JP2005044732A - Light emitting device, lighting system, display device, and electronic apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a light emitting device capable of preferably enhancing luminance of output light and reducing power consumption by effectively utilizing light unused as functional light while using light which is emitted from a light emitting element and has permeated a substrate as the functional light, and to also provide a lighting system and a display device. <P>SOLUTION: This lighting system 100 is equipped with the translucent substrate 110 and the organic EL element 120 provided on the translucent substrate 110, and outputs light which is emitted from the organic EL element 120 and has permeated the translucent substrate 110 as illumination light. The system is provided with a light emitting circuit 164 to supply a driving power to the organic EL element 120, a photoelectric conversion element 150 to convert light components other than the illumination light out of the light emitted from the organic El element 120 by intercepting it after taking it out from the side end face 110a of the translucent substrate 110 to electric power, an internal charge circuit 161 to supply the electric power generated in the photoelectric conversion element 150 to the light emitting circuit 164, and a battery 162. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a light emitting device, a lighting device, a display device, and an electronic apparatus.

  2. Description of the Related Art Conventionally, light emitting devices that use light emitted from a light emitting element as functional light such as illumination light and display light are known. For example, organic EL illumination using an organic EL (electroluminescence) element as the light emitting element. Devices and organic EL display devices. The basic structure of a light-emitting device including these organic EL elements is generally a glass substrate in which the organic EL element is disposed, and is emitted from the organic EL element and transmitted through the glass substrate. Light is used as the illumination light or display light.

By the way, this type of organic EL light emitting device has a problem that the light extraction efficiency from the EL element, which is a light emitting element, is low, and power consumption increases when a bright display is obtained. This is because about 20% of the light radiated from the organic EL element is transmitted through the glass substrate, and the remaining 80% of the light propagates through the glass substrate, and most of the light is transmitted from the substrate side end. By being radiated. In view of this, Patent Documents 1 to 4 disclose techniques for effectively using light that propagates through the substrate and is emitted from the side end.
JP 2002-83667 A JP 2001-313163 A JP 2002-50467 A JP 2001-24406 A

However, all of the techniques described in Patent Documents 1 to 4 perform illumination and display using light emitted from the end surface on the substrate side, which has a large amount of light compared to light transmitted through the glass substrate. Although it is excellent in obtaining high-luminance functional light, it emits light compared to a surface-emitting type configuration that uses light emitted through a glass substrate as illumination light or display light. There is a disadvantage that the area is small and the space saving property is inferior.
Further, in a color display device in which light emitting elements of a plurality of colors are arranged in a matrix on the substrate surface, the light emitted together with the display light and radiated from the end surface on the substrate side becomes light in which the color light of each dot is mixed. It is difficult to apply each of the above technologies using light emitted from the substrate side end face as illumination light or display light.
Therefore, the present inventor can solve the problem of requiring high power consumption in order to obtain high-luminance functional light in a surface-emitting light-emitting device having a wide light-emitting area and excellent space saving. The inventors of the present invention have completed the present invention by studying that it is possible to provide a light emitting device that can be applied to a wide range of uses.

  Accordingly, an object of the present invention is to effectively use light that is radiated from a light emitting element and transmitted through a substrate as functional light, but not used as functional light, and preferably improves the brightness of output light and reduces power consumption. And a lighting device and a display device.

In order to solve the above-described problems, the present invention provides a light emitting device that outputs light from a light emitting element as functional light, element driving means for supplying driving power to the light emitting element, and emitted from the light emitting element. A photoelectric conversion unit that receives a component of light other than the functional light and converts it into electric power, and a regenerative power supply unit that supplies electric power generated by the photoelectric conversion unit to the element driving unit. Provided is a light emitting device.
According to this configuration, since the photoelectric conversion unit and the regenerative power supply unit are provided, the photoelectric conversion unit receives light components emitted from the light-emitting elements that are not used as functional light. It can be converted into electric power and supplied to the element driving means via the regenerative power supply means. As a result, it becomes possible to use the regenerative power as a part of the power for driving the element driving means or the driving power of the light emitting element, and the power consumption of the light emitting device can be substantially reduced. Therefore, even if the driving power of the light emitting element is increased in order to obtain high-luminance functional light, a part of the driving power can be supplemented by the reproduction power supplied from the photoelectric conversion means, and the same level of luminance can be obtained. Therefore, the power consumption can be reduced as compared with the conventional light emitting device.

