WO2015186238A1 - 投射型表示装置およびその制御方法 - Google Patents
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- WO2015186238A1 WO2015186238A1 PCT/JP2014/065046 JP2014065046W WO2015186238A1 WO 2015186238 A1 WO2015186238 A1 WO 2015186238A1 JP 2014065046 W JP2014065046 W JP 2014065046W WO 2015186238 A1 WO2015186238 A1 WO 2015186238A1
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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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- 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
- G03B21/005—Projectors using an electronic spatial light modulator but not peculiar thereto
- G03B21/008—Projectors using an electronic spatial light modulator but not peculiar thereto using micromirror devices
-
- 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
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B21/00—Projectors or projection-type viewers; Accessories therefor
- G03B21/14—Details
- G03B21/20—Lamp housings
- G03B21/2053—Intensity control of illuminating light
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B21/00—Projectors or projection-type viewers; Accessories therefor
- G03B21/14—Details
- G03B21/20—Lamp housings
- G03B21/2086—Security or safety means in lamp houses
-
- 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
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N9/00—Details of colour television systems
- H04N9/12—Picture reproducers
- H04N9/31—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]
- H04N9/3102—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM] using two-dimensional electronic spatial light modulators
- H04N9/312—Driving therefor
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N9/00—Details of colour television systems
- H04N9/12—Picture reproducers
- H04N9/31—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]
- H04N9/3141—Constructional details thereof
- H04N9/315—Modulator illumination systems
- H04N9/3155—Modulator illumination systems for controlling the light source
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N9/00—Details of colour television systems
- H04N9/12—Picture reproducers
- H04N9/31—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]
- H04N9/3141—Constructional details thereof
- H04N9/315—Modulator illumination systems
- H04N9/3161—Modulator illumination systems using laser light sources
Definitions
- the present invention relates to a projection display device and a control method thereof.
- some projection display devices such as projectors that modulate and project light output from a light source include a high-power semiconductor laser element (LD) as a light source.
- LD semiconductor laser element
- the light output from a semiconductor laser element is controlled by a drive current supplied to the semiconductor laser element.
- a drive current supplied to the semiconductor laser element if an abnormality such as a component failure occurs in the drive device that supplies the drive current to the semiconductor laser element, an overcurrent exceeding the rated operating range flows to the semiconductor laser element, and high energy density light is output from the semiconductor laser element.
- high energy density light is output (projected) to the outside.
- Patent Document 1 Japanese Patent Application Laid-Open No. 2012-084630
- a switch is provided between a LD that supplies a drive current to the LD and the LD detects the current value of the drive current, and based on the detection result.
- a technique for controlling on / off of a switch is disclosed. According to this technique, when the detected drive current value exceeds a predetermined threshold value, it is determined that the drive current is excessive (overcurrent), and the switch is turned off to shut off the drive device and the LD. To do. Since the driving current is not supplied to the LD by shutting off the driving device and the LD, it is possible to suppress the output of high energy density light from the LD.
- the drive current flowing through the LD is stopped without being cut off using a switch, it takes time to stably return the drive device or the semiconductor laser element to the normal operation state, or the drive current is stopped. Delay time may occur.
- An object of the present invention is to provide a driving device, a control method therefor, and a projection display device that can suppress the decrease in convenience and / or the output of unnecessary light to the outside of the device.
- the projection display device of the present invention provides: A laser light source that outputs laser light in response to a current supply; A modulation element for modulating and emitting the output light of the laser light source; A projection lens for projecting incident light through the modulation element; A drive unit that drives the laser light source and includes a current detection unit that detects a current value of a current flowing through the laser light source; When the current value detected by the current detection unit is greater than a first threshold value, the drive of the modulation element is controlled so that the emitted light of the modulation element does not enter the projection lens, and the current detected by the current detection unit And a control unit that causes the driving unit to cut off the supply of current to the laser light source when the value becomes larger than a second threshold value that is larger than the first threshold value.
