WO2016103869A1 - Dispositif de traitement d'image - Google Patents

Dispositif de traitement d'image Download PDF

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Publication number
WO2016103869A1
WO2016103869A1 PCT/JP2015/079466 JP2015079466W WO2016103869A1 WO 2016103869 A1 WO2016103869 A1 WO 2016103869A1 JP 2015079466 W JP2015079466 W JP 2015079466W WO 2016103869 A1 WO2016103869 A1 WO 2016103869A1
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WO
WIPO (PCT)
Prior art keywords
light
phase
amplitude
image
modulated light
Prior art date
Application number
PCT/JP2015/079466
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English (en)
Japanese (ja)
Inventor
大西　道久
剛 白坂
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
Publication date
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 WO2016103869A1 publication Critical patent/WO2016103869A1/fr

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    • 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
    • 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
    • G02B27/18—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 for optical projection, e.g. combination of mirror and condenser and objective
    • 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
    • G02B27/42—Diffraction optics, i.e. systems including a diffractive element being designed for providing a diffractive effect
    • G02B27/46—Systems using spatial filters

Definitions

  • the present invention relates to an image processing device that generates a hologram image by modulating laser light.
  • Patent Document 1 has a DMD (Digital Mirror Device) that emits display light constituting a display image, and an emission surface that emits received display light as diffused light, and makes the light intensity distribution of the diffused light substantially uniform.
  • a head-up display device is disclosed in which a driver visually recognizes a virtual image of a display image by reflecting display light emitted from a display device including a transmissive screen with a windshield.
  • Patent Document 2 includes a light source, a scanning unit that scans light from the light source, a screen on which an image is formed by scanning light from the scanning unit, and a projection unit that projects an image formed on the screen.
  • a vehicle head-up display device that projects a virtual image in front of a driver by reflecting image light emitted from the vehicle by a projection unit is disclosed.
  • an object of the present invention is to provide an image processing apparatus capable of displaying different images at a plurality of display positions with a simple configuration while suppressing cost.
  • an image processing apparatus generates phase-modulated light by performing phase modulation on a laser light source and a part of light emitted from the laser light source.
  • a modulation element that generates amplitude modulated light by performing amplitude modulation on light that has not been modulated, a first optical system that performs Fourier transform on the phase modulated light, and collects the amplitude modulated light, and a first optical system.
  • a second optical system for generating a first image based on the phase-modulated light subjected to Fourier transform and generating a second image based on the amplitude-modulated light collected by the first optical system.
  • the first optical system generates a first intermediate image by Fourier transforming the phase-modulated light, and generates a second intermediate image by collecting the amplitude-modulated light.
  • phase-modulated light and amplitude-modulated light By using phase-modulated light and amplitude-modulated light, different images can be generated by a common modulation element and optical system, so that the cost can be reduced with a simple configuration.
  • the first intermediate image and the second intermediate image are formed at different positions in the optical axis direction of the first optical system.
  • the modulation element has a first region and a second region that is separate from the first region.
  • the output light is phase-modulated, and in the second region, the light is emitted.
  • the incident light is subjected to amplitude modulation.
  • the modulation element can be divided into two regions and different modulated light can be generated in each region, a simple and compact configuration can be realized.
  • the modulation element may switch between generation of phase-modulated light and generation of amplitude-modulated light at predetermined time intervals.
  • time-division driving for the three colors R, G, and B.
  • the two modulated lights can be generated using the entire area of the modulation element, the number of pixels of the image to be formed is not limited, so that a desired image can be designed.
  • the modulation element is preferably an LCOS that performs phase modulation or amplitude modulation when outgoing light is transmitted or reflected.
  • both phase modulation and amplitude modulation can be realized by one modulation element.
  • an image processing apparatus capable of displaying different images at a plurality of display positions with a simple configuration while suppressing cost.
  • FIG. 1 It is a top view which shows the structure of the image processing apparatus which concerns on a basic form. It is a block diagram which shows the structure of the image processing apparatus shown in FIG. It is a top view which shows the example which applied the image processing apparatus which concerns on a basic form to the head-up display apparatus for vehicles.
  • FIG. 1 is a plan view showing a configuration of an image processing apparatus 10 according to the basic form of the present embodiment.
