WO2022024965A1 - 表示装置 - Google Patents

表示装置 Download PDF

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Publication number
WO2022024965A1
WO2022024965A1 PCT/JP2021/027464 JP2021027464W WO2022024965A1 WO 2022024965 A1 WO2022024965 A1 WO 2022024965A1 JP 2021027464 W JP2021027464 W JP 2021027464W WO 2022024965 A1 WO2022024965 A1 WO 2022024965A1
Authority
WO
WIPO (PCT)
Prior art keywords
diffusion member
laser beam
light source
display device
incident position
Prior art date
Application number
PCT/JP2021/027464
Other languages
English (en)
French (fr)
Japanese (ja)
Inventor
義弘 橋塚
Original Assignee
日本精機株式会社
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 日本精機株式会社 filed Critical 日本精機株式会社
Priority to JP2022540276A priority Critical patent/JPWO2022024965A1/ja
Publication of WO2022024965A1 publication Critical patent/WO2022024965A1/ja

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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
    • B60K35/10—Input arrangements, i.e. from user to vehicle, associated with vehicle functions or specially adapted therefor
    • 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
    • B60K35/20—Output arrangements, i.e. from vehicle to user, associated with vehicle functions or specially adapted therefor
    • B60K35/21—Output arrangements, i.e. from vehicle to user, associated with vehicle functions or specially adapted therefor using visual output, e.g. blinking lights or matrix displays
    • B60K35/22—Display screens
    • 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
    • B60K35/20—Output arrangements, i.e. from vehicle to user, associated with vehicle functions or specially adapted therefor
    • B60K35/21—Output arrangements, i.e. from vehicle to user, associated with vehicle functions or specially adapted therefor using visual output, e.g. blinking lights or matrix displays
    • B60K35/23—Head-up displays [HUD]
    • 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
    • B60K35/80—Arrangements for controlling instruments
    • B60K35/81—Arrangements for controlling instruments for controlling 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
    • G02B27/01—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
    • G02B27/48—Laser speckle optics
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B21/00—Projectors or projection-type viewers; Accessories therefor
    • G03B21/14—Details
    • G—PHYSICS
    • 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
    • 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
    • B60K35/20—Output arrangements, i.e. from vehicle to user, associated with vehicle functions or specially adapted therefor
    • B60K35/21—Output arrangements, i.e. from vehicle to user, associated with vehicle functions or specially adapted therefor using visual output, e.g. blinking lights or matrix displays
    • B60K35/23—Head-up displays [HUD]
    • B60K35/234—Head-up displays [HUD] controlling the brightness, colour or contrast of virtual images depending on the driving conditions or on the condition of the vehicle or the driver

