WO2015029493A1 - 画像投影装置 - Google Patents
画像投影装置 Download PDFInfo
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- WO2015029493A1 WO2015029493A1 PCT/JP2014/061003 JP2014061003W WO2015029493A1 WO 2015029493 A1 WO2015029493 A1 WO 2015029493A1 JP 2014061003 W JP2014061003 W JP 2014061003W WO 2015029493 A1 WO2015029493 A1 WO 2015029493A1
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- light
- display image
- laser
- image
- light beam
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N9/00—Details of colour television systems
- H04N9/12—Picture reproducers
- H04N9/31—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]
- H04N9/3129—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM] scanning a light beam on the display screen
- H04N9/3135—Driving therefor
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B26/00—Optical devices or arrangements for the control of light using movable or deformable optical elements
- G02B26/08—Optical devices or arrangements for the control of light using movable or deformable optical elements for controlling the direction of light
- G02B26/0816—Optical devices or arrangements for the control of light using movable or deformable optical elements for controlling the direction of light by means of one or more reflecting elements
- G02B26/0833—Optical devices or arrangements for the control of light using movable or deformable optical elements for controlling the direction of light by means of one or more reflecting elements the reflecting element being a micromechanical device, e.g. a MEMS mirror, DMD
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B26/00—Optical devices or arrangements for the control of light using movable or deformable optical elements
- G02B26/08—Optical devices or arrangements for the control of light using movable or deformable optical elements for controlling the direction of light
- G02B26/10—Scanning systems
- G02B26/101—Scanning systems with both horizontal and vertical deflecting means, e.g. raster or XY scanners
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
- H04N1/04—Scanning arrangements, i.e. arrangements for the displacement of active reading or reproducing elements relative to the original or reproducing medium, or vice versa
- H04N1/113—Scanning arrangements, i.e. arrangements for the displacement of active reading or reproducing elements relative to the original or reproducing medium, or vice versa using oscillating or rotating mirrors
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/74—Projection arrangements for image reproduction, e.g. using eidophor
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N9/00—Details of colour television systems
- H04N9/12—Picture reproducers
- H04N9/31—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]
- H04N9/3129—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM] scanning a light beam on the display screen
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N9/00—Details of colour television systems
- H04N9/12—Picture reproducers
- H04N9/31—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]
- H04N9/3141—Constructional details thereof
- H04N9/3147—Multi-projection systems
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N9/00—Details of colour television systems
- H04N9/12—Picture reproducers
- H04N9/31—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]
- H04N9/3141—Constructional details thereof
- H04N9/315—Modulator illumination systems
- H04N9/3155—Modulator illumination systems for controlling the light source
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N9/00—Details of colour television systems
- H04N9/12—Picture reproducers
- H04N9/31—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]
- H04N9/3141—Constructional details thereof
- H04N9/315—Modulator illumination systems
- H04N9/3161—Modulator illumination systems using laser light sources
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N9/00—Details of colour television systems
- H04N9/12—Picture reproducers
- H04N9/31—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]
- H04N9/3141—Constructional details thereof
- H04N9/315—Modulator illumination systems
- H04N9/3164—Modulator illumination systems using multiple light sources
Definitions
- the present invention relates to an image projection apparatus that projects an image on an image display surface by raster scanning a plurality of light beams with a scanning mirror.
- an optical scanning apparatus using a polygon mirror or a galvanometer mirror is widely used.
- a small optical scanning device using a MEMS mirror device manufactured using MEMS (Mirco Electro Mechanical Systems) technology is a device that reciprocates a scanning mirror in which components such as elastic beams are integrally formed of silicon or the like by electromagnetic force or electrostatic force, and is a microelectromechanical component that can scan a light beam. .
- An image projection apparatus that uses a MEMS mirror device to display two display images on a screen by a light beam to form one image has been proposed (see, for example, Patent Document 1).
- this apparatus one image having a large area is displayed by connecting two display images displayed by scanning each of two light beams emitted from two light sources so as to slightly overlap each other. Yes.
- Patent Document 1 describes that two display images are connected to each other, but does not describe a countermeasure against a decrease in image quality at the joint between the two display images. Therefore, in the apparatus described in Patent Document 1, the joint between two display images, that is, the boundary between the two display images can be identified with the naked eye as a band-like or linear region, or is conspicuous. Problems arise.
- the present invention has been made to solve the above-described problems of the prior art, and its purpose is to display a plurality of display images displayed by scanning a plurality of light beams as if they are seamless, that is, It is another object of the present invention to provide an image projection apparatus capable of displaying a high-quality image having a large size by connecting the seams so that the seams cannot be identified with the naked eye.
- the image projection apparatus includes a first light source unit that emits a first light beam, a second light source unit that emits a second light beam, and the first light source unit that emits the first light beam.
- a display control unit for controlling a light emission timing of the first light beam and the second light beam emitted from the second light source unit; the first light beam emitted from the first light source unit;
- a scanning mirror that reflects the second light beam emitted from the second light source unit; and a drive unit that drives the scanning mirror, the first light beam and the second light beam being driven by the scanning mirror.
- a scanning mirror unit and the scanning mirror A scanning mirror control unit for controlling the unit, a first photodetector and a second photodetector, and a first light receiving surface of the first photodetector and a second of the second photodetector.
- the first photodetector and the second photodetector are arranged so that a boundary line with the light receiving surface of the first and second display images is parallel to a linear seam of the first display image and the second display image.
- the first light detector receives the first light beam or the second light beam on the first light receiving surface and outputs a detection signal, and the second light detector outputs the detection signal.
- a light beam detecting unit that receives the first light beam or the second light beam and outputs a detection signal to the light receiving surface, and the scanning mirror control unit has a direction orthogonal to the boundary line
- the first light beam having a predetermined number of pixels lined up to the first light receiving surface and the second light receiving surface are irradiated to the first light beam,
- the position of the first display image is adjusted based on the difference between the detection signal output from the first light detector and the detection signal output from the second light detector, and is orthogonal to the boundary line.
- the first detection signal output from the light beam detector is used to indicate the positions of the first display image and the second display image displayed by the scanning of the first light beam and the second light beam. And adjustment based on the difference between the second detection signal and the second detection signal. Therefore, according to the present invention, the first display image and the second display image can be connected as if there is no seam, that is, the seam cannot be identified with the naked eye, and the size is large and the quality is high. Simple images can be displayed.
- FIG. 1 is a block diagram schematically showing a configuration of an image projection apparatus according to Embodiment 1 of the present invention.
- FIG. 3 is a diagram schematically showing a configuration of a first light source unit and a second light source unit of the image projection apparatus according to the first embodiment. It is a figure which shows roughly the structure and function of a MEMS mirror apparatus of the image projector which concerns on Embodiment 1 and 2.
- FIG. 6 is a diagram showing that one image is displayed by raster scanning of two laser beams by the MEMS mirror device of the image projection apparatus according to Embodiment 1.
- FIG. 3 is a diagram schematically showing a configuration of a first light source unit and a second light source unit of the image projection apparatus according to the first embodiment. It is a figure which shows roughly the structure and function of a MEMS mirror apparatus of the image projector which concerns on Embodiment 1 and 2.
