WO2012063336A1 - Visionneuse du type à projection et son procédé de commande - Google Patents

Visionneuse du type à projection et son procédé de commande Download PDF

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Publication number
WO2012063336A1
WO2012063336A1 PCT/JP2010/070038 JP2010070038W WO2012063336A1 WO 2012063336 A1 WO2012063336 A1 WO 2012063336A1 JP 2010070038 W JP2010070038 W JP 2010070038W WO 2012063336 A1 WO2012063336 A1 WO 2012063336A1
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WO
WIPO (PCT)
Prior art keywords
power
value
signal
lamp
light
Prior art date
Application number
PCT/JP2010/070038
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English (en)
Japanese (ja)
Inventor
巳千男 小林
幸則 潮屋
賢司 神坂
弘記 田中
Original Assignee
Ｎｅｃディスプレイソリューションズ株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Application filed by Ｎｅｃディスプレイソリューションズ株式会社 filed Critical Ｎｅｃディスプレイソリューションズ株式会社
Priority to JP2012542758A priority Critical patent/JP5605864B2/ja
Priority to PCT/JP2010/070038 priority patent/WO2012063336A1/fr
Publication of WO2012063336A1 publication Critical patent/WO2012063336A1/fr

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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
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B21/00—Projectors or projection-type viewers; Accessories therefor
    • G03B21/14—Details
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B21/00—Projectors or projection-type viewers; Accessories therefor
    • G03B21/14—Details
    • G03B21/20—Lamp housings
    • G03B21/2053—Intensity control of illuminating light
    • 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]
    • H04N9/3179—Video signal processing therefor
    • H04N9/3182—Colour adjustment, e.g. white balance, shading or gamut

