JP2009047909A - Printed display body - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide, by using a printing technology, a printed display body capable of easily displaying desired pictures, characters, or various patterns with high luminance by efficiently making use of the light emitted from a viewer side and, further, capable of imparting three-dimensional effects and textures (depth, contrast). <P>SOLUTION: The printed display body 100 has, at least on one face of a light transmissive substrate 1, a light diffusion layer 2 formed in a pattern, and emits light by the light from an edge light source 3. The light diffusion layer 2 is formed by a printing method using a printing ink for plastics composed of 10-40 wt.% of polymer fine particles whose average particle diameter is 3-20 μm and 90-60 wt.% of a transparent binder, and its haze is ≥90% and collimated light transmittance is ≤10%. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a printed display body that emits light by converting transmitted light from an edge light source into surface light emission.

  In the illuminant that emits light by the light transmitted from the light source by the edge light, the light guided to the illuminant is a straight light, and therefore it is necessary to convert the light that goes out of the illuminant into surface emission at a right angle. Conventionally, it has been supported by sandblasting and engraving processing of engraving and printing shape of printing ink (dot printing). However, these methods cannot transmit straight light directly into surface light at a right angle and transmit lost light. Many occurred.

  In order to solve such a problem, Patent Document 1 discloses that a linear groove is formed on the surface of a plate-shaped light transmission member formed on a transparent acrylic plate, and a concave portion on one side surface of the plate-shaped light transmission member. A surface light emitter is described in which the LED lamp can be made to emit light so that light from the LED lamp can be emitted not only on the side surfaces of the plate-shaped light transmission member but also on the upper and lower surfaces in a more uniform state. .

  In Patent Document 2, a number of straight grooves are provided in parallel on the entire rear surface of the transparent light guide plate, and light is emitted from the direction perpendicular to the grooves to the side of the light guide plate. A planar light emitter in which point light emitters are arranged is described.

  Patent Document 3 discloses a planar light emitter by bonding a transparent member made of a transparent synthetic resin layer not containing a light scattering material and a translucent member made of a semitransparent synthetic resin layer containing a light scattering material. It is described that an LED array is disposed on one end surface side of the planar light emitter.

  Patent Document 4 describes a case where an LED lamp is inserted into a mounting hole provided on one end surface of a transparent plate-like acrylic member, and a reflective tape is pasted on the light emitting surface of the acrylic member. ing.

  Further, in Patent Document 5, a side light emitting portion of a rod-shaped first light guide having a point light source emitter disposed at the tip is coupled to one side end of a plate-like second light guide. A surface light-emitting device that obtains radiated light from the main surface of the second light guide is described.

  Further, in Patent Document 6, a light emitting material such as an LED lamp is fitted or closely attached or closely attached to a light emitting material such as a glass engraved with a picture or a character or formed with irregularities by molding. Luminescent materials are described.

  Further, in Patent Document 7, the light transmittance of the light emitter at an optical path length of 220 mm from the light source is 0.1% or more and 80% or less, and the luminance ratio of the light emitter that emits light by the light from the light source is A light emitting unit that satisfies the condition of 0.5 ≦ L10 / L210 ≦ 20, where L10 is the luminance of the light emitter at a position 10 mm from the light source and L210 is the luminance of the light emitter at a distance 210 mm from the light source. A light emitter is described.

  Patent Document 8 proposes a display device in which characters, patterns, and the like are screen-printed with ink containing a pearl material, glass bead pigment, or the like on the back surface of a resin light guide plate.

JP 2000-348518 A JP 2002-100226 A Japanese Patent Laid-Open No. 11-329044 Japanese Patent Application Laid-Open No. 08-076703 JP 11-191307 A JP 2000-149606 A JP 2006-179454 A JP 2004-226437 A

  However, Patent Documents 1 and 2 have a problem in that a planar light emitter cannot be obtained without a linear groove shape.

  In patent document 3, there exists a problem that a planar light-emitting body cannot be formed unless a transparent member and a semi-transparent member are joined.

  In Patent Document 4, there is a problem in that there is only one light emitting surface, and a reflective tape needs to be attached to the portions other than the light emitting surface.

  In Patent Document 5, there is a problem that a surface light emitter cannot be obtained without a first light emitter that converts a point light source into a linear light source.

