JP2015041087A - Display panel using light accumulation sheet, guide display device, and illumination device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a display panel that suppresses display from exhibiting a cream-like hue, achieves display with high designability, and can efficiently derive light from a light source and accumulate the light during normal light emission and can efficiently derive the accumulated light in a light accumulation layer during dark hours of the day.SOLUTION: A display panel of the present invention includes a light source 11 that emits light, a light guide plate 7 that is adjacent to the light source 11 to emit the light from the light source 11, and a light accumulation sheet 6 that receives and accumulates the light from the light guide plate 7 and derives the accumulated light, where the light accumulation sheet 6 includes a light accumulation layer 4, and a semi-transmissive reflection layer 5 that guides the light from the light guide plate 7 to the light accumulation layer 4 and derives the light accumulated in the light accumulation layer 4 to the light guide plate 7 side.

Description

  The present invention includes at least a phosphorescent sheet and a light guide plate. In a normal state, the light from the light source is derived from the display surface via the light guide plate. The present invention relates to a display panel, a guidance display device, and a lighting device that are configured to perform the above.

  Conventionally, road signs and various kinds of guide signs are required to accurately display guidance even during darkness such as at night. Furthermore, it is required that information on a display unit such as a mobile phone or a clock can be accurately read even during darkness such as at night. In such a case, a phosphorescent sheet is employed as a backlight functioning to support various displays using the above-described signs, cellular phones, watches, etc. at night.

  For example, Patent Document 1 discloses a guide lamp display panel in which a pattern is formed of a non-luminous ink on the surface of a substrate and a white luminous layer is formed in a state of covering the pattern. In this technique, the phosphorescent layer has translucency, so that the visibility is not hindered, and plays the role of a light after it is turned off.

  And in patent document 2, especially in the backlight apparatus of the display apparatus in a portable terminal device, the light emission by the light source lamp and the light emission by the phosphorescent material are used, and the portable device can be viewed with sufficient brightness without turning on the light source lamp. A terminal device is disclosed.

  Furthermore, in Patent Document 3, in a phosphorescent dial for a watch formed by sticking a phosphorescent sheet on a dial substrate via an adhesive, the phosphorescent sheet has a single translucent color coating on the upper surface of the phosphorescent, A timepiece dial having light emission is disclosed.

  Moreover, in patent document 4, the light emission display surface formed with the phosphorescence paint or the phosphorescence film is formed in the surface of a base material sheet, and a normal display surface is on the surface of the translucent sheet | seat laminated | stacked on the base material sheet. A technique is disclosed in which the display is switched to a light-emitting display surface when the surrounding is darkened.

  However, none of the techniques disclosed in Patent Documents 1 to 4 use a light guide plate. During normal light emission, light from a light source is derived through the light guide plate and light is stored in a light storage layer. Sometimes the light of the phosphorescent layer is not derived through the light guide plate.

  Here, the following is used as the light guide plate.

  That is, in Patent Document 5, the light guide plate in which the phosphorescent layer is formed inside or outside is provided with a display unit having no phosphorescent function, and the adhesive layer is interposed on the side where the display unit of the phosphorescent layer is not provided. Thus, there is disclosed a sign provided with a reflective layer in which a white film is laminated.

  In Patent Document 6, a surface-emitting display device having a light source that emits light electrically and a light guide plate that guides light emitted from the light source, the semi-transparent property is provided at a position facing each front and back surfaces of the light guide plate. There is disclosed a surface light emitting display device in which a phosphorescent sheet having a phosphorescent layer with a phosphorescent pigment having a white or approximate white color below visible light is disposed.

  In addition, as a phosphorescent phosphor and fluorescent substance having a long afterglow time used for the phosphorescent sheet, for example, there are those disclosed in Patent Documents 7 to 9.

JP 2007-18337 A Japanese Patent No. 4282651 Utility Model Registration No. 2575306 JP 2004-163621 A Japanese Patent No. 4094410 JP 2008-122798 A Japanese Patent No. 2543825 Japanese Patent No. 2697688 Japanese Patent No. 469955

  However, in the technology provided with the light guide plate and the phosphorescent layer disclosed in Patent Documents 5 and 6, since the phosphorescent layer is exposed, the display has a creamy color. Therefore, it is unsuitable for application to a display panel or the like where designability is regarded as important, and the usage is naturally limited to a specific region.

  Therefore, the present invention has been made in view of such a situation, suppresses a display with a creamy color, realizes a highly designed display, and efficiently emits light from a light source during normal light emission. An object of the present invention is to provide a display panel, a guidance display device, and a lighting device that can be derived and can store light, and can efficiently store the light stored in the light storage layer when dark.

