JPH01293388A - Display device - Google Patents

Abstract

PURPOSE:To accomplish a display device which exhibits excellent display property and a high brightness in dry and night by placing a paint layer containing daytime fluorescent pigment on the surface of the light transmission supporting body of a display base and placing a glass hollow and a paint layer containing a fluorescent whitening pigment thereon. CONSTITUTION:The glass hollow 4 and the paint layer 1b containing the daylight fluorescent pigment particle 6 generating light by light emitted from a light source 3 are placed on the surface of the light transmission supporting body 1a of the display base 1, and thereon the glass hollow 4and the paint layer containing the fluorescent whitening pigment 5 are placed. Under daylight or illumination similar to the daylight, the daylight fluorescent pigment generates light with the aid of ultraviolet rays accounting for much of the daylight, violet rays in a visible short band and patina rays, and an image is displayed. Unless the display plane is irradiated with the daylight, light is emitted from the light source 13 to scatter incident light from the light source 3, light emitted from the fluorescent whitening pigment 5 and light emitted from the daylight fluorescent pigment particle 6. Thus, the display device is attainable which exhibits a high brightness in day and night and provides a sharp image.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a display device, and particularly to a display device that includes a light source and a display device that is arranged at a certain distance from the light source and that displays transmitted light emitted from the light source. The present invention relates to a display device having a display substrate used for.

[Conventional technology]

2. Description of the Related Art Display devices that display characters and graphics using transmitted light have been used for various purposes such as advertising boards and information boards.

FIG. 6 is a schematic diagram showing an example of a conventional display device.

In Fig. 6, 3 is a light source such as a warning light, and 7 is a display board with letters, figures, etc. drawn on one side with paint or ink.
A glass plate, a glass plate, or the like is used, and the case 2 is a case in which the display plate 7 and the light source 3 are fixed.

This display device performs display during the day by using the difference between the 70 colors on the display board and the colors of paint, ink, etc. applied on it.
At night, the transmitted light emitted from Light 1: #3 is used to display the display in a contrasting color between the color of the display board and the color of the difference in transmitted light from the paint, ink, etc. applied on it. conduct.

[Problem that the invention seeks to solve]

In the above-mentioned conventional display devices, the brightness of the light emitted from the light source is uniform, and in order to scatter the light, a scattering plate is used on the display board, or a W finish is applied to the surface of the display board. There is a need for the following. However, simply machining the surface of the display board is not enough to scatter light, and in order to achieve uniform brightness, a large distance must be maintained between the display board and the light source, making it difficult to make the display device thinner. So, the problem is that the brightness of the transmitted light decreases. Even when using a scattering plate, it is necessary to increase the thickness of the scattering plate in order to prevent the light source from being seen through, which also reduces the brightness of the transmitted light. That's a problem, my friend.

SUMMARY OF THE INVENTION In view of the above conventional problems, it is an object of the present invention to provide a ratio display device with completely improved scattering properties, and to provide a display device with excellent display performance both day and night and high brightness.

[Means for solving problems]

The display device of the present invention has a light source and a constant distance from the light source. : A display device having display substrates arranged apart from each other and using transmitted light emitted from the light source for display, wherein the display substrate includes a light-transmitting support and a surface of the light-transmitting support. A paint coating containing a glass hollow body provided thereon and a daylight fluorescent pigment that emits light by light emitted from a light source; and a paint film containing.

[Effect]

In the present invention, the display substrate is a light-transmitting support.

A paint film containing a glass hollow body and a daylight fluorescent pigment that emits light by light emitted from a light source, provided on the surface of this light-transmitting support, and a paint film created on this paint film. ,
It is composed of a hollow glass body, a fluorescent brightening pigment, and a paint film that contains all of the components, and under daylight or lighting similar to daylight, it can emit light from the ultraviolet, which is a large part of daylight, to the visible. Violet in the short wavelength range,
Displays are made by causing daylight fluorescent pigments to emit light using blue, blue-green, etc. By emitting light sound, first, a coating film formed by coating a glass hollow body with a paint in which a fluorescent whitening pigment is dispersed in a vehicle is irradiated by the fluorescent whitening pigment particles, and the subsequent light is scattered over a wide angle. At the same time, these fluorescent whitening pigment particles emit light and scatter the light, and the glass hollow body with excellent scattering properties
The incident light from the light source and the light emitted from the fluorescent whitening pigment are scattered, and then the glass hollow body and the daylight fluorescent pigment are dispersed in a vehicle to scatter the light that passes through the coating. The coating is applied to form a coating film, and the daylight fluorescent pigment particles cause scattering over a wider angle, and at the same time, these daylight fluorescent pigment particles emit light, scattering light, and further scattering properties. The advantage of this is that the glass hollow body scatters the light from the coating containing the fluorescent whitening pigment particles and the light emitted from the daylight fluorescent pigment particles.

