JP2007114271A - Display device provided with enclosed lens type light-transmissive retroreflection sheet - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve the problem that concerning the conventional enclosed lens type retroreflection sheet (320), light (803) incident from a rear face is reflected (804) by shielding property of aluminum (305) deposited on the outer periphery of a binder layer as shown in Fig. 26 and can not reach a surface, therefore, the conventional enclosed lens type retroreflection sheet can not be used for a display device of a type brightly illuminating a display face (1) by a transmission light method that has an electric light source (5) in a casing inside of an internal illumination type display device of Fig. 3, a light guide type display device or the like in Fig. 4 (not shown) widely spreading regardless of indoor or outdoor. <P>SOLUTION: The display device is provided with the display face comprising a display part, a reflection part, and a rear face part in which incident light from the surface is retroreflected and light from a rear face transmitted. The reflection part is provided with an adhesive, an adsorbent, a resin, glass, ceramic, paint, a storage substance and the like having transparency or light transmission. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention includes display devices such as signs, signboards, displays, etc. for interior illumination, non-interior illumination, exterior illumination, light guide, phosphorescence, reflection, etc., automobiles, bicycles, wheelchairs, prams, ships The present invention relates to a display device provided on a vehicle such as an aircraft, a wall surface or a pillar of a building, a ceiling, a floor, a window, or a staircase.

  In general, since the display device is intended to transmit information, it is natural that the display surface (1) in FIG. 3 on which information is described always requires high visibility regardless of day or night. For this reason, conventionally, internally illuminated display devices, light guide display devices, and the like that brightly illuminate the display surface using electric illumination have been widely used indoors and outdoors.

The internal illumination type display device of FIG. 1 transmits the light of the internal illumination (5) provided inside the casing (6) from the back surface to illuminate the display surface brightly, thereby improving the visibility.
The light guide type display device of FIG. 2 causes a light guide plate (7) made of a transparent acrylic plate or the like to guide light from a light source such as a cold cathode tube (5) or an LED, and displays a display surface ( Visibility is improved by illuminating 1) brightly from the back.
However, since both internal-light display devices and light-guided display devices illuminate the display surface (1) with electric lighting, there is a risk of losing their functions in the event of a power failure or failure due to an accident or disaster. It was.

  On the other hand, a display device such as a traffic sign is often used with a display device having retroreflective performance, and it is reflected brightly on a headlight of an automobile without using electric lighting to ensure visibility from the driver.

  A display device having retroreflective performance generally uses a retroreflective sheet that has been subjected to character processing and printing as a display surface by being attached to a plate-like support. The retroreflective sheet is used not only for the road sign shown in FIG. 27 but also for signboards, barricades, tapes, etc. on construction sites taking advantage of its reflection performance as in the utilization examples shown in FIGS.

  Retroreflective sheets are roughly divided into two types. One is a prism type in which a resin is molded into a triangular pyramid, and one is a glass bead used as an optical convex lens. Further, the glass bead type retroreflective sheet is roughly divided into two types, an encapsulated lens type (320) in FIG. 25 and an open bead type (330) in FIG.

  As shown in FIG. 25, the conventional encapsulated lens type retroreflective sheeting mechanism is such that the glass beads (301) serving as an optical convex lens refract incident light (801) (307) and focus the light. Collect 1 point. The space through which the light reaches the focal point is formed by the binder layer (302). That is, the thickness of the binder layer (302) is derived from the focal length of light as a convex lens of the glass beads. Next, the aluminum vapor deposition layer (305) provided on the outer periphery of the binder layer serves as a reflecting mirror to reflect the focused light. The reflected light is redirected again by the optical refraction action (307) of the glass beads and returned to the light source (8) (802).