  In order to solve the above technical problem, a display panel according to an aspect of the present invention includes a light source that emits light, a light guide plate that is adjacent to the light source and emits light of the light source, and light of the light guide plate. And a phosphorescent sheet for deriving the stored light, the phosphorescent sheet guiding the light of the light guide plate to the phosphorescent layer and the phosphorescent layer and guiding the light stored in the phosphorescent layer. It has a semi-transmissive reflective layer led out to the optical plate side.

  A guidance display device according to another aspect of the present invention includes: a light source that emits light; a light guide plate that is adjacent to the light source and emits light from the light source; A phosphorescent sheet to be derived; and a light source, the light guide plate, and a housing portion that holds at least the phosphorescent sheet. The phosphorescent sheet guides light of the light guide plate to the phosphorescent layer and the phosphorescent layer and And a semi-transmissive reflective layer that guides the light stored in the layer to the light guide plate side.

  An illumination device according to still another aspect of the present invention is an illumination device using a light guide plate, a light source that emits light, a light guide plate that is adjacent to the light source and emits light of the light source, and the light guide plate A phosphorescent sheet for receiving and storing the light and deriving the stored light, wherein the phosphorescent sheet guides the light of the light guide plate to the phosphorescent layer and the phosphorescent layer and stores the light stored in the phosphorescent layer. It has a semi-transmissive reflective layer led out to the light guide plate side.

  According to the present invention, a display with a creamy color is suppressed, a highly designable display is realized, the light of the light source can be efficiently derived at the time of normal light emission, and the light can be stored, and at the time of darkness It is possible to provide a display panel, a guidance display device, and a lighting device that can efficiently derive the light storage of the light storage layer.

  Further, one side of the light guide plate serves as a design sheet mounting surface on which a design sheet is mounted, and the phosphorescent sheet is disposed on the other side of the light guide plate, and the semi-transmissive reflective layer toward the design sheet mounting surface side. By arranging the side, it is possible to suppress a display having a creamy color even when visually recognized through the design sheet, and to realize a display having a high design property.

  In addition, a reflection sheet is provided on the side of the phosphorescent sheet opposite to the surface on which the light guide plate is disposed, so that the light from the light source that has passed through the light guide plate or the light from the phosphorescent sheet is transmitted during normal light emission and darkness. It is possible to provide a display panel, a guidance display device, and an illumination device that have an effect of increasing luminance.

  The light guide plate has a plurality of concave portions or convex portions formed on at least one main surface thereof, and thereby efficiently guides light to the phosphorescent sheet side or the opposite design sheet side, etc. A guidance display device and a lighting device can be provided.

  In addition, by laminating a plurality of the phosphorescent sheets, it is possible to provide a display panel, a guidance display device, and an illumination device that further increase the phosphorescent efficiency and the luminous efficiency and suppress the display of a creamy color. .

  Further, the milk half plate, the design sheet, and the transparent acrylic plate are sequentially laminated on the side of the light guide plate opposite to the position where the phosphorescent sheet is disposed, so that the milk half plate or the design sheet is the light guide plate. It is possible to provide a display panel, a guide display device, and an illumination device that can suppress unevenness generated from the degree of light and darkness generated by the uneven arrangement.

  The light guide plate has a plurality of concave portions or convex portions formed on one main surface and the other main surface, and the concave portion or convex portion on the one main surface side is the concave portion or convex portion on the other main surface side. In addition, it is possible to provide a display panel, a guide display device, and an illumination device that can suppress unevenness generated from the degree of light and darkness generated by the uneven arrangement of the light guide plate by being shifted by a predetermined pitch.

  In addition, the light guide plate and the phosphorescent sheet are provided on the front side and the back side, respectively, with the reflective sheet in between, and by displaying different information on the front and back sides, the display on the opposite side is not reflected It is possible to provide a display panel and a guidance display device that display information corresponding to needs.

1 is a configuration diagram of a display panel according to a first embodiment of the present invention. It is a figure explaining the principle of light storage and light emission of the display panel which concerns on the 1st Embodiment of this invention. 1 is an external view of a display panel according to a first embodiment of the present invention. It is a block diagram of the signboard which concerns on the 2nd Embodiment of this invention. (A) And (b) is an external view (surface) of the guidance display apparatus which concerns on the 2nd Embodiment of this invention. It is a disassembled perspective view of the guidance display apparatus which concerns on the 2nd Embodiment of this invention. It is side surface sectional drawing of the guidance display apparatus which concerns on the 2nd Embodiment of this invention. It is a conceptual diagram explaining the formation pattern of a reflective dot.

  DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, preferred embodiments according to a display panel and a guidance display device of the invention will be described with reference to the drawings. The display panel and the guidance display device of the present invention are not limited to the following description, and can be appropriately changed without departing from the gist of the present invention.

<First Embodiment>
First, a first embodiment of the present invention will be described.

  FIG. 1 shows and describes the configuration of a display panel according to a first embodiment of the present invention.

  As shown in FIG. 1, the display panel 1 according to this embodiment includes an LED as a light source 11. And the light-guide plate 7 is arrange | positioned so that the incident light from LED as this light source 11 may be received from a side surface. The light guide plate 7 is made of, for example, a transparent acrylic resin. In this example, LEDs serving as the light source 11 are provided in two places on the upper and lower sides so as to receive incident light from both upper and lower side surfaces of the light guide plate 7, but only one side may be provided.

  A phosphorescent sheet 6 is disposed so as to face one main surface of the light guide plate 7, and a reflective sheet 2 is disposed on the rear surface of the phosphorescent sheet 6. The phosphorescent sheet 6 has a laminated structure in which a semi-transmissive reflective layer 5, a phosphorescent layer 4, and a PET layer 3 as a transparent support are laminated from the light guide plate 7 side.

  That is, the phosphorescent sheet 6 is formed by laminating a phosphorescent layer 4 in which a fine phosphorescent pigment is mixed with an acrylic resin material on the surface of the PET layer 3 serving as a transparent support, and further translucent reflection on the phosphorescent layer 4. The layer 5 is laminated. And the reflection sheet 2 is comprised by laminating | stacking a white acrylic resin film etc. on the base-material surface, for example. However, it is not limited to this.

That is, the transparent support may be a PET film, or other materials such as acrylic or PC as long as it is transparent. In addition, for the phosphorescent layer 4, in this first embodiment, a phosphorescent pigment made of strontium aluminate is adopted, but the present invention is not limited to this, and supports such as ZnS, binder resin, acrylic, PVC, polyester, etc. The pigment layer can be selected as appropriate as long as it adheres to the surface and forms a pigment layer. Further, a phosphorescent pigment obtained by adding a rare earth element as an activator (activator) to strontium aluminate can also be employed. Further, when ZnS (zinc sulfide) is a main component, for example, Cu as a metal may be included as an additive. Furthermore, as the semi-transmissive reflective layer 5, TiO ₂ as a white pigment is adopted, but the present invention is not limited thereto, and BaSO ₄ , MgO, ZrO, Talc, Al ₂ O ₃ , PMMA, PE, PP as white pigments are used. As long as a pigment layer such as a binder resin, acrylic, PVC, or polyester can be formed, it can be selected as appropriate. In this example, although it was set as the structure provided with PET layer 3 used as a transparent support body, of course, it is good also as a structure which is not provided with a transparent support body.

  Here, an example in which the phosphorescent sheet 6 is disposed so as to be in surface contact with the reflective sheet 2 is shown, but the phosphorescent sheet 6 further includes an adhesive layer, and the reflective sheet 2 or the guide is provided by the adhesive layer. You may make it affix on the optical plate 7. FIG.

  In this case, the size of each layer of the phosphorescent sheet 6 can be 38 μm for the PET layer 3, 220 to 230 μm for the phosphorescent layer 4, 10 to 25 μm for the adhesive layer, and 160 to 165 μm for the release paper. Further, when only the semi-transmissive reflective layer 5 is taken out, the thickness can be several tens of μm. However, it is not limited to this.

  On the other hand, a milk half plate 8, a design sheet 9, and a transparent acrylic plate 10 are sequentially disposed on the surface of the light guide plate 7 opposite to the position where the phosphorescent sheet 6 is disposed. The milk half plate 8 is for efficiently diffusing light derived from the light guide plate 7. For example, a poster or the like corresponds to the design sheet 9. The transparent acrylic plate 10 serves as a fixing member for sandwiching the design sheet 9 with the milk half plate 8.

  In such a configuration, when the power is supplied, the LED as the light source 11 emits light, and the light is led out through the light guide plate 7 and diffused by the milk half plate 8 to illuminate the design sheet 9 such as a poster. At the same time, the light from the light source 11 is also guided to the phosphorescent sheet 6 through the light guide plate 7, and the phosphorescent layer 4 of the phosphorescent sheet 6 stores light energy. On the other hand, when there is no power supply, the light emitted from the phosphorescent layer 4 of the phosphorescent sheet 6 is guided to the milk half plate 8 through the light guide plate 7 and diffused by the milk half plate 8 to illuminate the design sheet 9 such as a poster. Will be.

