WO2020166293A1 - Dispositif d'affichage d'image virtuelle - Google Patents

Dispositif d'affichage d'image virtuelle Download PDF

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Publication number
WO2020166293A1
WO2020166293A1 PCT/JP2020/002284 JP2020002284W WO2020166293A1 WO 2020166293 A1 WO2020166293 A1 WO 2020166293A1 JP 2020002284 W JP2020002284 W JP 2020002284W WO 2020166293 A1 WO2020166293 A1 WO 2020166293A1
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WIPO (PCT)
Prior art keywords
image display
wall portion
display panel
display device
heat
Prior art date
Application number
PCT/JP2020/002284
Other languages
English (en)
Japanese (ja)
Inventor
俊樹 石川
Original Assignee
株式会社デンソー
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Filing date
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Application filed by 株式会社デンソー filed Critical 株式会社デンソー
Publication of WO2020166293A1 publication Critical patent/WO2020166293A1/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

Definitions

  • the disclosure by this specification relates to a virtual image display device.
  • the liquid crystal display device housed in the casing of the virtual image display device described in Patent Document 1 has a liquid crystal panel and a heat sink.
  • the heat sink is formed in a tubular shape with its opening closed by the liquid crystal panel. The heat of the liquid crystal panel is conducted to the heat sink.
  • Patent Document 1 suppresses overheating in the liquid crystal panel illuminated by the illumination light.
  • the heat is radiated from the heat sink arranged inside the housing, the heat is collected inside the housing, and there is a concern that the components housed in the housing may be adversely affected. As a result, it may be difficult to stably display a virtual image with good visibility.
  • One of the purposes of the disclosure of this specification is to provide a virtual image display device capable of stably displaying a virtual image with good visibility.
  • a virtual image display device for displaying an image in a virtual image
  • a hollow housing having an exterior member
  • a display housed in a housing and held against the plate portion of the exterior member
  • the display is A backlight unit that supplies illumination light
  • An image display panel that is arranged to be inclined with respect to the plate unit on the side opposite to the plate unit across the backlight unit and that is illuminated by illumination light to display an image
  • the image display panel is formed into a cylindrical shape that accommodates at least a part of the backlight unit and is arranged so that the opening is closed by the image display panel and contacts the exterior member on the side opposite to the image display panel.
  • a heat conducting member having a short wall portion and a long wall portion having a dimensional difference due to the inclination of the image display panel which is a member that conducts heat to the exterior member, as the wall portions on both sides of the backlight unit,
  • the short wall portion side contact area where the short wall portion side of the heat conducting member and the exterior member contact is larger than the long wall portion side contact area where the long wall portion side of the heat conducting member contacts the exterior member.
  • the image display panel is arranged on the opposite side of the plate portion of the exterior member with the backlight unit interposed therebetween, and closes the opening of the heat conduction member.
  • the heat conducting member is formed in a tubular shape that houses at least a part of the backlight unit, and is in contact with the exterior member. In this way, the heat of the image display panel can be released to the exterior member via the heat conducting member.
  • the image display panel is arranged so as to be inclined with respect to the plate portion, and the wall portions on both sides sandwiching the backlight unit by the heat conducting members are short walls having a dimensional difference with each other due to the inclination. Part and long wall part. Furthermore, the contact area of the heat conducting member with the exterior member is larger on the short wall portion side than on the long wall portion side.
  • the distance of the path is short and the contact area with the exterior member is large, so the amount of heat dissipation increases. That is, it is possible to intensively dissipate heat from the heat dissipation path extending from the image display panel to the exterior member via the short wall portion. Therefore, heat is unlikely to be trapped in the housing, and the influence of heat on the components housed in the housing can be reduced. As a result, a virtual image with good visibility can be stably displayed.
  • a virtual image display device is a head-up display device (hereinafter, a HUD device) 10 used in a vehicle and housed in an instrument panel of the vehicle. is there.
  • the HUD device 10 projects an image toward the projection unit 1a set on the windshield 1 of the vehicle.
  • the HUD device 10 displays the image as a virtual image VRI that can be visually recognized by an occupant of the vehicle. That is, when the display light reflected by the projection unit 1a reaches the visual recognition area EB set inside the vehicle, the occupant whose eye point is located in the visual recognition area EB can recognize various information. ..
