JP2540890Y2 - Display device - Google Patents

Description

[Detailed description of the invention]

[0001]

In this invention, a green fluorescent luminous tube is provided inside a display panel, and the lighting of the luminous tube reveals an invisible display of characters, figures, etc., which had been hidden until then. The present invention relates to an expression display device.

[0002]

2. Description of the Related Art For example, display of audio equipment and electronic equipment,
From the viewpoint of design, in the interior lighting type display device used for the display of the destination floor of an elevator, the operation display of a copying machine or a facsimile, the train guidance display of a station, etc., from the viewpoint of design, the display should be as bright and clear as possible when the light source is turned on. On the other hand, when the light is turned off, it is often required that the display portion be hidden to make the display portion invisible or hardly visible.

Conventionally, as a display device for meeting such a demand, a light source is arranged inside a display plate as shown in Japanese Utility Model Laid-Open Publication No. 52-22070, for example, while the display plate is connected to a light source. A light-shielding layer forming a light-transmitting display portion facing the side, a light diffusion plate made of a milky white translucent plate arranged on the outer surface side, and a light-transmitting colored plate further arranged on the outermost side, and when lit, While the internal light from the light source is transmitted to the light-transmitting colored plate side, the light incident from the outside particularly when the light is turned off is diffused internally by the light diffusion plate to reduce the amount of light reaching the display light shielding layer. A display device has been proposed in which the display portion is reduced in appearance as a result.

Further, in the daytime, the entire display surface is made to have a black appearance, and the display portion is made white when turned on. A green fluorescent light emitting tube is used as a light source, and the outer surface of the display plate is made of black smoke. A display device is also known in which a transparent layer is formed and a white adjustment layer of a wine red color or an urban color, which is a complementary color to green, is formed behind the transparent layer (for example, Japanese Utility Model Application Laid-Open No. 63-38179). .

[0005]

However, in the case of a conventional display device using a green fluorescent light emitting tube as described above, in particular, both of the above requirements, that is, a clear display at the time of lighting. It has not been possible to fully satisfy both the demands for the manifestation of the above and the latent display at the time of turning off the light. That is, the above-mentioned conventional display device generally uses a milky-white translucent plate which is provided with light diffusion characteristics by uniformly dispersing and mixing a white pigment such as titanium oxide or barium sulfate in a transparent synthetic resin as the light diffusion plate. However, in order to ensure the latent display at the time of turning off the light, that is, to make the display less visible due to external light, the amount of dispersion of the white pigment is increased to increase the light diffusion. When it is improved, the total light transmittance is reduced, and the bright and clear visibility of the display when the light source is turned on is impaired. On the other hand, in order to improve the display characteristics, the total light transmittance of the light diffusion plate is reduced. However, when light is turned off, the external light causes the display portion to appear thin, making it difficult to achieve complete concealment and concealment of the display, thereby causing a relative dilemma.

The present invention solves such a problem and provides a display that can further satisfy both demands for realizing a clear and bright display when the light source is turned on and for ensuring a latent display when the light is turned off. It is intended to provide a device.

[0007]

SUMMARY OF THE INVENTION The present invention achieves the above object by improving the light diffusion plate by improving the light diffusion plate while keeping the total light transmittance sufficiently high. It is like that.

That is, the present invention provides a display panel in which a black-based smoke transparent layer is arranged in a laminated or overlapping order from the outer surface side, and a wine red or amber white adjusting layer which is complementary to green. And a light-diffusing layer, and a light-shielding layer formed except for a light-transmitting display portion for characters and the like, and a green fluorescent luminous tube is provided inside the display plate,
The light diffusion layer, using a transparent synthetic resin as a matrix,
A gist of the present invention is a display device, wherein transparent particles having a light refractive index different from that of the transparent synthetic resin are uniformly dispersed in the matrix.

The transparent particles dispersed in the light diffusion plate have a light refractive index of 0.01 to 0.2 with respect to the matrix resin.
It is most preferable to use different ones within the range.

[0010]

The light diffusing layer of the display panel is made of a transparent synthetic resin matrix in which transparent particles having different refractive indices are dispersed, so that the light diffusing layer itself has an excellent light transmittance, and therefore, has a fluorescent property. When the light-emitting tube is turned on, the light incident from the translucent display portion sufficiently reaches the black-based smoke transparent layer side on the outer surface side via the white adjustment layer, and a clear and bright display appears. On the other hand, the light-diffusing layer has excellent light-diffusing properties due to dispersion of transparent particles while maintaining excellent light transmittance as described above. Therefore, when the fluorescent tube is not lit, light incident on the display panel from the outside is largely diffused in the light diffusion layer while being reflected from the light-shielding layer having the display portion toward the outer surface, and as a result, The distinction between the light-shielding layer and the light-transmitting display portion is remarkably hard to be seen from the side of the smoke transparent layer on the outer surface, making the display invisible and latent.

[0011]

An embodiment of the present invention will be described below with reference to the drawings.

In the embodiment shown in FIG. 1, (1) is a display plate, and (2) is a green fluorescent light emitting tube as a light source disposed inside a display device case (not shown) at an inner position thereof. The display panel (1) includes a black smoke transparent layer (3) arranged in a laminated or overlapping order from the outer surface side which is a display surface, and a wine red or urban white which is a complementary color to green. It comprises an adjustment layer (4), a light diffusion layer (5), and a display light-shielding layer (6) formed except for a display section (7) for characters and the like.