The encapsulated lens type retroreflective sheet has excellent compatibility with printing, which is indispensable for a display device, as well as low manufacturing cost and good workability. However, as shown in FIG. Since the aluminum vapor deposition layer (305) which shields is provided, it cannot be used as a display surface of an internally-illuminated display device or a light guide display device which displays brightly by illuminating with an electric light source from the back surface.
Therefore, if an encapsulated lens type retroreflective sheet is provided with a system that reflects light other than the aluminum vapor deposition layer (305) and can be used as a display surface for an internally-illuminated display device, a light guide display device, or the like, a power failure, failure, etc. It can also be used as a backup during non-lighting, and can respond to the needs of society as a countermeasure for wide-area disasters such as earthquakes and tsunamis that require evacuation guidance. Furthermore, if a light storage function can be provided, it can be a more advanced emergency display device.

Therefore, in the present invention, an encapsulated lens type translucent retroreflective sheet that applies the principle of a critical angle based on optics is devised so that the encapsulated lens type retroreflective sheet has translucency. It can be used as a display surface of a display device such as a formula.
JP 2002-67208 A JP 2004-301977 A JP 2004-36161 A JP 2005-181484 A

  The above prior art has been pointed out due to the following problems.

  (A) In the conventional encapsulated lens type retroreflective sheet (320), the light (803) incident from the back surface is rebounded by the concealment property of the aluminum (305) deposited on the outer periphery of the binder layer as shown in FIG. (804) and cannot reach the surface. Therefore, it has an electrical light source (5) inside the casing, such as the internally illuminated display device of FIG. 3 and the light guide display device of FIG. It cannot be used for a display device of a type that brightly illuminates the display surface (1).

(B) Since the conventional encapsulated lens type retroreflective sheet (320) does not have transparency as described above, the light of the phosphorescent material cannot be transmitted through the back surface. Therefore, at present, a technique of printing phosphorescent ink on the surface of a conventional encapsulated lens type retroreflective sheet (320) is used, and it is widely used as a phosphorescent printed retroreflective sign shown in FIGS. This product is a good product because it has both retroreflective and phosphorescent light emission functions, but when it is actually installed on the walls of a room and darkened, the phosphorescent material shines brighter than expected. It is often noticed that they are not. This is because, after the phosphorescent material accumulates the light from the outside, it is an absolute condition that it is in a bright place until it becomes dark due to the property of emitting the light.
That is, when the retroluminescent reflection sign of FIG. 30 is retroreflected in the dark, the luminous ink printing layer (203) does not have sufficient light transmission necessary for retroreflection and was drawn by the luminous ink printing. The green emergency exit mark portion appears dark black due to strong contrast of light and dark. For this reason, the impression on the display surface is changed, which indicates that the constancy of an important design cannot be maintained in an evacuation guidance sign that requires high recognition.

  (C) When the appearance of the display surface during retroreflection is verified by applying light such as a flashlight to the phosphorescent printed retroreflection sign, the portion of the white encapsulated lens type retroreflective sheet that is retroreflecting is While it looks bright and clear, the portion printed with green phosphorescent ink looks dim and close to black as shown in FIG. . This occurs because the human eye looking at the bright side adjusts the amount of light, and as a result, it feels dark in a portion that cannot be retroreflective printed with highly concealed phosphorescent ink. When this phosphorescent printed retroreflective sign is used as a display device that requires urgency, such as an evacuation guide sign, the emergency exit mark or character that is normally recognized as green will suddenly appear dark in an emergency. There is a risk that the judgment power may be reduced for a moment, and there is a risk of oversight.

  (D) This time, instead of retroreflection, when the appearance of the display surface when the phosphorescent ink emits light in the dark is verified, naturally the portion not printed with the phosphorescent ink does not store phosphorescent light as shown in FIG. Therefore, the exposed portion of the material of the white encapsulated lens type retroreflective sheet is still dark and appears close to black due to the human visual mechanism. Furthermore, human eyes tend to be easier to read what is bright on the entire display surface and has a large amount of light than those in which only a part of characters or marks is bright. Phosphorescent printed retroreflective signs are not ideal display measures in terms of legibility and visibility. In addition, as described in (c), design and color constancy are very important for identification in a display device. In the event of a sudden attack, if the design and color of the display surface suddenly change and become difficult to understand, the purpose of the original evacuation guide sign may not be achieved.