  In Patent Document 6, there is a problem that a luminescent material cannot be obtained unless engraving a picture, a character, or the like or forming irregularities by molding.

  In Patent Document 7, a light scattering material is added to the light-transmitting resin to solve the problem. However, the light transmittance of the light emitter at an optical path length of 220 mm from the light source is 0.1% or more and 80% or less. The luminance ratio of the illuminant that emits light from the light source is L10 when the distance from the light source is 10 mm, and L210 when the distance from the light source is 210 mm. At this time, there is a problem that a light emitting unit that satisfies the condition of 0.5 ≦ L10 / L210 ≦ 20 is necessary.

  In Patent Document 8, the pearl material and the glass bead pigment are excellent in the property of reflecting light by themselves, but absorb a certain amount of light in the ultraviolet region and the light transmittance of the pigment itself is low. Since the light incident on the light is attenuated, there is a problem that a loss of light emitted to the viewer side occurs, resulting in a decrease in brightness and a significant decrease in the visibility of the printed surface.

  The present invention solves the above-mentioned problems, and an object of the present invention is to easily use a light emitted from an observer side to easily obtain a desired pattern, characters, and various patterns with high luminance. An object of the present invention is to provide a print display body that can be displayed and that can give a three-dimensional feeling and a texture (depth / shading) using a printing technique.

  In order to solve the above-mentioned problems, the present inventors printed ink mixed with polymer fine particles having a specific particle diameter on the front and back surfaces of a light-transmitting base material, and utilized high light transmission diffusion of the polymer fine particles. Then, by converting the light emitted from the edge light and passing through the light-transmitting base material into flat light, it has a unique pattern and character with unprecedented high brightness and three-dimensionality, texture, depth, and shade And an inexpensive printed display that can easily display various patterns.

  That is, the printed display body of the present invention is a printed display body that has a light diffusion layer formed in a pattern on at least one surface of a light-transmitting substrate, and emits light by light from an edge light source, The light diffusion layer is formed by a printing method using a printing ink for plastic composed of 10 to 40% by weight of polymer fine particles having an average particle size of 3 to 20 μm and a transparent binder of 90 to 60% by weight, and the haze is 90% or more. The parallel light transmittance is 10% or less.

  The printed display body of the present invention can be designed with high brightness and various directivities. Moreover, since it can be manufactured by a printing method, it is possible to provide a printed display body that is very easy, quick and inexpensive.

  Therefore, it is possible to employ gate lights, display objects for various events, amusements, display indicators (digital cameras, stereos, mobile phones, DVDs, etc.), room lights, car interiors, interior lights, and other various displays.

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

(1) 1st form FIG. 1: is a schematic sectional drawing which shows an example of the display apparatus using the print display body which concerns on the 1st form of this invention. As shown in FIG. 1, the printed display body 100 of the present invention has a light diffusion layer 2 formed in a pattern of characters, pictures, etc. on one surface of a light-transmitting substrate 1.

  In the display device of FIG. 1A, an edge light source 3 is attached to the printed display body 100 so that the light diffusion layer 2 is opposite to the observation surface (light emission side surface), and the light source light reflecting mirror is provided on the inner surface. It is fixed by a light source fixing base 4 having a light source (not shown) and a display case 5 having a light reflecting surface (not shown) on the inner surface.

  In the display device of FIG. 1B, the printed display body 100 is fixed so that the light diffusion layer 2 becomes an observation surface (light emission side surface). In this case, in order to smooth the unevenness of the light diffusing layer 2, a transparent film / sheet or a light-transmitting colored film / sheet may be bonded to the surface of the printed display body 100 where the light diffusing layer 2 is formed.

  In the display device of FIG. 1, the light emitted from the edge light source 3 is reflected by the straight light 6 that travels straight until reaching the light diffusion layer 2, or by the light reflecting surface of the light source fixing base 4 until it reaches the light diffusion layer 2. The reflected light 7 and the light projected on the light diffusion layer 2 become the outgoing light 8. Thereby, the observer 9 can recognize patterns formed by the light diffusion layer 2 such as characters and pictures.

