through the coils 581, 582, 583, 584.

  In the present embodiment, as the first driving means, a coil 581 and a magnet 531, and a coil 584 and a magnet 534 are provided facing each other in the X1X2 direction. When a current is passed through the coil 581 and the coil 584, a 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.

  In the present embodiment, as the second driving means, a coil 582 and a magnet 532, and a coil 583 and a magnet 533 are provided side by side in the X1X2 direction, and the magnet 532 and the magnet 533 are the same as the magnet 531 and the magnet 534. It arrange | positions so that a longitudinal direction may orthogonally cross. In such a configuration, when a current is passed through the coil 582 and the coil 583, a Lorentz force in the Y1 direction or the 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 and the magnet 532, and the coil 583 and the magnet 533. Further, the movable plate 552 is displaced so as to rotate in the XY plane by the 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 Lorentz force in the Y1 direction is generated in the coil 582 and the magnet 532 and a current is applied so that a Lorentz force in the Y2 direction is generated in the coil 583 and the magnet 533, the movable plate 552 is rotated in the clockwise direction when viewed from above. Displace to rotate. Further, when a Lorentz force in the Y2 direction is generated in the coil 582 and the magnet 532 and a current is applied so that a Lorentz force in the Y1 direction is generated in the coil 583 and the magnet 533, the movable plate 552 rotates counterclockwise in a top view. Displace to rotate in the direction.

  The movable plate 552 is provided with a movable range limiting hole 571 at a position corresponding to the column 515 of the fixed unit 51. The movable range limiting hole 571 limits the movable range of the movable plate 552 by contacting the column 515 when the column 515 of the fixed unit 51 is inserted and the movable plate 552 moves greatly due to vibration or some abnormality, for example.

  As described above, in the present embodiment, the movable unit control unit 14 controls the magnitude and direction of the current flowing through the coils 581, 582, 583, 584, so that the movable plate 552 can be arbitrarily moved within the movable range. Can be moved to a position.

  It should be noted that the number, position, etc. of the magnets 531, 532, 533, 534 as the moving means and the coils 581, 582, 583, 584 can be adjusted as long as the movable plate 552 can be moved to an arbitrary position. Different configurations may be used. For example, the magnet as the moving unit may be provided on the upper surface of the top plate 511 or may be provided on any surface of the base plate 512. Further, 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, position, shape, and the like of the movable range restriction hole 571 are not limited to the configuration exemplified in this embodiment. For example, the movable range restriction hole 571 may be one or plural. Further, the shape of the movable range limiting hole 571 may be 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 (base plate 512 side) of the movable plate 552 that is movably supported by the fixed unit 51. The coupling plate 553 is formed of a flat plate member, has a central hole at a position corresponding to the DMD 551, and a bent portion provided around is fixed to the lower surface of the movable plate 552 with three screws 591.

  FIG. 16 is a perspective view illustrating the movable unit 55 with the movable plate 552 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 that it can move 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 means.

  FIG. 17 is a diagram for explaining the DMD holding structure of the movable unit 55. FIG. 17 is a side view of the movable unit 55, and the movable plate 552 and the coupling plate 553 are not shown.

  As shown in FIG. 17, the heat sink 554 has a protruding portion 554 a that contacts the lower surface of the DMD 551 through a through hole provided in the DMD substrate 557 while being fixed to the coupling plate 553. Note that the protrusion 554 a of the heat sink 554 may be provided on the lower surface of the DMD substrate 557 and in contact with a position corresponding to the DMD 551.

  In order to enhance the cooling effect of the DMD 551, a heat transfer sheet that can be elastically deformed may be provided between the protrusion 554a of the heat sink 554 and the DMD 551. The heat transfer sheet improves the thermal conductivity between the protrusion 554a of the heat sink 554 and the DMD 551, and the cooling effect of the DMD 551 by the heat sink 554 is improved.

  As described above, the holding member 555, the DMD substrate 557, and the heat sink 554 are overlapped and fixed by the stepped screw 560 and the spring 561. When the stepped screw 560 is tightened, the spring 561 is compressed in the Z1Z2 direction, and a force F1 in the Z1 direction shown in FIG. Due to the force F1 generated from the spring 561, the heat sink 554 is pressed against the DMD 551 by the force F2 in the Z1 direction.