  (E) As shown in FIG. 34, some open bead retroreflective sheets (330) are not subjected to aluminum vapor deposition and can transmit light (803) incident from the back surface to the surface. However, as shown in FIG. 35, the glass beads are exposed on the surface of the open bead type retroreflective sheet, and when the ink is printed on it, the refractive index of the optical light of the glass beads changes. As a result, the focal length shifts. For this reason, retroreflection performance is lost. Therefore, an open bead type retroreflective sheet cannot be used for a display device that requires printing on the display surface.

  (F) As another aspect, since the conventional encapsulated lens type retroreflective sheet is subjected to aluminum vapor deposition, the color of the aluminum passes through the surface and becomes gray, so the whiteness is lost. If you print on it, it will affect pictures, pictures, characters, etc., and the vividness will be lost, so it is difficult to reproduce the beauty of color.

  (G) Since the encapsulated lens type retroreflective sheet is not transmissive as described above, it is not possible to see the color and pattern of the material provided on the back surface as well as the light on the display surface.

  In order to solve the above-mentioned problems, the present invention includes a reflective portion (3) and a back portion (4) that retroreflect incident light from the front surface of the display portion (2) and transmit light from the back surface. A display device having a display surface (1) is provided.

  According to the present invention, the visibility when a display device such as a guide light equipped with electric illumination is not turned on can be secured by the retroreflection function.

  The retroreflective function reflects brightly to a flashlight and a headlight of an automobile, so that the display surface can be easily recognized even when the display device is turned off. Even when the lights are suddenly turned off, the visibility of traffic signs and the like can be maintained, which can greatly contribute to traffic safety. In addition, in the event of a disaster, the emergency exit can be found, confirmed, and secured more quickly and smoothly by being brightly retro-reflected by the flashlight used by police officers and firefighters and rescue crews. It can be useful for facilitation and prevention of secondary disasters.

In the present invention, it is possible to selectively use the material of the reflecting portion (3) and the back surface portion (4) according to the purpose, and it is possible to add functions and cope with various uses.
In particular, by providing the phosphorescent substance (402), it is possible to ensure visibility when the display device is not lit or not retroreflected by phosphorescent emission.

In the present invention, the display surface (1) of the display device includes a display unit (2), a reflection unit (3), and a back surface unit (4), and the internally illuminated display device shown as an example in FIGS. In addition, it is possible to brightly display the transmitted light when the internal light source (5) provided in the light guide type display device or the like is turned on, and at the same time brighten the display surface (1) by retroreflection to the external light source (8) when not turned on. It is the development of a display device that can display.
In order to achieve this purpose, it was necessary to develop an encapsulating lens type translucent retroreflective sheet (310) having light permeability.

  Unlike the conventional encapsulated lens type retroreflective sheet (320), the encapsulated lens type translucent retroreflective sheet (310) of the reflecting portion (3) is different from the conventional encapsulated lens type retroreflective sheet (320) as shown in FIG. The layer (305) is not provided, and retroreflection is realized by the coastal angle (306).

The critical angle (306) refers to the minimum value of the incident angle that causes total reflection when light is incident on a material having a high refractive index from a material having a high refractive index. In concrete examples, the sky and surrounding scenery are reflected on the water surface of ponds and lakes, and the phenomenon that the water cannot be seen is often cited. This is a phenomenon that occurs when a large portion of light is rebounded by total reflection when light is about to enter light having a high refractive index into water having a low refractive index.
(Literature of the seaside angle http://www.wakasa-opt.com/kaisetu.html)

In the present invention, the optical convex lens effect (307) of the glass beads (301) condenses the light at a single point, and the angle of focusing is applied as the minimum value of the incident angle necessary for total reflection. The focal length necessary for focusing is provided by a binder layer (302) having a high refractive index, and a light-transmitting reflective layer (303) is provided by using a material having a low refractive index around it.
Then, the light focused between the binder layer (302) and the translucent reflective layer (303) generates a critical angle (306) that can be called a light wall. Based on this principle, retroreflection by applying a sea angle was successful, and it became possible to manufacture an encapsulated lens type translucent retroreflective sheet (310).
That is, there is a critical angle relationship in which air corresponds to the binder layer (302) and the translucent reflective layer (303) corresponds to water.

