WO2015064154A1 - 表示装置 - Google Patents
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- WO2015064154A1 WO2015064154A1 PCT/JP2014/068466 JP2014068466W WO2015064154A1 WO 2015064154 A1 WO2015064154 A1 WO 2015064154A1 JP 2014068466 W JP2014068466 W JP 2014068466W WO 2015064154 A1 WO2015064154 A1 WO 2015064154A1
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- Prior art keywords
- light
- temperature
- optical filter
- light source
- display device
- Prior art date
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- 230000003287 optical effect Effects 0.000 claims abstract description 151
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Classifications
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- 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]
- H04N9/3191—Testing thereof
- H04N9/3194—Testing thereof including sensor feedback
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- G—PHYSICS
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- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/01—Head-up displays
- G02B27/0101—Head-up displays characterised by optical features
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J1/00—Photometry, e.g. photographic exposure meter
- G01J1/42—Photometry, e.g. photographic exposure meter using electric radiation detectors
- G01J1/4204—Photometry, e.g. photographic exposure meter using electric radiation detectors with determination of ambient light
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/10—Beam splitting or combining systems
- G02B27/1006—Beam splitting or combining systems for splitting or combining different wavelengths
- G02B27/102—Beam splitting or combining systems for splitting or combining different wavelengths for generating a colour image from monochromatic image signal sources
- G02B27/104—Beam splitting or combining systems for splitting or combining different wavelengths for generating a colour image from monochromatic image signal sources for use with scanning systems
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- G—PHYSICS
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- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/10—Beam splitting or combining systems
- G02B27/14—Beam splitting or combining systems operating by reflection only
- G02B27/141—Beam splitting or combining systems operating by reflection only using dichroic mirrors
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/0147—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on thermo-optic effects
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S5/00—Semiconductor lasers
- H01S5/10—Construction or shape of the optical resonator, e.g. extended or external cavity, coupled cavities, bent-guide, varying width, thickness or composition of the active region
- H01S5/18—Surface-emitting [SE] lasers, e.g. having both horizontal and vertical cavities
- H01S5/183—Surface-emitting [SE] lasers, e.g. having both horizontal and vertical cavities having only vertical cavities, e.g. vertical cavity surface-emitting lasers [VCSEL]
- H01S5/18361—Structure of the reflectors, e.g. hybrid mirrors
- H01S5/18363—Structure of the reflectors, e.g. hybrid mirrors comprising air layers
- H01S5/18366—Membrane DBR, i.e. a movable DBR on top of the VCSEL
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- H—ELECTRICITY
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- 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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- H04N9/3141—Constructional details thereof
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- G02B27/01—Head-up displays
- G02B27/0101—Head-up displays characterised by optical features
- G02B2027/0112—Head-up displays characterised by optical features comprising device for genereting colour display
- G02B2027/0114—Head-up displays characterised by optical features comprising device for genereting colour display comprising dichroic elements
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- G02B27/0101—Head-up displays characterised by optical features
- G02B2027/0118—Head-up displays characterised by optical features comprising devices for improving the contrast of the display / brillance control visibility
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- G02B27/0101—Head-up displays characterised by optical features
- G02B2027/013—Head-up displays characterised by optical features comprising a combiner of particular shape, e.g. curvature
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- G02B27/0101—Head-up displays characterised by optical features
- G02B2027/014—Head-up displays characterised by optical features comprising information/image processing 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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- 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
- H04N9/3158—Modulator illumination systems for controlling the spectrum
Definitions
- the present invention relates to a display device.
- a display device such as a head-up display or a head-mounted display that projects an image for projection on a display disposed in front of the user's field of view and displays the image superimposed on the background
- a technique related to such a display device for example, there is a head-up display described in Patent Document 1.
- a sensor for measuring the ambient light is arranged in the vicinity of the display. The output of the light source used for displaying the projection image (the brightness of the projection image displayed on the display) is adjusted according to the detection result of the sensor.
- the visibility of the projection image displayed on the display is ensured by adjusting the output of the light source.
- the relationship between drive current and output may not be linear in the vicinity of a threshold current (minimum current capable of laser oscillation).
- a threshold current minimum current capable of laser oscillation
- the adjustable range becomes narrow.
- a scanning projection type display device that scans light from a light source on the display Then, it is necessary to separately examine a means for adjusting the amount of light directed to the display.
- the present invention has been made to solve the above-described problems, and can accurately adjust the amount of light directed to the display in accordance with the brightness of the ambient light, and can ensure good visibility of the projection image displayed on the display.
- An object is to provide a display device.