- FIG. 6 is a diagram showing that one image is displayed by raster scanning of two laser beams by the MEMS mirror device of
- (A)-(c) is a figure which shows the laser emission timing corresponding to the horizontal drive signal produced
- (A) And (b) is a figure which shows the laser emission timing corresponding to the irradiation position of the perpendicular drive signal produced
- FIG. 1 shows the 1st laser beam detected with the 1st photodetector of the laser beam detection part of the image projector which concerns on Embodiment 1, and a 2nd photodetector.
- (A) to (c) are generated by detecting the first laser beam by the first photodetector and the second photodetector of the laser beam detector of the image projection apparatus according to Embodiment 1.
- FIG. 6 is a diagram schematically showing a configuration of a first light source unit and a second light source unit of an image projection apparatus according to a second embodiment.
- FIG. 10 is a diagram showing that one image is displayed by raster scanning of two laser beams by the MEMS mirror device of the image projection device according to the second embodiment.
- FIG. 1 shows the 1st laser beam detected with the 1st photodetector of the laser beam detection part of the image projector which concerns on Embodiment 2, and a 2nd photodetector.
- (A) to (c) are generated by detecting the first laser beam by the first photodetector and the second photodetector of the laser beam detector of the image projection apparatus according to the second embodiment.
- (A) to (c) are generated by detecting the second laser light by the first light detector and the second light detector of the laser light detection unit of the image projection apparatus according to the second embodiment. It is a figure which shows the relationship between a detection signal and the position of the perpendicular direction of a 2nd display image.
- FIG. 1 is a block diagram schematically showing a configuration of an image projection apparatus 1 according to Embodiment 1 of the present invention.
- the image projector 1 according to the first embodiment is a MEMS mirror device that is a scanning mirror unit that scans a plurality of light beams (for example, a first light beam and a second light beam).
- a display control unit 12 that controls the emission of a light beam according to an input image signal
- a MEMS mirror control unit 13 that is a scanning mirror control unit
- a first laser beam as a first light beam.
- the image projection apparatus 1 according to the first embodiment performs two raster lines on the screen 18 based on the input image signal, thereby two lines aligned in the horizontal direction (horizontal scanning direction) on the screen 18.
- One image (combined image) composed of display images is projected.
- the image signal may be a signal in a format that can be processed by the display control unit 12.
- the input image signal is, for example, an image signal supplied from a device having a function of receiving a broadcast wave (for example, a broadcast receiver, a television, etc.), an image signal from an information recording medium such as an optical disk or a hard disk.
- An information processing device for example, an image signal supplied from a device having a reproduction function (for example, an optical disc player, a car navigation device, a game device, etc.) or an image information downloaded via a network (for example, the Internet) (for example, , An image signal supplied from a personal computer).
- the display control unit 12 includes a buffer memory 121, a drawing control unit 122, a data conversion unit 123, a first laser modulation control unit 124, and a second laser modulation control unit 125. Is provided.
- the display control unit 12 controls the first laser driver 16 and the second laser driver 17 based on the input image signal.
- the drawing control unit 122 writes image data corresponding to the input image signal in the buffer memory 121.
- the buffer memory 121 temporarily stores the written image data. Further, the drawing control unit 122 reads the image data stored in the buffer memory 121 and supplies the read image data to the data conversion unit 123.
- the data conversion unit 123 converts the image data supplied from the drawing control unit 122 into bit data and supplies the bit data to the first laser modulation control unit 124 and the second laser modulation control unit 125.
- the first laser modulation control unit 124 converts the bit data supplied from the data conversion unit 123 into a signal representing the light emission pattern of each color laser, and supplies the signal to the first laser driver 16.
- the first laser driver 16 is based on a signal output from the first laser modulation control unit 124, and includes a red laser 141, a green laser 142, and a blue laser 143 (that is, lasers of respective colors) provided in the first light source unit 14. ) Is generated, and these drive signals are supplied to the red laser 141, the green laser 142, and the blue laser 143, respectively.
- the second laser modulation control unit 125 converts the bit data supplied from the data conversion unit 123 into a signal representing the light emission pattern of each color laser, and supplies the signal to the second laser driver 17.
- the second laser driver 17 is based on a signal output from the second laser modulation control unit 125, and a red laser 151, a green laser 152, and a blue laser 153 (that is, lasers of the respective colors) provided in the second light source unit 15. ) Is generated, and these drive signals are supplied to the red laser 151, the green laser 152, and the blue laser 153, respectively.
- the red laser 141, the green laser 142, and the blue laser 143 convert the red laser light, the green laser light, and the blue laser light into the first combining optical system 144 based on the drive signal supplied from the first laser driver 16.
- the first combining optical system 144 combines the red laser light, the green laser light, and the blue laser light emitted from the red laser 141, the green laser 142, and the blue laser 143 to generate one laser light (beam-like). ), That is, the first laser light L1 as the first light beam is generated.
- the first laser light L1 is applied to the scanning mirror (movable mirror) 114 of the MEMS mirror device 11 through the optical fiber 1447 as an optical path changing member.
- the member that guides the first laser light L1 to the MEMS mirror device 11 is not limited to the optical fiber 1447, and may be another optical path changing member such as a mirror. Further, the first combining optical system 144 may be arranged so as to guide the first laser light L1 directly from the first combining optical system 144 to the MEMS mirror device 11 without using the optical path changing member.
- the red laser 151, the green laser 152, and the blue laser 153 combine the red laser light, the green laser light, and the blue laser light with the second combination based on the drive signal output from the second laser driver 17.
- the light is emitted toward the optical system 154.
- the second synthesis optical system 154 synthesizes the red laser light, the green laser light, and the blue laser light emitted from the red laser 151, the green laser 152, and the blue laser 153, thereby producing one laser beam (beam-like). ), That is, the second laser light L2 as the second light beam is generated.
- the second laser light L2 is applied to the scanning mirror 114 of the MEMS mirror device 11 through the optical fiber 1547 as an optical path changing member.
- the member that guides the second laser light L2 to the MEMS mirror device 11 is not limited to the optical fiber 1547, and may be another optical path changing member such as a mirror. Further, the second combining optical system 154 may be arranged so as to guide the second laser light L2 directly from the second combining optical system 154 to the MEMS mirror device 11 without using the optical path changing member.
- the MEMS mirror device 11 includes a resonance point detection unit 111, a horizontal drive unit 112, a vertical drive unit 113, and a scanning mirror 114.
- the MEMS mirror device 11 drives the scanning mirror 114 to change the direction of the scanning mirror 114, thereby emitting the first laser light L ⁇ b> 1 emitted from the first combining optical system 144 and the second combining optical system 154.
- the second laser beam L2 thus made can be reflected toward the screen 18 at the same time.
- a first display image 18a by the first laser beam L1 and a second display image 18b by the second laser beam L2 are simultaneously formed on the screen 18.
- the MEMS mirror device 11 operates the scanning mirror 114 so that the first laser beam L1 and the second laser beam L2 perform raster scanning on the screen 18 under the control of the MEMS mirror control unit 13. This operation is detected by the resonance point detection unit 111 that detects the resonance state of the horizontal drive unit 112 of the MEMS mirror device 11, and the resonance point detection unit 111 supplies the detection signal to the MEMS mirror control unit 13.