  One of the features of the display panel according to the present embodiment is that the phosphorescent sheet 6 has a semi-transmissive reflective layer 5. The semi-transmissive reflective layer 5 can transmit the incident light from the LED as the light source 11 through the light guide plate 7 and the light emission of the phosphorescent layer 4 of the phosphorescent sheet 6. Accordingly, during normal times, display by LEDs and display by a phosphorescent light source at the time of darkness are possible, and therefore, it can be developed in areas such as the sign industry where importance is placed on designability and areas in which safety is ensured during darkness.

  Here, with reference to FIG. 2, the basic principle of the semi-transmissive reflective layer employed in the display panel according to the present embodiment will be described in more detail.

  In normal times, the semi-transmissive reflective layer 5 reflects the light supplied from the light guide plate 7 and contributes to not expressing the cream color peculiar to the phosphorescent pigment on the design surface. At the same time, the semi-transmissive reflective layer 5 transmits part of the light from the light guide plate 7 and supplies it to the phosphorescent layer 4. Thereby, the phosphorescence by the luminous layer 4 is made.

  On the other hand, when there is no power supply, the semi-transmissive reflective layer 5 transmits light to the light guide plate 7, the milk half plate 8, and eventually the design sheet 9 side without disturbing the light emission of the light storage layer 4 of the light storage sheet 6. The reflection sheet 2 disposed on the back side of the phosphorescent sheet 6 reflects light emitted from the phosphorescent layer 4 of the phosphorescent sheet 6 and transmits the semi-transmissive reflective layer 5, thereby guiding the light guide plate 7 and the milk half plate. 8. As a result, light can be delivered to the design sheet 9 side. In addition, the reflectance of the surface which touches the phosphorescent sheet 6 of the reflective sheet 2 may be larger than the reflectance of the semi-transmissive reflective layer 5 of the phosphorescent sheet 6.

  In the above description, an example in which a single phosphorescent sheet is used has been described, but it goes without saying that a plurality of phosphorescent sheets may be stacked to increase luminous efficiency.

  Next, FIG. 3 shows an external configuration diagram of the display panel 1 according to the present embodiment.

  As shown in FIG. 3, in the display panel 1 according to this embodiment, the reflection sheet 2, the phosphorescent sheet 6, the light guide plate 7, the milk half plate 8, the design sheet 9, and the transparent acrylic plate 10 as described above with reference to FIG. 1. The laminated structure consisting of is held with the aluminum frame 12 sandwiching the four sides. At this time, the LED as the light source 11 is also stored in the upper and lower aluminum frames 12. However, the sandwiching frame is not limited to the aluminum frame 12, and various materials can be employed.

  As described above, as the first embodiment of the present invention, the LED as the light source 11 that emits light, the light guide plate 7 that is adjacent to the light source 11 and emits the light of the light source, and the light of the light guide plate 7 are received. And a phosphorescent sheet 6 for deriving and storing the phosphorescent light. The phosphorescent sheet 6 guides the light stored in the phosphorescent layer 4 while guiding the light of the light guide plate 7 to the phosphorescent layer 4 and the phosphorescent layer 4. A display panel 1 having a semi-transmissive reflective layer 5 led out to the light plate 7 side is provided. According to this, even during darkness, display can be performed with the light stored in the light storage layer 4.

  In the display panel 1, the reflection sheet 2 may be provided on the opposite side of the light storage sheet 6 from the surface on which the light guide plate 7 is disposed. Furthermore, the reflectance of the semi-transmissive reflective layer 5 may be lower than the reflectance of the reflective sheet 2. According to this, the semi-transmissive reflective layer 5 can transmit light from the light source and guide it to the light storage layer, and can also preferably transmit light from the light storage layer to the light guide plate 7. .

  The light guide plate 7 may have a plurality of concave portions or convex portions formed on at least one main surface thereof. According to this, the diffusion of light by the light guide plate 7 is suitably performed. A plurality of phosphorescent sheets 6 may be laminated. According to this, luminous efficiency can be increased and the amount of emitted light can be increased. And it is good also as the milk half board 8, the design sheet 9, and the transparent acrylic board 10 laminated | stacked in order on the opposite side to the arrangement | positioning position of the light storage sheet 6 of the light-guide plate 7. FIG. According to this, the design sheet can be suitably illuminated by the light of the light source or the light stored in the light storage layer.

  Therefore, according to the display panel according to the first embodiment, a display with a creamy color is suppressed, a display with a high design property is realized, and light of the light source is efficiently derived during normal light emission. In addition to being able to store light, the light stored in the light storage layer can be efficiently derived during darkness.