  The outgoing light 8 has a brightness of outgoing light according to the amount of polymer fine particles in the light diffusion layer 2. As shown in FIG. 2 (a), when the emitted light luminance 10 is gain 1, the directivity is the same brightness when viewed from all angles when emitted as emitted light, but when viewed from the front. It is also possible to increase the brightness of the image and decrease the brightness when viewed from an oblique direction. For example, as shown in FIG. 2B, since the amount of emitted light is the same, if the gain is 2, the front luminance is twice that of the gain 1, but the luminance decreases when the angle is changed. It will be. These gain and directivity can be controlled by the amount of polymer fine particles in the light diffusion layer 2 and the film thickness of the light diffusion layer 2, but in the present invention, the light diffusion layer 2 is formed by a printing method. There is an advantage that control is very easy.

≪Light transmissive substrate≫
The light-transmitting substrate is not particularly limited as long as it has a light-transmitting property such as a resin plate or a glass plate, but a resin plate such as PMMA, PS, PC, or polyester resin, or a quartz glass plate is preferable. Can be mentioned. The thickness of the light transmissive substrate is not particularly limited, but is preferably 1 mm to 10 mm.

≪Light diffusion layer≫
The light diffusion layer is formed by a printing method using a printing ink for plastic made of polymer fine particles and a transparent binder.

<Printing ink for plastic>
[Polymer fine particles]
Examples of the polymer fine particles include fine particles made of transparent resin such as PS, PMMA, PC, and urethane. The shape of the polymer fine particles may be spherical or non-spherical such as rugby ball.

  The average particle diameter of the polymer fine particles is 3 to 20 μm, preferably 4 to 18 μm. When the thickness is less than 3 μm, the light transmittance is lowered, which is not preferable. When the thickness exceeds 20 μm, the light diffusibility is poor and the brightness of the display surface is decreased.

  The fine polymer particles may contain a phosphor (phosphor), various selective wavelength pigments and dyes. As the phosphor, for example, “Luminova” manufactured by Nemoto Special Chemical Co., Ltd. (G-300C, G-300M, G-300F, G-300FF, G-300FFS, BG-300M, BG-300F, BGL-300FF, V- 300C, V-300M), GSS, GB-U, and other phosphorescent phosphors. Examples of fluorescent dyes and wavelength selective dyes include “UVITEX OB” manufactured by Ciba Specialty Chemicals, “Lumogen F” manufactured by BASF (Yellow083, Orange240, Red300, Violet 570), and the like.

  Examples of polymer fine particles that can be suitably used in the present invention include “Techpolymer MBX series” (crosslinked polymethyl methacrylate resin beads) and “Techpolymer SBX series” (crosslinked polystyrene resin beads) manufactured by Sekisui Plastics Co., Ltd. ) And the like.

In addition, it is preferable to use polymer fine particles having a porous shape because a high-luminance display surface can be obtained even when the content is small. The specific surface area of the fine polymer particles having a porous shape is preferably 1 to 300 m ² / g. When the specific surface area is less than 1 m ² / g, the effect of improving the brightness may be lowered, and when the specific surface area exceeds 300 m ² / g, the strength of the polymer fine particles becomes weak, and when printing ink is produced. In some cases, polymer fine particles may collapse. Preferable examples of the polymer fine particles having a porous shape include “Techpolymer MBP series” (crosslinked polymethyl methacrylate-based porous fine particles) manufactured by Sekisui Plastics Co., Ltd. Polymer MBP-8 ”(average particle size 8 μm, specific surface area 85 m ² / g, pore size 200 mm) is particularly preferable.

  Below, the specific measuring method of the average particle diameter and specific surface area of a polymer microparticle is described.

(1) Average particle diameter The average particle diameter is a volume average particle diameter measured by a Coulter Multisizer II manufactured by Beckman Coulter. In addition, regarding the measurement, it calibrated and measured using the aperture suitable for the particle diameter of the particle | grain to measure according to Reference MNUAL FOR THECOULTER MULTISIZER (1987) of Coulter Electronics Limited.

  Specifically, 0.1 g of particles are preliminarily dispersed in 10 ml of a 0.1% nonionic surfactant solution using a touch mixer and ultrasonic waves, and this is provided with an ISOTON I I (manufactured by Beckman Coulter, Inc .: In a beaker filled with (electrolytic solution for measurement), it was dropped with a dropper while gently stirring, and the reading of the densitometer on the main body screen was adjusted to around 10%. Next, the aperture size, Current, Gain, and Polarity were input to the multi-size I I main body according to Reference MANUAL FOR THE MULTILIZER MULTISIZER (1987) issued by Coulter Electronics Limited, and measured manually. During the measurement, the beaker is gently stirred to the extent that bubbles do not enter, and the measurement is terminated when 100,000 particles are measured, and the measured value is taken as the average particle diameter.

