JP2014085657A - Display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a display device having a small risk of overheating a display unit.SOLUTION: A light source 11 is configured to emit illumination light. A display unit 19 includes: a display element 14 to be illuminated with the illumination light; and a case body 18 in which the display element 14 is stored, and the display unit 19 is configured to emit display light L. A reflection member 21 is configured to reflect the display light L emitted by the display unit 19. The display light L reflected by the reflection member 21 is projected to an imaging member 26. The light source part 11, the display unit 19, the reflection member 21, and the imaging member 26 are fixed to a heat dissipation member 31. Support parts 31b, 31f and 18m are configured to support the display unit 19 such that the case body 18 is separated from the heat dissipation member 31. The display unit 19 is positioned at the heat dissipation member 31 by the support parts 31b, 31f and 18m.

Description

  The present invention relates to a display device including a light source unit that generates heat.

  Conventionally, various head-up display devices that display a virtual image in front of a windshield have been proposed. The head-up display device is provided on a dashboard of a vehicle and displays a virtual image by projecting display light onto a windshield. Various display devices are conceivable as display means for projecting display light, and a head-up display device using a projector is disclosed in Patent Document 2.

  However, there is a slight deviation in the relative position and angle between the projector and the reflecting mirror (so-called folding mirror) that reflects the display light emitted by the projector, and there is a possibility that a desired virtual image cannot be obtained. . For example, when the reflecting mirror fixed to the housing is slightly inclined with respect to a desired angle, there is a problem that a part of the virtual image is not displayed. Therefore, the applicant of the present application has proposed a display device in which a display and a reflecting member are fixed to a heat radiating member as Japanese Patent Application No. 2012-40957.

JP 2010-277065 A JP 2004-126226 A

However, in the display device in which the display is fixed to the heat radiating member, heat is transmitted from the heat radiating member to the display, the display is overheated and damaged, and a desired display cannot be performed.
The present invention has been made in view of this problem, and provides a display device in which the display device is less likely to overheat.

  The present invention includes a light source unit 11 that emits illumination light, a display 19 that includes a display element 14 that is illuminated by the illumination light, and a case body 18 that houses the display element 14, and the light source unit 11 and the display. And support portions 31b, 31f, and 18m that support the display 19 so that the case body 18 is separated from the heat dissipation member 31.

  The present invention also includes a light source unit 11 that emits illumination light, a display element 14 that is illuminated by the illumination light, and a display 19 that emits display light L, and a case body 18 that houses the display element 14. A reflection member 21 that reflects the display light L emitted from the display 19, an imaging member 26 that projects the display light L reflected by the reflection member 21, the light source unit 11, and the display 19 And a heat dissipating member 31 for fixing the reflecting member 21 and the imaging member 26, and support portions 31b, 31f for supporting the display unit 19 so that the case body 18 is separated from the heat dissipating member 31. 18m is provided.

  In the present invention, the indicator 19 is positioned on the heat radiating member 31 by the support portions 31b, 31f, and 18m.

  In the present invention, the support portions 31f and 18m are hollow.

  Since the display is supported so as to be separated from the heat radiating member, the heat from the light source part is difficult to be transmitted to the display element, so that the display element is less likely to be damaged.

1 is an overview diagram showing a first embodiment of the present invention. Sectional drawing which shows embodiment same as the above. Sectional drawing of the light source part which shows embodiment same as the above. Sectional drawing which shows embodiment same as the above. Sectional drawing which shows the principal part which shows embodiment same as the above. The principal part sectional view showing a second embodiment of the present invention. The principal part sectional view showing a third embodiment of the present invention. The principal part expansion perspective view which shows other embodiment of this invention. The principal part expansion perspective view which shows other embodiment of this invention.

  Hereinafter, an embodiment in which the present invention is applied to a head-up display device will be described with reference to the accompanying drawings. 1 to 5 show a first embodiment.

  The head-up display device displays the virtual image V by reflecting the display light L projected by the display device 2 provided on the dashboard 1 of the vehicle to the vehicle driver 4 side by the windshield 3. The vehicle driver 4 can visually recognize the virtual image V superimposed on the landscape. The display device 2 includes a first unit 100 and a second unit 200.

  The first unit 100 includes a projector 10, a plane mirror (reflecting member) 21, a transmissive screen (imaging member) 26, a heat sink (heat radiating member) 31, a housing 41, and the like. The second unit 200 includes reflectors 50 and 60, a housing 71, and the like.