Definitions

  • the present invention relates to a projection display device and a control method thereof.
  • a projection display device that projects video light based on a video signal modulates a lamp and light emitted from the lamp (hereinafter referred to as lamp-emitted light) in accordance with the video signal and emits it as video light.
  • a display element In recent years, in such a projection type display element, reduction of power consumption and improvement of contrast of projected images have become important issues.
  • the power value of the lamp lighting power can be lowered.
  • the projection display device has a function of accepting a power value setting from the outside, and the user lowers the power value of the lighting power by the power value setting.
  • the power value of the lighting power is lowered, the brightness of the lamp is lowered and the image light is darkened.
  • Patent Document 1 Japanese Patent Laid-Open No. 11-65528
  • the lower the maximum value of the amplitude of the video signal the lower the power value of the lighting power and the same as the case where the brightness of the entire screen does not decrease the power value.
  • a method for correcting the amplitude value of a video signal is disclosed. According to this method, image light having the same brightness can be projected with less power consumption.
  • Patent Document 2 Japanese Patent Laid-Open No. 2002-23106 discloses a projection type optical aperture that transmits a lamp emission light and has a variable transmission amount when transmitted. A method for improving the contrast of a projected image by controlling the transmission amount of an optical aperture provided in a display device is disclosed.
  • the power consumption is reduced and the contrast of the projected image is improved. be able to.
  • a discharge lamp is used as a lamp of a projection display device.
  • a halogen cycle occurs in which the electrode material evaporated from the electrodes accompanying the discharge between the electrodes of the lamp adheres to the electrodes again by the action of the halogen gas enclosed in the arc tube of the lamp.
  • the halogen cycle does not occur stably.
  • Patent Document 3 Japanese Patent Application Laid-Open No. 2009-093662
  • the lighting power supply state is monitored, and when it is detected that the power whose supply power value is lower than a predetermined threshold value continues for a certain time or longer, the lighting power
  • a technique is disclosed in which the state of the electrodes and the arc tube is returned to normal by performing a lamp refresh process in which the power value of the lamp is changed to a predetermined value equal to or greater than a predetermined threshold for a predetermined time.
  • the lamp is used when the power value of the lighting power is lower than a predetermined threshold value.
  • the power value of the lighting power changes. Changing the power value of the lighting power means that the brightness of the lamp is changed, which causes a problem that the brightness of the image light changes.
  • the projection display device of the present invention provides A projection type display device that projects video light based on a video signal, A lamp, A lamp driver for supplying lighting power to the lamp; An optical diaphragm that transmits light emitted from the lamp and has a variable transmission amount when transmitted; A display element that modulates the light emitted from the lamp according to the amplitude of the video signal and emits the light as the video light; An analysis unit that specifies a power value of the lighting power and a transmission amount of the optical aperture according to the video signal, and outputs a first signal indicating the specified power value and a second signal indicating the transmission amount When, The lamp driving unit is supplied with the lighting power of the power value indicated by the first signal, and when the power value setting is input from the outside, the lighting power indicated by the power value setting is supplied.
  • the power value of the lighting power is set to a predetermined value equal to or higher than the threshold value for a predetermined time.
  • a power determination unit that outputs a third signal indicating a power value before and after the change, The optical diaphragm is controlled according to the second signal, and when the third signal is input, the amount of the image light is constant before and after the change of the power value indicated by the third signal.
  • a diaphragm control unit that specifies the transmission amount of the optical diaphragm and controls the optical diaphragm.
  • a control method for a projection display device of the present invention includes: A lamp, a lamp driving unit that supplies lighting power to the lamp, an optical diaphragm that transmits the light emitted from the lamp and has a variable transmission amount when transmitted, and the light emitted from the lamp
  • a control method for a projection display device comprising a display element that modulates according to the amplitude of a video signal and emits the light as video light
  • An analysis unit identifies a power value of the lighting power and a transmission amount of the optical aperture according to the video signal, and a first signal indicating the specified power value and a second signal indicating the transmission amount.
  • the power determination unit causes the lamp driving unit to supply the lighting power of the power value indicated by the first signal, and when the power value setting is input from the outside, the lighting power indicated in the power value setting And monitoring the supply state to these lamp driving units, and detecting that the power whose supply power value is lower than a predetermined threshold value continues for a certain time or more, the power value of the lighting power is set to be equal to or higher than the threshold value.
  • a power determining unit that changes the power to a predetermined value for a certain time and outputs a third signal indicating a power value before and after the change;
  • a diaphragm control unit controls the optical diaphragm according to the second signal, and when the third signal is input, before and after the change of the power value indicated by the third signal, the image light The amount of light transmitted through the optical diaphragm is determined to be constant, and the optical diaphragm is controlled.
  • the power consumption can be reduced and the contrast of the projected image can be improved, and the change in the brightness of the image light can be suppressed even when the power value of the lighting power is changed.
  • FIG. 1 It is a block diagram which shows the structure of the projection type display apparatus of one Embodiment of this invention. It is a figure which shows the structure of the optical aperture stop shown in FIG. It is a figure which shows the lighting power of the lamp