- a control method for a projection display device of the present invention includes: Projection-type display comprising: a laser light source that outputs laser light in response to a current supply; a modulation element that modulates and emits the output light of the laser light source; and a projection lens that projects input light through the modulation element
- Projection-type display comprising: a laser light source that outputs laser light in response to a current supply; a modulation element that modulates and emits the output light of the laser light source; and a projection lens that projects input light through the modulation element
- Detecting the current value of the current flowing through the laser light source Detecting the current value of the current flowing through the laser light source, When the detected current value becomes larger than the first threshold value, the drive of the modulation element is controlled so that the emitted light of the modulation element is not incident on the projection lens, and the detected current value is less than the first threshold value. Is larger than the second threshold value, the supply of current to the laser light source is interrupted.
- FIG. 1 It is a block diagram which shows the principal part structure of the projection type display apparatus of one Embodiment of this invention. It is a figure for demonstrating the related method. It is a figure for demonstrating operation
- FIG. 1 is a block diagram showing a main configuration of a projection display device 100 according to an embodiment of the present invention.
- a projection display device 100 shown in FIG. 1 includes a semiconductor laser element 101, a DMD (Digital Mirror Device) 102, a projection lens 103, a DMD drive unit 104, a drive unit 105, a light absorption unit 108, and a determination unit. 109.
- a white arrow indicates a light beam.
- the semiconductor laser element 101 is a laser light source, and outputs laser light in response to supply of drive current.
- a plurality of semiconductor laser elements 101 are provided and connected in series.
- the DMD 102 modulates the output light of the semiconductor laser element 101 and emits it. Specifically, the DMD 102 modulates the output light of the semiconductor laser element 101 by selectively reflecting it.
- the DMD 102 is an example of a modulation element.
- Projection lens 103 projects input light through DMD 102.
- the DMD driving unit 104 controls the driving of the DMD 102.
- the driving unit 105 supplies a driving current to the semiconductor laser element 101 and controls the driving of the semiconductor laser element 101.
- the drive unit 105 includes a current detection unit 106 and a switch unit 107.
- the current detection unit 106 detects the current value of the drive current flowing through the semiconductor laser element 101 and outputs the detection result to the determination unit 109.
- the switch unit 107 is turned on or off according to the control of the determination unit 109.
- a drive current is supplied to the semiconductor laser element 101.
- the switch unit 107 is off, the supply of drive current to the semiconductor laser element 101 is interrupted.
- the light absorbing unit 108 is provided at a position where the emitted light of the DMD 102 is irradiated when the DMD 102 is in a predetermined driving state, and absorbs the laser light.
- the light output from the semiconductor laser element 101 is not directed toward the projection lens 103 but the light absorption unit 108 as shown by the dotted white arrow in FIG. It shall be emitted toward
- the determination unit 109 causes the drive unit 105 to stop supplying the drive current to the semiconductor laser element 101 according to the current value of the drive current detected by the current detection unit 106.
- the determination unit 109 instructs the DMD driving unit 104 to control the driving of the DMD 102 according to the current value of the driving current detected by the current detection unit 106.
- the DMD driving unit 104 and the determination unit 109 constitute a control unit 110.
- the switch unit 107 is set to ON (closed state).
- the drive unit 105 supplies a drive current If within a rated operation range to the plurality of semiconductor laser elements 101 connected in series.
- the semiconductor laser element 101 emits light with a luminance corresponding to the amount of the drive current If.
- the DMD driving unit 104 drives the DMD 102 so that the output light of the semiconductor laser element 101 is modulated according to the video signal and the modulated light is incident on the projection lens 103.
- the current detection unit 106 detects the current value of the drive current If flowing through the semiconductor laser element 101, for example, at predetermined time intervals.
- the determination unit 109 compares the current value of the drive current If detected by the current detection unit 106 with a predetermined threshold value. Specifically, the determination unit 109 compares the current value of the drive current If with two threshold values (first and second threshold values).
- the first and second threshold values are larger than the rated operating range of the drive current, and the current value (output stop current value) at which an overcurrent flows and the output of light from the semiconductor laser element 101 needs to be stopped is required. Is also a small value.
