JPH06118885A - Public large-sized display device - Google Patents

Abstract

PURPOSE:To provide the device which can be driven by a simple mechanical structure, and can express image information by many colors. CONSTITUTION:The device is provided with many endless belts 2 in which a part exposed on a screen 1 is arrayed like a matrix, and a step-motor 3 which is arranged in its inside, respectively and moves forward and backward each endless belt 2, and in the endless belt 2, many display surfaces 21a, 21b, 21c,... whose colors are different are divided and colored in its moving direction. Desirably, the endless belt 2 is formed by a translucent film and a backlight means 5 is arranged in its inside.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a large-sized display device for a large number of spectators, which is used, for example, for advertisement in the outdoors or for notifying the degree of air pollution.

[0002]

2. Description of the Related Art As a large-sized display device of this type, hundreds of display elements each of which is composed of a cube whose surface is colored differently are arranged in a matrix, and each display element is arranged around a horizontal axis and a vertical axis. There is a type in which various image information such as a character pattern or a figure is displayed in color as a whole by rotating the screen around and selectively displaying any one of the six surfaces on the front side.

[0003]

However, according to the large-sized display device described above, since each display element is a cube, the maximum displayable color is only 6 colors.
In order to be able to selectively display all six surfaces, a drive mechanism having a complicated mechanical structure is required. If a simple drive mechanism that rotates each display element only about the horizontal axis or about the vertical axis is adopted, there is a problem that the displayable colors are limited to four colors. It was difficult to express in fine color. Further, since it is difficult to make each display element itself emit light, it is necessary to illuminate the screen at night, but since it is not possible to illuminate from the front and illuminate diagonally, there is a difference in illuminance. The image might be blurred.

The present invention has been made under the circumstances described above, and its technical problem is that it can be driven by a simple mechanical structure and image information can be expressed in a large number of colors. To do so.

[0005]

The above-mentioned technical problems are as follows.
The present invention can effectively solve the problem. That is, the public large-scale display device according to the present invention includes a large number of endless belts, each of which is exposed on the screen and has pixels arranged in a matrix, and each of which is disposed inside each endless belt and rotates in parallel with the screen. A step motor for moving each of the endless belts forward and backward having an axis, and a large number of display surfaces having different colors with respect to the moving direction of the endless belt are partitioned with a width equal to or larger than the width exposed on the screen. It is colored. In a preferred embodiment of the present invention, the endless belt is made of a semitransparent film, and a backlight unit is arranged inside the endless belt.

[0006]

According to the above construction, each endless belt as a display element is moved by an integral multiple of the division width of the display surface by the step motor, or the stopped state is maintained. As a result, a single display surface among the display surfaces sectioned and colored on each endless belt is selectively exposed and displayed at each coordinate of the screen, and the exposed display surface is used as a pixel to display a character pattern or a character on the screen. Various types of image information such as figures are displayed in multicolor. At night or in cloudy weather, the backlight means is turned on to prevent the image from being blurred. Hereinafter, a preferred embodiment of a large-sized public display device according to the present invention will be described with reference to FIGS. 1 and 2.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In FIG. 1, reference numeral 1 is a screen, and 2 is a large number of pixels 2a which are partially exposed on the screen 1 and whose exposed portions are arranged in a matrix in the X column direction and the Y row direction. The endless belts 3 are step motors which are respectively arranged inside the endless belts 2 and have a rotation axis parallel to the screen 1 to move the endless belts 2 forward and backward.
The endless belt 2 is wound between a pair of rollers 4 extending in the Y-row direction along the screen 1 and a roller 3a driven by the step motor 3, and stretched between the rollers 4 and 4. The surface of the part is displayed on the screen 1.

The endless belt 2 is made of a semitransparent film,
Step motor 3 moving direction to the exposed width W ₁ which is equal to or more than the one by the width W ₂ to the screen 1 by a different number of display surface 21a of colors, 21b, 21c, · · · are partitioned colored. Further, in the space S surrounded by the endless belts 2 arranged in the Y row direction and continuously extending in the Y row direction, one or a plurality of backlight means 5 such as white fluorescent tubes are arranged. Each step motor 3, roller 4, and backlight means 5 are fixed by a support means (not shown) extending in the space S.

The step motors 3 are driven or stopped independently of each other by the image signals designated for each of them, whereby the endless belt 2 is driven by the driving roller 3a and the rollers 4, 4.
4 is moved by a distance that is an integral multiple of the partition width W ₂ of the display surfaces 21a, 21b, 21c, ...
One of c, ... Is selectively displayed on the screen 1. That is, each of these endless belts 2 exposes one of the display surfaces 21a, 21b, 21c, ... To the screen 1, so that various kinds of image information such as character patterns and graphics are multicolored in a mosaic pattern. Expressed. In the example shown in FIG. 2, among a large number of pixels 2a arranged in a matrix,
For example, the shaded coordinates (X _n , Y _n ) (X _{n + 1} , Y _n ) (X _{n + 2} ,
Pixels in (Y _n ) ・ ・ ・ (X _n , Y _{n + 4} ) have a blue display surface, and surrounding pixels have a white display surface, thereby expressing the blue character “F” on a white background. It is a thing.

According to the above embodiment, since the drive mechanism of the screen 1 is composed of the step motor 3 having the rotating shafts in the same direction, the mechanical structure is simple, and the display surfaces 21a, 21b may be different depending on the length of the endless belt 2. , 21c, ... Can be color-coded into dozens of sections, so that the image information can be expressed in delicate and rich color tones. Also, by turning on the internal backlight means 5, the screen shines brightly, and an image can be clearly expressed even under dark conditions such as nighttime or cloudy weather. In this case, the roller 4 may be replaced by a structure in which the back surface of the endless belt 2 is supported by the surface of the backlight means 5 itself as shown in FIG. 3, so that the screen 1 is not shaded by the roller 4. can do.

The present invention is not limited to the illustrated embodiment. For example, the step motor 3 may be configured to drive the roller 3a via a belt pulley or the like.

[0012]

As is apparent from the above description, according to the present invention, the display element forming the pixel is composed of an endless belt driven by a step motor, and the mechanical structure of the drive mechanism is simple. It is also easy to repair, etc., the amount of information that can be expressed can be increased by a large number of colors, and under conditions such as nighttime or cloudy weather, the image can be brightened by turning on the backlight means, It has an excellent effect that no lighting is required.

[Brief description of drawings]

FIG. 1 is a partially and partially cutaway schematic perspective view showing an embodiment of a large-sized public display device according to the present invention.

FIG. 2 is an explanatory diagram showing an example of representation of image information according to the embodiment.

FIG. 3 is a partial perspective view showing another embodiment of a large-sized public display device according to the present invention.

[Explanation of symbols]

 1 Screen 2 Endless Belt 2a Pixels 21a, 21b, 21c, ... Display Surface 3 Step Motor 5 Backlight Means

Claims (2)

[Claims] 1. A plurality of endless belts, each of which is exposed on a screen and which form pixels arranged in a matrix, and endless belts, each of which is disposed inside each of the endless belts and has a rotation axis parallel to the screen. A step motor for moving the belt forward and backward, wherein a large number of display surfaces having different colors with respect to the moving direction of the endless belt are sectioned and colored with a width equal to or larger than the width exposed on the screen. Large display device for public use. 2. The large-sized public display device according to claim 1, wherein the endless belt is made of a semitransparent film, and a backlight unit is arranged inside the endless belt.