  The binder layer (302) plays a role of efficiently transmitting the light collected by the glass beads (301) to the translucent reflective layer (303) and transmitting the light reflected by the critical angle to the glass beads again. Therefore, it is made of a material with high transparency and high transmission performance.

The translucent reflective layer (303) has a light refractive index smaller than that of the binder layer (302) and has light transmissivity, so that it can generate a critical angle necessary for retroreflection. It can be provided by an adhesive, adsorbent, resin, glass, ceramics, paint, phosphorescent substance, etc. having transparency, white, and other hues.
The encapsulated lens-type translucent retroreflective sheet (310) is a product with a wide range of applications that can be made into various specifications such as an adhesive sheet, a film, a fiber resin, a sheet such as cloth, and a board.

  For example, when the encapsulated lens type translucent retroreflective sheet (310) is manufactured in the form of an adhesive sheet, it can be used for vehicles such as cars, ships, trains, airplanes, etc. in addition to applications such as guide lights, signs, signs, signboards, etc. It can be applied to various places such as building walls and walls, window glass, doors, pillars, stairs, etc., and can be used widely as a display device.

  Since the translucent reflective layer (303) of the encapsulated lens type translucent retroreflective sheet (310) can be white, in this case, the conventional encapsulated lens in which the aluminum deposition reflective layer (305) can be seen through to the surface. Compared with a display device using a retroreflective sheet (320), the whiteness of the ground color of the display surface (1) can be increased, and a display device with vivid and beautiful color printing can be manufactured. it can.

  Since the translucent reflective layer (303) can be transparent, it is possible to manufacture a display device that transmits and displays the color and pattern of the material provided on the back surface, light, printing, painting, characters, images, etc. It is.

  FIG. 6 shows the transmission of light from the back surface, which was impossible with the aluminum-evaporated reflective layer (305) in the conventional encapsulated lens type retroreflective sheet (320), and the encapsulated lens type retroreflective sheet (310). This shows that it was made possible by eliminating the aluminum vapor deposition reflective layer (305).

  FIG. 7 shows the basic features of the translucent retroreflective display surface (110) of the present invention composed of the display portion (2), the reflection portion (3), and the back surface portion (4).

  The display unit (2) represents a printing ink layer (201) that represents characters, marks, patterns, photographs, pictures, etc. with ink or the like. Furthermore, it is also possible to provide a surface protective layer (202) such as laminating as required.

  The reflective portion (3) is made of an encapsulated lens type translucent retroreflective sheet (310), and includes glass beads (301), a binder layer (302), a translucent reflective layer (303), a printing ink receiving layer (304), and the like. It has a basic retroreflection function as a translucent retroreflection display surface.

  The encapsulating lens type translucent retroreflective sheet (310) of the reflective part (3) is excellent in printability because the ink receiving layer (304) is provided on the glass beads (301), and is an open bead type retroreflective sheet. As in (330), the retroreflection performance is not impaired by printing or the like.

  The back part (4) can be provided with a wide variety of materials such as resin, glass, cloth, non-woven fabric, fiber resin, ceramics, and phosphorescent material with light transmission, and it can be provided in sheet or board form according to the application. A translucent retroreflective display surface (110) having various performances such as the above can be formed. The display surface represents the display of emergency exits and advertisements, and also has a function of transmitting light when there is an internal light source.