- the MEMS mirror control unit 13 controls the MEMS mirror device 11.
- the MEMS mirror control unit 13 includes a synchronization signal generation unit 131, a servo circuit 132, a horizontal drive signal generation unit 133, a vertical drive signal generation unit 134, and a driver circuit 135.
- the servo circuit 132 includes a detection signal indicating the detection result by the resonance point detection unit 111 provided in the MEMS mirror device 11 and a detection signal indicating the detection result by the laser light detection unit 19 (first detection signals A1, A2 and the first detection signal). 2, the operation of the horizontal drive signal generation unit 133 (or the operation of the horizontal drive signal generation unit 133 and / or the vertical drive signal generation unit 134) is controlled.
- the driver circuit 135 amplifies the drive signal of the MEMS mirror device 11 output from the horizontal drive signal generation unit 133 and the vertical drive signal generation unit 134 to a predetermined level and supplies the amplified signal to the MEMS mirror device 11.
- the synchronization signal generation unit 131 generates a synchronization signal based on the drive signal of the MEMS mirror device 11 controlled by the servo circuit 132 and supplies the generated synchronization signal to the drawing control unit 122.
- FIG. 2 is a diagram schematically showing the components of the optical system of the first light source unit 14 and the second light source unit 15.
- the first light source unit 14 includes a red laser 141, a green laser 142, a blue laser 143, an optical fiber 1447, a condenser lens 1446, and wavelength selective mirrors 1444 and 1445.
- Collimator lenses 1441, 1442 and 1443 are provided.
- the laser beams of the respective colors emitted from the red laser 141, the green laser 142, and the blue laser 143 are converted into parallel light by collimator lenses 1441, 1442, and 1443, respectively.
- the wavelength selective mirrors 1444 and 1445 are constituted by, for example, dichroic mirrors.
- the wavelength selective mirror 1444 transmits the red laser light emitted from the red laser 141 in a direction toward the condenser lens 1446 and reflects the green laser light emitted from the green laser 142 in a direction toward the condenser lens 1446. .
- the wavelength selective mirror 1445 transmits the red laser light and the green laser light emitted from the red laser 141 and the green laser 142 in the direction toward the condenser lens 1446 and collects the blue laser light emitted from the blue laser 143. Reflected in the direction toward the lens 1446.
- the three laser beams of red, green, and blue become one first laser beam L1 by the wavelength selective mirrors 1444 and 1445.
- the condenser lens 1446 causes the first laser beam L1 to enter the incident portion of the optical fiber 1447.
- the first laser beam L1 emitted from the optical fiber 1447 is converted into substantially parallel first laser beam L1 by the collimator lens 1448.
- the first laser light L1 immediately before entering the scanning mirror 114 of the MEMS mirror device 11 is, for example, a plane perpendicular to the screen 18 and parallel to the horizontal direction (X direction) of the screen 18 (that is, FIG. 2 is drawn).
- the MEMS mirror device 11 is irradiated so that the angle ⁇ 1 formed with the perpendicular 11n of the scanning mirror 114 of the MEMS mirror device 11 (scanning mirror 114 when not driven) is 55 ° in a plane parallel to the sheet surface.
- the structure of the said 1st light source part 14 is only an example, and is not limited to the said example.
- the second light source unit 15 includes a red laser 151, a green laser 152, a blue laser 153, an optical fiber 1547, a condenser lens 1546, a wavelength selective mirror 1544, and 1545 and collimator lenses 1541, 1542, and 1543.
- the laser beams of the respective colors emitted from the red laser 151, the green laser 152, and the blue laser 153 are converted into parallel light by collimator lenses 1541, 1542, and 1543, respectively.
- the wavelength selective mirrors 1544 and 1545 are constituted by, for example, dichroic mirrors.
- the wavelength selective mirror 1544 transmits the red laser light emitted from the red laser 151 in the direction toward the condenser lens 1546 and reflects the green laser light emitted from the green laser 152 in the direction toward the condenser lens 1546. .
- the wavelength selective mirror 1545 transmits the red laser light and the green laser light emitted from the red laser 151 and the green laser 152 in the direction toward the condenser lens 1546, and collects the blue laser light emitted from the blue laser 153. Reflected in the direction toward the lens 1546. By the wavelength selective mirrors 1544 and 1545, the three laser beams of red, green, and blue become one second laser beam L2.
- the condenser lens 1546 causes the second laser light L2 to enter the incident portion of the optical fiber 1547.
- the second laser light L2 emitted from the optical fiber 1547 becomes the substantially parallel second laser light L2 by the collimator lens 1548.
- the second laser beam L2 immediately before entering the scanning mirror 114 of the MEMS mirror device 11 is a plane perpendicular to the screen 18 and parallel to the horizontal direction (X direction) of the screen 18 (that is, the paper on which FIG. 2 is drawn).
- the MEMS mirror device 11 is irradiated so that the angle ⁇ 2 formed with the perpendicular 11n of the scanning mirror 114 of the MEMS mirror device 11 (scanning mirror 114 when not driven) is 35 ° in a plane parallel to the MEMS mirror device 11.
- the structure of the 2nd light source part 15 is only an example, and is not limited to the said example.
- FIG. 3 is a diagram schematically showing the structure and function of the MEMS mirror device 11.
- the reference numerals in parentheses are the reference numerals used in the description of the second embodiment to be described later.
- the MEMS mirror device 11 can be rotated around a horizontal scanning center axis (elastic beam) 115 and has a vertical scanning center axis (elastic beam) 116.
- a scanning mirror 114 capable of rotating around the center is provided.
- the scanning mirror 114 is two-dimensionally rotated about each of the horizontal scanning rotation center axis 115 and the vertical scanning rotation center axis 116, whereby the laser beam reflected by the scanning mirror 114 is raster scanned (for example, The first laser beam L1 and the second laser beam L2 can be simultaneously raster scanned).
- the first laser beam L1 and the second laser beam L2 reflected by the MEMS mirror device 11 are irradiated toward the screen 18.
- raster scanning of the laser light applied to the screen 18 is performed.
- X is a coordinate position (pixel position) in the horizontal direction (horizontal scanning direction, that is, X direction)
- Y is a coordinate position (pixel position) in the vertical direction (vertical scanning direction, that is, Y direction).
- the position is represented by P (X, Y).
- the sizes of the first display image 18a and the second display image 18b are images of 640 pixels (horizontal direction) and 480 pixels (vertical direction)
- the first display image 18a and the second display image 18b The light is continuously scanned from the start position P (1, 1) at the upper end of each display image 18b to the end position P (640, 480) at the lower end, whereby the first display image 18a or the second display image 18b.
- One display of the display image 18b is completed.
- FIG. 4 is a diagram showing that one image is displayed by scanning two laser beams by the MEMS mirror device 11 of the image projection apparatus 1 according to the first embodiment.
- the first laser light L1 modulated in accordance with the image signal is transmitted from the start position P1 (1, 1) at the upper end of the first display image 18a to the first display image 18a.
- the second laser light L2 modulated according to the image signal is changed from the start position P2 (1, 1) at the upper end of the second display image 18b to the end position P2 (at the lower end of the second display image 18b).
