JP2011221205A - Display appliance - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a display appliance capable of maintaining a state where a viewer can visually recognize a message on the display appliance over a long term in a situation where it is difficult to visually recognize the message on the display appliance only by external light.SOLUTION: A display appliance 1A comprises a first light-emitting member 14 in which phosphorescent light-emitting particles are held by a translucent filler, a second light-emitting member 15 having an organic EL light-emitting layer 16, and a power supply 20 for applying a voltage to the organic EL light-emitting layer 16, where the organic EL light-emitting layer 16 is placed under the first light-emitting member 14.

Description

  The present invention relates to a display device capable of clearly transmitting a message to a viewer through vision over a long period of time even in a situation where there is only brightness of external light where it is difficult for the viewer to visually recognize an object.

  There are display devices around us to transmit various messages. For example, in a basement or building that is not exposed to sunlight, a display device that indicates an emergency exit location or the like is installed in preparation for an emergency. Display devices installed for emergencies have a built-in light source, and the light emitted from the light source illuminates the message of the display device. By viewing the brightly illuminated message, the viewer gets the information he needs when he needs it.

  In preparation for the case where power cannot be supplied to the light source of a display device, a display device that displays a message in an easy-to-understand manner using a fluorescent material has been proposed (see Patent Document 1). In such display devices, external light hits the fluorescent material in normal times, and the fluorescent material stores the hit light as energy. Even if it is difficult to see the display device only with light from the outside world, the fluorescent substance itself emits light, and the message of the display device is transmitted to the viewer through vision, so that the viewer can take appropriate actions. it can.

Japanese Utility Model Publication No. 06-010979

However, there is a limit to the amount of energy that the fluorescent material can store. Therefore, in a situation where it is difficult to visually recognize the display device only with light from the outside, the time during which the fluorescent material of the display device continues to emit light is limited. When the fluorescent light of the display device is no longer exposed to external light, the fluorescent material only releases the stored energy. Then, after the energy stored in the fluorescent material is released, the viewer cannot visually recognize the message on the display device.
The present invention solves the above-described problems, and the object of the present invention is to provide a message displayed on a display device by a viewer in a situation where it is difficult to visually recognize the message on the display device only with the brightness of light from the outside. It is providing the display apparatus which can maintain the state which can be visually recognized over a long period of time.

  The present invention adopts the following configuration in order to solve the problem. The display device according to the invention of claim 1 includes a first light emitting member in which luminous phosphor particles are held by a light-transmitting filler, a second light emitting member having an organic electroluminescence light emitting layer, and A power source for applying a voltage to the organic electroluminescent light emitting layer to emit light, and the organic electroluminescent light emitting layer of the second light emitting member is positioned below the first light emitting member.

The phosphorescent luminescent particles are not particularly limited as long as they have the property of storing and emitting light. Examples of the luminous phosphor particles include particles obtained by pulverizing pellets formed by firing other oxides and rare earth elements using aluminum oxide as a base material.
In the first light emitting member, the filler for holding the luminous phosphor particles may be translucent, transparent, translucent, or opaque. Also good. The filler may be colorless or colored, but is preferably highly translucent. Examples of the material for forming the filler include a resin material and a glass material. It is also possible to use ceramic glaze as a filler.

The material for forming the organic electroluminescence light emitting layer may be, for example, a low molecular material or a polymer material. In the following description, “organic electroluminescence light emitting layer” is referred to as “organic EL light emitting layer”.
The power source may be, for example, an external commercial power source, a power source independent from the outside such as a battery, or a combination of these. For example, when using an external commercial power supply and a power supply independent from the outside, the external commercial power supply is used during normal times, and the power supply independent from the outside is used in an emergency such as when the power supply from the external commercial power supply stops. Can be used.

A translucent plate having translucency can be disposed on the upper side of the first light emitting member. The light-transmitting plate can prevent the first light-emitting member from being damaged. The translucent plate may be transparent or translucent. Further, the translucent plate may be colorless or colored as long as it has translucency. The translucent plate is preferably a material having impact resistance and strength. Examples of the material for forming the light transmitting plate include a resin material and a glass material.
The 1st light emission member should just have the figure and character outline which make a message, for example. The graphic or character of the message may be printed on the first light emitting member. Moreover, when arrange | positioning a translucent board above the 1st light emitting member, you may print the figure and character of a message on this translucent board.

When the organic EL light emitting layer emits light by applying a voltage, the light hits the first light emitting member on the second light emitting member. The luminous phosphor particles in the first light emitting member absorb the hit light and store energy. Since the filler that holds the luminous phosphor particles has translucency, the light emitted from the second luminous member passes through the filler and uniformly strikes the entire luminous phosphor particles.
When external light hits the display device, the luminous phosphor particles in the first light emitting member absorb external light and store energy. Further, in this case, the viewer can visually recognize the message on the display device by light from the outside.