  In the present embodiment, the stepped screw 560 and the spring 561 are provided at four locations, and the force F2 applied to the heat sink 554 is equal to the combined force F1 generated on the four springs 561. The force F2 from the heat sink 554 acts on the holding member 555 that holds the DMD substrate 557 on which the DMD 551 is provided. As a result, a reaction force F3 in the Z2 direction corresponding to the force F2 from the heat sink 554 is generated in the holding member 555, and the DMD substrate 557 can be held between the holding member 555 and the coupling plate 553.

  A force F4 in the Z2 direction acts on the stepped screw 560 and the spring 561 from a force F3 generated on the holding member 555. Since the springs 561 are provided at four locations, the force F4 acting on each of them corresponds to a quarter of the force F3 generated on the holding member 555, and balances with the force F1.

  The holding member 555 is a member that can be bent as shown by an arrow B in FIG. The holding member 555 is pressed and bent by the protruding portion 554a of the heat sink 554, and a force that pushes back the heat sink 554 in the Z2 direction is generated, so that the contact between the DMD 551 and the heat sink 554 can be kept stronger.

  As described above, the movable unit 55 is supported by the fixed unit 51 so that the movable plate 552 and the coupling plate 553 having the DMD 551 and the heat sink 554 are movable. The position of the movable unit 55 is controlled by the movable unit controller 14. Further, the movable unit 55 is provided with a heat sink 554 that abuts on the DMD 551, thereby preventing malfunctions such as malfunction and failure due to the temperature rise of the DMD 551.

(Pixel shift (DMD shift))
As described above, the DMD 551 that generates a projection image in the image projector 1 is provided in the movable unit 55, and the position of the DMD 551 is controlled together with the movable unit 55 by the movable unit controller 14.

  For example, the movable unit controller 14 moves the movable unit at a high speed between a plurality of positions separated by a distance less than the arrangement interval of the plurality of micromirrors of the DMD 551 at a predetermined period corresponding to the frame rate at the time of image projection. The position of 55 is controlled. 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 movable unit controller 14 reciprocates the DMD 551 in a predetermined cycle between a position A and a position B separated by a distance less than the arrangement interval of the micromirrors of the DMD 551 in the X1X2 direction and the Y1Y2 direction. At this time, the DMD control unit 13 controls the DMD 551 so as to generate a projection image shifted according to each position, so that the resolution of the projection image can be approximately double the resolution of the DMD 551. Become.

  As described above, the movable unit control unit 14 moves the DMD 551 together with the movable unit 55 in a predetermined cycle, and the DMD control unit 13 causes the DMD 551 to generate a projection image corresponding to the position, thereby projecting an image having a resolution higher than that of the DMD 551. It becomes possible to do.

  FIG. 18 is an explanatory diagram showing an image of a display state of pixels shifted by half a pixel by pixel shifting (hereinafter also referred to as DMD shift).

  FIG. 18A shows each pixel S1 in a state where the display position is not shifted (the state before the shift, the first state), and the size of each pixel is XL × YL. FIG. 18B shows each pixel S2 in a state (second state) shifted by half a pixel (XL / 2, YL / 2). Then, by synthesizing the two images, that is, by alternately projecting the image at each pixel, it is possible to increase the resolution in a pseudo manner as shown in FIG.

(Image projection system)
According to the image projection apparatus 1 described above, it is possible to realize a resolution increase of up to about twice. The image projection system according to the present embodiment uses a plurality of the image projection apparatuses 1 described so far to perform stack projection, thereby further increasing the resolution.

  FIG. 19 is a schematic configuration diagram illustrating an example of the image projection system 100. The image projection system 100 includes two image projection apparatuses 1A and 1B and a video supply apparatus 110 that supplies video signals (also referred to as projection information) to the image projection apparatuses 1A and 1B. Projection apparatuses 1A and 1B and video supply apparatus 110 are connected by cables 120A and 120B. The video signal includes an image signal for displaying a still image.

  The image projection apparatuses 1A and 1B are projectors that generate an image based on the image signal provided by the image supply device 110 and project the image on the screen S.

  The image projection apparatuses 1A and 1B have an HDMI (High-Definition Multimedia Interface) (registered trademark) terminal, a DisplayPort terminal, a Thunderbolt terminal, a VGA (Video Graphics Array) input terminal, as an interface (input terminal 24) for inputting a video signal. Image input terminals such as an S-VIDEO terminal and an RCA terminal are provided. Moreover, it is preferable that the image projection apparatuses 1A and 1B include a plurality of image input terminals. A video signal is received from the video supply device 110 via the cables 120A and 120B connected to the image input terminal. The cables 120A and 120B are cables compliant with the communication interface, and are, for example, HDMI cables.

