WO2015136616A1 - Image display device and method for displaying image - Google Patents

Image display device and method for displaying image Download PDF

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Publication number
WO2015136616A1
WO2015136616A1 PCT/JP2014/056283 JP2014056283W WO2015136616A1 WO 2015136616 A1 WO2015136616 A1 WO 2015136616A1 JP 2014056283 W JP2014056283 W JP 2014056283W WO 2015136616 A1 WO2015136616 A1 WO 2015136616A1
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WO
WIPO (PCT)
Prior art keywords
light
white
color
video signal
component
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Application number
PCT/JP2014/056283
Other languages
French (fr)
Japanese (ja)
Inventor
幸則 潮屋
Original Assignee
Ｎｅｃディスプレイソリューションズ株式会社
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Priority to PCT/JP2014/056283 priority Critical patent/WO2015136616A1/en
Publication of WO2015136616A1 publication Critical patent/WO2015136616A1/en

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    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G5/00—Control arrangements or circuits for visual indicators common to cathode-ray tube indicators and other visual indicators
    • G09G5/02—Control arrangements or circuits for visual indicators common to cathode-ray tube indicators and other visual indicators characterised by the way in which colour is displayed
    • G09G5/022—Control arrangements or circuits for visual indicators common to cathode-ray tube indicators and other visual indicators characterised by the way in which colour is displayed using memory planes
    • 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
    • G03B21/206—Control of light source other than position or intensity
    • 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
    • G03B33/08—Sequential recording or projection
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/001—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes using specific devices not provided for in groups G09G3/02 - G09G3/36, e.g. using an intermediate record carrier such as a film slide; Projection systems; Display of non-alphanumerical information, solely or in combination with alphanumerical information, e.g. digital display on projected diapositive as background
    • 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
    • H04N9/3111—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM] using two-dimensional electronic spatial light modulators for displaying the colours sequentially, e.g. by using sequentially activated light sources
    • H04N9/3114—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM] using two-dimensional electronic spatial light modulators for displaying the colours sequentially, e.g. by using sequentially activated light sources by using a sequential colour filter producing one colour at a time
    • 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
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/02—Improving the quality of display appearance
    • G09G2320/0242—Compensation of deficiencies in the appearance of colours
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/06—Adjustment of display parameters
    • G09G2320/0626—Adjustment of display parameters for control of overall brightness
    • G09G2320/0646—Modulation of illumination source brightness and image signal correlated to each other
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2330/00—Aspects of power supply; Aspects of display protection and defect management
    • G09G2330/02—Details of power systems and of start or stop of display operation
    • G09G2330/021—Power management, e.g. power saving
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
    • G09G3/3433—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using light modulating elements actuated by an electric field and being other than liquid crystal devices and electrochromic devices
    • G09G3/346—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using light modulating elements actuated by an electric field and being other than liquid crystal devices and electrochromic devices based on modulation of the reflection angle, e.g. micromirrors

Definitions

  • the present invention relates to an image display apparatus and an image display method, for example, an image display apparatus and an image display method for displaying an image by irradiating light to a light modulation display element driven in accordance with a video signal.
  • an image display device including a light modulation display element such as a DMD (Digital Micromirror Device), a color wheel including red, green and blue color filters, and a light source is known.
  • a light modulation display element such as a DMD (Digital Micromirror Device)
  • a color wheel including red, green and blue color filters
  • a light source is known.
  • the color wheel includes red, green, and blue color filters, sequentially extracts red, green, and blue light from the light of the light source, and extracts the extracted red, green, and blue light,
  • the light modulation display element is sequentially irradiated.
  • the light modulation display element is based on a red component signal, a green component signal, and a blue component signal among the video signals while the red light, the green light, and the blue light are irradiated. And the red, green, and blue lights are respectively modulated to generate a red component image, a green component image, and a blue component image.
  • the light modulation display element displays an image corresponding to a video signal by displaying a red component image, a green component image, and a blue component image in a superimposed manner on a display area such as a screen.
  • Patent Document 1 describes an image display device having a color wheel provided with a white color filter in addition to red, green and blue color filters in order to increase the brightness of a display image.
  • the image display device described in Patent Document 1 includes red, green, and blue light from the light modulation display element in an area in which white is specified by a video signal (hereinafter referred to as “white display area”) in the display area.
  • white display area a video signal
  • white light from the light modulation display element is irradiated. For this reason, the amount of light applied to the white display area is increased, and the display image is brightened.
  • the image display device described in Patent Document 1 detects the ratio of the white component in the image indicated by the video signal, and emits white light when the ratio of the white component is low and the display image is dark. Control is performed to reduce the light amount of the light source during the period, and to increase the light amount of the light source during the period in which red, green, and blue light is irradiated. With this control, when the ratio of the white component is low, an area other than the white display area (hereinafter referred to as “non-white display area”) in the display area becomes bright, and the brightness of the entire image is improved.
  • FIG. 1 is a diagram showing the power ratio of the light source corresponding to the light of each color when the ratio of the white component is a predetermined value or more.
  • the power ratio is a ratio with respect to a predetermined reference power.
  • FIG. 2 is a diagram showing the power ratio of the light source corresponding to the light of each color when the ratio of the white component is less than a predetermined value.
  • the light source increases in light amount as the power increases, and that the light source is driven by one of the power ratios of the light source corresponding to the light of each color shown in FIG. 1 or FIG.
  • the light amount of the light source when the ratio of the white component is less than a predetermined value (FIG. 2) is equal to or greater than the predetermined value.
  • the amount of light is smaller than that of the light source.
  • the light amount of the light source when the ratio of the white component is less than a predetermined value (FIG. 2)
  • the light quantity of the light source of 1) is larger. This is because when the light amount of the light source is reduced during the period of white light irradiation, the brightness of the entire image is reduced. To compensate for this, the period of red, green, and blue light irradiation Then, the light quantity of the light source is increased.
  • An object of the present invention is to provide an image display device and an image display method capable of solving the above-described problems.
  • the image display device of the present invention is A light source that outputs light; Extraction means for sequentially extracting white light and light of a color different from white from the light output from the light source; Detecting means for detecting a ratio of a white component in an image represented by the input video signal based on the input video signal; In the situation where the extraction means extracts light of a color different from the white, the light quantity of the light source is not increased, and in the situation where the extraction means extracts the white light, the white component detected by the detection means Control means for controlling the light quantity of the light source according to the ratio; The light of each color sequentially extracted by the extracting means is modulated according to a signal of a component corresponding to the color of the light in the input video signal, and the modulated light of each color is superimposed on the display surface. Light modulation means for displaying an image corresponding to the input video signal.
  • the image display method of the present invention includes: An image display method performed by an image display device, From the light emitted from the light source, white light and light of a different color from white are sequentially extracted. Based on the input video signal, the ratio of the white component in the image represented by the input video signal is detected, In a situation where light of a color different from the white is extracted, the light quantity of the light source is not increased, and in a situation where the white light is extracted, the light quantity of the light source is controlled according to the ratio of the white component, The sequentially extracted light of each color is modulated according to a signal of a component corresponding to the color of the light in the input video signal, and the modulated light of each color is superimposed on a display surface to form the input video signal. The corresponding image is displayed.
  • FIG. 5 is a diagram illustrating an example of a ratio of white components detected by a color component extraction unit.
  • FIG. 5 is a diagram illustrating an example of a ratio of white components detected by a color component extraction unit.
  • FIG. 3 is a diagram showing a projector 100 according to an embodiment of the present invention.
  • the projector 100 is an example of an image display device.
  • the projector 100 includes a lamp 1, a color wheel 2, a projector control unit 3, a color component extraction unit 4, a control unit 5, a color wheel drive unit 6, a DMD drive unit 7, a DMD 8, and an optical system 9. And including.
  • the control unit 5 includes a lamp control unit 51 and a lamp driving unit 52.