Next, a light-emitting device of the present invention includes a light-transmitting substrate and a light-emitting element provided on the light-transmitting substrate, and functions as light emitted from the light-emitting element and transmitted through the light-transmitting substrate. A light-emitting device that outputs light, element driving means that supplies driving power to the light-emitting element, and components other than the functional light among light emitted from the light-emitting element, from one surface of the light-transmitting substrate It is characterized by comprising photoelectric conversion means for taking out, receiving light, and converting it into electric power, and regenerative power supply means for supplying electric power generated by the photoelectric conversion means to the element driving means.
The present configuration is a light emitting device that emits light from a light emitting element provided on a light transmissive substrate and transmits this light as a functional light through the light transmissive substrate. This makes it possible to effectively use the light lost in That is, after entering the translucent substrate, the light confined in the substrate by being totally reflected by the inner surface of the translucent substrate is taken out from one surface of the substrate, and the taken-out light is converted into electric power by the photoelectric conversion means. This is converted and supplied as regenerative power to the element driving means. As a result, the power for driving the element driving means or the driving power for the light emitting element

The light-emitting device of the present invention further includes power storage means capable of supplying power to the element driving means, and the regenerative power supply means supplies and stores the power generated by the photoelectric conversion means to the power storage means. It can be configured.
According to this configuration, in the light emitting device configured to be able to drive the light emitting element by the electric power supplied from the power storage unit, the regenerative power supplied from the photoelectric conversion unit can be stored in the power storage unit. Therefore, it is possible to extend the driving time of the element driving means by the power storage means and the light emitting element. According to this configuration, a light emitting device that can be preferably applied to a portable electronic device is provided.

  In the light emitting device of the present invention, it is preferable that the photoelectric conversion means and the light transmitting substrate are optically bonded. By adopting such a configuration, it is possible to prevent light emitted from the translucent substrate and received by the photoelectric conversion means from being reflected on the inner surface of the substrate when radiated from the translucent substrate. Therefore, it is possible to efficiently supply light to the photoelectric conversion means, and when multiple colors of color light are radiated from the light emitting element, color mixing by the color light propagating in the surface direction in the substrate Can be prevented.

In the light emitting device of the present invention, the photoelectric conversion means may be optically bonded to the side end surface of the translucent substrate. Or the said photoelectric conversion means can be set as the structure optically adhere | attached with the light emitting element arrangement | positioning surface of the said translucent board | substrate, and / or the surface on the opposite side.
According to these configurations, when the light propagating in the surface direction from the side end surface or main surface of the translucent substrate is extracted, the propagation light is prevented from being reflected by the inner surface of the translucent substrate. be able to.

  In the light emitting device of the present invention, the photoelectric conversion means includes a photoelectric conversion element having a light receiving surface, and the light receiving surface of the photoelectric conversion element and the surface of the translucent substrate are disposed substantially parallel to each other. It can be set as the structure currently made. According to this configuration, light propagating in the surface direction in the substrate can be efficiently incident on the light receiving surface of the photoelectric conversion element. And since a photoelectric conversion element is directly arrange | positioned with respect to a translucent board | substrate, the advantage that size reduction and thickness reduction of a light-emitting device become easy is also acquired.

  In the light emitting device of the present invention, the photoelectric conversion means includes a photoelectric conversion element having a light receiving surface, and a light guide means provided between the light receiving surface and the translucent substrate. it can. According to this configuration, by using the light guide unit, the light emitted from the translucent substrate can be guided to the photoelectric conversion element provided at an arbitrary position. It is possible to flexibly change the mounting form in accordance with the shape and size of the device to be mounted. Thereby, there are few restrictions at the time of mounting in another apparatus, Therefore The light-emitting device with a wide application range can be provided.

  In the light-emitting device of the present invention, the light guide means is a light guide member that guides light emitted from the side end surface of the translucent substrate to the light receiving surface of the photoelectric conversion element while reflecting the light from the reflection element. It can be. With this configuration, light can be easily guided to the photoelectric conversion element provided at an arbitrary position, and a light-emitting device having excellent flexibility in mounting on other devices can be easily provided.

