JP2006126423A - Afterglow display apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To realize an afterglow display apparatus capable of displaying information in high luminance, even at nights, without being supplied from a commercial power supply. <P>SOLUTION: A display panel section 2, in which a phosphorescent material contained in a prescribed pattern section and the pattern section afterglows, by being irradiated with at least one of visible light or ultra-violet light, is provided. A charge section 7 charges electromotive force from a solar battery section 3. A light-emitting control unit 6 converts charge power of the charge section 7 into a drive pulse, when surrounding light becomes lower than a prescribed value. A light emitting section 4 emits at least one of the visible light or the ultra-violet light, according to the drive pulse of the light emitting section control unit 6 using an LED and irradiates the phosphorescent material of the display panel 2 with either light. The phosphorescent material contains an afterglow oxide, and an ethylene glycol system compound or a zinc oxide mixed compound. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a phosphorescent display device capable of presenting information with high brightness even at night without receiving supply of commercial power.

  There has been proposed a phosphorescent display device that electrically irradiates a phosphorescent panel coated with a phosphorescent body with light including ultraviolet light and displays information using the afterglow of the phosphorescent panel. Since the afterglow time of the phosphorescent panel is long, external energy is required at the time of initial light emission of the phosphorescent panel, but no external energy for exciting the phosphor is required during this afterglow time. As this external energy, solar energy is used to convert light energy into electrical energy, and this electrical energy is temporarily stored in a secondary battery or capacitor, so that electric energy can be used at night without using a commercial power source. Can do. By using such accumulated electric energy for display of the phosphorescent panel, information can be displayed at night without a commercial power supply facility or without wiring work from the commercial power supply.

  Such a phosphorescent display device has a lower display brightness than an electric display device using a general commercial power supply, and thus is suitable for a guide sign with a small number of characters and a simple display pattern, an emergency guide light, a warning sign, and a guide map. Used. In addition, since the phosphorescent display device does not require a commercial power source or a primary battery as an external energy source, it is preferable to work on power sources such as places where there are no power supply facilities, sea and mountains where roads are difficult to maintain, roads, natural parks and gardens. It can be suitably used in places that cannot be used.

  In order to ensure nighttime recognizability as an information display device, increasing display brightness is the most important issue. For this reason, development of phosphors with long afterglow time and high afterglow brightness, improvement of excitation method for phosphors, improvement of method of converting daytime solar energy into electrical energy, and storage of stored electrical energy Improvement of the method for converting the phosphor to the excitation light is an important technique.

  Among such elemental technologies, a conventional technology for converting accumulated electric energy into excitation light of a phosphorescent material will be described. A “display device” is disclosed in Patent Document 1 (conventional example 1) as a related technology. This display device includes a solar battery, a secondary battery that charges an electromotive force of the solar battery, a light emitting unit that emits light by output from the secondary battery, and a phosphorescent body formed in an arbitrary shape. In particular, the power supplied from the secondary battery to the light emitting unit is intermittently supplied according to the afterglow characteristics of the phosphorescent body.

  FIG. 11 is a cross-sectional view showing the configuration of the display device in the above-described conventional example 1. The display device 10 includes a housing body 12 that holds the display surface 11 and protects internal structures, a solar cell module 13, and a pole 14 that supports the housing body 12. The display surface 11 includes a display layer 11a and a phosphorescent body 11b. The display layer 11a is formed of a flexible colored sheet so that the display pattern is raised. The phosphorescent body 11b is mixed with a phosphorescent material such as zinc or alkaline earth sulfide added with a trace amount of heavy metal when the resin plate is molded by an injection molding method or the like. It is formed by apply | coating.

  Inside the housing body 12 are housed a light emitting unit 15, a light emitting unit control device 16 and a secondary battery 17 shown in FIG. The light emitting unit 15 is a fluorescent lamp or the like, and it is desirable that the light emission spectrum includes a lot of short wavelength components. The light emitting unit control device 16 detects the electromotive force of the solar cell element, thereby intermittently operating the inverter 16c at a cycle shorter than the afterglow time of the phosphor 11b and the voltage detection circuit 16a for determining ambient brightness. The circuit 16b and an inverter 16c that turns on the light emitting unit 15 are configured.