- a display device includes a light source that outputs light, an optical scanning unit that scans output light from the light source, and an optical filter that is disposed on the optical path of the output light.
- An optical scanning device including: a display on which output light scanned by the optical scanning device is projected in a superimposed manner; a temperature of the optical scanning device is controlled, and an amount of output light directed from the optical filter to the display is determined.
- a temperature control unit for controlling.
- the amount of output light directed from the optical filter to the display is controlled by controlling the temperature of the optical scanning device. This makes it possible to adjust the amount of light going to the display in accordance with the brightness of the ambient light, and to improve the visibility of the projection image displayed on the display, even for a scanning projection type display device whose brightness cannot be adjusted by the display itself. Can be secured.
- the amount of light is adjusted using temperature instead of adjusting the power supply voltage of the light source, it is possible to accurately adjust the amount of light output to the display by appropriately designing the characteristics of the optical filter. Become.
- the light source is a light source whose wavelength of output light has temperature dependence
- the temperature control unit may control the temperature of the light source. In this case, it is possible to accurately adjust the amount of output light directed to the display by designing characteristics such as transmittance and reflectance of the optical filter.
- the optical filter is a filter whose band characteristic has temperature dependence
- the temperature control unit may control the temperature of the optical filter.
- the amount of output light directed to the display can be accurately adjusted by designing the thermal expansion coefficient of the material constituting the optical filter.
- an environmental light detection sensor for detecting the amount of ambient light may be further provided, and the temperature control unit may control the temperature of the optical scanning device based on the amount of ambient light detected by the ambient light detection sensor. In this case, based on the detection result of the ambient light detection sensor, it is possible to adjust the amount of output light directed to the display more accurately.
- the optical filter may be disposed between the light source and the optical scanning unit. Since the optical filter may have angle dependency, it is conceivable that the characteristic of the optical filter varies due to scanning if it is arranged on the rear side of the optical scanning unit. Therefore, by arranging the optical filter between the light source and the optical scanning unit, the amount of output light directed to the display can be accurately adjusted.
- the optical filter may be provided separately from other optical elements that form the optical path of the output light.
- the angle of the optical filter can be adjusted separately from the other optical elements. Therefore, for example, even if the characteristics of the optical filter vary from lot to lot, it is easy to adjust to the desired characteristics by adjusting the angle of the optical filter while maintaining the optical path of the output light.
- the light source may include a plurality of light sources having different wavelengths of output light, and further include a light combining unit that combines the output lights from the plurality of light sources.
- a color projection image can be displayed on the display.
- the optical filter may be arranged on the downstream side of the optical path with respect to the light combining unit. In this case, since the light quantity of each output light can be adjusted with a single optical filter, the configuration of the apparatus can be simplified.
- each optical filter may be disposed between each light source and the light combining unit.
- each optical filter can be easily designed by producing an optical filter corresponding to the wavelength of each light source.
- a temperature detection sensor for detecting the temperature of the optical scanning device may be further provided. Thereby, the light quantity of the output light which goes to a display from an optical filter can be adjusted still more accurately.
- a light amount detection sensor for detecting the light amount of the output light directed from the optical filter to the display may be further provided. Thereby, the light quantity of the output light which goes to a display from an optical filter can be adjusted still more accurately.
- the output of the light source can be adjusted with high accuracy according to the brightness of the ambient light, and the visibility of the projection image displayed on the display can be ensured satisfactorily.
- FIG. 1 is a diagram showing an embodiment of a display device according to the present invention.
- the display device 1 includes, for example, an optical scanning device 2, an image plane diffusion screen 3, a reflection mirror 4, and a combiner (display) 5.
- the display device 1 is configured as an in-vehicle head-up display, for example.
- the primary image by the laser light (output light) L modulated by the projection signal in the optical scanning device 2 is projected onto the combiner 5 through the image plane diffusion screen 3 and the reflection mirror 4.
- the combiner 5 is a windshield of a vehicle, for example, and is visually recognized by the user in a state where a projection image displayed by the laser light L modulated by the projection signal is superimposed on the background.
- the optical scanning device 2 has, for example, a video signal processing unit 11, a light source driving unit 12, a light source 13, a condenser lens 14, and a dichroic mirror (photosynthesis) as a configuration for scanning the combiner 5 with the laser light L. Section) 15, a half mirror 16, and a signal scanning drive mirror (optical scanning section) 17.
- the video signal processing unit 11 is a part that generates a projection signal.
- the light source driving unit 12 is a part that controls output, modulation, and the like of the light source 13.