  In the light emitting device of the present invention, an antireflection film is preferably formed on the front side of the light receiving surface of the photoelectric conversion element. This configuration is an effective configuration for maintaining the quality of functional light in a light emitting device in which the light emitting element is configured to be capable of emitting a plurality of colored lights. That is, in a light emitting device in which a plurality of colored lights are provided as functional light, color mixing between colored lights is not preferable because it changes the chromaticity and saturation of the functional light and lowers the quality. Therefore, if this configuration is applied, the anti-reflection film provided on the light receiving surface can prevent light incident on the photoelectric conversion element from being reflected and returned to the substrate, so that the above color mixture can be effectively prevented. High quality functional light can be provided.

  In the light emitting device of the present invention, the light emitting element may be an organic electroluminescent element. This invention can be set as the structure provided with the organic electroluminescent element formed by laminating | stacking an organic light emitting layer on a translucent board | substrate. According to these configurations, a surface-emitting EL light-emitting device with low power consumption can be provided.

  Next, an illumination device according to the present invention includes the light emitting device described above, and uses light emitted from the light emitting element as illumination light. According to this configuration, light that is not used as illumination light can be converted into electric power by the photoelectric conversion means and reused as drive power for the element driving means or the light emitting element, thereby providing a lighting device with low power consumption. can do.

  Next, a display device according to the present invention includes the previous illumination device and a light modulation unit that modulates illumination light output from the illumination device. According to this configuration, it is possible to provide a display device that includes the illumination device as a light source and has reduced power consumption of the light source.

  Next, a display device of the present invention includes the above-described light emitting device, and uses light emitted from the light emitting element as display light. According to this configuration, a display device with low power consumption is provided.

  The display device of the present invention may be configured such that a plurality of the light emitting elements are arranged on the translucent substrate and display is performed with each light emitting element as one display unit. According to this configuration, it is possible to provide a display device that can display with a combination of a plurality of pixels and has low power consumption.

Next, an electronic apparatus according to the present invention includes the light-emitting device described above. In addition, as the electronic apparatus of the present invention, a configuration including the display device described above can be applied.
According to this configuration, an electronic device including a light-emitting unit or a display unit with low power consumption is provided.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
(First embodiment)
FIG. 1 is a perspective configuration diagram of a lighting device including a light emitting device according to the present invention as a basic configuration, and FIG. 2 is a cross-sectional configuration diagram along line AA ′ in FIG. The illumination device 100 shown in FIGS. 1 and 2 was exhibited on a substrate (translucent substrate) 110, an organic EL element (light emitting element) 120 formed on the substrate 110, and the organic EL element 120. The sealing member 130 is mainly used, and a photoelectric conversion element (photoelectric conversion means) 150 disposed on one end face of the substrate 110 is provided. The lighting device 100 is a so-called bottom emission type that emits emitted light from the substrate 110 side.

  The organic EL element 120 provided on the substrate 110 has a configuration in which an anode 121a, a hole injection layer 122, a light emitting layer 123, and a cathode 124 are sequentially stacked on the substrate 110. An electrode portion 121b made of the same material is provided in the same layer as the anode 121a, and is electrically connected to the cathode 124 provided in the uppermost layer as shown in FIG.

The substrate 110 is a light-transmitting substrate such as transparent glass or quartz so as to transmit and emit emitted light.
The anode 121a is also formed of a transparent conductive material in order to transmit light emitted from the light emitting layer 123 as will be described later. ITO is used as the transparent conductive material. Further, the surface of the ITO (anode 121a) is subjected to an O ₂ plasma treatment as necessary, whereby the electrode surface is cleaned and the work function is adjusted, and the lyophilic property is further improved. It is to be granted.
As shown in the drawing, the anode 121a is electrically connected to a light emitting circuit (element driving means) 164 for driving and controlling the organic EL element 120.

  The hole injection layer 122 formed and arranged on the anode 121a is formed, for example, from a polythiophene derivative added with polystyrene sulfonic acid. That is, specifically, polyethylenedioxythiophene / polystyrene sulfonic acid or the like is suitably used as a material for forming the hole injection layer 122.

  The material for forming the hole injection layer 122 is not limited to the above, and various materials can be used. For example, a material obtained by dispersing polystyrene, polypyrrole, polyaniline, polyacetylene or a derivative thereof together with the above-described polystyrene sulfonic acid in an appropriate dispersion medium can be used.