  FIG. 13A is a characteristic diagram showing the relationship between the light emission luminance of the phosphor and the afterglow time. FIG. 13B is a characteristic diagram showing the relationship between the irradiation time of the light emitting unit that irradiates the phosphor and the luminous rate. From the graph of (A), if the afterglow time is 12 minutes or later, although the emission luminance is low, the luminance does not decrease. Moreover, from the graph of (B), if it irradiates for 3 minutes or more, it is supposed that the luminous rate will reach 100%. From such characteristics, when used for signs and displays, the light emitting unit 15 may be lit at a rate of 1 minute every 2 minutes and 30 seconds. When used for advertising, the light emitting unit is emitted at a rate of 1 minute per 10 minutes. What is necessary is just to light 15.

  As a conventional example 2, the main subjects are an excitation method for the phosphor, a method for storing sunlight energy by converting it into electric energy, and a method for converting the accumulated electric energy to excitation energy of the phosphor. “Apparatus” is disclosed in US Pat. The display device includes a display unit coated with a resin composition containing a phosphorescent body, an ultraviolet light source that irradiates the display unit with ultraviolet rays, a storage battery or capacitor that serves as an irradiation power source for the ultraviolet light source, and a storage battery or capacitor. Light source lighting control means for intermittently supplying the stored power to the ultraviolet light source, and a solar battery for supplying charging power to the storage battery or capacitor in the daytime.

  FIG. 14 is a block diagram showing the configuration of this display device. The display device 20 includes a display unit 22 including a phosphorescent body 21 and a transparent plate 22a, an ultraviolet light source 23, a storage battery or capacitor 24, a solar battery 25, and a lighting control circuit 26. The solar battery 25 is connected to the storage battery 24 via the backflow prevention diode 27, whereby the charging circuit 28 is configured. The lighting control circuit 26 inputs the electric power of the storage battery 24 and generates a high voltage at the time of startup, thereby supplying lighting power to the ultraviolet light source 23. The lighting control circuit 26 includes a timer circuit and an inverter circuit that light the ultraviolet light source 23 intermittently.

  With such a configuration, power is stored in the storage battery 24 by the solar battery 25 during the day, and the ultraviolet light source 23 is intermittently turned on using the power stored in the storage battery 24 at night. Light energy is given to the phosphor when the ultraviolet light source 23 is turned on, and information can be displayed by light emission from the phosphor when the ultraviolet light source 23 is turned off.

  However, in the display device 10 of the conventional example 1, when used for a road sign or the like, since the display surface using the phosphorescent material is wide, when the light emitting die auto is used as the phosphorescent excitation light source of the phosphorescent material, luminance unevenness occurs on the display surface. In addition, as the number of light emitting die autos increases, there is a problem that the power consumption increases and the cost of the light emitting unit increases. Further, in this conventional example 1, a fluorescent lamp having more ultraviolet light components than other light sources is used as the phosphorescent excitation light, but the hot cathode type is less expensive but has a problem that the power consumption at startup becomes large. There was also. Further, in the case of the cold cathode type, there is a problem that a large size for illumination is difficult to obtain in the market and the cost is increased.

  Further, the display device 20 of the conventional example 2 also uses a fluorescent lamp as an ultraviolet light source. For this reason, the same problem as in Conventional Example 1 exists.

  When the fluorescent lamp is intermittently driven (pulse driven), a high voltage is required at the time of startup, and a voltage inverter is required when the display device is a battery-driven system. In addition, the power at the time of starting the fluorescent lamp is much larger than that at the time of continuous lighting. For this reason, the intermittent drive method has a common problem that the electric charge stored in the battery and the capacitor is immediately consumed by the solar cell, and the display brightness of the display device is lowered and the display time is shortened. . Furthermore, the fluorescent lamp and its starter circuit have a short life and require maintenance work such as lamp replacement. Further, since the voltage inverter is used, there is a drawback that the cost of the circuit portion is increased.