  • the lamp 1 is an example of a light source.
  • the lamp 1 outputs light.
  • the lamp 1 has a characteristic that the amount of light increases as the supplied power increases.
  • the color wheel 2 is an example of extraction means.
  • the color wheel 2 includes white, red, green and blue color filters 2a to 2d.
  • the color wheel 2 sequentially extracts white light, red light, green light, and blue light from the light output from the lamp 1 by passing the light from the lamp 1 while rotating.
  • the projector control unit 3 controls the overall operation of the projector 100 and processes the input video signal (input video signal). In the present embodiment, the projector control unit 3 generates a white component video signal, a red component video signal, a green component video signal, and a blue component video signal from the video signal.
  • the projector control unit 3 sequentially outputs a white component video signal, a red component video signal, a green component video signal, and a blue component video signal, a color wheel driving unit 6, a lamp driving unit 52, Output to the DMD drive unit 7. Further, the projector control unit 3 outputs a white component video signal to the color component extraction unit 4.
  • the color component extraction unit 4 is an example of a detection unit.
  • the color component extraction unit 4 detects the ratio of the white component in the image represented by the video signal based on the video signal of the white component.
  • the control unit 5 is an example of a control means.
  • the control unit 5 controls the light amount of the lamp 1 in a situation where the color wheel 2 extracts white light according to the ratio of the white component detected by the color component extraction unit 4. Further, the control unit 5 maintains the light amount of the lamp 1 without increasing it in a situation where the color wheel 2 extracts red light, green light, and blue light, respectively.
  • the lamp control unit 51 calculates the power of the lamp 1 in a situation where the color wheel 2 extracts white light based on the ratio of the white component. In addition, the lamp controller 51 sets the light amount of the lamp 1 to a constant value when the color wheel 2 extracts red light, green light, and blue light, respectively, regardless of the ratio of the white component.
  • the lamp control unit 51 uses the power of the lamp 1 when the color wheel 2 extracts white light, and the white component ratio is larger than the threshold.
  • the power of the lamp 1 is set to be smaller than that in a situation where the color wheel 2 extracts white light.
  • the threshold value is registered in advance in the lamp control unit 51.
  • the lamp control unit 51 generates a light amount control signal indicating the power of the lamp 1 when the color wheel 2 extracts white, red, green, and blue light, and outputs the light amount control signal to the lamp driving unit 52. .
  • the lamp driving unit 52 follows the light amount control signal from the lamp control unit 51, the white component video signal, the red component video signal, the green component video signal, and the blue component video signal from the projector control unit 3, respectively.
  • the power supplied to the lamp 1, that is, the light quantity of the lamp 1 is controlled.
  • the color wheel drive unit 6 extracts the white light from the light of the lamp 1 while receiving the white component video signal, and the color wheel 2 is the lamp while receiving the red component video signal.
  • the red light is extracted from the light 1 and the color wheel 2 extracts the green light from the light of the lamp 1 while the green component video signal is received, and the color while the blue component video signal is received.
  • the rotation of the color wheel 2 is controlled so that the wheel 2 extracts blue light from the light from the lamp 1.
  • the DMD driving unit 7 drives the DMD 8 according to the white component video signal, and when receiving the red component video signal, the DMD driving unit 7 drives the DMD 8 according to the red component video signal to generate the green component video.
  • the DMD 8 is driven according to the green component video signal, and when the blue component video signal is received, the DMD 8 is driven according to the blue component video signal.
  • the DMD8 is an example of light modulation means.
  • the DMD 8 modulates the light of each color sequentially extracted by the color wheel 2 according to the signal of the component corresponding to the color of the light in the video signal, and the modulated light of each color via the optical system 9.
  • the image corresponding to the video signal is displayed by superimposing it on a display surface such as a screen.
  • the projector control unit 3 Upon receiving the video signal, the projector control unit 3 generates a white component video signal, a red component video signal, a green component video signal, and a blue component video signal from the video signal.
  • the projector control unit 3 outputs the white component video signal to the color component extraction unit 4, and the white component video signal, the red component video signal, the green component video signal, and the blue component video signal
  • the video signals are sequentially output to the color wheel driving unit 6, the lamp driving unit 52, and the DMD driving unit 7.
  • the color component extraction unit 4 detects the ratio of the white component in the image represented by the video signal based on the white component video signal.
  • the color component extraction unit 4 calculates the ratio of the number of white pixels in the image represented by the white component video signal to the total number of pixels of the image represented by the white component video signal. Is calculated as a ratio (video ratio).
  • 4 and 5 are diagrams showing examples of the ratio of the white component detected by the color component extraction unit 4.
  • FIG. 4 shows a case where the ratio of the white component is larger than the threshold value
  • FIG. 5 shows a case where the ratio of the white component is smaller than the threshold value.
  • the color component extraction unit 4 outputs the calculation result of the white component ratio to the lamp control unit 51.
  • the lamp control unit 51 compares the calculation result of the white component ratio with a threshold value.
  • the lamp control unit 51 sets the power ratio of the lamp 1 at the time of white light extraction to 128%, and other colors of light (red , Green and blue light), the power ratio of the lamp 1 during extraction is set to 85%.
  • the lamp control unit 51 generates a light amount control signal that sets the power ratio of the lamp 1 at the time of white light extraction to 128% and the power ratio of the lamp 1 at the time of light extraction of other colors to 85%, and the light amount thereof.
  • a control signal is output to the lamp driver 52.
  • the lamp driving unit 52 supplies power (lamp 1) to the lamp 1 according to the light amount control signal, the white component video signal, the red component video signal, the green component video signal, and the blue component video signal. The amount of light).
  • FIG. 6 shows the operation of the lamp 1 when a light amount control signal is received in which the power ratio of the lamp 1 at the time of white light extraction is 128% and the power ratio of the lamp 1 at the time of light extraction of other colors is 85%. It is a figure.
  • the power ratio of the lamp 1 when the color wheel 2 extracts white light is 128%, and the power ratio of the lamp 1 when the color wheel 2 extracts light of other colors is 85%. %.
  • the entire projected image can be brightened by increasing the power of the lamp 1 when the color wheel 2 is extracting white light.
  • the lamp control unit 51 sets the power ratio of the lamp 1 at the time of white light extraction to 85%, and lights of other colors. (Red, green, blue light) The power ratio of the lamp 1 at the time of extraction is set to 85%.
  • the lamp control unit 51 generates a light amount control signal that sets the power ratio of the lamp 1 during white light extraction to 85% and the power ratio of the lamp 1 during light extraction of other colors to 85%.
  • a control signal is output to the lamp driver 52.
  • the lamp driving unit 52 supplies power (lamp 1) to the lamp 1 according to the light amount control signal, the white component video signal, the red component video signal, the green component video signal, and the blue component video signal. The amount of light).
  • FIG. 7 shows the operation of the lamp 1 when a light amount control signal is received in which the power ratio of the lamp 1 when extracting white light is 85% and the power ratio of the lamp 1 when extracting light of other colors is 85%. It is a figure.
  • the power ratio of the lamp 1 when the color wheel 2 extracts white light is 85%, and the power ratio of the lamp 1 when the color wheel 2 extracts light of other colors is 85%. %.
  • the color wheel 2 when the white component is small, the color wheel 2 extracts white light without increasing the power of the lamp 1 when the color wheel 2 is extracting red, green, and blue light.
  • the power of the lamp 1 is lowered when the lamp is on, and the average power of the lamp 1 is lowered.
  • the lamp control unit 51 When the calculation result of the white component ratio is the same as the threshold value, the lamp control unit 51 operates in the same manner as when the calculation result of the white component ratio is larger than the threshold value. When the calculation result of the white component ratio is the same as the threshold value, the lamp control unit 51 does not operate as in the case where the calculation result of the white component ratio is larger than the threshold value, and calculates the white component ratio. The operation may be the same as when the result is smaller than the threshold value.