- the projection signal generated by the video signal processing unit 11 is output to the light source driving unit 12, and the laser light L modulated by the projection signal is output from the light source 13.
- the light source 13 includes a plurality of light source units 13a (red), 13b (green), and 13c (blue) that emit laser light L corresponding to wavelengths of RGB colors.
- the light source 13 for example, an LD (laser diode), a VCSEL (vertical cavity surface emitting laser), an SLD (super luminescent diode), an LED (light emitting diode), or the like is used.
- the condenser lens 14 is disposed on the upstream side of the light sources 13a, 13b, and 13c, and the dichroic mirror 15 is disposed on the upstream side of each condenser lens 14, respectively.
- the laser beams L emitted from the light sources 13a, 13b, and 13c are combined by the dichroic mirror 15 through the condenser lens 14, reflected by the half mirror 16, and guided to the signal scanning drive mirror 17.
- the signal scanning drive mirror 17 is an electromagnetically driven optical mirror manufactured using, for example, MEMS (Micro Electro Mechanical Systems) technology.
- the signal scanning drive mirror 17 can swing at a predetermined frequency based on a control signal from a drive control unit (not shown).
- a drive control unit not shown.
- an optical filter 21, a temperature control element 22, and an ambient light detection sensor are used as a configuration for adjusting the light amount of the projection image according to the ambient light amount. 23 and a temperature control unit 24.
- the optical filter 21 is, for example, a light blocking filter that blocks light in a predetermined wavelength band.
- the optical filter 21 is disposed between the dichroic mirror 15 and the half mirror 16 in the optical path of the laser light L.
- the temperature control element 22 is, for example, a Peltier element.
- the temperature control element 22 is disposed with respect to the light source 13 and controls the temperature of the light source 13 based on a control signal from the temperature control unit 24.
- the ambient light detection sensor 23 is a sensor that detects the amount of ambient light around the combiner 5.
- the ambient light detection sensor 23 appropriately outputs the detection result of the ambient light amount to the temperature control unit 24.
- the ambient light detection sensor 23 can be a sensor used for turning on / off a vehicle light.
- the ambient light detection sensor 23 may be arrange
- the temperature control unit 24 is a part that controls the operation of the temperature control element 22.
- the temperature control unit 24 adjusts the temperature of the light source 13 by the temperature control element 22 based on the detection result from the ambient light detection sensor 23.
- FIG. 2 is a diagram illustrating an example of light amount control by the temperature control unit 24 when a light shielding filter is used as the optical filter 21.
- the horizontal axis indicates the wavelength
- the vertical axis indicates the light amount and the attenuation
- the wavelength band Wa of the red laser light by the light source 13a, the wavelength band Wb of the green laser light by the light source 13b, and the light source 13c is plotted.
- the light shielding filter includes a shielding band Ca on the short wavelength side with respect to the wavelength band Wa of the red laser light, a shielding band Cb on the short wavelength side with respect to the wavelength band Wb of the green laser light, and a blue laser.
- Each has a shielding band Cc on the short wavelength side with respect to the wavelength band Wc of light.
- the temperature control unit 24 controls the temperature control element 22 so that the temperature of the light source 13 shifts to the high temperature side as the amount of ambient light detected by the ambient light detection sensor 23 increases.
- the wavelength bands Wa, Wb, Wc are separated from the shielding bands Ca, Cb, Cc, respectively, and the amount of laser light L directed from the optical filter 21 toward the combiner 5 can be increased.
- the temperature control unit 24 controls the temperature control element 22 so that the temperature of the light source 13 shifts to a low temperature side as the amount of the ambient light detected by the ambient light detection sensor 23 decreases.
- the wavelength bands Wa, Wb, and Wc approach the shield bands Ca, Cb, and Cc, respectively, and the amount of laser light L that travels from the optical filter 21 toward the combiner 5 can be reduced.
- the shielding bands Ca, Cb, Cc of the optical filter 21 are set on the short wavelength side of the wavelength bands Wa, Wb, Wc. For example, during the daytime when the amount of ambient light is large, the temperature around the display device 1 may be high. Further, at night when the amount of ambient light is small, the temperature around the display device 1 may be low.
- the temperature of the light source 13 when the temperature around the display device 1 is high, the temperature of the light source 13 is shifted to the high temperature side, and when the temperature around the display device 1 is low, the temperature of the light source 13 is shifted to the low temperature side. It becomes possible to suppress power consumption when the temperature control element 22 is controlled by the control unit 24.
- FIG. 3 is a diagram showing a modification of the light amount control by the temperature control unit 24 when a light shielding filter is used as the optical filter 21.
