WO2007023916A1 - 投写型ディスプレイ装置 - Google Patents
投写型ディスプレイ装置 Download PDFInfo
- Publication number
- WO2007023916A1 WO2007023916A1 PCT/JP2006/316643 JP2006316643W WO2007023916A1 WO 2007023916 A1 WO2007023916 A1 WO 2007023916A1 JP 2006316643 W JP2006316643 W JP 2006316643W WO 2007023916 A1 WO2007023916 A1 WO 2007023916A1
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- Prior art keywords
- laser
- laser light
- display device
- projection display
- light source
- Prior art date
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Classifications
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B21/00—Projectors or projection-type viewers; Accessories therefor
- G03B21/14—Details
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B21/00—Projectors or projection-type viewers; Accessories therefor
- G03B21/14—Details
- G03B21/20—Lamp housings
- G03B21/2053—Intensity control of illuminating light
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B21/00—Projectors or projection-type viewers; Accessories therefor
- G03B21/14—Details
- G03B21/20—Lamp housings
- G03B21/208—Homogenising, shaping of the illumination light
-
- 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]
- H04N9/3102—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM] using two-dimensional electronic spatial light modulators
- H04N9/3105—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM] using two-dimensional electronic spatial light modulators for displaying all colours simultaneously, e.g. by using two or more electronic spatial light modulators
-
- 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
-
- 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
-
- 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
-
- 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
Definitions
- the present invention relates to a projection display device that projects a laser beam modulated in accordance with input information such as video information and character information on a screen.
- a projection display device and a rear projection display device are known.
- a high-pressure mercury lamp has been used as the light source.
- Laser light is monochromatic light compared to the light from a high-pressure mercury lamp and has a uniform wavefront, so when it enters the human eye, it can be focused on a point on the retina, possibly causing damage to the retina.
- the international standard IEC60825 and the Japanese domestic standard [JIS C6802: 2005] In order to improve the safety of handling laser products, we should set guidelines to be used.
- MPE Maximum Permissible Exposure
- the interlock device works so that the laser does not emit light. It is possible that a malicious person can remove the high-power laser light source and use it for other purposes.
- Patent Document 1 Japanese Patent No. 2994469
- the present invention solves the above-mentioned problems, and one object of the present invention is to provide a projection display device that is safe even if a person directly observes laser light.
- a projection display apparatus includes at least one laser light source, an illumination optical system, at least one spatial light modulation element, a projection optical system, and a laser.
- the illumination optical system irradiates the at least one spatial light modulator with laser light emitted from the laser light source.
- the at least one spatial light modulator modulates the intensity of the laser beam irradiated with the illumination optical system force according to input information.
- the projection optical system projects the laser light modulated by the spatial light modulation element onto a screen.
- the laser drive control unit When the numerical aperture B of the illumination optical system is set, the laser drive control unit satisfies the laser light intensity A (mWZmm 2 ) 1S A ⁇ 686 XB 2 on the spatial light modulator. Set the output power of at least one laser source.
- FIG. 1 is a diagram showing a schematic configuration and an optical path of a projection display apparatus according to Embodiment 1 of the present invention.
- FIG. 2 is a diagram showing a light quantity calculation model and an optical path of the projection display apparatus according to Embodiment 1 of the present invention.
- FIG. 3 is a diagram showing a schematic configuration and an optical path of a projection display apparatus according to Embodiment 2 of the present invention.
- FIG. 4 is a diagram showing a schematic configuration and an optical path of a projection display apparatus according to Embodiment 3 of the present invention.
- FIG. 5A is a configuration diagram showing an example of a reverse voltage generation circuit of the projection display apparatus according to Embodiment 3 of the present invention.
- FIG. 5B is a configuration diagram showing another example of the reverse voltage generation circuit of the projection display apparatus according to Embodiment 3 of the present invention.
- FIG. 6A is a diagram showing a schematic configuration and an optical path of a projection display apparatus according to Embodiment 4 of the present invention.
- FIG. 6B is a configuration diagram of a green laser light source of the projection display apparatus according to Embodiment 4 of the present invention.
- FIG. 7A is a partial configuration diagram when the laser unit in the projection display apparatus according to Embodiment 5 of the present invention is fixed to a casing.
- FIG. 7B is a partial configuration diagram when the laser unit in the projection display apparatus according to Embodiment 5 of the present invention is separated from the casing.
- FIG. 8A is a cross-sectional view showing a can-type semiconductor laser and a wiring board soldered to the wiring board in the projection display apparatus according to Embodiment 6 of the present invention.
- FIG. 8B is a cross-sectional view showing the can-type semiconductor laser and the wiring board removed from the wiring board in the projection display apparatus according to Embodiment 6 of the present invention.
- FIG. 9A is a cross-sectional view showing a can-type semiconductor laser and a wiring board soldered to the wiring board in the projection display device according to Embodiment 7 of the present invention.
- FIG. 9B is a cross-sectional view showing the can-type semiconductor laser and the wiring board removed from the wiring board in the projection display apparatus according to Embodiment 7 of the present invention.
- FIG. 1 is a diagram showing a schematic configuration and an optical path of a projection display apparatus according to Embodiment 1 of the present invention.
- one laser light source that emits laser light in a single wavelength band or a plurality of laser lights having different wavelength bands and at least one laser light emitted from an illumination optical system. Is used with one transmissive spatial light modulator.
- reference numeral 11 denotes a laser light source, which also has a semiconductor laser or semiconductor laser pumped solid-state laser power in a single wavelength band or a plurality of wavelength bands.