(2) Specific surface area The specific surface area is an automatic specific surface area / pore distribution measuring device (Shimadzu Corporation) based on the BET multipoint capacity method of JIS Z8830: 2001, which is a method for measuring the specific surface area of powder (solid) by gas adsorption. Measurement was performed using nitrogen gas by Tristar 3000 / Bacuprep 061LB).

[Transparent binder]
The transparent binder preferably contains at least a transparent resin solid content, preferably a solvent-soluble resin solid content, and further contains an organic solvent from the viewpoint of printability. As the resin solid content, for example, an acrylic resin, a polyester resin, a urethane resin, or the like can be used.

  Examples of the acrylic binder that can be used in the present invention include “Dianar Series” manufactured by Mitsubishi Rayon Co., Ltd., and examples of the polyester resin include “Byron Series” manufactured by Toyobo. Furthermore, examples include acrylic 13 medium, VG medium, and polyester EG medium manufactured by Teikoku Ink.

  The transparent binder may be appropriately selected in consideration of the type of the light-transmitting substrate, the particle diameter / shape / refractive index of the polymer fine particles, etc., but the refractive index Np of the polymer fine particles and the refractive index Nb of the transparent binder are | It is preferable to use a transparent binder that satisfies Np−Nb | ≧ 0.03, more preferably | Np−Nb | ≧ 0.035. When such a transparent binder is used, a high-luminance display surface can be obtained even when the amount of polymer fine particles is small. Specifically, when using Sekisui Plastics Co., Ltd. Techpolymer SBX-6 (crosslinked polystyrene fine particles, average particle diameter 6 μm, refractive index 1.59) as the polymer fine particles, the refractive index is 1 as the transparent binder. .49 acrylic resin or a polyester resin having a refractive index of 1.53 can be suitably used.

  In addition, you may mix the said fluorescent substance (phosphor), various selection wavelength pigments, and dyes with a transparent binder.

  Below, the specific measuring method of the refractive index of a polymer microparticle and a transparent binder is described.

(1) Method for measuring refractive index of polymer fine particles 0.001 g of polymer particles on a slide glass, and a liquid organic compound having a refractive index arbitrarily selected by the publication “Atago Refractometer Data Book” (published by Atago Co., Ltd.) 0 The particles were dispersed in 2 ml to prepare a sample plate. Next, each sample plate was set in an optical microscope and observed using a sodium lamp as a light source, and it was confirmed that the outline of the particles became invisible at a temperature where the refractive index of each liquid organic compound was known. The refractive index of the liquid organic compound was taken as the refractive index of the particles.

As the liquid organic compound and its refractive index, the above-mentioned publications include, for example,
“Furfurylamine (17 ° C.): refractive index 1.4900,
p-diethylbenzene ... refractive index 1.4948 "
However, as the refractive index, a value obtained by rounding off the fourth decimal place was adopted.

(2) Method for measuring refractive index of transparent binder A material obtained by pulverizing a transparent binder into particles of about 1 mg or less per particle was measured by the same method as in the case of the polymer fine particles.

[Combination ratio]
The blending ratio of the polymer particles and the transparent binder is 10 to 40% by weight of polymer particles, 90 to 60% by weight of transparent binder, preferably 20 to 30% by weight of polymer particles, and 80 to 70% by weight of transparent binder. If the polymer fine particle is less than 10% by weight, the content of the polymer fine particle is small with respect to the printing area, so that the light diffusibility is poor and sufficient display surface brightness may not be obtained. On the other hand, if the polymer fine particle exceeds 40% by weight, the printability may be lowered depending on the printing method and the shape of the polymer fine particle, which is not preferable.

<Printing method>
The printing method is not particularly limited, and for example, known methods such as screen printing, gravure printing, and offset printing can be applied. Among these, screen printing has a wide selection range such as the particle size / mixing ratio of the polymer fine particles, the printed film thickness of the light diffusion layer, and the material of the transparent binder, and it is possible to freely design brightness and directivity. Yes, it is preferable.