  • Examples of the information displayed as the virtual image include information indicating the state of the vehicle such as the vehicle speed and the amount of fuel remaining, or navigation information such as visibility assistance information and road information.
  • the vehicle windshield 1 is a translucent plate-shaped member made of, for example, glass or synthetic resin and is disposed above the instrument panel.
  • the windshield 1 is arranged so as to be inclined from the instrument panel as it goes from the front to the rear.
  • the windshield 1 has a projection portion 1a on which image display light is projected, which is formed in a smooth concave shape or a flat shape.
  • the projection unit 1a may not be provided on the windshield 1.
  • a combiner that is separate from the vehicle may be installed in the vehicle, and the projection unit 1a may be provided in the combiner.
  • the visual recognition area EB is a spatial area that can be visually recognized so that the virtual image VRI displayed by the HUD device 10 satisfies a predetermined standard (for example, the entire virtual image VRI has a predetermined brightness or more), and is also an eye box. Is called.
  • the visual recognition area EB is typically set so as to overlap with the eyelids of the vehicle.
  • the eye lip is set for each eye, and is set as an ellipsoidal virtual space based on the eye range that statistically represents the spatial distribution of the occupant's eye points.
  • the HUD device 10 includes a housing 11, a display 21, a control circuit unit 41, a light guide section 51, and the like.
  • the housing 11 is in the shape of a hollow box that houses the display unit 21, the control circuit unit 41, the light guide unit 51, and the like, and is installed in the instrument panel of the vehicle.
  • the housing 11 has an upper member 12 and a lower member 15 as exterior members.
  • the upper member 12 and the lower member 15 are coupled to each other by engagement, fitting, or the like.
  • the upper member 12 is disposed above the lower member 15 and is formed of, for example, synthetic resin or metal so as to have a light shielding property.
  • the upper member 12 is formed in a lid shape that opens downward.
  • the upper member 12 has a window portion 13 that is optically opened on the upper surface portion that faces the projection portion 1a.
  • the window 13 is covered with, for example, a dustproof sheet 14 that can transmit display light.
  • the lower member 15 is made of, for example, synthetic resin or metal so as to have a light-shielding property.
  • the lower member 15 has a high thermal conductivity so as to obtain a heat radiation effect described later.
  • Aluminum, for example, is adopted as the base material of the lower member 15.
  • the lower member 15 is formed in a cup shape that opens upward.
  • the lower member 15 integrally has a bottom plate portion 16, a standing plate portion 17, and the like.
  • the bottom plate portion 16 constitutes the bottom portion of the housing 11, and is formed in a flat plate shape extending in the horizontal direction.
  • the standing plate portion 17 is connected to the rear end portion of the bottom plate portion 16 and is formed in a flat plate shape extending upward from the end portion in a direction substantially perpendicular to the bottom plate portion 16, It stands upright on the bottom plate portion 16.
  • a heat radiation fin exposed to the outside of the housing 11 may be provided.
  • a radiating fin exposed to the outside of the housing 11 may be provided by forming a plurality of protrusions protruding rearward from the upright plate portion 17.
  • the display 21 is held by the bottom plate portion 16.
  • the display 21 is a transmissive liquid crystal display that displays an image on the display screen 28b and projects the display light of the image toward the light guide section 51.
  • the display 21 includes a backlight unit 22, an image display panel 28, a transparent member 30, a heat conductive member 32, and the like.
  • the backlight unit 22 supplies illumination light to the image display panel 28.
  • the backlight unit 22 is composed of a plurality of light source elements 23, a light source circuit board 24, a connector 25, an illumination optical section 26, and the like.
  • the plurality of light source elements 23 are arranged and formed on the light source circuit board 24.
  • the light source element 23 of this embodiment employs a light emitting diode element as a point light source, for example.
  • Each light source element 23 is formed by sealing a chip-shaped blue light emitting diode with a yellow fluorescent material in which a yellow fluorescent agent is dispersed in a translucent synthetic resin.
  • the blue light emitted from the blue light emitting diode excites the yellow phosphor to emit the yellow light.
  • the white light from each light source element 23 (more specifically, the pseudo white light is emitted). ) Light source light is emitted.
  • the light source circuit board 24 is a rigid board having a rectangular outline and a flat plate shape using a synthetic resin such as glass epoxy resin as a base material.
  • the light source circuit board 24 is held in close contact with the bottom plate portion 16 in a posture substantially parallel to the bottom plate portion 16.
