WO2016047464A1 - 照明装置および光源制御方法、ならびに投射型表示装置 - Google Patents
照明装置および光源制御方法、ならびに投射型表示装置 Download PDFInfo
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- WO2016047464A1 WO2016047464A1 PCT/JP2015/075823 JP2015075823W WO2016047464A1 WO 2016047464 A1 WO2016047464 A1 WO 2016047464A1 JP 2015075823 W JP2015075823 W JP 2015075823W WO 2016047464 A1 WO2016047464 A1 WO 2016047464A1
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- 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
- G03B21/2006—Lamp housings characterised by the light source
- G03B21/2033—LED or laser light sources
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B26/00—Optical devices or arrangements for the control of light using movable or deformable optical elements
- G02B26/08—Optical devices or arrangements for the control of light using movable or deformable optical elements for controlling the direction of light
- G02B26/0816—Optical devices or arrangements for the control of light using movable or deformable optical elements for controlling the direction of light by means of one or more reflecting elements
- G02B26/0833—Optical devices or arrangements for the control of light using movable or deformable optical elements for controlling the direction of light by means of one or more reflecting elements the reflecting element being a micromechanical device, e.g. a MEMS mirror, DMD
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- G—PHYSICS
- 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
- G03B21/2006—Lamp housings characterised by the light source
- G03B21/2013—Plural light sources
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- 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
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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
- H04N9/3144—Cooling systems
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N9/00—Details of colour television systems
- H04N9/12—Picture reproducers
- H04N9/31—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]
- H04N9/3141—Constructional details thereof
- H04N9/315—Modulator illumination systems
- H04N9/3155—Modulator illumination systems for controlling the light source
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N9/00—Details of colour television systems
- H04N9/12—Picture reproducers
- H04N9/31—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]
- H04N9/3141—Constructional details thereof
- H04N9/315—Modulator illumination systems
- H04N9/3158—Modulator illumination systems for controlling the spectrum
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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]
- H04N9/3191—Testing thereof
- H04N9/3194—Testing thereof including sensor feedback
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/20—Controlling the colour of the light
- H05B45/22—Controlling the colour of the light using optical feedback
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/20—Controlling the colour of the light
- H05B45/24—Controlling the colour of the light using electrical feedback from LEDs or from LED modules
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B47/00—Circuit arrangements for operating light sources in general, i.e. where the type of light source is not relevant
- H05B47/10—Controlling the light source
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B47/00—Circuit arrangements for operating light sources in general, i.e. where the type of light source is not relevant
- H05B47/10—Controlling the light source
- H05B47/155—Coordinated control of two or more light sources
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
- G02B7/003—Alignment of optical elements
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- 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
- G03B33/00—Colour photography, other than mere exposure or projection of a colour film
- G03B33/10—Simultaneous recording or projection
- G03B33/12—Simultaneous recording or projection using beam-splitting or beam-combining systems, e.g. dichroic mirrors
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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]
- H04N9/3102—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM] using two-dimensional electronic spatial light modulators
Definitions
- the present disclosure relates to an illumination device, a light source control method, and a projection display device that projects an image using light from the illumination device.
- projectors projection display devices
- the projector generates image light by modulating light from a light source with a light valve (spatial modulation element), and displays the image light on a screen for display.
- the image projected from the projector is required to have a constant white balance.
- light sources having different wavelengths for example, red, green, and blue
- the ratio of each light output is kept constant. There is a need.
- a temperature control element such as a Peltier element
- a temperature control element is used to suppress a change in white balance by suppressing a change in the temperature of the laser.
- An element is needed.
- the white balance changes.
- An illumination device includes a plurality of light sources that emit light having different wavelengths, and at least one of the plurality of light sources based on a change in relative visibility due to a wavelength change accompanying a temperature change.
- a correction unit that suppresses a change in white balance by correcting the amount of light emitted from the light source is provided.
- a light source control method includes light emitted from at least one light source among a plurality of light sources each emitting light having a different wavelength based on a change in relative visibility due to a wavelength change accompanying a temperature change. By correcting the amount of light, the change in white balance is suppressed.
- a projection display device includes an illumination unit that generates illumination light, a light valve that modulates illumination light based on video data, and emits the modulated light, and modulation from the light valve
- a projection lens that projects light onto a projection surface, and the illumination unit emits light of different wavelengths, and a plurality of light sources based on a change in relative visibility due to a wavelength change accompanying a temperature change
- a correction unit that suppresses a change in white balance by correcting the amount of light emitted from at least one light source.
- At least one of the plurality of light sources emits based on a change in relative visibility due to a wavelength change accompanying a temperature change. By correcting the amount of light, a change in white balance is suppressed.
- the illumination device or the light source control method or the projection display device According to the illumination device or the light source control method or the projection display device according to an embodiment of the present disclosure, at least one light source among a plurality of light sources based on a change in relative visibility due to a wavelength change accompanying a temperature change. Since the amount of light emitted from is corrected, the change in white balance can be suppressed. Note that the effects described here are not necessarily limited, and may be any of the effects described in the present disclosure.
- FIGS. 1 to 16 1.1 Overall Configuration and Operation of Projection Type Display Device 1.1.1 Overall Configuration Example of Projection Type Display Device 1.1.2 Operation of Projection Type Display Device 1.2 Configuration and Operation of Illumination Unit Control System 2.1 Configuration example of control system of illumination unit 1.2.2 Control operation of illumination unit 1.3 Effect Second embodiment (FIGS. 17 to 25) 2.1 Configuration of control system of illumination unit 2.2 Control operation of illumination unit 2.3 Effects 3.
- FIG. 1 shows an example of the overall configuration of a projection display device (projector) according to the first embodiment of the present disclosure.
- the projection display device includes an illumination unit 1, a light valve 21, a wire grid 27 as a polarization separation element, and a projection lens 24.
- the illumination unit 1 emits the illumination light L1 toward the wire grid 27.
- the illumination unit 1 includes a light source and a plurality of illumination optical members that generate illumination light L1 based on light from the light source and guide the illumination light L1 to the light valve 21.
- the light source may be a plurality of light sources arranged on different optical paths.
- the illumination unit 1 also includes an optical path combining element that combines optical paths of two or more light sources among the plurality of light sources.