- the light shielding filter includes a shielding band Ca that is longer than the wavelength band Wa of the red laser light, a shielding band Cb that is longer than the wavelength band Wb of the green laser light, And a shielding band Cc on the longer wavelength side with respect to the wavelength band Wc of the blue laser light.
- the temperature control unit 24 controls the temperature control element 22 so that the temperature of the light source 13 shifts to a low temperature side as the amount of ambient light detected by the ambient light detection sensor 23 increases.
- the wavelength bands Wa, Wb, Wc are separated from the shielding bands Ca, Cb, Cc, respectively, and the amount of laser light L directed from the optical filter 21 toward the combiner 5 can be increased.
- the temperature control unit 24 controls the temperature control element 22 so that the temperature of the light source 13 is shifted to a higher temperature side as the amount of the ambient light detected by the ambient light detection sensor 23 becomes smaller.
- the wavelength bands Wa, Wb, and Wc approach the shield bands Ca, Cb, and Cc, respectively, and the amount of laser light L that travels from the optical filter 21 toward the combiner 5 can be reduced.
- the shielding bands Ca, Cb, Cc of the optical filter 21 are set on the long wavelength side of the wavelength bands Wa, Wb, Wc.
- the temperature around the display device 1 when the temperature around the display device 1 is high, the temperature of the light source 13 is shifted to the low temperature side, and when the temperature around the display device 1 is low, the temperature of the light source 13 is shifted to the high temperature side. It is possible to prevent the temperature of 13 from rising or falling excessively. Further, it is possible to prevent the wavelength of the light source 13 from being excessively shifted to the long wavelength side or the short wavelength side, and to suppress the color change of the projection image.
- FIG. 4 is a diagram showing a modification of the light amount control by the temperature control unit 24 when a light reflection filter is used as the optical filter 21.
- the horizontal axis indicates the wavelength
- the vertical axis indicates the amount of light and the amount of reflection
- the light reflection filter has a reflection band Ra that is longer than the wavelength band Wa of the red laser light, a green laser. It has a reflection band Rb that is longer than the wavelength band Wb of light and a reflection band Rc that is longer than the wavelength band Wc of blue laser light.
- the temperature control unit 24 controls the temperature control element 22 so that the temperature of the light source 13 shifts to the high temperature side as the amount of ambient light detected by the ambient light detection sensor 23 increases.
- the wavelength bands Wa, Wb, and Wc approach the reflection bands Ra, Rb, and Rc, respectively, and the amount of laser light L that is reflected by the optical filter 21 and travels toward the combiner 5 can be increased.
- the temperature control unit 24 controls the temperature control element 22 so that the temperature of the light source 13 shifts to a low temperature side as the amount of the ambient light detected by the ambient light detection sensor 23 decreases. Accordingly, the wavelength bands Wa, Wb, and Wc are separated from the reflection bands Ra, Rb, and Rc, respectively, and the amount of laser light L that is reflected by the optical filter 21 and travels toward the combiner 5 can be reduced.
- the brightness of the projection image on the combiner 5 increases when the amount of ambient light is large, and the brightness of the projection image on the combiner 5 decreases when the amount of ambient light is small. Therefore, the visibility of the projection image can be ensured satisfactorily.
- the temperature of the light source 13 is shifted to the high temperature side when the temperature around the display device 1 is high, and the temperature of the light source 13 is changed to the low temperature side when the temperature around the display device 1 is low. Therefore, it is possible to suppress power consumption when the temperature control unit 24 controls the temperature control element 22.
- Light reflection filters each having a reflection band Rc on the short wavelength side with respect to the band Wc may be used.
- the temperature control unit 24 controls the temperature control element 22 so that the temperature of the light source 13 shifts to a low temperature side as the amount of ambient light detected by the ambient light detection sensor 23 increases.
- the wavelength bands Wa, Wb, and Wc are close to the reflection bands Ra, Rb, and Rc, respectively, and the amount of laser light L that is reflected by the optical filter 21 and travels toward the combiner 5 can be increased.
- the temperature control unit 24 controls the temperature control element 22 so that the temperature of the light source 13 is shifted to a higher temperature side as the amount of the ambient light detected by the ambient light detection sensor 23 becomes smaller. Accordingly, the wavelength bands Wa, Wb, and Wc are separated from the reflection bands Ra, Rb, and Rc, respectively, and the amount of laser light L that is reflected by the optical filter 21 and travels toward the combiner 5 can be reduced.
- the brightness of the projection image on the combiner 5 increases when the amount of ambient light is large, and the brightness of the projection image on the combiner 5 decreases when the amount of ambient light is small. Therefore, the visibility of the projection image can be ensured satisfactorily.
