KR100860298B1 - A luminescent apparatus - Google Patents

Abstract

The present invention improves the structure of the photoluminescent body and emits light by itself with the accumulated light energy at the moment when the light emission of the light source is extinguished, thereby securing sufficient initial luminance and making the afterglow time longer. Is to provide.

The photoluminescent display device which concerns on this invention is a light source which emits light; A light guide plate which induces light emitted from a light source, has a flat plate shape, and has fine irregularities formed on at least one surface thereof; A photoluminescent sheet attached to both surfaces (surface and back surface) of the light guide plate, having a photoluminescent layer made of a photoluminescent paint, and made of a translucent resin film; And a display sheet attached to the photoluminescent sheet, the display sheet of which a character or a figure is displayed and made of a resin film, wherein the photoluminescent sheet attached to a surface on which light irregularities are formed on the light guide plate is a main photoluminescent sheet. The main photoluminescent sheet is characterized by containing more photoluminescent pigment than the photoluminescent sheet attached to the other side.

Photoluminescent body, afterglow, light guide plate, photoluminescent sheet

Description

Photoluminescent Display {A luminescent apparatus}

1 is a longitudinal sectional view showing a configuration of a first embodiment of a photoluminescent display device according to the present invention.

2 is a longitudinal sectional view showing a configuration of a second embodiment of a photoluminescent display device according to the present invention.

3 is a longitudinal sectional view showing a configuration of a third embodiment of a photoluminescent display device according to the present invention.

4 is a longitudinal sectional view showing a configuration of a fourth embodiment of a photoluminescent display device according to the present invention.

5 is a partially enlarged cross-sectional view of the phosphor.

*** Explanation of symbols for main parts of drawing ***

11, 21, 31, 41: photoluminescent display

12, 22, 32, 42: display sheet

13, 16, 33, 43: photoluminescent sheet

14, 24, 34, 44: light guide plate

15, 25, 35, 45: main photoluminescent sheet

17, 27, 37, 47: light source

100: photoluminescent body

104: substrate

107 photoluminescent paint

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a photoluminescent display device, and more particularly, absorbs light energy emitted from a lighting device by the sun or electricity, and then emits light by itself when the light source is extinguished, thereby generating sufficient initial luminance. It relates to a photoluminescent display device which can be secured and the afterglow time can be made longer.

In general, a photoluminescent display device must have a high initial luminance and a long afterglow time. In other words, when the light source is extinguished and suddenly dark, it is necessary to be able to check the surrounding objects and to have such a long time to check the objects.

Such a luminescent display device usually absorbs and accumulates the light energy of solar light or an electric light source and emits the accumulated light when the light is blocked, such as at night or power failure, to identify and confirm an evacuation or emergency exit. In order to facilitate this, in particular, the trend is widely spread to guide plates such as evacuation induction lamps. Such conventional photoluminescent display devices have only a problem of evacuation (emergency) induction lamps because they have a high brightness and a short afterglow time. It could not be used, and it could not be used as a billboard.

In the photoluminescence of the display device using the photoluminescent light, the larger the amount of the photoluminescent material, the brighter the light is emitted, and the stronger the light is emitted when the strong light is emitted from the photoluminescent material, and the light emission time and the afterglow luminance of the photoluminescent material are as much as possible. Long and large are preferable, but in order to increase them, the amount of photoluminescent material must be increased.

However, in order to increase the amount of photoluminescent material, the coating film formed by applying a photoluminescent pigment incorporating the photoluminescent material should be thickened. However, when the coating material is thickly applied, light incident to the deep part of the coating film is insufficient. The phosphorescent material at the core cannot be excited, and as a result, the luminance as much as expected and the afterglow time cannot be lengthened. That is, in the conventional photoluminescent display device, it is difficult to obtain the effect as expected in light emission luminance and afterglow time only by increasing the thickness of the coating film of the photoluminescent paint.