  • the wiring pattern and each light source element 23 are electrically connected. The amount of light emitted from each light source element 23 changes according to the amount of current passed through each light source element 23 through such a wiring pattern.
  • the connector 25 is mounted on the outer surface adjacent to the control circuit unit 41 on the front surface of the light source circuit board 24.
  • the connector 25 has a connector housing and a plurality of terminals.
  • the connector housing is formed of, for example, a synthetic resin, holds each terminal, and forms a coupling structure for coupling the connector with the electric wire 61 (for example, a wire harness).
  • Each terminal has one end connected to a wiring pattern for the purpose of electrical connection between the light source element 23 and the control circuit unit 41 by the electric wire 61, and the other end facing the outside of the display 21. The part is exposed with respect to the connector housing.
  • the illumination optical unit 26 is arranged on the opposite side of the bottom plate 16 with the light source circuit board 24 and each light source element 23, that is, between each light source element 23 and the image display panel 28.
  • the illumination optical unit 26 is composed of a plurality of optical elements 26a, and converts the light source light emitted from each light source element 23 into illumination light with reduced illumination unevenness by exerting an optical action such as refraction or diffusion. Such illumination light illuminates the image display panel 28.
  • the optical element 26a for example, a lens, a diffusion plate, a polarizing plate, a retardation plate or the like can be adopted.
  • the illumination light provided from the backlight unit 22 is supplied to the image display panel 28 with the irradiation direction ID being a direction substantially perpendicular to the bottom plate 16 and the light source circuit board 24 (that is, the upper side). ..
  • the image display panel 28 of the present embodiment is a TFT liquid crystal panel using thin film transistors (TFTs), for example, an active matrix type that forms a plurality of liquid crystal pixels arranged in a two-dimensional array. It is a liquid crystal panel.
  • TFTs thin film transistors
  • the image display panel 28 has a rectangular shape and a flat plate shape.
  • the image display panel 28 is arranged on the side opposite to the bottom plate portion 16 with the backlight unit 22 interposed therebetween, and is inclined with respect to the bottom plate portion 16.
  • the image display panel 28 of the present embodiment is inclined so as to be spaced apart upward from the bottom plate portion 16 from the rear side toward the front side.
  • the surface of the image display panel 28 on the side of the backlight unit 22 is an illumination target surface 28a that is an object to be illuminated by the illumination light of the backlight unit 22.
  • a surface of the image display panel 28 opposite to the backlight unit 22 is a display screen 28b for displaying an image.
  • the illumination target surface 28a and the display screen 28b are arranged in parallel with each other.
  • a pair of polarizing plates 28c and 28d and a liquid crystal layer sandwiched between the pair of polarizing plates 28c and 28d are laminated.
  • Each of the polarizing plates 28c and 28d has a transmission axis and an absorption axis orthogonal to each other, and has a property of transmitting light polarized in the transmission axis direction and absorbing light polarized in the absorption axis direction.
  • the pair of polarizing plates 28c and 28d are arranged with their transmission axes orthogonal to each other.
  • the image display panel 28 controls the transmittance of each liquid crystal pixel in response to the incidence of the illumination light through the illumination target surface 28a, so that the illumination light is used to display an image on the display screen 28b.
  • Adjacent liquid crystal pixels are provided with color filters of different colors (for example, red, green, and blue), and various colors can be reproduced by combining these.
  • the control of the transmittance is realized by inputting an image signal from the control circuit unit 41 to the image display panel 28 via a connector (not shown) located on the side surface of the image display panel 28.
  • the illumination light traveling along the irradiation direction ID is obliquely incident on the illumination target surface 28 a of the image display panel 28. Then, a part of the illumination light that passes through the image display panel 28 is obliquely emitted from the display screen 28b as the display light of the image.
  • the transparent member 30 is formed in a flat plate shape with a translucent base material having a higher thermal conductivity than the image display panel 28.
  • a translucent base material having a higher thermal conductivity than the image display panel 28.
  • the transparent member 30 has a contact surface 30a that comes into full contact with the illumination target surface 28a of the image display panel 28.
  • the transparent member 30 is laminated on the image display panel 28 by being bonded to the entire surface of the illumination target surface 28a.
  • the heat conducting member 32 is formed of a base material having a higher heat conductivity than that of the image display panel 28, and more preferably higher than that of the transparent member 30, and is formed in a rectangular tubular shape having openings 32a and 32b at both ends.
