WO2016152499A1 - Dispositif d'affichage d'images - Google Patents

Dispositif d'affichage d'images Download PDF

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Publication number
WO2016152499A1
WO2016152499A1 PCT/JP2016/057117 JP2016057117W WO2016152499A1 WO 2016152499 A1 WO2016152499 A1 WO 2016152499A1 JP 2016057117 W JP2016057117 W JP 2016057117W WO 2016152499 A1 WO2016152499 A1 WO 2016152499A1
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WO
WIPO (PCT)
Prior art keywords
image information
image
brightness
luminance
light
Prior art date
Application number
PCT/JP2016/057117
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English (en)
Japanese (ja)
Inventor
司 水澤
Original Assignee
アルプス電気株式会社
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.)
Filing date
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Application filed by アルプス電気株式会社 filed Critical アルプス電気株式会社
Publication of WO2016152499A1 publication Critical patent/WO2016152499A1/fr

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
    • B60K35/00—Instruments specially adapted for vehicles; Arrangement of instruments in or on vehicles
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/01—Head-up displays
    • 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
    • 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
    • G09G5/10—Intensity circuits

Definitions

  • the present invention relates to an image display device used for a head-up display or the like, and more particularly to an image display device having a brightness adjustment function.
  • a head-up display that displays a display (hologram) image as a virtual image in front of the windshield so that the driver can grasp information such as speed and mileage without moving the line of sight while driving The device is being installed.
  • a head-up display has a function of adjusting display luminance according to external light so that the driver can visually recognize the display screen even when the surrounding environment during traveling changes.
  • the laser light from the light emitting unit is subjected to PWM (Pulse Width Modulation) control, and the luminance is changed by adjusting the light emission time.
  • PWM Pulse Width Modulation
  • the laser emission time is shortened in order to reduce the brightness.
  • FIG. 7 if light is incident on the rotating diffusion plate in a state where the light emission time of the laser is short, the amount of incident light per unit area is reduced, which reduces the effect of reducing speckle noise. There is a problem that the image quality deteriorates.
  • the present invention has been made in view of such circumstances, and an object of the present invention is to provide an image display device capable of displaying a high-quality image even when the luminance is lowered when an image is formed by modulating light from a light source.
  • the purpose is to do.
  • an image display device of the present invention includes a luminance correction setting unit that sets luminance correction information for adjusting the luminance of original image information, and the setting Based on the brightness correction information, the brightness of the original image information is corrected to generate display image information, and the light from the light source is modulated based on the generated display image information And an image forming unit.
  • the luminance correction information of the original image information is generated in the luminance correction setting unit, and light is modulated in the image forming unit based on the display image information whose luminance is corrected. Therefore, unlike the conventional case, since it is not necessary to shorten the light emission time of the light source, a sufficient amount of incident light can be secured in the light diffusing unit at the subsequent stage of the image forming unit, and the speckle noise reduction effect can be appropriately exhibited. Therefore, it is possible to provide a high-quality image in which speckle noise is suppressed.
  • the luminance correction setting unit of the image display device of the present invention sets the luminance correction information for each of a plurality of block image information in different areas constituting the original image information, and the image information generation unit For each of the plurality of block image information, the display image information is generated using the luminance correction information set for the block image information.
  • luminance correction can be performed for each block image information, and appropriate luminance correction according to the attribute can be performed for each block image.
  • the brightness correction setting unit of the image display device of the present invention calculates an average value of the brightness of the plurality of block image information, and based on the average value and the brightness of the plurality of block image information, A brightness correction value is calculated for each of the plurality of block image information so that the brightness is constant among the plurality of block image information, and the image information generation unit performs the block image information for each of the block image information.
  • the display image information is generated by correcting the brightness of the original image information using the brightness correction value calculated for the.
  • the brightness correction is performed so that the brightness is constant among a plurality of pieces of block image information, the brightness of the entire display image can be kept constant.
  • the brightness correction setting unit of the image display device of the present invention calculates the brightness correction value so that the brightness of the display image corresponding to the original image information becomes a specified brightness. According to this configuration, the brightness of the display image can be set to the designated brightness.
  • the image information generation unit of the image display device of the present invention when the plurality of block image information is assigned to the intersection of the matrix according to the position of the corresponding block image, the calculation target in the block image The positional brightness, the luminance of the block image information, the luminance correction value of the block image information calculated by the luminance correction setting unit, and the positional relationship between the intersection to which the block image information is allocated and the calculation target position Based on the above. According to this configuration, the luminance at each position in the block image can be appropriately corrected according to the position, and a high-quality image can be provided.
  • the image forming unit of the image display apparatus of the present invention generates hologram diffracted light by phase-modulating the image information generated by the image information generating unit. According to this configuration, a hologram image can be displayed.