- the laser light detection unit 19 includes a first light detector 191 having a first light receiving surface and a second light receiving surface having a second light receiving surface, which are adjacent to each other across the detection boundary line 193 and arranged in the horizontal direction. 192 and a two-part photodetector.
- the first light detector 191 and the second light detector 192 output first detection signals A1 and A2 and second detection signals B1 and B2 that are proportional to the levels of the received light.
- the first detection signal A1 and the second detection signal B1 are output signals when the first light detector 191 and the second light detector 192 detect the first light beam L1.
- the first detection signal A2 and the second detection signal B2 are output signals when the first light detector 191 and the second light detector 192 detect the second light beam L2.
- FIGS. 5A to 5C are diagrams showing a horizontal drive signal generated by the horizontal drive signal generation unit 133, a signal having a half period of the horizontal drive signal, and a laser emission timing corresponding to the irradiation position P.
- the horizontal drive signal is, for example, a rectangular wave having a frequency of 20 kHz.
- the amplitude (crest value) of the rectangular waveform is defined as HH and HL.
- Pixel P (X, Y) representing the position of the pixel that is the irradiation position of the laser beam
- Pixel P (X, Y) in the range of Y ⁇ 1 and pixel P (X, Y) in the range of Y> 480 are Out of range is represented for a display image of 640 pixels wide and 480 pixels high.
- the horizontal direction of one row of the display image from P (1,1) to P (640,1) is less than half the period of the horizontal drive signal. Laser light emission is performed, and the light emission time per pixel is 30 nsec.
- FIGS. 6A and 6B are diagrams illustrating the laser emission timing corresponding to the vertical drive signal generated by the vertical drive signal generation unit 134 and the irradiation position P.
- FIG. As shown in FIGS. 6A and 6B, when displaying an image of 30 frames per second, the period of the vertical drive signal is 1/30 seconds, that is, about 33 milliseconds.
- FIG. 6B shows only the laser emission timing of the pixel (that is, P (1, k), ⁇ 49 ⁇ k ⁇ 530) corresponding to the left end of the display image, and other pixels (that is, P (m, k) and m are integers other than 1). Further, as shown in FIG.
- the display period of one frame of the first or second display image is a period (P (1) including P (1,1) to P (1,480). , 1) to P (640, 480)).
- P (1) including P (1,1) to P (1,480).
- P (640, 480) the amplitudes (peak values) of the sawtooth waveform of the vertical drive signal.
- FIG. 7 is a diagram showing the first laser light L1 detected by the first light detector 191 and the second light detector 192 of the laser light detection unit 19 of the image projection apparatus 1 according to the first embodiment. is there.
- the first light beam L 1 having a predetermined number of pixels arranged in the direction orthogonal to the boundary line 193 is converted into the rectangular light receiving surface of the first light detector 191 and the second light detector 192.
- the detection signal time width (pulse width) output from the first light detector 191 and the detection signal time width (pulse width) output from the second light detector 192 at this time.
- the horizontal position of the first display image 18a is adjusted so that the absolute value of the difference from the (width) is minimized.
- the second light beam L2 having a predetermined number of pixels arranged in a direction orthogonal to the boundary line 193 is converted into a rectangular light receiving surface of the first light detector 191 and a rectangular light receiving surface of the second light detector 192.
- the horizontal position of the second display image 18b is adjusted so that the absolute value of is minimized.
- the predetermined number of pixels is nine, and a predetermined number of pixels outside the range of the first display image 18a, for example, P1 (636, 490) to P1 (644, 490).
- the first laser beam L1 is emitted at the emission timing of the nine pixels, and is received by the first photodetector 191 and the second photodetector 192. Note that the number of pixels and the position of the first laser beam L1 detected by the first photodetector 191 and the second photodetector 192 are not limited to the example in FIG.
- FIGS. 8A to 8C show the first laser beam L1 by the first photodetector 191 and the second photodetector 192 of the laser beam detector 19 of the image projection apparatus 1 according to the first embodiment. It is a figure which shows the relationship between the detection signal produced
- the pulse width (time width in the time axis direction) of the detection signal A1 is Aw1
- the pulse width of the detection signal B1 is Bw1.
- the horizontal position of the right end 18c of the first display image 18a is the first light detector 191 and the second light.
- the position of the boundary line 193 of the detector 192 is shifted to the second light detector 192 side from the position in the horizontal direction.
- the servo circuit 132 varies the amplitude HL of the horizontal drive signal so that the pulse width Aw1 and the pulse width Bw1 are equal, that is, the absolute value of the difference between the pulse width Aw1 and the pulse width Bw1 is minimized. Control is performed so that the horizontal position of the right end 18c of the first display image 18a coincides with the horizontal position of the boundary line 193 of the first photodetector 191 and the second photodetector 192.
- FIG. 9 is a diagram illustrating the second laser light L2 detected by the first light detector 191 and the second light detector 192 of the laser light detection unit 19 of the image projection apparatus 1 according to the first embodiment. is there.
- the second laser beam L2 is emitted at a light emission timing of a predetermined number of pixels outside the range of the second display image 18b, for example, 9 pixels from P2 ( ⁇ 3,490) to P2 (5,490), Light is received by the first light detector 191 and the second light detector 192.
- the number of pixels and the position of the second laser light L2 detected by the first photodetector 191 and the second photodetector 192 are not limited to the example in FIG.
- FIGS. 10A to 10C show the second laser beam L2 by the first photodetector 191 and the second photodetector 192 of the laser beam detector 19 of the image projection apparatus 1 according to the first embodiment. It is a figure which shows the relationship between the detection signal produced
- the pulse width of the detection signal A2 is Aw2
- the pulse width of the detection signal B2 is Bw2.
- the horizontal position of the left end 18d of the second display image 18b is the first photodetector 191 and the second light.
- the position of the boundary line 193 of the detector 192 is shifted to the second light detector 192 side from the position in the horizontal direction.
- the servo circuit 132 varies the amplitude HH of the horizontal drive signal so that the pulse width Aw2 and the pulse width Bw2 are equal, that is, the absolute value of the difference between the pulse width Aw2 and the pulse width Bw2 is minimized. Control is performed so that the horizontal position of the left end 18d of the second display image 18b coincides with the horizontal position of the boundary line 193 of the first photodetector 191 and the second photodetector 192.
- the pulse width of the detection signal output from the first light detector 191 and the second light detector 192 of the light beam detector 19 indicates the position in the direction and the horizontal position of the left end 18d of the second display image 18b.
- the amplitude HL and the amplitude HH of the horizontal drive signal are respectively controlled so as to minimize the absolute value of the difference between the pulse width of the second detection signal and the second detection signal.
- both the horizontal position of the right end 18c of the first display image 18a and the horizontal position of the left end 18d of the second display image 18b are
- the boundary line 193 between the first photodetector 191 and the second photodetector 192 can be made to coincide with the horizontal position. Therefore, the right end 18c of the first display image 18a and the left end 18d of the second display image 18b are aligned at the same position in the horizontal direction to form one connected image. For this reason, the first display image 18a and the second display image 18b can be connected so that there is no seam, that is, the seam cannot be identified with the naked eye. Can be displayed.