In addition, the method of using the photoluminescent material in the photoluminescent display device so far can be summarized in four ways,

First, a method of making a molded article by mixing a phosphorescent material with a resin. Since the phosphorescent material is a ceramic particle, it is difficult to mold when it is mixed with a resin and exceeds a certain mixing ratio. Therefore, there is a problem that the manufacturing machine is likely to be damaged.

Second, a method of making a print by mixing the phosphorescent material with ink is not only more difficult than mixing the phosphorescent material with the ink, but also because it is almost impossible to overprint, and the plate of the phosphorescent material is hard to print. There is a problem that there is a lot of possibility to hurt.

Third, there is a method of mixing and coating the photoluminescent material in the paint, there is a problem that if the mixing of more than a certain photoluminescent material is not only good adhesion but also can not be applied or sprayed.

Fourth, the method of mixing a photoluminescent material with baking products, such as glass and a pottery, has a problem that a photoluminescent material cannot tolerate high temperature and it does not emit light, and there exists a problem that the photoluminescent material which can endure temperature is limited.

As described above, the conventional photoluminescent display device has various problems in increasing the initial luminance and the long afterglow time.

The present invention has been made to solve the problems of the prior art as described above, and an object of the present invention is to improve the structure of the photoluminescent display device and emit light by itself through the accumulated light energy at the moment when the light emission of the light source is extinguished. Therefore, it is an object of the present invention to provide a photoluminescent display device capable of securing sufficient initial luminance and making the afterglow time longer.

In order to achieve the above object, a photoluminescent display device according to the present invention includes a light source for emitting light; A light guide plate which induces light emitted from a light source, has a flat plate shape, and has fine irregularities formed on at least one surface thereof; A photoluminescent sheet attached to both surfaces (surface and back surface) of the light guide plate, having a photoluminescent layer made of a photoluminescent paint, and made of a translucent resin film; And a display sheet attached to the photoluminescent sheet, the display sheet of which a character or a figure is displayed and made of a resin film, wherein the photoluminescent sheet attached to a surface on which light irregularities are formed on the light guide plate is a main photoluminescent sheet. The main photoluminescent sheet is characterized by containing more photoluminescent pigment than the photoluminescent sheet attached to the other side.

Preferably, the photoluminescent layer formed on the photoluminescent sheet may be formed by spraying a surface of the photoluminescent sheet by spraying, silk screen printing, or molten resin on the surface, back or both surfaces of the photoluminescent sheet. It is a plate material which mixed and hardened the photoluminescent material.

Preferably, the photoluminescent sheet is a photoluminescent body formed by applying a photoluminescent paint mixed with a transparent resin material and a fine powder photoluminescent material on a surface on which a plurality of projections are formed.

Hereinafter, the photoluminescent display device according to the present invention will be described with reference to FIGS. 1 to 5.

1 to 4 are longitudinal cross-sectional views showing the configuration of various embodiments of the photoluminescent display device according to the present invention, and FIG. 5 is a partially enlarged cross-sectional view of the photoluminescent body.

1 shows a first embodiment of a photoluminescent display device according to the present invention, wherein the photoluminescent display device 11 includes: a light source 17 for emitting light; A light guide plate (14) which guides light emitted from the light source (17), has a flat plate shape, and has fine irregularities formed on at least one surface thereof; Photoluminescent sheets 13 and 15 attached to both surfaces (surface and back surface) of the light guide plate 14 and having a photoluminescent layer made of a photoluminescent paint, and made of a translucent resin film; And a display sheet 12 attached to the photoluminescent sheet 13 and displaying characters or figures and made of a resin film. Reference numeral 18 denotes a frame which serves as a holder of the light source 17 and maintains a stacked state of each component of the photoluminescent display.

The light guide plate 14 for inducing light emitted from the light source is made of, for example, a flat plate formed of a transparent acrylic resin material, and has one or both surfaces of the light guide plate 14 having a fine concavo-convex shape for diffusely diffused reflection of light. The outer surface of the light guide plate 14 is formed by a rough surface formed with projections (in the first, third and fourth embodiments, the projections are formed on only one surface, and in the second embodiment, the projections are formed on both surfaces). The light of the light source 17 incident from the peripheral edges is diffusely diffused and reflected inside the light guide plate 14 to increase the brightness of the surface of the light guide plate 14, and the protrusions are distributed at equal intervals over the entire surface where the protrusions are formed to emit light. The luminance distribution of the surface can be made uniform.