- the first and second threshold values are small values that take into account the margin from the output stop current value to noise due to overshoot of the drive current If or static electricity.
- the first threshold value is smaller than the second threshold value. Therefore, the output stop current value is larger than the second threshold value, and the second threshold value is larger than the first threshold value.
- the determination unit 109 determines whether or not the current value of the drive current If detected by the current detection unit 106 is greater than the first threshold value. If it is determined that the current value of the drive current If is not larger than the first threshold value, the determination unit 109 repeats the comparison process with the first threshold value.
- the determination unit 109 instructs the DMD drive unit 104 to turn off the DMD 102.
- the DMD driving unit 104 turns off the DMD 102.
- the determination unit 109 controls the driving of the DMD 102 so that the light emitted from the DMD 102 is not incident on the projection lens 103 when the driving current If detected by the current detection unit 106 is larger than the first threshold value.
- the light reflected toward the light absorption unit 108 is absorbed by the light absorption unit 108. Therefore, the output light of the semiconductor laser element 101 can be prevented from being output to the outside of the projection display device 100.
- the determination unit 109 instructs the DMD drive unit 104 to turn on the DMD 102.
- the DMD driving unit 104 turns on the DMD 102.
- the DMD 102 is turned on, the output light of the semiconductor laser element 101 is reflected by the DMD 102 toward the projection lens 103 and is projected from the projection lens 103. That is, the operating state of the projection display device 100 returns to the normal operating state.
- the determination unit 109 determines whether the current value of the drive current If is greater than the second threshold.
- the determination unit 109 When it is determined that the current value of the drive current If is not greater than the second threshold value, the determination unit 109 causes the DMD drive unit 104 to turn off the DMD 102. Note that the determination unit 109 turns off the switch unit 107, for example, when a state where the current value of the drive current If is greater than the first threshold and not greater than the second threshold continues for a predetermined time or longer. By doing so, it is possible to prevent a state in which projection from the projection display device 100 cannot be performed for a long time.
- the determination unit 109 interrupts the drive unit 105 from supplying the drive current to the semiconductor laser element 101 as indicated by a broken line in FIG. Let For example, the determination unit 109 causes the drive unit 105 to stop outputting the drive current from the current source or turn off the switch unit 107. By doing so, the supply of the drive current If to the semiconductor laser element 101 is cut off, and the semiconductor laser element 101 stops emitting light.
- the drive circuit that supplies the drive current If to the semiconductor laser element 101 is opened, and the detection value of the current detection unit 106 becomes an abnormal value.
- the determination unit 109 stops the operation of the entire drive device for supplying the drive current If to the semiconductor laser element 101.
- FIG. 2 is a diagram illustrating an example of a temporal change in the current value of the drive current If.
- the drive current If is greater than the output stop current value Ib.
- a threshold Ith that is small by a margin for noise caused by overshoot or static electricity is set. Then, when the current value of the drive current If becomes larger than the threshold value Ith, control for turning off the switch is started.
- the overcurrent is generated between the time t2 and the time t12. Is supplied to the semiconductor laser element 101. As a result, light with high energy density is output from the semiconductor laser element 101, and the light may be output to the outside of the projection display device.
- the current value of the drive current If is compared with two threshold values (a first threshold value Ith1 and a second threshold value Ith2).
- a first threshold value Ith1 and a second threshold value Ith2 two threshold values
- FIG. 3 a case where the switch unit 107 is switched on and off will be described as an example.
- the current value of the drive current If starts increasing at time t ⁇ b> 1 from a state where the current value is smaller than the rated current Ia. Then, it is assumed that the output stop current value Ib is reached at time t2, and the state where the drive current If exceeds the output stop current value Ib continues thereafter.
- the determination unit 109 determines whether or not the current value of the drive current If is greater than the first threshold value Ith1. When the current value of the drive current If becomes greater than the first threshold value Ith1 at time t21, the determination unit 109 instructs the DMD drive unit 104 to turn off the DMD 102. In response to the instruction from the determination unit 109, the DMD driving unit 104 turns off the DMD 102.