Definitions

  • This disclosure relates to display devices such as head-up displays.
  • the light source unit is set in a current band where the light output is stable by prolonging the non-lighting time of the light source unit by PWM drive. While driving, control is performed to reduce the brightness.
  • a display device using a laser beam as a light source it is known that the content of originally uniform surface brightness becomes non-uniform due to the coherent property of the laser beam.
  • a method of multiplexing laser light spatially or temporally is adopted.
  • a technique for removing speckles by rotating or swinging a diffusion member provided on an optical path of a laser beam is known (see, for example, Patent Document 1).
  • the lighting time is shorter on the low brightness side, so that it is not possible to secure the number of multiplexings required for ensuring the image quality (speckle removal) per unit time, and as a result, the laser.
  • speckles will become apparent due to the coherent nature of light.
  • the purpose of this disclosure is to provide a display device capable of appropriately removing speckles even at low brightness.
  • a light source unit that emits laser light and A diffusing member arranged on the optical path of the laser beam emitted by the light source unit and diffusing the laser beam,
  • the diffusion member rotating part that rotates the diffusion member
  • a display device including a light source unit and a control unit that controls the diffusion member rotating unit.
  • the control unit Luminance control means that controls the brightness of laser light based on PWM drive, It is characterized by comprising a rotation speed control means for increasing the rotation speed of the diffusion member according to a decrease in the duty ratio of the PWM drive.
  • a light source unit that emits laser light and A diffusing member arranged on the optical path of the laser beam emitted by the light source unit and diffusing the laser beam
  • the diffusion member rotating part that rotates the diffusion member
  • a display device including a light source unit and a control unit that controls the diffusion member rotating unit. Further provided with a diffuser member moving portion that moves the incident position of the laser beam with respect to the diffuser member in the radial direction of the diffuser member.
  • the control unit Luminance control means that controls the brightness of laser light based on PWM drive, It is characterized by comprising an incident position control means for moving the incident position of the laser beam with respect to the diffusion member toward the outer peripheral side according to a decrease in the duty ratio of the PWM drive.
  • the diffusion member is characterized by having an unevenness pattern in which the unevenness pitch becomes narrower toward the outer peripheral side.
  • the diffusing member is characterized in that it is arranged between the light source unit and a lens group that refracts the laser beam.
  • speckles can be appropriately removed even at low brightness.
  • FIG. 1 is a diagram showing a schematic configuration of a display device according to an embodiment of the present invention.
  • the display device 1 shown in FIG. 1 is incorporated in a vehicle head-up display using a laser beam as a light source.
  • the display light emitted from the display device 1 is projected onto the translucent member (for example, a windshield or a combiner of a vehicle), and a virtual image of the display light is displayed in front of the translucent member.
  • What is displayed as a virtual image is, for example, a number, a character, or a graphic representing instrument information such as a vehicle traveling speed, a vehicle warning, a vehicle function operating state such as various surrounding sensors, and route guidance.
  • the display device 1 has a light source unit 2 that emits laser light (red laser light R, green laser light G, blue laser light B), a rotational diffusion unit 3 that diffuses the laser light emitted from the light source unit 2, and rotation.
  • a lens group 4 that refracts the laser light that has passed through the diffuser 3, a diffuser plate 5 that diffuses the laser light that has passed through the lens group 4, and a liquid crystal panel 6 that forms an image using the laser light that has passed through the diffuser plate 5 as a backlight. It includes a light source unit 2, a rotation diffusion unit 3, and a control unit 7 that controls the liquid crystal panel 6.
  • the lens group 4 of the present embodiment includes a collimator lens 41, a fly-eye lens 42, a condenser lens 43, and a field lens 44, but the configuration of the lens group 4 is not limited to this.
  • a liquid crystal panel 6 that forms an image using a laser beam as a backlight is exemplified, but a MEMS method using a micromirror device by MEMS technology, an LCOS method using a reflective liquid crystal panel, and a digital micromirror device can be used.
  • the DMD method to be used may be used.
  • the rotational diffusion unit 3 includes a disk-shaped diffusion member 31, a rotary motor 32 (diffusion member rotating unit) that rotates the diffusion member 31 with the center of the circle of the diffusion member 31 as a rotation axis, and a diffusion member.
  • the moving motor 33 (diffusing member moving portion) that moves the incident position of the laser beam with respect to the diffusing member 31 in the radial direction of the diffusing member 31.
  • the moving motor 33 can be configured by using a servomotor that moves the rotary motor 32 forward and backward according to the rotation of the feed screw 33a. For example, by detecting the moving position of the rotary motor 32 with the stroke sensor and feeding it back to the control unit 7, it is possible to accurately control the positions of the rotary motor 32 and the diffusion member 31. Further, a stepping motor may be adopted as the moving motor 33, and the moving distance may be finely set by the number of drive steps.
  • FIG. 2 is a schematic diagram showing the uneven pitch of the diffusion member.
  • 200 shows a plan view of the diffusion member 31, and 202 shows a cross-sectional view of the diffusion member 31 along the radial direction. Further, in the cross-sectional view shown by 202, the X1 side in the X direction corresponds to the inner peripheral side, and the X2 side corresponds to the outer peripheral side.
  • the diffusion member 31 has a concavo-convex pattern including a large number of concavo-convex on at least one surface. This uneven pattern is formed so that the uneven pitch is large on the inner peripheral side (small turning radius side) and the uneven pitch is small on the outer peripheral side (large turning radius side).
  • the incident laser light is diffused even in the rotation stopped state, but in the state of being rotated by the rotating motor 32, the laser light is multiplexed to reduce the speckle. can get. Further, when the rotation speed of the diffusion member 31 is increased, the number of times the laser beam crosses the unevenness (the number of times per unit time) increases, so that the number of multiplexings can be increased and the speckle reduction effect can be enhanced.