- Reference numeral 12 denotes an illumination optical system, which includes a beam homogenizer such as a fly-eye lens and a rod integrator, and a relay optical system that projects light shaped into a laser beam having a uniform light distribution in a rectangular or line shape by the beam homogenizer. . In the illumination optical system 12, it is desirable to provide a diffusion plate in order to make the laser beam uniform.
- Reference numeral 13 denotes a spatial light modulator.
- the spatial light modulator 13 modulates the intensity of the laser light projected by the illumination optical system 2 according to input information such as video information and text information.
- Reference numeral 14 denotes a projection optical system, which projects the laser light modulated by the spatial light modulator 13 onto the screen 15.
- 16 indicates a laser beam.
- Reference numeral 17 denotes a laser drive control unit which controls the output power of the laser light source 11 by controlling the drive current to the laser light source 11.
- the laser light source 11 When a drive current is supplied to the laser light source 11 by the laser drive control unit 17, the laser light source 11 emits laser light, and the laser light 16 emitted from the laser light source 11 has a predetermined light intensity distribution by the illumination optical system 12.
- the spatial light modulator 13 is irradiated as a light beam having a convergence angle.
- the predetermined light intensity distribution means that the spatial modulation area of the spatial light modulator 13 is irradiated almost uniformly, and the predetermined convergence angle is equal to the numerical aperture on the image side of the illumination optical system 12 or projected.
- the numerical aperture on the object side of the optical system 14 is almost equal.
- the laser light 16 modulated according to the image information by the spatial light modulator 3 is enlarged and projected onto the screen 15 through the projection optical system 14. By reflecting or scattering the laser beam 16 by the screen 15, for example, an image can be viewed by an observer.
- FIG. 2 is a diagram showing a light quantity calculation model and an optical path of a projection display device,
- reference numeral 21 denotes an opening, which is a plate having a hole with a diameter of 7 mm. The diameter of the hole in the opening 21 is adjusted to the diameter of the human pupil.
- Reference numeral 22 denotes a lens, which is in close contact with the opening 21.
- Reference numeral 23 denotes a field stop, which is a plate with a hole. The field stop 23 is provided on the focal plane of the lens 22. The diameter of the hole in the field stop 23 is set to be equal to 0.1 ⁇ f, where f is the focal length of the lens 22.
- Reference numeral 24 denotes a photodetector that detects the amount of light passing through the field stop 23.
- Reference numeral 25 denotes a light quantity measuring optical system, which includes an aperture 21, a lens 22, a field stop 23, and a photodetector 24.
- C6 is a correction coefficient based on the size of the light source when a person views the laser beam.
- the size of the light source is given by the viewing angle (radian) at which the light source stretches against the eyes when a person views the laser beam.
- the constant value is determined to be 0.1 radians as the maximum viewing angle (0 max).
- C6 above is the value obtained by dividing the viewing angle of the light source by 0.0015 radians.
- the maximum value of C6 is 66.7 when the viewing angle of the light source is the maximum viewing angle.
- the power of the laser beam that is also incident on the photodetector 24 by the single point force of the spatial light modulator 13 is emitted from one point of the spatial light modulator 13 and projected onto the screen 15 by the projection optical system 14 and the aperture.
- the product of the ratio of the overlap of 21 and the power of the laser beam emitted from the one point It is. Since the maximum viewing angle that should be taken into consideration when examining laser safety is 0.1 radians, the laser light emitted from a point in the region corresponding to the maximum viewing angle of 0.1 radians on the spatial light modulator 13 is The exposure amount can be determined by performing the above calculation.
- the area of the pupil is ⁇ X (3.5 X 10 _3 ) 2 m 2 , and even if laser light is incident on the pupil for 0.25 seconds from a light source with a maximum viewing angle of 0.1 radians.
- the region on the spatial light modulator 13 corresponding to the maximum viewing angle 0.1 radians has a diameter. 0. It is the area inside the circle of 1XS. Therefore, the power of the laser light emitted from the region on the spatial light modulator 13 corresponding to the maximum viewing angle of 0.1 radians is expressed as follows.
- the intensity of the laser light on the spatial light modulator 13 is A (mWZmm 2 )
- the divergence angle of the conical diverging beam from which the single-point force is also emitted from the spatial light modulator 13 is equal to the numerical aperture B on the image side of the illumination optical system 12, the converging beam emitted from the projection optical system 14
- the radius of the pupil plane is approximately S XB, and the ratio of the area of the pupil to the beam cross-sectional area of the convergent beam is
- the light source power with a maximum viewing angle of 0.1 radians is not damaged even when the laser beam is incident on the pupil for 0.25 seconds.
- the laser beam power corresponding to MPE is 66 mW, so ⁇ X (0.05 XS ) 2 XAX (3.5Z (SXB)) 2 to 66
- the laser drive control unit 17 sets the output power of the laser light source 11 so as to satisfy the above.
- FIG. 3 is a diagram showing a schematic configuration and an optical path of a projection display apparatus according to Embodiment 2 of the present invention.
- three laser light sources that emit three laser beams having different wavelength bands and three reflective spaces that are irradiated with three laser beams emitted from the illumination optical system, respectively.
- a light modulation element is used.
- 401R, 401G, and 401B indicate laser light sources that emit red, green, and blue laser beams, respectively.
- 402a indicates a dichroic mirror that transmits red laser light and reflects green laser light
- 402b indicates a dichroic mirror that transmits red laser light and green laser light and reflects blue laser light.