When the external light is not applied to the display device or when the brightness of the external light applied to the display device is weak, if the organic EL light emitting layer of the second light emitting member emits light, the second light emitting member is the first light emitting member. It functions as a backlight of the light emitting member, and the viewer can visually recognize the message on the display device. Even when the organic EL light emitting layer of the second light emitting member does not emit light, the phosphorescent light emitting particles in the first light emitting member emit the stored energy to emit light, thereby giving the viewer Can see the message on the display device.
The first light emitting member and the second light emitting member only need to be overlapped with each other, and the power source can be installed at an arbitrary position, so that the display device can be easily thinned. In addition, since the lifetimes of the first light emitting member and the second light emitting member are much longer than the lifetimes of fluorescent lamps, LEDs, and the like, the maintenance of the display device can be simplified.

A display device according to a second aspect of the present invention is the display device according to the first aspect, wherein a base material whose upper surface is formed of a mirror surface is positioned below the second light emitting member.
When a part of the light emitted from the second light emitting member hits the base material on the lower side of the second light emitting member, the light hitting the base material is reflected by the mirror surface of the base material and stored in the first light emitting member. Hitting the light-emitting particles. Therefore, the luminous phosphor particles can efficiently absorb the energy of light emitted from the second light emitting member.

A display device according to a third aspect of the present invention is the display device according to the first or second aspect, wherein the power source is a solar cell that receives light and performs photoelectric conversion, and photoelectric conversion of the solar cell. A power storage unit that stores the generated electromotive force, and the power storage unit applies voltage to the organic electroluminescence light emitting layer to emit light.
When the external light hits the display device, the power storage unit stores electric power generated from the solar cell by the external light. Moreover, the luminous phosphor particles in the first light emitting member hit the outside light and store energy.

  When the outside light is lost or the brightness of the outside light is weakened, the luminous phosphor particles in the first light emitting member emit light because they have already stored energy. In addition, a voltage is applied from the power storage unit to the organic EL light emitting layer of the second light emitting member, and the second light emitting member emits light. And even after the application of the voltage from the power storage unit to the organic EL light emitting layer is stopped, the luminous phosphor particles in the first light emitting member have already stored energy by hitting the light emitted by the second light emitting member. The first light emitting member continues to emit light by releasing the stored energy. Therefore, the viewer can continue to visually recognize the message on the display device.

  A display device according to a fourth aspect of the present invention is the display device according to any one of the first to third aspects, wherein the brightness of the light emitted by the first light emitting member is detected. And a control unit that controls a voltage applied from the power source to the organic electroluminescence light-emitting layer, and (brightness of light emitted by the first light-emitting member detected by the detector) > (Brightness of light emitted by the first light emitting member set in advance) or (Brightness of light emitted by the first light emitting member detected by the detector) ≧ (First light emission set in advance) When the first condition, which is the brightness of the light emitted by the member, is satisfied, the control unit stops applying the voltage from the power source to the organic electroluminescent light emitting layer, and When the condition is not satisfied, the control unit Performing application of voltage to the organic electroluminescent light emitting layer from.

The “brightness of light emitted from the first light-emitting member set in advance” means, for example, that a viewer can display a message from the display device only by light emitted from the first light-emitting member in a situation where there is no external light. Is at least the minimum brightness that can be visually recognized.
When the first condition is satisfied, the viewer can visually recognize the message on the display device in a situation where there is no external light and the second light emitting member is not emitting light.

  When the first condition is not satisfied, the viewer cannot visually recognize the message on the display device in a situation where there is no external light and the second light emitting member is not emitting light. Alternatively, it is difficult for the viewer to visually recognize the message. Alternatively, the viewer is in a state just before it becomes difficult to see the message. In such a case, the control unit applies a voltage from the power source to the organic EL light emitting layer of the second light emitting member, and the second light emitting member emits light. The second light emitting member functions as a backlight, and the viewer can visually recognize the message on the display device. During this time, the luminous phosphor particles in the first light emitting member absorb the light emitted by the second light emitting member, and store energy. Even after the voltage application to the organic EL light emitting layer is finished, the first light emitting member continues to emit light by releasing the stored energy.

  From the viewpoint that the viewer visually recognizes the message on the display device, the second light emitting member does not need to emit light while the first condition is satisfied. Since the second light emitting member emits light based on whether or not the first condition is satisfied, waste of power from the power source is prevented. As a result, a state in which the viewer can visually recognize the message on the display device is maintained for a long period of time.