- FIG. FIG. 11 is a block diagram schematically showing the configuration of the image projection apparatus 2 according to Embodiment 2 of the present invention.
- the image projection apparatus 2 according to the second embodiment is a MEMS mirror apparatus that is a scanning mirror unit that scans a plurality of light beams (for example, a first light beam and a second light beam).
- a display control unit 22 that controls the emission of a light beam according to an input image signal
- a MEMS mirror control unit 23 that is a scanning mirror control unit
- a first laser beam as a first light beam.
- the image projection apparatus 2 according to the second embodiment includes 1 display image composed of two display images arranged in the vertical direction on the screen 28 by raster scanning two laser beams on the screen 28 based on the input image signal. Project two images (combined images).
- the operation of the image projecting device 2 is the same as that of the image projecting device 1 according to the first embodiment, except that it is configured to project one image (combined image) composed of two display images arranged in the vertical direction. is there.
- the display control unit 22 includes a buffer memory 221, a drawing control unit 222, a data conversion unit 223, a first laser modulation control unit 224, and a second laser modulation control unit 225. Is provided.
- the operation of the display control unit 22 is the same as the operation of the display control unit 12 in the first embodiment.
- the first laser modulation control unit 224 converts the bit data supplied from the data conversion unit 223 into a signal representing the light emission pattern of each color laser, and supplies the signal to the first laser driver 26.
- the first laser driver 26 is a drive for driving the red laser 241, the green laser 242, and the blue laser 243 provided in the first light source unit 24 based on a signal output from the first laser modulation control unit 224. Signals are generated, and these drive signals are supplied to the red laser 241, the green laser 242, and the blue laser 243, respectively.
- the second laser modulation control unit 225 converts the bit data supplied from the data conversion unit 223 into a signal representing a laser emission pattern of each color and supplies the signal to the second laser driver 27.
- the second laser driver 27 is a drive for driving the red laser 251, the green laser 252, and the blue laser 253 provided in the second light source unit 25 based on a signal output from the second laser modulation control unit 225. Signals are generated, and these drive signals are supplied to the red laser 251, the green laser 252, and the blue laser 253, respectively.
- the red laser 241, the green laser 242, and the blue laser 243 emit red laser light, green laser light, and blue laser light toward the first synthesis optical system 244.
- the first combining optical system 244 combines the red laser light, the green laser light, and the blue laser light to generate a first laser light L3 as a first light beam.
- the first laser light L3 is applied to the scanning mirror (movable mirror) 214 of the MEMS mirror device 21 through the optical fiber 2447 as an optical path changing member.
- the member that guides the first laser light L3 to the MEMS mirror device 21 is not limited to the optical fiber 2447, and may be another optical path changing member such as a mirror.
- the first combining optical system 244 may be arranged so as to guide the first laser light L3 directly from the first combining optical system 244 to the MEMS mirror device 21 without using the optical path changing member.
- the red laser 251, the green laser 252, and the blue laser 253 emit red laser light, green laser light, and blue laser light toward the second synthesis optical system 254.
- the second combining optical system 254 combines the red laser light, the green laser light, and the blue laser light to generate a second laser light L4 as a second light beam.
- the second laser light L4 is applied to the scanning mirror 214 of the MEMS mirror device 21 through the optical fiber 2547 as an optical path changing member.
- the member that guides the second laser light L4 to the MEMS mirror device 21 is not limited to the optical fiber 2547, and may be another optical path changing member such as a mirror.
- the second combining optical system 254 may be arranged so as to guide the second laser light L4 directly from the second combining optical system 254 to the MEMS mirror device 21 without using the optical path changing member.
- the MEMS mirror device 21 includes a resonance point detection unit 211, a horizontal drive unit 212, a vertical drive unit 213, and a scanning mirror 214.
- the MEMS mirror device 21 emits the first laser light L3 emitted from the first combining optical system 244 and the second combining optical system 254 by driving the scanning mirror 214 to change the direction of the scanning mirror 214.
- the second laser beam L4 thus made can be reflected toward the screen 28 at the same time.
- the first display image 28a by the first laser light L3 and the second display image 28b by the second laser light L4 are simultaneously formed on the screen 28.
- the MEMS mirror device 21 operates the scanning mirror 214 so that the first laser beam L3 and the second laser beam L4 perform raster scanning on the screen 28 under the control of the MEMS mirror control unit 23.
- This operation is detected by the resonance point detection unit 211 that detects the resonance state of the horizontal drive unit 212 of the MEMS mirror device 21, and the resonance point detection unit 211 supplies the detection signal to the MEMS mirror control unit 23.
- the MEMS mirror control unit 23 controls the MEMS mirror device 21.
- the MEMS mirror control unit 23 includes a synchronization signal generation unit 231, a servo circuit 232, a horizontal drive signal generation unit 233, a vertical drive signal generation unit 234, and a driver circuit 235.
- the servo circuit 232 includes a detection signal indicating the detection result by the resonance point detection unit 211 provided in the MEMS mirror device 21 and a detection signal indicating the detection result by the laser light detection unit 29 (first detection signals A3 and A4 and the first detection signal A3). 2, the operation of the vertical drive signal generation unit 234 (or the operation of the horizontal drive signal generation unit 233 and / or the vertical drive signal generation unit 234) is controlled.
- the driver circuit 235 amplifies the drive signal of the MEMS mirror device 21 output from the horizontal drive signal generation unit 233 and the vertical drive signal generation unit 234 to a predetermined level and supplies the amplified signal to the MEMS mirror device 21.
- the synchronization signal generation unit 231 generates a synchronization signal based on the drive signal of the MEMS mirror device 21 controlled by the servo circuit 232 and supplies the generated synchronization signal to the drawing control unit 222.
- FIG. 12 is a diagram schematically showing components of the optical system of the first light source unit 24 and the second light source unit 25.
- the first light source unit 24 includes a red laser 241, a green laser 242, a blue laser 243, an optical fiber 2447, a condensing lens 2446, wavelength selective mirrors 2444 and 2445, and the like.
- Collimator lenses 2441, 2442 and 2443 are provided.
- the laser beams of the respective colors emitted from the red laser 241, the green laser 242, and the blue laser 243 are converted into parallel light by the collimator lenses 2441, 2442, and 2443, respectively.
- the wavelength selective mirrors 2444 and 2445 are constituted by dichroic mirrors, for example.
- the wavelength selective mirror 2444 transmits the red laser light emitted from the red laser 241 in the direction toward the condenser lens 2446 and reflects the green laser light emitted from the green laser 242 in the direction toward the condenser lens 2446. .
- the wavelength selective mirror 2445 transmits the red laser light and the green laser light emitted from the red laser 241 and the green laser 242 in the direction toward the condenser lens 2446, and condenses the blue laser light emitted from the blue laser 243. Reflected in the direction toward the lens 2446.
- the three laser beams of red, green, and blue become one first laser beam L3 by the wavelength selective mirrors 2444 and 2445.
- the condenser lens 2446 causes the first laser light L3 to enter the incident portion of the optical fiber 2447.
- the first laser light L3 emitted from the optical fiber 2447 is converted into substantially parallel first laser light L3 by the collimator lens 2448.
