WO2022270343A1 - Affichage tête haute - Google Patents

Affichage tête haute Download PDF

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Publication number
WO2022270343A1
WO2022270343A1 PCT/JP2022/023723 JP2022023723W WO2022270343A1 WO 2022270343 A1 WO2022270343 A1 WO 2022270343A1 JP 2022023723 W JP2022023723 W JP 2022023723W WO 2022270343 A1 WO2022270343 A1 WO 2022270343A1
Authority
WO
WIPO (PCT)
Prior art keywords
light source
display
light
control unit
head
Prior art date
Application number
PCT/JP2022/023723
Other languages
English (en)
Japanese (ja)
Inventor
さやか 水野
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
Publication of WO2022270343A1 publication Critical patent/WO2022270343A1/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
    • 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
    • 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
    • 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
    • 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
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/10—Controlling the intensity of the light
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B47/00—Circuit arrangements for operating light sources in general, i.e. where the type of light source is not relevant
    • H05B47/10—Controlling the light source
    • H05B47/17—Operational modes, e.g. switching from manual to automatic mode or prohibiting specific operations

Definitions

  • the present invention relates to head-up displays.
  • Patent Document 1 and Patent Document 2 As conventional head-up displays, configurations disclosed in Patent Document 1 and Patent Document 2 are known.
  • Patent Document 1 discloses a configuration using a light source group (11), and Patent Document 2 discloses a configuration using a light source unit (11).
  • the inventors of the present application have found that the conventional configuration has room for improvement in resistance to changes in the external environment of the head-up display.
  • An object of the present invention is to provide a head-up display with improved resistance to changes in the external environment, focusing on the above-mentioned problems.
  • the head-up display includes: a light source that lights with a first luminance and a second luminance that is lower than the first luminance; A first mode for controlling the light source to emit light at the first luminance in a first waveform shape, and a second mode for controlling the light source to emit light at the second luminance in a second waveform shape.
  • a control unit that controls the light source in two modes; The control unit comprises a first chromaticity correction value that is the chromaticity correction value in the first mode; The light source is controlled based on a second chromaticity correction value that is a chromaticity correction value in the second mode and is different from the first chromaticity correction value.
  • the head-up display includes: a light source that emits light when a predetermined current flows; a control unit that controls the light source; a temperature measuring unit for measuring ambient temperature; with The head-up display, wherein the controller controls the light source based on different current limit values according to the temperature.
  • the head-up display includes: a light source that emits light when a predetermined current flows; a control unit that controls the light source; with The control unit controls the light source based on a predetermined current limit value, The head-up display, wherein the current limit value is a value including a low-temperature side margin.
  • FIG. 2 is a diagram showing the configuration of a projector 21;
  • HUD head-up display
  • the directions F, B, L, R, U, and D shown in the drawings correspond to the front, rear, left, right, up, and down directions of the vehicle C, respectively.
  • the left-right direction is sometimes called a direction X
  • the up-down direction is called a direction Y
  • the front-back direction is sometimes called a direction Z.
  • some of the reference numerals assigned to the illustrated members are omitted.
  • the head-up display 1 can be mounted below a windshield WS provided in a vehicle C, for example.
  • the HUD 1 displays a virtual image V by projecting the display light Li representing the vehicle information onto the windshield WS (reflecting and transmitting member), which has a free-form surface shape inclined so that the front end of the vehicle is lowered.
  • the HUD 1 emits display light Li obliquely upward in the rearward direction of the vehicle.
  • the display light Li emitted to the HUD 1 is reflected by the windshield WS.
  • a user for example, an occupant of the vehicle C
  • viewing the display light Li reflected by the windshield WS at the viewpoint EP can visually recognize the projected virtual image V as a display image floating behind the windshield WS.
  • the virtual image V includes vehicle information such as speed and engine speed, route guidance displays such as turn-by-turn and maps, warning displays such as blind spot monitors and speed limit warnings, etc. Information that requires attention is displayed. This provides a driving environment with reduced viewpoint movement and eye focal length adjustments.
  • the virtual image V includes characters and icons indicating such information, as well as a background portion, and has, for example, a rectangular shape when viewed from above by the occupant.
  • the HUD 1 operates mainly in two modes.
  • One is a display mode in which the HUD 1 projects display light Li onto the windshield WS as shown in FIG. 1 so that a virtual image V can be visually recognized from the viewpoint EP.
  • the other is a pause mode (parking mode) in which the HUD 1 does not project the display light Li onto the windshield WS and the virtual image V cannot be visually recognized from the viewpoint EP.
  • the HUD 1 in the parking mode which does not project the display light Li onto the windshield WS, receives external light (mainly sunlight) incident on the HUD 1 from the direction of the windshield WS based on the principle of backward movement of light rays. It is located at a position where there is no reflection in the direction (the direction in which the display section optically exists).