- the illumination unit 1 includes a blue laser 11B, a green laser 11G, and a red laser 11R as a plurality of light sources arranged on different optical paths.
- the illumination unit 1 also includes a first coupling lens 12B, a second coupling lens 12G, a third coupling lens 12R, a drive optical element 14, and a mirror 18 as a plurality of illumination optical members.
- the third condenser lens 163 and the fourth condenser lens 164 are provided.
- the blue laser 11B is a laser light source that emits blue light having a wavelength of about 450 nm, for example.
- the green laser 11G is a laser light source that emits green light having a wavelength of about 520 nm, for example.
- the red laser 11R is a laser light source that emits red light having a wavelength of about 640 nm, for example.
- the second coupling lens 12G is a lens (coupled lens) for collimating the green light emitted from the green laser 11G (as parallel light) and coupling it with the first dichroic prism 131.
- the first coupling lens 12B is a lens (coupling lens) for collimating the blue light emitted from the blue laser 11B and coupling it with the first dichroic prism 131.
- the third coupling lens 12R is a lens (coupling lens) for collimating the red light emitted from the red laser 11R and coupling it with the second dichroic prism 132.
- Each of the first dichroic prism 131 and the second dichroic prism 132 is an optical path combining element that combines optical paths of two or more light sources.
- the first dichroic prism 131 selectively transmits the blue light incident through the first coupling lens 12B while selectively transmitting the green light incident through the second coupling lens 12G. It is a reflecting prism.
- the second dichroic prism 132 selectively transmits the blue light and the green light emitted from the first dichroic prism 131, while selectively transmitting the red light incident through the third coupling lens 12R. It is a reflecting prism.
- color synthesis optical path synthesis
- the drive optical element 14 is an optical element for reducing speckle noise and interference fringes in the illumination light L ⁇ b> 1, and is disposed on the optical path between the first condenser lens 161 and the second condenser lens 162. .
- the drive optical element 14 changes the state of the light beam passing therethrough, for example, by microvibration in a direction along the optical axis or in a direction perpendicular to the optical axis, thereby reducing speckle noise and interference fringes in the illumination light L1. It is possible to make it.
- Each of the first fly-eye lens 151 and the second fly-eye lens 152 is an optical member (integrator) in which a plurality of lenses are two-dimensionally arranged on a substrate. Are divided and emitted.
- the first fly-eye lens 151 is disposed on the optical path between the second dichroic prism 132 and the first condenser lens 161.
- the second fly-eye lens 152 is disposed on the optical path between the second condenser lens 162 and the third condenser lens 163.
- the mirror 18 is an element that bends the optical path of the illumination light L1.
- the mirror 18 is disposed on the optical path between the first condenser lens 161 and the drive optical element 14.
- the first condenser lens 161 is a lens that collects the light emitted from the first fly-eye lens 151 and makes it incident on the drive optical element 14 via the mirror 18.
- the second condenser lens 162 is a lens that collects the light emitted from the drive optical element 14 and makes it incident on the second fly-eye lens 152.
- the third condenser lens 163 and the fourth condenser lens 164 are lenses for collecting the emitted light from the second fly-eye lens 152 and emitting it as the illumination light L1 toward the wire grid 27.
- the wire grid 27 is formed, for example, by forming a metal lattice on a glass substrate at a minute interval.
- the wire grid 27 is a polarization separation element that separates incident light into a first polarization component (for example, a P polarization component) and a second polarization component (for example, an S polarization component) and emits them in different directions. .
- the wire grid 27 selectively reflects a specific first polarization component and selectively transmits a specific second polarization component.
- the wire grid 27 reflects most of the P-polarized component included in the incident illumination light L1 and transmits most of the S-polarized component.
- the light valve 21 is a reflective liquid crystal element such as LCOS (Liquid Crystal On Silicon).
- the light valve 21 modulates a first polarization component (for example, P polarization component) included in the illumination light L1 that is incident through the wire grid 27, based on video data.
- the light valve 21 also emits the modulated light via the wire grid 27. From the light valve 21, for example, an S-polarized component whose polarization state is rotated from the incident time is emitted as modulated light.
- the light valve 21 can perform black display by returning the incident P-polarized light component to the wire grid 27 in the same polarization state.
- the projection lens 24 projects the modulated light from the light valve 21 incident through the wire grid 27 onto the projection surface 30A of the screen 30.
- the projection lens 24 is a projection optical system for projecting an image.
- FIG. 1 shows a configuration example using the wire grid 27 as the polarization separation element, a configuration using a prism-shaped polarization beam splitter 23 instead of the wire grid 27 may be used.
- the first fly-eye lens 151 and the second fly-eye lens 152 may be either one.
- the first condenser lens 161 and the second condenser lens 162 are not necessary.
- the third condenser lens 163 and the fourth condenser lens 164 are not necessary.
- the illumination unit 1 In the projection display device, the illumination unit 1 generates illumination light L1.
- the light valve 21 modulates the illumination light L1 based on the video data and emits the modulated light.
- the projection lens 24 projects the modulated light from the light valve 21 onto the projection surface 30A.
- FIG. 2 shows a configuration example of the control system of the illumination unit 1.
- the projection display device includes a main control unit 100, a red light source device 101R, a green light source device 101G, and a blue light source device 101B as a control system of the illumination unit 1.
- Each light source device includes a temperature sensor 102, a light amount sensor 103, a storage unit 104, a current control unit 105, a target light amount setting unit 106, and a temperature correction unit 107.
- the temperature sensor 102 is provided in the vicinity of each of the red laser 11R, the green laser 11G, and the blue laser 11B as a plurality of laser light sources, and detects each temperature.
- the light quantity sensor 103 is provided for each of the red laser 11R, the green laser 11G, and the blue laser 11B, and detects the quantity of light emitted from each laser light source.
- the storage unit 104 stores various parameters for light source control.
- the storage unit 104 stores a light amount of each laser light source at a predetermined white balance as a target light amount value Qa.
- the storage unit 104 also stores a temperature at a predetermined white balance as a reference temperature T0.
- the storage unit 104 also stores the wavelength of each laser light source at the reference temperature T0 as the reference wavelength ⁇ 0.