The light emitting layer 123 is formed of a known light emitting material capable of emitting fluorescence or phosphorescence, and a white light emitting material is preferably used when used as a general-purpose lighting device.
In addition, as a material for forming the light emitting layer 123, a light emitting material made of a low molecular material may be used. However, when the light emitting layer 123 is formed of a low molecular material, the organic EL element 120 is preferably formed by laminating a hole transport layer, a light emitting layer, and an electron transport layer in this order from the anode 121a side. The hole transporting layer is formed of a hole transporting material such as α-NPD or TPD, or a stacked structure of a hole injection material using a starburst amine system and the hole transporting material. It is preferable to do this. In addition, as the low molecular weight material forming the light emitting layer, for example, a system in which an electron transporting light emitting material such as Alq3 (aluminum chelate complex) is doped with a small amount of a fluorescent dye (rubrene, quinacridone, DCM, or the like) is used. Furthermore, as the electron transport layer, for example, Alq3 or PBD is used.

  When a polymer material is used as the light emitting material, a nonpolar solvent in which the hole injection layer 122 is insoluble is used as a solvent for liquefying the polymer material so that the hole injection layer 122 is not redissolved. In particular, when the light emitting layer forming material is applied by spin coating or dipping as will be described later, toluene, xylene, or the like is preferably used as the nonpolar solvent. In addition, when applying by a droplet discharge method such as an ink jet method, dihydrobenzofuran, trimethylbenzene, tetramethylbenzene, cyclohexylbenzene, or a mixture thereof is used.

The cathode 124 can be composed of a metal electrode made of magnesium, calcium, or the like.
As shown in FIG. 2, the cathode 124 is electrically connected to the light emitting circuit 164 via an electrode portion 121b provided in the same layer as the anode 121a.

  On each layer laminated on the substrate 110 in this manner, a sealing member 130 is provided so as to cover the organic EL element 120 composed of these layers. As the sealing member 130, for example, a plate-shaped sealing substrate having electrical insulation is used. When a sealing substrate is used, the sealing substrate is fixed to the substrate 110 with a sealing resin while covering the organic EL element 120. As the sealing resin, for example, a thermosetting resin or an ultraviolet curable resin is used, and in particular, an epoxy resin which is a kind of thermosetting resin is preferably used. Alternatively, only the sealing resin may be used without using the sealing substrate, and the organic EL element may be covered and sealed.

In the lighting device 100 of the present embodiment, the photoelectric conversion element 150 is provided on the side end surface on the right side of the substrate 110 in the drawing, and the light receiving surface 151 is disposed to face the side end surface 110a of the substrate 110 substantially in parallel. ing. As the photoelectric conversion element 150, a known element can be used. For example, any photoelectric conversion element using single crystal / polycrystalline silicon, amorphous silicon, a compound semiconductor, an organic semiconductor, or the like can be applied.
In addition, the light receiving surface 151 of the photoelectric conversion element 150 and the side end surface 110a of the substrate 110 are preferably optically bonded with a transparent resin material or the like. By adopting such a configuration, an interface at the side end surface 110a is provided. The reflection can be effectively prevented, and the light irradiation efficiency to the light receiving surface 151 can be increased.
As shown in FIG. 2, the photoelectric conversion element 150 has an internal charging circuit (regenerative power supply means) 161 connected to a battery (power storage means) 162 connected to a light emitting circuit (element drive means) 164 that drives the organic EL element 120. And an external charging circuit 163 is electrically connected to the battery 162. That is, the battery 162 can be charged by either the external charging circuit 163 or the internal charging circuit 161.

In the lighting device 100 of the present invention having the above-described configuration, when the power supplied from the battery 162 is applied to the anode 121a and the cathode 124 of the organic EL element 120 by the light emitting circuit 164, the light emitting layer 123 emits light and the organic EL element 120 is emitted. The light is emitted from. The light emitted through the substrate 110 can be used as illumination light.
Here, FIG. 3 is a cross-sectional configuration diagram for explaining the operation of the illumination device 100. When the organic EL element 120 emits light, as shown in FIG. 3, illumination light L1 that is radiated through the substrate 110 is obtained. At the same time, after being emitted from the organic EL element 120 and incident on the substrate 110 The light L2 that is totally reflected on the inner surface of the substrate 110 and propagates in the direction of the substrate surface is generated.
In the illuminating device 100 of the present embodiment, light that propagates in the direction of the substrate surface and is emitted from the substrate-side end surface 110a is detected by the photoelectric conversion element 150, and the electric power generated by the photoelectric conversion element 150 by this light receiving operation. Is stored in the battery 162 by the internal charging circuit 161. The electric power can be supplied again to the light emitting circuit 164 connected to the battery 162 and the organic EL element 120.