  8 and 9 show one embodiment of the present invention, and FIG. 8 shows that a light-transmitting retroreflective display surface (110) transmits light from an internal light source (5) provided in the display device. It is displayed brightly. FIG. 9 shows that the display surface is brightly displayed by retroreflecting the light of the external light source (8) when the internal light source (5) is not lit, and visibility can be ensured.

FIG. 10 shows an embodiment of the present invention, in which an encapsulating lens type translucent retroreflective sheet (310) in which a translucent reflective layer (303) is provided with a phosphorescent material (402) (not shown) This is a case where the translucent retroreflective phosphorescent display surface (120) provided in (3) is provided as the display surface (1) of the internally illuminated display device.
The translucent retroreflective phosphorescent display surface (120) of the type provided with a phosphorescent material on the translucent reflective layer (303) is also suitable when the internal light source (5) of the display device is not lit or not retroreflective. It shows that the visibility of the display surface (1) is maintained by storing and emitting light stored during lighting near the internal light source (5).

  As described above, the translucent reflective layer (303) can generate the critical angle (306) necessary for retroreflection if the refractive index of light is smaller than that of the binder layer (302). It is also possible to provide a phosphorescent material (402) having a lower refractive index of light than 302).

  In this type, since the phosphorescent substance (402) is already provided in the encapsulated lens-type translucent retroreflective sheet (310), the phosphorescent substance (402) can be processed in a separate process such as printing or coating. Therefore, the translucent retroreflective phosphorescent display surface (120) can be efficiently manufactured.

  The translucent retroreflective phosphorescent display surface (120) thus obtained is the visibility of the display surface (1) by phosphorescent emission even when the internal light source (5) of the display device is not lit or nonretroreflective. Can be secured. In addition, since the light stored in the vicinity of the internal light source (5) until immediately before the light is turned off is stored on the entire display surface, it has an overwhelming advantage in light emission luminance and afterglow time compared to conventional phosphorescent signs and the like. .

  Furthermore, since the phosphorescent material (402) has the light transmission necessary for the translucent display surface, it functions as a normal display surface (1) when the internal light source (5) of the display device is turned on. Can be held.

  In addition, since it is possible to provide the phosphorescent substance (402) over the entire surface of the translucent reflective layer (303), the conventional reflective material is printed with phosphorescent ink, and a sign that shines only a part of a mark, a character, etc. In contrast, the entire display surface can be retroreflective or phosphorescent-emitted, and sudden evacuation can be achieved by preventing changes in the image of the display surface during the internal light source (5) emission, retroreflection, or phosphorescent emission of the display device. Even when the guide lights are turned off, the design remains constant and high recognition is achieved.

  The translucent retroreflective display surface (110) and translucent retroreflective phosphorescent display surface (120) have high weather resistance and water resistance. Since it is not lost, the display device according to the present invention can be used as a display device for evacuation guidance in a typhoon or the like accompanied with a large amount of wind and rain due to abnormal weather in recent years.

  The high-intensity phosphorescent light emission and long-time afterglow performance of the translucent retroreflective phosphorescent display surface (120) can greatly help evacuation guidance in the event of a power failure due to an accident or disaster. In addition, the storage battery provided in the guide light may only be able to light for about 30 to 60 minutes, and since it requires regular replacement and maintenance, it may become unlit due to poor maintenance or battery life. there is a possibility. In the present invention, the long-time high-intensity phosphorescent light-emitting performance can be maintained semipermanently almost maintenance-free, and can be used as an emergency backup light source such as an evacuation guide light.

  Since the casing of the existing display device can be used as it is, only the display surface can be replaced with the translucent retroreflective display surface (110) or translucent retroreflective phosphorescent display surface (120) of the present invention. Functional guidance displays can be deployed at low cost and contribute to society as an effective disaster prevention measure.