  A display device according to a fifth aspect of the present invention is the display device according to any one of the first to third aspects, wherein the detector detects the brightness of external light that hits the display device. And a control unit that controls a voltage applied to the organic electroluminescence light emitting layer by the power source, and (brightness of external light detected by the detector)> (preset light of external light (Brightness) or (brightness of outside light detected by the detector) ≧ (brightness of outside light set in advance) ≧ (preset brightness of outside light) When the application of the voltage from the power source to the organic electroluminescent light emitting layer is stopped and the second condition is not satisfied, the control unit controls the voltage from the power source to the organic electroluminescent light emitting layer. Apply.

  “Preliminary brightness of external light” refers to, for example, at least the minimum level at which a viewer can visually recognize a message on a display device in a situation where the first light emitting member and the second light emitting member are not emitting light. Brightness. Alternatively, it is at least the minimum brightness at which the viewer does not feel difficulty in visually recognizing the message on the display device in a situation where the first light emitting member and the second light emitting member are not emitting light.

When the second condition is satisfied, the viewer can visually recognize the message on the display device in a situation where the first light emitting member or the second light emitting member does not emit light.
When the second condition is not satisfied, the viewer is in a state where the message on the display device cannot be visually recognized under the situation where the first light emitting member and the second light emitting member are not emitting light. Alternatively, it is difficult for the viewer to visually recognize the message. Alternatively, the viewer is in a state just before it becomes difficult to see the message. In such a case, the control unit applies a voltage from the power source to the organic EL light emitting layer of the second light emitting member, and the second light emitting member emits light. The second light emitting member functions as a backlight, and the viewer can visually recognize the message on the display device. During this time, the luminous phosphor particles in the first light emitting member absorb the light emitted by the second light emitting member, and store energy. Even after the voltage application to the organic EL light emitting layer is finished, the first light emitting member continues to emit light by releasing the stored energy.

  From the viewpoint that the viewer visually recognizes the message on the display device, the second light emitting member does not need to emit light while the second condition is satisfied. Since the second light emitting member emits light based on whether or not the second condition is satisfied, waste of power from the power source is prevented. As a result, a state in which the viewer can visually recognize the message on the display device is maintained for a long period of time.

  A display device according to a sixth aspect of the present invention is the display device according to any one of the first to third aspects, wherein the detector detects the brightness of external light that hits the display device. And a storage unit that stores a correlation established between the amount of energy stored in the first light-emitting member and the time during which the first light-emitting member can continuously emit light having a predetermined brightness or higher And a control unit that controls a voltage applied from the power source to the organic electroluminescence light-emitting layer, and the control unit is preset based on the brightness of external light detected by the detector. An integrated value of the amount of energy stored in the first light emitting member within a specified time is calculated, and light having a brightness equal to or higher than a preset brightness of the first light emitting member is calculated based on the calculated integrated value and the correlation. The time that can be emitted continuously Derived as the pressure application start time, (brightness of outside light detected by the detector) <(brightness of outside light set in advance) or (brightness of outside light detected by the detector) ) ≦ (preliminary light brightness of the external environment) is satisfied, and the voltage application start time derived based on the integrated value at the time when the third condition is satisfied is satisfied. When the third condition is satisfied, the control unit starts applying a voltage from the power source to the organic electroluminescent light emitting layer.

  The “preset brightness in the first light emitting member” means, for example, that at least the viewer can visually recognize the message on the display device only under the light emitted by the first light emitting member in the absence of external light. The minimum brightness. Alternatively, the brightness is at least the minimum brightness at which the viewer does not feel difficulty in visually recognizing the message on the display device only by the light emitted by the first light emitting member in the absence of external light.

  “Preliminary brightness of external light” refers to, for example, at least the minimum level at which a viewer can visually recognize a message on a display device in a situation where the first light emitting member and the second light emitting member are not emitting light. Brightness. Alternatively, it is at least the minimum brightness at which the viewer does not feel difficulty in visually recognizing the message on the display device in a situation where the first light emitting member and the second light emitting member are not emitting light.

  The “preset time” can be set according to the conditions of the place where the display device is installed. When the display device is installed outdoors, for example, the time from sunrise to sunset in the winter solstice can be set as a preset time. In addition, when a display device is installed in a room or basement that is not exposed to sunlight, the time during which the illumination is normally lit within the day can be set as a preset time.

When the third condition is not satisfied, the viewer can visually recognize the message on the display device even in a situation where the first light emitting member and the second light emitting member do not emit light. Even if the third condition is not satisfied, if the brightness of the light emitted by the first light emitting member is at least the preset brightness of the first light emitting member, the viewer can display the display device. Can see the message.
From the time when the third condition is satisfied until the voltage application start time elapses, the brightness of the light emitted by the first light emitting member is at least the preset brightness of the first light emitting member. During this time, the light emission of the second light emitting member is unnecessary from the viewpoint that the viewer visually recognizes the message on the display device.