- the output light of the semiconductor laser element 101 is reflected by the DMD 102 toward the light absorption unit 108 and absorbed by the light absorption unit 108. Therefore, the output light of the semiconductor laser element 101 can be prevented from being output to the outside of the projection display device 100.
- the DMD 102 can respond at high speed. Therefore, according to the instruction of the determination unit 109, the DMD 102 can be turned off without a substantial delay so that the output light of the semiconductor laser element 101 is not output to the outside of the projection display device 100.
- the determination unit 109 instructs the DMD drive unit 104 to turn on the DMD 102.
- the DMD driving unit 104 turns on the DMD 102.
- the DMD 102 is turned on, the output light of the semiconductor laser element 101 is reflected by the DMD 102 toward the projection lens 103 and projected from the projection lens 103. That is, the operating state of the projection display device 100 returns to the normal operating state.
- the DMD 102 can respond at high speed, it can return to the normal operation state without substantial delay after the instruction from the determination unit 109.
- the determination unit 109 determines whether the current value of the drive current If is greater than the second threshold Ith2. If the current value of the drive current If becomes greater than the second threshold value Ith2 at time t22, the determination unit 109 turns off the switch unit 107.
- a delay time tdelay occurs after the control for turning off the switch is started until the switch is actually turned off. Therefore, the switch is turned off at time t23 when a predetermined delay time tdelay has elapsed from time t22.
- the current value of the drive current If becomes zero.
- the overcurrent is generated between the time t2 and the time t23. Is supplied to the semiconductor laser element 101. As a result, light having a high energy density is output from the semiconductor laser element 101.
- the DMD 102 is turned off at time t21, and the output light of the semiconductor laser element 101 is not output to the outside of the projection display device 100. Therefore, even if high energy density light is output from the semiconductor laser element 101, the light can be prevented from being output to the outside of the projection display device 100.
- the current value of the drive current If becomes larger than the second threshold value Ith2 it is possible to prevent the overcurrent from continuing to flow through the semiconductor laser element 101 by turning off the switch unit 107.
- the projection display device 100 of this embodiment includes a semiconductor laser element 101, a DMD 102 that modulates and emits output light from the semiconductor laser element 101, and a projection lens 103 that projects input light via the DMD 102.
- the projection display device 100 includes a drive unit 105 including a current detection unit 106 that drives the semiconductor laser element 101 and detects a current value of a current flowing through the semiconductor laser element 101, and a control unit 110.
- the control unit 110 controls the driving of the DMD 102 so that the emitted light of the DMD 102 is not incident on the projection lens 103.
- the control unit 110 causes the driving unit 105 to cut off the supply of current to the semiconductor laser element 101.
- the operation stop state is less likely to occur, and the possibility that convenience is impaired can be reduced.
- the modulation element is a DMD
- the present invention is not limited to this.
- a liquid crystal display element or the like may be used as the modulation element.