- Reference numeral 404 denotes a laser drive control unit, which controls the output power of each laser light source by controlling the drive current to the three primary color laser light sources 401R, 401G, 401B.
- Reference numeral 403 denotes an illumination optical system that emits laser beams of three primary colors emitted from the dichroic mirror 402b with the optical axes aligned.
- the three primary color laser light sources 401R, 401G, 401B, the dichroic mirrors 402a, 402b, the illumination optical system 403, and the laser horse motion controller 404 are housed in the laser unit 40A.
- Reference numerals 32a and 32b denote dichroic mirrors, which reflect laser light of a specific wavelength and transmit laser light of other wavelengths.
- 32R indicates a mirror.
- Reference numerals 33G, 33B, and 33R denote polarization beam splitters provided for green laser light, blue laser light, and red laser light, respectively.
- Reference numerals 34G, 34B, and 34R denote reflective spatial light modulators that are irradiated with green laser light, blue laser light, and red laser light, respectively, and are preferably reflective liquid crystal panels and micromirror arrays.
- Reference numeral 35 denotes a polarizing dichroic prism, and 36 denotes a projection lens.
- 37 is a laser beam of three primary colors.
- Reference numeral 43A denotes a main control unit that controls the overall operation of the projection display device and switches the power control mode in the laser drive control unit 404 in accordance with an external input.
- the main control unit 43A includes an input information determination unit 431, which is input from the outside. It is determined whether the input information is video information or character information.
- video information means single-color or multi-color image information including three or more values of still image information and moving image information
- character information means single-color binary image information obtained by converting the character code into an image. .
- Reference numeral 44 denotes an outside light sensor, which detects the illuminance of the three primary colors contained in the outside light.
- Reference numeral 45 denotes an operation unit, and various settings and operations are performed by the user through the operation unit 45.
- the red laser light source 401R emits red laser light
- the green laser light source 401G Green laser light is emitted
- the blue laser light source 401B emits blue laser light.
- Laser light 37 emitted from the three primary color laser light sources 401R, 401G, and 401B and transmitted through the dichroic mirror 402b is irradiated to the dichroic mirror 32a by the illumination optical system 403.
- the dichroic mirror 32a reflects only the red laser light among the three primary colors of laser light 37, and the reflected red laser light is reflected by the mirror 32R and then reflected by the polarization beam splitter 33R and reflected. Is incident on the type spatial light modulator 34R. Of the red laser light modulated and reflected by the reflective spatial light modulator 34R, only the laser light whose polarization plane is rotated by 90 ° is transmitted through the power polarization beam splitter 33R. The red laser light transmitted through the polarization beam splitter 33R is reflected by the polarization dichroic prism 35 and projected onto a screen (not shown) by the projection optical system 36.
- the blue laser beam passes through the dichroic mirrors 32a and 32b, is reflected by the polarization beam splitter 33B, and is modulated and reflected by the reflective spatial light modulator 34B. After that, the light passes through the polarization beam splitter 33B, is reflected by the polarization dichroic prism 35, and enters the projection optical system 36.
- the green laser beam passes through the dichroic mirror 32a, is then reflected by the dichroic mirror 32b, is reflected by the polarization beam splitter 33G, and is a reflective spatial light modulator. Incident on 34G.
- the green laser light modulated and reflected by the reflective spatial light modulator 34G passes through the polarization beam splitter 33G and the polarization dichroic prism 35, and enters the projection optical system 35.
- the reflection type spatial light modulators 34G, 34B, 34R are input from the main controller 43A.
- the green, blue, and red signals obtained by color signal processing according to the force information are supplied, respectively, and the reflective spatial light modulators 34G, 34B, and 34R are the green signal, blue signal, and red signal, respectively.
- the green laser beam, blue laser beam, and red laser beam are modulated according to
- the output powers of the red laser light source, the green laser light source, and the blue laser light source are determined according to the relative luminous sensitivity of the human eye, and the three primary colors are emitted simultaneously.
- the output ratio will be recognized as white for human eyes.
- the intensity of the laser light on the reflective spatial light modulator 34G is Ag
- the intensity of the laser light on the reflective spatial light modulator 34B is Ab
- the reflective spatial light modulator 34R is the intensity of the laser light on the reflective spatial light modulator 34R.
- the laser drive control unit 404 sets the output power of the three primary color laser light sources 401G, 401B, 401R (first power control mode). As a result, it is possible to realize a projection display device that can avoid damage to the retina together with human reflection and can easily adjust the color balance of light in different wavelength bands.
- the laser drive control unit 404 uses the green laser on the reflective spatial light modulator 34G. Intensity of light Only Ag should satisfy Ag ⁇ 686 XB 2. Set the output power of the green laser light source 40 1G and stop the laser emission of the other red laser light source 401R and blue laser light source 401B. (Second power control mode). As a result, it is possible to realize a brighter projection display device that is monochromatic (green) but has improved contrast.
- the main control unit 43A sends an instruction to set the first power control mode to the laser drive control unit 404.
- an instruction to set the second power control mode is sent to the laser drive control unit 404.
- the main control unit 43A outputs the output power of a laser light source that emits a laser beam having a color corresponding to the color of light having the highest illuminance detected by the external light sensor 44 among the three primary color lights.
- An instruction to lower (third power control mode) according to the illuminance detected by the optical sensor 44 is sent to the laser drive control unit 404. Thereby, the contrast can be improved according to the color balance of the external light.