  At the time when the voltage application start time elapses from the time point when the third condition is satisfied, under the situation where there is no external light, the viewer can determine whether the display device is based only on the brightness of the light emitted by the first light emitting member. The message is in a state where it cannot be visually recognized, or is in a state just before the message cannot be visually recognized. Alternatively, the viewer is in a state where he / she feels difficulty in visually recognizing the message, or a state just before he / she feels difficulty in visually recognizing the message.

  When the voltage application start time elapses from the time when the third condition is satisfied, the control unit applies a voltage from the power source to the organic EL light emitting layer of the second light emitting member, and the second light emitting member emits light. The second light emitting member functions as a backlight, and the viewer can visually recognize the message on the display device. Moreover, the luminous phosphor particles in the first light emitting member absorb the light emitted by the second light emitting member and store energy. Even after the application of the voltage to the organic EL light emitting layer is finished, the first light emitting member continues to emit light by releasing the stored energy.

Since the voltage application start time is determined on the basis of the time when the third condition is satisfied, and the second light emitting member emits light, waste of power from the power source is prevented. As a result, a state in which the viewer can visually recognize the message on the display device is maintained for a long period of time.
The control unit derives a time during which the first light-emitting member can continuously emit light having a predetermined brightness or more. The time obtained by multiplying the derived time by the safety factor may be used as the voltage application start time.
The amount of energy stored in the first light emitting member can be represented by, for example, the sum of the amount of light hitting the first light emitting member.

  Because it is a display device as described above, it is possible for a viewer to view the message on the display device over a long period of time in a situation where it is difficult to view the message on the display device only with the brightness of the external light. Possible display devices can be provided.

(I) is a top view of a display device, and (ii) is a cross-sectional view taken along line II of (i). It is a wiring diagram of a display device. It is a block diagram explaining transmission / reception of the signal in a display apparatus. (I) is a top view of a display device according to Modification 1, and (ii) is a cross-sectional view taken along line II-II in (i). The 10 is a block diagram illustrating signal transmission / reception in a display device according to Modification Example 1. FIG. It is sectional drawing of the display apparatus which concerns on the modification 2. FIG. It is a block diagram explaining transmission / reception of the signal in the display apparatus which concerns on the modification 2. FIG.

A display device 1A according to the present invention will be described with reference to FIGS.
As shown in FIGS. 1 and 2, the display device 1A includes a light transmitting plate 10, a first light emitting member 14, a second light emitting member 15, a power source 20, a base material 27, a detector 32A, a control unit 36, and a switch. 43 and a case 47 for storing them.
The case 47 forms a flat cube whose upper part is open.
Solar cells 21 </ b> A and 21 </ b> B are housed inside the case 47. The solar cells 21 </ b> A and 21 </ b> B are respectively installed along the left and right inner walls of the case 47. The light receiving surfaces 22 of the solar cells 21 </ b> A and 21 </ b> B are exposed to the outside above the case 47, and light from the outside that is emitted from above the case 47 hits the light receiving surface 22. Moreover, the solar cells 21A and 21B are configured to be able to convert light from the outside that hits the light receiving surface 22 into electric power.

A detector 32A is installed on the light receiving surface 22 of the solar cell 21A. The detector 32A is configured to be able to detect the brightness B1 of external light that hits the display device 1A from above.
On the bottom surface in the case 47, the power storage unit 23, the control unit 36, and the switch 43 are arranged. The power storage unit 23 is connected to the solar cells 21A and 21B. The power storage unit 23 is configured to be able to store power generated by the solar cells 21A and 21B.
The solar cells 21 </ b> A and 21 </ b> B and the power storage unit 23 form the power source 20.

As shown in FIGS. 1 (ii) and 3, the control unit 36 includes a storage unit 37A and a calculation unit 38A. The storage unit 37A stores a predetermined brightness B2 of external light. The brightness B2 is the brightness of external light where the viewer can clearly see the message 52 even when the first light emitting member 14 and the second light emitting member 15 do not emit light.
The calculation unit 38A is configured to be able to receive the brightness B1 detected by the detector 32A from the detector 32A. The calculation unit 38A has a built-in program P1, and is configured to be able to transmit open / close signals S _ON and S _OFF to the switch 43 based on the calculation result of the program P1. The open / close signal S _ON is a signal for opening the switch 43, and the open / close signal S _OFF is a signal for closing the switch 43.

A plate-like base material 27 is disposed above the power storage unit 23 and the control unit 36. The upper surface of the base material 27 is a mirror surface 28.
The second light emitting member 15 is disposed above the mirror surface 28 of the base material 27. The second light emitting member 15 has an organic EL light emitting layer 16. The organic EL light emitting layer 16 is connected to the power storage unit 23 via the switch 43, and is configured to emit light by a voltage applied from the power storage unit 23 (see FIG. 2). The switch 43 is configured to be opened and closed by opening / closing signals S _ON and S _OFF received from the calculation unit 38A.