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Abstract
Description
電流の供給に応じてレーザー光を出力するレーザー光源と、
前記レーザー光源の出力光を変調して出射する変調素子と、
前記変調素子を介した入射光を投射する投射レンズと、
前記レーザー光源を駆動し、前記レーザー光源に流れる電流の電流値を検出する電流検出部を備える駆動部と、
前記電流検出部が検出した電流値が第1の閾値より大きくなると、前記変調素子の出射光が前記投射レンズに入射されないように前記変調素子の駆動を制御し、前記電流検出部が検出した電流値が前記第1の閾値よりも大きな第2の閾値より大きくなると、前記駆動部に前記レーザー光源への電流の供給を遮断させる制御部と、を有する。
電流の供給に応じてレーザー光を出力するレーザー光源と、前記レーザー光源の出力光を変調して出射する変調素子と、前記変調素子を介した入力光を投射する投射レンズとを備える投射型表示装置の制御方法において、
前記レーザー光源に流れる電流の電流値を検出し、
前記検出した電流値が第1の閾値より大きくなると、前記変調素子の出射光が前記投射レンズに入射されないように前記変調素子の駆動を制御し、前記検出した電流値が前記第1の閾値よりも大きな第2の閾値より大きくなると、前記レーザー光源への電流の供給を遮断させる。
Claims (8)
- 電流の供給に応じてレーザー光を出力するレーザー光源と、
前記レーザー光源の出力光を変調して出射する変調素子と、
前記変調素子を介した入射光を投射する投射レンズと、
前記レーザー光源を駆動し、前記レーザー光源に流れる電流の電流値を検出する電流検出部を備える駆動部と、
前記電流検出部が検出した電流値が第1の閾値より大きくなると、前記変調素子の出射光が前記投射レンズに入射されないように前記変調素子の駆動を制御し、前記電流検出部が検出した電流値が前記第1の閾値よりも大きな第2の閾値より大きくなると、前記駆動部に前記レーザー光源への電流の供給を遮断させる制御部と、を有することを特徴とする投射型表示装置。 - 請求項1記載の投射型表示装置において、
前記駆動部は、前記レーザー光源への電流の供給を遮断するスイッチ部を備え、
前記制御部は、前記電流検出部が検出した電流値が前記第2の閾値より大きくなると、前記スイッチ部に前記レーザー光源への電流の供給を遮断させることを特徴とする投射型表示装置。 - 請求項1または2記載の投射型表示装置において、
前記レーザー光を吸収する光吸収部を備え、
前記制御部は、前記電流検出部が検出した電流値が前記第1の閾値より大きくなると、前記変調素子の出射の光が前記光吸収部に入射されるように前記変調素子を駆動することを特徴とする投射型表示装置。 - 請求項1から3のいずれか1項に記載の投射型表示装置において、
前記変調素子は、デジタルミラーデバイスであることを特徴とする投射型表示装置。 - 電流の供給に応じてレーザー光を出力するレーザー光源と、前記レーザー光源の出力光を変調して出射する変調素子と、前記変調素子を介した入射光を投射する投射レンズとを備える投射型表示装置の制御方法において、
前記レーザー光源に流れる電流の電流値を検出し、
前記検出した電流値が第1の閾値より大きくなると、前記変調素子の出射光が前記投射レンズに入射されないように前記変調素子の駆動を制御し、前記検出した電流値が前記第1の閾値よりも大きな第2の閾値より大きくなると、前記レーザー光源への電流の供給を遮断させることを特徴とする投射型表示装置の制御方法。 - 請求項5記載の投射型表示装置の制御方法において、
前記投射型表示装置には前記レーザー光源への電流の供給を遮断するスイッチ部が設けられ、
前記検出した電流値が前記第2の閾値より大きくなると、前記スイッチ部に前記レーザー光源への電流の供給を遮断させることを特徴とする投射型表示装置の制御方法。 - 請求項5または6記載の投射型表示装置の制御方法において、
前記投射型表示装置には前記レーザー光を吸収する光吸収部が設けられ、
前記検出した電流値が前記第1の閾値より大きくなると、前記変調素子の出射光が前記光吸収部に入射されるように前記変調素子を駆動することを特徴とする投射型表示装置の制御方法。 - 請求項5から7のいずれか1項に記載の投射型表示装置の制御方法において、
前記変調素子は、デジタルミラーデバイスであることを特徴とする投射型表示装置の制御方法。
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PCT/JP2014/065046 WO2015186238A1 (ja) | 2014-06-06 | 2014-06-06 | 投射型表示装置およびその制御方法 |
US15/315,331 US9906763B2 (en) | 2014-06-06 | 2014-06-06 | Projection type display apparatus and method of controlling the same |
JP2016525644A JP6238386B2 (ja) | 2014-06-06 | 2014-06-06 | 投射型表示装置およびその制御方法 |
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US9906763B2 (en) | 2018-02-27 |
JPWO2015186238A1 (ja) | 2017-04-20 |
JP6238386B2 (ja) | 2017-11-29 |
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