  • the color component extraction unit 4 detects the ratio of the white component in the image represented by the video signal based on the video signal.
  • the control unit 5 controls the light amount of the lamp 1 in accordance with the ratio of the white component detected by the color component extraction unit 4.
  • the DMD 8 modulates the light of each color sequentially extracted by the color wheel 2 according to the signal of the component corresponding to the color of the light in the video signal, and superimposes the modulated light of each color on the display surface. An image corresponding to the video signal is displayed.
  • the light intensity of the lamp 1 is reduced when the color wheel 2 extracts white light
  • the light intensity of the lamp 1 cannot be increased when the color wheel 2 extracts light of a color different from white. Therefore, the average power in the lamp 1 can be reduced, and the power consumption can be reduced.
  • an image display device including the lamp 1, the color wheel 2, the color component extraction unit 4, the control unit 5, and the DMD 8.
  • control unit 5 maintains the light amount of the lamp 1 at a constant value in a situation where the color wheel 2 extracts red, green, and blue light.
  • control unit 5 when the ratio of the white component becomes smaller than the threshold value, the control unit 5 reduces the amount of light from the lamp 1 when the color wheel 2 extracts white light.
  • the light quantity of the lamp 1 is controlled using one threshold value, but the control unit 5 is, for example, a data table showing a plurality of threshold values and the light quantity of the lamp 1 corresponding to each threshold value.
  • the control unit 5 is, for example, a data table showing a plurality of threshold values and the light quantity of the lamp 1 corresponding to each threshold value.
  • red, green, and blue are used as colors different from white.
  • colors different from white are not limited to red, green, and blue, and may be cyan, magenta, and yellow, for example.
  • the control unit 5 determines the amount of light from the lamp 1 when the color wheel 2 extracts white light, and the color wheel 2 is red, green, and blue.
  • the amount of light from the lamp 1 in the situation where the color wheel 2 extracts white light when the ratio of the white component is smaller than the threshold is white. It should be less than the amount of light from the lamp 1 when the color wheel 2 extracts white light when the ratio of the components is larger than the threshold.
  • control unit 5 uses the same amount of light from the lamp 1 when the color wheel 2 extracts red, green, and blue light, but the lamp when the color wheel 2 extracts red light.
  • the amount of light from 1, the amount of light from the lamp 1 when green light is extracted, and the amount of light from the lamp 1 when blue light is extracted may be set differently.
  • the DMD is used as an example of the light modulation means, but the light modulation means is not limited to the DMD and can be changed as appropriate.
  • a liquid crystal panel may be used.
  • the power of the lamp 1 corresponding to each color indicated in the light amount control signal is not limited to the above and can be changed as appropriate.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Computer Hardware Design (AREA)
  • Theoretical Computer Science (AREA)
  • Projection Apparatus (AREA)

Abstract

The purpose of the present invention is to reduce the power consumption of a light source in an image display device provided with a light modulation element, a color wheel, and a light source. An image display device (100) comprises: a light source (1) for emitting light; an extraction means (2) for sequentially extracting white color light and non-white color light from the light emitted from the light source (1); a detection means (4) for detecting the ratio of a white color component in an image represented by an input video signal on the basis of the input video signal; a control means (5) which does not increase the light quantity of the light source if the extraction means (2) extracts non-white color light, and controls the light quantity of the light source (1) in accordance with the ratio of white color component detected by the detection means (4) if the extraction means (2) extracts white color light; and a light modulation means (8) which modulates light of each color sequentially extracted by the extraction means (2) in accordance with a signal corresponding to the light color component in the input video signal, and displays an image in accordance with the input video signal by superimposing modulated light of each color on a display surface.

Description

画像表示装置および画像表示方法Image display device and image display method
　本発明は、画像表示装置および画像表示方法に関し、例えば、映像信号に応じて駆動する光変調表示素子に光を照射して画像を表示する画像表示装置および画像表示方法に関する。 The present invention relates to an image display apparatus and an image display method, for example, an image display apparatus and an image display method for displaying an image by irradiating light to a light modulation display element driven in accordance with a video signal.
　近年、DMD（Digital  Micromirror　Device）等の光変調表示素子と、赤色、緑色および青色のカラーフィルタを備えたカラーホイールと、光源と、を備えた画像表示装置が知られている。 In recent years, an image display device including a light modulation display element such as a DMD (Digital Micromirror Device), a color wheel including red, green and blue color filters, and a light source is known.
　この画像表示装置では、カラーホイールは、赤色、緑色および青色のカラーフィルタを備え、光源の光から、赤色、緑色、青色の光を順次抽出し、抽出された赤色、緑色、青色の光を、光変調表示素子に順次照射する。 In this image display device, the color wheel includes red, green, and blue color filters, sequentially extracts red, green, and blue light from the light of the light source, and extracts the extracted red, green, and blue light, The light modulation display element is sequentially irradiated.
　光変調表示素子は、赤色の光、緑色の光、青色の光が照射されている間、それぞれ、映像信号のうち、赤色の成分の信号、緑色の成分の信号、青色の成分の信号に基づいて駆動して赤色、緑色、青色の光をそれぞれ変調し、赤色成分画像、緑色成分画像、青色成分画像を生成する。光変調表示素子は、赤色成分画像、緑色成分画像、青色成分画像を、例えばスクリーン等の表示領域に重ねて表示することによって、映像信号に応じた画像を表示する。 The light modulation display element is based on a red component signal, a green component signal, and a blue component signal among the video signals while the red light, the green light, and the blue light are irradiated. And the red, green, and blue lights are respectively modulated to generate a red component image, a green component image, and a blue component image. The light modulation display element displays an image corresponding to a video signal by displaying a red component image, a green component image, and a blue component image in a superimposed manner on a display area such as a screen.
　特許文献１には、表示画像の輝度を高くするために、赤色、緑色および青色のカラーフィルタに加えて白色のカラーフィルタを備えたカラーホイールを有する画像表示装置が記載されている。 Patent Document 1 describes an image display device having a color wheel provided with a white color filter in addition to red, green and blue color filters in order to increase the brightness of a display image.
　特許文献１に記載の画像表示装置は、表示領域のうち、映像信号にて白色が指定された領域（以下「白表示領域」と称する）には、光変調表示素子からの赤色、緑色および青色の各光に加えて、光変調表示素子からの白色の光を照射する。このため、白表示領域に照射される光量が増え、表示画像の高輝度化が実現される。 The image display device described in Patent Document 1 includes red, green, and blue light from the light modulation display element in an area in which white is specified by a video signal (hereinafter referred to as “white display area”) in the display area. In addition to each of these lights, white light from the light modulation display element is irradiated. For this reason, the amount of light applied to the white display area is increased, and the display image is brightened.
　また、特許文献１に記載の画像表示装置は、映像信号にて示される画像内での白色成分の比率を検出し、白色成分の比率が低く表示画像が暗い場合には、白色の光が照射される期間では光源の光量を下げ、赤色、緑色、青色の光が照射される期間では光源の光量を上げる制御を実施する。この制御によって、白色成分の比率が低い場合、表示領域のうち白色表示領域以外の領域（以下「白以外表示領域」と称する）が明るくなり、画像全体の明るさが向上する。 The image display device described in Patent Document 1 detects the ratio of the white component in the image indicated by the video signal, and emits white light when the ratio of the white component is low and the display image is dark. Control is performed to reduce the light amount of the light source during the period, and to increase the light amount of the light source during the period in which red, green, and blue light is irradiated. With this control, when the ratio of the white component is low, an area other than the white display area (hereinafter referred to as “non-white display area”) in the display area becomes bright, and the brightness of the entire image is improved.
　特許文献１に記載の発明を用いた光量の制御について図１および図２を参照して説明する。 The control of the amount of light using the invention described in Patent Document 1 will be described with reference to FIGS.