A first light emitting member 14 is disposed above the organic EL light emitting layer 16. In the 1st light emission member 14, the luminous luminous particle is hold | maintained with the filler which has translucency. The luminous luminous particles are exposed on the upper surface, the lower surface, and the side surfaces of the first light emitting member 14. A message 52 is printed on the upper surface of the first light emitting member 14.
A colorless and transparent translucent plate 10 is disposed on the upper side of the first light emitting member 14, and the message 52 can be seen from above the translucent plate 10.

When the display device 1A is viewed from above, the first light emitting member 14 is larger than the second light emitting member 15, and the light transmitting plate 10, the first light emitting member 14, and the mirror surface 28 of the base material 27 have the same size. Have. When the light transmitting plate 10 and the first light emitting member 14 are removed and the display device 1A is viewed from above, the mirror surface 28 of the base material 27 can be seen around the second light emitting member 15.
The parts exposed to the outside of the display device 1A are only the case 47, the light receiving surface 22 of the solar cells 21A and 21B, the detector 32A, and the translucent plate 10, and their joints are sealed to provide the display device 1A. Intrusion of moisture and moisture into the interior of the display device is prevented, and the display device 1A has an explosion-proof structure.

Next, the contents of the calculation process performed by the calculation unit 38A according to the program P1 will be described (see FIG. 3).
First, the calculation unit 38A compares the received brightness B1 with the brightness B2 stored in the storage unit 37A, and determines whether or not the following equation (1) is satisfied. Note that the expression (1) is an expression representing the first condition.
B1 ≧ B2 (1)
When the expression (1) is established, the arithmetic unit 38A transmits an open / close signal S _OFF to the switch 43. When the expression (1) is not satisfied, the arithmetic unit 38A transmits an open / close signal S _ON to the switch 43.
The display device 1A has the above-described configuration. Next, the operation and effect of the display device 1A will be described by taking as an example the case where the display device 1A is installed in a basement where sunlight does not enter.

When the basement is illuminated, the illumination light strikes the display device 1A. This illumination light forms the external light of the display device 1A. If the brightness of the illumination light hitting the display device 1A is equal to or higher than the brightness B2, even if the first light-emitting member 14 or the second light-emitting member 15 is not emitting light, the viewer only has the brightness of the illumination light. Thus, the message 52 of the display device 1A can be visually recognized.
The illumination light strikes the light receiving surfaces 22 of the solar cells 21A and 21B, and the solar cells 21A and 21B photoelectrically convert the light to generate electric power. The generated electric power is stored in the power storage unit 23.

  Illumination light passes through the translucent plate 10 and also strikes the first light emitting member 14. The luminous phosphor particles of the first light emitting member 14 store the hit light as energy and emit light by themselves. Even if the illumination light does not hit the display device 1A, the first light emitting member 14 emits the stored energy and emits light by itself, so that the viewer can send a message depending on the brightness of the light emitted by the first light emitting member 14. 52 can be visually recognized.

The detector 32A detects the brightness of the illumination light as the external brightness B1 of the display device 1A.
The brightness B1 is transmitted from the detector 32A to the calculation unit 38A of the control unit 36. The calculation unit 38A compares the brightness B1 and the brightness B2 by the program P1. When the expression (1) is established in this comparison, the calculation unit 38A transmits an open / close signal S _OFF to the switch 43, and the switch 43 is in an open state. In the state in which the switch 43 is opened, no voltage is applied from the power storage unit 23 to the organic EL light emitting layer 16, the organic EL light emitting layer 16 (that is, the second light emitting member 15) does not emit light, and the second light emitting member. No power is consumed by the power storage unit 23 by 15. If the formula (1) is established, even if the second light emitting member 15 is not emitting light, the viewer can clearly see the message 52 only by the brightness of the illumination light.

In comparison by the program P1 of the operation unit 38A, if not satisfied equation (1), the arithmetic unit 38A transmits a switching signal S _ON to the switches 43, in a state where the switch 43 is closed. In the state where the switch 43 is closed, a voltage is applied from the power storage unit 23 to the organic EL light emitting layer 16, and the second light emitting member 15 emits light. When the second light emitting member 15 emits light, the light illuminates the first light emitting member 14 from below. Since the second light emitting member 15 serves as the backlight of the first light emitting member 14, the viewer can clearly see the message 52 even if the brightness of the illumination light is reduced or the illumination is turned off.

  When the second light emitting member 15 illuminates the first light emitting member 14 from below, the light emitted by the second light emitting member 15 is contained in the filler that holds the luminous phosphor particles of the first light emitting member 14. And hits the upper surface of the first light emitting member 14. Further, the light that has come out of the second light emitting member 15 and hits the mirror surface 28 of the base material 27 is reflected by the mirror surface 28 and hits the first light emitting member 14. Therefore, the light emitted from the second light emitting member 15 is efficiently stored as energy in the luminous phosphor particles of the first light emitting member 14.