  The display panel according to the first embodiment is mounted on a floor surface, a wall surface, or a ceiling surface as a configuration without the design sheet 9 and the transparent acrylic plate 10 or without the milk half plate 8, It can also be set as the illuminating device which implement | achieves a light floor and a light ceiling. Also in this case, suitable light emission can be continued not only during normal light emission but also during darkness.

<Second Embodiment>
Next, a second embodiment of the present invention will be described.

  FIG. 4 shows a configuration of a guidance display device according to the second embodiment of the present invention.

  As shown in FIG. 4, the guidance display device 20 according to this embodiment can display guidance on both the front and back sides. In addition, since it is a symmetrical structure fundamentally, in FIG. 4, the same code | symbol is used for the same member.

  The guidance display device 20 includes an LED as the light source 29. And the light guide plate 26 is arrange | positioned so that the incident light from LED as this light source 29 may be received from a side surface. The light guide plate 26 is made of, for example, a transparent acrylic resin. In this example, the LED as the light source 29 is provided at one upper portion so as to receive incident light from the upper side surface of the light guide plate 26, but the arrangement position of the light source 29 is not limited to this.

  And the phosphorescent sheet 25 is arrange | positioned in the inner side position so as to oppose one main surface of each light-guide plate 26, and the reflective sheet 21 is arrange | positioned at the rear surface of the said phosphorescent sheet 25. FIG. In this example, an example in which one reflection sheet 21 is also used in the left and right configurations is shown, but two may be stacked. A configuration in which the reflection sheet 21 is not laminated can also be realized. The phosphorescent sheet 25 has a laminated structure in which a semi-transmissive reflective layer 24, a phosphorescent layer 23, and a PET layer 22 are laminated from the light guide plate 26 side.

  That is, the phosphorescent sheet 25 is formed by laminating a phosphorescent layer 23 in which a fine phosphorescent pigment is kneaded with an acrylic resin material on the surface of a PET layer 22 serving as a transparent support, and further translucent reflection on the phosphorescent layer 23. The layer 24 is laminated. And the reflection sheet 2 is comprised by laminating | stacking a white acrylic resin film etc. on the base-material surface, for example. However, it is not limited to this.

That is, the transparent support may be a PET film, or other materials such as acrylic or PC as long as it is transparent. In addition, for the phosphorescent layer 4, in this first embodiment, a phosphorescent pigment made of strontium aluminate is adopted, but the present invention is not limited to this, and a support such as ZnS, binder resin, acrylic, PVC, polyester, etc. The pigment layer can be selected as appropriate as long as it adheres to the surface and forms a pigment layer. Further, a phosphorescent pigment obtained by adding a rare earth element as an activator (activator) to strontium aluminate can also be employed. Further, when ZnS (zinc sulfide) is a main component, for example, Cu as a metal may be included as an additive. Furthermore, as the semi-transmissive reflective layer 5, TiO ₂ as a white pigment is adopted, but the present invention is not limited thereto, and BaSO ₄ , MgO, ZrO, Talc, Al ₂ O ₃ , PMMA, PE, PP as white pigments are used. As long as a pigment layer such as a binder resin, acrylic, PVC, or polyester can be formed, it can be selected as appropriate. In addition, in this example, although it was set as the structure provided with PET layer 22 used as a transparent support body, of course, it is good also as a structure which is not provided with a transparent support body.

  Here, an example is shown in which the phosphorescent sheet 25 is disposed so as to be in surface contact with the reflective sheet 21, but the phosphorescent sheet 25 further includes an adhesive layer, and the reflective sheet 21 or the guide is provided by the adhesive layer. You may make it affix on the optical board 26. FIG.

  In this case, the size of each layer of the phosphorescent sheet 25 can be 38 μm for the PET layer 22, 220 to 230 μm for the phosphorescent layer 23, 10 to 25 μm for the adhesive layer, and 160 to 165 μm for the release paper. When only the semi-transmissive reflective layer 24 is taken out, the thickness can be several tens of μm. However, it is not limited to this.

  On the other hand, a milk half plate 26 and a design sheet 28 are sequentially disposed on the surface of the light guide plate 26 opposite to the position where the phosphorescent sheet 25 is disposed. The milk half plate 27 is for efficiently diffusing light derived from the light guide plate 26. The design sheet 28 is various guidance display sheets. A laminated body 30 is constituted by the reflection sheet 21, the phosphorescent sheet 25, the light guide plate 26, the milk half plate 27, and the design sheet 28 on both the front and back surfaces.