By arranging the photoluminescent sheet 13 and the main photoluminescent sheet 15 using the photoluminescent pigment on both surfaces of the light guide plate 14, when the light source emits light, the photoluminescent surface can be used as the reflecting surface. It is possible to increase the amount of light that accumulates therein to sufficiently give excitation energy to the photoluminescent material, so that the light emitted from the translucent photoluminescent sheet 13 on the surface and the main photoluminescent sheet 15 on the back surface emit light. The light emitted toward the surface through the photoluminescent sheet 13 of each other, the brightness is greatly increased and the afterglow time is also long.

The display sheet 12, for example, printed letters, marks, graphics, etc. on a transparent resin film, commercial, such as billboards installed indoors and outdoors, as well as non-commercial such as emergency exit signs, evacuation guidance lights, guide signs, etc. Since it can also be used as a structure, it is comprised so that replacement is possible according to a use.

In Fig. 1, the photoluminescent sheet is attached to the surface side and the back side in addition to the main photoluminescent sheet 15, but the rear side photoluminescent sheet 16 may be attached. 13) and the back side photoluminescent sheet 16 are preferably basically the same, and the photoluminescent layer formed on the photoluminescent sheets 13 and 16 is formed of a transparent resin film containing a photoluminescent material mixed with a photoluminescent material of fine powder. It is a thin plate material which is applied by spraying or silk screen printing on the surface side, the back side, or both surfaces, or is cured by mixing a photoluminescent material with a molten resin material.

When spraying the photoluminescent paint on the photoluminescent layer formed on the photoluminescent sheet, the resin material flows down once thickly, and the surface of the photoluminescent paint is smoothed so that the surface area does not increase. Since it can adhere to the whole surface as a crystalline phase, many fine unevenness | corrugation is formed by the photoluminescent material powder on the surface of a photoluminescent sheet, and it is much more effective in enlarging the effective area for photoluminescence. In addition, the photoluminescent powder is more preferable to increase the brightness of the spherical surface with many irregularities formed on the surface than the spherical powder having a smooth surface.

The photoluminescent sheets 13 and 16 exhibit white color under visible light so as to reflect a part of the light emitted from the surface and the back surface of the light guide plate 14 and return it back to the light guide plate 14, and white upon excitation. It is preferable to apply the photoluminescent pigment which shows the light emission color approximated to, and to make it translucent which can ensure a certain light transmittance, it is preferable to apply the pigment amount to 300 g / m <2> or less.

In particular, the surface-side photoluminescent sheet 13 exhibits white color under visible light and has a high light transmittance to some extent, thereby preventing color development of the display sheet 12 when the light source 17 is turned on. In addition, a clear and clear display can be realized.

The main photoluminescent sheet 15 is basically the same as the above-mentioned surface side and back side photoluminescent sheets 13 and 16. The photoluminescent layer formed on the main photoluminescent sheet 15 is made of a transparent resin material and a photoluminescent material of fine powder. Sprayed onto the surface side, back side, or both sides of the transparent resin film or resin plate based on the photoluminescent paint mixed with a coating or applied by silkscreen printing, or by mixing the photoluminescent material with the molten resin material It is a hardened plate.

The main photoluminescent sheet 15 is attached to the surface on which the minute unevenness is formed in the light guide plate 14, and the emission color of the main photoluminescent sheet 15 can be appropriately selected from commercially available photoluminescent materials such as green, yellow or yellow green. When the photoluminescent pigments of different luminous colors are applied to both surfaces of the main photoluminescent sheet 15, the effect of color emission due to color mixing can be maximized, and the photoluminescent pigments used for the main photoluminescent sheet 15 can be utilized. The amount is suitably 700 to 800 g / m 2. More phosphorescent pigments have many problems when spraying, silk printing or mixing with resin.