- the temperature of the light source 13 is shifted to the low temperature side when the temperature around the display device 1 is high, and the temperature of the light source 13 is changed to the high temperature side when the temperature around the display device 1 is low. Therefore, it is possible to prevent the temperature of the light source 13 from excessively rising or falling. Further, it is possible to prevent the wavelength of the light source 13 from being excessively shifted to the long wavelength side or the short wavelength side, and to suppress the color change of the projection image.
- the temperature control unit 24 may include a temperature detection sensor 25 that detects the temperature of the light source 13 and a light amount detection sensor 26 that detects the amount of laser light L directed from the optical filter 21 toward the combiner 5.
- the temperature detection sensor is disposed, for example, in the vicinity of the light source 13 and detects the temperature of the light source 13.
- the light amount detection sensor 26 is disposed on the rear side of the half mirror 16 and detects the light amount of one of the laser beams L branched by the half mirror 16 (one that does not face the signal scanning drive mirror).
- the temperature control unit 24 controls the temperature control element 22 by feeding back to the temperature control unit 24 the detection result of the temperature of the light source 13 by the temperature detection sensor 25 and the detection result of the light quantity of the laser light L by the light quantity detection sensor 26. Can be executed with higher accuracy, and the amount of laser light L directed from the optical filter 21 to the combiner 5 can be adjusted with higher accuracy.
- the change of the wavelength of LD by a temperature change is comparatively as small as about 0.6 nm / degreeC. Further, it is considered that the life of the LD is affected at a high temperature state, and an excessive change in wavelength may impair the color reproducibility of the projection image. For this reason, it is preferable that the shielding bands Ca, Cb, Cc or the reflection bands Ra, Rb, Rc of the optical filter 21 have a steep slope, particularly on the wavelength bands Wa, Wb, Wc side. For example, the attenuation curve of the optical filter 21 has an inclination that the amount of the laser light L is reduced by 10% when the wavelength of the laser light L is shifted by about 20 nm to the shielding band side.
- the wavelength shift of 20 nm corresponds to a temperature change of about 30 ° C. when the wavelength change characteristic of the light source 13 is 0.6 nm / ° C. Therefore, for example, the light quantity of the laser light L can be adjusted by changing the temperature of the light source 13 in the range of 15 ° C. to 45 ° C.
- the shielding bands Ca, Cb, Cc or the reflection bands Ra, Rb, Rc of the optical filter 21 are narrow bands similar to the wavelength bands Wa, Wb, Wc.
- the shielding bands Ca, Cb, and Cc of the optical filter 21 may have a wider band than the wavelength bands Wa, Wb, and Wc.
- the optical filter 21 is disposed on the rear stage side of the light sources 13a, 13b, and 13c (for example, between the condenser lens 14 and the dichroic mirror 15), as shown in FIG.
- the shielding band C or the reflection band R in consideration of only the wavelength band W.
- the shielding bands Ca, Cb, Cc or the reflection bands Ra, Rb, Rc of the optical filter 21 have a steep slope at least on the wavelength bands Wa, Wb, Wc side. preferable.
- the optical filter 21 when the optical filter 21 is arranged on the rear side of the dichroic mirror 15, the light quantity of each output light can be adjusted by the single optical filter 21, so that the apparatus configuration can be simplified. Figured. Further, when the optical filters 21 are respectively disposed between the light source 13 and the dichroic mirror 15, the optical filters 21 corresponding to the wavelengths of the light sources 13 are respectively produced, whereby the design of each optical filter 21 is easy. It becomes.
- the characteristics (shielding band / reflection band) of the optical filter 21 may vary slightly depending on the lot.
- the influence of the variation in the characteristics of the optical filter 21 can be eliminated by adjusting the temperature of the light source 13, but if the variation in the characteristics is large, the load on the light source 13 is increased and the temperature control element An increase in power consumption required for the control 22 is a problem.
- the display device 1 is separate from other optical elements that form the optical path of the laser light L (here, the dichroic mirror 15, the half mirror 16, and the signal scanning drive mirror 17).
- the angle of the optical filter 21 with respect to the optical axis of the laser beam L can be adjusted separately from other optical elements. Therefore, for example, even if the characteristics of the optical filter 21 vary from lot to lot, it is easy to adjust to the desired characteristics by adjusting the angle of the optical filter 21 while maintaining the optical path of the laser light L.
