JP2004017708A - Display device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a display device free from such apprehension that external light such as sunlight and the light emitted by a display are reflected on a circuit board and a ghost image is produced. <P>SOLUTION: The display device has the display 21, the circuit board 25 and a housing 26 containing the display equipment 21 and the circuit board 25. A shield member 24 prevents light from reflecting on the circuit board 25. The display 21 has a display element 27, and a drive circuit for driving the display element 27 is placed on the circuit board 25. A reflection mirror 22 reflects the display light L emitted from the display 21. An angle position adjusting means 23 adjusts the angle position of the reflection mirror 22. The angle position adjusting means 23 has a motor 31, and a drive circuit for driving the motor 31 is placed on the circuit board 25. The circuit board 25 is fixed to the shield member 24. the shield member 24 has a light shielding wall 24a having an opening 24b through which the display light L passes. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a display device in which a display and a circuit board are housed in a housing.
[0002]
[Prior art]
Conventionally, there is a head-up display that reflects a display light L projected by a display device 2 disposed on a dashboard 1 of a vehicle toward a driver 4 on a windshield 3 to display a virtual image V (see FIG. 5). ). The display device 2 includes a display 5 and a reflecting mirror 6, and the display 5 and the reflecting mirror 6 are accommodated in a housing 9 including an upper case body 7 and a lower case body 8 ( See FIG. 6). The display 5 has a liquid crystal display element 11 and a backlight 12, and displays a vehicle speed and the like. The display light L emitted from the display 5 is reflected by the reflecting mirror 6 and projected on the windshield 3. The driver 4 can visually recognize the virtual image V superimposed on the landscape.
[0003]
A window 7a from which the display light L is emitted is formed in the upper case body 7, and a transparent cover 13 is provided in the window 7a. On the bottom wall of the lower case body 8, supporting portions 8a and 8b are formed so as to protrude. A holder 14 for holding the reflecting mirror 6 and a display 5 are fixed to the supporting portions 8a and 8b, respectively. I have. Further, a circuit board 15 on which a drive circuit for driving the liquid crystal display element 11 and the like are mounted is fixed to the lower case body 8. The liquid crystal display element 11 is electrically connected to the circuit board 15 by a flexible wiring member (not shown).
[0004]
[Problems to be solved by the invention]
However, the sunlight entering from the window 7a or a part L1 of the light emitted downward by the display 5 is reflected by the wiring pattern of the circuit board 15, is projected on the windshield 3 from the window 7a, and is a ghost image. Occurs, which hinders visual recognition of the virtual image V.
The present invention has been made in view of this problem, and provides a display device in which external light such as sunlight or light emitted from a display device is not likely to be irradiated on a circuit board.
[0005]
[Means for Solving the Problems]
The present invention provides a display device for displaying a virtual image, comprising: a display 21, a circuit board 25, and a housing 26 accommodating the display 21 and the circuit board 25. And a shielding member 24 for preventing the circuit board 25 from being irradiated with light.
[0006]
In the present invention, the display 21 has a display element 27, and a drive circuit 43 for driving the display element 27 is mounted on the circuit board 25.
[0007]
Further, the present invention is provided with a reflecting mirror 22 for reflecting the display light L emitted from the display 21 and an angle position adjusting means 23 for adjusting the angular position of the reflecting mirror 22.
[0008]
In the present invention, the angular position adjusting means 23 has a motor 31, and a drive circuit 45 for driving the motor 31 is mounted on the circuit board 25.
[0009]
Further, in the present invention, the circuit board 25 is fixed to the shielding member 24.
[0010]
Further, in the present invention, the shielding member 24 has a light shielding wall 24b having an opening 24c through which the display light L passes.
[0011]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, an embodiment in which the present invention is applied to a head-up display for a vehicle will be described with reference to the accompanying drawings. 1 to 3 show a first embodiment.
The display device 20 includes a liquid crystal display 21 (display), a concave mirror 22 (reflecting mirror), a driving mechanism 23 (angular position adjusting means), a support member 24 (shielding member), a circuit board 25, and a housing 26. .
[0012]
The liquid crystal display 21 has a TFT type liquid crystal display element 27 (display element), a reflector 28, a light emitting diode 29, and a hard wiring board 30. The plurality of light emitting diodes 29 are arranged close to each other and are connected to the hard wiring board 30 (see FIG. 2). The reflector 28 has a rectangular tube shape having an inner reflection surface 28a, and is disposed between the light emitting diode 29 and the liquid crystal display element 27.
The concave mirror 22 is formed by depositing aluminum (Al) on a resin such as polycarbonate (PC) to form a reflective layer. The concave mirror 22 projects the display light L emitted from the liquid crystal display 21 on the windshield of the vehicle.
[0013]
The drive mechanism 23 has a stepping motor 31 (motor), a gear 32 and a mirror holder 33, and swings the concave mirror 22 to adjust the projection direction of the display light L. The mirror holder 33 has an elastic locking piece (not shown), and the concave mirror 22 is fixed by the elastic locking piece. The mirror holder 33 is made of resin such as ABS, and has a shaft portion 33a and a gear portion 33b integrally formed. The shaft 33a is supported by a bearing (not shown), and the concave mirror 22 and the mirror holder 33 are swingably supported. The gear 32 is attached to a rotation shaft of the stepping motor 31, and is meshed with the gear 33b.
[0014]