  In addition, the image projection apparatuses 1A and 1B may receive a video signal from the video supply apparatus 110 by wireless communication complying with a wireless communication protocol such as Bluetooth (registered trademark) or WiFi (registered trademark).

  The video supply device 110 is a device that provides an image to be projected by the image projection devices 1A and 1B. The video supply device 110 includes an interface that outputs a video signal, and an image projection device that transmits a video signal forming a display image of the video supply device 110 at a predetermined transfer rate (for example, 30 fps (frame per second) to 60 fps). 1, 1B.

  Similarly, the video supply device 110 includes image output terminals such as an HDMI terminal, a DisplayPort terminal, a Thunderbolt terminal, a VGA input terminal, an S-VIDEO terminal, and an RCA terminal as interfaces for outputting video signals. The image can be transmitted to the image projection apparatuses 1A and 1B via the connected cables 120A and 120B. In addition, the video supply device 110 may transmit a video signal to the image projection devices 1A and 1B by wireless communication.

  Note that the projection information that is the basis of the projection image 130 projected by the image projection apparatus 1 is not limited to that provided from the video supply apparatus 110, and may be information stored in the storage unit of the image projection apparatus 1. Alternatively, it may be stored in an auxiliary storage device such as a USB memory that can be externally connected to the image projection device 1. In this case, the image projection system 100 is configured by the image projection apparatus 1A and the image projection apparatus 1B, and may have common projection information.

  As the video supply device 110, for example, an information processing device capable of supplying video signals such as a notebook PC, a desktop PC, a tablet PC, a smartphone, a video playback device such as a DVD player, an imaging device such as a digital camera, etc. Can be used.

  FIG. 20 shows a functional block diagram of the video supply device 110. The video supply device 110 includes an input unit 111 for inputting data, a display unit 112 such as a display, a communication unit 113 for performing data communication, a CPU 114 as a control unit that controls the entire device, and a CPU 114. The RAM 115 is used as a work area, and the storage unit 116 stores various programs for operating the CPU 114.

  In FIG. 19, a projection image 130 that is stacked and projected by the image projection apparatuses 1 </ b> A and 1 </ b> B is projected on the screen S. At this time, the two image projection apparatuses 1A and 1B are in a state in which the resolution is increased by shifting the pixels, respectively, and as described below, one image projection apparatus is set to 1/4 pixel. The projection images 130 are superimposed and projected in a stack with a shift of minutes (XL / 4, YL / 4).

(High brightness processing)
FIG. 21 is a sequence diagram of the resolution enhancement process executed by the image projection system 100. FIG. 22 is an explanatory diagram of a resolution enhancement process performed by the image projection system 100. FIG. 22A is a display state of pixels shifted by half a pixel in the DMD shift process in the master image projection apparatus 1A. (B) is an image of a pixel display state shifted by half a pixel by DMD shift processing in the image projection apparatus 1B as a slave, and (C) is an image projection apparatus 1A, 1B on which stack projection is performed. It is explanatory drawing which showed the image of the display state of the pixel shifted by the half pixel by DMD shift process.

  In the high luminance process, first, the operator 140 instructs invalidation of the high resolution process in the image projection apparatuses 1A and 1B (S101-1 and S101-2). The high resolution processing invalidation instruction may be instructed from the menu screen, or is provided by providing a dedicated button on the main body operation unit 23 or the remote control 21 and pressing the corresponding button. Also good.

  The image projection apparatuses 1A and 1B that have received the invalidation instruction for the high resolution processing stop the half-pixel shift processing (DMD shift processing) at a constant cycle for high resolution (S102-1 and S102-2). . By stopping the DMD shift, the end portion (frame) of the projection image 130 is completely stopped, so that alignment can be easily performed. The operator 140 aligns the projection images 130 of the image projection apparatuses 1A and 1B with the DMD shift of the image projection apparatuses 1A and 1B stopped (S103-1, S103-2).

  The alignment method at this time may be, for example, that the operator 140 aligns the position of the end portion while viewing the projection image 130. At this time, it is preferable to project a test pattern for alignment as the projected image 130. Further, the image projection apparatuses 1A and 1B may include an imaging unit that captures the projection image 130, and may perform alignment by position control of the DMD 551 based on imaging data obtained by capturing the projection image 130.