  • FIG. 2 is a block diagram showing a configuration of the image processing apparatus 10 shown in FIG.
  • the image processing apparatus 10 includes a laser light source 20, an LCOS 30 as a modulation element, a first lens 40 as a first optical system, a first screen 51, and a second screen 52.
  • a second lens 60 as a second optical system, a laser driver 21, an LCOS driver 31, a control unit 70, and a memory 71.
  • the laser light source 20 is a light source that emits laser light in the visible region, and emits light having an intensity corresponding to the amount of current supplied from the laser driver 21.
  • the amount of current supplied from the laser driver 21 is controlled by the control unit 70.
  • LCOS 30 is a reflective LCOS (Liquid Crystal On Silicon), and is a panel having a liquid crystal layer and an electrode layer such as aluminum.
  • the LCOS 30 includes a plurality of pixels in which electrodes for applying an electric field to the liquid crystal layer are regularly arranged.
  • the tilt angle in the thickness direction of the crystal layer in the liquid crystal layer changes due to the change in electric field strength applied to each electrode, and the phase of the transmitted laser light is modulated for each pixel. Further, when light in a specific polarization state is incident from the laser light source 20, the amplitude can be modulated for each pixel in accordance with the tilt angle of the crystal.
  • the change of the phase or amplitude for each pixel is controlled by the LCOS driver 31.
  • An instruction signal corresponding to the image data is sent to the LCOS driver 31 from the control unit 70 that has read the image data stored in the memory 71 in advance, and according to this instruction signal, the LCOS driver 31 outputs the instruction signal for each pixel of the LCOS 30.
  • a change in phase or amplitude is controlled, whereby predetermined phase-modulated light Ip or amplitude-modulated light Ia (FIG. 1) is generated.
  • the LCOS 30 light for phase modulation is irradiated to some pixels from the laser light source 20, and light for amplitude modulation is irradiated to the remaining pixels from the laser light source 20.
  • a pixel in the right half region (first region) in the Y direction is irradiated with laser light for phase modulation
  • the left half region Laser light for amplitude modulation is irradiated to the pixels in (second region).
  • the method of dividing the pixels for phase modulation and the pixels for amplitude modulation is not limited to this.
  • the pixels may be divided in the Z direction or in a staggered pattern. In this way, since the modulation area is divided into two and different modulated light can be generated in each area, a simple and compact configuration can be realized.
  • the LCOS 30 pixels are not divided into pixels for phase modulation and pixels for amplitude modulation, but for all pixels, laser light and phase modulation for phase modulation are performed every predetermined time.
  • the phase-modulated light and the amplitude-modulated light may be generated in time series.
  • two modulated lights can be generated using all the regions of the LCOS 30, and there is no restriction on the number of pixels of the image to be formed, so that a desired image can be designed.
  • the phase-modulated light Ip and the amplitude-modulated light Ia generated by the LCOS 30 are incident on the first lens 40.
  • the first lens 40 is a biconvex positive lens.
  • the incident light is Fourier-transformed as a Fourier transform lens (FT lens), and the incident light is condensed to thereby convert the image light. Generate.
  • This image light forms an image on the first screen 51 as a first intermediate image (hologram image).
  • the first lens 40 condenses the amplitude-modulated light Ia as a condensing lens and forms image light as a second intermediate image (hologram image) on the second screen 52.
  • the first screen 51 and the second screen 52 are orthogonal to the optical axis 40c of the first lens 40 and are provided at different positions in the direction of the optical axis 40c.
  • the first lens 40 is replaced with a lens having a positive refractive power of another shape or a plurality of lenses.
  • An optical system having a positive refractive power may be used.
  • a transmissive LCOS or other modulation element may be used instead of the LCOS 30.
  • the first intermediate image formed on the first screen 51 and the second intermediate image formed on the second screen 52 are respectively formed with virtual images at different positions V1 and V2 by the second lens 60 as a projection lens. Can visually recognize the virtual image projected at the positions V1 and V2 in the eye box E (a range in which the virtual image can be visually recognized).
  • the optical axis 60c of the second lens 60 is on an extension line of the optical axis 40c of the first lens 40, and the positions V1 and V2 at which virtual images are formed are the optical axis 40c of the first lens 40 and the second lens 60. In the direction of the optical axis 60c, and also in the YZ plane. If the virtual image corresponding to the phase-modulated light and the virtual image corresponding to the amplitude-modulated light can be formed at different positions, the second lens 60 may be replaced with a reflective element such as a mirror or a plurality of lenses.
  • image light based on phase-modulated light and amplitude-modulated light can be formed as virtual images at different positions using the common LCOS 30, the first lens 40, and the second lens 60, respectively. Therefore, since the number of constituent materials is not increased, it is possible to display different information at a plurality of display positions with a simple configuration while suppressing costs.