〔Example〕

Embodiments of the present invention will be described in detail below with reference to the drawings.

FIG. 1B is a schematic cross-sectional view showing one embodiment of the display device of the present invention, and FIG. 1(B) t'! It is a schematic perspective view. Note that in the MI diagram (B), the display substrate is omitted for simplification.

FIG. 2(4) is a partially enlarged view for explaining the structure of the display base, and FIG. 2(ω) is an enlarged view of the X section in FIG. 2(4).

FIG. 3 is a ninth partially enlarged view illustrating another example of the structure of the display base.

In FIG. 1(4)(B), 3 is a light source such as a fluorescent lamp, and 1 is a display substrate. 2 is a display substrate 1 and a light source 31
- This is a fixed case. As shown in FIG. 2 (4) ■), the display substrate 1 is a light-transmitting support 1a made of a light-transmitting material such as a plastic plate or a glass plate (transparently colored if necessary, and the following materials may be used). (A scattering plate may also be used to improve the scattering effect.); a paint coating 1b containing a glass hollow body and a daylight fluorescent pigment that emits light due to the light emitted from the light source; The paint film IC is formed on the paint film lb and includes a paint film IC containing a glass hollow body and a fluorescent whitening pigment, and a colored layer 1d.

Under daylight, or under lighting similar to daylight, the light ranges from ultraviolet, which is the large part of daylight, to violet, which is the visible short wavelength range,
A predetermined display is made by the luminescent color of the daylight fluorescent pigment of the paint coating film 1b that emits light with blue, blue-green, etc. light and the contrasting color of the colored layer 1d.

When the display surface is not irradiated with daylight, light is emitted from the light source 3 provided at a certain distance in the opposite direction to the display surface. The light emitted from the light source 3 is scattered at the paint coating 1c, converted into light with a longer wavelength, and further scattered or converted into light of a predetermined wavelength at the paint coating 1b.
The light passes through 1 m of the light-transmitting support, and a portion of it passes through a colored layer patterned into a predetermined shape. This colored layer 1d
The color of the light passing through i (the color of the colored layer 1d) and the light-transmitting support 1
A predetermined display is made by a color that contrasts with the color of the light emitted from the part of b where the colored layer 1d is absent (the color of the transparent support 1a and the luminescent color of the daylight fluorescent pigment). Ru. Note that the colored layer 1d may be an opaque layer that does not transmit light.

In the display substrate 1, the light-transmitting support 1a'6pm
(Polyethylene terephthalate) film or the like can be used to provide flexibility. 9. As shown in Figure 3, P is applied on the paint coating IC.
Transparent layer 1ef such as ET film or clear coating film: If provided, reliability such as durability can be improved. In this case, paint film 1c and paint film 1 are placed on one transparent layer.
Of course, it is also possible to provide a layer b and laminate this laminate on one side of the light-transmitting support.

Next, the above-mentioned paint coating IC will be explained.

The paint film IC is formed by dispersing the fluorescent whitening pigment 5 and the glass hollow body 4 in a vehicle (here, a fest is used) and then applying the paint to the support to form a paint film of about 70 to 150 μm. be done. In the case of Figure 3, transparent layer 1.
The paint may be applied to. In the solid component of the paint, the fluorescent whitening pigment is contained in an amount of 20 to 40% by weight, and the glass hollow body is contained in an amount of 1% by weight.
Contain up to 40% by weight. Fluorescent whitening pigments include stilbene type, diaminodiphenyl type, imidazole, imidasilone, triazole type, thiazole, oxazole type,
Coumarin, Cal? Fluorescent whitening dyes such as steryl type and naphthalimide type are dissolved in synthetic resins such as acrylic resin, vinyl chloride resin, alkyd resin, area resin, melamine resin, and benzoguanamine resin to form a solid solution with particle size 2.
It is a powder of about ~20 μm, and the fluorescent whitening dye is contained in an amount of 0.1 to 10% by weight based on the total weight.

Types of the fluorescent whitening pigment particles: 9 particle sizes: 1 weight ratio.

The thickness of the paint film 1c is determined by conditions such as the brightness of the light source, the emission wavelength, the arrangement, and the distance between the light source and the display substrate.

The glass hollow body 4 has an average particle diameter of 20 to 50 μm and a wall thickness of several μm.
For example, commercially available products such as 6 Scotchirite "Grass Papples 860/10000" are used.
(Sumitomo 3M Co., Ltd.) can be used.

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

FIG. 4 is an explanatory diagram showing the effect of the fluorescent whitening pigment.

FIG. 5 is an explanatory diagram showing the effect of the glass hollow body.