  After stopping the DMD shift process, the operator 140 sets one of the image projection apparatuses 1A and 1B as a master and the other as a slave (S104, S106). Here, a case where the image projection apparatus 1A is a master and the image projection apparatus 1B is a slave is taken as an example, but either may be used as a master. This setting may be performed as long as operation from the main body operation unit 23 or the remote controller 21 is possible. The image projection apparatuses 1A and 1B store information on whether they are set masters or slaves in the nonvolatile memory 26 or the like (S105, S107).

  Next, the operator 140 instructs activation of the high resolution processing in the image projection apparatuses 1A and 1B (S108-1 and S108-2). It should be noted that the high resolution processing validation instruction may be the same method as the invalidation instruction.

  The master image projection apparatus 1A that has received the activation instruction starts the half-pixel shift process (DMD shift process) at a constant cycle as it is (S110-1, FIG. 22A).

  On the other hand, the movable unit control unit 14 of the slave image projection apparatus 1B that has received the activation instruction moves the DMD 551 in the ¼ diagonal direction (S109, FIG. 22B). Then, from that position, a half-pixel shift process (DMD shift process) at a constant cycle is started in the same direction as the shift direction of the master image projection apparatus 1A (S110-2). As a result, as shown in FIG. 22C, it is possible to project a projection image with higher resolution up to about 4 times.

In the present embodiment, the shift amount (for half pixel) in the DMD shift processing of the image projection apparatuses 1A and 1B and the movement amount (for 1/4 pixel) that the image projection apparatus 1B moves in S109 are as follows:
It is the most ideal value and may be a value before or after this value. Further, the amount of movement that the image projection apparatus 1B moves in S109 may be at least one that starts from a position corresponding to an arbitrary position within the range to which the DMD 551 shifts in the DMD shift processing of the image projection apparatus 1A. .

  In the DMD shift process of the image projection apparatus 1A and the DMD shift process of the image projection apparatus 1B, the movement amount (movement range) of the reciprocating operation of the DMD 551 may be different, but the movement amount is the same. Preferably there is.

  Further, it is preferable that the DMD shift process of the image projection apparatus 1A and the DMD shift process of the image projection apparatus 1B are synchronized. The synchronization here refers to the display timing of the first state (FIG. 18) in the DMD shift processing of the image projection device 1A and the image projection device 1B, and the first in the DMD shift processing of the image projection device 1A and the image projection device 1B. This means that the display timings of the two states (FIG. 18) are synchronized.

  According to the image projecting apparatus and the image projecting system according to the present embodiment described above, a projection image with higher resolution can be obtained by performing stack projection using a plurality of image projecting apparatuses whose brightness is increased by pixel shifting. Can be projected.

  The image projection apparatus 1A and the image projection apparatus 1B preferably use apparatuses of the same performance, but at least the resolution of the projection image 130 and the mirror size of the DMD 551 are the same, and two units having a mechanism for shifting the DMD 551 are provided. The image projection apparatus 1 can be applied.

  In the above-described embodiment, the resolution enhancement process using the two image projection apparatuses 1A and 1B has been described. However, in the resolution enhancement process using three or more image projection apparatuses, each shift range is set to one. The present invention can be applied by shifting the portions in an overlapping manner.

  In the above-described embodiment, the image projection apparatus is described by taking a DLP (Digital Light Processing) type projector as an example. However, the present invention is not limited to this, and the image display element is shifted even in other types. The present invention can be applied to any configuration.

  In the above-described embodiment, the horizontal projector has been described as an example. However, the present invention can also be applied to a vertical ultrashort focus type projector using optical reflection.

  In the above embodiment, an example in which an electromagnetic actuator (electromagnetic driving means) is used as the driving means for the image display element is described. However, the driving means for the image display element is not limited to this.

  Hereinafter, another embodiment (1) of the image projection apparatus will be described.

  By the way, when the resolution is increased by DMD shift, all of the projected images 130 displayed on the screen S are vibrated. Therefore, an input image from the video supply device 110 or the like is subjected to a predetermined image processing technique. Although the resolution is increased, since the OSD data superimposition on the projection image 130 is image-processed in the preceding stage of the DMD to be shifted (system control unit 10), the character data or the like displayed as the OSD appears blurred. , Characters appear to be crushed.

