JPH0648546Y2 - Display device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to a display device, and in particular, has an ultraviolet light source and a light emitting member that emits high-luminance visible light by the ultraviolet light emitted from the ultraviolet light source. The present invention relates to a display device that displays with this visible light.

[Prior Art] Conventionally, a display device for displaying characters, figures and the like using transmitted light has been used for various purposes such as an advertising board and a guide board.

FIG. 10 is a schematic view showing an example of a conventional display device.

In FIG. 10, 8 is a light source such as a fluorescent lamp, and 6 is a display plate on one side of which characters, figures, etc. are drawn with paint, ink, colored film or the like, and a plastic plate, a glass plate or the like is used. , Those that are colored as needed are used. Reference numeral 7 is a case for fixing the display plate 6 and the light source 8.

[Problems to be solved by the invention]

As described above, in the conventional display device, the light source is arranged on the back surface of the display plate and the visible light emitted from the light source displays characters, figures and the like drawn on the display plate. Since it is limited depending on the emission wavelength and emission intensity of the light source, it is impossible to select an arbitrary color, and there are problems such as low brightness. Further, in order to make the brightness of the light emitted from the light source uniform, it is necessary to use a scattering plate or the like for the display plate. However, even if the scattering plate is used, the light source needs to have a large thickness in order to prevent the light source from being invisible, and there is also a problem that the brightness of transmitted light is reduced.

[Means for solving problems]

The above-mentioned problem is that a plurality of light-emitting members containing at least one light-emitting material-containing paint coating layer that emits light by ultraviolet light are provided on a light-transmitting support, and a plurality of light-emitting members are provided to emit light with different light-emitting colors Means and an ultraviolet light source provided on the back surface of the light emitting means, wherein display is performed by visible light emitted from the surface of the light emitting means.

[Action]

The present invention comprises an ultraviolet light source and a plurality of light emitting members (light emitting means) having at least one coating film formed by coating a light transmissive support with a coating in which a fluorescent substance that emits ultraviolet light is dispersed in a vehicle. By being provided, the phosphor particles are caused to emit light by the ultraviolet light emitted from the ultraviolet light source. In the present invention, each light emitting member is freely replaceable, and the light emitted from each light emitting layer is combined to
It is possible to select any emission color.

〔Example〕

 Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a schematic sectional view of an embodiment of the display device of the present invention.

In the invention of the present application, a plurality of light emitting members are stacked to form a light emitting means. However, in FIG. 1, only one light emitting member is included in the light emitting means for simplification of description.

FIG. 2 is a partial cross-sectional view of the light emitting member used in the above embodiment.

In FIG. 1, 3 is an ultraviolet light source, and 1 is a light emitting member. As shown in FIG. 2, the light emitting member 1 comprises a support 1b made of a transparent material such as a plastic plate or a glass plate (which is colored transparent if necessary), and a light emitting layer 1a described later. The colored layer 4 is provided on the light emitting member 1. Light emitted from the ultraviolet light source 3 is converted into high-luminance visible light in the light emitting layer 1a, passes through the support 1b, and part of the light passes through the colored layer 4 patterned into a predetermined shape. The color of the light passing through the colored layer 4 (the color obtained by multiplying the color of the colored layer 4 and the fluorescent light emission color) and the color of the light emitted from the portion of the support 1b where the colored layer 4 does not exist (of the support 1b A predetermined display is made by a color and / or a contrasting color with a fluorescent color of the fluorescent body.
May be an opaque layer that does not transmit light. Reference numeral 2 is a case for fixing the light emitting member 1 and the light source 3.

As the colored layer 4 provided on the light emitting member 1, a method of applying or printing an enamel paint or ink or a method of laminating colored sheet-like materials having a predetermined shape is suitable in the present invention, but other known methods are known. The colored layer in which the transmissive electrochromic display body, the transmissive fluorescent display body, the transmissive electrophoretic display body, etc. are mounted on the support 1b may be used.

In the light emitting member 1, if the support 1b is a film such as a PET (polyethylene terephthalate) film,
It is possible to have flexibility. Further, as shown in FIG. 3, if a transparent layer 1c such as a PET film is provided on the surface of the light emitting layer 1a, reliability such as durability can be improved. In this case, it goes without saying that the light emitting layer 1a may be provided on the transparent layer 1c, and this laminated body may be laminated on the support 1b.

Next, the light emitting layer 1a will be described.

The light emitting layer 1a has a coating film of about 50 to 200 μm formed by applying a coating material in which a fluorescent substance is dispersed in a vehicle (here, a varnish is used) onto the support 1b. In the case of FIG. 3, the above coating material may be applied to the transparent layer 1c. The fluorescent substance is contained in an amount of 5 to 80% by weight in the solid component of the coating material.

“Fluorescent substance that emits ultraviolet light” used in the present invention
It means that any fluorescent substance that emits light in the ultraviolet region can be used, but preferably it is a reflection color (body color) of itself under a visible light source.
Is white and emits light by ultraviolet rays having a wavelength of 254 to 400 nm.