  FIG. 11 shows an embodiment of the present invention, in which a translucent retroreflective phosphorescent display surface (120) provided with a phosphorescent substance (402) on the back surface of the back surface portion (4) is replaced with a display surface ( The case where it has prepared as 1) is shown. Since this embodiment is close to the internal light source, it has good phosphorescent properties, and the visibility of the display surface is good when not lit. In addition, since the phosphorescent material (402) that is incombustible is provided on the back surface of the back member (401), even if an abnormality occurs in the electric system of the internal light source (5) and it has heat, It has the feature that it is harder to ignite than the display surface (1) of the resin plate.

FIG. 12 shows a translucent retroreflective phosphorescent display surface (120) in which a phosphorescent material (402) is provided between the translucent reflective layer (402) and the back member (401). One embodiment of the present invention when provided as (1) is shown. In this embodiment, the phosphorescent material (402), which is easily scratched by rubbing, is sandwiched between the back member (401) and the encapsulated lens-type translucent retroreflective sheet (310) and is not exposed, so it has scratch resistance. ing.
The translucent retroreflective phosphorescent display surface (120) phosphorescently emits the light stored during lighting close to the internal light source (5) even when the internal light source (5) of the display device is not lit or non-retroreflective. This indicates that the visibility of the display surface (1) is maintained.

FIG. 13 shows another embodiment of the present invention, in which a translucent retroreflective phosphorescent display surface (120) provided with the entire back surface (4) as a layer of a phosphorescent material (402) is provided as an internally illuminated display device. This is an example of the display surface (1).
In this type, since the amount of the phosphorescent substance (402) can be increased as compared with others, a high phosphorescent emission luminance can be obtained.

  FIG. 14 shows a light emission mechanism of a light guide type display device that is generally used. The light guide type display device having a mechanism for guiding the light of the internal light source (5) to the light guide plate (7) made of a transparent acrylic plate or the like and radiating and illuminating it on the display surface (1) is a conventional internal illumination. Compared with the evacuation guide light of the display type display device, it is highly evaluated for its thinness and light weight.

FIG. 15 shows light-guided light emission in one embodiment provided with a translucent retroreflective phosphorescent display surface (120) as the display surface (1) of the light guide display device.
Since the light guide type display device includes the light retroreflective display surface (110) and the light transmissive retroreflective storage type display surface (120), the light guided to the light guide plate (7) is transmitted. Thus, a mechanism for ensuring sufficient brightness of the display surface as a display device is shown.
FIG. 16 shows the retroreflection performance when the above-described embodiment is in the non-light-guided light emission.

  FIG. 17 shows the phosphorescent light emission performance when the above embodiment is in the non-guided light emission.

  Furthermore, FIG. 18 is provided with a translucent retroreflective display surface (110) that gives retroreflective performance to the surface of the light guide plate (7) of the light guide display device, and a phosphorescent material layer (402) is also provided on the back surface. Fig. 2 shows phosphorescent light emission performance in one example. In this case, the phosphorescent material layer (402) provided on the back surface of the light guide plate (7) not only stores and emits light but also effectively diffuses and reflects the light guided into the light guide plate during the light guide emission. It also plays a role of increasing the light emission luminance.

  FIGS. 19 to 24 show one example in which the translucent retroreflective phosphorescent display surface (120) is used as a display device that does not include the electrical internal light source (5). There is no clearness of the display surface (1) by the internal light source (5), but it can be supplemented with an external light lamp, and above all, a display that can ensure visibility by the retroreflective function and the phosphorescent light emitting function In many cases, the device is useful for human life.

19 and 20 show an embodiment of the present invention, in which an encapsulated lens-type translucent retroreflective sheet (310) in which a luminous substance (303) is provided on a translucent reflective layer (303) is used as a reflective portion (3 The retroreflective and phosphorescent display surface (120) provided in () is used as a display device. In this case, the encapsulating lens type translucent retroreflective sheet (310) can be processed in a state where the phosphorescent material (303) is already provided, so that the phosphorescent material (303) is used in a separate process such as printing or coating. Therefore, the translucent retroreflective phosphorescent display surface (120) can be manufactured efficiently.
A translucent retroreflective phosphorescent display surface (120) of a type provided with a phosphorescent material in the translucent reflective layer (303) of the reflective portion (3) is displayed on an internal illumination display device, a light guide display device or the like. Even when the display device itself is used instead of being provided as a surface, it indicates that there is high visibility due to retroreflection.