  As a technique related to OSD display, in Reference Document 1 (Japanese Patent No. 3315557), a plurality of OSD data corresponding to the display state is prepared in consideration of the image resolution of the input signal and the dot clock, and the OSD corresponding to the display state is prepared. Selected data is displayed.

  In Reference Document 2 (Japanese Patent Laid-Open No. 2000-347638), the OSD data is resized according to the image format of the input video and the resolution of the connected display device.

  However, the processing described in References 1 and 2 is not sufficient for increasing the resolution by DMD shift. In other words, shifting the DMD 551 means shifting the video with the OSD data superimposed on the input video signal. Therefore, if the shift amount is not taken into account, the characters are blurred and the collapsed image is projected. 130 appears prominently. Therefore, it is desired that the font data for OSD consider the shift amount of DMD551.

  FIG. 23 shows a simplified schematic diagram of a state in which the DMD551 mirror is arranged. FIG. 24 is a simplified schematic diagram showing a state where the DMD 551 shown in FIG. 23 is periodically shifted by half a pixel. In the example of FIG. 24, a shift of half a pixel is expressed, but the shift amount is not limited to a half pixel, and the cyclic shift amount can be increased.

  The contents displayed as OSD data are mainly character data. FIG. 25 is a simplified schematic diagram showing a state in which OSD character data is displayed on the DMD 551. Originally, ON / OFF, that is, a character shape, is expressed by one dot of the DMD 551, but is simply expressed in FIG.

  FIG. 26 shows a simple schematic diagram in a state where the OSD character data is displayed and the DMD 551 is periodically shifted. As shown in FIG. 26, when the DMD 551 is shifted, characters are blurred. In addition, when the character to be displayed is a character that requires fine expression such as kanji, the character appears to be crushed.

  Therefore, in the present embodiment, the size of a character to be displayed is determined in consideration of the size of one dot (one mirror, the smallest unit that can be expressed) of the DMD 551 and the shift amount of the DMD 551. .

  As shown in FIG. 27, in order to express one character, it is more preferable to configure with a certain number of dot groups than to configure with a small number of dots, considering the appearance when DMD shift is performed. .

  FIG. 28 shows an example in which the characters expressed in FIG. 25 are expressed using dots that are approximately double in length and width. FIG. 29 shows that the characters represented in FIG. 28 are periodically shifted.

  As described above, by setting the character size in consideration of the shift amount of the DMD 551, the OSD data superimposed and displayed on the projection image 130 is blurred even when the DMD shift for high resolution is performed. The OSD display does not look like it is crushed and looks good for the user.

  Further, as described above, when it is not particularly necessary to view a high-resolution video, the DMD 551 can be statically fixed and used without shifting the DMD 551. When the DMD shift is turned off, there is no need to consider the shift amount of the DMD with respect to the OSD data.

  Therefore, when the DMD 551 is set to shift, the OSD data having the character size considering the shift amount of the DMD 551 is used. When the setting is not shifted, the OSD data different from the character size OSD data considering the shift amount of the DMD 551 is used. It is preferred to use data.

  Hereinafter, another embodiment (2) of the image projection apparatus will be described.

  As described above, shifting the DMD 551 means that the video is shifted with the OSD data superimposed on the input video signal. Therefore, if the shift amount is not taken into consideration, the characters are blurred and crushed. Appears prominently in the projected image 130. Therefore, it is desired that the font data for OSD consider the shift amount of DMD551.

  Therefore, in the present embodiment, the following processing is performed. That is, in the resolution enhancement by DMD shift, the video signal is divided into odd frames and even frames before the display data is formed in DMD 551, and the respective frames are allocated and displayed before and after the DMD shift.

  Then, the OSD data is superimposed on the video signal at the stage where the video signal is divided into odd and even frames, and the amount of OSD data is canceled by canceling the DMD shift for one of the frames. By superimposing data whose display position coordinates are shifted, it is possible to avoid being affected by the shift of DMD data.

  In the present embodiment, as shown in FIG. 30, the system control unit 10 includes a video signal dividing unit 10A and a video signal processing unit 10B. First, in the video signal dividing unit 10A, odd frames and even frames. Divide into Next, the video signal processing unit 10B performs video contrast adjustment, brightness adjustment, sharpness adjustment, scaling processing, menu information superposition, and the like on the video signal processed by the video signal dividing unit 10A. At this time, the menu information is superimposed on each of the odd-numbered frame and the even-numbered frame.