  • FIG. 1 is a block diagram showing a configuration of a projection display device 100 according to an embodiment of the present invention.
  • a solid line arrow indicates an electric signal
  • a white arrow indicates a light beam.
  • the 1 includes an analysis unit 101, a power determination unit 102, a lamp driving unit 103, a lamp 104, an optical diaphragm 105, a light quantity conversion unit 106, a diaphragm control unit 107, and a diaphragm. It includes a quantity converter 108, a diaphragm motor driver 109, an amplitude controller 110, a display element driver 111, and a display element 112.
  • the video signal given from the outside is input to the analysis unit 101 and the amplitude control unit 110.
  • the analyzing unit 101 detects an average value (hereinafter referred to as an average signal level) and a maximum value (hereinafter referred to as a maximum signal level) of an amplitude of a video signal given from the outside for a predetermined time.
  • an average value hereinafter referred to as an average signal level
  • a maximum value hereinafter referred to as a maximum signal level
  • the analysis unit 101 identifies the power value of the lighting power and the amplitude value of the video signal according to the detected maximum signal level, and reduces the amount of light emitted from the lamp according to the detected average signal level. Identify. Furthermore, the analysis unit 101 notifies the power determination unit 102 of the specified power value, notifies the amplitude value to the amplitude control unit 110, and notifies the aperture control unit 107 of the reduction amount.
  • the range of the power value specified by the analysis unit 101 is about 80% to 100% of the rated power of the lamp 104, and the lamp refresh process is not necessary in this range.
  • the power determining unit 102 determines the power value of the lighting power and notifies the lamp driving unit 103 of it.
  • the power determination unit 102 determines the power value notified from the analysis unit 101 as the lighting power. In addition, when a power value setting is input from the outside, the power determination unit 102 determines the set power value as the power value of the lighting power.
  • a state in which the power value setting is input is referred to as a manual mode
  • a state in which the power value setting is not input is referred to as an automatic mode.
  • the manual mode a power value that is 80% or less of the rated power and that requires lamp refresh processing is set.
  • the power determination unit 102 monitors the supply state of the lighting power and detects that the power whose supply power value is lower than a predetermined threshold value continues for a certain time or longer, the power determination unit 102 performs the lamp refresh process to perform the lamp refresh process. Is notified to the lamp driving unit 103 that it is changed to a predetermined value equal to or greater than a predetermined threshold for a predetermined time.
  • the predetermined threshold is a value of about 80% of the rated power.
  • the power determination unit 102 notifies the light amount conversion unit 106 of the power values before and after changing by the lamp refresh process.
  • the lamp driving unit 103 supplies lighting power to the lamp 104 in response to the notification from the power determining unit 102, and the lamp 104 is driven by the lighting power and outputs lamp emitted light.
  • the optical diaphragm 105 transmits the light emitted from the lamp, and the light transmitted through the optical diaphragm 105 illuminates the display element 112.
  • FIG. 2 is a diagram illustrating an example of the configuration of the optical aperture 105.
  • the optical diaphragm 105 includes a diaphragm motor 201, gears 202, 203a, and 203b, and light shielding plates 204a and 204b attached on the rotation shafts of the gears 203a and 203b.
  • the aperture motor 201 rotates according to the control of the aperture motor driving unit 109.
  • the gear 202 rotates as the aperture motor 201 rotates.
  • the gear 202 and the gear 203a and the gear 203a and the gear 203b are engaged with each other.
  • the gears 203a and 203b rotate, and the opening / closing angles of the light shielding plates 204a and 204b change.
  • the amount of light transmitted through the optical diaphragm 105 is changed by changing the opening and closing angles of the light shielding plates 204a and 204b. That is, the transmission amount of the optical aperture 105 is variable.
  • the light amount conversion unit 106 stores the correspondence relationship between the power value of the lighting power and the light amount of the lamp emission light at the power value shown in FIG.
  • the horizontal axis indicates the power value of the lighting power as a ratio to the rated power
  • the vertical axis indicates the ratio of the light emitted from the lamp at each power value to the light emitted from the lamp at the rated power. It is shown.
  • the power value of the lighting power and the light quantity of the emitted light from the lamp are in a proportional relationship.
  • the light amount conversion unit 106 identifies the amount of change in the amount of light emitted from the lamp before and after the change in the power value of the lighting power notified from the power determination unit 102 from the correspondence shown in FIG. Notify
  • the aperture control unit 107 outputs the reduction amount of the lamp emitted light notified from the analysis unit 101 to the aperture amount conversion unit 108. Further, when the amount of change in the amount of light emitted from the lamp is notified from the light amount conversion unit 106, the aperture controller 107 determines the amount of reduction in the amount of light emitted from the lamp so that the amount of light from the image light becomes constant, The aperture amount conversion unit 108 is notified.
  • the aperture amount conversion unit 108 stores a correspondence relationship between the transmission amount of the optical aperture 105 and the rotation position of the aperture motor 201 shown in FIG.
  • the horizontal axis indicates the transmission amount of the optical aperture 105
  • the vertical axis indicates the rotational position of the aperture motor 201 that is the transmission amount.
  • the aperture amount conversion unit 108 determines the rotational position of the aperture motor 201 corresponding to the transmission amount of the optical aperture 105 in which the reduction amount of the light emitted from the lamp by the optical aperture 105 is the reduction amount notified from the aperture control unit 107. It specifies with reference to the correspondence shown in FIG. 4, and notifies it to the aperture motor drive unit 109.