　図１は、白色成分の比率が所定値以上である場合での各色の光に対応する光源の電力比率を示した図である。なお、電力比率は、予め定められた基準電力に対する比率である。 FIG. 1 is a diagram showing the power ratio of the light source corresponding to the light of each color when the ratio of the white component is a predetermined value or more. The power ratio is a ratio with respect to a predetermined reference power.
　図２は、白色成分の比率が所定値未満である場合での各色の光に対応する光源の電力比率を示した図である。 FIG. 2 is a diagram showing the power ratio of the light source corresponding to the light of each color when the ratio of the white component is less than a predetermined value.
　なお、光源は、電力が大きくなるほど光量が増えるものとし、図１または図２に示した各色の光に対応する光源の電力比率のいずれかにより光源を駆動するものとして説明する。 It is assumed that the light source increases in light amount as the power increases, and that the light source is driven by one of the power ratios of the light source corresponding to the light of each color shown in FIG. 1 or FIG.
　図１および図２を参照すると、白色の光が照射される期間では、白色成分の比率が所定値未満である場合（図２）の光源の光量は、白色成分の比率が所定値以上である場合（図１）の光源の光量よりも少なくなる。 Referring to FIG. 1 and FIG. 2, during the period in which white light is irradiated, the light amount of the light source when the ratio of the white component is less than a predetermined value (FIG. 2) is equal to or greater than the predetermined value. In this case (FIG. 1), the amount of light is smaller than that of the light source.
　また、赤色、緑色、青色の光が照射される期間では、白色成分の比率が所定値未満である場合（図２）の光源の光量は、白色成分の比率が所定値以上である場合（図１）の光源の光量よりも多くなる。これは、白色の光が照射される期間で光源の光量を下げた場合には、画像全体として輝度が低下してしまうため、これを補うために赤色、緑色、青色の光が照射される期間では光源の光量を上げている。 In addition, in the period in which red, green, and blue light is irradiated, the light amount of the light source when the ratio of the white component is less than a predetermined value (FIG. 2) The light quantity of the light source of 1) is larger. This is because when the light amount of the light source is reduced during the period of white light irradiation, the brightness of the entire image is reduced. To compensate for this, the period of red, green, and blue light irradiation Then, the light quantity of the light source is increased.
特開２００４－３０１９３２号公報JP 2004-301932 A
　図１および図２を用いて説明した構成の場合、白色の光が照射される期間で光源の光量を下げた場合には、輝度が低下することを防止するために、赤色、緑色、青色の光が照射される期間では光源の光量を上げることが行われる。このため、赤色、緑色、青色の光が照射される期間で光源の光量を上げない場合に比べて、光源の消費電力が大きくなるという課題があった。 In the case of the configuration described with reference to FIGS. 1 and 2, when the light amount of the light source is reduced during the period of white light irradiation, red, green, and blue During the period of light irradiation, the light amount of the light source is increased. For this reason, the subject that the power consumption of a light source becomes large compared with the case where the light quantity of a light source is not raised in the period irradiated with red, green, and blue light occurred.
　本発明の目的は、上記課題を解決可能な画像表示装置および画像表示方法を提供することである。 An object of the present invention is to provide an image display device and an image display method capable of solving the above-described problems.
　本発明の画像表示装置は、
　光を出力する光源と、
　前記光源から出力された光から、白色の光と白色と異なる色の光とを順次抽出する抽出手段と、
　入力映像信号に基づいて、該入力映像信号にて表される画像での白色成分の比率を検出する検出手段と、
　前記抽出手段が前記白色と異なる色の光を抽出する状況では、前記光源の光量を上げず、前記抽出手段が前記白色の光を抽出する状況では、前記検出手段にて検出された白色成分の比率に応じて前記光源の光量を制御する制御手段と、
　前記抽出手段にて順次抽出された各色の光を、前記入力映像信号のうち該光の色に応じた成分の信号に応じて変調し、変調された各色の光を表示面に重ねることで前記入力映像信号に応じた画像を表示する光変調手段と、を含む。 The image display device of the present invention is
A light source that outputs light;
Extraction means for sequentially extracting white light and light of a color different from white from the light output from the light source;
Detecting means for detecting a ratio of a white component in an image represented by the input video signal based on the input video signal;
In the situation where the extraction means extracts light of a color different from the white, the light quantity of the light source is not increased, and in the situation where the extraction means extracts the white light, the white component detected by the detection means Control means for controlling the light quantity of the light source according to the ratio;
The light of each color sequentially extracted by the extracting means is modulated according to a signal of a component corresponding to the color of the light in the input video signal, and the modulated light of each color is superimposed on the display surface. Light modulation means for displaying an image corresponding to the input video signal.
　本発明の画像表示方法は、
　画像表示装置が行う画像表示方法であって、
　光源から照射された光から、白色の光と白色と異なる色の光とを順次抽出し、
　入力映像信号に基づいて、該入力映像信号にて表される画像での白色成分の比率を検出し、
　前記白色と異なる色の光を抽出する状況では、前記光源の光量を上げず、前記白色の光を抽出する状況では、前記白色成分の比率に応じて前記光源の光量を制御し、
　前記順次抽出された各色の光を、前記入力映像信号のうち該光の色に応じた成分の信号に応じて変調し、変調された各色の光を表示面に重ねることで前記入力映像信号に応じた画像を表示する。 The image display method of the present invention includes:
An image display method performed by an image display device,
From the light emitted from the light source, white light and light of a different color from white are sequentially extracted.
Based on the input video signal, the ratio of the white component in the image represented by the input video signal is detected,
In a situation where light of a color different from the white is extracted, the light quantity of the light source is not increased, and in a situation where the white light is extracted, the light quantity of the light source is controlled according to the ratio of the white component,
The sequentially extracted light of each color is modulated according to a signal of a component corresponding to the color of the light in the input video signal, and the modulated light of each color is superimposed on a display surface to form the input video signal. The corresponding image is displayed.
　本発明によれば、画像表示装置の消費電力を少なくすることが可能になる。 According to the present invention, it is possible to reduce the power consumption of the image display device.
白色成分の比率が所定値以上である場合での各色の光に対応する光源の電力比率を示した図である。It is the figure which showed the electric power ratio of the light source corresponding to the light of each color in case the ratio of a white component is more than predetermined value. 白色成分の比率が所定値未満である場合での各色の光に対応する光源の電力比率を示した図である。It is the figure which showed the electric power ratio of the light source corresponding to the light of each color in case the ratio of a white component is less than predetermined value. 本発明の一実施形態のプロジェクター１００を示した図である。1 is a diagram showing a projector 100 according to an embodiment of the present invention. 色成分抽出部４にて検出された白色成分の比率の例を示した図である。FIG. 5 is a diagram illustrating an example of a ratio of white components detected by a color component extraction unit. 色成分抽出部４にて検出された白色成分の比率の例を示した図である。FIG. 5 is a diagram illustrating an example of a ratio of white components detected by a color component extraction unit. 白色光抽出時のランプ１の電力比率を１２８％とし他の色の光抽出時のランプ１の電力比率を８５％とする光量制御信号を受け付けたときのランプ１の動作を示した図である。It is the figure which showed the operation | movement of the lamp | ramp 1 when the light quantity control signal which makes the power ratio of the lamp | ramp 1 at the time of white light extraction 128% and the power ratio of the lamp | ramp 1 at the time of light extraction of another color 85% is received. . 白色光抽出時のランプ１の電力比率を８５％とし他の色の光抽出時のランプ１の電力比率を８５％とする光量制御信号を受け付けたときのランプ１の動作を示した図である。It is the figure which showed the operation | movement of the lamp | ramp 1 when the light quantity control signal which sets the power ratio of the lamp | ramp 1 at the time of white light extraction to 85% and the power ratio of the lamp | ramp 1 at the time of light extraction of another color to 85% is received. .