  The video signal dividing unit 10A divides the frame into odd frames and even frames, and the video signal processing unit 10B superimposes OSD data on each frame. The periodic constant timing needs to be interlocked with the shift of the DMD 551.

  FIG. 23 shows a simplified schematic diagram of a state in which the DMD551 mirror is arranged. FIG. 31 is a simplified schematic diagram showing a state where the DMD 551 shown in FIG. 23 is periodically shifted by half a pixel. The solid line in FIG. 31 is a reference position before shifting the DMD 551 (odd frame O in this embodiment), and the broken line is a position after shifting the DMD 551 by half a pixel (even frame E in this embodiment). To do.

  The contents displayed as OSD data are mainly character data. As described above, the video signal input from the video terminal is divided into the odd frame O and the even frame E by the video signal dividing unit 10A, and the OSD data is superimposed on each frame by the video signal processing unit 10B. To do.

  First, OSD data is first superimposed on the odd frame O, and OSD character data is displayed on the DMD 551. This is shown in FIG.

  FIG. 32 shows that characters are expressed by turning on / off the mirror for each dot of the DMD 551. Here, the character “T” is represented as an example. In FIG. 32, the position of the upper left corner is the coordinate (0, 0), the coordinate of the position moved one to the right and one downward is (1, 1), and the display start coordinate of the character “T” is (3 2).

FIG. 33 expresses the appearance when the display start position of the odd frame O is displayed as it is without considering the shift of the display start coordinate position of the OSD data in the even frame E.
It can be seen that if the shift is not considered in the even frame E, the characters appear blurred.

  In FIG. 34, the display start position coordinates of the OSD data of the even frame E are decremented by half a pixel vertically and horizontally, and the appearance when the OSD data is superimposed on the video signal by the video signal processing unit 10B is expressed. Yes. In FIG. 34, the position of the upper left corner of the coordinate system (odd frame O) before shifting the DMD 551 indicated by the solid line is the coordinate (0, 0), and the coordinate system (even frame) after the DMD 551 indicated by the broken line is shifted by half a pixel. The position of the upper left end of E) is also the coordinates (0, 0).

  This is because the DMD 551 is shifted after the OSD data is superimposed by the video signal processing unit 10B, so that the reference coordinates as the video signal processing unit 10B do not change.

  The start coordinate of the letter “T” is (3, 2) in the coordinate system before the DMD 551 indicated by the solid line is shifted, and in the coordinate system after the DMD 551 indicated by the broken line is shifted by half a pixel, as described above, In order to decrement by the pixel, (2.5, 1.5) is set.

  The coordinate system of FIG. 34 is based on the idea that the coordinates are reduced by half a pixel for each content to be displayed (here, “T”), but the reference point of the coordinate system after the DMD 551 indicated by the broken line is shifted by half a pixel is used. You may make it handle as (0.5, 0.5). FIG. 35 shows an example in that case.

  The difference between the effects in the case of FIG. 34 and FIG. 35 is that in the case of FIG. 34, high resolution by DMD shift can be set to valid / invalid for each content unit of the same display screen, and in the case of FIG. There is a difference that all of the OSD data in the system is uniformly made to support high resolution.

  In the present embodiment, a single character “T” is taken as an example, but a plurality of characters can be combined and handled as one lump.

  The image projecting apparatus 1 according to the present embodiment described above includes the video signal dividing unit 10A that divides the video signal input from the video terminal into odd frames and even frames, and the odd numbers divided by the video signal dividing unit 10A. For the frame / even frame, the coordinate position information before the DMD shift is recorded at the display coordinate position of the OSD data, and the coordinate position information of the amount to cancel the shift amount of the DMD 551 at the display coordinate position of the OSD data. It is something to keep.

  Thus, even when the resolution is increased by periodically shifting the image display unit, the OSD data superimposed and displayed on the projection surface is blurred and does not appear to be crushed, so that it looks good for the user. OSD display with good quality.

  The above-described embodiment is a preferred embodiment of the present invention, but is not limited thereto, and various modifications can be made without departing from the gist of the present invention.