Further, in the conventional examples 1 and 2, there is no description that the phosphorescent body has been specially improved as a display device, and a phosphorescent material for a display panel that is easily available on the market may be applied or a display panel resin may be applied. It is presumed that the material filled was used. For this reason, there is a problem that the cost increases when a large amount of phosphorescent oxide is used for the phosphorescent material in order to increase the afterglow luminance because the phosphorescent rate is not sufficient.
Japanese Utility Model Publication No. 62-146299 JP-A-9-230812

  The present invention has been made in view of such a problem, and uses a phosphor that has excellent luminous characteristics, and has a uniform display luminance even when the display area is large, and is consumed by one light emission. An object of the present invention is to realize a phosphorescent display device that can reduce the amount of electric charge (electric energy) of a battery or a capacitor, has a long display time, and has a high display luminance.

  In order to solve this problem, the phosphorescent display device of the present invention has a display pattern portion formed using a phosphorescent material containing a phosphorescent oxide and an ethylene glycol compound or a zinc oxide mixed compound, and at least visible light and ultraviolet light. The display panel portion that stores the display pattern portion by one irradiation, a solar cell portion that photoelectrically converts ambient light, a charging portion that charges an electromotive force from the solar cell portion, and the ambient light below a predetermined value A light emitting unit control unit that converts the charging power of the charging unit into a driving pulse, and at least one of visible light and ultraviolet light is emitted by the driving pulse of the light emitting unit control unit, and the display panel unit And a light emitting unit for irradiating the phosphorescent body.

  Here, the display panel unit includes a transparent resin substrate, a protective coating layer provided on the surface of the transparent resin substrate, and a phosphorescent body in which a phosphorescent material is printed in a predetermined pattern on the back surface of the transparent resin substrate by screen printing. And a printing unit.

  Here, the display panel unit includes a transparent resin plate, a protective coating layer provided on the surface of the transparent resin plate, and a phosphorescent body in which a phosphorescent material is printed in a predetermined pattern on the back surface of the transparent resin plate by screen printing. And the light emitting unit is an LED array in which a plurality of LEDs that emit at least one of visible light and ultraviolet light are arranged, and the LED array is disposed on the back surface of the transparent resin plate. It may be attached.

  Here, the charging unit may include either a capacitor or a capacitor.

  Here, the light emitting unit control unit includes a voltage detector that detects the voltage of the charging unit, a timer that outputs time information, and a time when the detection voltage of the voltage detector indicates a predetermined value or more, or the time of the timer And a pulse generation circuit that converts the power of the charging unit into a drive pulse and outputs it when the information indicates a specific time range.

  Here, when the light emitting unit is an LED array in which a plurality of LEDs that emit at least one of visible light and ultraviolet light are arranged, LEDs that are given to individual LEDs by shifting the output of the pulse generation circuit in terms of time A scanning circuit may be provided in the light emitting unit control unit.

  The phosphorescent display device of the present invention uses a phosphorescent material having excellent phosphorescent characteristics and an LED array, so that uniform display luminance can be obtained even when the display area is large, and the charge of the battery or capacitor consumed by one light emission. The amount of (electric energy) can be reduced, and a display with a long display time and high display luminance can be obtained. Since no commercial power source or primary battery is required as an external energy source, it can be used at night in places where there is no power supply facilities, in the sea and mountains where maintenance is difficult, roads, natural parks and gardens where power construction is not preferred. This display device has an effect that cannot be realized by other means.

  A phosphorescent display device according to an embodiment of the present invention will be described. FIG. 1A is a cross-sectional view showing the structure of the phosphorescent display device 1 in the present embodiment, and FIG. 1B is a front view showing an overview of the phosphorescent display device 1. As shown in the figure, the phosphorescent display device 1 includes a display panel unit 2, a solar cell 3, a light emitting unit 4, a housing 5, a light emitting unit control unit 6, and a charging unit 7.