　以下、本発明の一実施形態について図面を参照して説明する。 Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
　図３は、本発明の一実施形態のプロジェクター１００を示した図である。 FIG. 3 is a diagram showing a projector 100 according to an embodiment of the present invention.
　図３において、プロジェクター１００は、画像表示装置の一例である。プロジェクター１００は、ランプ１と、カラーホイール２と、プロジェクター制御部３と、色成分抽出部４と、制御部５と、カラーホイール駆動部６と、DMD駆動部７と、DMD８と、光学系９と、を含む。制御部５は、ランプ制御部５１と、ランプ駆動部５２と、を含む。 In FIG. 3, the projector 100 is an example of an image display device. The projector 100 includes a lamp 1, a color wheel 2, a projector control unit 3, a color component extraction unit 4, a control unit 5, a color wheel drive unit 6, a DMD drive unit 7, a DMD 8, and an optical system 9. And including. The control unit 5 includes a lamp control unit 51 and a lamp driving unit 52.
　ランプ１は、光源の一例である。ランプ１は、光を出力する。ランプ１は、供給される電力が大きくなるほど光量が多くなる特性を有する。 The lamp 1 is an example of a light source. The lamp 1 outputs light. The lamp 1 has a characteristic that the amount of light increases as the supplied power increases.
　カラーホイール２は、抽出手段の一例である。カラーホイール２は、白色、赤色、緑色および青色のカラーフィルタ２ａ～２ｄを備える。カラーホイール２は、回転しながらランプ１からの光を通過させることにより、ランプ１から出力された光から、白色の光、赤色の光、緑色の光、青色の光を順次抽出する。 The color wheel 2 is an example of extraction means. The color wheel 2 includes white, red, green and blue color filters 2a to 2d. The color wheel 2 sequentially extracts white light, red light, green light, and blue light from the light output from the lamp 1 by passing the light from the lamp 1 while rotating.
　プロジェクター制御部３は、プロジェクター１００全体の動作を制御し、かつ入力された映像信号（入力映像信号）の処理を行う。本実施形態では、プロジェクター制御部３は、映像信号から、白色成分の映像信号と、赤色成分の映像信号と、緑色成分の映像信号と、青色成分の映像信号と、を生成する。 The projector control unit 3 controls the overall operation of the projector 100 and processes the input video signal (input video signal). In the present embodiment, the projector control unit 3 generates a white component video signal, a red component video signal, a green component video signal, and a blue component video signal from the video signal.
　プロジェクター制御部３は、白色成分の映像信号と、赤色成分の映像信号と、緑色成分の映像信号と、青色成分の映像信号とを、順次、カラーホイール駆動部６と、ランプ駆動部５２と、DMD駆動部７に出力する。また、プロジェクター制御部３は、白色成分の映像信号を色成分抽出部４に出力する。 The projector control unit 3 sequentially outputs a white component video signal, a red component video signal, a green component video signal, and a blue component video signal, a color wheel driving unit 6, a lamp driving unit 52, Output to the DMD drive unit 7. Further, the projector control unit 3 outputs a white component video signal to the color component extraction unit 4.
　色成分抽出部４は、検出手段の一例である。色成分抽出部４は、白色成分の映像信号に基づいて、映像信号にて表される画像での白色成分の比率を検出する。 The color component extraction unit 4 is an example of a detection unit. The color component extraction unit 4 detects the ratio of the white component in the image represented by the video signal based on the video signal of the white component.
　制御部５は、制御手段の一例である。制御部５は、色成分抽出部４にて検出された白色成分の比率に応じて、カラーホイール２が白色の光を抽出する状況でのランプ１の光量を制御する。また、制御部５は、カラーホイール２が赤色の光、緑色の光、青色の光を各々抽出する状況ではランプ１の光量を上げることなく維持する。 The control unit 5 is an example of a control means. The control unit 5 controls the light amount of the lamp 1 in a situation where the color wheel 2 extracts white light according to the ratio of the white component detected by the color component extraction unit 4. Further, the control unit 5 maintains the light amount of the lamp 1 without increasing it in a situation where the color wheel 2 extracts red light, green light, and blue light, respectively.
　ランプ制御部５１は、白色成分の比率に基づいて、カラーホイール２が白色の光を抽出する状況でのランプ１の電力を算出する。また、ランプ制御部５１は、白色成分の比率にかかわらず、カラーホイール２が赤色の光、緑色の光、青色の光を各々抽出する状況でのランプ１の光量を一定値に設定する。 The lamp control unit 51 calculates the power of the lamp 1 in a situation where the color wheel 2 extracts white light based on the ratio of the white component. In addition, the lamp controller 51 sets the light amount of the lamp 1 to a constant value when the color wheel 2 extracts red light, green light, and blue light, respectively, regardless of the ratio of the white component.
　本実施形態では、ランプ制御部５１は、白色成分の比率が閾値よりも小さい場合、カラーホイール２が白色の光を抽出する状況でのランプ１の電力を、白色成分の比率が閾値よりも大きい場合にカラーホイール２が白色の光を抽出する状況でのランプ１の電力よりも小さくする。なお、閾値はランプ制御部５１に予め登録されている。 In the present embodiment, when the white component ratio is smaller than the threshold, the lamp control unit 51 uses the power of the lamp 1 when the color wheel 2 extracts white light, and the white component ratio is larger than the threshold. In this case, the power of the lamp 1 is set to be smaller than that in a situation where the color wheel 2 extracts white light. The threshold value is registered in advance in the lamp control unit 51.
　ランプ制御部５１は、カラーホイール２が白色、赤色、緑色、青色の光を各々抽出する状況でのランプ１の電力を示す光量制御信号を生成し、光量制御信号をランプ駆動部５２に出力する。 The lamp control unit 51 generates a light amount control signal indicating the power of the lamp 1 when the color wheel 2 extracts white, red, green, and blue light, and outputs the light amount control signal to the lamp driving unit 52. .
　ランプ駆動部５２は、ランプ制御部５１からの光量制御信号と、プロジェクター制御部３からの白色成分の映像信号、赤色成分の映像信号、緑色成分の映像信号および青色成分の映像信号と、に従って、ランプ１に供給する電力、つまり、ランプ１の光量を制御する。 The lamp driving unit 52 follows the light amount control signal from the lamp control unit 51, the white component video signal, the red component video signal, the green component video signal, and the blue component video signal from the projector control unit 3, respectively. The power supplied to the lamp 1, that is, the light quantity of the lamp 1 is controlled.
　カラーホイール駆動部６は、白色成分の映像信号を受け付けている間はカラーホイール２がランプ１の光から白色の光を抽出し、赤色成分の映像信号を受け付けている間はカラーホイール２がランプ１の光から赤色の光を抽出し、緑色成分の映像信号を受け付けている間はカラーホイール２がランプ１の光から緑色の光を抽出し、青色成分の映像信号を受け付けている間はカラーホイール２がランプ１からの光から青色の光を抽出するように、カラーホイール２の回転を制御する。 The color wheel drive unit 6 extracts the white light from the light of the lamp 1 while receiving the white component video signal, and the color wheel 2 is the lamp while receiving the red component video signal. The red light is extracted from the light 1 and the color wheel 2 extracts the green light from the light of the lamp 1 while the green component video signal is received, and the color while the blue component video signal is received. The rotation of the color wheel 2 is controlled so that the wheel 2 extracts blue light from the light from the lamp 1.
　DMD駆動部７は、白色成分の映像信号を受け付けると、白色成分の映像信号に従ってDMD８を駆動し、赤色成分の映像信号を受け付けると、赤色成分の映像信号に従ってDMD８を駆動し、緑色成分の映像信号を受け付けると、緑色成分の映像信号に従ってDMD８を駆動し、青色成分の映像信号を受け付けると、青色成分の映像信号に従ってDMD８を駆動する。 When receiving the white component video signal, the DMD driving unit 7 drives the DMD 8 according to the white component video signal, and when receiving the red component video signal, the DMD driving unit 7 drives the DMD 8 according to the red component video signal to generate the green component video. When the signal is received, the DMD 8 is driven according to the green component video signal, and when the blue component video signal is received, the DMD 8 is driven according to the blue component video signal.