- the main control unit 43A in response to an instruction input from the operation unit 45 by the user, the first power control mode, the second power control mode, and the third power control mode Then, an instruction to set the deviation is sent to the laser drive control unit 404.
- the video display emphasizes color balance
- the character display power emphasizes contrast
- Z or letter display can be selected freely.
- a reflective spatial light modulator 34R, 34G, and 34B a reflective liquid crystal panel, a microphone mirror array, or the like can be used.
- a transmissive liquid crystal panel is used as the spatial light modulator, the aperture ratio is low, and the light output of the light source is increased, so that the size of the projection display device cannot be obtained.
- a small and safe projection display device can be realized by using a reflective spatial light modulation element having a high aperture ratio as the spatial light modulation element.
- Embodiment 3 of the present invention has a configuration for preventing the laser light source from being removed from the apparatus and diverting it to other uses only with the safety that can avoid damage to the retina in combination with the human reflex action.
- three laser light sources that emit three laser beams having different wavelength bands and one transmission type that is irradiated with three laser beams emitted from the illumination optical system are used.
- a spatial light modulator is used.
- FIG. 4 is a diagram showing a schematic configuration and an optical path of a projection display apparatus according to Embodiment 3 of the present invention.
- elements having the same configurations and functions as those of FIG. 3 referred to in the second embodiment are denoted by the same reference numerals and description thereof is omitted. In the following, differences from the second embodiment will be mainly described.
- the projection display apparatus of the third embodiment includes a laser unit 40B and The transmissive spatial light modulator 41, the projection optical system 42, the main control unit 43A, the external light sensor 44, and the operation unit 45 are included.
- the laser unit 40B, the transmissive spatial light modulation element 41, and the projection optical system 42 are housed in a housing described later with reference to FIGS. 5A and 5B.
- the laser unit 40B includes laser light sources 401R, 401G, and 401B composed of semiconductor lasers of three primary colors, dichroic mirrors 402a and 402b, an illumination optical system 403, a laser horse motion ff3 ⁇ 4 ⁇ ⁇ 404, and a reverse voltage.
- the generating rod 405 and the switching rods 406R, 406G, and 406B are collected in the yarn.
- the reverse voltage generation unit 405 and the switching units 406R, 406G, and 406B which are characteristic configurations of the third embodiment, will be described.
- the reverse voltage generator 405 generates a reverse voltage (for example, 2 to 5 volts) equal to or greater than the breakdown voltage of the laser light sources 401R, 401G, 401B when the laser unit is separated from the housing.
- the three primary color laser light sources 401R, 401G, and 401B are marked. This breakdown voltage is larger than the maximum rated reverse voltage of the semiconductor laser!
- Switching units 406R, 406G, and 406B switch between laser drive control 404 and three primary color laser light sources 401R, 401G, and 401B when driving the laser light source in response to the laser ONZOFF signal from laser drive control unit 404.
- the reverse voltage generator 405 and the three primary color laser light sources 401R, 401G, and 401B are connected.
- FIG. 5A is a configuration diagram showing an example of the reverse voltage generation circuit 405 shown in FIG.
- 51 indicates a laser unit corresponding to 40B in FIG. 4
- 52 indicates a housing.
- the reverse voltage generator 405A includes a storage battery 53, a battery holder 54, a negative electrode conductor plate 55, a positive electrode conductor 56, and a stopper 57.
- the storage battery 53 is a button-type storage battery, and an alkaline storage battery such as a nickel-cadmium storage battery or a nickel-hydrogen storage battery, or a lithium ion storage battery can be used.
- an alkaline storage battery such as a nickel-cadmium storage battery or a nickel-hydrogen storage battery, or a lithium ion storage battery can be used.
- a button-type storage battery is illustrated, but a cylindrical storage battery may be used.
- the battery holder 54 is fixed to the inner bottom surface of the laser unit 51, accommodates the storage battery 53, and is connected to a negative electrode conductor plate 55 provided on one side of the negative electrode of the storage battery 53. With the battery voltage between T1 and the positive electrode conductor plate 56 provided on the other side of the positive electrode of the storage battery 53 connected to the terminal T2 as a reverse voltage, the switching units 406R, 406G, Supplied to 406B.
- the negative electrode conductor plate 55 is formed in a plate panel shape, and is always in contact with the negative electrode of the storage battery 53 by a panel force.
- the strobe 57 is made of an electrically insulating material such as hard grease, and has a T-order vertical cross-sectional shape including an upright part 571 and a bottom part 572.
- the upright portion 571 of the stock bar 57 is inserted between the positive electrode plate 56 and the positive electrode of the storage battery 53 through the opening provided at the bottom of the casing 52 and the opening provided at the bottom of the laser unit 51. It is held by the panel force of the negative electrode conductor plate 55 of the battery holder 54 energized via the storage battery 53.
- the bottom portion 5 72 of the stopper 57 is in contact with the outer bottom surface of the housing 52.
- the stopper 57 keeps the bottom 572 in contact with the outer bottom surface of the casing 52, so that the positive electrode of the storage battery 53 is Abutting against the positive electrode conductor plate 56 of the battery holder 54, a reverse voltage is generated between the terminal T1 and the terminal T2.
- the reverse voltage is applied to the laser light sources 401R, 401G, and 401B via the switching units 406R, 406G, and 406B, so that the laser light sources 401R, 401G, and 401B are destroyed.
- an electric double layer capacitor is used instead of the force using the storage battery 53.
- FIG. 5B is a configuration diagram showing another example of the reverse voltage generation unit 405 shown in FIG.