  As described above, in the illumination device 100 of the present embodiment, a component that is radiated from the organic EL element 120 but is not used as illumination light (light radiated from the substrate-side end surface 110a without passing through the substrate 110) is again generated. By accumulating in the battery 162, the capacity of the battery 162 can be substantially increased. Thereby, the power consumption of the illuminating device 100 can be substantially reduced, and even if the driving current of the organic EL element 120 is increased to obtain illumination light with high brightness, the battery is driven as compared with the conventional illuminating device. It is possible to lengthen the time.

  In addition, since the illumination device 100 according to the present embodiment is a surface-emitting illumination device that uses the light L1 emitted through the substrate 110 as illumination light, the back of the panel is directly used as a backlight such as a liquid crystal panel. Can be arranged. That is, a light guide plate or the like for obtaining planar light emission is unnecessary, and the manufacturing cost is reduced, as compared with the illumination devices described in Patent Documents 1 to 4 using light emitted from the substrate side end surface as illumination light. In addition, space saving can be realized by reducing the flat area of the lighting device.

In the first embodiment, the configuration in which the photoelectric conversion element 150 is provided only on one side end face 110a of the substrate 110 has been described. However, as illustrated in FIG. 4, all four side end faces of the substrate 110 are provided. The photoelectric conversion elements 150a to 150d may be arranged. Also in this case, each of the photoelectric conversion elements 150a to 150d is disposed with its light receiving surface facing the side end surface of the substrate 110, and is preferably optically bonded to the substrate 110 with a transparent resin material or the like.
According to the above configuration, light emitted from the end face on the substrate 110 side can be received by the photoelectric conversion elements 150a to 150d very efficiently, the amount of electricity stored in the battery 162 can be improved, and the substantial amount of the organic EL element 120 can be substantially reduced. Power consumption can be further reduced.
Moreover, in the said embodiment, although the example using the organic EL element (organic electroluminescent element) as a light emitting element was demonstrated, as a light emitting element, an LED (light emitting diode) element, an inorganic EL element, a field emission light emitting element, A plasma light emitting element or the like can also be suitably used.

(Second Embodiment)
Next, a second embodiment of the present invention will be described with reference to FIG.
FIG. 5 is a cross-sectional configuration diagram showing the illumination device 200 of the present embodiment. The illuminating device 200 has a basic configuration similar to that of the illuminating device 100 of the first embodiment, and is characterized by an optical connection structure between the substrate 110 and the photoelectric conversion element 150. That is, the lighting device 200 includes an organic EL element 120 formed on the substrate 110, a sealing member 130 that seals the organic EL element 120, and a photoelectric conversion element 150. The light guide member (light guide means) 170 is disposed on the side end face 110 a of the substrate 110.
In FIG. 5, the same components as those in FIG. 2 are denoted by the same reference numerals, and detailed description thereof is omitted.

As shown in FIG. 5, the light guide member 170 is a light transmission member having a substantially triangular prism shape, and a reflective film 171 is provided on an inclined surface forming one outer surface thereof. Of the remaining two outer surfaces, one outer surface and the side end surface 110a of the substrate 110 are optically bonded, and the other outer surface and the light receiving surface 151 of the photoelectric conversion element 150 are optically bonded. A transparent resin material or the like can be used for the optical bonding of each surface.
According to the illuminating device 200 of the present embodiment having the above-described configuration, the light that is totally reflected by the inner surface of the substrate 110 and propagates in the direction of the substrate surface and is emitted from the side end surface 110a of the substrate 110 is transmitted via the light guide member 170. Thus, the light can be guided to the photoelectric conversion element 150 disposed substantially parallel to the substrate 110. Therefore, the photoelectric conversion element 150 having a thin planar shape can be disposed substantially parallel to the substrate 110, and the lighting device can be thinned.