　DMD８は、光変調手段の一例である。DMD８は、カラーホイール２にて順次抽出された各色の光を、映像信号のうち該光の色に応じた成分の信号に応じて変調し、変調された各色の光を、光学系９を介してスクリーン等の表示面に重ねることで映像信号に応じた画像を表示する。 DMD8 is an example of light modulation means. The DMD 8 modulates the light of each color sequentially extracted by the color wheel 2 according to the signal of the component corresponding to the color of the light in the video signal, and the modulated light of each color via the optical system 9. The image corresponding to the video signal is displayed by superimposing it on a display surface such as a screen.
　次に、動作を説明する。 Next, the operation will be described.
　プロジェクター制御部３は、映像信号を受け付けると、映像信号から、白色成分の映像信号と、赤色成分の映像信号と、緑色成分の映像信号と、青色成分の映像信号と、を生成する。 Upon receiving the video signal, the projector control unit 3 generates a white component video signal, a red component video signal, a green component video signal, and a blue component video signal from the video signal.
　続いて、プロジェクター制御部３は、白色成分の映像信号を色成分抽出部４に出力し、また、白色成分の映像信号と、赤色成分の映像信号と、緑色成分の映像信号と、青色成分の映像信号とを、順次、カラーホイール駆動部６と、ランプ駆動部５２と、DMD駆動部７に出力する。 Subsequently, the projector control unit 3 outputs the white component video signal to the color component extraction unit 4, and the white component video signal, the red component video signal, the green component video signal, and the blue component video signal The video signals are sequentially output to the color wheel driving unit 6, the lamp driving unit 52, and the DMD driving unit 7.
　色成分抽出部４は、白色成分の映像信号に基づいて、映像信号にて表される画像での白色成分の比率を検出する。 The color component extraction unit 4 detects the ratio of the white component in the image represented by the video signal based on the white component video signal.
　例えば、色成分抽出部４は、白色成分の映像信号にて表される画像の全画素数に対する、白色成分の映像信号にて表される画像内の白色の画素の数の比を、白色成分の比率（映像比率）として算出する。 For example, the color component extraction unit 4 calculates the ratio of the number of white pixels in the image represented by the white component video signal to the total number of pixels of the image represented by the white component video signal. Is calculated as a ratio (video ratio).
　図４および図５は、色成分抽出部４にて検出された白色成分の比率の例を示した図である。 4 and 5 are diagrams showing examples of the ratio of the white component detected by the color component extraction unit 4.
　なお、図４は、白色成分の比率が閾値よりも大きい場合を示し、図５は、白色成分の比率が閾値よりも小さい場合を示す。 FIG. 4 shows a case where the ratio of the white component is larger than the threshold value, and FIG. 5 shows a case where the ratio of the white component is smaller than the threshold value.
　色成分抽出部４は、白色成分の比率の算出結果をランプ制御部５１に出力する。 The color component extraction unit 4 outputs the calculation result of the white component ratio to the lamp control unit 51.
　ランプ制御部５１は、白色成分の比率の算出結果を受け付けると、白色成分の比率の算出結果と閾値とを比較する。 When the lamp control unit 51 receives the calculation result of the white component ratio, the lamp control unit 51 compares the calculation result of the white component ratio with a threshold value.
　白色成分の比率の算出結果が閾値よりも大きい場合（例えば、図４の場合）、ランプ制御部５１は、白色光抽出時のランプ１の電力比率を１２８％とし、他の色の光（赤色、緑色、青色の光）抽出時のランプ１の電力比率を８５％に設定する。 When the calculation result of the white component ratio is larger than the threshold (for example, in the case of FIG. 4), the lamp control unit 51 sets the power ratio of the lamp 1 at the time of white light extraction to 128%, and other colors of light (red , Green and blue light), the power ratio of the lamp 1 during extraction is set to 85%.
　続いて、ランプ制御部５１は、白色光抽出時のランプ１の電力比率を１２８％とし他の色の光抽出時のランプ１の電力比率を８５％とする光量制御信号を生成し、その光量制御信号をランプ駆動部５２に出力する。 Subsequently, the lamp control unit 51 generates a light amount control signal that sets the power ratio of the lamp 1 at the time of white light extraction to 128% and the power ratio of the lamp 1 at the time of light extraction of other colors to 85%, and the light amount thereof. A control signal is output to the lamp driver 52.
　ランプ駆動部５２は、光量制御信号と、白色成分の映像信号と、赤色成分の映像信号と、緑色成分の映像信号と、青色成分の映像信号と、に従って、ランプ１に供給する電力（ランプ１の光量）を制御する。 The lamp driving unit 52 supplies power (lamp 1) to the lamp 1 according to the light amount control signal, the white component video signal, the red component video signal, the green component video signal, and the blue component video signal. The amount of light).
　図６は、白色光抽出時のランプ１の電力比率を１２８％とし他の色の光抽出時のランプ１の電力比率を８５％とする光量制御信号を受け付けたときのランプ１の動作を示した図である。 FIG. 6 shows the operation of the lamp 1 when a light amount control signal is received in which the power ratio of the lamp 1 at the time of white light extraction is 128% and the power ratio of the lamp 1 at the time of light extraction of other colors is 85%. It is a figure.
　図６に示したように、カラーホイール２が白色光を抽出する時のランプ１の電力比率が１２８％となり、カラーホイール２が他の色の光を抽出する時のランプ１の電力比率が８５％となる。 As shown in FIG. 6, the power ratio of the lamp 1 when the color wheel 2 extracts white light is 128%, and the power ratio of the lamp 1 when the color wheel 2 extracts light of other colors is 85%. %.
　本実施形態では、白色成分が多い場合は、カラーホイール２が白色の光を抽出しているときのランプ１の電力を高くすることで、投射映像全体を明るくすることができる。 In the present embodiment, when there are many white components, the entire projected image can be brightened by increasing the power of the lamp 1 when the color wheel 2 is extracting white light.
　一方、白色成分の比率の算出結果が閾値よりも小さい場合（例えば、図５の場合）、ランプ制御部５１は、白色光抽出時のランプ１の電力比率を８５％とし、他の色の光（赤色、緑色、青色の光）抽出時のランプ１の電力比率を８５％に設定する。 On the other hand, when the calculation result of the ratio of the white component is smaller than the threshold (for example, in the case of FIG. 5), the lamp control unit 51 sets the power ratio of the lamp 1 at the time of white light extraction to 85%, and lights of other colors. (Red, green, blue light) The power ratio of the lamp 1 at the time of extraction is set to 85%.
　続いて、ランプ制御部５１は、白色光抽出時のランプ１の電力比率を８５％とし他の色の光抽出時のランプ１の電力比率を８５％とする光量制御信号を生成し、その光量制御信号をランプ駆動部５２に出力する。 Subsequently, the lamp control unit 51 generates a light amount control signal that sets the power ratio of the lamp 1 during white light extraction to 85% and the power ratio of the lamp 1 during light extraction of other colors to 85%. A control signal is output to the lamp driver 52.
　ランプ駆動部５２は、光量制御信号と、白色成分の映像信号と、赤色成分の映像信号と、緑色成分の映像信号と、青色成分の映像信号と、に従って、ランプ１に供給する電力（ランプ１の光量）を制御する。 The lamp driving unit 52 supplies power (lamp 1) to the lamp 1 according to the light amount control signal, the white component video signal, the red component video signal, the green component video signal, and the blue component video signal. The amount of light).