  The display panel unit 2 is a part that is attached to the front surface of the housing 5 and displays information. The display panel unit 2 includes a protection plate 2a, a transparent plate 2b, and a phosphorescent material printing unit 2c from the front surface. The solar cell 3 is attached to a part of the front surface of the display panel unit 2 or the top surface of the housing 5, performs photoelectric conversion when irradiated with sunlight, and supplies the storage power to the phosphorescent display device 1. . The light emitting unit 4 includes a substrate 4b on which the LED array 4a and the light emitting unit control unit 6 are incorporated. The charging unit 7 may be not only a secondary battery including a storage battery, but also a large-capacity capacitor or a storage capacitor having an electric double layer.

  When the phosphorescent display device 1 is used for guidance display in an emergency, as shown in FIG. 1B, in the display panel unit 2, for example, a human-shaped pattern uses a phosphorescent material on the back side of an acrylic transparent plate 2b. Screen-printed or lettering. However, in the case of a time display at a bus stop, characters are drawn using a phosphorescent body by screen printing or lettering on the surface of the thin transparent plate 2a.

  Next, the light emitting unit control unit 6 will be described. When the current (voltage) generated from the solar cell 3 is equal to or higher than the specified value, the light emitting unit control unit 6 charges the charging unit 7 and when the brightness around the phosphorescent display device 1 is lower than the set value, Or when it becomes a specified time range, it is a circuit which converts the DC voltage (current) of the charging unit 7 into a pulse voltage (current) and drives the LED array 4a in pulses. A block diagram showing a configuration of the light emitting unit control unit 6 is shown in FIG. The light emitting unit control unit 6 includes a backflow prevention element 6a and a voltage detector 6b of the charging unit 7, a 24H timer 6c, a pulse generation circuit 6d that converts direct current into pulses, and LED scanning that sequentially drives the LED array 4b. Drive circuit 6e.

  The pulse generation circuit 6d converts the direct current of the charging unit 7 into a pulse when the charging voltage of the charging unit 7 is determined to be equal to or higher than a specified value by the voltage detector 6b or when the output of the timer 6c indicates the time in the reference range. To do. As will be described later, the pulse generation circuit 6 d has an intermittent drive mode and a pulse activation mode, and these modes can be selected depending on the purpose of use of the phosphorescent display device 1. When the phosphorescent display device 1 is used, for example, in a bus stop timetable or an operation route map, the timer 6c issues an instruction to operate the light emitting unit 4 only in the night operation time zone. Further, in the case of a device having a plurality of display units in the display panel unit and the display contents change depending on the time zone, the lighting of each display unit is controlled by the timer 6c.

  When the area of the display panel unit 2 is large, when the LEDs that are point light sources are arranged at a large pitch, luminance unevenness occurs when viewed from the entire panel. FIG. 3 is a plan view showing an LED arrangement example of the LED array 4a. Here, L11, L12,... Are arranged as LEDs in the first row, and L21, L22,. The LED scanning drive circuit 6e pulse-drives L11, L12,... At the timing shown in FIG. Since such a drive circuit (driver) is used in large quantities in other display fields, even if the number of LEDs is large, it can be obtained at low cost.

  FIG. 5A is an explanatory diagram showing the relationship between the distance d between the phosphor and the LED itself and the residual illuminance Lp of the phosphor. FIG. 5B is an explanatory diagram showing a light storage distribution of the light storage body by irradiation with a plurality of LEDs. When the interval d is reduced, the illuminance of the spot increases as shown in FIG. Considering such circumstances, the LED array pitch in the LED array 4a is set. Further, when the LEDs are driven by scanning sequentially as shown in FIG. 4, the burden on the power supply circuit is less than when all the LEDs are turned on simultaneously. Since the afterglow time of human eyes is long, even if sequential scanning is performed, if the scanning cycle is below a certain level, the entire panel always appears to emit light.

  In the phosphorescent display device of the present invention, there are characteristics of a phosphorescent material and pulse driving conditions (intermittent driving conditions) as important elements for increasing the afterglow luminance. These items will be described in detail below. Conventionally, various types of phosphorescent materials are known. The phosphor is composed of phosphorescent oxide. The phosphorescent oxide, when absorbing energy such as light, accumulates the energy inside, and emits light by the transition of atoms between the band gaps. Depending on the type of excitation method, it is classified into photoluminescence, electroluminescence (EL), thermal minescence, and the like.