  In such a configuration, during normal times, the LED as the light source 29 emits light by power supply, the light is led out through the light guide plate 26, diffused in the milk half plate 27, and various guidance displays through the design sheet 28. At the same time, the light from the light source 29 is also guided to the phosphorescent sheet 25 through the light guide plate 26, and the phosphorescent layer 23 of the phosphorescent sheet 25 stores light energy.

  On the other hand, when there is no power supply, the light emitted from the phosphorescent layer 23 of the phosphorescent sheet 25 is guided to the milk half plate 27 via the light guide plate 26, diffused by the milk half plate 27, and various guides via the design sheet 28. Display.

  One of the features of the guidance display device 20 according to the second embodiment is that it has a semi-transmissive reflective layer 24. The semi-transmissive reflective layer 24 can transmit the incident light from the LED as the light source 29 through the light guide plate 26 and the light emission of the light storage layer 23 of the light storage sheet 25. Accordingly, during normal times, display by LEDs and display by a phosphorescent light source at the time of darkness are possible, and therefore, it can be developed in areas such as the sign industry where importance is placed on designability and areas in which safety is ensured during darkness.

  That is, in normal times, the semi-transmissive reflective layer 24 reflects the light supplied from the light guide plate 26 and contributes to not expressing the cream color peculiar to the phosphorescent pigment on the design surface. At the same time, the semi-transmissive reflective layer 24 transmits a part of the light from the light guide plate 26 and supplies it to the phosphorescent layer 23. Thereby, the phosphorescence by the luminous layer 23 is made.

  On the other hand, when there is no power supply, the semi-transmissive reflective layer 24 transmits the light emitted from the phosphorescent layer 23 of the phosphorescent sheet 25, is derived from the light guide plate 26, is diffused by the milk half plate 27, and is derived from the design sheet 28. Let Further, the reflection sheet 21 disposed on the back side (inside) of the phosphorescent sheet 25 reflects light emitted from the phosphorescent layer 23 of the phosphorescent sheet 25, transmits the semi-transmissive reflective layer 24, and guides the light guide plate 26. The light is led out through the milk half plate 27 and eventually through the design sheet 28. Note that the reflectance of the surface of the reflection sheet 21 that contacts the phosphorescent sheet 25 may be greater than the reflectance of the semi-transmissive reflective layer 24 of the phosphorescent sheet 25.

  In the above description, an example in which one phosphorescent sheet is used for one light guide plate is shown, but it is a matter of course that a plurality of phosphorescent sheets may be stacked to increase the amount of emitted light. .

  Here, FIGS. 5 (a) and 5 (b) are external configuration diagrams of the guidance display device 20 according to the second embodiment of the present invention, and both show the state of guidance display on the surface. FIG. 5A shows a state of guidance display when the light is on, and FIG. 5B shows a state of guidance display when the light is off.

  Here, since an example in which the phosphorescent sheet 25 is provided only in the left half region of the display surface is shown, the light of the light source 29 is derived from the light guide plate 26 when diffused, diffused by the milk half plate 27, and derived from the design sheet 28. Although a predetermined guidance display is made over the entire surface (see FIG. 5A), the light of the phosphorescent layer 23 of the phosphorescent sheet 25 is transmitted from the light guide plate 26 only in the left half region where the phosphorescent sheet 25 is provided when the light is turned off. Derived, diffused by the milk half plate 27, derived from the design sheet 28, and a predetermined guidance display is made (see FIG. 5B).

  Next, FIG. 6 shows an exploded perspective view of the guidance display device according to the second embodiment of the present invention, FIG. 7 shows a side sectional view of the guidance display device, and the configuration of each part will be described.

  As shown in FIGS. 6 and 7, the casing 31 is formed in a prismatic shape in which a stainless steel plate is refracted a plurality of times so that the center of the lower part is opened and a space is provided inside. In addition, the first holding member 32 and the second holding member 33 housed in the housing part 31 are formed in a shape that combines a L-shape by bending a stainless plate twice. The fixing member 34 is made of a bolt and a nut, and the sealing lid 35 is made of an aluminum flat plate.

  The stacked body 30 is sandwiched between the first holding member 32 and the second holding member 33. Then, the bolts of the fixing member 34 are arranged in the order of a through hole 33 a formed in the second holding member 33, a through hole 30 a formed in the stacked body 30, and a through hole 32 a formed in the first holding member 32. Insert and fix with nuts. In addition, the bottom surface of the first holding member 32 and the bottom surface of the second holding member 33 are placed inside the housing 31. In addition, the casing 31, the first holding member 32, and the side portions of the second holding member 33 are sealed using the sealing lid 35.