  • HUD 1 rotates mirror 30 according to the configuration described below.
  • the HUD 1 in the display mode can change the optical path of the display light Li by the configuration described later in order to adjust the height of the viewpoint EP at which the virtual image V can be visually recognized.
  • the shorter display light Ls in the display mode, the HUD 1 projects the display light Li toward a relatively lower portion of the windshield WS to project a virtual image V.
  • the HUD 1 projects the display light Li to a relatively upper portion of the windshield WS to project a virtual image V.
  • the center display light Lc projects a virtual image V through the two display optical paths.
  • the HUD 1 includes a control section, a housing, a display section 20, and a mirror 30.
  • the control unit includes storage units such as ROM and RAM (not shown) used for storage of predetermined programs and various data and storage areas during calculation, a CPU for performing arithmetic processing according to the predetermined program, an input/output interface, and the like.
  • the provided microcomputer can be applied.
  • the control unit is electrically connected to the display unit 20 , the power unit, and electronic equipment outside the HUD 1 .
  • the control unit generates an image to be displayed on the display unit 20, controls the display of the display unit 20, controls the illuminance of the display unit 20, and Controls the rotation of mirror 30 .
  • the control section may be mounted on a control board configured by a printed wiring board.
  • the housing is a housing that fixes the members provided in the HUD 1 by known means such as adhesion, fitting, and screwing.
  • the housing fixes the display unit 20, the mirror 30, and the control unit (control board).
  • a user of the vehicle C can visually recognize the inside of the HUD 1 only through the window portion 111 .
  • the display unit 20 is a member that emits display light Li.
  • the light is emitted in direction F.
  • a member for emitting the display light Li for example, a structure using a TFT liquid crystal module, a structure using an organic EL, a projector using a DMD (Digital Micro-mirror Device), or the like can be applied.
  • the display unit 20 is configured to have a backlight unit and a liquid crystal display element connected to the control unit in a fixed state, and a liquid crystal display element for displaying information under the control of the control unit. emits display light Li when illuminated by illumination light emitted from a backlight unit whose blinking is controlled by the control unit.
  • the effects of the configuration of the present disclosure can be exhibited as long as the configuration is capable of emitting display light, even if the configuration is not exemplified.
  • the display unit 20 of the present disclosure has, for example, a screen and a projector 21 that projects projection light onto the screen.
  • the projector 21 projects projection light by a field sequential method, and has a red light source 21r, a green light source 21g, a blue light source 21b, a dichroic mirror 21m, a DMD 21d, a prism 21p, and a projection lens section 21s.
  • the red light source 21r, the green light source 21g, and the blue light source 21b are composed of LEDs (Light Emitting Diodes), and sequentially light up according to signals transmitted from the electrically connected control means 40. When lit, each color light beam is emitted toward the dichroic mirror 21m positioned above each light source in the drawing. Instead of using LEDs of each color, it is possible to use white LEDs with transmissive color filters of each color provided in the emission direction.
  • the dichroic mirror 21m is a reflection-transmission member capable of transmitting or reflecting light in a predetermined wavelength range, and transmits/reflects each color light beam to the DMD 21d.
  • the DMD 21d which is a digital micromirror device, is an optical modulation element that reflects light in a predetermined direction by changing the angles of minute mirrors arranged in a matrix on the incident plane according to control signals from the control means 40. be.
  • the light rays of each color transmitted/reflected by the dichroic mirror 21m are reflected in the direction of the prism 21p and other directions that do not affect the display of the virtual image V according to the angle of the mirror.
  • the prism 21p is a prism held so as to transmit each color light beam incident on the DMD 21d and reflect each color light beam reflected from the DMD 21d toward the projection lens section 21s.
  • the projection lens section 21s is composed of at least one lens, and expands and emits the light beam reflected by the prism 21p as illumination light.
  • the screen is a transmissive screen that can be composed of a microlens array, a diffusion plate, etc., and is a member that diffuses and transmits light toward the mirror 30 .
  • the screen emits display light Li by being illuminated by illumination light.
  • the mirror 30 reflects the display light Li.
  • the mirror 30 has, for example, a concave free-form curved surface that reflects the display light Li, and a mirror surface 30b is formed on the concave surface of the substrate 30a by vapor deposition (aluminum vapor deposition, etc.) or sputtering.
  • the mirror 30 magnifies and reflects the display light Li.
  • a hard synthetic resin or inorganic glass can be applied to the base material 30a of the mirror 30 .
  • it is desirable that the mirror surface 30b have a shape that cancels out the distortion of the virtual image V that is assumed to occur on the windshield WS due to the free-form surface shape.
  • the mirror 30 is rotatably held with the axis A as the center of rotation.
  • the mirror 30 has rotating shafts provided at the left and right ends of the center, for example, which are held on bearings provided in the housing or the like, and contacts and the like are moved by a power section (mechanism using a motor and a lead screw).
