JPS63231484A - Light emitting display panel - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] Industrial Field of Application This invention enables a flexible installation location to be selected by using a cordless system that uses sunlight as a power source, and also automatically adjusts the installation location according to the degree of brightness and darkness of outside light. The present invention relates to a light-emitting display board that is configured to be able to turn on and off and is suitable for use especially outdoors.

PRIOR ART AND THEIR PROBLEMS Many advertising means and other decorative means displaying various characters, figures, and other forms (generally referred to as "information") are in use, and a typical example is one that is installed outdoors. There are advertising media such as billboards and neon signs. In many of these signboards, information such as letters and figures is imprinted on a display medium such as paper using printing or other means, and a plate-shaped support to which this medium is attached is installed in an outdoor location such as a cityscape or the wall of a building. It generally does not have a light emitting display function itself.

Therefore, in order to display information on the media to third parties at night, it is common to use fluorescent or incandescent lights to illuminate it from the outside, but this requires large-scale facilities. The disadvantage is that the installation cost is high. Further, as information display means using self-luminous light at night, neon signs and lighting display devices consisting of an opaque plate displaying information and a fluorescent lamp disposed on the back side of the plate are often used. This has a much better nighttime viewing rate and is most recommended as an advertising medium, but it inevitably requires a larger facility and has the same drawbacks as the above-mentioned costs.

Furthermore, as a means of display that is visible at night, it has been proposed to print characters, figures, and other shapes using ink mixed with reflective paint, but this method is designed to reflect external light. It is not a self-luminous type.

Therefore, there is a drawback that the visibility is not sufficient6.Object of the InventionThe present invention aims to provide a relatively small-scale luminescent display means at a low cost, which improves visibility outdoors, especially at night. purpose.

Means for Solving the Problems In order to overcome the above-mentioned problems and achieve the intended purpose, the light emitting display board according to the present invention is a light emitting board made of electroluminescence that emits light when excited by the application of an alternating current voltage. a light-transmitting display board located in front of the light-emitting surface of the light-emitting board and displaying information consisting of shapes such as letters and figures as a non-transparent part; an inverter for supplying alternating current voltage to the light-emitting board; A drive power source consisting of a rechargeable battery that supplies direct current to the inverter and a solar cell for charging the rechargeable battery with direct current, and on/off control of the drive power source according to the illuminance of external light, It is characterized by comprising an automatic dimming device that selectively turns on and off the light.

Embodiments Next, preferred embodiments of the light emitting display panel according to the present invention will be described below with reference to the accompanying drawings. As an example, a nameplate will be described in which the background part is illuminated at night to make the surname part stand out and ensure good visibility, but the present invention is not limited to this. isn't it.

FIG. 1 is a perspective view showing the general structure of the nameplate according to this embodiment.
In the illustrated nameplate, a flat box-shaped main body 10 made of resin, for example, has a display section 12 on which a required name (for example, "Takayama Abe") is written, and a power source for a light-emitting plate 14 (described later) made of electroluminescence. Solar cell 16 serving as a supply section
and are provided. Note that the illustrated example relates to a "collection nameplate" as described above, so the intercom 18,
A mail slot 20 and photoelectric conversion elements Cds, which will be described later, are arranged at appropriate locations.

FIG. 2 shows a longitudinal section taken along line u-n of the nameplate shown in FIG. It is being The display section 12 is made of, for example, a semi-translucent white resin plate, and information 12a consisting of a required name, etc. is printed on the surface of the plate with non-translucent paint (for example, black paint).
It is written as. On the back of this display section 12,
A light-emitting plate 14 made of electroluminescence is arranged with its light-emitting surface in close contact with the light-emitting plate 14.
As shown in the electrical circuit of FIG. 3, it is connected to the innovator 28 through a circuit block of the automatic point reduction device 26. The inverter 28 is also connected to a rechargeable battery 30, which is wired to the solar cell 16.

As is known, electroluminescence has a basic structure in which a light-emitting layer is sandwiched between a transparent electrode layer and a back electrode layer, and a lead electrode is connected to each of the two electrode layers. By applying an alternating current voltage, the light-emitting layer is electronically excited and emits light. The luminance of this light emitting layer changes brightness and darkness within a required range by changing the voltage or AC frequency of the applied AC voltage. Advantages of electroluminescence include that uniform surface emission can be obtained, it is thin and flexible, and it generates almost no heat.