As shown in FIG. 4, part of the visible light and ultraviolet light irradiated onto the paint coating IC is absorbed by the fluorescent whitening pigment particles 5, and light with a longer wavelength than the absorbed light is produced. b t-
Most of the emitted and unabsorbed light is scattered by the fluorescent whitening pigment particles and becomes scattered light Lm. That is, in the present invention, in addition to scattering light, each fluorescent whitening pigment particle 5 emits light and becomes a surface light emitter, making it possible to improve scattering efficiency. Also, as shown in Figure 5,
When light enters the hollow glass body 4, it is reflected by the outer and inner circumferential surfaces of the hollow glass body 4, and the reflected light (indicated by broken lines in the figure) is scattered in various directions. Note that the above-mentioned scattered light Lm and light Lb
is similarly scattered by the glass hollow body 4.

In this way, the present invention allows incident light to be efficiently scattered.
Since the fluorescent whitening pigment particles can emit light and be used as a surface emitter, it is possible to reduce the thickness of the display substrate and provide a uniform and high-brightness display. Furthermore, by reducing the distance between the display substrate and the light source, it is also possible to design the entire display device to be thinner and more compact.

The thickness of the paint film 1-e is preferably in the range of 70 to 150 μm. This is because when the diameter is less than 70 μm, the proportion of light emitted from the light source 3 transmits through the paint coating IC increases, and the scattering effect decreases; when it exceeds 150 μm, the light 111
The light emitted from 3 is irradiated only to the lower layer of the paint coating IC, the light emitted by the fluorescent whitening pigment 5 and the subsequent light is blocked by the upper layer, and the light emitted from the fluorescent whitening pigment 5 and the glass hollow body 4 This is because the scattered light is also attenuated.

Further, the average grain size of the glass hollow body 4 is preferably in the range of 20 to 50 μm. This is the thickness of the paint coating IC from 70 to 150.
Considering the scattering efficiency for μm, it is 20 μm.
If it is less than 5 oltrn, the light intensity is attenuated due to repeated reflections of the light by the glass hollow body 4, and if it exceeds 5 oltrn, most of the light passes through the glass hollow body 4 and is not scattered, causing the paint coating on the IC.
This is because t-transmission occurs.

Moreover, the glass hollow body 4 weighs 1
The content of the fluorescent whitening pigment 5 is preferably 20 to 40% by weight. This is a good choice considering the performance balance between the hollow glass body 4 having excellent light scattering properties and the fluorescent whitening pigment 5 as a surface light emitter and the strength of the coating film.

In addition, if part of the glass hollow body 4 is entirely glass fine powder,
It is possible to further improve the scattering effect and display colors (white) more vividly. Note that the amount of fine glass powder is preferably up to 10% by weight based on the weight of the paint coating IC, and if it exceeds 10% by weight, the light intensity will be greatly attenuated due to repeated reflection of light.

Next, the paint film 1b will be explained.

The paint film 1b is formed by applying a paint in which the daylight fluorescent pigment 6 and the glass hollow body 4 are dispersed in a vehicle (here, a festival is used) to form a film with a thickness of about 50 to 200 μm. The light fluorescent pigment is 5 to 60% in the solid component of the paint.
The content of the glass hollow body is 1 to 20% by weight, preferably 5 to 10% by weight.

Note that daylight fluorescent pigments exhibit their own reflected color (
It is a pigment that has a colored body color, and when excited by daylight or light similar to daylight and emits fluorescence, it exhibits an extremely glittering color that is added to the reflected color.

Specifically, Rhodamine Be Rhodami
ne 6G.

Rhodarnina Be Eo@ine, Ba
5ic yellow HG*Br1l11antsu
lfoflavin@FF, Th1oflavin@
.

Fluorescent dye such as Fluorese・in is applied to acrylic resin,
It is dissolved in a synthetic resin such as vinyl chloride resin, alkyd resin, urea resin, melamine resin, benzoguanamine resin to form a solid solution, and then the particle size is 1 to 15 μm, preferably 2 to 1 O
It is a powder of μm, and the fluorescent dye is 0.1 to 0.1 μm based on the total weight.
10% by weight.

The effect of the daylight fluorescent pigment is different from the effect of the fluorescent whitening pigment mentioned above, and a part of the next light passes through the paint coating IC,
Daylight fluorescent pigment particles 6 (shown in Figure 2 CB) are absorbed by K;
It emits light with a longer wavelength than the absorbed light, and most of the unabsorbed light is scattered by the daylight fluorescent pigment particles and becomes scattered light. In other words, not only the scattered light but also the individual daylight fluorescent pigment particles emit light and become surface emitters, and in addition to the scattering effect of the paint coating IC described above, the scattering efficiency can be further improved, so that the display is more visible. By reducing the thickness of the substrate, it is possible to emit uniform and high-intensity light, and by further reducing the distance between the display substrate and the light source, it is also possible to make the display device thinner and to design it as a conductor. It is.