　図７は、白色光抽出時のランプ１の電力比率を８５％とし他の色の光抽出時のランプ１の電力比率を８５％とする光量制御信号を受け付けたときのランプ１の動作を示した図である。 FIG. 7 shows the operation of the lamp 1 when a light amount control signal is received in which the power ratio of the lamp 1 when extracting white light is 85% and the power ratio of the lamp 1 when extracting light of other colors is 85%. It is a figure.
　図７に示したように、カラーホイール２が白色光を抽出する時のランプ１の電力比率が８５％となり、カラーホイール２が他の色の光を抽出する時のランプ１の電力比率が８５％となる。 As shown in FIG. 7, the power ratio of the lamp 1 when the color wheel 2 extracts white light is 85%, and the power ratio of the lamp 1 when the color wheel 2 extracts light of other colors is 85%. %.
　本実施形態では、白色成分が少ない場合は、カラーホイール２が赤色、緑色、青色の光を抽出しているときのランプ１の電力を上げることなく、カラーホイール２が白色の光を抽出しているときのランプ１の電力を下げ、ランプ１の平均電力を下げる。 In the present embodiment, when the white component is small, the color wheel 2 extracts white light without increasing the power of the lamp 1 when the color wheel 2 is extracting red, green, and blue light. The power of the lamp 1 is lowered when the lamp is on, and the average power of the lamp 1 is lowered.
　また、白色成分の比率の算出結果が閾値と同じである場合、ランプ制御部５１は、白色成分の比率の算出結果が閾値よりも大きい場合と同様に動作する。なお、白色成分の比率の算出結果が閾値と同じである場合、ランプ制御部５１は、白色成分の比率の算出結果が閾値よりも大きい場合と同様に動作せずに、白色成分の比率の算出結果が閾値よりも小さい場合と同様に動作してもよい。 When the calculation result of the white component ratio is the same as the threshold value, the lamp control unit 51 operates in the same manner as when the calculation result of the white component ratio is larger than the threshold value. When the calculation result of the white component ratio is the same as the threshold value, the lamp control unit 51 does not operate as in the case where the calculation result of the white component ratio is larger than the threshold value, and calculates the white component ratio. The operation may be the same as when the result is smaller than the threshold value.
　次に、本実施形態の効果を説明する。 Next, the effect of this embodiment will be described.
　色成分抽出部４は、映像信号に基づいて、映像信号にて表される画像での白色成分の比率を検出する。制御部５は、カラーホイール２が白色の光を抽出する状況では、色成分抽出部４にて検出された白色成分の比率に応じてランプ１の光量を制御する。DMD８は、カラーホイール２にて順次抽出された各色の光を、映像信号のうち該光の色に応じた成分の信号に応じて変調し、変調された各色の光を表示面に重ねることで映像信号に応じた画像を表示する。 The color component extraction unit 4 detects the ratio of the white component in the image represented by the video signal based on the video signal. In a situation where the color wheel 2 extracts white light, the control unit 5 controls the light amount of the lamp 1 in accordance with the ratio of the white component detected by the color component extraction unit 4. The DMD 8 modulates the light of each color sequentially extracted by the color wheel 2 according to the signal of the component corresponding to the color of the light in the video signal, and superimposes the modulated light of each color on the display surface. An image corresponding to the video signal is displayed.
　このため、カラーホイール２が白色の光を抽出する状況でランプ１の光量が減っても、カラーホイール２が白色と異なる色の光を抽出する状況ではランプ１の光量は上がらなくなる。よって、ランプ１での平均電力を下げることができ、消費電力を低減することが可能になる。 For this reason, even if the light intensity of the lamp 1 is reduced when the color wheel 2 extracts white light, the light intensity of the lamp 1 cannot be increased when the color wheel 2 extracts light of a color different from white. Therefore, the average power in the lamp 1 can be reduced, and the power consumption can be reduced.
　なお、上記効果は、ランプ１とカラーホイール２と色成分抽出部４と制御部５とDMD８とからなる画像表示装置でも奏する。 Note that the above-described effect is also achieved by an image display device including the lamp 1, the color wheel 2, the color component extraction unit 4, the control unit 5, and the DMD 8.
　本実施形態では、制御部５は、カラーホイール２が赤色、緑色、青色の光を抽出する状況ではランプ１の光量を一定値に維持する。 In the present embodiment, the control unit 5 maintains the light amount of the lamp 1 at a constant value in a situation where the color wheel 2 extracts red, green, and blue light.
　このため、赤色、緑色、青色の明るさを維持したままランプ１の消費電力を削減することが可能になる。よって、白色以外の色の持つ画素の明るさの低下を抑えつつ消費電力を削減することが可能になる。 Therefore, it is possible to reduce the power consumption of the lamp 1 while maintaining the red, green, and blue brightness. Therefore, it is possible to reduce power consumption while suppressing a decrease in brightness of pixels having colors other than white.
　本実施形態では、制御部５は、白色成分の比率が閾値よりも小さくなると、カラーホイール２が白色の光を抽出する状況でのランプ１からの光量を減少する。 In the present embodiment, when the ratio of the white component becomes smaller than the threshold value, the control unit 5 reduces the amount of light from the lamp 1 when the color wheel 2 extracts white light.
　このため、白色成分の比率と閾値との大小関係に基づいて、カラーホイール２が白色の光を抽出する状況でランプ１からの光量を制御することが可能になる。 For this reason, it is possible to control the light quantity from the lamp 1 in a situation where the color wheel 2 extracts white light based on the magnitude relationship between the ratio of the white component and the threshold value.
　なお、本実施形態では１つの閾値を用いてランプ１の光量を制御するようにしたが、制御部５は、例えば、複数の閾値と各閾値に応じたランプ１の光量とを示したデータテーブルや、そのデータテーブルと共に複数の閾値およびランプ１の光量の補間処理を行うことによって、白色成分の比率が小さくなるほど、カラーホイール２が白色の光を抽出する状況でのランプ１からの光量を減少してもよい。 In the present embodiment, the light quantity of the lamp 1 is controlled using one threshold value, but the control unit 5 is, for example, a data table showing a plurality of threshold values and the light quantity of the lamp 1 corresponding to each threshold value. In addition, by performing interpolation processing of a plurality of threshold values and the light amount of the lamp 1 together with the data table, the light amount from the lamp 1 in a situation where the color wheel 2 extracts white light decreases as the white component ratio decreases. May be.
　本実施形態では、白色と異なる色として、赤色、緑色および青色を用いたが、白色と異なる色は、赤色、緑色および青色に限らず、例えば、シアン、マゼンダおよびイエロでもよい。 In this embodiment, red, green, and blue are used as colors different from white. However, colors different from white are not limited to red, green, and blue, and may be cyan, magenta, and yellow, for example.
　本実施形態では、制御部５は、白色成分の比率が閾値よりも小さくなると、カラーホイール２が白色の光を抽出する状況でのランプ１からの光量を、カラーホイール２が赤色、緑色、青色の光を抽出する状況でのランプ１からの光量と等しくしたが、白色成分の比率が閾値よりも小さいときにカラーホイール２が白色の光を抽出する状況でのランプ１からの光量は、白色成分の比率が閾値よりも大きいときにカラーホイール２が白色の光を抽出する状況でのランプ１からの光量よりも少なければよい。 In this embodiment, when the ratio of the white component becomes smaller than the threshold value, the control unit 5 determines the amount of light from the lamp 1 when the color wheel 2 extracts white light, and the color wheel 2 is red, green, and blue. The amount of light from the lamp 1 in the situation where the color wheel 2 extracts white light when the ratio of the white component is smaller than the threshold is white. It should be less than the amount of light from the lamp 1 when the color wheel 2 extracts white light when the ratio of the components is larger than the threshold.