  Even if the brightness of the external light is lower than the brightness B2 for a long time, the viewer clearly indicates the message 52 by the light emitted by the second light emitting member 15 until the power storage unit 23 is completely discharged. Visible. And even after the electrical storage body 23 has been discharged, the first light emitting member 14 continues to emit light while the luminous phosphor particles of the first light emitting member 14 have energy, The message 52 can be clearly recognized by the brightness of the light emitted by the light emitting member 14.

A display device 1B according to Modification 1 will be described with reference to FIGS. The display device 1B having the same configuration as that of the display device 1A is denoted by the same reference numeral, and redundant description is omitted.
As shown in FIG. 4, in the display device 1 </ b> B, a detector 32 </ b> B is installed on the translucent plate 10 instead of the detector 32 </ b> A. The detector 32 </ b> B is located on the first light emitting member 14. The detector 32B is configured to be able to detect the brightness B3 of the light emitted from the first light emitting member 14.

The control unit 36 includes a storage unit 37B and a calculation unit 38B instead of the storage unit 37A and the calculation unit 38A. The storage unit 37B stores a predetermined brightness B4 of light emitted from the first light emitting member 14. The brightness B4 means that the viewer can send a message 52 based on only the brightness of the light emitted by the first light emitting member 14 in a situation where there is no external light and the second light emitting member 15 does not emit light. The brightness is clearly visible.
As shown in FIG. 5, the calculation unit 38B is configured to be able to receive the brightness B3 detected by the detector 32B from the detector 32B. The calculation unit 38B has a built-in program P2, and is configured to be able to transmit open / close signals S _ON and S _OFF to the switch 43 based on the calculation result of the program P2.

Next, the contents of the calculation process performed by the calculation unit 38B according to the program P2 will be described (see FIG. 5).
First, the calculation unit 38B compares the received brightness B3 with the brightness B4 stored in the storage unit 37B, and determines whether or not the following equation (2) is satisfied. This equation (2) is an equation representing the second condition.
B3 ≧ B4 (2)
When the expression (2) is satisfied, the calculation unit 38B transmits an open / close signal S _OFF to the switch 43. When the expression (2) is not satisfied, the arithmetic unit 38B transmits an open / close signal S _ON to the switch 43.
The parts exposed to the outside of the display device 1B are only the case 47, the light receiving surface 22 of the solar cells 21A and 21B, the detector 32B, and the light-transmitting plate 10, and their joints are sealed to provide the display device 1B. Intrusion of moisture and moisture into the interior of the display device is prevented, and the display device 1B has an explosion-proof structure.

The other configuration of the display device 1B is the same as that of the display device 1A.
The display device 1B has the configuration described above. Next, the operation and effect of the display device 1B will be described by taking as an example the case where the display device 1B is installed in a basement where sunlight does not enter.
If the brightness of the light of the basement illumination is greater than or equal to the brightness B2, the viewer can clearly see the message 52 only with the brightness of the illumination light. Further, when the formula (2) is established, even if the second light emitting member 15 does not emit light, the viewer can clearly see the message 52 only by the brightness of the light emitted by the first light emitting member 14. . If the expression (2) is not established and the second light emitting member 15 emits light, the second light emitting member 15 serves as the backlight of the first light emitting member 14, and the viewer can clearly see the message 52. it can.

When Expression (2) is satisfied, the calculation unit 38B transmits the open / close signal S _OFF to the switch 43 and the switch 43 is opened by the calculation process of the program P2, so that the power storage unit 23 applies a voltage to the organic EL light emitting layer 16. do not do. Therefore, the second light emitting member 15 does not emit light, and the second light emitting member 15 does not consume the electric power of the power storage unit 23.
Applying the equation (2) is not satisfied, the processing program P2, computation unit 38B transmits a switching signal S _ON to the switches 43, the switch 43 is closed, power storage unit 23 is a voltage to the organic EL light emitting layer 16 To do. Thereby, the 2nd light emission member 15 light-emits, and the viewer can visually recognize the message 52 clearly. The luminous phosphor particles of the first light emitting member 14 store the light emitted from the second light emitting member 15 as energy. Even after the second light emitting member 15 consumes the electric power of the power storage unit and the second light emitting member 15 has finished emitting light, the first light emitting member 14 continues to emit light.

