JP2006011168A - Head-up display device for vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a head-up display device for a vehicle in which a light emitting display is hardly damaged by sun beams. <P>SOLUTION: The head-up display device for a vehicle displays a virtual image by projecting display light beams L emitted by a light emitting type display device 22 onto a projection member by a reflection mirror 36. The head-up display device for a vehicle is provided with a light shielding member 41 which has a window section 41a, that passes the display light beams L, and is arranged on a reflection surface 36a side of the reflection mirror 36 and a driving means 43 which drives the light shielding member 41. A control means drives a driving means 43 to move the light shielding member 41 based on an operating signal outputted by an operating means. The light emitting display device has a liquid crystal display element 26 which is made by pasting polarizing members 31 and 32 onto a liquid crystal cell 30 and a light emitting element 27 which illuminates the liquid crystal display element 26. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a vehicle head-up display device that displays a virtual image by projecting display light emitted from a light-emitting display onto a projection member such as a windshield.

Conventionally, various head-up display devices for vehicles have been proposed, and for example, disclosed in Patent Document 1. Such a head-up display device 1 for a vehicle projects a display light L on a semi-transmissive plate called a windshield 2 or a combiner of the vehicle to display a virtual image V (see FIG. 4).
JP 2003-295105 A

  The vehicle head-up display device 1 includes a housing 3 in which a liquid crystal display 4 and a reflection mirror 5 are accommodated, and the display light L emitted from the liquid crystal display 4 is reflected by the reflection mirror 5 to provide a translucent cover. 6 is projected onto the windshield 2 or the semi-transmissive plate (see FIG. 5). The reflection mirror 5 is sized to accommodate various viewpoint heights of the driver. For example, the virtual images V and V1 can be visually recognized even when the driver D has a low viewpoint position or the driver D1 has a high viewpoint position. It has become.

However, the liquid crystal display 4 may be damaged by the sunlight M that has entered through the translucent cover 6. That is, the sunlight M that has passed through the translucent cover 6 and is reflected by the reflection mirror 5 enters the liquid crystal display element 7, the front polarizing member 11 is heated above the heat resistance temperature, and the front polarizing member 11 is melted. There was a fear.
The present invention has been made in view of this problem, and provides a head-up display device for a vehicle in which the light emitting display device is less likely to be damaged by sunlight.

  The present invention is the vehicle head-up display device that displays the virtual image by projecting the display light L emitted from the light emitting display 22 onto the projection member by the reflection mirror 36, as described in claim 1. A light shielding member 41 having a window 41a for allowing the display light L to pass therethrough is provided on the reflection surface 36a side of the reflection mirror 36, and a driving means 43 for moving the light shielding member 41.

  Further, according to the present invention, as described in claim 2, the operating means 62 and 63 for operating the driver so that the virtual image can be visually recognized, and the driving means based on the operation signal output by the operating means 62 and 63. And a control means 65 for moving the light shielding member 41 by driving 43.

  Further, according to the present invention, as described in claim 3, the light emitting display includes a liquid crystal display element 26 in which polarizing members 31 and 32 are attached to a liquid crystal cell 30, and a light emitting element that illuminates the liquid crystal display element 26. 27 is a liquid crystal display 22 having

  A part of sunlight is blocked by the light-shielding member, and the sunlight reflected by the reflective mirror to the light-emitting display is reduced, so that the temperature rise of the light-emitting display can be suppressed and the light-emitting display is damaged There is little possibility to do.

  Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings.

  The vehicle head-up display device 21 includes a liquid crystal display 22 (light-emitting display), a reflector 23, and a light shield 24 housed in a housing 25. The liquid crystal display 22 includes a liquid crystal display element 26, a light emitting element 27, and a case body 28. The liquid crystal display element 26 is obtained by attaching a front polarizing member 31 and a rear polarizing member 32 to the front and rear surfaces of the TFT liquid crystal cell 30, and is supported by the case body 28. The light emitting element 27 is made of, for example, a white light emitting diode, and is disposed behind the liquid crystal display element 26 to illuminate and transmit the liquid crystal display element 26.

  Reference numeral 33 denotes a heat radiating plate, and the heat radiating plate 33 is attached to the rear surface of the light emitting element 27. The heat sink 33 is made of a metal such as aluminum (Al), and has a flat plate shape. Reference numeral 34 denotes a heat radiating member made of a metal such as aluminum (Al). The heat radiating member 34 is disposed in the opening 25 a of the housing 25. The heat radiating member 34 is fixed to the housing 25 by a flange portion 34a with a screw (not shown). A heat radiating plate 33 is bonded to the heat radiating member 34 with a heat conductive adhesive. The heat radiating member 34 is provided with a plurality of heat radiating fins 34b.

  The reflector 23 includes a reflection mirror 36 and a holding member 37. The reflection mirror 36 is formed by depositing a metal (for example, aluminum) on a resin (for example, polycarbonate) to form a reflection surface 36a. The reflecting surface 36a is a concave surface so that a virtual image is enlarged and displayed. The reflection mirror 36 is bonded to the holding member 37 with a double-sided adhesive tape. The holding member 37 is made of resin (for example, ABS) and is fixed to the housing 25.

