JPH0650952U - Head-up display device with automatic light control function for vehicle - Google Patents

Abstract

(57) [Summary] A rearview mirror mounted on the windshield 7 or near the front windshield is used with an optical sensor with its light-receiving surface facing forward and forward, an optical sensor drive transmission circuit, and a solar cell. A head-up display device capable of improving the legibility of information display by appropriately measuring the background brightness of the information display section and optimally controlling the information display brightness by installing the vehicle at a predetermined position in the vehicle interior. To provide.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a head-up display device having a vehicle automatic light control function.

[0002]

[Prior art]

 As a conventional head-up display device having this type of vehicle automatic light control function, there is, for example, one shown in FIGS. This is provided with a main body case 3 having an opening 2 on the upper surface inside an instrument panel 1 installed in front of a driver's seat, and inside the main body case 3, a sub display by a fluorescent display tube is provided. A display unit 4 and a plane mirror 5 for reflecting a display image from the sub-display unit 4 are arranged, and a transparent cover 6 for preventing dust from entering the main body case 3 in the opening 2. The projector 16 provided with is formed. Further, a translucent reflection plate (combiner) 8 as a half mirror is provided on the inner surface of the windshield 7 located above the instrument panel 1, and the display image of the sub-display 4 is transmitted to the plane mirror 5 and the translucent light. The image is displayed by the display 4 together with the scene in front of the vehicle by reflecting the light with the reflective reflector 8.

Also, in order to prevent the display itself from being displayed by the projector 16 from becoming difficult due to changes in the brightness of the background of the display portion, such as being too bright and dazzling, invisible in the dark, and difficult to see in the evening double image. It is configured to detect the brightness of external light using the optical sensor 11 placed on the upper part of the ment panel, and to automatically adjust the brightness according to the detected output so as to keep the ratio of display brightness and external light constant. Has been done.

Reference numeral 9 is provided inside the instrument panel 1, for example, an analog or digital main display for displaying vehicle speed engine speed, etc., and 15 is the main display 9 and the sub-display. A display controller for driving the device 4, 17 is a sensor for driving the sub-displays and the main displays 4, 9, 10 is an optical sensor drive circuit, 12 is a head-up display finisher, and 13 is a vehicle body roof.

[0005]

[Problems to be solved by the device]

 However, in such a conventional head-up display device having an automatic light control function for a vehicle, the optical sensor 11 for automatically adjusting the brightness of the display device according to the external light brightness is used as the instrument. Since the light receiving surface 11 ′ is provided upward in the panel 1 due to a space problem due to the size of the optical sensor 11, for example, when an automobile travels with the sun 20 in the back, as shown in FIG. At the same time, the light sensor 11 installed on the instrument panel 1 enters the shade by the roof 13 of the automobile, which causes the measured brightness value of the light sensor 11 to decrease. There was a problem that the brightness was dimmed so that it could not adjust to the change in the reflection of the background of the information display part due to the external light, and the display brightness could not be optimally controlled and the display was difficult to see.

[0006]

[Means for Solving the Problems]

 The present invention has been made in view of such a conventional problem, and an optical sensor in which a light receiving surface is directed to the front and the front in the front glass 7 or a rearview mirror used near the windshield is used. By installing this rearview mirror at a predetermined position in the vehicle interior by integrating the sensor drive transmission circuit and the solar cell, the background brightness of the information display section is properly measured and the information display brightness is optimally controlled. It is to provide a head-up display device capable of improving visibility.

[0007]

【Example】

 Hereinafter, the present invention will be described in detail with reference to the embodiments shown in the drawings.

First, the configuration of the present embodiment will be described with reference to FIG. 3. The same parts as the structure of the present embodiment and the structure described in the conventional example are denoted by the same reference numerals as those in the conventional example, and the same parts will be described. The description of the structural part is omitted.