- the reverse voltage generator 405B is composed of a coin 61, a permanent magnet 62, a none-no-reda 63, a neon 64, a magnet holder 65, a stopper 66, a roller 67, a metal wire 68, It consists of a wire fixture 69 and
- the coil 61 has a terminal T1 and a terminal T2, and is fixed to the inner bottom surface of the laser unit 51.
- the permanent magnet 62 is restricted in movement in the left-right direction of the drawing by the magnet holder 65 urged by the panel 64 accommodated in the panel holder 63 and is pressed downward.
- the stopper 66 is inserted and held between the upper part of the coil 61 and the north pole side of the permanent magnet 62, and one end of the stopper 66 is connected to one end of the metal wire 68.
- the other end of the metal wire 68 is loosely contacted with the laser unit 51 and tightly fitted with the housing 52. It is bonded to the outer surface through the hollow part of the tool 69 by soldering or the like.
- the stopper 66 Since the wire is fixed by the wire fixing tool 69 via the spacer 68, it moves to the left and moves downward by the roller 67, and the force between the N pole side of the permanent magnet 62 and the upper part of the coil 61 is also reduced. Exit. As a result, the permanent magnet 62 is pushed downward by the biasing force of the panel 64, passes through the coil 61, and falls onto the inner bottom surface of the housing 52 from the opening 51a provided at the bottom of the laser unit 51. .
- a malicious person can remove a high-power laser light source by destroying the laser light source when the housing force laser unit is separated. It can be prevented from being diverted to other uses.
- FIG. 6A is a diagram showing a schematic configuration and an optical path of a projection display apparatus according to Embodiment 4 of the present invention.
- elements having the same configurations and functions as those in FIG. 4 referred to in Embodiment 3 are denoted by the same reference numerals and description thereof is omitted.
- the fourth embodiment is different from the third embodiment in that the reverse voltage generation unit and the switching unit are deleted, and the power source is simply removed when the laser unit including the green laser light source is removed from the apparatus.
- the green laser light source is configured so that it cannot emit laser light just by supplying it.
- the projection display apparatus of the fourth embodiment includes a laser unit 40C, a transmissive spatial light modulation element 41, a projection optical system 42, a main control unit 43B, and an external light sensor. 44 and an operation unit 45.
- the laser unit 40C accommodates laser light sources 401R, 401G, 401B made of semiconductor lasers of three primary colors, dichroic mirrors 402a, 402b, an illumination optical system 403, and a laser horse motion ff3 ⁇ 43 ⁇ 4 .
- laser light sources 401R, 401G, 401B made of semiconductor lasers of three primary colors, dichroic mirrors 402a, 402b, an illumination optical system 403, and a laser horse motion ff3 ⁇ 43 ⁇ 4 .
- the green laser light source 401G which is a characteristic configuration of the fourth embodiment will be described.
- FIG. 6B is a configuration diagram of the green laser light source 401G of FIG. 6A.
- the green level The one light source 401G includes an infrared semiconductor laser (IR) 4011, a rare earth-doped optical fiber 4012, a second harmonic generation element (SHG) 4013, a Peltier element 4014, and a temperature sensor 4015.
- IR infrared semiconductor laser
- SHG second harmonic generation element
- Peltier element 4014 a temperature sensor 4015.
- the infrared semiconductor laser 4011 also has an infrared semiconductor laser power that emits an infrared laser beam having a wavelength of 915 nm for excitation, for example.
- the rare earth-doped optical fiber 4012 is doped with, for example, ytterbium as a rare earth element, and the rare earth element is excited by infrared laser light emitted from the infrared semiconductor laser 4011 to emit laser light having a wavelength of, for example, 1064 nm.
- the second harmonic generation element 4013 receives the infrared laser light amplified and emitted from the rare earth-doped optical fiber 4012, converts the wavelength to green laser light that is the second harmonic, and emits it.
- the second harmonic generation element 4013 is configured to perform phase matching at a predetermined temperature lower than normal temperature, that is, to perform wavelength conversion efficiently.
- the Peltier element 4014 cools the second harmonic generation element 4013 to a predetermined temperature in accordance with the Peltier control signal from the main control unit 43B.
- the temperature sensor 4015 detects the temperature of the second harmonic generation element 4013 and sends a temperature signal indicating the detected temperature to the main control unit 43B.
- the main control unit 43B sends a Peltier control signal to the Peltier element 4015 so that the temperature of the second harmonic generation element 4013 becomes a predetermined temperature lower than the normal temperature. Do.
- the laser unit 40C including the green laser light source 401G configured as described above is taken out from the apparatus, the temperature control of the second harmonic generation element 4013 by the main control unit 43B is not performed, and the second harmonic Since the generation element 4013 is not phase-matched, the laser emission of the green laser light source 401G remains stopped.
- the temperature of the second harmonic generation element 4013 is adjusted to a low temperature that is the phase matching temperature. Since the green laser light source 401G cannot emit light, it is possible to prevent a malicious person from removing the high-power laser light source and diverting it to other uses.
- FIG. 7A shows a laser display in the projection display apparatus according to Embodiment 5 of the present invention. It is a partial block diagram in case the knit is being fixed to the housing
- the fifth embodiment is different from the fourth embodiment in that when the Peltier element and the temperature sensor of the green laser light source are deleted and the laser unit including the green laser light source is removed from the apparatus, the rare-earth doped light By cutting the fiber, the green laser light source is configured so that it cannot emit laser light.
- differences from the fourth embodiment will be mainly described.