<Haze, total light transmittance>
The light diffusion layer has a haze of 90% or more, preferably 91% or more, and a parallel light transmittance of 10% or less, preferably 8% or less. By setting in such a range, a display surface with higher luminance can be obtained.

≪Light reflecting surface≫
It is preferable that the printed display body of the present invention has a light reflection surface on a surface other than the observation surface (light emission side surface) because luminance and directivity are improved. The light reflecting surface may be provided on the printed display body itself on the side opposite to the observation surface, on the side surface other than the surface on which the edge light source is installed, or on the inner surface of the display body case for fixing the printed display body. Good.

  Examples of the light reflecting surface include a mirror surface, an inclined surface as shown in FIG. 3 (a), and a Fresnel lens / prism surface as shown in FIG. 3 (b). Furthermore, on the surface on which these structures are formed, or on the surface of the light diffusion layer as shown in FIG. 3C, metal vapor deposition (Ag, Al, etc.) treatment, bonding / transfer of metal foil / metal vapor deposition film, etc. Further, a pearl color / white coating film may be formed.

(2) Second Embodiment FIG. 4 is a view showing an example of a print display body according to the second embodiment of the present invention. FIG. 4 (a) is a schematic sectional view of the print display body, and FIG. 4 (b). FIG. 3 is a schematic cross-sectional view showing the luminance and directivity of outgoing light in a light diffusion layer. The printed display body of FIG. 4 is the same as the first embodiment except that the light diffusing layers 2 a and 2 b are formed on both surfaces of the light transmissive substrate 1. According to this embodiment, it is possible to obtain a display such as a three-dimensional effect, texture, and depth.

  That is, as shown in FIG. 4B, when light is projected from the surface side on which the light diffusing layer 2b is formed, the luminance and directivity of the emitted light 8a of the light diffusing layer 2a on the observer side are the emitted light luminance. 10a, and the luminance and directivity of the outgoing light 8b of the light diffusion layer 2b on the side opposite to the observer side are the outgoing light luminance 10b. Accordingly, the light emission luminance of the surface on the viewer side becomes a luminance distribution by the synthesis of the light diffusion layers 2a and 2b, and a difference from the luminance distribution of only the reflected light of the light diffusion layer 2b occurs, and the three-dimensional effect, texture, depth, etc. A display is obtained. Display of three-dimensionality, texture, depth, and the like can be designed freely according to the mixing ratio and film thickness of the polymer fine particles in the light diffusion layers 2a, 2b, and various display images can be obtained.

(3) Third Embodiment FIG. 5 is a diagram showing an example of a print display body according to a third embodiment of the present invention. As shown in FIG. 5 (b), the printed display body of this embodiment includes a plurality of printed display bodies 100a, 100b, and 100c having the light diffusion layers 2 formed in different patterns as shown in FIG. 5 (a). The light diffusion layers 2 are superposed so that they are on the same side. According to this embodiment, it is possible to display a stereoscopic effect, texture, depth, and the like more effectively than the print display body of the second embodiment. Needless to say, the print display of the second form may be used instead of at least one of the print displays 100a, 100b, and 100c.

<Example 1>
Printing ink for plastic (20% by weight of the following polymer fine particles, 80% by weight of the transparent binder below) is applied to the non-mirror surface of the PMMA sheet (“Delaglass A999” manufactured by Asahi Kasei Corporation, size 100 mm × 100 mm × 5 mm). Then, as shown in FIG. 6A, the light diffusion layer 2 was screen-printed (plate mesh # 250) to obtain a printed display.

[Polymer fine particles]
Sekisui Plastics Co., Ltd. “Techpolymer MBX-5” (cross-linked polymethyl methacrylate resin beads, spherical, average particle diameter 5 μm, refractive index 1.49)

[Transparent binder]
Resin solids ("Dainal BR-100" manufactured by Mitsubishi Rayon Co., Ltd., acrylic resin binder BR, refractive index 1.49) 40 wt%
Solvent (toluene 70wt% / butanol 30wt% mixed solvent) 60wt%

  The haze and parallel light transmittance of the light diffusion layer 2 of the printed display were measured by the method described in JIS K7136: 2000 “How to Obtain Haze of Plastic Transparent Material”. The results are shown in Table 1.