  Phosphors are used in various fields such as display boards, advertisement media, buttons on remote controls, anti-slip materials for stairs, and display of clock characters as described in the prior art. In such a luminescent product, it is clear that higher luminance is desirable. For this reason, the brightness | luminance can be improved by using a phosphorescent oxide in large quantities. However, since the phosphorescent oxide is expensive, the cost of the product including the display device is increased. Therefore, an attempt was made to improve the luminance and afterglow time without increasing the amount of phosphorescent oxide used.

  As a measure for improving the luminance with respect to the phosphorescent oxide, an ethylene glycol compound or a zinc oxide mixture was used in order to suppress the action of free end oxygen as an oxide defect. The compound in this case has an effect of absorbing light energy, particularly light energy in the ultraviolet region, and converting it into heat energy. The applicant has found that the light emission power, that is, the light emission brightness of the phosphorescent oxide is improved by the thermal energy obtained from the light energy. These compounds can be used in any form such as powder, liquid or granule. It was found that when a phosphorescent coating film is formed using a coating solution, a powdery one is preferable.

In the phosphor used in the present embodiment, it is preferable to use the additive in a proportion of 5% to 20%. As the phosphorescent oxide, conventionally known phosphorescent pigments, for example, pigments represented by the formula (1) obtained from oxides such as barium, strontium, and calcium are used.
MAl ₂ O ₄ (1)
However, M is a substance containing at least one of barium, strontium, and calcium.

  The phosphorescent oxide represented by the formula (1) is a mother crystal, or a magnesium-added oxide obtained by adding magnesium to this oxide-based compound, or eurobium as an activator for these oxides or magnesium-added oxides In addition, activated photoluminescent oxides to which dyspronium or neodymium is added can also be used.

  The phosphorescent oxide thus obtained was irradiated with a xenon lamp for 15 minutes, and the emission spectrum after excitation was examined. As a result, the emission intensity of the phosphorescent oxide by strontium silicate aluminate was 1.5 times higher than the emission intensity. It was confirmed that strength was obtained. Furthermore, it was found that the afterglow time to reach half the maximum luminance is 1.2 times that of the phosphorescent oxide by strontium silicate aluminate.

  Here, the luminous rate and the afterglow time when the luminous body is irradiated with excitation light emission will be described with reference to FIG. When the phosphor is irradiated with excitation light, the relationship between the irradiation time ts and the phosphor storage rate Op of the phosphor is as shown in (A). That is, when the irradiation time ts is short, a sufficient luminous rate Op cannot be obtained. Increasing the irradiation time ts increases the luminous rate Op, and further increasing the irradiation time ts saturates the value of the luminous rate Op. Further, when the excitation light is cut off after a sufficient irradiation time ts, the relationship between the luminous rate Op of the phosphor and the afterglow time tz becomes as shown in (B). This is afterglow due to spontaneous emission of the phosphor, and the phosphorescent display device of the present invention utilizes this phenomenon.

  FIG. 6 shows the afterglow characteristics of a phosphorescent body excited by direct current using a fluorescent lamp or an LED having an ultraviolet light component. The case where excitation light is generated by pulse driving or intermittent driving will be described. When the irradiation time of excitation light for light storage is ts, the relationship between the irradiation time ts and the light storage rate Op generally has a characteristic as shown in FIG. If the curve indicated by the broken line is an A curve, it can be seen that the saturation point of the luminous rate is reached in 2 to 3 minutes from the A curve. Even if the irradiation time is lengthened, the luminous rate does not increase when the light is accumulated up to the saturation point.

  On the other hand, after irradiating the excitation light to near the saturation point of the phosphor (irradiation time ts) and then stopping the irradiation, as shown by the solid line portion in FIG. In this case, the time required to reach a predetermined luminous rate with respect to the luminous rate when irradiation is stopped is referred to as afterglow time tz. This attenuated luminous rate is basically set based on the luminous rate at which it is confirmed that a human visual phosphor is afterglow in a dark environment. The afterglow curve in FIG. 6B is referred to as a B curve. When phosphorescence is accumulated up to the saturation point, the afterglow time does not change much even if phosphorescence is accumulated further.