- a laser unit 71 includes a green laser light source including an infrared semiconductor laser 73, a rare earth-doped optical fiber 74, and a second harmonic generation element 75, a metal wire 76, and a wire fixture. 77, and is fixed to the inner bottom surface of the casing 72.
- the metal wire 76 has a ring through which the rare earth-doped optical fiber 74 is passed at one end, and the other end is bonded to the outer surface via a hollow portion of the wire fixture 77 by soldering or the like.
- the metal wire 76 has a sufficiently large strength compared to the strength of the rare earth-added optical fiber 74.
- the wire fixture 77 has the same configuration and function as the wire fixture 69 of FIG. 5B referred to in the third embodiment.
- FIG. 7B is a partial configuration diagram when the laser unit 71 shown in FIG. 7A is separated from the housing 72.
- elements having the same configuration and function as in FIG. 7A are denoted by the same reference numerals, and description thereof is omitted.
- the metal wire 76 is fixed to the wire fixture 77, so that a ring provided at one end of the metal wire 76 is rare.
- the earth-doped optical fiber 74 is cut.
- the laser unit 71 when the laser unit 71 is removed from the casing 72, it is indirectly connected to the casing 72, that is, via the metal wire 76 and the wire fixture 77. Since a part of the rare-earth doped optical fiber 74 is cut and the green laser light source cannot emit light, a malicious person can remove the high-power laser light source and use it for other purposes. Can be prevented.
- FIG. 8A is a cross-sectional view showing a can-type semiconductor laser and a wiring board soldered to the wiring board in the projection display apparatus according to Embodiment 6 of the present invention.
- the semiconductor laser of the sixth embodiment is applied to the three primary color laser light sources of the first to third embodiments, and the red laser light source and the blue laser light source of the fourth and fifth embodiments.
- the laser light source is a power source that fixes the N side of the PN junction of the laser diode chip 83 on the common terminal 82 connected to the stem 81 and penetrates the P side of the laser diode chip 83 and the stem 81.
- a can type semiconductor laser power is also obtained in which the terminal 84 is internally connected by a metal wire 85 and a cap 87 with a window 86 is mounted on the stem 81 to seal the laser diode chip 83.
- the semiconductor laser three terminals including a common terminal 82 and a power supply terminal 84 are inserted into corresponding holes of the wiring board 88 and soldered to a wiring land on the back surface of the wiring board 88 to be mounted.
- the power supply terminal 84 has a notch 841 that partially reduces the strength of the power supply terminal 84 in the semiconductor laser body.
- FIG. 8B is a cross-sectional view showing a can-type semiconductor laser and a wiring board from which the wiring board force has also been removed in the projection display apparatus according to Embodiment 6 of the present invention.
- the solder which adhered the three terminals of the semiconductor laser to the wiring land on the back surface of the wiring board 88 is melted by heating, and the solder is removed and removed from the wiring board 88.
- the external force is applied to the notch 841 of the power supply terminal 84, so that the power supply terminal 84 is cut off.
- the metal material that forms the power supply terminal 84 is made of a material that is weaker than the metal material that forms the other terminals. The effect of state 6 is even greater.
- the power source terminal 84 of the semiconductor laser is cut inside the laser body by the external force applied when the semiconductor laser is removed from the wiring board 88, and the semiconductor laser is supplied to the semiconductor laser. Since power supply becomes impossible, it is possible to prevent a malicious person from removing the high-power laser light source and diverting it to other uses.
- FIG. 9A is a cross-sectional view showing a can-type semiconductor laser and a wiring board soldered to the wiring board in the projection display apparatus according to Embodiment 7 of the present invention.
- elements having the same configuration as in FIG. 8A referred to in Embodiment 6 are assigned the same reference numerals, and descriptions thereof are omitted.
- the semiconductor laser of the seventh embodiment includes the three primary color laser light sources of the first to third embodiments, and Applies to red and blue laser light sources of forms 4 and 5.
- the seventh embodiment differs from the sixth embodiment in the structure of the power supply terminal and the manner of adhesion to the wiring board.
- FIG. 9A when mounted on the substrate, only with respect to the power supply terminal 91 of the semiconductor laser, in the corresponding insertion hole of the wiring board 88 and in the periphery of the insertion hole on the substrate surface, is cured by heat or ultraviolet light.
- a resinous resin material 92 is applied, and the three terminals of the semiconductor laser are inserted into the corresponding holes of the wiring board 88, and the power supply terminal 84 is connected to the wiring board by heating or irradiating the resin material 92 with ultraviolet rays. Fixed to 88.
- the resin material 92 of the wiring board 88 holds the power supply terminal 91 with a force greater than the force with which the stem 81 holds the power supply terminal 91.
- FIG. 9B is a cross-sectional view showing a can-type semiconductor laser and a wiring board from which the wiring board force is also removed in the projection display apparatus according to Embodiment 7 of the present invention.
- the power that the wiring board 88 holds the power terminal 91 is greater than the force that the stem 81 holds the power terminal 91.
- the power of the laser will also be lost and stay on the wiring board 88, power supply to the semiconductor laser will become impossible, and a malicious person will be able to remove the high-power laser light source and use it for other purposes. Can be prevented.
- the eighth embodiment of the present invention relates to a method for setting the numerical aperture B on the image side of the illumination optical system of the first to seventh embodiments.
- the numerical aperture B on the image side of the illumination optical system is set to 0.25 or less than 0.25 in order to realize a low-cost and small projection display device.