That is, when the brightness of the illumination light is weakened or the illumination is turned off, first, the viewer can clearly see the message 52 by the brightness of the light emitted by the first light emitting member 14. Then, when the brightness of the light emitted from the first light emitting member 14 is weakened, the second light emitting member 15 starts to emit light, so that the viewer can clearly see the message 52 continuously. During this time, the first light emitting member 14 stores the light emitted by the second light emitting member 15 as energy. Furthermore, since the first light emitting member 14 emits light even after the second light emitting member 15 has finished emitting light, the viewer can clearly see the message 52 continuously. Therefore, the viewer can clearly see the message 52 over a long period of time.
Other actions and effects played by the display device 1B are the same as other actions and effects played by the display device 1A.

A display device 1C according to Modification 2 will be described with reference to FIGS. The display device 1C having the same configuration as the display device 1A is denoted by the same reference numeral, and redundant description is omitted.
As shown in FIGS. 6 and 7, the control unit 36 includes a storage unit 37C, a calculation unit 38C, and a clock 39 instead of the storage unit 37A and the calculation unit 38A.
The correlation R is stored in the storage unit 37C. The correlation R indicates that the amount of energy stored in the first light-emitting member 14 (that is, the luminous phosphor particles of the first light-emitting member 14) and the light that the first light-emitting member 14 has brightness B4 or higher are continuous. Thus, there is a correlation established between the time during which light can be emitted.

The storage unit 37C stores brightness B2 and a predetermined time T1. If the display device 1C is installed outdoors, the time T1 is, for example, the time from sunrise to sunset in the winter solstice. In addition, if the display device 1C is installed in a room or basement where sunlight does not shine, the time T1 is, for example, the time during the day when the illumination is normally lit in the room or basement. It is.
The calculation unit 38C is configured to be able to receive the brightness B1 detected by the detector 32A from the detector 32A. The calculation unit 38C has a built-in program P3 and is configured to be able to transmit the open / close signals S _ON and S _OFF to the switch 43 based on the calculation result of the program P3.
The clock 39 is configured to be able to transmit the time to the calculation unit 38C in real time.

Next, the contents of the calculation process performed by the calculation unit 38C according to the program P3 will be described (see FIG. 7).
First, based on the brightness B1 received from the detector 32A and the time received from the clock 39 by the program P3, the amount of energy stored in the first light emitting member 14 within the time T1 is integrated. The value E is calculated.
Then, according to the program P3, the calculation unit 38C derives the time corresponding to the calculated integrated value E from the correlation R of the storage unit 37C, and stores this derived time in the storage unit 37C as the voltage application start time T2. During the voltage application start time T2, the first light emitting member 14 that has stored an energy amount corresponding to the integrated value E continues to emit light having a brightness of B4 or more without being supplied with energy from the outside. Is possible time.

Further, by the program P3, the calculation unit 38C compares the brightness B1 and the brightness B2, and determines whether or not the following equation (3) is satisfied. Note that the expression (3) is an expression representing the third condition.
B1 <B2 (3)
When the expression (3) is not satisfied, the calculation unit 38C transmits an open / close signal S _OFF to the switch 43 and opens the switch 43. When the expression (3) is established, the calculation unit 38C transmits the open / close signal S _OFF to the switch 43 until the voltage application start time T2 elapses from the time t1 when the expression (3) is established. 43 is kept open. Then, when the voltage application start time T2 has elapsed from time t1, the calculation unit 38C transmits an open / close signal _SON to the switch 43 and closes the switch 43.

The other configuration of the display device 1C is the same as that of the display device 1A.
The display device 1C has the above-described configuration. Next, the operation and effect of the display device 1C will be described by taking as an example the case where the display device 1C is installed in a basement where sunlight does not enter.
When the basement is lit and equation (3) is not established, the viewer can clearly see the message 52 regardless of whether the first light-emitting member 14 or the second light-emitting member 15 emits light. it can.
From time t1 when the expression (3) is satisfied until the voltage application start time T2 elapses, the second light emitting member 15 does not emit light, and the first light emitting member 14 is light having a brightness of B4 or more. Continue to emit light. During this time, the viewer can clearly see the message 52 by the brightness of the light emitted by the first light emitting member 14.

When the voltage application start time T2 elapses from time t1, the brightness of the light emitted by the first light emitting member 14 does not satisfy the brightness B4. At this time, the calculation unit 38C transmits an open / close signal S _ON to the switch 43, the switch 43 is closed, and the second light emitting member 15 starts to emit light. Even after the voltage application start time T2 has elapsed from time t1, the second light emitting member 15 that emits light becomes the backlight of the first light emitting member 14, and the viewer can clearly see the message 52. During this time, the first light emitting member 14 stores again the light emitted by the second light emitting member 15 as energy.