  Here, the light guide plate 26 may be formed with a concave portion or a convex portion in order to realize efficient diffusion from one main surface and the other main surface. As shown in FIG. 5, the concave group may be formed on the light guide plate by, for example, a process divided into two steps.

  That is, after the concave portion is formed by bringing the tip of the ultrasonic processing horn into contact with the light guide plate 26 at the left end (initial position) of the light guide plate 26 (region S1), the ultrasonic processing horn is separated from the light guide plate. When the parallel movement is made and the horn pitch is moved to the right by 1 horn pitch, the tip of the ultrasonic processing horn is brought into contact with the light guide plate 26 again to form a recess group (region S2), and these operations are repeated ( ... Region Sn), the surface of the light guide plate 26 is uniformly formed with the first concave group. Subsequently, the ultrasonic processing horn is moved to a position shifted from the initial position by a 1/2 dot pitch in the right direction and by a 1/2 dot pitch in the downward direction. After the tip is brought into contact with the light guide plate 26 to form a recess group (region SS1), the ultrasonic processing horn is moved away from the light guide plate 26 and then moved in parallel. The tip of the ultrasonic processing horn is brought into contact with the light guide plate 26 to form a recess group (region SS2). By repeating these operations (region SSn), the second surface is uniformly formed on the surface of the light guide plate 26. A recess group is formed. The formed second recess groups do not overlap with the first recess groups, and are formed alternately.

  In addition, a uniform light emission distribution may be obtained by forming the recess so that the depth gradually increases as the distance from the light source 29 of the light guide plate 26 increases.

  As described above, as the second embodiment of the present invention, the LED as the light source 29 that emits light, the light guide plate 26 that is adjacent to the light source 29 and emits the light of the light source 29, and the light of the light guide plate 26 are used. The phosphorescent sheet 25 that receives and accumulates light and derives the accumulated light, and the light source 29, the light guide plate 26, and the housing portion 31 that holds at least the phosphorescent sheet 25. The phosphorescent sheet 25 includes the phosphorescent layer 23 and the phosphorescent layer. And a semi-transmissive reflective layer 24 for guiding the light of the light guide plate 26 to the light guide plate 26 and leading the light stored in the light storage layer 23 to the light guide plate 26 side. The Therefore, guidance display can be performed day and night by the light stored in the light source or the phosphorescent sheet.

  Here, the reflection sheet 21 may be provided on the side of the phosphorescent sheet 25 opposite to the surface on which the light guide plate 26 is disposed. Furthermore, the reflectance of the semi-transmissive reflective layer 24 may be lower than the reflectance of the reflective sheet 21. According to this, the light from the light source can be efficiently guided to the phosphorescent sheet, and the luminous efficiency can be increased.

  Furthermore, the light guide plate 26 may have a plurality of concave portions or convex portions formed on at least one main surface thereof. The light guide plate 26 has a plurality of concave portions or convex portions formed on one main surface and the other main surface, and the concave portion or convex portion on the one main surface side is the concave portion or convex portion on the other main surface side. The predetermined pitch may be shifted. According to this, the diffusion efficiency of the light guide plate 26 is increased.

  Furthermore, the light guide plate 26 and the phosphorescent sheet 25 are provided on the front side and the back side, respectively, with the reflection sheet 21 interposed therebetween, and different information display may be performed on the front and back sides. According to this, a guidance display device that can be visually recognized from the other side, such as a guide plate, is realized.

  A plurality of phosphorescent sheets 25 may be laminated. According to this, the amount of emitted light can be increased.

  Furthermore, a milk half plate 27 and a design sheet 28 may be sequentially laminated on the side of the light guide plate 26 opposite to the position where the phosphorescent sheet 25 is disposed. According to this, it becomes possible to suitably irradiate the printing surface of the design sheet with the light stored in the light source or the phosphorescent sheet, and to perform various guidance displays.

  Therefore, according to the guidance display device according to the second embodiment, a display with a creamy color is suppressed, a highly designable display is realized, and light from the light source is efficiently derived during normal light emission. In addition to being able to store light, the light stored in the light storage layer can be derived efficiently during darkness.

  In addition, if a permeable sheet and an impermeable sheet are mixed as the design sheet, different guidance display can be performed during normal light emission and during dark rotation.

  The reflectance of the semi-transmissive reflective layer of the phosphorescent sheet employed in the examples of the present invention is in the region of 440 nm to 520 nm, which has a great influence on the phosphorescence (excitation) phenomenon and on the phosphorescence emission phenomenon, for example, 60 to 95%. It is. Further, the transmittance of the phosphorescent sheet employed in the examples of the present invention is a region of 440 nm to 520 nm, which has a large influence on the phosphorescent (excitation) phenomenon and the phosphorescent light emitting phenomenon, for example, 5 to 25% on average. , Realizing the transmittance. This means that it contributes to efficient light storage and light emission.