  • the base material of the heat conducting member 32 for example, aluminum is adopted.
  • the heat conduction member 32 is disposed between the bottom plate portion 16 and the image display panel 28, and thus accommodates at least a part of the backlight unit 22 inside. Specifically, the heat conducting member 32 holds each optical element 26a of the illumination optical unit 26 inside, and thus functions as a housing of the lens barrel by the illumination optical unit 26.
  • the opening 32a on the image display panel 28 side is entirely covered by the image display panel 28. Since the image display panel 28 is inclined with respect to the bottom plate portion 16 as described above, the opening portion 32a is inclined so as to be more distant from the bottom plate portion 16 from the rear side toward the front side with the inclination. It has a cut surface.
  • a part of the light source circuit board 24 and a part of the connector 25 in the backlight unit 22 are exposed to the outside of the display 21. Therefore, the overlapping portion 33b that overlaps the exposed portion of the opening portion 32b is not in contact with the bottom plate portion 16 and is recessed toward the image display panel 28 side with respect to the contact portion 33a, so that the light source circuit board 24 and the connector are formed. It is formed in a concave shape that penetrates 25.
  • the heat-conducting member 32 is a short wall portion 34, a long wall portion 35, and a pair of connection wall portions connecting the short wall portion 34 and the long wall portion 35, as wall portions that form a tubular main body in a rectangular shape.
  • the short wall portion 34 is located at the rear of the main body portion where the distance between the bottom plate portion 16 and the image display panel 28 is relatively small, and extends vertically between the openings 32a and 32b.
  • the long wall portion 35 is located on the front side of the main body portion where the distance between the bottom plate portion 16 and the image display panel 28 is relatively large, and extends vertically between the openings 32a and 32b.
  • the short wall portion 34 and the long wall portion 35 are arranged on opposite sides of the backlight unit 22 with the illumination optical portion 26 interposed therebetween, and have a dimensional difference due to the inclination of the image display panel 28. That is, the long wall portion 35 extends longer than the short wall portion 34.
  • the short wall portion 34 is arranged next to the standing plate portion 17 and substantially parallel to the standing plate portion 17. That is, the circuit member, the optical member, and the optical path by the optical member are not disposed at all between the short wall portion 34 and the standing plate portion 17.
  • the long wall portion 35 is arranged closer to the center of the housing 11 than the short wall portion 34, so that the long wall portion 35 is arranged to face the large space inside the housing 11.
  • the pair of connecting wall portions 36 are arranged on opposite sides of the backlight unit 22 with the illumination optical portion 26 interposed therebetween. That is, the pair of connection wall portions 36 are located on the left side and the right side of the illumination optical section 26, respectively.
  • the area where the short wall portion 34 side of the heat conducting member 32 and the lower member 15 contact each other is defined as the short wall portion side contact area.
  • the area where the long wall portion 35 side of the heat conducting member 32 and the lower member 15 contact each other is defined as the long wall portion side contact area.
  • the contact area on the short wall side is larger than the contact area on the long wall side.
  • the contact position is shorter.
  • the wall portion 34 side, otherwise, the contact position is the long wall portion 35 side.
  • the integration of the contact area of each contact position determined to be the short wall portion 34 side is the short wall portion contact area
  • the integration of the contact area of each contact position determined to be the long wall portion 35 side is the long wall portion contact area. is there.
  • the area difference between the short wall side contact area and the long wall side contact area occurs due to the following two factors.
  • the first factor is that the above-mentioned overlapping portion 33b is provided on the long wall portion 35 side of the opening 32b.
  • the above-described connector 25 is arranged on the long wall portion 35 side including the exposed portion thereof, and accordingly, the exposed portion of the light source circuit board 24 holding the connector 25 is also arranged on the long wall portion 35 side. ing.
  • the overlapping portion 33b overlapping the exposed portion is recessed toward the image display panel 28 side and is not in contact with the bottom plate portion 16, so that the contact area on the long wall portion side is reduced.
  • the second factor is that the heat conducting member 32 is formed with a projecting portion 37 that projects from the short wall portion 34 to the outside of the display 21, that is, rearward.
  • a contact protrusion 16 a is formed on the protruding portion 37 from the bottom plate portion 16 of the lower member 15 so as to contact the protruding portion 37 and project toward the tip of the protruding portion 37.