- the optical filter 21 needs to be arranged between the light source 13 and the signal scanning drive mirror 17 in consideration of the above-described angle dependency. If the optical filter 21 is disposed on the rear stage side of the signal scanning drive mirror 17, it is conceivable that the characteristics of the optical filter 21 change due to scanning. Therefore, by arranging the optical filter 21 between the light source 13 and the signal scanning drive mirror 17, it is possible to accurately adjust the light amount of the laser light L toward the combiner 5.
- the optical filter 21 is disposed between the dichroic mirror 15 and the half mirror 16, but between the light source 13 and the dichroic mirror 15 and between the half mirror 16 and the signal scanning drive mirror 17.
- An optical filter 21 may be disposed on the surface.
- the optical system shown in FIG. 1 cannot detect the light amount of the laser light L by the light amount detection sensor 26. It is not always necessary to use a half mirror.
- the light amount of the laser light L from the optical filter 21 toward the combiner 5 is controlled by controlling the temperature of the light source 13 by using the wavelength temperature dependency of the light source 13. Yes.
- the light quantity which goes to the combiner 5 can be adjusted according to the brightness and darkness of environmental light, and the image for projection displayed on the combiner 5 can be adjusted. Good visibility can be secured.
- the light amount is adjusted using the wavelength temperature dependency of the light source 13, not the power supply voltage of the light source 13, and thus characteristics such as transmittance and reflectance of the optical filter 21 are appropriately designed. By doing so, it becomes possible to adjust the light quantity of the laser beam L toward the combiner 5 with high accuracy.
- the present invention is not limited to the above embodiment.
- the display device 1 is exemplified as being applied to a vehicle-mounted head-up display.
- the display device according to the present invention can also be applied to, for example, a glasses-type head-mounted display. .
- FIG. 7 is a diagram showing a modification of the display device according to the present invention.
- an optical filter 41 whose band characteristic has temperature dependence is used in the optical scanning device 32, and the temperature control element 42 is included in the optical filter 41. Is attached.
- the temperature of the optical filter 41 is controlled by the temperature control element 42 to shift the characteristics (shielding band / reflection band) of the optical filter 41 to the long wavelength side or the short wavelength side.
- the amount of laser light L directed from 41 to the combiner 5 is controlled.
- the temperature detection sensor 45 be disposed in the vicinity of the optical filter 41 to detect the temperature of the optical filter 41 and output it to the temperature control unit 24.
- the optical filter 41 whose band characteristic has temperature dependence
- a polymer wavelength filter formed of a polymer resin material can be used.
- the band characteristics can be changed depending on the temperature in accordance with the linear expansion coefficient of the material.
- FIG. 8 is a diagram showing an example of a form of attachment of the temperature control element 42 to the optical filter 41.
- a support member 43 formed of a member (glass or the like) having transparency to the laser beam L is used as the optical filter.
- the temperature control element 22 may be fixed to a surface of the support member 43 opposite to the optical filter 41.
- a support member 43 having an outer shape larger than the outer shape of the optical filter 41 is used so that a part of the support member 43 protrudes from the outer edge of the optical filter 41, and the temperature control element 42 is provided at the protruding portion of the support member 43. Is preferably fixed.
- the temperature control element 42 may be directly fixed to one surface of the optical filter 41 without using the support member 43. In this case, it is preferable to shift the temperature control element 42 from the center of the optical filter 41 so that the edge of the optical filter 41 and the edge of the temperature control element 42 coincide.
- an annular temperature control element 44 is used, and the temperature control element is provided on one surface of the optical filter 41 so that the optical filter 41 and the temperature control element 44 are coaxial. 44 may be fixed.
- a heating wire 46 made of a high thermal conductivity material may be used as the temperature control element.
- the heating wire 46 may be fixed to one surface of the optical filter 41, and the end of the heating wire 46 may be drawn out of the optical filter 41 and connected to the temperature control unit 24.
- the heating wire 46 is not limited to a linear one, and may have another shape such as a strip shape or a foil shape.
- the wavelength of a light source with temperature it is preferable that the characteristic by the side of an optical filter does not have temperature dependence.
- the band on the optical filter side with temperature it is preferable to make the wavelength of the light source constant.
- the light source having a constant wavelength DFB-LD, external wavelength using a grating, etc.
- a stabilizing laser it is preferable to use a stabilizing laser, a light source having a separate temperature control means, or the like.
- the light quantity of the laser light L may be adjusted by controlling the temperature of both the light source and the optical filter.