  • FIG. 3 is a plan view showing an example in which the image processing apparatus according to the basic form is applied to a head-up display device 110 for a vehicle.
  • the laser light source 120, the LCOS 130, the first lens 140, the first screen 151, the second screen 152, the first projection mirror 161, and the second projection mirror 162 in the head-up display device 110 shown in FIG. 1 and FIG. 2 respectively correspond to the laser light source 20, the LCOS 30, the first lens 40, the first screen 51, the second screen 52, and the second lens 60 of the image processing apparatus.
  • the generated image light is reflected and enlarged by the first projection mirror 161 and the second projection mirror 162, and projected onto the display area of the windshield of the vehicle. This image light is reflected toward the driver in the display area, and at the same time, a virtual image is formed in front of the windshield.
  • the head-up display device 110 includes a case (not shown), and in this case, as shown in FIG. 3, a laser light source 120, an LCOS 130, and a first lens 140 (first optical system) are placed on an optical base 111.
  • the laser light source 120 is provided with a heat-dissipating cooling unit 121 that dissipates heat generated from the laser light source 120 so as to be adjacent thereto.
  • the LCOS 130 is held in a positioning holder 131 fixed to the optical base 111, and light emitted from the laser light source 120 enters the optical surface 130a at a predetermined incident angle.
  • the LCOS 130 is provided with a heat radiation cooling unit 132 that dissipates heat generated by the LCOS 130.
  • the phase-modulated light Ip and the amplitude-modulated light Ia are generated as in the LCOS 30.
  • the first lens 140 is held by a lens holder 141 fixed to the optical base 111, and the phase-modulated light Ip and the amplitude-modulated light Ia generated by the LCOS 130 are incident thereon.
  • the first lens 140 is a biconvex positive lens, and the phase-modulated light Ip is Fourier-transformed and condensed as a Fourier transform lens, whereby a modulated light beam M1 is generated.
  • the first lens 140 condenses the amplitude-modulated light Ia as a condensing lens and generates a modulated light beam M2.
  • the modulated light beams M1 and M2 are reflected by a light transmission mirror 142 provided on the optical base 111.
  • the reflected light from the light transmission mirror 142 passes through apertures 143 a and 144 a provided in the light shielding walls 143 and 144 fixed to the optical base 111 in order, and enters the first intermediate mirror 145.
  • the modulated light beams M 1 and M 2 are sequentially reflected by the first intermediate mirror 145 and the second intermediate mirror 146, pass through the aperture 147 a of the light shielding wall 147 fixed to the optical base 111, and undergo phase modulation on the screen 151.
  • a hologram image is generated by the first-order diffracted light of the light Ip, and a real image is formed on the screen 152 by imaging the amplitude-modulated light Ia.
  • the first-order diffracted light light components that do not contribute to the image formation of the hologram image and zero-order diffracted light are shielded by the light shielding walls 143, 144, and 147.
  • the light transmitted through the screens 151 and 152 becomes divergent projection light P1 and P2, respectively, and passes through the second aperture 144b of the light shielding wall 144 and enters the first projection mirror 161.
  • the reflecting surface 161a of the first projection mirror 161 is a concave mirror (magnifying mirror), and the projection lights P1 and P2 including the hologram image formed on the screens 151 and 152 are magnified and reflected by the first projection mirror 161, respectively. . These reflected lights are incident on the second projection mirror 162, respectively.
  • the reflecting surface 162a of the second projection mirror 162 is also a concave mirror (magnifying mirror), and the incident projection lights P1 and P2 are further magnified and reflected and projected onto different positions in the display area of the windshield of the vehicle.
  • this display area functions as a semi-reflective surface, the incident image light is reflected toward the driver and a virtual image is formed in front of the windshield. By viewing the virtual image in front of the windshield, it appears to the driver that various types of information are displayed in front of the steering wheel.
  • phase modulation is performed on a part of the emitted light from the laser light source 20 to generate phase modulated light, and amplitude modulation is applied to light that has not been subjected to phase modulation in the emitted light. Then, the amplitude-modulated light is generated, and in the first lens 40, the phase-modulated light is Fourier-transformed to collect the amplitude-modulated light.
  • each image can be displayed at an optimal distance according to the content of the image, so that visibility can be improved and the burden on the user's eyes is reduced. Can be reduced. Further, by adjusting the display position of the image, it is possible to display content in consideration of human visual characteristics.
  • the LCOS 30 can be used to generate phase-modulated light and amplitude-modulated light, it is possible to display different images at different positions while reducing costs with a simple configuration.
  • the image processing device is useful for a head-up display device for a vehicle, and is suitable for displaying different images at a plurality of display positions.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)