  • a power section (mechanism using a motor and a lead screw).
  • the HUD 1 has a temperature measurement unit (not shown).
  • the temperature measurement unit is a sensor that can measure the ambient temperature, and various methods such as a thermistor and a thermocouple can be used. Further, the temperature measurement unit can measure, for example, the temperature of the light source, the ambient temperature of the light source, the ambient temperature of the vehicle C, the temperature of the control unit, the ambient temperature of the control unit, and the like. In the following description, a thermistor that measures the temperature of the light source is taken as an example of the temperature measurement unit.
  • the display performance may change due to changes in the external environment.
  • an external environment change that can change the display performance is, for example, a decrease in the brightness of the surroundings.
  • a conventional head-up display for example, as shown in Patent Document 1, when the brightness of the surroundings decreases, it shifts to a low-brightness mode in which the brightness of the light source is lowered.
  • driving waveform for example, a configuration is known in which a rectangular wave is changed to a triangular wave.
  • a light source that lights with a first luminance and a second luminance that is lower than the first luminance;
  • a second mode that controls the light source with a control unit that controls the with The control unit A first chromaticity correction value that is a chromaticity correction value in the first mode;
  • a head-up display that controls a light source based on a second chromaticity correction value that is a chromaticity correction value in the second mode and is different from the first chromaticity correction value has been invented.
  • the chromaticity correction value is a value for correcting chromaticity when the control unit controls the light source, and may be stored in the control unit, for example.
  • the controller changes the chromaticity of the display (light source) according to the change in this value.
  • This chromaticity correction value is stored in the control unit as a value adjusted for each individual device by a calibration process at the manufacturing stage of the device. It is preferable that the chromaticity correction value can be set in a storage means such as a memory in the control unit by calibration software.
  • the chromaticity correction value may be represented by X, Y coordinates on an XY chromaticity diagram in the XYZ color system defined by the International Commission on Illumination (CIE).
  • the control unit Based on the chromaticity correction values indicated by the X and Y coordinates, the control unit refers to a predetermined lookup table or the like, and controls the light source so as to achieve accurate chromaticity. Note that the mode of the chromaticity correction value is not limited to this.
  • the display performance may change due to changes in the external environment.
  • the inventors have found that a change in the external environment that can cause a change in display performance is, for example, a decrease in temperature.
  • Patent Document 1 In conventional head-up displays, configurations using LED light sources are known, as shown in Patent Document 1, for example. The inventors have found that in this configuration, the current flowing through the light source fluctuates due to a decrease in temperature, which may lead to deterioration in display quality (flicker, luminance fluctuation, etc.).
  • the inventor a light source that emits light when a predetermined current flows; a control unit that controls the light source; a temperature measuring unit for measuring ambient temperature; with The head-up display, wherein the controller controls the light source based on different current limit values according to the temperature. invented.
  • the current limit value is a set value that is set for each individual head-up display.
  • the current limit value represents the maximum value of current flowing through the light source, and is a value for preventing unnecessary large current from flowing into the light source and unnecessary high display brightness.
  • the controller stores this current limit value and controls lighting of the light source based on this value.
  • the current limit value is stored, for example, as numerical data representing the current, and the control unit refers to this current limit value to control the light source so that the brightness is within the appropriate range.
  • the mode of the current limit value is not limited to this.
  • the control unit can control the light source with an appropriate amount of drive current for each temperature. Specifically, in a low temperature range, the current required to turn on the light source increases, so a higher current limit value is adopted.
  • the head-up display can display with desired display performance. As a result, it achieves to provide a head-up display with improved resistance to changes in the external environment.
  • the inventor a light source that emits light when a predetermined current flows; a control unit that controls the light source; with The control unit controls the light source based on a predetermined current limit value, The head-up display, wherein the current limit value is a value including a low-temperature side margin. invented.
  • Section 1-3-1 shows a configuration that can selectively adopt an appropriate current limit value depending on the temperature, but as in the present disclosure, a head-up display that can set a low temperature margin within the current limit value may be
  • the low-temperature side margin should be able to be set in the storage means such as the memory in the control unit by the calibration software in the calibration process at the product manufacturing stage.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Instrument Panels (AREA)