  • the image display device of the present invention further includes a light diffusion unit that diffuses light phase-modulated by the image forming unit.
  • a sufficient amount of incident light can be secured in the light diffusing unit, and the speckle noise reduction effect can be appropriately exhibited. Therefore, it is possible to provide a high-quality image in which speckle noise is suppressed.
  • the present invention when an image is formed by modulating light from a light source, it is possible to provide an image display device capable of displaying a high-quality image even when the luminance is lowered.
  • FIG. 1 is a functional block diagram of an image display device according to an embodiment of the present invention. It is a figure for demonstrating the principle in which a driver
  • 2 is a flowchart for explaining processing of a luminance correction setting unit and an image information generation unit shown in FIG. 1. It is a figure for demonstrating the correction value setting process by the brightness
  • FIG. 1 is a functional block diagram of an image display apparatus 1 according to an embodiment of the present invention.
  • FIG. 2 is a diagram for explaining the principle that the driver visually recognizes the virtual image.
  • the image display device 1 of the present embodiment is a head-up display that is used by being mounted on a vehicle (moving body).
  • the image display apparatus 1 includes, for example, a light emitting unit 11, an image forming unit 13, a Fourier transform lens 15, a light diffusing unit 17, a light reflecting unit 19, a light receiving unit 31, a light emission control unit 33, and an image memory. 41, a luminance correction setting unit 43, and an image information generation unit 47.
  • the light emitting unit 11 is composed of, for example, two laser diodes (LD) of R (red) and G (green) for displaying a virtual image.
  • the light emitting unit 11 irradiates the image forming unit 13 with light from each laser.
  • the light output of the laser of the light emitting unit 11 is controlled by the light emission control unit 33.
  • An LED element may be used as the light emitting unit 11. Further, the number of lasers and LED elements is not particularly limited. For example, it is possible to make the image display full color by adding B (blue) to the light source.
  • the image forming unit 13 phase modulates the laser light from the light emitting unit 11 based on the display image information generated by the image information generating unit 47 and irradiates the Fourier transform lens 15 with the hologram diffracted light generated by the phase modulation. To do.
  • the image forming unit 13 becomes an image display screen.
  • the image forming unit 13 is, for example, an LCOS (Liquid Crystal on Silicon) 49.
  • the LCOS is provided with MOS transistors and pixel electrodes in a matrix on a silicon CMOS substrate, and an optically transparent common electrode is provided on the pixel electrode facing surface of the substrate disposed opposite to the CMOS substrate.
  • This is a reflective liquid crystal display element composed of a liquid crystal layer sealed between these two substrates.
  • the image forming unit 13 may use a transmissive LCD or the like instead of the LCOS.
  • the Fourier transform lens 15 Fourier transforms the hologram diffracted light from the image forming unit 13 to form an image on the light diffusion unit 17.
  • the light diffusing unit 17 is a diffuser that diffuses the hologram diffracted light incident through the Fourier transform lens 15.
  • the light diffusing unit 17 has, for example, a disk-like transmissive optical component (optical element).
  • optical component optical element
  • the optical component is driven to rotate about an axis substantially parallel to the optical axis.
  • the light diffusing unit 17 suppresses spectral coherence of light that is visually recognized and causes image quality degradation.
  • the light reflecting portion 19 is composed of a magnifying mirror, and projects the light diffused from the light diffusing portion 17 on the window shield glass 51 after performing magnification and distortion correction.
  • the window shield glass 51 is provided as a vehicle windshield.
  • the light reflecting unit 19 enlarges and corrects the display image corresponding to the light from the light diffusing unit 17, projects it toward the window shield glass 51, and reflects this display image in the direction of the driver's eyes 55. As a result, the display image is formed in front of the driver as a virtual image 57 as shown in FIG. 2 so that the driver can visually recognize the display image.
  • the angle of the light reflecting portion 19 is freely adjustable to flexibly respond to changes in the driver's line-of-sight position.
  • the light receiving unit 31 includes a photodiode (PD), is provided around the light diffusion unit 17, and has a luminance adjustment image corresponding to the luminance adjustment image information included in the display image information generated by the image information generation unit 47. It is provided at the irradiated position.
  • the light emission control unit 33 inputs the light intensity from the light receiving unit 31, and feedback-controls the light output of the light emitting unit 11 so that the light intensity becomes a specified predetermined light intensity.
  • the image memory 41 stores original image information of a display image.
  • the original image information is, for example, JPEG (Joint Photographic Experts Group).
  • the luminance correction setting unit 43 reads the original image information from the image memory 41, and sets (generates) luminance correction information for adjusting the luminance of the original image information based on the original image information.
  • the image information generation unit 47 generates display image information in which the luminance of the original image information read from the image memory 41 is adjusted based on the luminance correction information set by the luminance correction setting unit 43, and this is displayed as an image forming unit. 13 is output.
  • FIG. 3 is a flowchart for explaining processing of the luminance correction setting unit 43 and the image information generation unit 47.
  • FIG. 4 is a diagram for explaining correction value setting processing by the luminance correction setting unit 43
  • FIG. 5 is a diagram for explaining luminance value correction processing by the image information generation unit 47.
  • Step ST1 The luminance correction setting unit 43 reads the original image information from the image memory 41.
  • Step ST2 As shown in FIG. 4, the luminance correction setting unit 43 calculates the luminance of the block image information of each of a plurality of regions located in a matrix that constitutes the original image information read in step ST1. Specifically, the brightness correction setting unit 43 calculates the brightness of the block image information by averaging the brightness of the pixels in each block image information. In the present embodiment, as shown in FIG. 4, the luminance is calculated for block image information of 45 regions located in a 9 ⁇ 5 matrix. Note that the luminance correction information setting unit 43 may calculate the luminance of the block image information by a method other than the averaging described above.