- the storage unit 104 also stores a maximum current value of the drive current that can be passed by each laser light source as a limited current value Imax.
- the temperature correction unit 107 corrects the amount of light emitted from each laser light source on the basis of the change in relative visibility due to the wavelength change accompanying the temperature change of each laser light source, thereby changing the white balance. It is to suppress.
- the target light amount setting unit 106 sets a target light amount value Qa for the current control unit 105.
- the current control unit 105 controls the drive current of each laser light source.
- the current control unit 105 is driven based on the target light amount value Qa set by the target light amount setting unit 106 and the output value of the light amount sensor 103 so that the light amount of light emitted from each laser light source approaches the target light amount value Qa. Set the current value of the current.
- the main control unit 100 controls each light source device. As will be described later, the main control unit 100 sets the set current value and the target light amount value Qa of at least one laser light source among the plurality of laser light sources so that the drive current of each laser light source does not exceed the limit current value Imax. It will be changed accordingly.
- the main control unit 100 sets the target light amount value Qa stored in the storage unit 104 of each of the red light source device 101R, the green light source device 101G, and the blue light source device 101B in each target light amount setting unit 106.
- the current controller 105 is caused to start laser driving.
- the current control unit 105 always causes the light amount of the laser light source to approach the target light amount value Qa based on the light amount of the laser light source acquired from the light amount sensor 103 and the target light amount value Qa set in the target light amount setting unit 106. Thus, the drive current is controlled.
- FIG. 11 shows the relationship between the temperature of the light source and the amount of output light.
- FIG. 12 shows the relationship between the wavelength and the relative visibility.
- FIG. 13 shows an example of wavelength change of the laser light source due to temperature.
- FIG. 14 shows the relationship between the wavelength and the relative visibility.
- FIG. 15 shows changes in the drive current of the laser light source depending on the temperature.
- FIG. 16 shows an example of a change in wavelength of the laser light source due to temperature.
- the amount of light from the light source changes with temperature.
- the oscillation wavelength of the light source changes with a temperature change.
- the threshold current of the laser light source increases as the temperature increases.
- the brightness (specific visual sensitivity) perceived by human eyes varies depending on the wavelength even with the same amount of light. Therefore, for example, when the temperature of the light source rises, the emission wavelength becomes longer at a constant rate, and the relative visibility changes. In this case, if the ratio of the light quantity is kept constant, the white balance will change when the temperature changes greatly.
- the threshold current of the laser light source increases as the temperature increases.
- the drive current for driving the laser light source must always be equal to or less than the limit current value Imax so as not to destroy the laser light source.
- the operation based on the limited current value Imax described here is performed together with the correction operation of the target light quantity value Qa by the temperature correction unit 107 in consideration of a change in relative visibility with temperature, which will be described later. It is preferable.
- the current control unit 105 is controlled to change the set current value for the specific light source.
- the main controller 100 also changes the target light amount value Qa of each of the plurality of laser light sources.
- the red laser 11R of the red light source device 101R has an initial target light amount value that is equal to or less than the limit current value Imax.
- the storage unit 104 stores a limit current value Imax of the laser light source in advance.
- the main control unit 100 appropriately changes the set current value and the target light amount value Qa so that the drive current of each laser light source does not exceed the limit current value Imax. For example, as shown in FIG. 3, the set current value of the red laser 11R exceeds the limit current value Imax in order to output the initial target light amount value Qa. In this way, when it is determined that the current value to be set by the current control unit 105 exceeds the limit current value Imax, the main control unit 100 determines that the set current value in the red laser 11R that is a specific light source is The current control unit 105 is controlled so as to be changed to a value equal to or less than the limit current value Imax. The main control unit 100 also simultaneously changes the target light amount value Qa of all the light source devices. For example, the target light quantity value Qa of all the light source devices is changed at a constant ratio k ( ⁇ 1).
- FIG. 6 shows an example of a change in light amount due to the above current limiting operation.
- FIG. 7 shows the change in the amount of light shown in FIG. 6 with reference to green.
- the brightness can be as bright as possible while keeping the white balance of the projected image constant. it can.
- the main control unit 100 changes the white balance.
- the current control unit 105 is controlled so as to change the set current value of only a specific light source among the plurality of laser light sources within a period of a predetermined state (white balance change state).
- the main control unit 100 also changes the target light amount value Qa only for a specific light source in a predetermined state.
- the main control unit 100 changes the target light amount values Qa of the plurality of laser light sources so as to approach the white balance before the predetermined state is obtained.
- the target light quantity value Qa of a specific light source may be changed based on the target light quantity value before being changed in a predetermined period.
- the specific light source is the red laser 11R
- the main control unit 100 sets the set current in the red laser 11R that is a specific light source.
- the current control unit 105 is controlled so that the value is changed to a value equal to or less than the limit current value Imax.
- the main control unit 100 also sets only the target light amount value Qa of the red laser 11R while the ratio of the output value of the light amount sensor 103 to the target light amount value Qa is equal to or greater than a certain ratio m ( ⁇ 1). To change. For example, only the target light quantity value Qa of the red laser 11R is changed at a constant ratio p ( ⁇ 1). This state is called a white balance change state.
- the main control unit 100 When the ratio is less than a certain ratio m ( ⁇ 1) and the white balance is changed, the main control unit 100 simultaneously changes the target light quantity values Qa of all the light source devices. For example, the target light quantity value Qa of all the laser light sources is changed at a constant ratio k ( ⁇ 1). However, the red light source device 101R does not include the amount changed by the ratio p ( ⁇ 1) during the white balance change state. That is, when the ratio becomes less than a certain ratio m ( ⁇ 1), the main control unit 100 sets a target light amount value of a light source (here, the green laser 11G and the blue laser 11B) other than a specific light source among a plurality of laser light sources. Change at a constant ratio k ( ⁇ 1). In addition, the main control unit 100 changes the target light amount value of the specific light source with the ratio k with respect to the value before changing with the ratio p.
- a target light amount value of a light source here, the green laser 11G and the blue laser 11B
- FIG. 8 shows an example of a change in light amount due to the above current limiting operation.
- FIG. 9 shows the change in the amount of light shown in FIG. 8 with reference to green.