  The light shield 24 includes a light shielding plate 41 (light shielding member), a gear 42, and a stepping motor 43 (drive means). The light shielding plate 41 is supported by the housing 25 so as to be slidable in an oblique direction. The light shielding plate 41 is provided with an opening 41 a (window) through which the display light L passes and a gear portion 41 b that meshes with the gear 42. The opening 41 a formed in the light shielding plate 41 is smaller than the reflecting surface 36 a of the reflecting mirror 36. The driver of the vehicle operates a push button switch, which will be described later, and adjusts the position of the light shielding plate 41 so that the display light L is reflected from the viewpoint of the driver (that is, the virtual image can be visually recognized).

  The housing 25 accommodates a liquid crystal display 22, a reflector 23, a light shield 24, and the like. An opening 25b through which the display light L is emitted is formed in the housing 25, and a translucent cover 45 is disposed in the opening 25b. The translucent cover 45 is made of a translucent resin (for example, acrylic) and has a curved shape. The housing 25 is provided with a light shielding wall 25c. The light shielding wall 25c is formed so as to hang obliquely from the top of the housing 25. The light shielding wall 25c prevents a phenomenon (washout) in which external light such as sunlight enters the liquid crystal display 22 and makes it difficult to see a virtual image.

  Reference numeral 51 denotes an optical sensor such as a photodiode, and the optical sensor 51 is mounted on a circuit board 52. The optical sensor 51 mounted on the circuit board 52 is fixed to a holding portion 25e that hangs down from the top of the housing 24. The optical sensor 51 receives light that has passed through the translucent cover 45, detects the brightness in front of the vehicle, and outputs illuminance data to a microcomputer to be described later. 53 is a cylindrical body, and this cylindrical body 53 is formed integrally with the light shielding wall 25c. The cylindrical body 53 has a substantially cylindrical shape and regulates the angular range of light incident on the optical sensor 51.

  FIG. 3 is a block diagram showing an electrical configuration of the vehicle head-up display device 21. Reference numeral 58 denotes a rotation sensor. The rotation sensor 58 detects the number of revolutions of the engine and outputs the revolution number data to the microcomputer 59. The microcomputer 59 displays the engine speed on the liquid crystal display element 26 via the drive circuit 60 and lights the light emitting element 27 via the drive circuit 61. The microcomputer 59 adjusts the light emission luminance of the light emitting element 27 according to the illuminance data input from the optical sensor 51.

  Reference numerals 62 and 63 denote push button switches (operation means). The push button switches 62 and 63 output operation signals to the microcomputer 59. The push button switches 62 and 63 slide the light shielding plate 41, and the microcomputer 59 drives the stepping motor 43 via the drive circuit 64 when the operation signal from the push button switches 60 and 61 is input. . The control unit 65 (control means) includes a microcomputer 59 and drive circuits 60, 61, 64.

  When the push button switch 62 is operated, the opening 41a of the light shielding plate 41 slides obliquely upward to adapt to a driver with a high viewpoint position (see FIG. 1), and when the push button switch 63 is operated, the light shielding is performed. The opening 41a of the plate 41 slides obliquely downward to adapt to a driver with a low viewpoint position (see FIG. 2). When sunlight M enters from the translucent cover 45, a part of the sunlight M is blocked by the light shielding plate 41, so that the sunlight reflected by the liquid crystal display 22 is reduced. A part of the sunlight M enters the reflection mirror 36 through the opening 41a of the light shielding plate 41 and is reflected by the liquid crystal display 22. However, the sunlight M incident on the reflection mirror is less than that in the past.

  According to the present embodiment, since a part of sunlight M incident from the translucent cover 45 can be blocked by the light shielding plate 41, the temperature rise of the liquid crystal display element 26 can be suppressed, and the polarizing members 31, The possibility of damage to 32 can be reduced.

  The present invention is not limited to this embodiment, and various modifications are possible. For example, the light emitting display may be an organic EL display, but the polarization of the liquid crystal display element 26 may be changed. Since the members 31 and 32 have a low heat-resistant temperature, it is preferable to apply the present invention. Further, although the reflection mirror 36 of the present embodiment is a concave mirror, it may be a plane mirror.

Sectional drawing which shows embodiment of this invention. Sectional drawing which shows embodiment same as the above. The block diagram which shows embodiment same as the above. The general-view figure which shows a prior art example. Sectional drawing which shows a prior art example same as the above.

Explanation of symbols

22 Liquid crystal display (light emitting display)
27 Light emitting element 30 Liquid crystal cell 31 Polarizing member 32 Polarizing member 36 Reflecting mirror 36a Reflecting surface 41 Light shielding member 41a Window portion 43 Stepping motor (driving means)
62 Pushbutton switch 63 Pushbutton switch 65 Control means L Display light M Sunlight

Claims (3)

A vehicle head-up display device that displays a virtual image by projecting display light emitted from a light-emitting display device onto a projection member using a reflection mirror,
A head-up display device for a vehicle, comprising: a light shielding member having a window portion through which the display light passes and provided on a reflection surface side of the reflection mirror; and a driving unit that moves the light shielding member.   An operation means for operating the driver so that the virtual image can be visually recognized; and a control means for moving the light shielding member by driving the drive means based on an operation signal output by the operation means, The head-up display device for a vehicle according to claim 1.   2. The vehicle according to claim 1, wherein the light emitting display is a liquid crystal display having a liquid crystal display element having a polarizing member attached to a liquid crystal cell and a light emitting element that illuminates the liquid crystal display element. Head-up display device.

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