Abstract

L'invention concerne un affichage tête haute présentant une résistance améliorée à des changements dans un environnement externe. Cet affichage tête haute comporte: une source lumineuse 21r, 21g, 21b qui s'allume à une première luminance et une seconde luminance inférieure à la première luminance; et une unité de commande qui commande la source lumineuse 21r, 21g, 21b dans un premier mode dans lequel la source lumineuse 21r, 21g, 21b est commandée de façon à s'allumer à la première luminance dans une première allure de forme d'ondes, et dans un second mode dans lequel la source lumineuse 21r, 21g, 21b est commandée de façon à s'allumer à la seconde luminance dans une seconde allure de forme d'ondes. L'unité de commande réalise la commande de la source lumineuse 21r, 21g, 21b sur la base d'une première valeur de correction de chromaticité qui est une valeur de correction de chromaticité dans le premier mode, et une seconde valeur de correction de chromaticité qui est une valeur de correction de chromaticité dans le second mode et est différente de la première valeur de correction de chromaticité.
PCT/JP2022/023723 2021-06-21 2022-06-14 Affichage tête haute WO2022270343A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2021-102720 2021-06-21
JP2021102720 2021-06-21

Publications (1)

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WO2022270343A1 true WO2022270343A1 (fr) 2022-12-29

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PCT/JP2022/023723 WO2022270343A1 (fr) 2021-06-21 2022-06-14 Affichage tête haute

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2012104967A1 (fr) * 2011-01-31 2012-08-09 パイオニア株式会社 Dispositif d'affichage d'images, procédé d'affichage d'images, programme d'affichage d'images
JP2017097153A (ja) * 2015-11-24 2017-06-01 船井電機株式会社 プロジェクタ
US20180152680A1 (en) * 2016-11-30 2018-05-31 Microvision, Inc. Speckle Reduction in Multi-Laser Beam Scanning Display
WO2020054378A1 (fr) * 2018-09-12 2020-03-19 ソニー株式会社 Dispositif d'affichage, procédé de commande d'affichage, et support d'enregistrement
WO2020241512A1 (fr) * 2019-05-27 2020-12-03 日本精機株式会社 Dispositif d'affichage tête haute

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2012104967A1 (fr) * 2011-01-31 2012-08-09 パイオニア株式会社 Dispositif d'affichage d'images, procédé d'affichage d'images, programme d'affichage d'images
JP2017097153A (ja) * 2015-11-24 2017-06-01 船井電機株式会社 プロジェクタ
US20180152680A1 (en) * 2016-11-30 2018-05-31 Microvision, Inc. Speckle Reduction in Multi-Laser Beam Scanning Display
WO2020054378A1 (fr) * 2018-09-12 2020-03-19 ソニー株式会社 Dispositif d'affichage, procédé de commande d'affichage, et support d'enregistrement
WO2020241512A1 (fr) * 2019-05-27 2020-12-03 日本精機株式会社 Dispositif d'affichage tête haute

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