Thus, by disposing the translucent white photoluminescent sheets 13 and 16 on each surface of the light guide plate 14, the light emitted from the light source 17 between the photoluminescent sheets 13 and 16 on the front and back sides is emitted. By reflecting each other, it is possible to exert an effect as if a part of light is confined in the light guide plate 14. Therefore, the phosphorescent material of the main photoluminescent sheet 15 can be excited as much as possible, and light energy can be accumulated to greatly contribute to high luminance and long afterglow time when the light source 17 is turned off. Further, by emitting white light on the surface-side photoluminescent sheet 13, color development of the main photoluminescent sheet 15 can be made more clear.

2 is a second embodiment of a photoluminescent display device according to the present invention. In the photoluminescent display device 21, the light guide plate 24 having fine projections on both surfaces thereof is disposed at the center, and main photoluminescent sheets 25a and 25b are attached to each side of the light guide plate 24, respectively. The display sheets 22a and 22b are attached to the outer surfaces of the photoluminescent sheets 25a and 25b, respectively. The light source 27 is disposed at the outer peripheral edge of the light guide plate 24 in the same manner as in the first embodiment.

In the second embodiment, the photoluminescent display device is configured to display characters, figures, and the like on both sides, and therefore, it is suitable for guide signs, billboards, and the like, which are installed so as to be seen from both sides in the middle of the passage.

3 is a third embodiment of a photoluminescent display device according to the present invention. In the photoluminescent display device 31, the main photoluminescent sheet 35 is disposed at the center, and the light guide plates 34a and 34b are disposed on each surface of the main photoluminescent sheet 35, respectively. On each outer surface, the phosphorescent sheets 33a and 33b and the display sheets 32a and 32b are arranged in order. In this case, it is preferable to arrange the light sources 37a and 37b at the outer peripheral edges of each of the two light guide plates 34a and 34b, and on the surface facing the main photoluminescent sheet 35 of each of the light guide plates 34a and 34b. It is preferable to form fine protrusions for diffuse diffuse reflection.

4 is a fourth embodiment of a photoluminescent display according to the present invention. In the photoluminescent display device 41, the display sheet 42 is placed at the center, and the main photoluminescent sheets 45a and 45b, the light guide plates 44a and 44b, and the semi-transmissive semi-reflective photoluminescent sheets 43a and 43b are sequentially formed. Each surface of the display sheet 42 is attached. Also in this case, as in the third embodiment, the light sources 47a and 47b are disposed at the outer peripheral edges of the two light guide plates 44a and 44b, respectively, and the main photoluminescent sheets 45a and 45b of the light guide plates 44a and 44b are disposed. It is preferable to form a fine projection for diffuse diffuse reflection on the surface facing.

In each embodiment, it is preferable to use a high-brightness LED as the light source, but not limited to the LED, the same applies to the EL, cold cathode tube or fluorescent light close to the white light, considering the time required for photoluminescence and photoluminescence efficiency. Therefore, the light source may be disposed at each outer peripheral edge of each light guide plate, and the light source may be disposed at one side or both sides of the outer periphery of each light guide plate. desirable. Further, the frame is not limited to maintain the laminated state of components such as a light guide plate and a photoluminescent sheet, but may be integrally bonded to each other using an adhesive.

In addition, by attaching a timer separately to the photoluminescent display device according to the present invention, after the light source is turned on for a predetermined time, the light is turned off for a predetermined time and the light energy stored therein is utilized, thereby saving power and saving energy.

The photoluminescent display device according to the present invention has a function of continuing to display by self-luminous when lighting is turned off due to a power failure, an accident, etc., and is very useful as an indoor and outdoor signage for advertisement or a guide sign for a building or an underground passage. It can be useful.

FIG. 5 is a partially enlarged cross-sectional view of the phosphor, and in order to increase the initial luminance and increase the afterglow time of the phosphor, it is difficult to sufficiently increase the effect as expected by increasing the thickness of the coating film. Therefore, the structure of the phosphor is improved. Specifically, in the above embodiment, instead of the main photoluminescent sheets 15, 25, 35, and 45, the photoluminescent body 100 having the improved structure may be used.