The emission color of the fluorescent substance can be arbitrarily set, and for example, R fluorescent substance (red emitting fluorescent substance), G fluorescent substance (green emitting fluorescent substance) or B fluorescent substance (blue emitting fluorescent substance). It is also possible to use the three primary colors of R phosphor, G phosphor and B phosphor in arbitrary proportions as a single color for each body).

Examples of the R phosphor include Y ₂ O ₃ : Eu (emission peak 611
nm: same as below), YVO ₄ : Eu (619), Y ₂ O ₂ S: Eu (626), 3.5
MgO, 0.5MgF ₂ GeO ₂ : Mn (660), (Y, Gd) BO ₃ : Eu (611) and the like. These are used as one kind or as a mixture of two or more kinds.

Examples of the G phosphor include ZnS: Cu, Al (530), (Z
n, Cd) S: Cu, Al (530 to 560), ZnS: Cu, Au, Al (535), Zn ₂
SiO ₄ : Mn (525), ZnS: Ag, Cu (527), (Zn, Cd) S: Cu (52
5), ZnS: Cu (530), Gd ₂ O ₂ S: Tb (544), La ₂ O ₂ S: Tb (54
4), Y ₂ SiO ₅ : Ce, Tb (544), Zn ₂ GeO ₄ : Mn (533), CeMgA
l ₁₁ O ₁₉ : Tb (543), SrGa ₂ S ₄ : Eu ²⁺ (535), ZnS: Cu, CO
(516), MgO ・ nB ₂ O ₃ : Ce, Tb (544), LaOBr: Tb, Tm (54
4), La ₂ O ₂ S: Tb (544) and the like. These are used as one kind or as a mixture of two or more kinds.

Examples of the B phosphor include ZnS: Ag (450), CaWO ₄ (42
5), Y ₂ SiO ₅ : Ce (410), ZnS: Ag, Ga, Cl (450), Ca ₂ B ₅ O ₉
Cl: Eu ²⁺ (450), BaMgAl ₁₄ O ₂₃ : Eu ²⁺ (454) and the like. In addition, these are used as 1 type or a mixture of 2 or more types.

As listed above, most of the fluorescent substances suitable for use in the present invention are inorganic fluorescent substances, but other pigmented organic fluorescent substances such as invisible fluorescent substances and fluorescent brightening agents can also be used. Is.

The fluorescent substance that emits ultraviolet rays used in the present invention has a particle size of 2 to 30 μm, preferably 3 to 15 μm.
The fluorescent substance can be appropriately selected and used according to the application or environmental conditions (humidity).

The varnish may be a general varnish used for paints such as heat-curing type and room-temperature curing type.

FIG. 4 is an explanatory view showing the effect of the light emitting layer 1a.

As shown in FIG. 4, the ultraviolet light L applied to the light emitting layer 1a is absorbed by the phosphor particles and emits possible La. Since each of the phosphor particles serves as a light emitter, a surface light emitter having excellent scattering properties is formed as a whole, and as a result, it is possible to provide a display device that is uniform and has high brightness and no unevenness. Further, even if the distance between the light source and the light emitting member is shortened, a uniform surface light-emitting body can be obtained. Therefore, the distance can be shortened, which has an advantage that it can be designed compactly.

When using two or more fluorescent substances, in addition to the method of mixing various fluorescent substances as described above, a method of laminating a plurality of light emitting layers 1a having different emission colors on a support emits light on both sides of a transparent support. Although there is a method of forming the light emitting layers 1a having different colors, the present invention particularly stacks a plurality of light emitting members having different light emitting colors,
It has a desired hue.

FIG. 5 is an explanatory view showing the effect of stacking two light emitting members.

In FIG. 5, 10 and 11 are light emitting members, respectively.
Reference numerals b and 11b are supports, and 10a and 11a are light emitting layers.

The ultraviolet light L with which the light emitting layer 10a is irradiated is partially absorbed by the phosphor particles and emits visible light La. Most of the ultraviolet light L that is not absorbed in the light emitting layer 10a is transmitted ultraviolet L '. That is, the light emitting layer 11a is irradiated with the visible light La and the transmitted ultraviolet light L '. Similar to the light emitting layer 10a, visible light Lb is emitted from the light emitting layer 11a by the transmitted ultraviolet light L '. Most of the visible light La and a part of the transmitted ultraviolet light L'are transmitted and become visible light La 'and Lb, and a part thereof becomes the transmitted ultraviolet light L ".

In this embodiment, the visible light La 'and Lb which are uniform and have no uneven brightness are obtained by the ultraviolet light L and the transmitted ultraviolet light L'.
In addition, an arbitrary color can be selected by combining two light emitting members. It is of course possible to combine three or more light emitting members.

The method of stacking the above light emitting members is a method of forming a light emitting layer by mixing a plurality of types of phosphors having different emission colors and a method of stacking a plurality of light emitting layers having different emission colors, the mixing ratio of the combination of the phosphors. However, it is difficult to adjust the film thickness and the like, and it is necessary to conduct many experiments to obtain a desired color. On the contrary, since each light emitting member can be replaced, the color can be easily selected.