- the fact that the numerical aperture B on the image side of the illumination optical system is set to 0.25 or less than 0.25 indicates that the intensity of the laser light on the spatial light modulator is derived from (Equation 5) derived in Embodiment 1.
- an image transmitted to the spatial light modulation element An image is displayed by forming an image of the laser light modulated in accordance with the color signal with the projection lens.
- the projection display device of the present invention is independent of the presence or absence of the spatial light modulation element and the laser light source and the illumination optics. Also included are projection display devices that perform color illumination using only the system, and projection display devices that perform color illumination on liquid crystal panels.
- a projection display device includes at least one laser light source, an illumination optical system that irradiates laser light emitted from the laser light source, and laser light emitted from the illumination optical system. At least one spatial light modulation element that modulates the intensity according to input information, a projection optical system that projects laser light modulated by the spatial light modulation element onto a screen, and a numerical aperture B of the illumination optical system. If set, the laser drive control unit sets the output power of the at least one laser light source so as to satisfy the intensity A (mWZmm 2 ) force A ⁇ 686 XB 2 of the laser light on the spatial light modulator It is characterized by having.
- a projection display device can be provided.
- the at least one laser light source is N laser light sources that respectively emit N laser lights having different wavelength bands, and the at least one spatial light.
- the modulation element is preferably a single spatial light modulation element that modulates the intensity of N laser beams with different wavelength bands irradiated from the illumination optical system according to the input information.
- N laser light sources emitted from N laser light sources having different wavelength bands are modulated according to input information by one spatial light modulator and projected onto the screen.
- a projection display device can be configured.
- the at least one laser light source is N laser light sources that respectively emit N laser beams having different wavelength bands, and the at least one spatial light.
- the modulation element modulates the intensities of the N laser beams with different wavelength bands irradiated from the illumination optical system according to the input information.
- N spatial light modulation elements are preferred.
- N laser light sources emitted from N laser beams having different wavelength bands are modulated according to input information by the N spatial light modulators and projected onto the screen.
- a projection display device can be configured.
- the laser drive control unit adds the intensities on the spatial light modulator of each of the N laser beams having different wavelength bands. It is preferable to have a first power control mode for setting the output powers of the N laser light sources so that the intensity A satisfies A 686 XB 2 .
- the laser drive control unit includes a laser beam having a wavelength band with the highest relative visibility among the N laser beams having different wavelength bands.
- the output power of the laser light source that emits the laser light having the wavelength band with the highest relative luminous sensitivity is set so that the intensity A on the spatial light modulation element satisfies the A ⁇ 686 XB 2 It is preferable to have a second power control mode for stopping the laser emission of the laser light source.
- the projection display apparatus further includes an input information determination unit that determines whether the input information is video information or character information, and the laser drive control unit includes the input information When the information determination unit determines that the input information is video information, the first power control mode is set, and when the input information determination unit determines that the input information is character information, It is preferable to set the second power control mode.
- the input information determination unit determines whether the input information is the power of video information or character information, and displays video with emphasis on color balance according to the determination result. Power It is possible to automatically select whether to display characters with emphasis on contrast.
- the projection display device further includes an external light sensor for detecting illuminance of the light having a different wavelength band included in the external light, and the laser drive control unit is configured to output the N laser lights.
- the output power of the laser light source that emits the laser light having the wavelength band corresponding to the wavelength band of the light with the highest illuminance detected by the external light sensor is set to the illuminance detected by the external light sensor. It is preferred to have a third power control mode that lowers accordingly.
- the projection display apparatus further includes an operation unit to which an instruction from a user is input, and the laser drive control unit is configured to perform the operation according to an instruction input from the operation unit by a user. It is preferable to set one of the first power control mode, the second power control mode, and the third power control mode.
- the user when the user inputs an operation unit force instruction, the user can display video according to color balance, character display based on contrast, and color balance of external light. You can freely choose between video with improved contrast and Z or text display.
- the numerical aperture B of the illumination optical system is 0.
- the intensity of the laser light A on the spatial light modulator is preferably less than 43m WZmm 2 or 43mWZmm 2.
- the numerical aperture of the optical system exceeds 0.25, the lens configuration becomes complicated and the size of the lens increases.
- the numerical aperture B on the image side of the illumination optical system is set to 0. 25 or 0. and less than 25, thus the intensity of the laser light a on the spatial light modulator 43MWZmm 2 or may be to less than 43MWZmm 2, cut with avoiding damage to the retina together with reflective action of human, A low-cost and compact projection display device can be realized.
- the illumination optical system projects a beam homogenizer for uniformizing a light amount distribution of laser light, and a light amount distribution made uniform by the homogenizer onto the spatial light modulator. It is preferable to include a relay optical system Yes. In this case, it is preferable that the illumination optical system includes a diffusion plate.
- the laser light emitted from the laser light source is shaped into a rectangular or line-shaped laser light having a uniform light amount distribution, and illumination light with high brightness uniformity is converted into a spatial light modulation element. Can be irradiated on top.
- the projection display apparatus further houses at least the laser light source and the illumination optical system, and at least the laser unit, the spatial light modulator, and the projection optical system.
- a reverse voltage generator that generates a reverse voltage equal to or greater than the breakdown voltage of the laser light source when the laser unit is separated from the casing and applies the reverse voltage to the laser light source;
- the laser light source includes a switching unit that connects the laser light source and the laser drive controller when driving the laser light source, and connects the laser light source and the reverse voltage generator when the laser light source is not driven.