Also in the illumination device 200 of the present embodiment, it is needless to say that the light guide member 170 and the photoelectric conversion element 150 can be disposed on all four side end portions of the substrate 110 as shown in FIG. .
The light guide member 170 may have a condensing function so as to condense the light emitted from the substrate side end portion 110 a and irradiate the photoelectric conversion element 150. With such a configuration, the photoelectric conversion element 150 can be downsized, and the configuration contributes to downsizing of the lighting device 200.

(Third embodiment)
Next, a third embodiment of the present invention will be described with reference to FIG.
FIG. 6 is a cross-sectional configuration diagram of an organic EL display device including the light emitting device according to the present invention as a basic configuration. Among the constituent elements shown in the figure, constituent elements denoted by the same reference numerals as those in FIGS. 1 to 5 have the same configuration as the constituent elements shown in these drawings, and will be described in detail below. Will be omitted.

The organic EL display device 300 includes a substrate 110, a plurality of organic EL elements (light emitting elements) 120 provided on the substrate 110, and a sealing member 130 that seals these organic EL elements 120. The photoelectric conversion element 150 is provided on one side end face 110 a of the substrate 110 via a light guide member 170. A drive circuit (element drive means) 184 electrically connected to each of the organic EL elements 120 is provided, and a battery (power storage means) 182 is connected to the drive circuit 184. An internal charging circuit (regenerative power supply means) 181 and an external charging circuit 183 are electrically connected to the battery 182, and the internal charging circuit 181 is electrically connected to the photoelectric conversion element 150.
In addition, an antireflection film 152 is provided on the light receiving surface 151 of the photoelectric conversion element 150 provided in the organic EL display device 300 of the present embodiment, and light incident on the photoelectric conversion element 150 is reflected toward the substrate 110 side. It is designed to prevent this from happening.

Each organic EL element 120 has a configuration in which an anode 121, a hole injection layer 122, a light emitting layer 123, and a cathode 124 are sequentially stacked from the substrate 110 side. As shown in FIG. The light emitting layer 123 of the organic EL elements 120... Arranged above is composed of light emitting layers of three colors of red (R), green (G), and blue (B). These red, green, and blue organic EL elements 120 (dots) constitute one pixel of the organic EL display device 300.
Corresponding to each organic EL element 120, a switching element such as a TFT (thin film transistor) is provided, and each dot (organic EL element 120) is driven in an active matrix by the switching element.
In FIG. 6, the organic EL elements 120 are arranged so as to be spaced apart from each other in a plan view. However, a partition that partitions the organic EL elements 120 may be provided between the organic EL elements 120 and 120. Good. The organic EL elements 120... Constituting each pixel may be driven by a simple matrix method.

The organic EL display device 300 having the above-described configuration displays a color image by turning on any dot by supplying power from the battery 182 to each organic EL element 120 arranged in a matrix by the drive circuit 184. Be able to. Then, the light L2 propagating in the substrate surface direction generated along with the emission of the display lights L (R), L (G), and L (B) radiated through the substrate 110 is transmitted from the substrate-side end surface 110a to the light guide 170. To the photoelectric conversion element 150. The electric power generated in the photoelectric conversion element 150 by this light receiving operation is accumulated in the battery 182 via the internal charging circuit 181 and is resupplied to the organic EL elements 120... Via the driving circuit 184.
In this way, the organic EL device 300 of the present embodiment can extend the battery driving time, and can reduce the substantial power consumption of the organic EL elements 120. Further, even if the drive current of the organic EL elements 120... Is increased in order to increase the display brightness, a longer battery drive time can be obtained compared to the conventional case.

  Furthermore, in the organic EL display device 300 of the present embodiment, the antireflection film 152 is provided on the light receiving surface 151 of the photoelectric conversion element 150, so that the display quality is reduced due to the light L2 propagating in the substrate surface direction. It can be prevented. In the organic EL display device 300, the light emitted from the substrate-side end face 110a is a mixed-color light in which the light emitted from the organic EL elements 120 of a plurality of colors is mixed. Therefore, the mixed-color light returns into the substrate 110. If the display light L is mixed with colors, the display quality may be deteriorated. Thus, by providing the antireflection film 152 on the light receiving surface 151 of the photoelectric conversion element 150, it is possible to prevent the light incident on the photoelectric conversion element 150 from returning to the substrate 110 side, thereby improving the display quality due to color mixing. A decrease can be prevented.