Further, the daylight fluorescent pigment can be arbitrarily selected depending on the purpose, and a single type of daylight fluorescent pigment or a mixture of daylight fluorescent pigments emitting different colors in an arbitrary ratio can be used. Note that a plurality of paint coating layers 1b containing daylight fluorescent pigments of different luminescent colors may be laminated on the light-transmitting support 1a.

Regarding the effect of the glass hollow body 4, the above-mentioned paint coating film 1c
Since it is the same as the glass hollow body used for, the explanation will be omitted.

In the present invention, a normal white or daylight colored fluorescent lamp can be used as the light@3, but some types of daylight fluorescent pigments are not so excited by the light of a normal fluorescent lamp, and therefore A three-wavelength fluorescent lamp that contains strong excitation light for each daylight fluorescent pigment, that is, has strong emission wavelength peaks in the blue region, edge region, and red light region (and orange region) is suitable in the present invention.

Three-wavelength fluorescent lamps have a wavelength of approximately 450 nm (blue)
, 540 nm (green) and 610 nm (red)
Examples of commercially available products that combine three monochromatic lights to emit white light include ``Viewline'' (trade name manufactured by Tsubo Electric Co., Ltd.), ``Rubica Ace'' (trade name manufactured by Mitsubishi Electric Co., Ltd.), and ``Paltzuk''. (Matsushita Electric Industrial Co., Ltd. product name) 9, etc. are listed.

The three-wavelength fluorescent lamp mentioned here includes a four-wavelength fluorescent lamp that has a deep red (emission wavelength peak approximately 660 nm) light emitting component added to the three wavelengths mentioned above, and a four-wavelength fluorescent lamp that In addition to the fluorescent light, there is a blue-green color (emission wavelength peak approximately 480-49
0 nm) shall be included as a five-wavelength band emitting fluorescent lamp.

Four-wavelength fluorescent lamps, five-wavelength fluorescent lamps, and three-wavelength fluorescent lamps have different color rendering properties (or how the color of the illuminated object appears).
It was created with the purpose of improving the system.

In this embodiment, the colored layer 1d is suitably coated with enamel paint or ink or printed, but other color photographic films may also be used, and conventionally known transmission type liquid crystal display devices, transmission type It may be a colored layer placed on a fully transparent support 1a (may be separated by a certain distance) such as an electrochromic display, a transmission type fluorescent display, or a transmission type electrophoretic display. Note that it is also possible to use the display device of the present invention as a surface light emitter without providing the colored layer 1di.

〔Effect of the invention〕

As explained in detail above, according to the display device of the present invention, even if the thickness of the display substrate is reduced, a high brightness and uniform display can be provided, and the distance between the primary display substrate and the light source can be reduced. Therefore, it is possible to provide a high brightness, clear, thin and compact display device.

Further, according to the present invention, by using a paint film containing a daylight fluorescent pigment, it is possible to provide a display device with excellent display performance both day and night.

[Brief explanation of the drawing]

FIG. 1(4) is a schematic sectional view showing one embodiment of the display device of the present invention, and FIG. 1(B) is a schematic perspective view thereof. Note that in FIG. 1(B), the display substrate is omitted for the sake of simplicity. FIG. 2(A) is a partially enlarged view for explaining the structure of the display substrate, and FIG. 2(B) is an enlarged view of the X section in FIG. 2(4). FIG. 3 is a partially enlarged view for explaining another example of the structure of the display base. FIG. 4 is an explanatory diagram showing the effect of the fluorescent whitening pigment. FIG. 5 is an explanatory diagram showing the effect of the glass hollow body. FIG. 6 is a schematic diagram showing an example of a conventional display device. 1: Display substrate, 2: Case, 3: Light source, 4: Glass hollow body, 5: Fluorescent whitening pigment particles, 6: Daylight fluorescent pigment particles, 1a
: Light-transmitting support, lb, lc: Paint coating film, 1d: Colored layer, 1e: Transparent layer. Agent Patent Attorney Minoru Yamashita Figure 2 Figure 3

Claims (2)

[Claims] (1) A display device comprising a light source and a display substrate disposed at a certain distance from the light source and using transmitted light emitted from the light source for display, wherein the display substrate has a light transmitting property. a support, a paint film provided on the surface of the light-transmissive support and containing a daylight fluorescent pigment that emits light due to the light emitted from the glass hollow body and the light source; 1. A display device comprising a glass hollow body and a paint film containing a fluorescent whitening pigment. (2) The display device according to claim 1, wherein the light source is a three-wavelength fluorescent lamp.