- the change in white balance is within a predetermined range, a decrease in the brightness of the projected image can be suppressed.
- the values of the ratio k, the ratio m, and the ratio p may be appropriately changed by the main control unit 100. These ratios may be set to different values for each light source device.
- the temperature correction unit 107 uses the output value of the temperature sensor 102, the reference temperature T0 and the reference wavelength ⁇ 0 stored in the storage unit 104, and the wavelength of each light emitted by a plurality of laser light sources. Find ⁇ . The temperature correction unit 107 corrects the target light amount value Qa for each of the plurality of laser light sources based on the relative visibility at each light wavelength and the relative visibility at the reference wavelength ⁇ 0.
- the red light source device 101R will be described as an example, but it is common to all light source devices.
- the temperature correction unit 107 detects the temperature T of the laser light source acquired from the temperature sensor 102, the reference temperature T 0 and the reference temperature stored in the storage unit 104.
- the temperature correction unit 107 stores a relationship between the wavelength near the wavelength of the laser light source used in advance and the relative luminous sensitivity as a table, and the ratio of the relative luminous sensitivity at the obtained laser wavelength to the relative luminous sensitivity at the reference wavelength. Thus, the target light quantity value Qa set in the target light quantity setting unit 106 is corrected.
- FIG. 10 shows a light amount change immediately after the start of lighting of the laser light source as an example when the temperature rapidly increases when the correction of the target light amount value Qa by the temperature correction unit 107 described above is enabled.
- the increase in the amount of light of the red laser 11R is remarkable, but this is due to the relatively large correction amount of the red laser 11R. That is, with respect to the red laser 11R, as can be seen from FIGS. 12 to 14, the wavelength becomes longer and the relative visibility tends to decrease as the temperature rises. Therefore, in order to correct this, the amount of light is increased. There is a need.
- the target light quantity value Qa is corrected by the temperature correction unit 107 in consideration of the change in the relative visibility described here, and the target light quantity based on the limit current value Imax shown in FIGS. 3 to 9 described above. It is preferable to perform this together with the changing operation of the value Qa.
- the main control unit 100 may perform switching (ON / OFF) control as to whether or not to control the drive current accompanied by the change in the target light quantity value Qa. good. Further, regarding the above temperature correction operation, the main control unit 100 may perform switching (ON / OFF) control as necessary to determine whether or not the target light amount value Qa is corrected by the temperature correction unit 107. . For example, when the brightness is important and it is desired to allow some disturbance of the white balance, it is conceivable to turn off the change operation of the target light quantity value Qa based on the limit current value Imax.
- each light source device has one laser light source
- the same control can be performed even when there are a plurality of laser light sources of the same color.
- each of a plurality of laser light sources of the same color may be controlled independently.
- the amount of light emitted from a plurality of light sources is corrected based on the change in relative visibility due to the wavelength change accompanying the temperature change. It is possible to suppress a change in white balance that occurs when the relative visibility changes due to the change. Further, when a laser light source is used as the light source, a change in white balance can be suppressed even when the limit current value Imax is reached due to a temperature rise. By combining the two operations described above, it is possible to provide an image that is as bright as possible and has a constant white balance by using it in the state closest to the limit of the characteristics of the light source.
- FIG. 17 shows a configuration example of the control system of the illumination unit 1 in the projection display device according to the present embodiment.
- the overall configuration of the projection display device may be the same as that shown in FIG.
- the amount of light accompanying the temperature change of another laser light source other than the predetermined laser light source is corrected with a certain predetermined laser light source as a reference.
- correction based on the green laser 11G is performed. 17 is different from the configuration example of FIG. 2 in that the temperature correction unit 107 and the temperature sensor 102 are omitted from the green light source device 101G including the reference green laser 11G.
- the temperature sensor 102 is provided for other laser light sources (blue laser 11B and red laser 11R) other than a predetermined laser light source (green laser 11G).
- the storage unit 104 stores the light amount of each laser light source at a predetermined white balance as a target light amount value Qa.
- the storage unit 104 also stores a temperature at a predetermined white balance as a reference temperature T0.
- the storage unit 104 also stores a maximum current value of the drive current that can be passed by each laser light source as a limited current value Imax.
- the temperature correction unit 107 is a ratio due to a wavelength change accompanying a temperature change of another laser light source when a predetermined laser light source is used as a reference. A change in white balance is suppressed by correcting the amount of light emitted by another laser light source based on the change in visibility.
- the temperature correction unit 107 corrects the target light amount value Qa for other laser light sources based on a predetermined correction coefficient calculated based on a predetermined laser light source, the output value of the temperature sensor 102, and the reference temperature T0.
- the temperature correction unit 107 has a wavelength change amount with respect to the temperature of the laser light source of each light source device.
- Red laser 11R is 0.2nm / ° C
- Green laser 11G is 0.05nm / ° C
- Blue laser 11B is 0.06nm / ° C
- the wavelength at the reference temperature T0 and 25 ° C. is Red laser 11R is 637nm
- Green laser 11G is 520nm Blue laser 11B is 448nm
- the amount of change in relative visibility with respect to temperature is calculated using the amount of change in relative sensitivity when the wavelength is used as a reference and the amount of change in wavelength with respect to the temperature.
- FIG. 18 is a plot of the change in relative visibility with respect to temperature for each laser light source.
- the green laser 11G y 0.0013x + 1 (2)
- the blue laser 11B y 0.0029x +1 (3) It becomes.
- FIG. 19 shows the amount of light quantity change calculated and plotted as follows in order to correct the change in relative visibility when the green laser 11G is used as a reference using the equations (1) to (3).
- the red laser 11R y (0.0013x + 1) / (-0.0085x + 1)
- the blue laser 11B y (0.0013x + 1) / (0.0029x + 1)
- FIG. 20 shows a change in the light amount immediately after the start of lighting of the laser light source as an example when the temperature rapidly increases when the correction of the target light amount value Qa by the temperature correction unit 107 is enabled.
- the increase in the amount of light of the red laser 11R is remarkable, which is due to the relatively large correction amount of the red laser 11R.
- FIG. 21 shows the change in color balance in xy chromaticity coordinates when the target light quantity value Qa is not corrected by the temperature correction unit 107 (temperature correction OFF).