  The projector 10 displays an image on the transmissive screen 26 by a field sequential method. The projector 10 includes a light source unit 11, a mirror unit 12, a prism 13, a DMD (display element) 14, and a projection lens 15, and is fixed to a heat sink 31. The light source unit 11 of the projector 10 includes a blue light emitting diode 11a, a red light emitting diode 11b, a green light emitting diode 11c, lenses 11d, 11e, 11f, a reflecting mirror 11g, dichroic mirrors 11h, 11i, and a circuit board 11k. The lenses 11d, 11e, 11f, the reflection mirror 11g, and the dichroic mirrors 11h, 11i are fixed to the frame 11m.

  The blue light emitting diode 11a, the red light emitting diode 11b, and the green light emitting diode 11c emit blue light B, red light R, and green light G, respectively. The blue light emitting diode 11a, the red light emitting diode 11b, and the green light emitting diode 11c are mounted on the circuit board 11k. The circuit board 11k is in contact with the heat sink 31, and heat generated by the blue light emitting diode 11a, the red light emitting diode 11b, and the green light emitting diode 11c is dissipated by the heat sink 31 through the circuit board 11k.

  The lenses 11d, 11e, and 11f collect the blue light B, red light R, and green light G emitted from the blue light emitting diode 11a, the red light emitting diode 11b, and the green light emitting diode 11c, respectively. The reflection mirror 11g reflects the blue light B emitted from the blue light emitting diode 11a and collected by the lens 11d. The dichroic mirror 11h reflects the red light R emitted from the red light emitting diode 11b and collected by the lens 11e, and transmits the blue light B reflected by the reflection mirror 11g. The dichroic mirror 11i reflects the green light G emitted from the green light emitting diode 11c and collected by the lens 11f, and transmits the blue light B and the red light R transmitted or reflected by the reflection mirror 11h.

  The display 19 has a mirror unit 12, a prism 13, a DMD 14, and a projection lens 15 housed in a case body 18. The display 19 is not in direct contact with the light source unit 11. The prism 13 transmits the light from the mirror unit 12 and irradiates the DMD 14. The DMD (Digital Micromirror Device) 14 is a reflective display element in which a large number of minute mirror surfaces are arranged in a plane, and generates display light L. The display light L is reflected toward the projection lens 15 by the inclined surface 13 a of the prism 13. The projection lens 15 enlarges the display light L and projects it onto the plane mirror 21. The projection lens 15 may be composed of a single lens or a plurality of lenses.

  The plane mirror 21 is held by the support member 23 and reflects the display light L from the projector 10 to the transmissive screen 26. The transmissive screen 26 is held by the support member 24, and the display light L from the projector 10 is imaged on the transmissive screen 26. The heat sink 31 is made of metal such as aluminum (Al) and has a plurality of heat radiation fins 31a. The plane mirror 21 and the transmission screen 26 are fixed to the heat sink 31 via holding members 23 and 24. The housing 41 is made of an opaque resin (for example, polypropylene), and houses the projector 10, the plane mirror 21, the transmission screen 26, and the like. The housing 41 is formed with a window 41a from which the display light L is emitted.

  The reflector 50 includes a plane mirror 51 and a support member 52. The plane mirror 51 reflects the display light L from the first unit 100 to the concave mirror 61. The support member 52 is fixed to the housing 71 and holds the plane mirror 35. The reflector 60 includes a concave mirror 61, a mirror holder 62, a stepping motor 63, and a support member 64. The concave mirror 61 is formed by depositing a metal (for example, aluminum) on a resin (for example, polycarbonate) to form a reflective surface 61a. The reflecting surface 61a is a concave surface, and the display light L reflected by the plane mirror 51 is enlarged to display the virtual image V. The concave mirror 61 is bonded to the mirror holder 62 with a double-sided adhesive tape. The mirror holder 62 is made of resin (for example, ABS), and the gear portion 65 and the shaft portion 66 are integrally formed.

  A gear 67 is attached to the rotation shaft of the stepping motor 63, and this gear 67 is engaged with the gear portion 65 of the mirror holder 62. The concave mirror 61 is supported in a rotatable state together with the mirror holder 62, and the projection direction of the display light L can be adjusted by rotating the concave mirror 61 by the stepping motor 63. The vehicle driver 4 operates a pushbutton switch (not shown) to adjust the angle of the concave mirror 61 so that the display light L is reflected at the eye position (that is, the virtual image V can be visually recognized).

  The housing 71 is made of an opaque resin (for example, polypropylene) and accommodates the reflectors 50 and 60. The housing 71 is provided with a light shielding wall 71a to prevent a phenomenon (washout) in which external light such as sunlight enters the transmission screen 26 and the virtual image V becomes difficult to see. The light shielding wall 71 a has a flat plate shape and is formed so as to hang obliquely from the top of the housing 71. An opening 71b through which the display light L is emitted is formed on the upper surface of the housing 71, and a translucent cover 72 is attached to the opening 71b. The translucent cover 72 is made of a transparent resin such as polycarbonate and has a curved shape.

