JPH0736388A - Light diffusion preventing mask for led display - Google Patents

Abstract

PURPOSE:To give contrast without mixing the lights of respective LED display bodies by tensely providing a black interference preventing layer having many windows same as the many windows of a transparent resin plate on the surface of the transparent resin plate in accordance with each other. CONSTITUTION:A transparent resin plate such as a transparent polyethylene terephthalate plate 8 having a window 7 concentric to the LED display window 6 of a case 3 is joined together on the surface of a light diffusion layer 4' in accordance with the case 3, and the interference preventing layer 10, of a black interference preventing later having a window 9 of same size as that of the window 7 of the transparent polyethylene terephthalate plate 8, TiO black in this case (or carbon black in another case), is tensely provided in accordance with the plate. When the LED display body 2 emits a light, if a light diffused by the light diffusion layer 4' enters the transparent polyethylene terephthalate plate 8, the lights are individually radiated from the respective windows 9 of the interference preventing layer 10, the lights from the respective windows 9 are not mixed, and hence contrast is given.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a light diffusion prevention mask for LED (light emitting diode) display.

[0002]

2. Description of the Related Art As shown in FIG. 2, a conventional light diffusion prevention mask for LED display has a black color on the surface of a light diffusion plate 4 provided on the front side of a case 3 of an LED display body 2 on a printed circuit board 1. The transparent resin layer 5 is stretched. (For example, as a prior art document, there is JP-A-63-202794).

By the way, this light diffusion prevention mask for LED display preferably looks black when the LED display body 2 does not emit light, but when it emits light, the light diffused by the light diffusion plate 4 causes the black transparent resin layer 5 to pass through. Since the light passes through, it mixes with the light traveling straight through the LED display windows 6 of the case 3 and loses the contrast.

[0004]

Therefore, the present invention is based on LE
When the D display emits light, the light diffused by the light diffusing layer does not pass through when entering the transparent resin plate, but does not pass through the LED display window. The present invention is intended to provide a light diffusion preventing mask for LED display, which is provided with.

[0005]

A light diffusion preventing mask for LED display of the present invention for solving the above problems is provided on a surface of a light diffusion layer provided on a front surface side of a case of an LED display body.
A transparent resin plate provided with a large number of windows concentric with the large number of LED display windows of the case is joined and joined to the case, and a large number of windows having the same size as the large windows of the transparent resin plate are attached to the surface of the transparent resin plate. A black interference prevention layer provided with a window is stretched together.

[0006]

According to the light diffusion preventing mask for LED display of the present invention constructed as described above, when the LED display body emits light,
When the light diffused by the light diffusion layer enters the transparent resin plate, a black interference prevention layer is provided on the surface, so it goes out to the window of the transparent resin plate and goes straight through the window of the case. Therefore, the light emitted from each window as in the past is not interfered with by the light transmitted through the black transparent resin layer other than the window, and is individually radiated from each window of the black interference prevention layer, The light from each window does not mix and contrast is provided.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the light diffusion prevention mask for LED display of the present invention will be explained with reference to FIG.
Reference numeral 2 denotes an LED display body provided thereon, 3 denotes a case thereof, and a semitransparent light diffusion layer 4'having a heat insulating effect is provided on the front side of the case 3. A transparent resin plate having a window 7 concentric with the LED display window 6 of the case 3 and a transparent polyethylene terephthalate plate 8 on the main side are joined to the surface of the light diffusing layer 4'to match the case 3, and the transparent polyethylene terephthalate is formed. A black interference prevention layer having a window 9 of the same size as the window 7 of the transparent polyethylene terephthalate plate 8 on the surface of the plate 8, and in this example, an interference prevention layer 10 of TiO black (which may be carbon black) is combined. It has been stretched.

According to the light diffusion prevention mask for LED display of the embodiment thus constructed, when the LED display body 2 emits light, the light diffused by the light diffusion layer 4'enters the transparent polyethylene terephthalate plate 8. Since the TiO black interference prevention layer 10 is provided on the surface of the transparent polyethylene terephthalate plate 8, the LED display window 6 of the case 3 is exposed.
Lights traveling straight through each LE
The light emitted from the D display window 6 is no longer interfered with by the light transmitted through the black transparent resin layer 5 other than the window, and the light is emitted from each window 9 of the interference prevention layer 10 individually. The light from the light does not mix, and contrast is provided.

In the above embodiment, the window 7 of the transparent polyethylene terephthalate plate 8 has the same size as the LED display window 6 of the case 3, but it may be small if it is concentric.

[0010]

As described above, according to the light diffusion preventing mask for LED display of the present invention, when the LED display body emits light, when the light diffused by the light diffusion layer enters the transparent resin plate, it is output to the window. The light from the black interference prevention layer is individually radiated together with the light that goes straight through the LED display window of the case, so that the light of each LED display body is not mixed and a contrast is provided.

[Brief description of drawings]

FIG. 1 is a vertical sectional view showing an embodiment of a light diffusion prevention mask for LED display of the present invention.

FIG. 2 is a vertical sectional view showing a conventional light diffusion prevention mask for LED display.

[Explanation of symbols]

 1 Printed Circuit Board 2 LED Display 3 Case 4'Light Diffusing Layer 6 LED Display Window 7 Window 8 Transparent Resin Plate 9 Window 10 Black Interference Prevention Layer

Claims (1)

[Claims] 1. A transparent resin plate provided with a large number of windows concentric with a large number of LED display windows of the case is bonded to the surface of a light diffusion layer provided on the front side of the case of the LED display body so as to be aligned with the case. A light diffusion prevention mask for LED display, comprising a black interference prevention layer provided on the surface of the transparent resin plate and having a large number of windows of the same size as that of the transparent resin plate.