  As described above, even if the excitation light irradiation time is increased, the afterglow time of the phosphor is not further increased. Therefore, if the display device has a limited power capacity as a storage power source, the phosphor is periodically stored. It may be preferable to intermittently irradiate the body. In addition, by using the above-described phosphorescent oxide, a display with a high phosphorescence rate can be obtained even with intermittent irradiation or pulse irradiation.

  Here, the conditions of pulse driving were further examined. Here, in order to promote the initial light emission of the phosphor, the application time (irradiation time) of the driving power to be applied first is ts1. This time ts1 is preferably equal to or longer than the irradiation time ts of the broken line portion shown in FIG. The second, third,... Nth drive following the initial drive of the phosphor is made to have the same condition (pulse width) as the initial drive, and its repetition cycle is tw. A method of intermittently driving in the period tw with all the irradiation times in each period being the same ts is called an “intermittent driving method”. In this case, the relationship between the excitation light drive waveform and the afterglow intensity of the phosphor is as shown in FIG. Here, the irradiation time ts was 15 seconds, and the irradiation cycle tw was 5 minutes. In this case, the duty is 5%, but in such intermittent driving, the average afterglow illuminance is BLx = 3.1Lx as shown by the alternate long and short dash line, and the recognizability as a display device is maintained.

  Next, the drive power application time (irradiation time) to be applied first is set to ts1 as in the case of the intermittent activation method. The second, third,... Nth drive waveforms following the initial drive of the phosphor are pulses, the pulse width is Tp, and the repetition period is ty. The period ty is shorter than the period tw described above. Such a driving method in which the driving waveform following the initial driving is a pulse having a short time width is called a “pulse driving method”. In this case, the relationship between the drive waveform of the excitation light and the afterglow illuminance of the phosphor is the C curve in FIG. Here, the initial irradiation time ts1 was 15 seconds, the pulse width Tp was 1.4 milliseconds, and the irradiation period ty was 20 milliseconds. In this case, although the duty is 7%, the average afterglow illuminance is CLx = 3.9Lx, that is, CLx> BLx as shown by the one-dot chain line, and the recognizability as a display device is sufficiently maintained. In addition, the power consumption related to the excitation of the phosphor can be further reduced than in the case of the intermittent drive method.

  The intermittent driving or pulse driving described above is a driving method for a specific single LED. In this embodiment, since the LED array 4a as shown in FIG. 3 is used, driving by sequential scanning as shown in FIG. 4 (scan driving) is performed. As an example, when the number of LEDs is five, 500 mW of power is consumed simultaneously in simultaneous driving, whereas 100 mW of power is distributed in scanning driving. When the number of LEDs is plural, the excitation light from one LED affects the phosphorescent body located in the other LED portion, so overall, the scan drive consumes less power as a display device. It turns out that it falls.

  In the market, LEDs are also supplied from those that emit white light to those that contain ultraviolet light components. Conventional phosphors were more efficient when excited by irradiation with ultraviolet light. However, as shown in FIG. 10, the luminous rate Op is being secured even with the phosphor and the ultraviolet to white visible light. As described above, an LED having a life longer than that of a fluorescent lamp can be used as an excitation light source by shifting the excitation wavelength of the phosphor to the longer wavelength side and shortening the emission spectrum of the LED.

  In addition, since the LED arrangement method and the number of LEDs can be set in accordance with the shape and size of the display panel unit, a display device according to the purpose of use can be easily realized. Moreover, since the lifetime of the LED is much longer than that of a fluorescent lamp, maintenance work such as lamp replacement can be eliminated. Such a feature is advantageous when the display device is used as a maritime buoy.

  Since the phosphorescent display device of the present invention does not require a commercial power source or a primary battery as an external energy source, it can be used in places where there is no power supply facility, in places where it is difficult to maintain, such as the sea and mountains, roads, natural parks, and gardens. It can be suitably used in places where construction is not preferred. Such a phosphorescent display device is suitably used for guide signs, emergency guide lights, warning signs, maritime buoys, bus stop timetables, route guide maps, and the like.