- FIG. 22 is a partially enlarged view of FIG.
- FIG. 23 shows the change in color balance in the xy chromaticity coordinates when the correction of the target light amount value Qa by the temperature correction unit 107 is enabled (temperature correction ON).
- FIG. 24 is a partially enlarged view of FIG.
- 21 to 24 show the xy chromaticity coordinates of the projected image when the temperature of the laser light source changes by about ⁇ 15 ° C. with respect to the reference temperature T0.
- the temperature change by changing the temperature correction of the target light amount value Qa by the temperature correction unit 107 as compared with the case where the temperature correction is not performed (FIGS. 21 and 22).
- the change in white balance is significantly suppressed.
- the target light quantity value Qa is corrected by the temperature correction unit 107 in consideration of the change in relative visibility, and the target based on the limit current value Imax shown in FIGS. 3 to 9 described above. It is preferable to perform together with the change operation of the light quantity value Qa.
- the main control unit 100 switches (ON / OFF) control as necessary whether or not to control the drive current accompanied by the change of the target light quantity value Qa. You may make it do. Further, regarding the temperature correction operation, the main control unit 100 may perform switching (ON / OFF) control as necessary to determine whether or not to correct the target light amount value Qa by the temperature correction unit 107.
- each light source device has one laser light source
- the same control can be performed even when there are a plurality of laser light sources of the same color.
- each of a plurality of laser light sources of the same color may be controlled independently.
- the correction coefficient of the target light amount value Qa may be the same.
- the present technology can take the following configurations.
- a plurality of light sources each emitting light of a different wavelength;
- a correction unit that suppresses a change in white balance by correcting the amount of light emitted from at least one of the plurality of light sources based on a change in relative visibility due to a wavelength change due to a temperature change.
- Lighting device (2) A temperature sensor for detecting the temperature of each of the plurality of light sources;
- the correction unit corrects the amount of light emitted from each light source of the plurality of light sources based on a change in relative visibility due to a wavelength change accompanying a temperature change of each of the plurality of light sources, thereby correcting white balance.
- the lighting device according to (1) wherein the change is suppressed.
- a storage unit that stores a target light amount value, a reference temperature, and a reference wavelength for each of the plurality of light sources at a predetermined white balance;
- the correction unit obtains the wavelength of each light emitted by the plurality of light sources using the output value of the temperature sensor, the reference temperature, and the reference wavelength, and the relative luminous sensitivity at the wavelength of each light and the The illuminating device according to (2), wherein the target light amount value is corrected for each of the plurality of light sources based on relative visibility at a reference wavelength.
- a temperature sensor for detecting a temperature of a light source other than the predetermined light source among the plurality of light sources;
- the correction unit corrects the amount of light emitted from the other light source based on a change in relative visibility due to a wavelength change accompanying a temperature change of the other light source when the predetermined light source is used as a reference.
- the lighting device according to (1) wherein a change in white balance is suppressed.
- a storage unit that stores a target light amount value and a reference temperature for the other light source at a predetermined white balance;
- the correction unit corrects the target light amount value for the other light source based on a predetermined correction coefficient calculated based on the predetermined light source, an output value of the temperature sensor, and the reference temperature.
- the illuminating device according to any one of (1) to (5), further including a main control unit that switches and controls whether or not the light amount is corrected by the correction unit.
- a light amount sensor for detecting the amount of light emitted from each of the plurality of light sources;
- a storage unit for storing a target light amount value for each of the plurality of light sources at a predetermined white balance;
- a current control unit that controls a drive current of each of the plurality of light sources, and Based on the target light amount value and the output value of the light amount sensor, the current control unit determines the current of the drive current so that the light amount of light emitted from each of the plurality of light sources approaches the target light amount value.
- the lighting device according to any one of (1) to (6), wherein a value is set.
- the storage unit further stores a limit current value of a drive current of each of the plurality of light sources,
- the setting control unit changes the set current value and the target light amount value of at least one light source of the plurality of light sources so that the driving current of each of the plurality of light sources does not exceed the limit current value.
- the illumination device according to (7) above.
- the setting control unit determines whether the current value to be set for any one of the plurality of light sources exceeds the limit current value.
- the lighting device according to (8), wherein the set current value is changed and the target light amount value of each of the plurality of light sources is changed.
- the setting control unit A period in which a change in white balance is in a predetermined state when it is determined that the current value to be set exceeds the limit current value for any one of the plurality of light sources.
- the illumination device according to (8) wherein the target light amount value of each of the plurality of light sources is changed when the state deviates from the predetermined state.
- (11) If it becomes out of the predetermined state, The illumination device according to (10), wherein the target light amount value of each of the plurality of light sources is changed so as to approach white balance before the predetermined state is achieved.
- the illumination device according to any one of (8) to (11), further including a main control unit that performs switching control as to whether or not the target light amount value is changed by the setting control unit. (13) Based on changes in relative visibility due to changes in wavelength due to temperature changes, the amount of light emitted from at least one of the light sources that emit light of different wavelengths is corrected to suppress changes in white balance. Yes Light source control method.
- An illumination unit that generates illumination light; A light valve that modulates the illumination light based on video data and emits the modulated light; A projection lens that projects the modulated light from the light valve onto a projection surface;
- the illumination unit is A plurality of light sources each emitting light of a different wavelength;
- a correction unit that suppresses a change in white balance by correcting the amount of light emitted from at least one of the plurality of light sources based on a change in relative visibility due to a wavelength change due to a temperature change.