The support member 24 is made of a resin such as ABS, and the liquid crystal display 21 and the drive mechanism 23 are fixed to the upper surface side of the base 24a. The support member 24 has a light-blocking wall 24b that blocks light L2 emitted upward from the liquid crystal display 21, and an opening 24c through which the display light L passes is formed in the light-blocking wall 24b. It is desirable that the support member 24 be coated with black to reduce the reflectance.
The circuit board 25 is formed by forming a wiring pattern made of a copper foil on a glass epoxy board, and is fixed to the lower surface side of the base 24a with screws. A drive circuit and the like to be described later are mounted on the circuit board 25. The light L <b> 1 emitted downward from the liquid crystal display 21 is blocked by the base 24 a and is not irradiated on the circuit board 25.
[0015]
The housing 26 is made of a resin such as PBT, and has an upper case body 35 and a lower case body 36. A window 35a from which the display light L is emitted is formed in the upper case body 35, and a translucent cover 37 is provided in the window 35a. The translucent cover 37 is made of a translucent resin (eg, acrylic) and has a curved shape. A support portion 36a is formed to project from the bottom wall of the lower case body 36, and the support member 24 is fixed to the support portion 26a.
[0016]
Next, an electrical configuration of the display device will be described with reference to FIG. A speed sensor 40 detects a vehicle speed and outputs speed data to the control unit 41. Reference numeral 42 denotes an operation unit including a push button switch, and the operation unit 42 outputs operation data for adjusting the angular position of the concave mirror 22 by rotating the stepping motor 31 to the control unit 41.
[0017]
The control unit 41 includes a CPU, a RAM, a ROM, and the like. The control unit 41 turns on the light-emitting diode 29 via a drive circuit 44, and based on speed data input from the speed sensor 40, via a drive circuit 43. To cause the liquid crystal display element 27 to display the vehicle speed. Further, the control unit 41 drives the stepping motor 31 via the drive circuit 45 based on the operation data input from the operation means 42. The control unit 41 and the driving circuits 43, 44, 45 are mounted on the circuit board 24.
[0018]
FIG. 4 is a diagram showing the second embodiment. In the second embodiment, since the reflecting mirror 47 and the mirror holder 48 are different from the first embodiment, the same portions are denoted by the same reference numerals, and detailed description is omitted.
The mirror holder 48 is fixed to the front side of the support member 24. The reflecting mirror 47 is attached to a mirror holder 48 with a double-sided adhesive tape. The reflecting mirror 47 projects the display light L emitted from the liquid crystal display 21 on the windshield of the vehicle.
[0019]
According to the first and second embodiments, the sunlight incident from the window 35a and the light L1 emitted downward from the liquid crystal display 21 are not reflected on the circuit board 25, but are reflected on the circuit board 25. There is no danger that ghost images will be generated due to the projected light being projected onto the windshield. Further, since the light L2 emitted upward from the liquid crystal display 21 is blocked by the light shielding wall 24b, there is no possibility that the light L2 is projected from the window 35a onto the windshield and a ghost image is generated.
[0020]
Although the display device of each embodiment is the liquid crystal display device 21, for example, a display device using an organic EL panel may be used. In each of the embodiments, the head-up display is used. However, it goes without saying that the embodiments can be applied to, for example, a virtual image display combination meter.
[0021]
【The invention's effect】
The present invention is a display device including a display, a circuit board, and a housing accommodating the display and the circuit board, wherein a shielding member that prevents the circuit board from being irradiated with light is provided. Therefore, there is no possibility that external light such as sunlight or light emitted from a display device is irradiated on the circuit board, and no ghost image is generated.
[Brief description of the drawings]
FIG. 1 is a sectional view of a display device showing a first embodiment of the present invention.
FIG. 2 is a cross-sectional view of the liquid crystal display showing the embodiment.
FIG. 3 is a block diagram of a display device showing the embodiment.
FIG. 4 is a sectional view of a display device showing a second embodiment of the present invention.
FIG. 5 is a schematic configuration diagram of a head-up display showing a conventional example.
FIG. 6 is a cross-sectional view of a display device showing a conventional example.
[Explanation of symbols]
21 Liquid crystal display (display)
22 Concave mirror (reflection mirror)
23 drive mechanism (angular position adjusting means)
24 Supporting member (shielding member)
24a Light shielding wall 24b Opening 25 Circuit board 26 Housing 27 Liquid crystal display element (display element)
31 Stepping Motor (Motor)
43 drive circuit 45 drive circuit

Claims (7)

A display device, comprising a circuit board, a housing that houses the display device and the circuit board, and a display device that displays a virtual image,
A display device, comprising a shielding member for preventing the circuit board from being irradiated with light. The display device according to claim 1, wherein the display has a display element, and a drive circuit for driving the display element is mounted on the circuit board. The display device according to claim 1, further comprising: a reflecting mirror that reflects display light emitted by the display; and an angle position adjusting unit that adjusts an angle position of the reflecting mirror. The display device according to claim 3, wherein the angular position adjusting means has a motor, and a drive circuit for driving the motor is mounted on the circuit board. The display device according to claim 1, wherein the circuit board is fixed to the shielding member. The display device according to claim 1, wherein the display is fixed to the shielding member. The display device according to claim 1, wherein the shielding member has a light-shielding wall having an opening through which display light emitted from the display passes.

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