Abstract

Un dispositif de traitement d'image comprend : une source de faisceau laser; un élément de modulation (30) pour générer une lumière modulée en phase par modulation de la phase d'une partie de la lumière émise par la source de lumière laser tout en générant une lumière modulée en amplitude par modulation de l'amplitude de la partie de la lumière d'émission non modulée en phase; un premier système optique (40) destiné à appliquer une transformation de Fourier à la lumière modulée en phase, et à recueillir la lumière modulée en amplitude; et un second système optique (60) destiné à générer une première image (V1) sur la base de la transformation de Fourier appliquée à la lumière modulée en phase par le premier système optique (40), et à générer une seconde image (V2) sur la base de la lumière modulée en amplitude recueillie par le premier système optique (40). Le dispositif de traitement d'image peut afficher les différentes images (V1, V2) au niveau d'une pluralité de positions d'affichage tout en minimisant les coûts par une configuration simple.
PCT/JP2015/079466 2014-12-26 2015-10-19 Dispositif de traitement d'image WO2016103869A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2014-266368 2014-12-26
JP2014266368 2014-12-26

Publications (1)

Publication Number Publication Date
WO2016103869A1 true WO2016103869A1 (fr) 2016-06-30

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2018056198A1 (fr) * 2016-09-21 2018-03-29 日本電気株式会社 Système d'affichage
WO2018056194A1 (fr) * 2016-09-21 2018-03-29 日本電気株式会社 Système de projection
CN113615167A (zh) * 2019-03-15 2021-11-05 杜比实验室特许公司 双调制激光投影系统和方法

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007506988A (ja) * 2003-06-26 2007-03-22 リソ ナショナル ラボラトリー 複数の位相コントラストフィルタによる所望波面の生成
JP2008058963A (ja) * 2006-08-28 2008-03-13 Samsung Electro Mech Co Ltd スペックル除去回折型光変調システム
JP2008180758A (ja) * 2007-01-23 2008-08-07 Seiko Epson Corp 表示装置
JP2009025462A (ja) * 2007-07-18 2009-02-05 Canon Inc 光走査装置及び走査型画像表示装置

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007506988A (ja) * 2003-06-26 2007-03-22 リソ ナショナル ラボラトリー 複数の位相コントラストフィルタによる所望波面の生成
JP2008058963A (ja) * 2006-08-28 2008-03-13 Samsung Electro Mech Co Ltd スペックル除去回折型光変調システム
JP2008180758A (ja) * 2007-01-23 2008-08-07 Seiko Epson Corp 表示装置
JP2009025462A (ja) * 2007-07-18 2009-02-05 Canon Inc 光走査装置及び走査型画像表示装置

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2018056198A1 (fr) * 2016-09-21 2018-03-29 日本電気株式会社 Système d'affichage
WO2018056194A1 (fr) * 2016-09-21 2018-03-29 日本電気株式会社 Système de projection
JPWO2018056198A1 (ja) * 2016-09-21 2019-06-24 日本電気株式会社 表示システム
JPWO2018056194A1 (ja) * 2016-09-21 2019-07-11 日本電気株式会社 投射システム
US11172179B2 (en) 2016-09-21 2021-11-09 Nec Corporation Projection system
US11237390B2 (en) 2016-09-21 2022-02-01 Nec Corporation Display system
CN113615167A (zh) * 2019-03-15 2021-11-05 杜比实验室特许公司 双调制激光投影系统和方法
CN113615167B (zh) * 2019-03-15 2023-12-05 杜比实验室特许公司 双调制激光投影系统和方法

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