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Abstract
Description
なお、ここに記載された効果は必ずしも限定されるものではなく、本開示中に記載されたいずれかの効果であってもよい。
1.第1の実施の形態(図1~図16)
1.1 投射型表示装置の全体構成および動作
1.1.1 投射型表示装置の全体構成例
1.1.2 投射型表示装置の動作
1.2 照明部の制御系の構成および動作
1.2.1 照明部の制御系の構成例
1.2.2 照明部の制御動作
1.3 効果
2.第2の実施の形態(図17~図25)
2.1 照明部の制御系の構成
2.2 照明部の制御動作
2.3 効果
3.その他の実施の形態
[1.1 投射型表示装置の全体構成および動作]
(1.1.1 投射型表示装置の全体構成例)
図1は、本開示の第1の実施の形態に係る投射型表示装置(プロジェクタ)の全体構成の一例を示している。
図1には、偏光分離素子として、ワイヤグリッド27を用いた構成例を示したが、ワイヤグリッド27に代えてプリズム状の偏光ビームスプリッタ23を用いた構成であっても良い。
この投射型表示装置では、照明部1によって照明光L1が生成される。ライトバルブ21は、照明光L1を映像データに基づいて変調し、その変調光を出射する。投射レンズ24は、ライトバルブ21からの変調光を投影面30A上に投影する。
(1.2.1 照明部の制御系の構成例)
図2は、照明部1の制御系の一構成例を示している。この投射型表示装置は、照明部1の制御系として、主制御部100と、赤色光源装置101Rと、緑色光源装置101Gと、青色光源装置101Bとを備えている。各光源装置は、温度センサ102と、光量センサ103と、記憶部104と、電流制御部105と、目標光量設定部106と、温度補正部107とを有している。
[APC(Auto Power Control)動作]
主制御部100は、赤色光源装置101R、緑色光源装置101G、および青色光源装置101Bのそれぞれの記憶部104に記憶されている目標光量値Qaをそれぞれの目標光量設定部106に設定し、それぞれの電流制御部105にレーザ駆動を開始させる。
ここで、図11~図16を参照して、温度による一般的なレーザ光源の特性の変化について説明する。図11は、光源の温度と出力光量との関係を示している。図12は、波長と比視感度との関係を示している。図13は、温度によるレーザ光源の波長変化の一例を示している。図14は、波長と比視感度との関係を示している。図15は、温度によるレーザ光源の駆動電流の変化をしている。図16は、温度によるレーザ光源の波長変化の一例を示している。
上述したように、レーザ光源は温度上昇に伴い、閾値電流が上昇する。一方で、レーザ光源を駆動する駆動電流は、常にレーザ光源を破壊しないための制限電流値Imax以下である必要がある。
設定制御部としての主制御部100は、複数のレーザ光源のうちのいずれかの特定の光源に対して、設定しようとする電流値が制限電流値Imaxを超えてしまうと判断される場合に、特定の光源における設定電流値を変更するよう、電流制御部105を制御する。主制御部100はまた、複数のレーザ光源のそれぞれの目標光量値Qaを変更する。以下では例えば、レーザ光源の温度が上昇したときに、図3~図5に示したように、特定の光源として、赤色光源装置101Rの赤色レーザ11Rが制限電流値Imax以下で初期の目標光量値Qaが出力できなくなった場合の動作を例に説明する。
主制御部100は、複数のレーザ光源のうちのいずれかの特定の光源に対して、設定しようとする電流値が制限電流値Imaxを超えてしまうと判断される場合に、ホワイトバランスの変化が所定の状態(ホワイトバランス変化状態)となる期間内では、複数のレーザ光源のうち特定の光源のみ、設定電流値を変更するよう、電流制御部105を制御する。主制御部100はまた、所定の状態では特定の光源のみ、目標光量値Qaを変更する。主制御部100は、所定の状態から外れる状態になった場合には、複数のレーザ光源のそれぞれの目標光量値Qaを、所定の状態となる前のホワイトバランスに近づくように変更する。特に、特定の光源の目標光量値Qaは、所定の状態となる期間で変更する前の目標光量値の値を基準に変更するとよい。
以下、上記第1の例と同様に、特定の光源が赤色レーザ11Rである場合を例に説明する。例えば赤色レーザ11Rについて、電流制御部105が設定しようとする電流値が制限電流値Imaxを超えてしまうと判断される場合に、主制御部100は、特定の光源である赤色レーザ11Rにおける設定電流値が制限電流値Imax以下の値に変更されるよう、電流制御部105を制御する。主制御部100はまた、光量センサ103の出力値の目標光量値Qaに対する比率が一定の比率m(<1)以上である間は、主制御部100は、赤色レーザ11Rの目標光量値Qaのみを変更する。例えば、赤色レーザ11Rの目標光量値Qaのみを一定の比率p(<1)で変更する。この状態をホワイトバランス変化状態と呼ぶ。
各光源装置において、温度補正部107は、温度センサ102の出力値と、記憶部104に記憶されている基準温度T0および基準波長λ0とを用いて、複数のレーザ光源が発するそれぞれの光の波長λを求める。温度補正部107は、それぞれの光の波長での比視感度と基準波長λ0での比視感度とに基づいて、複数のレーザ光源のそれぞれについて目標光量値Qaを補正する。
λ=0.2×(T-T0)+λ0[nm]
なお、実際の運用では、ここで説明した比視感度の変化を考慮した温度補正部107による目標光量値Qaの補正と、上述の図3~図9に示した制限電流値Imaxに基づく目標光量値Qaの変更動作とを合わせて行うことが好ましい。
以上のように、本実施の形態によれば、温度変化に伴う波長変化による比視感度の変化に基づいて、複数の光源が発する光の光量を補正するようにしたので、温度変化に伴う波長変化により比視感度が変化することで発生するホワイトバランスの変化を抑制することができる。また、光源にレーザ光源を使用した場合に、温度上昇により制限電流値Imaxに達した場合でもホワイトバランスの変化を抑制することができる。上述の2つ動作の組み合わせにより、光源の特性の限界に最も近い状態で使用することで、できるだけ明るく、かつホワイトバランスを一定にした映像を提供することができる。
次に、本開示の第2の実施の形態について説明する。以下では、上記第1の実施の形態と同様の構成および作用を有する部分については、適宜説明を省略する。