  Thus, according to the organic EL display device 300 of the present embodiment, a substantial reduction in power consumption can be realized, and display by the light L2 that is totally reflected on the inner surface of the substrate 110 and propagates in the direction of the substrate surface. Color mixing with light can be prevented and high-quality color display can be obtained.

(Fourth embodiment)
Next, a fourth embodiment of the present invention will be described with reference to FIG.
FIG. 4 is a cross-sectional configuration diagram of an organic EL display device including the light emitting device according to the present invention as a basic configuration. Among the constituent elements shown in the figure, constituent elements denoted by the same reference numerals as those in FIGS. 1 to 6 have the same configuration as the constituent elements shown in these drawings, and will be described in detail below. Will be omitted.

The organic EL display device 400 includes a substrate 110, a plurality of organic EL elements (light emitting elements) 120 provided on the substrate 110, and a sealing member 130 that seals these organic EL elements 120. The two photoelectric conversion elements 150 and 150 are provided on both surfaces of the substrate 110 which are configured and protrude from the formation region of the organic EL elements 120. These photoelectric conversion elements 150 and 150 are arranged with their light receiving surfaces 151 and 151 facing the substrate 110 and are optically bonded to the substrate 110.
In addition, a drive circuit 184 electrically connected to each of the organic EL elements 120 is provided, and a battery 182 is connected to the drive circuit 184. An internal charging circuit 181 and an external charging circuit 183 are electrically connected to the battery 182, and the internal charging circuit 181 is electrically connected to the photoelectric conversion elements 150 and 150.

Each organic EL element 120 has a configuration in which an anode 121, a hole injection layer 122, a light emitting layer 123, and a cathode 124 are sequentially stacked from the substrate 110 side. As shown in FIG. The light emitting layer 123 of the organic EL elements 120... Arranged above is composed of light emitting layers of three colors of red (R), green (G), and blue (B). These red, green, and blue organic EL elements 120 (dots) constitute one pixel of the organic EL display device 400.
Corresponding to each organic EL element 120, a switching element such as a TFT (thin film transistor) is provided, and each dot (organic EL element 120) is driven in an active matrix by the switching element.
7, the organic EL elements 120 are arranged so as to be spaced apart from each other in a planar manner. However, a partition wall that partitions the organic EL elements 120 is provided between the organic EL elements 120 and 120. It is good also as a structure. The organic EL elements 120... Constituting each pixel may be driven by a simple matrix method.

The organic EL display device 400 having the above-described configuration displays a color image by supplying power from the battery 182 to the organic EL elements 120 arranged in a matrix by the drive circuit 184 to light any dot. Be able to. Then, the light L2 propagating in the direction of the substrate surface generated along with the emission of the display lights L (R), L (G), and L (B) emitted through the substrate 110 is transmitted from the surface of the region on the side of the substrate 110. The light is guided to the photoelectric conversion element 150. The electric power generated in the photoelectric conversion element 150 by this light receiving operation is accumulated in the battery 182 via the internal charging circuit 181 and is resupplied to the organic EL elements 120... Via the driving circuit 184.
In this way, the organic EL display device 400 of this embodiment can extend the battery driving time, and can reduce the substantial power consumption of the organic EL elements 120. Moreover, even if the drive current of the organic EL elements 120.

  In the organic EL display device 400 of the present embodiment, the photoelectric conversion elements 150 and 150 are provided not on the side end face of the substrate 110 but on the surface of the substrate 110 protruding laterally from the formation region of the organic EL elements 120. . Thus, by directly bonding the photoelectric conversion elements 150 and 150 to the substrate 110, the manufacturing cost is reduced by reducing the number of parts, the manufacturing efficiency is improved by improving the ease of the assembly process, and the organic EL device 400 Thinning can be realized.

(Electronics)
FIG. 8 is a perspective view showing an example of an electronic apparatus according to the present invention. A cellular phone 1300 shown in this figure includes a display device provided with the illumination device according to the first and second embodiments, or a display device according to the third and fourth embodiments as a small-size display unit 1301, and a plurality of operations. A button 1302, an earpiece 1303, and a mouthpiece 1304 are provided.
The display device of each of the above embodiments is not limited to the above mobile phone, but a projector, an electronic book, a personal computer, a digital still camera, a liquid crystal television, a viewfinder type or a monitor direct view type video tape recorder, a car navigation device, a pager, It can be suitably used as an image display means for electronic notebooks, calculators, word processors, workstations, videophones, POS terminals, touch panel-equipped devices, etc. The display is bright and low power consumption for any electronic device The display unit can be provided.

