JP3235949B2 - Display device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an LED display device for displaying images or characters by turning on a plurality of LEDs.

[0002]

2. Description of the Related Art Conventionally, since an LED display device is a device for displaying and providing information to an unspecified number of people, it has been a problem how to provide information to as many people as possible. Therefore LE
D display devices have attracted attention by using multi-colored LEDs or scrolling displayed images and characters, and have provided information to many people. However, in recent years, it has become an issue not only to provide information to a large number of people but also to provide information with higher image quality display. The image or the character display in the LED display device is displayed by selectively emitting a plurality of LEDs arranged in a vertical and horizontal matrix for each LED. That is, images and characters are formed by a set of dots (light). Therefore, the more the number of LEDs used per unit area, the finer the quality of the display. Therefore, recently, in order to obtain a high-quality display, an LED having a smaller mounting area on a substrate has been used.
Use the power supply and GND between the LEDs on the board.
The minimum interval is set in consideration of the above factors. Further, a display device of high image quality uses a single color (especially, a single color of red) without using multiple colors in terms of cost because the number of LEDs used is much larger than display devices other than those of high image quality.

[0003]

In such a conventional display device, even if it is a high-quality display device, the display device is a set of points (light). You can see that it is continuous. In addition, since the display is only a single color (especially, a single red color) in terms of cost, the display is monotonous, and the display device is less noticeable than a multicolor display that does not have high image quality and has a low-cost image. I'm done.
The present invention enables high-quality image display in which dots (light) do not appear discontinuously even when approaching a display device at low cost, and has a low degree of attention that has no low-priced product image as compared with a multicolor display device. It is an object to provide a high LED display device.

[0004]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention relates to a display device which arranges a plurality of LEDs on an LED panel and emits an image or character by emitting light from each LED. A display frame having an opening corresponding to the light emitting surface of the LED panel and covering the LED panel, a diffusion cover made of a light-transmitting plate having a large number of irregularities on the surface and closing the opening, A diffusion cover and an LED panel, which are provided around the light source body and emit light having a different emission color from the LED, and a reflector that reflects light emitted from the light source toward the front of the LED panel, and covers an opening. A display device is proposed in which a space is provided between a light emitting surface and a light emitted by an LED and a light emitted by a light source are mixed in this space.

According to the above proposal, the light emitted from the LED on the LED panel and the light emitted from the light source disposed around the LED panel are mixed in the space formed in front of the LED panel, Irradiate from the opening through the diffusion cover.

[0005]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a perspective view of an embodiment of the present invention.
FIG. 2 is a sectional view of an embodiment of the present invention.

Reference numeral 1 denotes a display frame formed in an appropriate square shape, and a front portion of the display frame 1 is closed by a light-transmitting diffusion cover 2 provided with a large number of irregularities. In the display frame 1, reflectors 6a and 6b for irradiating the LED panel 4 on which a plurality of LEDs 3 are arranged, the color fluorescent lamps 5a and 5b, and the colored lights of the color fluorescent lamps 5a and 5b toward the front surface of the LED panel 4 efficiently. Is provided. Although not shown, a drive circuit unit for driving the LED panel 4 and the like and a power supply unit are provided.

The diffusion cover 2 is made of a resin such as acryl or polycarbonate, and the irregularities are very fine and irregularly provided.

The LED panel 4 is installed so that the optical axis of the LED 3 and the diffusion cover 2 are perpendicular to each other. The distance between the LED panel 4 and the diffusion cover 2 differs depending on the shape and material of the unevenness of the diffusion cover 2 and the light emitting area of the LED 3.
The ED 3 is installed in consideration of the degree of diffusion of the light emitting region.

The color fluorescent lamps 5a and 5b are not directly visible from the front of the display device, and the light of the LED 3 transmitted and diffused through the concave / convex optical lens is mixed with the light of the color fluorescent lamps 5a and 5b to obtain a soft contrast. In consideration of the fact that the color fluorescent lamp 5a is provided diagonally in the upper front of the LED panel 4,
The color fluorescent lamp 5b is installed diagonally in the lower front of the LED panel 4.

The reflectors 6a and 6b for efficiently irradiating the colored light of the color fluorescent lamps 5a and 5b toward the front of the LED panel 4 are formed in a substantially U-shape, and have the same contrast as the color fluorescent lamps 5a and 5b. In consideration of the availability, they are installed so as to cover the color fluorescent lamps 5a and 5b, respectively.

FIG. 3 is a sectional view of the light emitting area of the LED 3 without the diffusion cover 2 according to the present invention. FIG. 4 is a sectional view of a light emitting area of the LED 3 when the diffusion cover 2 according to the present invention is provided. If there is no diffusion cover 2, the adjacent L
The light-emitting areas of the ED 3 do not intersect with each other and appear as a group of discontinuous points (light) when viewed from the front. However, when the diffusion cover 2 is provided, the light-emitting areas of the LEDs 3 intersect with each other and each one when viewed from the front. Lights appear to be completely connected.

In this embodiment, the color fluorescent lamps 5a, 5a
b is used to form light of a different color from LED3, but a white fluorescent lamp is used instead of the color fluorescent lamps 5a and 5b, and a color different from that of LED3 is provided around the white fluorescent lamp. A method of forming light of another color using the above film is also used.

[0013] The LED 3 is a single color, especially red,
The color fluorescent lamps 5a and 5b are different colors from the LED 3, and the color fluorescent lamps 5a and 5b may be the same color or different colors. Particularly, the same color blue or green is used. The red emission attracts attention in the daytime, but cannot be noticed as much as expected even if it is emitted at the maximum brightness at night. Therefore, the red emission emits attention in the daytime and the light of the color fluorescent lamps 5a and 5b at night. Attracts attention.

[0014]

According to the present invention, the LE on the LED panel is
The light emitted from D and the light emitted from the light source disposed around the LED panel are mixed in a space formed in front of the LED panel, and emitted from the opening through the diffusion cover. As a result, the light of the LED and the light of the light source body (emission color different from that of the LED) are mixed, and the multicolor LE
It is possible to obtain a high degree of attention comparable to that of a display device using D. In addition, since the mixed light passes through the diffusion cover, a soft contrast that is not available in conventional high-quality display devices and multicolor display devices can be obtained. Furthermore, since there is a space between the LED on the LED panel and the diffusion cover of the opening, the light emitted from the LED is sufficiently diffused, and the LED emitting light is seen as a discontinuous point. Can be prevented.

[Brief description of the drawings]

FIG. 1 is a front view of an embodiment of the present invention.

FIG. 2 is a side view of an embodiment of the present invention.

FIG. 3 is a cross-sectional view of a light emitting area of an LED without a diffusion cover according to the present invention.

FIG. 4 is a sectional view of a light emitting area of an LED with a diffusion cover according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Display frame 2 Diffusion cover 3 LED 4 LED panel 5a, 5b Color fluorescent lamp 6a, 6b Reflector

Claims (1)

(57) [Claims] A plurality of LEDs arranged on an LED panel;
In a display device that emits an image or a character by emitting light from each LED, a display frame including an opening corresponding to a light emitting surface of the LED panel and covering the LED panel, and a light-transmitting surface having a number of irregularities on the surface are provided. A diffusion cover made of a conductive plate, which closes the opening, a light source body provided around the LED panel and emitting light of a color different from the emission color of the LED, and directing light emitted from the light source toward the front of the LED panel. A display that includes a reflector that reflects light from the light source, and a space is provided between the diffusion cover that covers the opening and the light emitting surface of the LED panel, and the light emitted by the LED and the light emitted by the light source are mixed in this space. apparatus.