  • the incident position of the laser light with respect to the rotating diffuser member 31 is moved to the outer peripheral side of the diffuser member 31, the circumferential distance of the laser light incident position increases, and the laser beam becomes uneven while the diffuser member 31 rotates once. Since the number of crossings increases, the number of multiplexings can be increased to further enhance the speckle reduction effect. Further, when the incident position of the laser light on the rotating diffusion member 31 is moved to the outer peripheral side of the diffusion member 31, the uneven pitch of the laser light incident position becomes smaller and the number of times the laser light crosses the unevenness increases, so that the number of multiplexings is increased. Can be increased to further enhance the speckle reduction effect.
  • the control unit 7 has a luminance control means for controlling the brightness of the laser beam emitted by the light source unit 2 and a rotation number control for controlling the rotation speed of the diffusion member 31, as a functional configuration realized by cooperation between hardware and software.
  • a means and an incident position control means for controlling the incident position of the laser beam with respect to the diffusion member 31 are provided.
  • FIG. 3 is a graph showing the current-light output characteristics of the light source unit.
  • the horizontal axis represents the current I
  • the vertical axis represents the optical output L
  • the curve relating to the current-optical output characteristic of the light source unit 2 is shown by a solid line.
  • the current bands A and B are shown in the frame of the dotted line.
  • FIG. 4 is a diagram showing a PWM control waveform of the light source unit.
  • the luminance control means avoids the current band A by increasing the time of turning off in time by PWM drive, and is stable using the current band B in which a stable optical output L can be obtained. Achieve low brightness. That is, the luminance control means realizes stable low luminance by using the current band B in which the stable optical output L can be obtained by lowering the duty ratio of the PWM drive.
  • the lighting time of the laser light emitting element is shortened at low brightness, so that the number of multiplexings by the diffusion member 31 is reduced. Therefore, in this embodiment, by having the configuration described below, stable low brightness is used using the current band B in which a stable optical output L can be obtained without significantly reducing the number of multiplexings by the diffusion member 31. To realize.
  • FIG. 5 is a graph showing the relationship between the PWM duty and the rotation speed of the diffusion member.
  • the duty ratio of PWM drive (denoted as “Duty”) is taken on the horizontal axis
  • the rotation speed is taken on the vertical axis
  • the curve of the relationship between the PWM duty and the rotation speed of the diffusion member 31 is shown. There is.
  • the rotation speed control means increases the rotation speed of the diffusion member 31 according to the decrease in the duty ratio of the PWM drive.
  • FIG. 6 is a graph showing the relationship between the PWM duty and the laser incident radius of the diffusion member.
  • the PWM drive duty ratio (denoted as “Duty”) is taken on the horizontal axis
  • the incident position r is taken on the vertical axis
  • the relationship between the PWM duty and the laser incident radius (incident position r) of the diffusion member is taken. A curve is shown.
  • the incident position control means moves the incident position of the laser beam with respect to the diffusion member 31 to the outer peripheral side according to the decrease in the duty ratio of the PWM drive.
  • the linear velocity V at the laser beam incident position of the diffuser member 31 r ⁇ (r: radius, ⁇ : angular velocity)
  • the radius r becomes larger and the linear velocity V increases, so that the number of times the laser light crosses the unevenness of the diffusing member 31 increases, and the number of multiplexings is further increased. Will be possible.
  • the diffusion member 31 is formed so that the average unevenness pitch becomes narrower toward the outer peripheral side, the unevenness pitch of the diffusion member 31 becomes narrower even at the same linear velocity V that increases multiplexing. As a result, the number of times the laser beam crosses the unevenness of the diffusing member 31 increases, and the number of multiplexings can be further increased.
  • the display device 1 of the present embodiment optimally combines the above-mentioned characteristic configurations (rotation speed control means, incident position control means, and uneven pitch of the diffusion member 31) to visually recognize the speckle even at low brightness. It enables stable image expression with low color balance and flicker.
  • the light source unit 2 that emits the laser beam
  • the diffuser member 31 that is arranged on the optical path of the laser beam emitted by the light source unit 2 and diffuses the laser beam
  • the rotary motor that rotates the diffuser member 31.
  • a display device 1 including a light source unit 2 and a control unit 7 for controlling a light source unit 2 and a rotary motor 32.
  • the control unit 7 includes a luminance control means for controlling the luminance of a laser beam based on a PWM drive, and a PWM. Since it is provided with a rotation speed control means for increasing the rotation speed of the diffusion member 31 according to a decrease in the duty ratio of the drive, it is possible to increase the number of multiplexings and appropriately remove the speckle even at low brightness. can.
  • the display device 1 further includes a moving motor 33 that moves the incident position of the laser light with respect to the diffusion member 31 in the radial direction of the diffusion member 31, and the control unit 7 further includes a diffusion member according to a decrease in the duty ratio of the PWM drive. Since the incident position control means for moving the incident position of the laser beam with respect to 31 to the outer peripheral side is provided, the speckle can be appropriately removed by further increasing the number of multiplexings even at low brightness.
  • the diffusion member 31 has an unevenness pattern in which the unevenness pitch becomes narrower toward the outer peripheral side, the number of multiplexings at low brightness can be further increased to appropriately remove speckles.
  • the diffusing member 31 is arranged between the light source unit 2 and the lens group 4 that refracts the laser light, the incident area of the laser light on the diffusing member 31 is suppressed, and the diffusing member 31 and the rotational diffusing unit 3 are arranged. It is possible to avoid the increase in size.
  • the vehicle head-up display into which the display device 1 is incorporated may include an optical sensor (external light detection unit) that detects the brightness of the surrounding environment.
  • the vehicle head-up display in which the display device 1 is incorporated may be configured to acquire the brightness of the surrounding environment from the outside.
  • the control unit 7 controls the brightness of the laser beam by fixing the PWM duty ratio to 100 and lowering the current value to control the brightness of the surrounding environment. Only when the value is darker than a predetermined value, the current band B is obtained by avoiding the current band A and obtaining a stable optical output L by increasing the time for turning off the luminance control means by PWM drive. May be used to output stable low brightness.
  • Display device 2 Light source 3 Rotating diffuser 31 Diffusing member 32 Rotating motor 33 Moving motor 33a Feed screw 4 Lens group 41 Collimator lens 42 Fly eye lens 43 Condenser lens 44 Field lens 5 Diffusing plate 6 Liquid crystal panel 7 Control unit