(A) is sectional drawing which shows the structure of the luminous display apparatus in embodiment of this invention, (B) is a general-view figure of the luminous display apparatus seen from the display surface. It is a block diagram of the issuing part control unit provided in the luminous display apparatus of this Embodiment. It is explanatory drawing of the LED array provided in the luminous display apparatus of this Embodiment. It is explanatory drawing which shows the drive method of a LED array. It is explanatory drawing which shows the relationship between the space | interval of LED and a luminous body, and the luminance distribution of a luminous body. It is a characteristic view which shows the luminous rate and the afterglow characteristic of a luminous body. (A) is a characteristic diagram which shows the change of the luminous rate at the time of giving a continuous excitation light to a luminous body, (B) is a characteristic figure which shows the change of the luminous rate at the time of giving excitation light to a luminous body for a short time. . It is a characteristic view which shows the afterglow illumination intensity at the time of giving intermittently driven excitation light with respect to a luminous body. It is a characteristic view which shows the afterglow illumination intensity at the time of giving the pulsed excitation light with respect to a luminous body. It is a spectrum figure which shows the excitation characteristic of a luminous body. It is sectional drawing which shows the structure of the display apparatus in the prior art example 1. It is a block diagram of the light emission part control apparatus of the display apparatus in the prior art example 1. FIG. It is a characteristic view of the light emission luminance of the display apparatus in the prior art example 1, and a luminous storage rate. It is a block diagram of the display apparatus in the prior art example 2.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Light storage display apparatus 2 Display panel part 2a Protection board 2b Transparent board 2c Light storage material printing part 3 Solar cell 4 Light emission part 4a LED array 4b Board | substrate 5 Case 6 Light emission part control unit 6a Backflow prevention element 6b Voltage detector 6c Timer 6d Pulse Generation circuit 6e LED scanning drive circuit 7 Charging part

Claims (6)

A display pattern portion is formed using a phosphorescent material containing a phosphorescent oxide and an ethylene glycol compound or a zinc oxide mixed compound, and the display pattern portion stores light by irradiation of at least one of visible light and ultraviolet light, and
A solar cell unit that photoelectrically converts ambient light;
A charging unit for charging an electromotive force from the solar cell unit;
When the ambient light becomes a predetermined value or less, a light emitting unit control unit that converts the charging power of the charging unit into a driving pulse;
And a light-emitting unit that emits at least one of visible light and ultraviolet light by a drive pulse of the light-emitting unit control unit, and irradiates a phosphorescent body of the display panel unit. The display panel unit
A transparent resin substrate; a protective coating layer provided on the surface of the transparent resin substrate; and a phosphor storage printing portion in which a phosphor is printed in a predetermined pattern on the back surface of the transparent resin substrate by screen printing. The phosphorescent display device according to claim 1, which is characterized. The display panel unit
It has a transparent resin plate, a protective coating layer provided on the surface of the transparent resin plate, and a phosphor storage printing portion in which a phosphor is printed in a predetermined pattern by screen printing on the back surface of the transparent resin plate. Yes,
The light emitting unit
2. The phosphorescent display device according to claim 1, wherein the LED array includes a plurality of LEDs that emit at least one of visible light and ultraviolet light, and the LED array is attached to a back surface of the transparent resin plate. .   The phosphorescent display device according to claim 1, wherein the charging unit includes one of a capacitor and a capacitor. The light emitting unit control unit is:
A voltage detector for detecting the voltage of the charging unit;
A timer that outputs time information;
A pulse generation circuit that converts the power of the charging unit into a drive pulse and outputs it when the detection voltage of the voltage detector indicates a specified value or more, or when the time information of the timer indicates a specific time range, and The phosphorescent display device according to claim 1.   When the light emitting unit is an LED array in which a plurality of LEDs that emit at least one of visible light and ultraviolet light are arranged, an LED scanning circuit that shifts the output of the pulse generation circuit to each LED by temporally shifting The phosphorescent display device according to claim 1, wherein the light emitting unit control unit is provided.

Images