図17は、本実施の形態の投射型表示装置における照明部1の制御系の一構成例を示している。なお、本実施の形態において、投射型表示装置(プロジェクタ)の全体構成は図1と同様であっても良い。
本実施の形態において、APC動作と電流制限動作は上記第1の実施の形態と同様であってもよい。
本実施の形態では、基準とする緑色光源装置101G以外の各光源装置において、温度補正部107は、所定のレーザ光源を基準にした場合の、他のレーザ光源の温度変化に伴う波長変化による比視感度の変化に基づいて、他のレーザ光源が発する光の光量を補正することで、ホワイトバランスの変化を抑制する。温度補正部107は、所定のレーザ光源を基準に算出された所定の補正係数と、温度センサ102の出力値および基準温度T0とに基づいて、他のレーザ光源について目標光量値Qaを補正する。
赤色レーザ11Rは0.2nm/℃
緑色レーザ11Gは0.05nm/℃
青色レーザ11Bは0.06nm/℃
であり、基準温度T0、25℃のときの波長が、
赤色レーザ11Rは637nm
緑色レーザ11Gは520nm
青色レーザ11Bは448nm
であるときに、その波長を基準にしたときの比視感度変化量と、上記の温度に対する波長変化量とを用いて、温度に対する比視感度変化量を算出する。
赤色レーザ11Rは、
y = -0.0085x + 1 ……(1)
緑色レーザ11Gは、
y = 0.0013x + 1 ……(2)
青色レーザ11Bは、
y = 0.0029x +1 ……(3)
となる。
赤色レーザ11Rは、
y = (0.0013x + 1)/(-0.0085x + 1)
青色レーザ11Bは、
y = (0.0013x + 1)/(0.0029x + 1)
赤色レーザ11Rは、Ar = 0.0103
青色レーザ11Bは、Ab = -0.0016
となるが、これらを、補正係数として使用する。
[変更後の目標光量値]=(温度差分×補正係数)+[現在の目標光量値]
なお、上記第1の実施の形態と同様、比視感度の変化を考慮した温度補正部107による目標光量値Qaの補正と、上述の図3~図9に示した制限電流値Imaxに基づく目標光量値Qaの変更動作とを合わせて行うことが好ましい。
本実施の形態によれば、上記第1の実施の形態に比べて、記憶部104に基準波長λ0を記憶しておく必要がない。また、温度センサ102および温度補正部107の数を減らすことができる。それにも関わらず、比視感度の変化に伴うホワイトバランスの変化を大幅に低減することができる。
本開示による技術は、上記各実施の形態の説明に限定されず種々の変形実施が可能である。
(1)
それぞれが異なる波長の光を発する複数の光源と、
温度変化に伴う波長変化による比視感度の変化に基づいて、前記複数の光源のうち少なくとも1つの光源が発する光の光量を補正することで、ホワイトバランスの変化を抑制する補正部と
を備えた照明装置。
(2)
前記複数の光源のそれぞれの温度を検出する温度センサをさらに備え、
前記補正部は、前記複数の光源のそれぞれの温度変化に伴う波長変化による比視感度の変化に基づいて、前記複数の光源のそれぞれの光源が発する光の光量を補正することで、ホワイトバランスの変化を抑制する
上記(1)に記載の照明装置。
(3)
所定のホワイトバランスのときの前記複数の光源のそれぞれについての目標光量値、基準温度、および基準波長を記憶する記憶部をさらに備え、
前記補正部は、前記温度センサの出力値と前記基準温度と前記基準波長とを用いて前記複数の光源が発するそれぞれの光の波長を求め、前記それぞれの光の波長での比視感度と前記基準波長での比視感度とに基づいて、前記複数の光源のそれぞれについて前記目標光量値を補正する
上記(2)に記載の照明装置。
(4)
前記複数の光源のうち、所定の光源以外の他の光源の温度を検出する温度センサをさらに備え、
前記補正部は、前記所定の光源を基準にした場合の、前記他の光源の温度変化に伴う波長変化による比視感度の変化に基づいて、前記他の光源が発する光の光量を補正することで、ホワイトバランスの変化を抑制する
上記(1)に記載の照明装置。
(5)
所定のホワイトバランスのときの前記他の光源についての目標光量値、および基準温度を記憶する記憶部をさらに備え、
前記補正部は、前記所定の光源を基準に算出された所定の補正係数と、前記温度センサの出力値および前記基準温度とに基づいて、前記他の光源について前記目標光量値を補正する
上記(4)に記載の照明装置。
(6)
前記補正部による光量の補正を行うか否かを切り替え制御する主制御部をさらに備えた
上記(1)ないし(5)のいずれか1つに記載の照明装置。
(7)
前記複数の光源が発するそれぞれの光の光量を検出する光量センサと、
所定のホワイトバランスのときの前記複数の光源のそれぞれについての目標光量値を記憶する記憶部と、
前記複数の光源のそれぞれの駆動電流を制御する電流制御部と
をさらに備え、
前記電流制御部は、前記目標光量値と前記光量センサの出力値とに基づいて、前記複数の光源のそれぞれの光源が発する光の光量が前記目標光量値に近づくように、前記駆動電流の電流値を設定する
上記(1)ないし(6)のいずれか1つに記載の照明装置。
(8)
前記目標光量値を変更する設定制御部をさらに備え、
前記記憶部は、前記複数の光源のそれぞれの駆動電流の制限電流値をさらに記憶し、
前記設定制御部は、前記複数の光源のそれぞれの前記駆動電流が前記制限電流値を超えないように、前記複数の光源の少なくとも1つの光源の前記設定電流値と前記目標光量値とを変更する
上記(7)に記載の照明装置。
(9)
前記設定制御部は、前記複数の光源のうちのいずれかの特定の光源に対して、設定しようとする電流値が前記制限電流値を超えてしまうと判断される場合に、前記特定の光源における前記設定電流値を変更すると共に、前記複数の光源のそれぞれの前記目標光量値を変更する
上記(8)に記載の照明装置。
(10)
前記設定制御部は、
前記複数の光源のうちのいずれかの特定の光源に対して、設定しようとする電流値が前記制限電流値を超えてしまうと判断される場合に、ホワイトバランスの変化が所定の状態となる期間内では、前記複数の光源のうち前記特定の光源のみ、前記設定電流値と前記目標光量値とを変更し、
前記所定の状態から外れる状態になった場合には、前記複数の光源のそれぞれの前記目標光量値を変更する
上記(8)に記載の照明装置。
(11)
前記所定の状態から外れる状態になった場合には、