FIG. 1 is a perspective configuration diagram of a lighting device according to a first embodiment. FIG. 2 is a cross-sectional configuration diagram taken along the line A-A ′ of FIG. 1. FIG. 3 is a cross-sectional configuration diagram for explaining the operation of the illumination device of the first embodiment. FIG. 4 is a plan configuration diagram illustrating a modified example of the illumination device according to the first embodiment. FIG. 5 is a cross-sectional configuration diagram of the illumination device according to the second embodiment. FIG. 6 is a cross-sectional configuration diagram of a display device according to a third embodiment. FIG. 7 is a cross-sectional configuration diagram of a display device according to a fourth embodiment. FIG. 8 is a perspective configuration diagram illustrating an example of an electronic apparatus.

Explanation of symbols

  100,200 Illumination device (light emitting device), 300,400 Organic EL display device (light emitting device), 110 substrate (translucent substrate), 110a side end surface, 120 organic EL element (light emitting device), 150, 150a to 150d Conversion element (photoelectric conversion means), 152 antireflection film, 170 light guide member, 171 reflection film, 161, 181 internal charging circuit (power storage means), 162, 182 battery (power storage means), 164 light emitting circuit (power supply means) 184 Drive circuit (power supply means)

Claims (17)

A light emitting device that outputs light from a light emitting element as functional light,
Element driving means for supplying driving power to the light emitting element;
Photoelectric conversion means for receiving a component other than the functional light out of the light emitted from the light emitting element and converting it into electric power;
And a regenerative power supply means for supplying power generated by the photoelectric conversion means to the element driving means. A light-emitting device that includes a light-transmitting substrate and a light-emitting element provided on the light-transmitting substrate, outputs light emitted from the light-emitting element and transmitted through the light-transmitting substrate as functional light,
Element driving means for supplying driving power to the light emitting element;
A component other than the functional light out of the light emitted from the light emitting element is extracted from one surface of the translucent substrate and received, and converted into electric power; and
Regenerative power supply means for supplying electric power generated by the photoelectric conversion means to the element driving means. The battery further comprises power storage means capable of supplying power to the element driving means,
The light-emitting device according to claim 1, wherein the regenerative power supply unit supplies the electric power generated by the photoelectric conversion unit to the power storage unit and stores the electric power. The light emitting device according to claim 2, wherein the photoelectric conversion unit is optically bonded to the translucent substrate. The light emitting device according to claim 4, wherein the photoelectric conversion means is optically bonded to a side end surface of the translucent substrate. The light emitting device according to claim 4, wherein the photoelectric conversion means is optically bonded to a light emitting element arrangement surface of the translucent substrate and / or a surface on the opposite side. The photoelectric conversion means includes a photoelectric conversion element having a light receiving surface,
The light-emitting device according to claim 2, wherein a light-receiving surface of the photoelectric conversion element and a surface of the light-transmitting substrate are disposed to face each other substantially in parallel. The photoelectric conversion means includes a photoelectric conversion element having a light receiving surface, and light guide means provided between the light receiving surface and the translucent substrate. The light emitting device according to claim 1. 9. The light guide member is a light guide member that guides light emitted from a side end surface of the translucent substrate to a light receiving surface of the photoelectric conversion element while being reflected by a reflection element. The light emitting device according to 1. The light emitting device according to claim 7, wherein an antireflection film is formed on a front surface side of the light receiving surface of the photoelectric conversion element. The light emitting device according to any one of claims 1 to 10, wherein the light emitting element is an organic electroluminescent element. An illumination device comprising the light-emitting device according to claim 1, wherein light emitted from the light-emitting element is used as illumination light. 13. A display device comprising: the illumination device according to claim 12; and a light modulation unit that modulates illumination light output from the illumination device. A display device comprising the light emitting device according to claim 1, wherein light emitted from the light emitting element is used as display light. The display device according to claim 14, wherein a plurality of the light emitting elements are arranged on the translucent substrate and display is performed with each light emitting element as one display unit. An electronic apparatus comprising the light emitting device according to claim 1. An electronic apparatus comprising the display device according to claim 13.

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