- the first laser light L3 immediately before entering the scanning mirror 214 of the MEMS mirror device 21 is, for example, a plane perpendicular to the screen 28 and parallel to the vertical direction (Y direction) of the screen 28 (that is, FIG. 12 is drawn).
- the MEMS mirror device 21 is irradiated so that the angle ⁇ 3 formed with the perpendicular line 21n of the scanning mirror 214 of the MEMS mirror device 21 (scanning mirror 214 when not driven) is 55 ° in a plane parallel to the sheet surface.
- the structure of the said 1st light source part 24 is only an example, and is not limited to the said example.
- the second light source unit 25 includes a red laser 251, a green laser 252, a blue laser 253, an optical fiber 2547, a condensing lens 2546, a wavelength selective mirror 2544, and 2545 and collimator lenses 2541, 2542, and 2543.
- the laser beams of the respective colors emitted from the red laser 251, the green laser 252, and the blue laser 253 are converted into parallel light by the collimator lenses 2541, 2542, and 2543, respectively.
- the wavelength selective mirrors 2544 and 2545 are constituted by dichroic mirrors, for example.
- the wavelength selective mirror 2544 transmits the red laser light emitted from the red laser 251 in the direction toward the condenser lens 2546 and reflects the green laser light emitted from the green laser 252 in the direction toward the condenser lens 2546.
- the wavelength selective mirror 2545 transmits the red laser light and the green laser light emitted from the red laser 251 and the green laser 252 in the direction toward the condenser lens 2546 and collects the blue laser light emitted from the blue laser 253. Reflected in the direction toward the lens 2546.
- the three laser beams of red, green and blue are converted into one second laser beam L4 by the wavelength selective mirrors 2544 and 2545.
- the condensing lens 2546 causes the second laser light L4 to enter the incident portion of the optical fiber 2547.
- the second laser light L4 emitted from the optical fiber 2547 is converted into substantially parallel second laser light L4 by the collimator lens 2548.
- the second laser beam L4 just before entering the scanning mirror 214 of the MEMS mirror device 21 is a plane perpendicular to the screen 28 and parallel to the vertical direction (Y direction) of the screen 28 (that is, the paper on which FIG. 12 is drawn).
- the MEMS mirror device 21 is irradiated so that the angle ⁇ 4 formed with the perpendicular line 21n of the scanning mirror 214 of the MEMS mirror device 21 (scanning mirror 214 when not driven) is 35 °.
- the structure of the 2nd light source part 25 is only an example, and is not limited to the said example.
- FIG. 3 is a diagram schematically showing the structure and function of the MEMS mirror device 21.
- the MEMS mirror device 21 can be rotated around a horizontal scanning center axis (elastic beam) 215 and has a vertical scanning center axis (elastic beam) 216.
- a scanning mirror 214 that can be rotated around the center is provided.
- the scanning mirror 214 is two-dimensionally rotated about each of the horizontal scanning rotation center axis 215 and the vertical scanning rotation center axis 216, whereby the laser beam reflected by the scanning mirror 214 is raster scanned (for example, The first laser beam L3 and the second laser beam L4 can be simultaneously raster scanned.
- the first laser beam L3 and the second laser beam L4 reflected by the MEMS mirror device 21 are irradiated toward the screen 28.
- raster scanning of the laser light applied to the screen 28 is performed.
- the size of each of the first display image 28a and the second display image 28b is an image of 640 pixels (horizontal direction) and 480 pixels (vertical direction)
- the first display image 28a and the second display image 28b The light is continuously scanned from the start position P (1, 1) at the upper end of each display image 28b to the end position P (640, 480) at the lower end, thereby the first display image 28a or the second display image 28b.
- One display of the display image 28b is completed.
- FIG. 13 is a diagram showing that one image is displayed by scanning two laser beams by the MEMS mirror device 21 of the image projector 2 according to the second embodiment.
- the first laser light L3 modulated in accordance with the image signal is transmitted from the start position P3 (1, 1) at the upper end of the first display image 28a to the first display image 28a.
- the second laser light L4 modulated in accordance with the image signal is shifted from the start position P4 (1, 1) at the upper end of the second display image 28b to the end position P4 (at the lower end of the second display image 28b.
- the laser light detection unit 29 includes a first light detector 291 having a first light receiving surface and a second light detector having a second light receiving surface that are adjacent to each other across the detection boundary line 293 and arranged in the vertical direction. 292 and a two-part photodetector.
- the first light detector 291 and the second light detector 292 output first detection signals A3 and A4 and second detection signals B3 and B4 that are proportional to the respective received light levels.
- the first detection signal A3 and the second detection signal B3 are output signals when the first light detector 291 and the second light detector 292 detect the first light beam L3.
- the first detection signal A4 and the second detection signal B4 are output signals when the first light detector 291 and the second light detector 292 detect the second light beam L4.
- FIGS. 5A to 5C are diagrams showing a horizontal drive signal generated by the horizontal drive signal generation unit 233, a signal having a half period of the horizontal drive signal, and a laser emission timing corresponding to the irradiation position P.
- the horizontal drive signal is, for example, a rectangular wave having a frequency of 20 kHz.
- the amplitude of the rectangular wave is defined as HH and HL.
- Pixel P (X, Y) representing the position of the pixel that is the irradiation position of the laser beam
- Pixel P (X, Y) in the range of Y ⁇ 1 and pixel P (X, Y) in the range of Y> 480 are Out of range is represented for a display image of 640 pixels wide and 480 pixels high.
- the horizontal direction of one row of the display image from P (1,1) to P (640,1) is less than half the period of the horizontal drive signal. Laser light emission is performed, and the light emission time per pixel is 30 nsec.
- FIGS. 6A and 6B are diagrams illustrating the laser emission timing corresponding to the vertical drive signal generated by the vertical drive signal generation unit 234 and the irradiation position P.
- FIG. 6A when displaying an image of 30 frames per second, the period of the vertical drive signal is 1/30 seconds, that is, about 33 milliseconds.
- the display period of one frame of the first or second display image is a period (P (1,1) including P (1,1) to P (1,480). ) To P (640, 480)).
- the amplitudes (peak values) of the sawtooth waveform of the vertical drive signal are defined as VH and VL.
- FIG. 14 is a diagram illustrating the first laser light L3 detected by the first light detector 291 and the second light detector 292 of the laser light detection unit 29 of the image projection apparatus 2 according to the second embodiment. is there.
- the first light beam L 3 having a predetermined number of pixels arranged in a direction orthogonal to the boundary line 293 is converted into a rectangular light receiving surface of the first light detector 291 and the second light detector 292.
- the time width of the detection signal output from the first photodetector 291 the width of the pulse train
- the time width of the detection signal output from the second photodetector 292 The position of the first display image 28a in the vertical direction is adjusted so that the absolute value of the difference from the pulse train width) is minimized.
- a second light beam L4 having a predetermined number of pixels arranged in a direction orthogonal to the boundary line 293 is converted into a rectangular light receiving surface of the first light detector 291 and a rectangular light receiving surface of the second light detector 292.
- the time width of the detection signal output from the first light detector 291 (pulse train width) and the time width of the detection signal output from the second light detector 292 (pulse train width) at this time The position of the second display image 28b in the vertical direction is adjusted so that the absolute value of the difference between them is minimized.