  • the optical aperture 105 cannot completely block the emitted light from the lamp even when the rotational position of the aperture motor 201 is 0%, and transmits a certain amount of the emitted light from the lamp. Therefore, depending on the reduction amount of the light emitted from the lamp determined by the diaphragm control unit 107, the optical diaphragm 105 alone may not be able to reduce the amount sufficiently. In this case, the aperture control unit 107 determines an amplitude value of the video signal such that the amount of light that cannot be reduced by the optical aperture 105 is reduced by the display element 112 and notifies the amplitude control unit 110 of the amplitude value.
  • the aperture control unit 107 stores, for example, the correspondence relationship between the reduction amount of the lamp emission light, the transmission amount of the optical aperture 105, and the amplitude value of the video signal shown in FIGS. 5A and 5B. In FIGS. 5A and 5B, it is assumed that the optical aperture 105 cannot reduce the light amount of the lamp emission light to less than A%.
  • the aperture control unit 107 controls only the transmission amount of the optical aperture 105 as shown in FIG. 5A.
  • the diaphragm control unit 107 sets the transmission amount of the optical diaphragm 105 to A% and the video signal corresponding to the reduction amount of the lamp emission light quantity.
  • the amplitude value is determined with reference to the correspondence shown in FIG. 5B.
  • the amplitude control unit 110 corrects the amplitude value of the video signal to the amplitude value notified from the analysis unit 101. Furthermore, when the amplitude value is notified from the aperture control unit 107, the amplitude control unit 110 corrects the amplitude value of the video signal again to the amplitude value. Then, the amplitude control unit 110 outputs the video signal whose amplitude value is corrected to the display element driving unit 111.
  • the display element driving unit 111 inputs the video signal output from the amplitude control unit 110 to the display element 112, and the display element 112 modulates the lamp illumination light according to the amplitude of the video signal and emits it as video light.
  • the light emitted from the lamp is greatly attenuated as the amplitude value of the video signal is small. That is, the image light becomes darker as the amplitude of the image signal is smaller.
  • the analysis unit 101 detects the average signal level and the maximum signal level of the video signal.
  • the analysis unit 101 stores a correspondence relationship between the maximum signal level shown in FIGS. 6A and 6B, the power value of the lighting power, and the amplitude value of the video signal, and the lighting power corresponding to the detected maximum signal level is stored.
  • the power value and the amplitude value of the video signal are specified with reference to the correspondence relationship shown in FIGS. 6A and 6B.
  • the maximum signal level is the maximum
  • the power value of the lighting power is the maximum
  • the amplitude of the video signal is a standard value that is not enlarged or reduced. Based on this state, the analysis unit 101 reduces the power value of the lighting power and increases the amplitude value of the video signal and suppresses the change in the brightness of the projected video when the maximum signal level decreases.
  • the analysis unit 101 identifies the power value of the lighting power within a range of about 80% to 100% of the rated power.
  • the analysis unit 101 stores a correspondence relationship between the average signal level and the transmission amount of the optical aperture 105 shown in FIG. 7, and the transmission amount of the optical aperture 105 corresponding to the detected average signal level is shown in FIG.
  • the amount of reduction of the light emitted from the lamp is specified from the transmission amount of the specified optical aperture 105.
  • the analysis unit 101 decreases the transmission amount of the optical aperture 105 in a dark state with a low average signal level, that is, increases the reduction amount of the light emitted from the lamp.
  • the reduction amount of the light emitted from the lamp increases the reduction amount of the light emitted from the lamp.
  • the brightness of the projected image decreases, the average signal level is high, and the relative contrast with the bright state can be improved.
  • the analysis unit 101 When the power value of the lighting power, the amplitude value of the video signal, and the transmission amount of the optical aperture 105 are specified, the analysis unit 101 notifies the power determination unit 102 of the power value, and notifies the amplitude control unit 110 of the amplitude value. The transmission amount is notified to the aperture control unit 107.
  • the power determination unit 102 causes the lamp driving unit 102 to supply the lighting power of the power value notified from the analysis unit 101.
  • the aperture control unit 107 notifies the transmission amount notified from the analysis unit 101 to the aperture amount conversion unit 108, and the aperture amount conversion unit 108 specifies the rotation position of the aperture motor 201 corresponding to the transmission amount, This is notified to the aperture motor drive unit 109.
  • the aperture motor drive unit 109 controls the transmission amount of the optical aperture 105 by rotating the aperture motor 201 to the rotation position notified from the aperture amount conversion unit 108.
  • the amplitude control unit 110 corrects the amplitude value of the video signal to the amplitude value notified from the analysis unit 101 and outputs it to the display element driving unit 111.
  • the display element driving unit 111 outputs the video signal to the display element 112. Then, the display element 112 is driven.
  • the analysis unit 101 identifies the power value of the lighting power and the amplitude value of the video signal in which the image light having the same brightness is projected with less power consumption, and the contrast of the projected video is improved.
  • the transmission amount of the optical aperture 105 is specified. Therefore, by setting the power value of the lighting power, the amplitude value of the video signal, and the transmission amount of the optical aperture 105 specified by the analysis unit 101, it is possible to reduce power consumption and improve the contrast of the projected video. .
  • the power determination unit 102 causes the lamp driving unit 103 to supply the lighting power of the set power value.
  • the power value set in the manual mode is lower than the predetermined threshold value.
  • the power setting unit 102 detects that the supplied power value has continued for a certain time or longer than the predetermined threshold value, the power setting unit 102 sets the lighting power value to a predetermined value higher than the predetermined threshold value in order to perform lamp refresh processing.