In the method of stacking the above-mentioned light emitting members and the method of laminating a plurality of light emitting layers, since the lower light emitting layer absorbs ultraviolet light and converts it into visible light, ultraviolet light transmitted to the upper light emitting layer is adjusted by the lower light emitting layer, Further, since the upper light emitting layer blocks a part of visible light emitted from the lower light emitting layer, the order of superposition can be changed to control the light amount from each light emitting layer, and the color can be changed by the combination. .

The display device of the present invention can be used not only for the display device shown in FIG. 1 which performs a two-dimensional display but also for the display device which performs a three-dimensional display.

FIG. 6 is a schematic vertical sectional view of another embodiment of the display device of the present invention.

FIG. 7 is a schematic perspective view of the display device.

The same members as those of the display device shown in FIG. 1 are designated by the same reference numerals and the description thereof will be omitted. Further, in FIG. 7, the coloring layer is omitted for simplification.

6 and 7, the light emitting member 1 is provided on six sides, and 5 is a structural material that supports each light emitting member 1.
The ultraviolet light source 3 is arranged inside the structural material 5.

Further, in the present invention, it is appropriate to perform a predetermined display by comparing the color of the light passing through the colored layer 4 with the color of the light emitted by the emission of the fluorescent substance in the portion where the colored layer 4 is not present as described above. However, without providing the colored layer 4, it is also possible to separately apply phosphor-containing paints of different emission colors on the support and perform a predetermined display by the contrasting color of the emission colors. For example, a display device in which an uneven support 1b as shown in FIG. 8 is used, and a coating film containing a fluorescent substance-containing phosphor of different emission colors is applied to the convex portion and the concave portion,
The present invention is also possible in the present invention in which the cylindrical support 1b as shown in the figure is used, and the side portions are separately coated with phosphor-containing paints of different emission colors in strips.

Hereinafter, an experimental example of the light emitting layer 1a described above will be described.

A transparent 75 μm PET film is used as the support 1b,
This film is coated with a coating material in which a fluorescent substance is dispersed in a varnish to a thickness of about 100 μm to form a light emitting member, which is installed in the display device shown in FIG. 1 and examined for a combination of light emitting colors. went. The distance between the ultraviolet light source (a black light lamp that emits ultraviolet rays having a wavelength of 300 to 400 nm) and the light emitting member was set to 30 mm, and the fluorescent material used in this example had a red fluorescent material of Y ₂ O ₂ S: Eu, the green phosphor is Zn ₂ GeO ₄ : Mn, and the blue phosphor is Ca ₂ B ₅ O ₉ Cl: Eu ²⁺ .

Table 1 shows the color of light emitted by the light emitting member of this example.

In Table ₁ , 1 ₁ , 1 ₂ and 1 ₃ indicate the emission colors of the phosphors of the respective light-emitting members that are stacked from the observer side, and BR and GB are the blue phosphor and the red color, respectively, on the film. The case where the fluorescent substance is mixed and applied at a ratio of 1: 1 and the green fluorescent substance and the blue fluorescent substance are mixed and applied at a ratio of 1: 1 are shown.

[Effects of the Invention] As described in detail above, according to the display device of the present invention, since various fluorescent substances can be combined, the emission color can be arbitrarily selected, and the emission light from the ultraviolet light source can be selected. The individual fluorescent bodies emit light by the generated ultraviolet light to form a high-luminance surface light-emitting body as a whole, so that it is possible to provide a display device which is uniform and has no luminance unevenness.

Further, since the fluorescent body of each light emitting member can be arbitrarily changed, the light emitting color can be easily changed. Furthermore, the distance between the light source and the light emitting member can be shortened, and the device can be made compact.

[Brief description of drawings]

FIG. 1 is a schematic vertical sectional view of an embodiment of the display device of the present invention. FIG. 2 is a partial cross-sectional view of the light emitting member used in the above embodiment. FIG. 3 is a partial cross-sectional view showing another example of the light emitting member. FIG. 4 is an explanatory diagram showing the effect of the light emitting layer. FIG. 5 is an explanatory view showing the effect of stacking two light emitting members. FIG. 6, FIG. 8 and FIG. 9 are schematic vertical sectional views of another embodiment of the display device of the present invention. FIG. 7 is a schematic perspective view of the display device shown in FIG. FIG. 10 is a schematic view showing an example of a conventional display device. 1,10,11 ... Light emitting member, 1a, 10a, 11a ... Light emitting layer, 1b, 10b, 11b
... Support, 1c ... Transparent layer, 2 ... Case, 3 ... Ultraviolet light source, 4
... Colored layer, 5 ... Structural material.

Claims (1)

[Scope of utility model registration request] 1. Light emission in which a plurality of light-emitting members, each having at least one fluorescent-material-containing paint coating layer that emits light by ultraviolet light, is provided on a light-transmissive support, and the emission color of each light-emitting member is changed. And a UV light source provided on the back surface of the light emitting means, wherein display is performed by visible light emitted from the surface of the light emitting means.