- the predetermined number of pixels is 8, and a predetermined number of pixels outside the range of the first display image 28a, for example, P3 (650, 477) to P3 (650, 484).
- the first laser beam L3 is emitted at the emission timing of the eight pixels, and is received by the first photodetector 291 and the second photodetector 292. Note that the number of pixels and the position of the first laser beam L3 detected by the first photodetector 291 and the second photodetector 292 are not limited to the example in FIG.
- FIGS. 15A to 15C show the first laser beam L3 by the first photodetector 291 and the second photodetector 292 of the laser beam detector 29 of the image projection apparatus 2 according to the second embodiment. It is a figure which shows the relationship between the detection signal produced
- the width of the pulse train of the detection signal A3 (time width in the time axis direction) is Aw3
- the width of the pulse train of the detection signal B3 is Bw3.
- the vertical position of the lower end 18c of the first display image 28a is the same as that of the first photodetector 291 and the second detector 291.
- the second detector 292 is shifted from the vertical position of the boundary line 293 of the second detector 292.
- the servo circuit 232 adjusts the amplitude VL of the vertical drive signal so that the pulse train width Aw3 is equal to the pulse train width Bw3, that is, the absolute value of the difference between the pulse train width Aw3 and the pulse train width Bw3 is minimized.
- the vertical position of the lower end 28c of the first display image 28a is controlled so as to coincide with the vertical position of the boundary line 293 of the first photodetector 291 and the second photodetector 292. .
- FIG. 16 is a diagram illustrating the second laser light L4 detected by the first light detector 291 and the second light detector 292 of the laser light detection unit 29 of the image projection apparatus 2 according to the second embodiment. is there.
- the second laser beam L4 is emitted at a light emission timing of a predetermined number of pixels outside the range of the second display image 28b, for example, 8 pixels from P4 (650, -3) to P4 (650, 4), Light is received by the first light detector 291 and the second light detector 292.
- the number of pixels and the position of the second laser light L4 detected by the first light detector 291 and the second light detector 292 are not limited to the example in FIG.
- 17A to 17C show the second laser light L4 by the first light detector 291 and the second light detector 292 of the laser light detection unit 29 of the image projection apparatus 2 according to the second embodiment. It is a figure which shows the relationship between the detection signal produced
- the width of the pulse train of the detection signal A4 is Aw4
- the width of the pulse train of the detection signal B2 is Bw4.
- the vertical position of the upper end 28d of the second display image 28b is the same as that of the first photodetector 291.
- the second detector 292 is shifted from the vertical position of the boundary line 293 of the second detector 292.
- the servo circuit 232 adjusts the amplitude VH of the vertical drive signal so that the pulse train width Aw4 is equal to the pulse train width Bw4, that is, the absolute value of the difference between the pulse train width Aw2 and the pulse train width Bw2 is minimized.
- the vertical position of the upper end 28d of the second display image 28b is controlled so as to coincide with the vertical position of the boundary line 293 between the first photodetector 291 and the second photodetector 292. .
- the lower end 28c of the first display image 28a displayed by the scanning of the first light beam L3 and the second light beam L4 is vertical.
- the position of the direction and the position of the upper end 28d of the second display image 28b in the vertical direction are represented by the pulse train of the detection signal output from the first photodetector 291 and the second photodetector 292 of the light beam detector 29.
- the amplitude VL and the amplitude VH of the vertical drive signal are controlled so as to minimize the absolute value of the difference between the width and the width of the pulse train of the second detection signal.
- both the vertical position of the lower end 28c of the first display image 28a and the vertical position of the upper end 28d of the second display image 28b are obtained.
- the boundary line 293 between the first photodetector 291 and the second photodetector 292 can be matched with the vertical position. Therefore, the lower end 28c of the first display image 28a and the upper end 28d of the second display image 28b are aligned at the same position in the vertical direction to form one connected image. For this reason, the first display image 28a and the second display image 28b can be connected so that there is no seam, that is, the seam cannot be identified with the naked eye. Can be displayed.