FIGS. 21 and 22 show another embodiment of the present invention, in which a phosphorescent material (303) is provided on the back surface of the back surface portion (4), and a back surface protection material (403) for protecting the phosphorescent material is provided. The retroreflective performance and the luminous performance are shown when the translucent retroreflective phosphorescent display surface (120) imparted with scratching properties is provided as a display device.
In the case of this embodiment, the back surface protective material (403) has high hardness and high strength, and can be used in more severe environments. Even when the back surface protective material (403) is provided to be reinforced and used as a display device, it shows high visibility due to retroreflection.

23 and 24 show another embodiment of the present invention, and a translucent retroreflective phosphorescent display in which a phosphorescent material (303) is provided between the translucent reflective layer (303) and the back member (401). The surface (120) shows retroreflective performance and phosphorescent light emission performance when used as a display device.
In this embodiment, the phosphorescent material (303), which is easily scratched by rubbing, is sandwiched between the back member (401) and the encapsulated lens-type translucent retroreflective sheet (310) and is not exposed, so that it has scratch resistance. At the same time, since the back member (401) can be made of metal or the like, it is easy to impart high hardness and high strength.
A translucent retroreflective phosphorescent display surface (120) of the type having a phosphorescent material layer (402) between the translucent reflective layer (303) and the back member (401) uses itself as a display device. Even in this case, it indicates that there is high visibility due to retroreflection.

  Although the present invention has been described above, the present invention is not limited to the above-described embodiments, and various changes can be made by the operator within the scope of the technical idea of the present invention.