  Finally, Table 1 summarizes the illuminance, x (CIE chromaticity), y (CIE chromaticity), and the color difference when using the back side and the front side of the phosphorescent sheet. From the same table, it can be seen that the use of the back surface of the phosphorescent sheet gives better results than the case of using the front surface. Also, it can be seen that the CIE chromaticity is a good value that is not inferior to that in the case of using only the light guide plate.

The degree of color difference is visually confirmed and the evaluation is shown. Illuminance and chromaticity were measured with a color illuminance spectrometer.

DESCRIPTION OF SYMBOLS 1 Display panel 2 Reflective sheet 3 PET layer 4 Phosphorescent layer 5 Semi-transmissive reflective layer 6 Phosphorescent sheet 7 Light guide plate 8 Milk half plate 9 Design sheet 10 Transparent acrylic plate 11 Light source 12 Frame 20 Guide display device 21 Reflective sheet 22 PET layer 23 Light storage layer 24 Semi-transmissive reflective layer 25 Light storage sheet 26 Light guide plate 27 Milk half plate 28 Design sheet 29 Light source 29a LED
29b Substrate 30 Laminate 31 Housing 32 First holding member 33 Second holding member 34 Fixing member 35 Sealing lid 36 Through hole

Claims (15)

A light source that emits light;
A light guide plate adjacent to the light source and emitting light from the light source;
A light storage sheet for receiving and storing the light of the light guide plate and deriving the stored light; and
The phosphorescent sheet has a phosphorescent layer and a translucent reflective layer that guides light of the light guide plate to the phosphorescent layer and guides light stored in the phosphorescent layer to the light guide plate side. Display panel. One side of the light guide plate is a design sheet mounting surface on which a design sheet is mounted,
The display panel according to claim 1, wherein the phosphorescent sheet is arranged on the other side of the light guide plate, and the semi-transmissive reflective layer side is arranged toward the design sheet mounting surface side. The display panel according to claim 1, wherein a reflection sheet is provided on a side of the phosphorescent sheet opposite to a surface on which the light guide plate is disposed. The display panel according to claim 1, wherein the light guide plate has a plurality of concave portions or convex portions formed on at least one main surface thereof. The display panel according to claim 1, wherein a plurality of the phosphorescent sheets are stacked. A milk half plate, a design sheet, and a transparent acrylic plate are laminated in order on the opposite side of the light guide plate from the position where the phosphorescent sheet is disposed. Display panel. A light source that emits light;
A light guide plate adjacent to the light source and emitting light from the light source;
A phosphorescent sheet for receiving and storing the light of the light guide plate and deriving the stored light;
A housing that holds at least the light source, the light guide plate, and the phosphorescent sheet;
The phosphorescent sheet has a phosphorescent layer and a translucent reflective layer that guides light of the light guide plate to the phosphorescent layer and guides light stored in the phosphorescent layer to the light guide plate side. A guidance display device. The guide display device according to claim 7, wherein one side of the light guide plate is an information display surface side. The guidance display device according to claim 7, wherein a reflection sheet is provided on a side of the phosphorescent sheet opposite to a surface on which the light guide plate is disposed. The guide display device according to claim 7, wherein the light guide plate has a plurality of concave portions or convex portions formed on at least one main surface thereof. The light guide plate has a plurality of concave portions or convex portions formed on one main surface and the other main surface, and the concave portion or convex portion on the one main surface side is predetermined with the concave portion or convex portion on the other main surface side. The guidance display device according to claim 7, wherein the pitch is shifted. The guidance display device according to claim 7, wherein the light guide plate and the phosphorescent sheet are provided on a front surface side and a back surface side, respectively, with a reflection sheet interposed therebetween, and display different information on the front and back surfaces. . The display panel according to claim 7, wherein a plurality of the phosphorescent sheets are laminated. The guidance display device according to any one of claims 7 to 13, wherein a milk half plate and a design sheet are sequentially laminated on a side of the light guide plate opposite to a position where the phosphorescent sheet is disposed. A lighting device using a light guide plate,
A light source that emits light;
A light guide plate adjacent to the light source and emitting light from the light source;
A light storage sheet for receiving and storing the light of the light guide plate and deriving the stored light; and
The phosphorescent sheet has a phosphorescent layer and a translucent reflective layer that guides light of the light guide plate to the phosphorescent layer and guides light stored in the phosphorescent layer to the light guide plate side. A lighting device.