That is, in the present embodiment, the optical sensor 11 ′ having the light receiving surface of the optical sensor facing the front of the vehicle and the optical sensor 11 ′ are driven to convert a detection signal of the optical sensor into a radio wave and transmit the radio wave to the control unit. The optical sensor drive transmission circuit 18 is integrally provided on the room mirror 14, and the optical sensor 11 ′ and the optical sensor drive transmission circuit 18 are arranged on the back of the room mirror 14, and the optical sensor and the transmission circuit A solar cell 19 for obtaining a power source for operating the optical sensor and the transmission circuit is attached to the upper part, with its light-receiving surface facing the upper part of the windshield.

Further, the display controller 15 ′ is provided with a receiving device (not shown) that receives the photosensor detection signal.

The above is the configuration of the present embodiment, and the operation will be described below.

In FIG. 3, the display light emitted from the display 4 which is a fluorescent display tube passes through the representative optical path b, the optical path is bent by the plane mirror 5, and the representative optical path a. The display light that has passed through the representative optical path a is incident on a point P on the inner surface of the windshield 7, and the translucent reflector 8 can read the display image on the display 4 together with the scene in front of the vehicle.

Further, in order not to make it difficult to visually recognize the display image on the display device, the light receiving surface is directed toward the information display portion, and the light sensor 11 ′ integrally attached to the rearview mirror is used to detect external light in the front direction of the vehicle. An optical sensor drive transmission circuit 18 incorporated and integrated with the optical sensor converts the detection signal of the optical sensor 11 ′ into a radio signal and transmits it to the display controller 15. The display controller is equipped with a receiving device (not shown), and the transmitted radio wave signal is converted into an electric signal, and the display controller is driven according to the detection output of the optical sensor to display brightness and external light. The information display is automatically dimmed to keep the ratio constant. The power for driving the optical sensor 11 ′ and the optical sensor drive transmission circuit 18 is supplied by the solar cell 19 integrally attached to the room mirror 14.

[0014]

[Effect of device]

 As described above, according to the present invention, information display such as characters and figures is reflected by the windshield 7 of the vehicle or the translucent reflection plate 8 provided in front of the windshield to project a virtual image display image in front of the windshield. A projector 16 is provided in the instrument panel 1, and an optical sensor 11 'for automatically adjusting the display brightness of the projector 16 is provided so as to have an automatic light control function for displaying the information in superposition with the external scene. In the head-up display device, an optical sensor 11 ′ having a light receiving surface facing the front of the vehicle, an optical sensor drive signal transmission circuit 18, and a solar cell 19 are attached to the front glass 7 or the windshield in the vicinity of the rearview mirror 14 used. Since it is provided physically, by installing this room mirror 14 at a predetermined position, for example, Even when the optical sensor 11 'mounting part is in the shade when traveling with the back of the sun 20, since the optical sensor faces the front direction of the vehicle, it is possible to take in external light in the front direction of the vehicle. The effect is that the background brightness of the display section is properly detected, the brightness of the display is accurately adjusted according to the brightness of the background of the information display section, and the visibility is improved.

Further, since the optical sensor 11 ′ is arranged below the solar cell attached to the windshield, direct light is not emitted to the optical sensor 11 ′ during the daytime when the sunlight is strong. The optical sensor is not affected by the temperature change due to the direct irradiation, and thus the characteristic of the optical sensor is not changed, and the automatic dimming with excellent reliability is performed.

[Brief description of drawings]

FIG. 1 is a structural explanatory view of a conventional head-up display device.

FIG. 2 is an explanatory view of the operation of a conventional example.

FIG. 3 is a structural explanatory view of a head-up display device of this embodiment.

[Explanation of symbols]

11 '... Optical sensor 14 ... Interior mirror 15' ... Display controller 18 ... Optical sensor drive transmission circuit 19 ... Solar cell

Claims (1)

[Scope of utility model registration request] 1. A projector for projecting a virtual image display image in front of a windshield (7) of a vehicle or a translucent reflector (8) provided in front of the windshield to reflect information such as characters and figures. (16) is provided in the instrument panel (1), and further provided with an optical sensor for automatically adjusting the display brightness of the projector, and is provided with an automatic light control function of displaying the information in superposition with the scenery of the outside world. In the head-up display device, an optical sensor (1
1 '), an optical sensor drive signal transmission circuit (18), and a solar cell (19) are integrally mounted on a room mirror (14), which is a head-up display device having an automatic light control function.