  • Step ST3 The brightness correction setting unit 43 calculates the average value of the brightness of the plurality of block image information calculated in step ST2. Then, the brightness correction setting unit 43, based on the calculated average value and the brightness of the plurality of block image information, sets the plurality of blocks so that the brightness is constant among the plurality of block image information. A luminance correction value is calculated for each image information.
  • the luminance correction setting unit 43 calculates (sets) the luminance correction value so that the luminance of the display image corresponding to the plurality of pieces of block image information becomes the specified luminance.
  • the designation of the luminance is performed based on, for example, an operation input by the driver or a detection result of external light from the surrounding environment. When the external light detection result is used, correction is performed so that the luminance decreases as the light intensity of the external light decreases.
  • Step ST4 As shown in FIG. 5, the image information generation unit 47 determines the luminance of the block image information of the original image information read from the image memory 41, the luminance correction value of the block image information set in step ST3, and the block image information.
  • the calculation target position (each pixel position) in the block image defined by the block image information (Gx) by linear interpolation based on the position relationship between the intersection position of the matrix to which the brightness correction value is assigned and the calculation target position. , Gy) is corrected to generate display image information.
  • the coordinates for obtaining the luminance in the region surrounded by the four intersections are set as (Gx, Gy), the luminance to be obtained is set as C (Gx, Gy), and Px as in the following formulas (1) and (2) , Py, the following equation (3) is established.
  • the size of the display image is 540 ⁇ 190 in the X ⁇ Y direction.
  • the block image is defined by dividing into 8 parts in the X direction and 4 parts in the Y direction.
  • Step ST5 The image information generation unit 47 outputs the display image information generated in step ST4 to the image forming unit 13.
  • the luminance correction setting unit 43 uses the block image information as shown in FIG. 4 based on the original image information read from the image memory 41. The brightness value and the brightness correction value are calculated.
  • step ST4 shown in FIG. 5
  • a corrected luminance value at each pixel position is calculated.
  • display image information composed of these corrected luminance values is output from the image information generation unit 47 to the image forming unit 13.
  • the image display device 1 In the image display device 1, light from the light emitting unit 11 enters the image forming unit 13. Then, the image forming unit 13 phase-modulates the laser light from the light emitting unit 11 based on the display image information generated by the image information generating unit 47, and converts the hologram diffracted light generated by the phase modulation into the Fourier transform lens 15. Irradiate. Then, the hologram diffracted light is diffused in the light diffusing unit 17, directed by the light reflecting unit 19, and irradiated on the window shield glass 51.
  • the light projected from the light reflecting portion 19 onto the window shield glass 51 is reflected by the window shield glass 51 and reaches the viewpoint 55 of the driver (passenger).
  • the driver can visually recognize a virtual image (virtual image display image) 57 obtained by enlarging an image corresponding to the light from the light reflecting portion 19 at a point in front of the window shield glass 51.
  • the display surface of the image forming unit 13, the image formed on the diffusion region of the light diffusion unit 17, and the virtual image 57 are in a conjugate relationship.
  • the luminance correction value is generated in the luminance correction setting unit 43, and the image forming unit 13 receives the light from the light emitting unit 11 based on the display image information whose luminance is corrected. Modulate light. That is, the hologram diffracted light whose luminance is adjusted can be output from the image forming unit 13.
  • the light intensity from the laser from the light emitting unit 11 can be made constant, and it is not necessary to shorten the light emission time of the light source as in the prior art, so a sufficient amount of incident light is secured in the light diffusing unit 17. And can exhibit the speckle noise reduction effect appropriately. Thereby, a high-quality image in which speckle noise is suppressed can be provided. Further, as compared with the case where the luminance is adjusted by the light emission control unit 33, it is possible to prevent the influence of the response time of the circuit. That is, in the image display device 1, as shown in FIG. 6, it is not necessary to reduce the light output of the light emitting unit 11 in order to adjust the luminance of the projection image generated by the image forming unit 13.
  • the luminance correction value is calculated for each block image information from the original image information, and the luminance correction is performed based on this. Therefore, appropriate luminance correction according to the attribute can be performed for each block image.
  • the luminance correction is performed so that the luminance is constant among a plurality of block image information. Therefore, the brightness of the entire display image can be made constant.
  • the brightness correction value is calculated so that the brightness of the display image corresponding to the original image information becomes the designated brightness. Therefore, the brightness of the display image can be set to the designated brightness.
  • the image display apparatus 1 calculates the corrected luminance value of each pixel in the block image as described with reference to FIG. Therefore, the luminance at each position in the block image can be appropriately corrected according to the position, and a high-quality image can be provided.
  • the case where the original image information is subjected to luminance correction and phase modulation for each block image information is exemplified. It is not limited. Further, luminance correction and phase modulation may be performed not for each block image information but for each original image information.
  • the present invention is applicable to an image display device that generates a display image by phase-modulating light from a light source.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • Theoretical Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Optics & Photonics (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)
  • Instrument Panels (AREA)