  • the lamp driving unit 103 is notified of the change for a predetermined time.
  • the predetermined value higher than the predetermined threshold is electric power at which the halogen cycle normally occurs.
  • the power determination unit 102 notifies the light amount conversion unit 106 of the power values before and after changing by the lamp refresh process.
  • the light amount conversion unit 106 identifies the amount of change in the amount of light emitted from the lamp before and after the change in the power value of the lighting power notified from the power determination unit 102 and notifies the aperture control unit 107 of the change.
  • the aperture controller 107 determines the amount of light emitted from the lamp according to the amount of change in the amount of light emitted from the lamp notified from the light amount converter 106 and the amount of reduction in the amount of light emitted from the lamp notified from the analyzer 101. The reduction amount is determined and notified to the aperture amount conversion unit 108.
  • the aperture control unit 107 performs arithmetic processing to determine the amount of reduction in the amount of light emitted from the lamp.
  • the aperture amount conversion unit 108 and the aperture motor drive unit 109 perform the same operation as in the automatic mode, and the transmission amount of the optical aperture 105 is controlled. As described above, even when the power value of the lighting power is changed by the lamp refresh process, the change in the brightness of the image light can be suppressed by controlling the transmission amount of the optical aperture 105.
  • the analysis unit 101 specifies that the emitted light from the lamp is greatly reduced, that is, the transmission amount of the optical aperture 105 is reduced.
  • the optical diaphragm 105 alone may not be able to reduce the increase in the amount of light emitted from the lamp.
  • the aperture control unit 107 notifies the aperture amount conversion unit 108 that the transmission amount of the optical aperture 105 is minimized, and the amount of light that cannot be reduced by the optical aperture 105 is reduced by the display element 112.
  • the amplitude value of the video signal is determined with reference to the correspondence shown in FIG. 5B and notified to the amplitude control unit 110.
  • the aperture amount conversion unit 108 In response to the notification from the aperture control unit 107, the aperture amount conversion unit 108 notifies the aperture motor driving unit 109 of the rotational position of the aperture motor 201 at which the transmission amount of the optical aperture 105 is minimized.
  • the amplitude control unit 110 corrects the amplitude value of the video signal to the amplitude value notified from the aperture control unit 107 and outputs it to the display element driving unit 111.
  • the amplitude value of the video signal is controlled by controlling the amplitude value of the video signal. Changes in brightness can be suppressed.
  • FIG. 8 is a diagram comparing the operations of the projection display device 100 in the automatic mode and the manual mode.
  • the analysis unit 101 specifies the power value of the lighting power in the range of 80% to 100% of the rated power, and the lighting power of the specified power value is Supplied to the lamp 104.
  • the power value of the lighting power is in the range of about 80% to 100% of the rated power, the lamp refresh process is not necessary.
  • the amplitude value of the video signal is corrected, so that the change in the brightness of the video light is suppressed even if the power value is reduced.
  • a power value lower than a predetermined threshold for example, lower than 80% of the rated power, for example, a power value of 25% of the rated power is set. For this reason, the brightness of the image light is darker than in the normal mode. Further, since the power value of the lighting power is lower than a predetermined threshold value, the lamp refresh process is necessary.
  • the amount of light emitted from the lamp increases and the brightness of the image light changes.
  • a change in the brightness of the image light is suppressed by reducing the increase in the amount of light emitted from the lamp by controlling the transmission amount of the optical aperture 105.
  • the increase in the amount of light emitted from the lamp cannot be reduced by the optical diaphragm 105 alone, the change in the brightness of the image light is suppressed by correcting the amplitude value of the image signal.
  • the projection display device 100 specifies the power value of the lighting power, the transmission amount of the optical aperture 105, and the amplitude value of the video signal in accordance with the video signal, and the specification.
  • the lighting power of the power thus supplied is supplied to the lamp 104, the optical diaphragm 105 is controlled according to the specified transmission amount, and the amplitude value of the video signal is corrected.
  • the projection display device 100 increases the power value of the lighting power when the lighting power having a power value lower than the predetermined threshold is supplied to the lamp 104 for a predetermined time or longer.
  • the transmission amount of the optical aperture 105 is controlled so that the light quantity of the image light is constant before and after the change of the power value.
  • the projection display device 100 controls the amplitude value of the video signal when the amount of the video light cannot be made constant only by controlling the transmission amount of the optical aperture 105.
  • the present invention is not limited to this. .
  • a histogram of the maximum value and the average value of the amplitude of the video signal may be generated, and the lighting power may be specified according to the generated histogram.
  • the maximum signal level is detected only in a very limited range (for example, about several pixels) in the video shown in the video signal, the influence of noise or the like is considered. Even if such a detection result is used, the power value or the like cannot be appropriately specified. Therefore, for example, in the video shown in the video signal, at least about 10% of pixels may have the same detection value, and the largest amplitude value may be set as the maximum signal level.
  • the gradation of the video signal may be detected, and the gradation with high detection frequency may be set as the average signal level.
  • the lamp 104, the optical aperture 105, and the display element 112 have been described using an example provided in this order.
  • the present invention is not limited to this.
  • the lamp 104, the display element 112, and the optical aperture 105 may be provided in this order.
  • a liquid crystal display element a liquid crystal display element, a digital micromirror device (DMD element), or the like can be used.
  • DMD element digital micromirror device