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Abstract
Description
Claims (11)
- 光を出力する光源と、前記光源からの出力光を走査する光走査部と、前記出力光の光路上に配置された光学的フィルタとを含む光走査装置と、
前記光走査装置によって走査された前記出力光が背景と重畳して投影されるディスプレイと、
前記光走査装置の温度を制御し、前記光学的フィルタから前記ディスプレイに向かう前記出力光の光量を制御する温度制御部と、を備えた表示装置。 - 前記光源は、前記出力光の波長が温度依存性を有する光源であり、
前記温度制御部は、前記光源の温度を制御する請求項1記載の表示装置。 - 前記光学的フィルタは、帯域特性が温度依存性を有するフィルタであり、
前記温度制御部は、前記光学的フィルタの温度を制御する請求項1記載の表示装置。 - 環境光の光量を検出する環境光検出センサを更に備え、
前記温度制御部は、前記環境光検出センサによって検出された前記環境光の光量に基づいて前記光走査装置の温度を制御する請求項1~3のいずれか一項記載の表示装置。 - 前記光学的フィルタは、前記光源から前記光走査部までの間に配置されている請求項1~4のいずれか一項記載の表示装置。
- 前記光学的フィルタは、前記出力光の光路を形成する他の光学素子とは別体に設けられている請求項1~5のいずれか一項記載の表示装置。
- 前記光源は、出力光の波長が互いに異なる複数の光源からなり、
前記複数の光源からの前記各出力光を合成する光合成部を更に備えた請求項1~6のいずれか一項記載の表示装置。 - 前記光学的フィルタは、前記光合成部よりも前記光路の後段側に配置されている請求項7記載の表示装置。
- 前記光学的フィルタは、前記各光源から前記光合成部までの間にそれぞれ配置されている請求項7記載の表示装置。
- 前記光走査装置の温度を検出する温度検出センサを更に備えた請求項1~9のいずれか一項記載の表示装置。
- 前記光学的フィルタから前記ディスプレイに向かう前記出力光の光量を検出する光量検出センサを更に備えた請求項1~10のいずれか一項記載の表示装置。
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EP14859282.7A EP3064984B1 (en) | 2013-10-29 | 2014-07-10 | Display device |
US15/032,342 US9769445B2 (en) | 2013-10-29 | 2014-07-10 | Display device |
CN201480059032.7A CN105683811B (zh) | 2013-10-29 | 2014-07-10 | 显示装置 |
KR1020167012616A KR102268967B1 (ko) | 2013-10-29 | 2014-07-10 | 표시 장치 |
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JP2013224174A JP6285145B2 (ja) | 2013-10-29 | 2013-10-29 | 表示装置 |
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EP (1) | EP3064984B1 (ja) |
JP (1) | JP6285145B2 (ja) |
KR (1) | KR102268967B1 (ja) |
CN (1) | CN105683811B (ja) |
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Families Citing this family (15)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP6561606B2 (ja) * | 2015-06-12 | 2019-08-21 | セイコーエプソン株式会社 | 表示装置、及び、表示装置の制御方法 |
JP6643495B2 (ja) * | 2016-01-25 | 2020-02-12 | ショット グラス テクノロジーズ (スゾウ) カンパニー リミテッドSchott Glass Technologies (Suzhou) Co., Ltd. | 光学的パラメータ検出システム |
JP6791644B2 (ja) * | 2016-03-24 | 2020-11-25 | 株式会社小糸製作所 | 車両用前照灯 |
CN107290916A (zh) * | 2016-04-01 | 2017-10-24 | 英济股份有限公司 | 激光调光系统 |
CN107290917A (zh) * | 2016-04-01 | 2017-10-24 | 英济股份有限公司 | 激光调光系统 |
CN106406003A (zh) * | 2016-11-18 | 2017-02-15 | 深圳市华星光电技术有限公司 | 投影光机及激光投影装置 |
JP7264063B2 (ja) * | 2017-12-04 | 2023-04-25 | ソニーグループ株式会社 | 画像表示装置 |
CN108073379B (zh) * | 2017-12-29 | 2020-09-15 | 浙江万里学院 | 基于移动终端的智能物流监控方法 |
US10168537B1 (en) * | 2018-03-16 | 2019-01-01 | Facebook Technologies, Llc | Single chip superluminous light emitting diode array for waveguide displays |
WO2019181746A1 (en) * | 2018-03-19 | 2019-09-26 | Ricoh Company, Ltd. | Image display device, image projection device, and moving body |
JP2019164180A (ja) * | 2018-03-19 | 2019-09-26 | 株式会社リコー | 光走査装置、画像表示装置、ヘッドアップディスプレイ、及び移動体 |
US10809558B2 (en) * | 2018-05-11 | 2020-10-20 | Yazaki Corporation | Vehicle display device |
JP7208463B2 (ja) * | 2018-05-15 | 2023-01-19 | ミツミ電機株式会社 | 制御装置、光走査装置、表示装置及び制御方法 |
DE202018106156U1 (de) | 2018-10-26 | 2018-11-08 | E-Lead Electronic Co., Ltd. | Eingebettetes Head-up-Displaygerät |