　また、本実施形態では、制御部５は、カラーホイール２が赤色、緑色、青色の光を抽出する状況でのランプ１からの光量をそれぞれ等しくしたが、赤色の光を抽出する状況でのランプ１からの光量と、緑色の光を抽出する状況でのランプ１からの光量と、青色の光を抽出する状況でのランプ１からの光量とをそれぞれ異なるように設定してもよい。 In the present embodiment, the control unit 5 uses the same amount of light from the lamp 1 when the color wheel 2 extracts red, green, and blue light, but the lamp when the color wheel 2 extracts red light. The amount of light from 1, the amount of light from the lamp 1 when green light is extracted, and the amount of light from the lamp 1 when blue light is extracted may be set differently.
　本実施形態では、光変調手段の一例としてDMDが用いられたが、光変調手段はDMDに限らず適宜変更可能であり、例えば液晶パネルでもよい。 In this embodiment, the DMD is used as an example of the light modulation means, but the light modulation means is not limited to the DMD and can be changed as appropriate. For example, a liquid crystal panel may be used.
　また、光量制御信号に示される各色に対応するランプ１の電力は上記に限らず適宜変更可能である。 Further, the power of the lamp 1 corresponding to each color indicated in the light amount control signal is not limited to the above and can be changed as appropriate.
　以上、実施形態を参照して本願発明を説明したが、本願発明は上記実施形態に限定されるものではない。本願発明の構成や詳細には、本願発明のスコープ内で当業者が理解し得る様々な変更をすることができる。 The present invention has been described above with reference to the embodiments, but the present invention is not limited to the above embodiments. Various changes that can be understood by those skilled in the art can be made to the configuration and details of the present invention within the scope of the present invention.
　１００　　　プロジェクター
　　　１　　　ランプ
　　　２　　　カラーホイール
　　　３　　　プロジェクター制御部
　　　４　　　色成分抽出部
　　　５　　　制御部
　　　５１　　ランプ制御部
　　　５２　　ランプ駆動部
　　　６　　　カラーホイール駆動部
　　　７　　　DMD駆動部
　　　８　　　DMD DESCRIPTION OF SYMBOLS 100 Projector 1 Lamp 2 Color wheel 3 Projector control part 4 Color component extraction part 5 Control part 51 Lamp control part 52 Lamp drive part 6 Color wheel drive part 7 DMD drive part 8 DMD

Claims (6)

  1. 　光を出力する光源と、
    　前記光源から出力された光から、白色の光と白色と異なる色の光とを順次抽出する抽出手段と、
    　入力映像信号に基づいて、該入力映像信号にて表される画像での白色成分の比率を検出する検出手段と、
    　前記抽出手段が前記白色と異なる色の光を抽出する状況では、前記光源の光量を上げず、前記抽出手段が前記白色の光を抽出する状況では、前記検出手段にて検出された白色成分の比率に応じて前記光源の光量を制御する制御手段と、
    　前記抽出手段にて順次抽出された各色の光を、前記入力映像信号のうち該光の色に応じた成分の信号に応じて変調し、変調された各色の光を表示面に重ねることで前記入力映像信号に応じた画像を表示する光変調手段と、を含む画像表示装置。     A light source that outputs light;
    Extraction means for sequentially extracting white light and light of a color different from white from the light output from the light source;
    Detecting means for detecting a ratio of a white component in an image represented by the input video signal based on the input video signal;
    In the situation where the extraction means extracts light of a color different from the white, the light quantity of the light source is not increased, and in the situation where the extraction means extracts the white light, the white component detected by the detection means Control means for controlling the light quantity of the light source according to the ratio;
    The light of each color sequentially extracted by the extracting means is modulated according to a signal of a component corresponding to the color of the light in the input video signal, and the modulated light of each color is superimposed on the display surface. And an optical modulation means for displaying an image corresponding to the input video signal.
  2. 　請求項１に記載の画像表示装置において、
    　前記制御手段は、前記抽出手段が前記白色と異なる色の光を抽出する状況では前記光源の光量を一定値に維持する、画像表示装置。     The image display device according to claim 1,
    The control means is an image display device that maintains the light quantity of the light source at a constant value in a situation where the extraction means extracts light of a color different from the white color.
  3. 　請求項１または２に記載の画像表示装置において、
    　前記制御手段は、前記白色成分の比率が閾値よりも小さくなると、前記抽出手段が前記白色の光を抽出する状況での前記光源からの光量を減少する、画像表示装置。     The image display device according to claim 1 or 2,
    When the ratio of the white component becomes smaller than a threshold value, the control unit reduces the amount of light from the light source when the extraction unit extracts the white light.
  4. 　請求項１または２に記載の画像表示装置において、
    　前記制御手段は、前記白色成分の比率が小さくなるほど、前記抽出手段が前記白色の光を抽出する状況での前記光源からの光量を減少する、画像表示装置。     The image display device according to claim 1 or 2,
    The image display apparatus, wherein the control unit decreases the amount of light from the light source when the extraction unit extracts the white light as the ratio of the white component decreases.
  5. 　請求項１から４のいずれか１項に記載の画像表示装置において、
    　前記白色と異なる色の光は、赤色、緑色および青色、または、シアン、マゼンダおよびイエロである、画像表示装置。     In the image display device according to any one of claims 1 to 4,
    The image display device, wherein the light of a color different from white is red, green and blue, or cyan, magenta and yellow.
  6. 　画像表示装置が行う画像表示方法であって、
    　光源から照射された光から、白色の光と白色と異なる色の光とを順次抽出し、
    　入力映像信号に基づいて、該入力映像信号にて表される画像での白色成分の比率を検出し、
    　前記抽出手段が前記白色と異なる色の光を抽出する状況では、前記光源の光量を上げず、前記白色の光を抽出する状況では、前記白色成分の比率に応じて前記光源の光量を制御し、
    　前記順次抽出された各色の光を、前記入力映像信号のうち該光の色に応じた成分の信号に応じて変調し、変調された各色の光を表示面に重ねることで前記入力映像信号に応じた画像を表示する、画像表示方法。     An image display method performed by an image display device,
    From the light emitted from the light source, white light and light of a different color from white are sequentially extracted.
    Based on the input video signal, the ratio of the white component in the image represented by the input video signal is detected,
    In the situation where the extraction means extracts light of a color different from the white, the light quantity of the light source is not increased, and in the situation where the white light is extracted, the light quantity of the light source is controlled according to the ratio of the white component. ,
    The sequentially extracted light of each color is modulated according to a signal of a component corresponding to the color of the light in the input video signal, and the modulated light of each color is superimposed on a display surface to form the input video signal. An image display method for displaying a corresponding image.
PCT/JP2014/056283 2014-03-11 2014-03-11 Image display device and method for displaying image WO2015136616A1 (en)

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2004301932A (en) * 2003-03-28 2004-10-28 Matsushita Electric Ind Co Ltd Image display device
WO2006027866A1 (en) * 2004-09-03 2006-03-16 Sharp Kabushiki Kaisha Projector
JP2006317845A (en) * 2005-05-16 2006-11-24 Nec Viewtechnology Ltd Image display apparatus having color ring switching mechanism and color wheel control method
JP2007279366A (en) * 2006-04-06 2007-10-25 Sharp Corp Projector
JP2010085726A (en) * 2008-09-30 2010-04-15 Casio Computer Co Ltd Projection apparatus, projection method and program

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2004301932A (en) * 2003-03-28 2004-10-28 Matsushita Electric Ind Co Ltd Image display device
WO2006027866A1 (en) * 2004-09-03 2006-03-16 Sharp Kabushiki Kaisha Projector
JP2006317845A (en) * 2005-05-16 2006-11-24 Nec Viewtechnology Ltd Image display apparatus having color ring switching mechanism and color wheel control method
JP2007279366A (en) * 2006-04-06 2007-10-25 Sharp Corp Projector
JP2010085726A (en) * 2008-09-30 2010-04-15 Casio Computer Co Ltd Projection apparatus, projection method and program

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