  Next, the support structure of the display 19 will be described in detail with reference to FIG. A support portion 31 b is provided on the front surface 31 d of the heat sink 31. The support portion 31b of the heat sink 31 has a substantially cylindrical shape, and a convex portion 31c is formed at the end of the support portion 31b. The case body 18 of the display device 19 is provided with a flat plate-shaped protruding portion 18a, and the display device 19 is supported by the support portion 31b by the protruding portion 18a. The convex portion 31 c of the support portion 31 b is inserted into the through hole 18 b formed in the protruding portion 18, and the display 19 is positioned on the heat sink 31. The case body 18 is supported by the support portion 31 b so that the bottom surface 18 c has a predetermined distance H from the front surface 31 d of the heat sink 31.

  FIG. 6 is a diagram showing a second embodiment. The second embodiment is different only in the support portion 31f, the protruding portion 18d, and the like, and the other configurations are the same as those in the first embodiment.

  A support portion 31 f is provided on the front surface 31 d of the heat sink 31. The support part 31f of the heat sink 31 has a hollow cylindrical shape. The case body 18 of the display 19 is provided with a flat plate-shaped protrusion 18d that protrudes to the side, and the display 19 is supported by the support 31f by the protrusion 18d. A concave portion 18 f is formed in the projecting portion 18 d, and the end portion of the support portion 31 f is fitted into the concave portion 18 f so that the display 19 is positioned on the heat sink 31. The case body 18 is supported by the support portion 31f so that the bottom surface 18c has a predetermined distance H from the front surface 31d of the heat sink 31.

  FIG. 7 is a diagram showing a third embodiment. The third embodiment differs from the first embodiment only in the protrusion 18k, the support 18m, and the like, and the other configurations are the same as those in the first embodiment.

  The case body 18 of the display device 19 is provided with a flat plate-like protruding portion 18k protruding sideways and a support portion 18m provided so as to be dropped from the protruding portion 18k. The case body 18 of the display 19 is supported by the protrusion 18k and the support 18m. A recess 31 g is formed in the heat sink 31, and a support portion 18 m is fitted into the recess 31 g, so that the display 19 is positioned on the heat sink 31. The case body 18 is supported by the support portion 18m so that the bottom surface 18c has a predetermined distance H from the front surface 31d of the heat sink 31.

  In each embodiment, the projector 10, the plane mirror 21, and the transmissive screen 26 are fixed to the metal heat sink 31 having higher rigidity than the resin housing 41. There is little risk of errors in the position and angle of the mold screen 26. Moreover, in each embodiment, since the display apparatus 2 is divided into the 1st unit 100 and the 2nd unit 200, an assembly | attachment is easy and manufacturing cost can be reduced. Furthermore, since the display 19 of the projector 10 is supported so as to be separated from the heat sink 31, heat from the light source unit 11 is difficult to be transmitted to the DMD 14 via the heat sink 31, so that the DMD 14 is less likely to be damaged.

  In addition, this invention is not limited to each embodiment, A various deformation | transformation is possible. For example, as shown in FIGS. 8 and 9, the support portions 31f and 18m may be formed in a hollow cylindrical shape, and positioning convex portions may be provided at the end portions. Moreover, although the display element of each embodiment was DMD14, a liquid crystal display element may be sufficient.

DESCRIPTION OF SYMBOLS 10 Projector 11 Light source part 11B Blue light emitting diode 11R Red light emitting diode 11G Green light emitting diode 14 DMD (display element)
18 Case body 18m Support part 19 Display 21 Plane mirror (reflective member)
26 Transmission screen (imaging member)
31 Heat sink (heat dissipation member)
31b Support part 31f Support part L Display light

Claims (4)

  A light source that emits illumination light; a display device that includes a display element that is illuminated by the illumination light; and a case body that houses the display element; and a heat dissipation member that fixes the light source unit and the display. A display device comprising a support portion for supporting the display so that a case body is separated from the heat radiating member.   A display having a light source that emits illumination light, a display element illuminated by the illumination light, and a case body that houses the display element, and emitting display light; and reflecting the display light emitted by the display A reflecting member; an imaging member on which the display light reflected by the reflecting member is projected; and a heat radiation member that fixes the light source unit, the display, the reflecting member, and the imaging member. A display device comprising a support portion for supporting the display so that the case body is separated from the heat radiating member.   The display device according to claim 1, wherein the display is positioned on the heat radiating member by the support portion.   The display device according to claim 1, wherein the support portion is hollow.

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