JP2002050206A - Surface light-emitting display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a display device having a light-emitting surface which is lightweight and capable of emitting light from its surface with a small consumption of power, and without having a light source glowing. SOLUTION: On the top of the hollow, cubic body, which is equipped with plural light-emitting diodes (3) at the inner side suitably spaced apart from each other, with a diffusion sheet (4) spread diagonally from the bottom surface toward the upper surface, and with a light-translucent diffusion sheet (2) on the upper surface, a prismatic reflexive reflective material (1) is provided, one side of which has a number of triangle cones formed thereon that realize the principle of refracting light through the agency of the prism, with the prism layer facing downward.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a self-luminous surface-emitting display device which needs to be illuminated at night or in a dark place.

[0002]

2. Description of the Related Art Conventionally, there has been a self-luminous surface emitting display device using a fluorescent lamp, an incandescent bulb, and a light emitting diode.

[0003]

This has the following disadvantages. (B) A self-luminous surface-emitting display device using a fluorescent lamp or an incandescent bulb consumes a large amount of power. (B) A self-luminous surface-emitting display device using light-emitting diodes cannot uniformly emit light on a display surface unless a light guide plate is used, and the display plate itself becomes heavy due to the weight of the light guide plate. I have. (C) Self-luminous surface-emitting display devices using fluorescent lamps, incandescent bulbs, or light-emitting diodes do not emit light when there is a problem such as the power supply being stopped or the bulb being cut off. Can not. The present invention has been made to eliminate these disadvantages.

[0004]

Means for Solving the Problems A hollow cube having four sides and having a square bottom is provided with a plurality of light emitting diodes (3) at appropriate intervals on one inner side surface or on both diagonal surfaces. Provided. A diffusion sheet (4) that does not transmit light is provided obliquely from the inner bottom surface to the upper surface of the hollow cube. A light-transmitting diffusion sheet (2) is provided on the upper surface of a hollow cube having four sides and a square bottom, and the principle of refracting light by the action of a prism on the light-transmitting diffusion sheet is used. A prism type retroreflective material (1) formed by molding a large number of triangular pyramids on one side is provided so that the prism layer is located below. The present invention is a box-shaped surface-emitting display device having the above configuration.

[0005]

The light emitted from the plurality of light emitting diodes (3) provided on the side surface is applied to the diffusion sheet (4) provided obliquely from the bottom to the upper surface, and the direction of the light is changed upward. The directed light is passed through the light-transmitting diffusion sheet (2), averaged by the upper light-emitting portion, transmitted through the prismatic retroreflective material (1), and projected to the outside. Further, the light from the outside is refracted by the prism layer of the prism type retroreflective material (1), and the light is returned in the direction in which the light has entered.

[0006]

Embodiments of the present invention will be described below. (A) A light-emitting diode (3) is provided at an appropriate interval on one of the inner side surfaces or on both diagonal inner side surfaces of a hollow cube having four side surfaces that do not transmit light and having a rectangular bottom. Provide a plurality. (B) A diffusion sheet (4) that does not transmit light is provided obliquely from the inner bottom surface to the upper surface of the hollow cube. (C) A light-transmitting diffusion sheet (2) is provided on the upper surface of a hollow cube having four sides and a square bottom. (D) On a light-transmitting diffusion sheet (2), a prism type retroreflective material (1) formed on one side of a large number of triangular pyramids utilizing the principle of refracting light by the action of a prism is provided. Is provided below. When the present invention is used in the above structure, the light emitted from the plurality of light emitting diodes (3) provided on the inside of the side surface is transmitted to the diffusion sheet (4) provided obliquely from the bottom to the top. The light is directed upward by fine irregularities on the surface, and the upwardly directed light is passed through the light-transmitting diffusion sheet (2) and averaged by the top light-emitting portion, thereby forming a prismatic retroreflective sheet. (1)
And emits light to the outside. Light from the outside is refracted by the prism layer of the prism type retroreflective material (1), and returns light in the direction in which the light has entered.

[0007]

The surface light emitting display device of the present invention can be used by diffusing a point light source of a light emitting diode on a surface without using a light guide plate, so that it is light and consumes little power. Therefore, light can be emitted for a long time even when a dry battery is used as a power supply, so that it can be used for various purposes. For example,
The light emitting part is printed and can be used as an advertising signboard that can be attached to a backpack type bag. In addition, when power supply is cut off during a disaster, the display surface emits light evenly with dry batteries. The present invention is useful if it is used to display medical facilities, emergency shelters, and restricted areas. In addition, when using a fluorescent lamp or a light bulb, there is a fear that the light bulb will run out, but there is no fear that the light emitting diode will burn out. Can be uniformly emitted. Also, even when the power is turned off, the prism type retroreflective material provided on the surface can reflect the external light such as the light of the car and make the surface look bright, making it a display that requires safety. Also helps. For example, in the event of a traffic accident, a bicycle may be headed to the accident site by bicycle from a nearby police box, but there is no indication for the passing vehicles at the site, which is dangerous when working on the road. Was. But,
Even in such a case, the present invention is lightweight, emits light even with a dry battery, and reflects light even when the power is turned off, so that it is possible to illuminate the display on a passing vehicle and display it on the vehicle, and it is safe to work on the road. It is possible to do it.

[Brief description of the drawings]

FIG. 1 is a perspective view showing the structure of the present invention.

FIG. 2 is a structural sectional view of the present invention.

FIG. 3 is a diagram showing movement of light according to the present invention.

[Description of Signs] 1 prism-type retroreflective material 2 light-transmitting diffusion sheet 3 light-emitting diode 4 diffusion sheet

Claims (1)

[Claims] 1. A diffusion sheet (4) is provided diagonally from the bottom surface to the top surface of a hollow cube having a light emitting diode (3) provided on an inner side surface, and a light-transmitting diffusion sheet (2) is provided on an upper portion of the hollow cube. ), And a box-shaped surface-emitting display device provided with a prismatic retroreflective material (1) on a light-transmitting diffusion sheet.