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Computer Hardware Design (AREA)
  • Theoretical Computer Science (AREA)
  • Projection Apparatus (AREA)
  • Liquid Crystal (AREA)
PCT/JP2021/027464 2020-07-30 2021-07-26 表示装置 WO2022024965A1 (ja)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2022540276A JPWO2022024965A1 (enrdf_load_stackoverflow) 2020-07-30 2021-07-26

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JP2020129278 2020-07-30
JP2020-129278 2020-07-30

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Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63100461A (ja) * 1986-10-17 1988-05-02 Nikon Corp 照明装置
JPH06208089A (ja) * 1992-07-29 1994-07-26 Texas Instr Inc <Ti> コヒーレント光を用いる無スペックル・ディスプレイ装置
JPH09243964A (ja) * 1996-03-14 1997-09-19 Sony Corp 露光照明装置
JP2015087595A (ja) * 2013-10-31 2015-05-07 アルプス電気株式会社 画像処理装置
WO2015064496A1 (ja) * 2013-10-31 2015-05-07 アルプス電気株式会社 画像処理装置
JP2016145938A (ja) * 2015-02-09 2016-08-12 アルプス電気株式会社 画像処理装置
JP2016173476A (ja) * 2015-03-17 2016-09-29 アルプス電気株式会社 画像投影装置

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63100461A (ja) * 1986-10-17 1988-05-02 Nikon Corp 照明装置
JPH06208089A (ja) * 1992-07-29 1994-07-26 Texas Instr Inc <Ti> コヒーレント光を用いる無スペックル・ディスプレイ装置
JPH09243964A (ja) * 1996-03-14 1997-09-19 Sony Corp 露光照明装置
JP2015087595A (ja) * 2013-10-31 2015-05-07 アルプス電気株式会社 画像処理装置
WO2015064496A1 (ja) * 2013-10-31 2015-05-07 アルプス電気株式会社 画像処理装置
JP2016145938A (ja) * 2015-02-09 2016-08-12 アルプス電気株式会社 画像処理装置
JP2016173476A (ja) * 2015-03-17 2016-09-29 アルプス電気株式会社 画像投影装置

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