  • the contact portion between the overhanging portion 37 and the contact protrusion 16a increases the contact area on the long wall portion side.
  • a screw fastening hole is formed in the contact protrusion 16a, and a screw passing hole is formed in the overhanging portion 37. Then, after the screw 63 has passed through the screw through hole, the screw 63 is engaged with the screw fastening hole to fasten the overhang portion 37 and the contact protrusion 16a.
  • Such fastening does not merely stabilize the holding state of the indicator 21 with respect to the bottom plate portion 16. Even when vibration is applied to the HUD device 10 while the vehicle is traveling, the contact state between the overhang portion 37 and the contact protrusion 16a is maintained in a good condition.
  • a heat radiation path from the image display panel 28 to the lower member 15 via the heat conductive member 32 is configured.
  • the side surface formed on the outer edge portion 30b of the transparent member 30 and the inner side portion of the opening 32a of the heat conducting member 32 are in contact with each other by abutting, bonding, or the like. Therefore, not only the heat of the image display panel 28 is directly transferred to the heat conductive member 32, but also the heat can be transferred to the heat conductive member 32 through the transparent member 30.
  • the heat dissipation path via the short wall section 34, the heat dissipation path via the long wall section 35, and the heat dissipation path via the connection wall section 36 in the main body of the heat conducting member 32 are included. is assumed.
  • the heat dissipation path via the short wall portion 34 has a short distance between the openings 32a and 32b through the short wall portion 34, and has a large contact area on the short wall portion side, so that a sufficient heat transfer function is exhibited. ..
  • the distance between the openings 32a and 32b passing through the long wall portion 35 is long and the contact area on the long wall portion side is small, so that the heat transfer function is sufficiently exerted. There is nothing to do.
  • the heat of the image display panel 28 can be intensively radiated from the heat radiation path from the image display panel 28 to the lower member 15 via the short wall portion 34 (FIG. (See white arrow 2).
  • thermal damage is less likely to be applied to the component on the long wall portion 35 side (for example, the connector 25).
  • the parts connected to the connector 25 are also less likely to be damaged by heat.
  • the control circuit unit 41 is held on the bottom plate portion 16 of the lower member 15 outside the display 21.
  • the control circuit unit 41 is arranged in front of the long wall portion 35 and next to the long wall portion 35.
  • the control circuit unit 41 has a control circuit board 42 held in close contact with the bottom plate portion 16, and a connector 43 and a control circuit 44 mounted on the control circuit board 42.
  • the control circuit board 42 is, for example, a rigid board having a rectangular outline and a flat plate shape using a synthetic resin such as a glass epoxy resin as a base material.
  • the connector 43 is arranged so as to face the connector 25 of the display 21. With such a facing arrangement, the electric wire 61 that electrically connects the connectors 25 and 43 is formed to have a short wiring length.
  • the control circuit 44 is an electronic circuit configured by combining a plurality of electronic components.
  • the control circuit 44 enables not only communication with the display device 21 by wired connection via the connectors 25 and 43, but also communication with the drawing ECU of the vehicle by wire connection or wireless connection.
  • the control circuit 44 receives a drawing signal from the drawing ECU and outputs a control signal to the display 21 based on the drawing signal.
  • the light emitting state of the light source element 23 is controlled by inputting a control signal for controlling the backlight unit 22 to the backlight unit 22 through the connector 25.
  • an image signal is input to the image display panel 28 through a connector (not shown) to control the image displayed on the display screen 28b.
  • the light guide section 51 is housed in the housing 11 and forms a display optical path that guides display light emitted from the display screen 28b of the display 21 to the projection section 1a of the windshield 1 (FIG. 2). See the solid arrow).
  • the central optical axis OA in the display optical path is determined by tracing the light ray traveling from the center of the display screen 28b to the irradiation direction ID of the backlight unit 22.
  • the light guide section 51 has, for example, a convex mirror 52 and a concave mirror 53.
  • the optical power of the light guide section 51 which is a combination of the negative optical power of the convex mirror 52 and the positive optical power of the concave mirror 53, is positive. Therefore, the light guide unit 51 enlarges the virtual image VRI with respect to the image on the display screen 28b.
  • the convex mirror 52 is arranged above the display 21.
  • the convex mirror 52 has a reflecting surface 52a formed by, for example, vapor-depositing aluminum on the surface of a base material made of synthetic resin or glass.
  • the reflecting surface 52a is formed in a smooth convex shape.
  • the portion of the reflecting surface 52a through which the central optical axis OA passes is inclined with respect to the irradiation direction ID of the backlight unit 22 so as to face the front and lower oblique directions.