- the laser light source is preferably a semiconductor laser or a semiconductor laser pumped solid-state laser power
- the breakdown voltage is preferably a reverse voltage that is greater than the maximum rated reverse voltage of the semiconductor laser.
- the reverse voltage generation unit includes a storage battery or an electric double layer capacitor, and the laser light source uses a charge voltage of the storage battery or the electric double layer capacitor as the reverse voltage. It is preferable to apply to.
- the reverse voltage generation unit is a permanent generator that generates a voltage by moving the coil and the coil when the casing force and the laser unit are separated from each other. It is preferable that a voltage generated in the coil is applied to the laser light source as the reverse voltage.
- the at least one laser light source includes a semiconductor laser that emits infrared light for excitation, and a rare earth element by the semiconductor laser.
- a rare earth-doped optical fiber in which the element is optically excited a second harmonic generation element that converts the wavelength of infrared light emitted from the rare earth-doped optical fiber into green light, and the second harmonic generation element at room temperature.
- a green laser light source comprising a Peltier element that cools to a lower predetermined temperature and a temperature sensor that detects the temperature of the second harmonic generation element, wherein the second harmonic generation element is at the predetermined temperature.
- the second harmonic generation element is at the predetermined temperature.
- the temperature of the second harmonic generation element is not adjusted to the low temperature that is the phase matching temperature, and the green laser light source is Since it becomes impossible to emit light, it is possible to prevent a malicious person from removing the high-power laser light source and diverting it to other uses.
- the at least one laser light source includes a semiconductor laser that emits infrared light for excitation, and a rare earth element in which the rare earth element is optically excited by the semiconductor laser.
- a green laser light source including an optical fiber and a second harmonic generation element that converts the wavelength of infrared light emitted from the rare earth-doped optical fiber into green light
- the projection display device further includes at least the projection display device
- a laser unit that houses a laser light source and the illumination optical system; and a housing that houses at least the laser unit, the spatial light modulation element, and the projection optical system. It is indirectly fixed to the housing through an opening provided in the laser unit, and the housing force is removed. Is It is preferred, configured to be disconnected when.
- the laser light source has an N side of a PN junction of a laser diode chip fixed on a common terminal connected to a stem, and the P side of the laser diode chip and the stem A power source terminal penetrating through a metal wire is internally connected with a metal wire, a cap with a window is mounted on the stem, and the laser diode chip is sealed, and the semiconductor laser is removed from the wiring board.
- the power supply terminal it is preferable to reduce the strength of the power supply terminal inside the laser body so that the power supply to the laser diode chip becomes impossible.
- the power supply terminal has a notch for cutting the power supply terminal inside the laser body by an external force.
- the laser light source has an N side of a PN junction of a laser diode chip fixed on a common terminal connected to a stem, and the P side of the laser diode chip and the stem A power source terminal penetrating through a metal wire is internally connected with a metal wire, a cap with a window is mounted on the stem, and the laser diode chip is sealed, and the semiconductor laser is removed from the wiring board.
- the stem holds the power supply terminal. It is preferable that the wiring board is configured to hold the power supply terminal with a large force.
- the force with which the wiring board holds the power supply terminal is larger than the force with which the stem holds the power supply terminal.
- the power supply terminal loses the power of the laser body.
- the power supply to the semiconductor laser becomes impossible, and it is possible to prevent a malicious person from removing the high-power laser light source and diverting it to other uses.
- the projection-type display device when driving the laser light source, can ensure high safety for the eyes together with the reflective avoidance operation when the eyes look at the laser beam.
- the laser light source when the laser light source is not driven, it is useful as a projection display device that can prevent a malicious person from removing the high-power laser light source and diverting it to other uses.
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- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Projection Apparatus (AREA)
- Transforming Electric Information Into Light Information (AREA)
- Semiconductor Lasers (AREA)
- Liquid Crystal (AREA)
- Video Image Reproduction Devices For Color Tv Systems (AREA)
Abstract
Description
Claims
Priority Applications (3)
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US12/064,784 US7967452B2 (en) | 2005-08-26 | 2006-08-24 | Projection type display apparatus |
JP2007532182A JP4970269B2 (ja) | 2005-08-26 | 2006-08-24 | 投写型ディスプレイ装置 |
CN2006800304513A CN101243357B (zh) | 2005-08-26 | 2006-08-24 | 投影型显示装置 |
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JP2005-245603 | 2005-08-26 | ||
JP2005245603 | 2005-08-26 |
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PCT/JP2006/316643 WO2007023916A1 (ja) | 2005-08-26 | 2006-08-24 | 投写型ディスプレイ装置 |
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US (1) | US7967452B2 (ja) |
JP (4) | JP4970269B2 (ja) |
CN (1) | CN101243357B (ja) |
WO (1) | WO2007023916A1 (ja) |
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Also Published As
Publication number | Publication date |
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JP4970604B2 (ja) | 2012-07-11 |
JP4970269B2 (ja) | 2012-07-04 |
CN101243357B (zh) | 2010-12-22 |
JP4970602B2 (ja) | 2012-07-11 |
US20090262262A1 (en) | 2009-10-22 |
JP2011141562A (ja) | 2011-07-21 |
JPWO2007023916A1 (ja) | 2009-03-26 |
JP4970603B2 (ja) | 2012-07-11 |
CN101243357A (zh) | 2008-08-13 |
JP2011141561A (ja) | 2011-07-21 |
JP2011175268A (ja) | 2011-09-08 |
US7967452B2 (en) | 2011-06-28 |
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