JPH06176609A - Display device - Google Patents

Abstract

PURPOSE:To provide a road sign which is visible without the limit of a viewing angle even from a nearby position by constituting the road sign of an optical sensor, a capacitor and light-emitting lamps. CONSTITUTION:An optical sensor 1, which receives light from an automobile headlight and converts it into current, is provided on the plate surface of a road sign 12, to convert light from the headlight into current so as to charge a capacitor 2. When the charging voltage rises above a predetermined value, a marker lamp 3 comprising light-emitting diodes is turned on. When an automobile comes close to the road sign 12, the marker lamp 3 does not depend on the light coming from the headlight and reflected there, but the marker, comprising light-emitting diodes that emit light by use of the current from the capacitor 2 charged by conversion of light from headlights, emits light, thus ensuring that the road sign is visible.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a display device, and more particularly to a display device including a light emitting diode (LED) lamp used for emergency lights, road signs, road advertisements and the like.

[0002]

2. Description of the Related Art Conventionally known road signs are designed to show a driver the shape of a road sign by reflecting the light from the headlights of an automobile with a paint applied to the surface of the road sign. There is. That is, the light receiving surface of the road sign also serves as a light emitting surface that emits reflected light.

[0003]

According to the above conventional road signs, for example, when a car runs toward the road sign, when the position of the car and the position of the road sign are close to each other, a light to the road sign is emitted. Depending on the irradiation angle of, the reflected light may not return to the driver. In other words, when a car approaches a road sign, the angle at which the road sign can be seen is limited.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a display device capable of viewing a display from near without limiting the viewing angle.

[0005]

In order to achieve the above object, the display device of the present invention comprises an optical sensor for converting light received from an approaching light emitter into a photocurrent and a photocurrent generated by the photosensor. It is composed of a capacitor to be charged and a light emitting lamp which emits light when the voltage of the capacitor becomes a predetermined value or more by the charging.

[0006]

According to this structure, for example, when an optical sensor provided on a road sign receives light from an approaching automobile headlight, a photocurrent flows through the photosensor, and the photocurrent is charged in a capacitor. When a predetermined time for charging has passed, the LED lamp emits light due to discharge from the capacitor. Before the light emission, the car approaches the road sign, but at the time of light emission, the driver sees the light from the LED lamp that emits light itself, so the figure of the road sign can be clearly seen from any angle. You can see.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A display device according to an embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a circuit diagram showing the configuration of the first embodiment of the present invention. The display device according to the present embodiment includes an optical sensor 1 that converts received light L into photocurrent as shown in FIG.
And a capacitor 2 that charges the photocurrent generated by the optical sensor 1, and an LED lamp 3 that emits light when the voltage of the capacitor 2 exceeds a predetermined value by charging.

FIG. 2 shows a road sign 12 using this embodiment.
FIG. In this embodiment, a plurality of LEs shown in FIG.
For the D lamp 3, the optical sensor 1 and the condenser 2
One of each of the resistor 3 and the resistor 3 is used. LE
The D lamp 3 has a plate 10 so as to form a figure of a road sign.
Is attached to. Thus, in this embodiment, the LED
Although the figure of the road sign 12 is displayed by the arrangement of the lamps 3, for example, the figure drawn on the plate 10 may be illuminated by the LED lamp 3. In addition, a paint (paint that efficiently reflects the light when the light hits) may be applied along the periphery of the figure drawn by the arrangement of the LED lamps 3. An optical sensor (for example, a photodiode) 1 connected to each LED lamp 3 is attached to the lower corner of the plate 10.

FIG. 3 is a schematic diagram showing the positional relationship between the road sign 12 and the automobile 20 when this embodiment is used for the road sign 12 (FIG. 2). Optical sensor 1 on road sign 12
However, when the light L from the headlight of the approaching automobile 20 (at the position A) is received, a photocurrent flows through the optical sensor 1, and the photocurrent is charged in the capacitor 2 (FIG. 1).

When the capacitor 2 shown in FIG. 1 becomes higher than a predetermined threshold voltage E (hereinafter referred to as "voltage E"), the LED lamp 3 is turned on by discharging the capacitor 2.
And emit light. In other words, the LED lamp 3 does not emit light until the capacitor 2 rises to the voltage E, and the emission is delayed by a predetermined time from the start of light reception. Voltage E
Is determined by the set value of the resistor 4, so that the delay time of light emission of the LED lamp 3 can also be determined by the set value of the resistor 4.

Therefore, when the light from the automobile 20 hits the optical sensor 1 at the position A shown in FIG. 3, the LED lamp 3 does not illuminate immediately, but when the light is emitted after the delay time elapses, the automobile 20 is in the position. You are approaching B. Therefore, at the position B near the road sign 12, the driver
You will see the light from the emitting LED lamp 3. Therefore, even if the angle at which the road sign 12 is viewed changes momentarily due to the movement of the automobile 20, the sign 12 can be clearly viewed from any angle. Particularly on a dark night road, when the LED lamp 3 emits light near the road sign 12, there is an advantage that the sign is easy to see and there is no oversight.

As described above, the light from the conventional road sign is the reflected light of the headlight of the automobile, and the viewing angle is limited, whereas in the present embodiment, the light from the automobile 20 is reflected. Light from the headlight to the light sensor 1 of the sign 12 and the LED lamp 3 of the road sign 12 from the automobile 20
Since the light source is different from the light that goes toward, it is possible to make the figure of the road sign 12 large or to set the installation state of the road sign 12 in an easy-to-see direction.

FIG. 4 shows a second embodiment of the present invention. The same parts as those in the first embodiment are designated by the same reference numerals. In this embodiment, a built-in type LED lamp 13 having a lead 5 provided with a capacitor 2 and a resistor 4 and an optical sensor 5 are provided. Then, one lead 5 is connected to the output terminal of the optical sensor 1, and the other lead 5 is connected to the ground. Like this, condenser 2 and resistor 4
Is integrated with the LED lamp, so that the display device can be easily assembled.

The first and second embodiments described above can be applied not only to road signs but also to large lamps, emergency lights including dot matrix type light source devices, road advertisements and the like.

[0015]

As described above, according to the present invention, the light received from the approaching light emitting body is converted into the photocurrent by the photosensor, and the photocurrent is charged by the capacitor. Therefore, the voltage of the capacitor is charged by the charging. The light emitting lamp, which emits light when the value exceeds a predetermined value, emits light with a delay from the time when the light sensor receives light. At the time of the light emission, the light emitter is located near for a delayed time, but since the light emitting lamp emits light by itself, it is possible to display from various angles without being restricted in viewing angle. It is possible to see.

[Brief description of drawings]

FIG. 1 is a circuit diagram showing a configuration of a first embodiment of the present invention.

FIG. 2 is a front view of a road sign in which the first embodiment of the present invention is used.

FIG. 3 is a diagram schematically showing a positional relationship between an automobile and a road sign when the road sign using the first embodiment of the present invention is used.

FIG. 4 is a diagram schematically showing the configuration of a second embodiment of the present invention.

[Explanation of symbols]

 1 ... Optical sensor 2 ... Capacitor 3, 13 ... LED lamp 4 ... Resistor 5 ... Lead 10 ... Board 12 ... Road sign 20 ... Car

Claims (1)

[Claims] 1. An optical sensor for converting light received from an approaching light emitter into a photocurrent, a capacitor for charging the photocurrent generated by the photosensor, and a voltage of the capacitor being a predetermined value or more due to the charging. A display device comprising a light-emitting lamp that emits light.