  • the display light that has entered the convex mirror 52 from the display 21 is reflected toward the concave mirror 53 by the reflecting surface 52a thereof.
  • the concave mirror 53 is arranged in front of the display 21.
  • the concave mirror 53 is arranged so that the control circuit unit 41 is sandwiched between the concave mirror 53 and the long wall portion 35.
  • the concave mirror 53 has a reflecting surface 53a formed by, for example, vapor-depositing aluminum on the surface of a base material made of synthetic resin or glass.
  • the reflecting surface 53a is formed in a smooth concave shape.
  • the portion of the reflecting surface 53a through which the central optical axis OA passes is oriented rearward and upward in an oblique direction.
  • the display light that has entered the concave mirror 53 from the convex mirror 52 is reflected toward the windshield 1 by the reflecting surface 53a thereof.
  • the display light thus reflected by the concave mirror 53 is emitted to the outside of the HUD device 10 by passing through the dustproof sheet 14, and enters the projection unit 1 a of the windshield 1.
  • the display light reflected by the projection unit 1a reaches the occupant's eye point in the visual recognition area EB, the occupant can visually recognize the virtual image VRI.
  • the projection unit 1a is provided on the windshield 1 as a transmissive member, the virtual image VRI is displayed so as to be superimposed on the scenery outside the vehicle visually recognized through the windshield 1.
  • outside light such as sunlight can enter the inside of the HUD device 10 through the windshield 1 and the window 13 (see the broken line arrow in FIG. 2 ).
  • Such external light can reach the image display panel 28 by causing the central optical axis OA to go counter to the display light.
  • Part of the external light that has reached is absorbed by the polarizing plate 28d and converted into heat.
  • the reflected light of the external light is reflected in a direction different from the display light and is separated from the display optical path.
  • External light separated from the display optical path in this way can be absorbed by the housing 11.
  • the reduction in the contrast of the virtual image VRI due to the return light due to the reflection of external light being superimposed on the virtual image VRI is suppressed.
  • the inclination of the image display panel 28 contributes to display the virtual image VRI in an upright state without tilting the image plane. That is, by inclining the image display panel 28 and the image plane of the image, the virtual image VRI can be displayed so that the image plane of the virtual image VRI extends vertically based on the Scheimpflug principle.
  • the heat dissipation path that efficiently dissipates the heat of the image display panel 28 by using the cylindrical shape corresponding to the inclination of the image display panel 28 for improving the visibility of the virtual image VRI. Is configured.
  • the image display panel 28 is arranged on the opposite side of the bottom plate portion 16 of the lower member 15 forming the exterior member with the backlight unit 22 interposed therebetween, and closes the opening 32 a of the heat conduction member 32. I'm out.
  • the heat conducting member 32 is formed in a tubular shape that houses at least a part of the backlight unit 22, and is in contact with the lower member 15. In this way, the heat of the image display panel 28 can be released to the lower member 15 via the heat conducting member 32.
  • the image display panel 28 is arranged so as to be inclined with respect to the bottom plate portion 16, and due to the inclination, the wall portions on both sides sandwiching the backlight unit 22 by the heat conduction member 32 have a dimensional difference from each other. It has a short wall portion 34 and a long wall portion 35. Further, the contact area of the heat conducting member 32 with the lower member 15 is larger on the short wall portion 34 side than on the long wall portion 35 side.
  • the distance of the path is short and the contact area with the lower member 15 is large, so that the amount of heat dissipation increases. That is, it is possible to intensively dissipate heat from the heat dissipating path extending from the image display panel 28 to the lower member 15 via the short wall portion 34. Therefore, heat is unlikely to be trapped in the housing 11, and the influence of heat on the components housed in the housing 11 can be reduced. As a result, the virtual image VRI with good visibility can be stably displayed.
  • the long wall portion 35 is located closer to the center of the housing 11 than the short wall portion 34. That is, since the heat radiation path passing through the short wall portion 34, which is the main heat radiation path, is located outside the center of the housing 11, the heat of the image display panel 28 moves to the center of the housing 11. It can be suppressed from being transmitted. Therefore, it is possible to reduce the influence of heat on the components housed in the housing 11.
  • the connector 25 to which the control signal for controlling the backlight unit 22 is input from the outside of the display unit 21 is arranged on the long wall portion 35 side.