CN113889053B (zh) * | 2021-06-04 | 2022-07-22 | 荣耀终端有限公司 | 基于环境光传感器的屏幕亮度调整方法 |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0470775A (ja) * | 1990-07-11 | 1992-03-05 | Canon Inc | 画像形成装置 |
JPH078624B2 (ja) | 1989-08-31 | 1995-02-01 | 株式会社島津製作所 | ヘッドアップディスプレイ |
JP2012032721A (ja) * | 2010-08-02 | 2012-02-16 | Nippon Seiki Co Ltd | 表示装置 |
JP2012078619A (ja) * | 2010-10-04 | 2012-04-19 | Panasonic Corp | 透過型表示装置 |
Family Cites Families (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2002277816A (ja) | 2001-03-21 | 2002-09-25 | Minolta Co Ltd | 映像表示装置 |
US6822742B1 (en) * | 2003-12-19 | 2004-11-23 | Eastman Kodak Company | System and method for remote quantitative detection of fluid leaks from a natural gas or oil pipeline |
JP2009047969A (ja) * | 2007-08-21 | 2009-03-05 | Seiko Epson Corp | プロジェクタおよび表示装置 |
JPWO2009122716A1 (ja) * | 2008-04-03 | 2011-07-28 | パナソニック株式会社 | 情報表示装置 |
JP2010237238A (ja) * | 2009-03-30 | 2010-10-21 | Nippon Seiki Co Ltd | 表示装置 |
US20100253595A1 (en) | 2009-04-02 | 2010-10-07 | Gm Global Technology Operations, Inc. | Virtual controls and displays by laser projection |
WO2011132407A1 (ja) * | 2010-04-20 | 2011-10-27 | パナソニック株式会社 | 画像表示装置 |
US8294993B2 (en) | 2010-07-26 | 2012-10-23 | Microvision, Inc. | Variable reflectivity notch filter and optical devices using same |
WO2012042744A1 (ja) | 2010-10-01 | 2012-04-05 | パナソニック株式会社 | 表示装置、移動体及び制御装置 |
JP5811604B2 (ja) | 2011-06-08 | 2015-11-11 | セイコーエプソン株式会社 | 表示装置 |
JP5842419B2 (ja) * | 2011-07-06 | 2016-01-13 | 日本精機株式会社 | ヘッドアップディスプレイ装置 |
JP5299485B2 (ja) * | 2011-09-05 | 2013-09-25 | セイコーエプソン株式会社 | 光源装置、画像表示装置及びモニタ装置 |
-
2013
- 2013-10-29 JP JP2013224174A patent/JP6285145B2/ja active Active
-
2014
- 2014-07-10 WO PCT/JP2014/068466 patent/WO2015064154A1/ja active Application Filing
- 2014-07-10 KR KR1020167012616A patent/KR102268967B1/ko active IP Right Grant
- 2014-07-10 CN CN201480059032.7A patent/CN105683811B/zh active Active
- 2014-07-10 EP EP14859282.7A patent/EP3064984B1/en active Active
- 2014-07-10 US US15/032,342 patent/US9769445B2/en active Active
- 2014-07-17 TW TW103124584A patent/TWI627445B/zh active
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH078624B2 (ja) | 1989-08-31 | 1995-02-01 | 株式会社島津製作所 | ヘッドアップディスプレイ |
JPH0470775A (ja) * | 1990-07-11 | 1992-03-05 | Canon Inc | 画像形成装置 |
JP2012032721A (ja) * | 2010-08-02 | 2012-02-16 | Nippon Seiki Co Ltd | 表示装置 |
JP2012078619A (ja) * | 2010-10-04 | 2012-04-19 | Panasonic Corp | 透過型表示装置 |
Non-Patent Citations (1)
Title |
---|
See also references of EP3064984A4 |
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CN105683811B (zh) | 2018-04-17 |
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KR20160078990A (ko) | 2016-07-05 |
TW201516475A (zh) | 2015-05-01 |
JP6285145B2 (ja) | 2018-02-28 |
EP3064984A4 (en) | 2017-07-12 |
TWI627445B (zh) | 2018-06-21 |
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EP3064984A1 (en) | 2016-09-07 |
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US20160255319A1 (en) | 2016-09-01 |
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