  Further, as shown in FIG. 1 (a), the printed display body is set in a commercially available edge light type LED light source unit, and a light measuring layer 2 in the center is used by using a luminance measuring device “CS-100” manufactured by Konica Minolta. A luminance measurement of the part was performed. The results are shown in Table 1.

  In addition, when a black sheet is placed on the side opposite to the viewing surface of the printed display when set in the light source unit, the character part (light diffusion layer 2) is white and the part other than the character part is black, and the character is clear. Displayed. In addition, when a blue background color was used, the portions other than the character portion became blue.

<Examples 2-5, Comparative Examples 1-3>
A printed display was produced and evaluated in the same manner as in Example 1 except that the polymer fine particles or the blending amount thereof were changed as shown in Table 1. The results are shown in Table 1.

The polymer fine particles used in each example are as follows.
MBX-20: Sekisui Plastics Co., Ltd. “Techpolymer MBX-20” (cross-linked polymethyl methacrylate resin beads, spherical)
MBX-60: Sekisui Plastics Co., Ltd. “Techpolymer MBX-60” (cross-linked polymethyl methacrylate resin beads, spherical)
MBP-8: Sekisui Plastics Co., Ltd. “Techpolymer MBP-8” (cross-linked polymethyl methacrylate porous fine particles, spherical, specific surface area 85 m ² / g, pore diameter 200 mm)
SBX-6: Sekisui Plastics Co., Ltd. “Techpolymer SBX-6” (cross-linked polystyrene resin beads, spherical)

<Comparative example 4>
A printed display was produced and evaluated in the same manner as in Example 1 except that commercially available silica (“Mizcal P510” manufactured by Mizusawa Chemical Co., Ltd.) was used instead of the polymer fine particles. The results are shown in Table 1.

<Example 6>
As shown in FIG. 6B, a printed display was manufactured in the same manner as in Example 1 except that the light diffusion layer 2 was formed around the character portion.

  As in the case of Example 1, when a black sheet is disposed on the side opposite to the observation surface of the printed display body when set in the light source unit, the portion other than the character portion (light diffusion layer 2) is white and the character portion. Became black and the characters were clearly displayed.

  When a blue light source, a red light source, and a green light source are used as the edge light source, portions other than the character portion (light diffusion layer 2) are colored blue, red, and green, respectively, and the character portion is black. Was clearly displayed. Furthermore, the character portion was displayed in the same color as the background color by changing the background color.

  In addition, when the polymer fine particles or transparent binder is colored, or when a selective wavelength pigment or dye is mixed, the light diffusion layer is colored by various colorants or selected wavelengths, and various synthetic colors can be displayed in combination with the light source color. .

<Example 7>
As shown in FIG. 7 and FIG. 8, as shown in FIG. 7 and FIG. A light diffusing layer 2a having a cloud shape and a light diffusing layer 2b having a cloud pattern on the other surface were printed. At this time, a green colorant was mixed with a transparent binder at the base part of Mt. Fuji, and a light brown colorant was mixed at a part of the mountain surface.

  A black sheet was placed on the side opposite to the observation surface of the printed display, and the light source unit used in Example 1 was set so that the surface on which the Mt. Fuji picture pattern was formed was the observation surface side. When the printed display is viewed from the front with the edge light source turned off, there is no shadow between Mt. Fuji and the clouds as shown in FIG. As shown in (b), a shadow appeared between Mt. Fuji and the clouds along the ridgeline of Mt. Fuji. The reason for this will be described with reference to FIG.

  When viewed from the front, as shown in FIG. 8 (a), the ridge line of Mt. Fuji (light diffusion layer 2a) printed on the observation surface of the light-transmitting substrate 1, and the cloud printed on the other surface The (light diffusion layer 2b) overlaps to form a straight line instead of a double image. On the other hand, when viewed from an oblique direction, as shown in FIG. 8B, the ridgeline (light diffusion layer 2a) of Mt. Fuji printed on the observation surface of the light-transmitting substrate 1 and the other surface are printed. The cloud image (light diffusing layer 2 b) appears to be separated by the thickness of the light-transmitting substrate 1 to form a double image α. Therefore, when viewed from the front and obliquely, the same image looks different in 3D, texture, and depth. Note that this appearance increases in proportion to the thickness of the light-transmitting substrate.