  • the connector 25 since the connector 25 is arranged on the side opposite to the heat radiation path passing through the short wall portion 34, which is the main heat radiation path, heat damage to the connector 25 is suppressed, and stability is ensured. Control signals are exchanged. Since the backlight unit 22 is appropriately controlled by the control signal, the virtual image VRI with good visibility can be stably displayed. Further, in the vicinity of the long wall portion 35 outside the display 21, a space through which the display optical path does not pass is formed due to the long dimension of the long wall portion 35, and therefore the wiring from the connector 25 is performed using the space. It can be carried out. This can prevent the wiring from interfering with the display optical path and obstructing the virtual image display.
  • the control circuit unit 41 that is connected to the connector 25 by wire and outputs a control signal is held by the bottom plate portion 16 and arranged next to the long wall portion 35.
  • the control circuit unit 41 By arranging the control circuit unit 41 in a space formed by the long wall portion 35 where the display optical path does not pass, the space can be effectively utilized.
  • the wiring length between the control circuit unit 41 and the connector 25 can be shortened.
  • the HUD device 10 can be downsized and the component cost can be reduced.
  • the transparent member 30 having a higher thermal conductivity than the image display panel 28 has a contact surface 30 a that contacts the image display panel 28 in a stacked state and an outer edge that contacts the heat conductive member 32. And a portion 30b.
  • the heat of the image display panel 28 is smoothly transferred to the heat conducting member 32 through the transparent member 30, and the transparent member 30 is also prevented from obstructing the illumination light of the backlight unit 22. Therefore, the virtual image VRI with good visibility can be stably displayed.
  • the heat conducting member 32 has the overhanging portion 37 formed to overhang the short wall portion 34 and contacting the lower member 15. Since the overhang portion 37 adds a new heat dissipation path branched from the heat dissipation path passing through the short wall portion 34, it is possible to easily realize an increase in the contact area on the short wall portion side. Further, heat is transmitted through the path separated from the components of the backlight unit 22, and the influence of heat on the backlight unit 22 can be reduced.
  • the lower member 15 has the contact protrusions 16 a protruding from the bottom plate portion 16 toward the overhanging portion 37 so as to come into contact with the overhanging portion 37.
  • the dustproof sheet 14 may include a polarizing film having a linear polarization characteristic.
  • the transmission axis A1 of the polarizing film of the dustproof sheet 14 is set in the direction corresponding to the horizontal direction of the virtual image VRI
  • the transmission axis A2 of the polarizing plate 28d on the display screen 28b side of the image display panel 28 is the virtual image VRI. May be set in a direction corresponding to the horizontal direction of.
  • a polarizing plate may be added to the light guide section 51 instead of the dustproof sheet 14 of the first modification having linear polarization characteristics.
  • the transmission axis of this additional polarizing plate should also be set in the direction corresponding to the horizontal direction of the virtual image VRI.
  • the display 21 may not be held by the bottom plate portion 16.
  • the indicator 21 may be held with respect to the standing plate portion 17. Further, the indicator 21 may be held by the lower member 15 with respect to the inclined plate portion that extends obliquely.
  • the heat conducting member 32 may include a portion having a lower heat conductivity than the image display panel 28 and the transparent member 30.
  • the short wall portion 34 is formed to have a higher thermal conductivity than the image display panel 28 and the transparent member 30, and the long wall portion 35 and the connection wall portion 36 are formed to have a lower thermal conductivity than the image display panel 28 and the transparent member 30. It may have been done. In this way, the thermal conductivity of the long wall portion 35 may be set lower than the thermal conductivity of the short wall portion 34.
  • the heat conduction member 32 may house the entire backlight unit 22.
  • the lower member 15 side may have a bottom without opening.
  • a plurality of connectors 25 to which control signals are input may be provided.
  • the plurality of connectors 25 are intensively arranged on the long wall portion 35 side.
  • the projecting portion 37 may be in contact with the upright plate portion 17 in contact with the contact protrusion 16a or in place of contact with the contact protrusion 16a.
  • control circuit unit 41 does not have to be provided next to the long wall portion 35.
  • control circuit unit 41 may be held outside the housing 11.
  • the light guide section 51 various configurations can be adopted as the light guide section 51.
  • a plane mirror may be provided instead of the convex mirror 52.
  • the light guide section 51 may be configured by only one concave mirror 53.
  • the virtual image display device can be applied to various vehicles such as a moving device such as an aircraft and a ship or a non-moving device such as a game machine.