The concrete structure of the photoluminescent body includes a substrate 104 in which a plurality of projections 103 are formed at equal intervals on a flat plate 102 made of a photoresist, and the substrate 104. It is formed by applying the photoluminescent paint 107 mixed with a transparent resin material 105 and a fine powder photoluminescent material 106 on the surface.

The protrusion 103 shows a pillar shape regularly placed on the substrate 104, but the protrusion shape may be modified into various shapes such as a hook shape or a mushroom shape. In addition, since the resin material 105 flows down when the photoluminescent paint 107 is thickly applied at one time, the coated surface of the photoluminescent paint 107 is not smoothed and the surface area is not increased. Can be attached to the surface of the projection 103 in a crystal phase, and is effective in enlarging an area effective for photoluminescence.

The above description is merely illustrative of the technical idea of the present invention, and those skilled in the art to which the present invention pertains may make various modifications and changes without departing from the essential characteristics of the present invention. Therefore, the embodiments disclosed in the present invention are not intended to limit the technical idea of the present invention but to describe the present invention, and the scope of the technical idea of the present invention is not limited by these embodiments. The protection scope of the present invention should be interpreted by the following claims, and all technical ideas within the equivalent scope should be interpreted as being included in the scope of the present invention.

As described above, the photoluminescent display device according to the present invention can further increase the initial luminance after the disappearance of the electric light, and further increase the afterglow time, and attach a timer to turn on and off the light. It can be usefully used for guidance display boards, induction display boards and advertisement boards by saving energy by maximizing the photoluminescence by repeating periodically.

Claims (13)

A light source that emits light; A light guide plate which induces light emitted from the light source, has a flat plate shape, and has fine irregularities formed on at least one surface thereof; A photoluminescent sheet attached to both surfaces (surface and back surface) of the light guide plate, the photoluminescent sheet having a photoluminescent layer made of a photoluminescent paint, and made of a translucent resin film; A display sheet attached to the photoluminescent sheet and displaying characters or figures and made of a resin film; The photoluminescent sheet includes a photoluminescent sheet, wherein the photoluminescent sheet is attached to a surface on which light unevenness is formed on the light guide plate, and the main photoluminescent sheet includes more photoluminescent pigments than the photoluminescent sheet attached to another surface. A photoluminescent display, characterized in that it contains. delete The method of claim 1, The minute projections formed on the light guide plate are distributed at equal intervals over the entire surface on which the projections are formed. The method of claim 1, The photoluminescent display device of claim 1, wherein the photoluminescent layer formed on the photoluminescent sheet is coated with a spraying method by spraying a photoluminescent material mixed with a fine powder photoluminescent material on a transparent resin material to the surface, the back side, or both sides of the photoluminescent sheet. The method of claim 1, The photoluminescent layer formed on the photoluminescent sheet is a photoluminescent display device characterized in that the photoluminescent coating material is mixed with a transparent resin material on the surface, the back or both sides of the transparent resin film by a silk screen printing method. The method of claim 1, And the photoluminescent sheet is a plate material obtained by mixing and curing the photoluminescent material with the molten resin material. The method of claim 1, The surface of the photoluminescent layer formed on the photoluminescent sheet has a fine unevenness formed by the photoluminescent material powder. The method of claim 1, And the light source is any one of an EL, an LED, a cold cathode tube, and a fluorescent lamp. The method of claim 1, And the light source and the light guide plate are adjacent to each other, and the light source is disposed on one side or both sides of an outer periphery of the light guide plate. The method of claim 9, And two light guide plates. The method of claim 1, And a timer capable of automatically adjusting lighting and turning off of the light source. The method of claim 1, The main photoluminescent sheet is a photoluminescent body formed by applying a photoluminescent paint, which is a mixture of a transparent resin material and a fine powder photoluminescent material, to a substrate on which a plurality of projections are formed on a flat plate. The method of claim 12, The plurality of projections formed on the photoluminescent body are arranged to be distributed at equal intervals over the entire surface on which the projections are formed.

Images