前記複数の光源のそれぞれの前記目標光量値を、前記所定の状態となる前のホワイトバランスに近づくように変更する
上記(10)に記載の照明装置。
(12)
前記設定制御部による前記目標光量値の変更を行うか否かを切り替え制御する主制御部をさらに備えた
上記(8)ないし(11)のいずれか1つに記載の照明装置。
(13)
温度変化に伴う波長変化による比視感度の変化に基づいて、それぞれが異なる波長の光を発する複数の光源のうち少なくとも1つの光源が発する光の光量を補正することで、ホワイトバランスの変化を抑制する
光源制御方法。
(14)
照明光を生成する照明部と、
前記照明光を映像データに基づいて変調し、その変調光を出射するライトバルブと、
前記ライトバルブからの前記変調光を投影面上に投影する投射レンズと
を含み、
前記照明部が、
それぞれが異なる波長の光を発する複数の光源と、
温度変化に伴う波長変化による比視感度の変化に基づいて、前記複数の光源のうち少なくとも1つの光源が発する光の光量を補正することで、ホワイトバランスの変化を抑制する補正部と
を備えた投射型表示装置。
Claims (14)
- それぞれが異なる波長の光を発する複数の光源と、
温度変化に伴う波長変化による比視感度の変化に基づいて、前記複数の光源のうち少なくとも1つの光源が発する光の光量を補正することで、ホワイトバランスの変化を抑制する補正部と
を備えた照明装置。 - 前記複数の光源のそれぞれの温度を検出する温度センサをさらに備え、
前記補正部は、前記複数の光源のそれぞれの温度変化に伴う波長変化による比視感度の変化に基づいて、前記複数の光源のそれぞれの光源が発する光の光量を補正することで、ホワイトバランスの変化を抑制する
請求項1に記載の照明装置。 - 所定のホワイトバランスのときの前記複数の光源のそれぞれについての目標光量値、基準温度、および基準波長を記憶する記憶部をさらに備え、
前記補正部は、前記温度センサの出力値と前記基準温度と前記基準波長とを用いて前記複数の光源が発するそれぞれの光の波長を求め、前記それぞれの光の波長での比視感度と前記基準波長での比視感度とに基づいて、前記複数の光源のそれぞれについて前記目標光量値を補正する
請求項2に記載の照明装置。 - 前記複数の光源のうち、所定の光源以外の他の光源の温度を検出する温度センサをさらに備え、
前記補正部は、前記所定の光源を基準にした場合の、前記他の光源の温度変化に伴う波長変化による比視感度の変化に基づいて、前記他の光源が発する光の光量を補正することで、ホワイトバランスの変化を抑制する
請求項1に記載の照明装置。 - 所定のホワイトバランスのときの前記他の光源についての目標光量値、および基準温度を記憶する記憶部をさらに備え、
前記補正部は、前記所定の光源を基準に算出された所定の補正係数と、前記温度センサの出力値および前記基準温度とに基づいて、前記他の光源について前記目標光量値を補正する
請求項4に記載の照明装置。 - 前記補正部による光量の補正を行うか否かを切り替え制御する主制御部をさらに備えた
請求項1に記載の照明装置。 - 前記複数の光源が発するそれぞれの光の光量を検出する光量センサと、
所定のホワイトバランスのときの前記複数の光源のそれぞれについての目標光量値を記憶する記憶部と、
前記複数の光源のそれぞれの駆動電流を制御する電流制御部と
をさらに備え、
前記電流制御部は、前記目標光量値と前記光量センサの出力値とに基づいて、前記複数の光源のそれぞれの光源が発する光の光量が前記目標光量値に近づくように、前記駆動電流の電流値を設定する
請求項1に記載の照明装置。 - 前記目標光量値を変更する設定制御部をさらに備え、
前記記憶部は、前記複数の光源のそれぞれの駆動電流の制限電流値をさらに記憶し、
前記設定制御部は、前記複数の光源のそれぞれの前記駆動電流が前記制限電流値を超えないように、前記複数の光源の少なくとも1つの光源の前記設定電流値と前記目標光量値とを変更する
請求項7に記載の照明装置。 - 前記設定制御部は、前記複数の光源のうちのいずれかの特定の光源に対して、設定しようとする電流値が前記制限電流値を超えてしまうと判断される場合に、前記特定の光源における前記設定電流値を変更すると共に、前記複数の光源のそれぞれの前記目標光量値を変更する
請求項8に記載の照明装置。 - 前記設定制御部は、
前記複数の光源のうちのいずれかの特定の光源に対して、設定しようとする電流値が前記制限電流値を超えてしまうと判断される場合に、ホワイトバランスの変化が所定の状態となる期間内では、前記複数の光源のうち前記特定の光源のみ、前記設定電流値と前記目標光量値とを変更し、
前記所定の状態から外れる状態になった場合には、前記複数の光源のそれぞれの前記目標光量値を変更する
請求項8に記載の照明装置。 - 前記所定の状態から外れる状態になった場合には、
前記複数の光源のそれぞれの前記目標光量値を、前記所定の状態となる前のホワイトバランスに近づくように変更する
請求項10に記載の照明装置。 - 前記設定制御部による前記目標光量値の変更を行うか否かを切り替え制御する主制御部をさらに備えた
請求項8に記載の照明装置。 - 温度変化に伴う波長変化による比視感度の変化に基づいて、それぞれが異なる波長の光を発する複数の光源のうち少なくとも1つの光源が発する光の光量を補正することで、ホワイトバランスの変化を抑制する
光源制御方法。 - 照明光を生成する照明部と、
前記照明光を映像データに基づいて変調し、その変調光を出射するライトバルブと、
前記ライトバルブからの前記変調光を投影面上に投影する投射レンズと
を含み、
前記照明部が、
それぞれが異なる波長の光を発する複数の光源と、
温度変化に伴う波長変化による比視感度の変化に基づいて、前記複数の光源のうち少なくとも1つの光源が発する光の光量を補正することで、ホワイトバランスの変化を抑制する補正部と
を備えた投射型表示装置。
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US11877101B2 (en) * | 2017-12-04 | 2024-01-16 | Sony Corporation | Image display apparatus |
CN111314677A (zh) * | 2018-12-11 | 2020-06-19 | 中强光电股份有限公司 | 投影***、影像解析度增强装置的保护电路及电流监控方法 |
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