JPH096260A - Display device - Google Patents

Abstract

(57) [Abstract] [Purpose] High-quality LED that enables high-quality display in which dots (light) do not appear discontinuous at low cost and is inexpensive compared to multicolor display devices. An object is to provide a display device. [Composition] A translucent diffusion cover provided with a large number of irregularities is installed on the front surface of an LED panel in which a plurality of LEDs are arranged,
In addition, a light source body having a color different from that of the LED having an optical path intersecting the optical path of the LED is installed around the LED panel.

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 lighting a plurality of LEDs.

[0002]

2. Description of the Related Art Conventionally, since an LED display device is a device that displays and provides information to an unspecified number of people, there has been a problem how to provide information to as many people. Therefore LE
The D display device has used multi-colored LEDs and scrolled images and characters to be displayed to attract attention and provide information to many people. However, in recent years, not only providing information to many people, but also providing information with higher image quality has become an issue. Images or characters are displayed on the LED display device by selectively emitting light from a plurality of LEDs arranged in a matrix in the vertical and horizontal directions. That is, an image or a character is formed by a set of dots (light). This means that the more the number of LEDs used per unit area, the finer the quality of the image can be displayed. Therefore, recently, in order to obtain a high-quality display, an LED with a smaller mounting area on a substrate is used.
Power supply or GND for each LED interval on the board
The minimum interval is set in consideration of the above. Further, a high-quality display device uses a large number of LEDs as compared with a display device other than a high-quality display device, and therefore does not use multiple colors in terms of cost and uses a single color (especially a red single color).

[0003]

In such a conventional display device, even though it is a high image quality display device, since it is a set of points (lights), the points (lights) appear when viewed close to the display device. You can see that they are discontinuous. In addition, since the display is only a single color (especially a red single color) in terms of cost, the display is monotonous, and it is less noticeable than a multi-color display that does not have high image quality, resulting in a display device accompanied by an inexpensive image. It's closed.
The present invention enables high-quality display in which dots (light) do not appear discontinuous even when viewed from a display device at low cost, and has a low-cost image even when compared with a multicolor display device. It is an object of the present invention to provide an LED display device having high cost.

[0004]

In a display device capable of displaying an image or a character by emitting light from each LED in an LED panel in which a plurality of LEDs are arranged, said LE
A light-transmitting diffusion cover having a large number of irregularities is installed on the front surface of the D panel, and a light source of a color different from that of the LED having an optical path intersecting the optical path of the LED is installed around the LED panel.

According to the present invention, an LED in which a plurality of LEDs are arranged
By installing a translucent diffusion cover with a large number of irregularities on the front surface of the panel, the light emitting area of each LED is diffused, and each light of an image or character, which was a collection of discontinuous points (light), is completely It is possible to make a high-quality display in which the dots are not discontinuous even when they are close to the display device and can be seen when they are close to the display device. In addition, by installing a translucent diffusion cover with a large number of irregularities, LE per unit area can be improved.
It is possible to reduce the number of D to be used and to provide an LED display device using a multicolor LED by installing a light source body of a color different from the emission color of the LED having an optical path intersecting the optical path of the LED around the LED panel. By comparison, it is possible to provide a low-cost LED display device, which has no image of a low-priced product and has a high degree of attention, and which transmits the light of the LED diffused through the diffusion cover which is translucent and provided with a large number of irregularities, and the light source body. It is possible to obtain a soft contrast different from that of a display device using a multicolored LED in which light is mixed.

[0005]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a perspective view of a practical use example of the present invention.
FIG. 2 is a cross-sectional view of a practical use example of the present invention.

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

The diffusion cover 2 is made of a resin such as acrylic or polycarbonate, and the unevenness is 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 varies depending on the shape and material of the unevenness of the diffusion cover 2 and the light emitting area of the LED 3, and L
It is installed in consideration of the degree of diffusion of the light emitting region of ED3.

The color fluorescent lamps 5a, 5b are not directly visible from the front of the display device, and the light of the LED 3 diffused through the concavo-convex optical lens and the light of the color fluorescent lamps 5a, 5b are mixed to obtain a soft contrast. In consideration of the fact that the color fluorescent lamp 5a is located on the upper front of the LED panel 4 diagonally,
The color fluorescent lamp 5b is installed diagonally below 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 surface 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 obtainability, 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 region of the LED 3 without the diffusion cover 2 according to the present invention. FIG. 4 is a cross-sectional view of the light emitting region of the LED 3 with the diffusion cover 2 according to the present invention. Adjacent L when there is no diffusion cover 2
The light emitting areas of the ED3 do not intersect with each other and look like a collection of discontinuous points (light) when viewed from the front.
In some cases, the light emitting areas of the LEDs 3 intersect with each other and when viewed from the front, each light appears to be in a completely connected state.

In this embodiment, color fluorescent lamps 6a, 6a
Although light of a different color from LED 3 was formed using b, a white fluorescent lamp was used in place of the color fluorescent lamps 6a and 6b, and a color different from that of LED 3 was applied around the white fluorescent lamp. Another method is also used to form light of different colors using the above film.

The LED 3 has a single color, especially red,
The color fluorescent lamps 5a and 5b have different colors from the LED 3, and the color fluorescent lamps 5a and 5b may have the same color or different colors. In particular, blue or green is used as the same color. The red emission attracts attention in the daytime, but at night it does not attract the attention as much as possible even if it emits light with maximum brightness. Therefore, the red emission during the day attracts attention and the lights of the color fluorescent lamps 5a and 5b at night. Attract attention.

[0014]

According to the present invention, a light-transmitting diffusion cover provided with a large number of irregularities is installed on the front surface of an LED panel in which a plurality of LEDs are arranged, thereby diffusing the light emitting area of each LED and discontinuous points ( Light or images can be made into a state in which each light is completely connected to each other, and it is possible to realize high-quality display in which dots do not appear discontinuous even when viewed close to the display device. . In addition, the number of LEDs used per unit area can be reduced by installing a light-transmitting diffusion cover provided with a large number of concavities and convexities.
L with an optical path that intersects the optical path of the LED around the ED panel
By arranging a light source of a color different from the ED emission color, multicolored L
It is possible to provide a low-cost LED display device with a high degree of attention that does not have a low-cost image compared to an LED display device using an ED.
The light of the ED and the light of the light source unit are mixed, and a soft contrast different from that of a display device using a multicolor LED can be obtained.

[Brief description of drawings]

FIG. 1 is a front view of a practical use example of the present invention.

FIG. 2 is a side view of a practical use example of the present invention.

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

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

[Explanation of symbols]

 1 Display Frame 2 Diffusion Cover 3 LED 4 LED Panel 5a, 5b Color Fluorescent Lamp 6a, 6b Reflector

Claims (1)

[Claims] 1. An LED panel in which a plurality of LEDs are arranged,
In a display device capable of displaying an image or characters by making each LED emit light, a translucent diffusion cover provided with a large number of irregularities is installed on the front surface of the LED panel, and the LED cover is provided around the LED panel. A display device having a light source body of a color different from that of an LED having an optical path intersecting the optical path.