Even after the second light emitting member 15 has finished consuming the electric power of the power storage unit 23 and the second light emitting member 15 has finished emitting light, the first light emitting member 14 continues to emit light by releasing the stored energy.
That is, even if the brightness of the illumination light is weakened or the illumination is turned off, first, the viewer can clearly see the message 52 by the brightness of the light emitted by the first light emitting member 14. When the brightness of the light emitted from the first light emitting member 14 is weakened, the second light emitting member 15 starts to emit light, and the viewer can continue to clearly see the message 52. Furthermore, since the first light emitting member 14 emits light even after the second light emitting member 15 has finished emitting light, the viewer can clearly see the message 52. Therefore, the viewer can clearly see the message 52 over a long period of time.

Other actions and effects exhibited by the display device 1C are the same as other actions and effects exhibited by the display device 1A.
Instead of B1 ≧ B2, B1> B2 can be expressed by equation (1). Moreover, B3> B4 can be made into Formula (2) instead of B3> = B4. Furthermore, instead of B1 <B2, B1 ≦ B2 can be expressed by equation (3).

  Since the display device is as described above, the display device can maintain a state in which the message of the display device can be viewed over a long period of time in a situation where it is difficult to view the message of the display device only by light from the outside. Useful as.

1A, 1B, 1C Display device 10 Translucent plate 14 First light emitting member 15 Second light emitting member 16 Organic EL light emitting layer 20 Power source 21A, 21B Solar cell 22 Light receiving surface 23 Power storage unit 27 Base material 28 Mirror surface 32A, 32B Detection Unit 36 Control unit 37A, 37B, 37C Storage unit 38A, 38B, 38C Calculation unit 39 Clock 43 Switch 48 Case 52 Message P1, P2, P3 Program B1, B2 Brightness of external light B3, B4 First light emitting member Brightness of emitted light S _ON , S _OFF switch open / close signal R Correlation t, t1 Time T1 Time T2 Voltage application start time E Integrated value of energy stored in first light emitting member

Claims (6)

A first light emitting member in which the luminous phosphor particles are held by a filler having translucency;
A second light emitting member having an organic electroluminescent light emitting layer;
A power source that emits light by applying a voltage to the organic electroluminescence light-emitting layer,
The organic electroluminescence light emitting layer of the second light emitting member is located under the first light emitting member.   The display device according to claim 1, wherein a base material having an upper surface formed of a mirror surface is located below the second light emitting member. The power source has a solar cell that receives light and performs photoelectric conversion, and a power storage unit that stores an electromotive force generated by photoelectric conversion of the solar cell,
The display device according to claim 1, wherein the power storage unit emits light by applying a voltage to the organic electroluminescence light emitting layer. A detector for detecting the brightness of light emitted by the first light emitting member;
A control unit for controlling a voltage applied to the organic electroluminescence light emitting layer from the power source,
(Brightness of light emitted by the first light emitting member detected by the detector)> (Brightness of light emitted by the first light emitting member set in advance) or (First brightness detected by the detector) The brightness of the light emitted from the light emitting member) ≧ (the brightness of the light emitted from the first light emitting member set in advance) is satisfied, the control unit is configured to control the power supply. To stop the application of voltage to the organic electroluminescence light emitting layer,
The said control part performs the application of the voltage from the said power supply to the said organic electroluminescent light emitting layer, when the said 1st condition is not materialized, Any one of the Claims 1-3 characterized by the above-mentioned. A display device according to any of the claims. A detector for detecting the brightness of external light that hits the display device;
A control unit that controls a voltage applied to the organic electroluminescence light emitting layer by the power source, and
(Brightness of outside light detected by the detector)> (Brightness of outside light detected by the detector) or (Brightness of outside light detected by the detector) ≧ (Brightness of outside light detected by the detector) When the second condition of light brightness is established, the control unit stops applying voltage from the power source to the organic electroluminescent light emitting layer,
The said control part performs the application of the voltage from the said power supply to the said organic electroluminescent light emitting layer, when the said 2nd condition is not materialized, Any one of the Claims 1-3 characterized by the above-mentioned. A display device according to any of the claims. A detector for detecting the brightness of external light that hits the display device;
A storage unit storing a correlation established between an amount of energy stored in the first light emitting member and a time during which the first light emitting member can continuously emit light having a predetermined brightness or more;
A control unit for controlling a voltage applied to the organic electroluminescence light emitting layer from the power source,
The control unit calculates an integrated value of the amount of energy stored in the first light emitting member within a preset time based on the brightness of external light detected by the detector, and the calculated integrated value and Based on the correlation, the time that the first light-emitting member can continuously emit light having a preset brightness or more is derived as a voltage application start time,
(Brightness of outside light detected by the detector) <(Brightness of outside light detected in advance) or (Brightness of outside light detected by the detector) ≦ (Preset outside light intensity) (Brightness of light) is satisfied, and the voltage application start time derived based on the integrated value at the time when the third condition is satisfied is satisfied. 4. The device according to claim 1, wherein when the time elapses, the control unit starts applying a voltage from the power source to the organic electroluminescence light emitting layer. 5. Display fixtures.

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