  Thus, according to the present embodiment, it was proved that a display with a three-dimensional feeling, texture, and depth can be achieved.

  Next, when the edge light source was turned on and yellow-green light was transmitted, when viewed from an oblique direction, it looked more orange than when viewed from the front. Similarly to the case where the lights were off, a shadow was seen between Mt. Fuji and the clouds along the ridgeline of Mt. Fuji when viewed from an angle. Furthermore, when the color of the edge light source is blue or red, the uncolored part and the lightly colored part (clouds, mountain surface) are shining blue or red, and the darkly colored part (skirt) is blackish. It was a three-dimensional effect.

  As described above, in the printed display body of the present embodiment, the light diffusion layer 2a printed on the observation surface side is raised and displayed on the front surface, and the light diffusion layer 2b printed on the other surface is light-emitting displayed on the rear surface. Therefore, it was possible to display with greater perspective, stereoscopic effect, texture and depth.

<Example 8>
As shown in FIG. 5A, three printed display bodies 100a, 100b, and 100c were manufactured in the same manner as in Example 1 except that the square light diffusion layer 2 was formed. Next, as shown in FIG. 5B, the printed display body 100 a having the largest area of the light diffusion layer 2, the printed display body 100 b having the second largest area of the light diffusion layer 2, and the area of the light diffusion layer 2. Are stacked so that the light diffusing layer 2 is on the same side in the order of the smallest printed display body 100c.

  A black sheet was placed on the side opposite to the observation surface of the printed display, and the light source unit used in Example 1 was set so that the light diffusion layer 2 formation surface was on the observation surface side. When the edge light source is turned off, the portion where the three light diffusion layers 2 overlap, that is, the portion where the light diffusion layer 2 of the printed display body 100c is formed is the whitest and the front row. It seemed to stand out on the surface most. Next, the portion of the printed display body 100b where the light diffusing layer 2 was formed (except for the portion of the printed display body 100c where the light diffusing layer 2 was formed) appeared to appear second white. Thus, it has been proved that the present embodiment can provide a three-dimensional texture and a deeper display than the other embodiments.

  Next, when the red edge light source is turned on, the brightness closer to the light source is higher, so when viewed from the front, the closer to the light source shines white, and the further away from the light source, the more red reproducibility appears. It was. On the contrary, when viewed from an oblique direction, it was proved that the red reproducibility is better near the light source. Accordingly, it has been found that when a plurality of printed display bodies are used in an overlapping manner, various color emission luminance can be designed by changing the blending ratio of the polymer fine particles in the distance of the light source.

It is a schematic sectional drawing which shows an example of the display apparatus using the printing display body of this invention. It is the structure sectional drawing which showed the brightness | luminance and directivity of the emitted light from a light diffusion layer. It is a schematic sectional drawing which shows the specific example of a light reflection surface. It is a figure which shows an example of the print display body which concerns on the 2nd form of this invention. It is a figure which shows an example of the print display body which concerns on the 3rd form of this invention. It is a top view of the printed display body manufactured in the Example. FIG. 10 is a view showing a printed display manufactured in Example 7. FIG. 8 is a diagram for explaining the reason why the printed display body in FIG. 7 looks different depending on the viewing angle.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Light transmissive base material 2, 2a, 2b Light diffusion layer 3 Edge light light source 4 Light source fixing stand 5 Display body case 6 Straight light 7 Reflected light 8, 8a, 8b Outgoing light 9 Observer 10 Outgoing light luminance 11 Incident light 12 Polymer fine particle 13 Light reflecting surface 100, 100a, 100b, 100c Print display body α Double image

Claims (3)

  A printed display body having a light diffusion layer formed in a pattern on at least one surface of a light-transmitting substrate and emitting light by light from an edge light source, wherein the light diffusion layer has an average particle diameter of 3 It is formed by a printing method using a printing ink for plastic composed of 10 to 40% by weight of polymer fine particles of -20 μm and 90 to 60% by weight of a transparent binder, and has a haze of 90% or more and a parallel light transmittance of 10% or less. A printed display body characterized by that.   The printed display body according to claim 1, wherein the polymer fine particles have a porous shape.   3. The printed display according to claim 1, wherein a refractive index Np of the polymer fine particles and a refractive index Nb of the transparent binder satisfy | Np−Nb | ≧ 0.03.

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