Abstract

L'invention concerne un dispositif d'affichage d'images qui permet, lors de la formation d'une image en modulant une lumière provenant d'une source lumineuse, d'afficher une image de haute qualité même en luminance réduite. Dans une unité 43 de réglage de correction de luminance, un valeur de luminance et un valeur de correction de luminance sont calculées pour chaque information d'image de bloc d'après des informations d'image d'origine. Dans une unité 47 de génération d'informations d'images, une valeur de luminance corrigée à chaque position de pixel est calculée d'après la valeur de luminance et la valeur de correction de luminance associées à l'information d'image de bloc. D'après les informations d'images d'affichage générées par l'unité 47 de génération d'informations d'images, une unité 13 de formation d'images module la phase de la lumière laser émise à partir d'une unité émettrice 11 de lumière et génère une lumière diffractée d'hologramme.
PCT/JP2016/057117 2015-03-20 2016-03-08 Dispositif d'affichage d'images WO2016152499A1 (fr)

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JP2015058582 2015-03-20
JP2015-058582 2015-03-20

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008203292A (ja) * 2007-02-16 2008-09-04 Seiko Epson Corp 画像表示装置、及び画像表示方法
WO2012114682A1 (fr) * 2011-02-23 2012-08-30 パナソニック株式会社 Dispositif d'affichage et procédé d'affichage
JP2013187794A (ja) * 2012-03-09 2013-09-19 Seiko Epson Corp 虚像表示装置
WO2014096862A1 (fr) * 2012-12-21 2014-06-26 Two Trees Photonics Limited Projection d'image holographique comportant une correction holographique

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008203292A (ja) * 2007-02-16 2008-09-04 Seiko Epson Corp 画像表示装置、及び画像表示方法
WO2012114682A1 (fr) * 2011-02-23 2012-08-30 パナソニック株式会社 Dispositif d'affichage et procédé d'affichage
JP2013187794A (ja) * 2012-03-09 2013-09-19 Seiko Epson Corp 虚像表示装置
WO2014096862A1 (fr) * 2012-12-21 2014-06-26 Two Trees Photonics Limited Projection d'image holographique comportant une correction holographique

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