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  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Projection Apparatus (AREA)
  • Transforming Electric Information Into Light Information (AREA)

Abstract

La présente invention concerne une visionneuse du type à projection qui comprend une lampe ; une unité de commande de lampe qui fournit l'énergie d'éclairage à la lampe ; une ouverture optique dans laquelle, lorsque la lumière émise par la lampe est transmise à travers l'ouverture optique, la quantité de transmission est variable ; une unité d'analyse qui spécifie la valeur de la puissance d'éclairage et la quantité de transmission de l'ouverture optique en réponse à un signal vidéo, et qui émet un premier signal représentant la valeur de puissance spécifiée et un deuxième signal représentant la quantité de transmission ; une unité de détermination de puissance qui fournit une puissance d'éclairage présentant une valeur de puissance représentée par le premier signal, qui fournit une puissance d'éclairage représentée par le paramètre de valeur de puissance lorsque celui-ci a été saisi en externe, à l'unité de commande de lampe, qui modifie la valeur de puissance de la puissance d'éclairage à une valeur prescrite si la puissance dont la valeur de puissance d'alimentation est inférieure à la valeur seuil prescrite dure plus longtemps qu'une certaine quantité de temps, et qui émet un troisième signal représentant les valeurs de puissance avant et après la modification ; et une unité de commande d'ouverture qui commande l'ouverture optique en réponse au deuxième signal, et qui commande l'ouverture optique par la spécification de la quantité de transmission à laquelle la quantité de lumière vidéo est constante avant et après la modification de la valeur de puissance représentée par le troisième signal lorsque ce dernier a été entré.
PCT/JP2010/070038 2010-11-10 2010-11-10 Visionneuse du type à projection et son procédé de commande WO2012063336A1 (fr)

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JP2012542758A JP5605864B2 (ja) 2010-11-10 2010-11-10 投射型表示装置およびその制御方法
PCT/JP2010/070038 WO2012063336A1 (fr) 2010-11-10 2010-11-10 Visionneuse du type à projection et son procédé de commande

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2013057930A (ja) * 2011-08-18 2013-03-28 Seiko Epson Corp 投射型表示装置及びその制御方法
JP2019117307A (ja) * 2017-12-27 2019-07-18 キヤノン株式会社 画像投射装置

Citations (5)

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