1, 1A, 1B Image projection device 2 Exterior cover 3 Optical engine 4 Light source unit 5 Color wheel 6 Light tunnel 7 Relay lens 8 Plane mirror 9 Concave mirror 10 System controller 11 Lamp controller 12 Color wheel controller 13 DMD controller 14 Movable unit control unit 15 Fan control unit 16 Intake port 17 Exhaust port 18 Intake fan 19 Exhaust fan 20 Fan 21 Remote control 22 Remote control reception unit 23 Main unit operation unit 24 Input terminal 25 Video signal control unit 26 Non-volatile memory 27 Power supply unit 30 Light source 40 Illumination optical system unit 50 Image display unit 51 Fixed unit 55 Movable unit 551 DMD
60 Projection optical system unit 100 Image projection system 110 Image supply device 111 Input unit 112 Display unit 113 Communication unit 114 CPU
115 RAM
116 Recording unit 120A, 120B Cable 130 Projected image 140 Operator S Screen

JP 2007-248721 A

Claims (9)

A light source that emits light;
An image display unit having a modulation element that forms an image using light from the light source;
An illumination optical unit that guides light from the light source to the image display unit;
A projection optical unit for enlarging and projecting the image formed by the image display unit;
Two image projectors having a modulation element movable control unit that reciprocates the modulation element in a predetermined direction within a predetermined range;
In a state where the projection image of the first image projection device and the projection image of the second image projection device are superimposed,
The modulation element movement control unit of the second image projection apparatus corresponds to an arbitrary position within the predetermined range in which the modulation element movement control unit of the first image projection apparatus reciprocates the modulation element. In addition, after the modulation element is moved, the modulation element is reciprocated in a predetermined range in the predetermined direction.   The predetermined range in which the modulation element movement control unit of the second image projection apparatus reciprocates the modulation element in the predetermined direction is the modulation element movement control unit of the first image projection apparatus. The image projection system according to claim 1, wherein the amount is the same as the predetermined range in which the element is reciprocated in the predetermined direction. The modulation element movement control unit of the first image projection device is configured to reciprocate the modulation element in an oblique direction by approximately half a pixel,
The said modulation element movement control part of a said 2nd image projector is a reciprocation after moving the said modulation element by about 1/4 pixel in the diagonal direction, The reciprocating operation | movement of Claim 1 or 2 characterized by the above-mentioned. Image projection system.   The said image projection apparatus is provided with the setting part which sets whether it is the said 1st image projection apparatus or the said 2nd image projection apparatus, The one in any one of Claim 1 to 3 characterized by the above-mentioned. Image projection system. In a state where the projection image of the first image projection device and the projection image of the second image projection device are superimposed,
5. The modulation element movement control unit of each of the first image projection apparatus and the second image projection apparatus stops a reciprocating operation of the modulation element. 6. The image projection system described.   6. The timing according to claim 1, wherein the modulation element movement control units of the first image projection apparatus and the second image projection apparatus are synchronized with each other in timing for reciprocating the modulation element. An image projection system according to claim 1. When three or more image projection devices are provided, and the third and subsequent image projection devices are third image projection devices,
The modulation element movement control unit of the third image projection apparatus moves the modulation element to an arbitrary position in the predetermined range in which the modulation element movement control unit of the first image projection apparatus reciprocates the modulation element. The image projection system according to claim 1, wherein the modulation element is reciprocated in a predetermined range in the predetermined direction after being moved. A light source that emits light;
An image display unit having a modulation element that forms an image using light from the light source;
An illumination optical unit that guides light from the light source to the image display unit;
A projection optical unit for enlarging and projecting the image formed by the image display unit;
In an image projection apparatus having a modulation element movable control unit that reciprocates the modulation element in a predetermined direction in a predetermined range,
The modulation element movement control unit moves the modulation element to an arbitrary position in the predetermined range in which another image projection apparatus that projects a projection image superimposed on a projection image by the image projection apparatus reciprocates the modulation element. An image projection apparatus, wherein the modulation element is reciprocated within a predetermined range in the predetermined direction after being moved. A light source that emits light;
An image display unit having a modulation element that forms an image using light from the light source;
An illumination optical unit that guides light from the light source to the image display unit;
A projection optical unit for enlarging and projecting the image formed by the image display unit;
Using two image projecting devices having a modulation element movable control unit that reciprocates the modulation element in a predetermined direction within a predetermined range,
A process of projecting the projection image of the first image projection device and the projection image of the second image projection device in a superimposed state;
The modulation element movement control unit of the second image projection apparatus corresponds to an arbitrary position within the predetermined range in which the modulation element movement control unit of the first image projection apparatus reciprocates the modulation element. And a process of reciprocating the modulation element in a predetermined range in the predetermined direction after moving the modulation element.