- the image projection apparatus that simultaneously scans two laser beams on the screen has been described.
- three or more display images are arranged in the horizontal direction by simultaneously scanning three or more laser beams on the screen, or three or more display images are arranged in the vertical direction.
- the present invention can also be applied to an image projection apparatus that displays one combined image arranged or one combined image in which four or more display images are arranged in a matrix in the vertical and horizontal directions.
- the present invention also provides various image display functions such as a small laser scan projector, a television, a personal computer, and a display unit that indicates the state of various devices used in automobiles, ships, aircraft, factory facilities, and the like. It is applicable to other devices.
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Abstract
Description
図1は、本発明の実施の形態1に係る画像投影装置1の構成を概略的に示すブロック図である。図1に示されるように、実施の形態1に係る画像投影装置1は、複数の光ビーム(例えば、第1の光ビーム及び第2の光ビーム)を走査する走査ミラー部であるMEMSミラー装置11と、入力される画像信号に応じて光ビームの発光を制御する表示制御部12と、走査ミラー制御部であるMEMSミラー制御部13と、第1の光ビームとしての第1のレーザ光を出射する第1の光源部14と、第2の光ビームとしての第2のレーザ光を出射する第2の光源部15と、第1の光源部14を駆動する第1の光源駆動部である第1のレーザドライバ16と、第2の光源部15を駆動する第2の光源駆動部である第2のレーザドライバ17と、画像表示面としてのスクリーン18と、光ビーム検出部としてのレーザ光検出部19とを備える。実施の形態1に係る画像投影装置1は、入力された画像信号に基づいて2本のレーザ光をスクリーン18上にラスタ走査することによってスクリーン18上に水平方向(水平走査方向)に並ぶ2つの表示画像からなる1つの画像(結合画像)を投影する。画像信号は、表示制御部12が処理可能な形式の信号であればよい。入力される画像信号は、例えば、放送波を受信する機能を備えた装置(例えば、放送受信機、テレビ等)から供給される画像信号、光ディスク又はハードディスク等のような情報記録媒体から画像信号を読み出す再生機能を持つ装置(例えば、光ディスクプレーヤ、カーナビゲ-ション装置、ゲーム装置等)から供給される画像信号、又は、ネットワーク(例えば、インターネット)を経由して画像情報をダウンロードする情報処理装置(例えば、パーソナルコンピュータ)から供給される画像信号等である。
X<1の範囲の画素P(X,Y)、及び、X>640の範囲の画素P(X,Y)、及び、
Y<1の範囲の画素P(X,Y)、及び、Y>480の範囲の画素P(X,Y)は、
横640画素、縦480画素の表示画像に対して、範囲外を表す。図5(b)及び(c)に示されるように、水平駆動信号の半分の周期以下の時間でP(1,1)からP(640,1)までの表示画像の水平方向1行分のレーザ発光が行われ、1画素あたりの発光時間は、30n秒である。
図11は、本発明の実施の形態2に係る画像投影装置2の構成を概略的に示すブロック図である。図11に示されるように、実施の形態2に係る画像投影装置2は、複数の光ビーム(例えば、第1の光ビーム及び第2の光ビーム)を走査する走査ミラー部であるMEMSミラー装置21と、入力される画像信号に応じて光ビームの発光を制御する表示制御部22と、走査ミラー制御部であるMEMSミラー制御部23と、第1の光ビームとしての第1のレーザ光を出射する第1の光源部24と、第2の光ビームとしての第2のレーザ光を出射する第2の光源部25と、第1の光源部24を駆動する第1の光源駆動部である第1のレーザドライバ26と、第2の光源部25を駆動する第2の光源駆動部である第2のレーザドライバ27と、画像表示面としてのスクリーン28と、光ビーム検出部としてのレーザ光検出部29とを備える。実施の形態2に係る画像投影装置2は、入力された画像信号に基づいて2本のレーザ光をスクリーン28上にラスタ走査することによってスクリーン28上に垂直方向に並ぶ2つの表示画像からなる1つの画像(結合画像)を投影する。画像投影装置2の動作は、垂直方向に並ぶ2つの表示画像からなる1つの画像(結合画像)を投影するよう構成されている点を除き、実施の形態1に係る画像投影装置1と同様である。
X<1の範囲の画素P(X,Y)、及び、X>640の範囲の画素P(X,Y)、及び、
Y<1の範囲の画素P(X,Y)、及び、Y>480の範囲の画素P(X,Y)は、
横640画素、縦480画素の表示画像に対して、範囲外を表す。図5(b)及び(c)に示されるように、水平駆動信号の半分の周期以下の時間でP(1,1)からP(640,1)までの表示画像の水平方向1行分のレーザ発光が行われ、1画素あたりの発光時間は、30n秒である。
上記実施の形態1及び2においては、2本のレーザ光をスクリーン上で同時に走査する画像投影装置を説明した。しかし、本発明は、3本以上のレーザ光をスクリーン上で同時に走査することによって、3つ以上の表示画像を水平方向に並べる1つの結合画像、又は、3つ以上の表示画像を垂直方向に並べる1つの結合画像、又は、4つ以上の表示画像を垂直水平方向にマトリクス状に並べる1つの結合画像を表示する画像投影装置にも適用可能である。
Claims (9)
- 第1の光ビームを出射する第1の光源部と、
第2の光ビームを出射する第2の光源部と、
前記第1の光源部から出射される前記第1の光ビーム及び前記第2の光源部から出射される前記第2の光ビームの発光タイミングを制御する表示制御部と、
前記第1の光源部から出射された前記第1の光ビーム及び前記第2の光源部から出射された前記第2の光ビームを反射する走査ミラーと該走査ミラーを駆動させる駆動部とを有し、前記走査ミラーによって前記第1の光ビーム及び前記第2の光ビームを同時に走査することによって、前記第1の光ビームによって形成される第1の表示画像と前記第2の光ビームによって形成される第2の表示画像とを画像表示面上に並べて表示する走査ミラー部と、
前記走査ミラー部を制御する走査ミラー制御部と、
第1の光検知器及び第2の光検知器を含み、前記第1の光検知器の第1の受光面と前記第2の光検知器の第2の受光面との境界線が前記第1の表示画像と前記第2の表示画像との線状の継ぎ目と平行になるように前記第1の光検知器及び前記第2の光検知器が配置され、前記第1の光検知器は前記第1の受光面に前記第1の光ビーム又は前記第2の光ビームを受光して検出信号を出力し、前記第2の光検知器は前記第2の受光面に前記第1の光ビーム又は前記第2の光ビームを受光して検出信号を出力する光ビーム検出部と
を有し、
前記走査ミラー制御部は、
前記境界線に直交する方向に並ぶ予め決められた画素数の前記第1の光ビームを前記第1の受光面及び前記第2の受光面に照射し、このとき前記第1の光検知器から出力される検出信号と前記第2の光検知器から出力される検出信号との差に基づいて、前記第1の表示画像の位置を調整し、
前記境界線に直交する方向に並ぶ予め決められた画素数の前記第2の光ビームを前記第1の受光面及び前記第2の受光面に照射し、このとき前記第1の光検知器から出力される検出信号と前記第2の光検知器から出力される検出信号との差に基づいて、前記第2の表示画像の位置を調整する
ことを特徴とする画像投影装置。 - 前記第1の光検知器から出力される検出信号は、前記第1の受光面に前記第1の光ビーム又は前記第2の光ビームが入射された時間に応じた時間幅を示す検出信号であり、
前記第2の光検知器から出力される検出信号は、前記第2の受光面に前記第1の光ビーム又は前記第2の光ビームが入射された時間に応じた時間幅を示す検出信号であり、
前記走査ミラー制御部による前記第1の表示画像の位置の前記調整は、前記境界線に直交する方向に並ぶ予め決められた画素数の前記第1の光ビームを前記第1の受光面及び前記第2の受光面に照射し、このとき前記第1の光検知器から出力される検出信号の時間幅と前記第2の光検知器から出力される検出信号の時間幅との差の絶対値が最小になるように行われ、
前記走査ミラー制御部による前記第1の表示画像の位置の前記調整は、前記境界線に直交する方向に並ぶ予め決められた画素数の前記第2の光ビームを前記第1の受光面及び前記第2の受光面に照射し、このとき前記第1の光検知器から出力される検出信号の時間幅と前記第2の光検知器から出力される検出信号の時間幅との差の絶対値が最小になるように行われる
ことを特徴とする請求項1に記載の画像投影装置。 - 前記走査ミラー部は、MEMSミラー装置であることを特徴とする請求項1又は2に記載の画像投影装置。
- 前記第1の表示画像と前記第2の表示画像とは水平走査方向に並び、
前記第1の表示画像と前記第2の表示画像との継ぎ目は垂直走査方向の直線状であり、
前記第1の受光面と前記第2の受光面との境界線は垂直走査方向の直線状である
ことを特徴とする請求項1から3までのいずれか1項に記載の画像投影装置。 - 前記走査ミラー制御部が前記走査ミラー部に供給する水平駆動信号は矩形状波形を有し、
前記走査ミラー制御部は、前記水平駆動信号の振幅を変更することによって、前記第1の表示画像の水平走査方向の位置と前記第2の表示画像の水平走査方向の位置を調整する
ことを特徴とする請求項4に記載の画像投影装置。 - 前記第1の表示画像と前記第2の表示画像とは垂直走査方向に並び、
前記第1の表示画像と前記第2の表示画像との継ぎ目は水平走査方向の直線状であり、
前記第1の受光面と前記第2の受光面との境界線は水平走査方向の直線状である
ことを特徴とする請求項1から3までのいずれか1項に記載の画像投影装置。 - 前記走査ミラー制御部が前記走査ミラー部に供給する垂直駆動振動は鋸波状波形を有し、
前記走査ミラー制御部は、前記垂直駆動信号の振幅を変更することによって、前記第1の表示画像の垂直走査方向の位置と前記第2の表示画像の垂直走査方向の位置を調整する
ことを特徴とする請求項6に記載の画像投影装置。 - 前記第1の光検知器及び前記第2の光検知器は、光電変換を行うことによって入射した光に応じた検出信号を出力することを特徴とする請求項1から7までのいずれか1項に記載の画像投影装置。
- 前記第1の表示画像及び前記第2の表示画像の各々は同じ形状の四角形であることを特徴とする請求項1から8までのいずれか1項に記載の画像投影装置。
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