JPS638036A - Display device for automobile - Google Patents

Abstract

PURPOSE:To improve visibility of a display unit by arranging one end of an optical fiber as a light receiver to the forward direction of a car whereby connecting the other end of the optical fiber with a photo sensor. CONSTITUTION:Outside light 7 is received by a receiving section 20, is sent to a photo sensor 2 via an optical fiber 21, is photo-electrically transferred by the photo sensor 2 therein so as to be applied to the dimming circuit 10 of an indicator 1 as an outside light intensity signal. And the indicator 1 is dimmed in proportion to its brightness depending on said outside light intensity signal. In this state, as outside light 7 contains mainly incident light from the road surface 5 in front of a car, the brightness corresponding to the brightness of the road surface in front of the car is displayed on the indicator 1. Accordingly, a driven can make sure visibly of the content displayed by the indicator 1 continuously under any condition of outside light.

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention relates to dimming that changes the brightness of instrument panel illumination in automobiles, and in particular to an automobile display device that automatically adjusts the brightness according to the intensity of outside light. It is related to.

[Conventional technology]

Figure 2 shows, for example, a magazine (Mitsubishi Gear Run, Eterna Σ, Maintenance Manual, Electrical Wiring Cause and Effect, '84-11.410387
72) K is a configuration diagram showing a conventional automobile display device, in which +11 is a dimming circuit Ql that changes the brightness of the display illumination according to the light intensity detected by the optical sensor (2). A display device (2) is integrated with the light receiving section (■), and a light sensor attached to the dash board (3);
(4) is the driver, (5) is the foreground, (6) is the frosted glass, and (7) is the external light that enters the light receiving part (support) of the optical sensor (2).

Next, the operation will be explained. The external light (7) reaches the light receiving part ■, and the external light intensity signal photoelectrically converted by the optical sensor (2) is supplied to the dimmer circuit αq of the display (1), and when the external light intensity is large, the external light intensity signal is When the illumination is strong, a bright display is achieved, and when it is small, the illumination is weakened, a dark display is achieved. On the other hand, since the intensity of external light (7) is expected to be roughly proportional to the brightness of the foreground (5), the driver (4)
It is expected that with visual acuity adapted to the foreground (51), it will be possible to relatively easily see the front fangs on the display +11, which change proportionally to the brightness of the foreground (5).

[Problem that the invention seeks to solve]

Conventional automobile display devices are configured as described above, so for example, near the exit of a tunnel, even though the foreground (5) is bright, the outside light (7) is still weak, so the display becomes dark (h1). On the other hand, although the foreground (5) near the entrance to Toshinel is nearly pitch black, the outside light (7) is still strong enough that the display becomes relatively dazzling and the visibility of the display may become extremely poor. There was a problem.

This invention was made to solve the above-mentioned problems, and it is possible to accurately track the brightness of the display in proportion to the brightness of the foreground, especially the road surface, under all external light conditions. The purpose of this invention is to obtain a display device for automobiles that can be used in automobiles.

[Means for solving problems]

The automobile display device according to the present invention has a light receiving section as one end of an optical fiber, the other end of this optical fiber is connected to a light sensor, and the light receiving section is arranged toward the front of the vehicle to detect light in front of the vehicle. It is designed to receive light.

[Effect]

Since the light receiving section in this invention is arranged toward the front of the vehicle, it mainly receives light incident from the road surface in front of the vehicle. Therefore, the brightness of the display's illumination varies proportionally depending on the roughness of the road ahead, which the driver is gazing at most of the time.

〔Example〕

Now, a display device for an automobile according to an embodiment of the present invention will be explained with reference to the drawings. As shown in Fig. 1, the light receiving part (2) of the optical sensor (2) is placed on the ceiling near the top of the windshield (6), in this case near the rearview mirror (2), so as to face the road surface (51) in front of the vehicle. In addition, in this embodiment, the light receiving section (2) is one end of the optical fiber Qυ, the other end of this optical fiber is connected to the optical sensor (21), and the optical sensor (2) is connected to the light control circuit section. The optical fiber (211) is connected to the dash board (3) together with the display device (11) equipped with a has reached.

Next, the operation will be explained. The external light (7) is received by the light receiving part, passes through the optical fiber +2B, reaches the optical sensor (2), is photoelectrically converted by the optical sensor (21), and is sent to the display (dimmer circuit of 11) as an external light intensity signal. The display (11) is dimmed proportionally to its brightness according to this external light intensity signal.
Since the light that enters from 51 is mainly included, the display (11)
For example, when the road surface (5) is relatively unused, a relatively bright display is achieved, and when the road surface (51) is relatively dark, a relatively dark display is achieved.

Therefore, the driver (4), whose eyes have adapted to the brightness of the road surface (51) in front of the vehicle, always sees the display (1) displaying a brightness that changes in proportion to the brightness of the road surface (5). Therefore, the display contents of the display device (11) can be more accurately viewed.

Note that the optical processor (2) may be a photodiode or a phototransistor, which is a photoelectric conversion element. Use cadmium sulfide, etc.

Further, in the above embodiment, the light receiving section (2) is at the end of the optical fiber, but the same effect can be obtained even if a lens-shaped condenser is provided at the tip of the optical fiber in order to strengthen the directivity.

Further, in the above embodiment, the light receiving section (2) was attached near the rearview mirror, but the same effect can be obtained even if it is attached near the rearview mirror or near the air intake port on the front of the vehicle.

Furthermore, if there is a so-called head-up display in which the display device (1) displays the display by reflecting the display on a glass glass +61 or a separately provided half mirror, the displayed image of the head-up display will be displayed on the road surface 151 in front of the vehicle. It is particularly effective because it is displayed in direct form, such as.

〔Effect of the invention〕

As explained above, according to the present invention, the light receiving section is one end of an optical fiber, the other end of this optical fiber is connected to the main body of the light sensor, and the light receiving section is arranged toward the front of the vehicle. Since the display device is configured to receive the light of 1000 yen, it is possible to obtain a display device for an automobile in which the contents of the display can be more accurately viewed. Furthermore, the fact that the display can be clearly recognized means that the time required to look at the display is short, which also has the effect of improving safety.

[Brief explanation of drawings]

9g1 is a schematic diagram of an automobile display device according to an embodiment of the present invention, and FIG. 2 is a schematic diagram of a conventional automobile display device. (1)...display unit, (2)...optical secessor, (31.
... Datsushi board, (4) ... driver, (51 ...
・Foreground, (6)...windshield, (7)...outside light, 賲...dimmer circuit, ■...light receiving section, (211...
・Optical fiber Note that the same reference numerals in each figure indicate the same or equivalent parts.

Claims (1)

[Claims] (1) In an optical sensor that photoelectrically converts light incident on the light receiving part, and a display whose display brightness changes according to the electrical output of this optical sensor, the light receiving part is one end of an optical fiber, and the light 1. A display device for an automobile, characterized in that the other end of the fiber is connected to an optical sensor, and the light receiving section is disposed facing forward of the vehicle to receive light from the front of the vehicle.