The automatic point deduction device 2G is, for example, a cadmium cell (C
ds), and in the circuit shown in FIG. 3, the solar cell 16 receives daytime outside light and generates DC power, and the electrical energy is charged into the rechargeable battery 30, and further Direct current can be supplied to the inverter 28.

In the above circuit diagram, the photoelectric conversion element Cds constantly monitors the brightness of external light, and when the external light reaches a predetermined illuminance (for example, the ambient brightness at dusk that allows the display board to emit light), the photoelectric conversion element Cds constantly monitors the brightness of external light. When this happens, the base voltage of the transistor TR2 functioning as a switching element is lowered.

Therefore, the collector current of the transistor TR2 is cut off, and a voltage is applied to the base of the other transistor TR2 instead. Therefore, the transistor TR,
A collector current flows through (switch ON), and the converted AC voltage of the required frequency supplied from the inverter 28 is applied to both electrodes of the light emitting plate 14. Therefore, the light emitting plate 14
is excited and emits light.

Conversely, in this state, when dawn comes and the surrounding outside light reaches a predetermined illuminance, the photoelectric conversion element Cds senses this and turns on the transistor TR, and turns off the transistor TR1 to turn the light emitting plate 14 on. Turn off the lights.

In the case where the light-emitting display board according to the illustrated example is applied to a nameplate, during the day the solar cells 16 directly or indirectly receive sunlight (even on cloudy days) to generate direct current, and this electric power is The rechargeable battery 30 is charged.

However, since the transistor TR is turned FF, the inverter 28 does not operate and the light emitting plate 14 is not excited. At dusk, when the ambient brightness matches the illuminance preset by the variable resistors VR1 and VR2 in the circuit shown in Figure 3, the transistor TR2 turns OFF as described above.
As F operates, the transistor TR□ turns ON. Therefore, the inverter 28 is activated to excite the light emitting plate 14 and emit light to illuminate the information 12a such as the last name.

Note that the solar cell 16 used in the present invention charges the rechargeable battery 30 and drives the inverter 28 to supply a required excitation voltage to the light emitting plate 14 made of electroluminescence.

Therefore, the battery 16 is connected to the light emitting plate 14 used correspondingly.
Of course, it is necessary to have a capacity and size that can cover the amount of electricity consumed in one night.

FIG. 4 shows the display board according to the present invention used as a signboard for outdoor display. In this case, the solar cells 16 are arranged on the entire surface.

The light emitting plate 14 is positioned only on the back side of the area where various information is displayed.

According to the light emitting display board according to the present invention, since it uses a solar cell as a power source, there is no need for troublesome wiring work or battery replacement, and since it is cordless, installation locations can be freely selected. . Furthermore, since it uses solar cells and is configured to automatically turn on and off, the overall running cost can be achieved in the long run. Further, since the light emitting plate made of electroluminescence is thin and flexible, it can be suitably used in various modifications, for example, as an outdoor nighttime light emitting display.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing a schematic configuration when the light emitting display board according to the present invention is applied to a nameplate as a preferred embodiment, and FIG.
Figure 3 is a cross-sectional view of the nameplate shown in Figure 1 along vertical lines; Figure 3 is an electrical circuit diagram as an example used in the nameplate shown in Figure 1;
FIG. 4 is a perspective view showing a state in which the light emitting display board according to the present invention is used as a signboard for outdoor display. 10... Box-shaped main body 12... Display section 14...
Light-emitting board (electroluminescence) 16... Solar cell 18... Intercom 20... Mail slot
26...Automatic point reduction device 28...Inverter
30... Rechargeable battery Cds... Photoelectric conversion element FIo 1 ■Mi FIo, 2 FIG, 3 FIo, 4 (no rear drawing)

Claims (1)

[Claims] A light-emitting plate made of electroluminescence that emits light when excited by the application of an alternating current voltage, and a non-transparent portion located in front of the light-emitting surface of the light-emitting plate to display information consisting of shapes such as letters and figures. an inverter for supplying alternating current voltage to the light emitting plate;
A drive power source consisting of a rechargeable battery that supplies direct current to the inverter, and a solar cell for charging the rechargeable battery with direct current; A light-emitting display board comprising an automatic dimming device that selectively turns on and off the light-emitting board.