1 shows a conventional internally illuminated display device for evacuation guidance. The conventional light guide type display device for evacuation guidance is shown. The structure of the conventional internally illuminated display device for evacuation guidance and the state where the display surface (1) is removed are shown. The structure of the conventional light guide type display apparatus for evacuation guidance, and the state which removed the display surface (1) are shown. The principle of the retroreflection of the encapsulating lens type translucent retroreflective sheet (310) constituting the reflection part in one embodiment of the present invention will be described. The encapsulated lens type translucent retroreflective sheet (310) transmits light from the back surface. The principle of a typical embodiment in the display device of the present invention will be described. In one embodiment in which the present invention is used for the display surface (1) of an internally illuminated display device, the translucent retroreflective display surface (110) is brightly illuminated by transmitting the light of the internal light source (5). Indicates that The translucent retroreflective display surface (110) of one embodiment of the present invention maintains the visibility of the display surface (1) by retroreflection even when the internal light source (5) is not lit. It shows that. It is another Example of this invention, Comprising: The translucent retroreflection phosphorescence type | mold display surface (120) of the type provided with the phosphorescence substance in the translucent reflective layer (303) of a reflection part (3) is shown. The other Example of this invention is shown and the thing provided with the luminous substance on the back surface of the back member (401) is shown. In another embodiment of the present invention, a phosphorescent material layer (402) is provided as a part of the back surface (4) between the translucent reflective layer (303) and the back member (401). The thing is shown. The other Example of this invention is shown and the back surface part (4) whole is used as the luminous substance layer (402). The light emission mechanism of the conventional light guide type display device is shown. 1 shows an embodiment of the present invention in which a light guide display device is provided with a light retroreflective display surface (110) and a light translucent retroreflective phosphorescent display surface (120). The above-described embodiment of the present invention shows that the visibility of the display surface is maintained by retroreflection even during non-light-emitting light emission. One embodiment of the present invention of the type having the above-described translucent retroreflective phosphorescent display surface (120) is capable of performing phosphorescent light emission even during non-light-guided light emission or non-retroreflective reflection of the light guide display device. It shows that the visibility of the display surface is maintained. 6 shows another embodiment of the present invention, wherein a light retroreflective display surface (110) is provided on the surface of a light guide plate (7) of a light guide display device, and a phosphorescent material layer (402) is provided on the back surface. Represents the type. The other Example of this invention is shown, The translucent retroreflection phosphorescence type | mold display surface (120) of the type provided with the phosphorescence substance in the translucent reflection layer (303) of a reflection part (3) is internally illuminated. This indicates that there is high visibility due to retroreflection even when the display device is not provided as a display surface of a display device or a light guide display device, but is used as a display device. The above-described embodiment shown in FIG. 19 also shows high visibility due to phosphorescent emission. Furthermore, the other Example of this invention is shown and the type provided with the luminous material layer (402) on the back surface of the back member (401) is shown. 21 shows that the embodiment of FIG. 21 also has high visibility by phosphorescent emission. The other Example of this invention is shown and the type provided with the luminous substance layer (402) between the translucent reflective layer (303) and the back member (401) is shown. 23 shows that the embodiment of FIG. 23 also has high visibility by phosphorescent emission. The principle of the retroreflection of the conventional encapsulated lens type retroreflective sheet (320) is shown. This is the same as in FIG. In the above-mentioned conventional encapsulated lens type retroreflective sheet (320), the aluminum vapor deposition reflective layer (305) shows that light from the back surface is rebounded and cannot be transmitted. A part of the utilization example of the conventional retroreflection sheet is shown. A part of utilization example of the conventional retroreflective sheet is shown. A part of utilization example of the conventional retroreflective sheet is shown. The phosphorescent printed retroreflective sign is obtained by printing an emergency exit mark with green phosphorescent ink on a conventional white encapsulated lens type retroreflective sheet. The structure of the phosphorescent printed retroreflective sign of FIG. 30 is shown. When the phosphorescent printed retroreflective sign in FIG. 30 is retroreflected in the dark, the luminous ink printed layer (203) indicates that the light transmission necessary for retroreflection is not sufficient. FIG. 30 shows a case where the phosphorescent printed retroreflective sign in FIG. 30 phosphorescently emits light in the dark. A part of conventional open bead-type retroreflective sheet (330) having light transmittance from the back surface is shown. FIG. 34 shows a problem when the open bead type retroreflective sheet (330) having light transmittance shown in FIG. 34 is subjected to a printing process of the display surface (1) necessary for the display device.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Display surface 2 Display part 3 Reflection part 4 Back surface part 5 Internal light source 6 Casing part 7 Light guide plate 8 External light source 110 Translucent retroreflective display surface 120 Translucent retroreflective storage type display surface 201 Printing ink layer 202 Surface protection Layer 203 Phosphorescent ink printing layer 301 Glass beads 302 Binder layer 303 Translucent reflective layer 304 Printing ink receiving layer 305 Aluminum deposition reflective layer 306 Sea angle 307 Refraction of light by lens effect 308 Fixed layer 310 Encapsulated lens type translucent retroreflective Sheet 320 Conventional encapsulated lens type retroreflective sheet 330 Open bead type retroreflective sheet 401 Back member 402 Phosphorescent material 403 Back surface protective material 801 External light source incident light from the surface 802 Retroreflected light 803 External light source incident light from the back surface 804 is rebounded Light

Claims (4)

  A display device comprising: a display portion; a reflection portion that retroreflects incident light from the front surface and transmits light from the back surface; and a display surface including a back surface portion.   The reflective portion is an encapsulated lens-type translucent reflective layer, and includes a binder layer and a translucent reflective layer, and the translucent reflective layer is formed of a material having a light refractive index smaller than that of the binder layer. The display device according to claim 1.   The display device according to claim 1, wherein the rear portion includes a display surface for advertisements and the like, and is formed of a material that reflects incident light from the surface and transmits light from the internal illumination light source. 4. The display device according to claim 1, wherein a phosphorescent material is provided on the reflection portion or the back surface portion.

Images