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

Abstract

L'inventin concerne un dispositif HUD (10) comprenant un boîtier creux (11) ayant un élément inférieur (15) et un dispositif d'affichage (21) maintenu par une partie de plaque inférieure (16) de l'élément inférieur (15). Un dispositif d'affichage (21) a une unité de rétroéclairage (22), un écran d'affichage d'image (28) qui est disposé à l'opposé de la partie de plaque inférieure (16) avec une unité (22) interposée entre eux et est incliné par rapport à la partie de plaque inférieure (16), et un élément de conduction thermique (32) qui est formé sous une forme tubulaire dans laquelle au moins une partie de l'unité (22) est logée et une ouverture (32a) est fermé par l'écran d'affichage d'image (28), et qui est en contact avec l'élément inférieur (15) et conduit la chaleur de l'écran d'affichage d'image (28) vers l'élément inférieur (15), l'élément thermoconducteur ayant une partie de paroi courte (34) et une partie de paroi longue (35) qui ont une différence dimensionnelle correspondant à l'inclinaison de l'écran d'affichage d'image (28). La zone de contact côté partie de paroi courte où la partie de paroi courte (34) côté de l'élément de conduction de chaleur (32) et l'élément inférieur (15) sont en contact l'une avec l'autre est plus grande que la zone de contact côté partie de paroi longue où la partie de paroi longue (35) côté de l'élément de conduction de chaleur (32) et l'élément inférieur (15) entrent en contact l'une avec l'autre.
PCT/JP2020/002284 2019-02-14 2020-01-23 Dispositif d'affichage d'image virtuelle WO2020166293A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2019-024702 2019-02-14
JP2019024702A JP2020134588A (ja) 2019-02-14 2019-02-14 虚像表示装置

Publications (1)

Publication Number Publication Date
WO2020166293A1 true WO2020166293A1 (fr) 2020-08-20

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CN115826286A (zh) * 2022-12-12 2023-03-21 芜湖汽车前瞻技术研究院有限公司 显示屏、抬头显示器及车辆

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KR102467924B1 (ko) * 2021-09-23 2022-11-17 엘지전자 주식회사 헤드 업 디스플레이

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JP2008070504A (ja) * 2006-09-13 2008-03-27 Nippon Seiki Co Ltd 表示装置
JP2013174855A (ja) * 2012-01-24 2013-09-05 Nippon Seiki Co Ltd ヘッドアップディスプレイ装置
JP2015157575A (ja) * 2014-02-25 2015-09-03 日本精機株式会社 ヘッドアップディスプレイ装置、ヘッドアップディスプレイ装置の冷却システム
JP2016212292A (ja) * 2015-05-11 2016-12-15 株式会社 オルタステクノロジー 液晶表示装置及びヘッドアップディスプレイ装置

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JP2015079227A (ja) * 2013-10-18 2015-04-23 株式会社 オルタステクノロジー 液晶表示装置及びヘッドアップディスプレイ

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008070504A (ja) * 2006-09-13 2008-03-27 Nippon Seiki Co Ltd 表示装置
JP2013174855A (ja) * 2012-01-24 2013-09-05 Nippon Seiki Co Ltd ヘッドアップディスプレイ装置
JP2015157575A (ja) * 2014-02-25 2015-09-03 日本精機株式会社 ヘッドアップディスプレイ装置、ヘッドアップディスプレイ装置の冷却システム
JP2016212292A (ja) * 2015-05-11 2016-12-15 株式会社 オルタステクノロジー 液晶表示装置及びヘッドアップディスプレイ装置

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115826286A (zh) * 2022-12-12 2023-03-21 芜湖汽车前瞻技术研究院有限公司 显示屏、抬头显示器及车辆

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