The black smoke transparent layer (3) is made of a synthetic resin sheet mixed with a black coloring material and adjusted to a total light transmittance of 10 to 60%, particularly preferably about 25%. When the total light transmittance is 10% or less, the transmitted color from the fluorescent tube (2) becomes dark, which hinders the display of a clear and bright display. The appearance of the red color tone of the white adjustment layer (4) may be unfavorable in aesthetic sense.

The white adjustment layer (4) behind the black smoke transparent layer (3) changes the green emission from the fluorescent light emitting tube (2) into white transmitted light, and is applied to the smoke transparent layer (3). It represents a white display, and uses a synthetic resin sheet having a total light transmittance of about 10 to 60% toned with a red color material and a purple color material.

The light diffusion layer (5) is formed by using a transparent synthetic resin such as a vinyl chloride resin, a polycarbonate resin, and a methyl methacrylate resin as a matrix.
The light refractive index is made of a material in which transparent particles having a particle diameter of about 1 to 20 μ are uniformly dispersed and mixed, which are made of a heterogeneous material having a different refractive index from the matrix resin. Those manufactured so as to have a total light transmittance of 80% or more and a diffuse light transmittance of 70% or more are used. If the total light transmittance is less than 80%, the display by the transmitted light when the fluorescent tube (2) is turned on becomes dark, and a bright display cannot be displayed. The diffuse light transmittance is 7
If it is less than 0%, the lamp image of the fluorescent tube (2) may be seen from the smoke transparent layer (3) side when the light source is turned on. In order to make the display unit (7) brightly illuminated when the arc tube is lit and to achieve a good concealment effect of the display unit (7) when not lit, light refraction is required between the transparent particles and the matrix transparent synthetic resin. Preferably, the ratios have a difference in the range of 0.01 to 0.2. That is,
If the difference in the light refractive index is less than 0.01, the light diffusing layer (5)
, The light diffusion effect is small, and the concealing effect of the display unit (7), that is, the latent display at the time of non-lighting cannot be satisfactorily achieved. On the other hand, when the difference is 0.2 or more, the total light transmittance of the light diffusion layer (5) itself is reduced, and the above-described disadvantage is derived. Such a difference in the light refractive index is caused by, for example, as described above, a vinyl chloride resin (refractive index 1.55) and a polycarbonate resin (refractive index 1.58)
7) When using a methyl methacrylate resin (refractive index: 1.49), a transparent particle made of a cross-linked methyl methacrylate resin having a refractive index of 1.50, a cross-linked polystyrene resin having a refractive index of 1.60, or the like is used. Thus, it can be easily provided.

The light-shielding layer (6) is formed of an opaque synthetic resin sheet or an opaque ink or the like. Is formed.

In the above embodiment, when the green fluorescent light emitting tube (2) of the light source is turned on, green light from the light emitting tube is diffused from the translucent display portion (7) into the light diffusion layer (5). After being transmitted and adjusted to white by the white adjustment layer (4),
As shown in FIG. 2, characters (figure), graphics, etc. corresponding to the display (7) are displayed on the black smoke transparent layer (3) on the surface.
a) is brightly and clearly revealed. Also, when the fluorescent tube (2) is not lit, the outer surface of the display panel (1) is covered with a black smoke transparent layer (3), so that the entire surface has a substantially uniform black appearance. You. In this case, part of the external light is transmitted while diffusing through the smoke transparent layer (3), the white adjustment layer (4), and the light diffusion layer (5), and is transmitted to the light shielding layer (6) having the display section (7). However, since a small amount of light reflected therefrom is remarkably diffused in the light diffusion layer (5) and returns, the light is actually displayed from the outer side of the smoke transparent layer (3). The existence of the portion (7) becomes completely invisible. Therefore, the display is completely hidden and concealed.

[0018]

Since the present invention has the above-described configuration, the entire display surface is made to have a uniform black appearance when the fluorescent tube is not lit, and the black color is displayed when the fluorescent tube is lit. In addition to being able to show a white display with clear contrast on the surface, the light diffusion layer inside the display panel uniformly disperses transparent particles with a different light refractive index from the transparent synthetic resin matrix. Since the light is diffused, the excellent light transmittance and the light diffusion effect of the light diffusion layer allow the display to be sufficiently bright and clear when the fluorescent tube is turned on while the lamp is being displayed. When the image is not illuminated, and when the image is not illuminated, even if external light is received, the display can be completely hidden and the image can not be externally displayed. Therefore, it is possible to provide a display device having excellent display functionality and excellent appearance and design.

[Brief description of the drawings]

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

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

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Display board 2 ... Green fluorescent luminous tube 3 ... Black smoke transparent layer 4 ... White adjustment layer 5 ... Light diffusion layer 6 ... Light shielding layer 7 ... Translucent display part

Claims (2)

(57) [Scope of request for utility model registration] 1. A display panel, comprising: a black smoke transparent layer arranged in a laminated or overlapping order from the outer surface side; a wine red or amber white adjusting layer complementary to green; And a light-shielding layer formed except for a light-transmitting display portion for characters and the like, and a green fluorescent luminous tube is provided inside the display panel, and the light diffusion layer is
A display device comprising a transparent synthetic resin as a matrix, and transparent particles having a light refractive index different from that of the transparent synthetic resin are uniformly dispersed in the matrix. 2. The display device according to claim 1, wherein the transparent particles have a light refractive index different from that of the matrix resin in a range of 0.01 to 0.2.