JP6967445B2 - OLED panel - Google Patents

Description

The present invention relates to an OLED (organic LED) panel, and more particularly to an OLED panel having light transmission and emitting light of different hues from each of both sides.

Conventionally, as an EL display element having transparency, there is an EL display element having a configuration disclosed in Patent Document 1.

In the disclosed EL display element, both sides of the organic light emitting layer are sandwiched between a transparent electrode layer made of an ITO film or the like and an ultrathin transparent electrode layer made of a material having a low work function and high electron injection efficiency into the organic light emitting layer. At the same time, a transparent electrode film made of an ITO film or the like is formed on the transparent electrode layer of an ultra-thin film to form an element portion having a multilayer structure, and the element portion is sealed with a transparent substrate and a transparent cover to form an inert gas inside. It has a structure in which it is housed in an airtight space filled with nitrogen gas and the like.

By arranging the EL display element having the above configuration by attaching it to the back (rear) window glass of the vehicle, for example, the rear visibility from the driver is not deteriorated and the visibility from the following vehicle is improved. At the same time, various warning displays such as a stop lamp display can be performed.
Since the transparency of the EL display element is ensured even during light emission, the field of view of the back (rear) window is not obstructed by the EL display element even during light emission. ..

Japanese Unexamined Patent Publication No. 11-198720

By the way, the above EL display element, which is attached to the back (rear) window glass of the vehicle and has a stop lamp function, has transparency, so that the red light of the stop display is emitted to the vehicle interior side when it is lit. There is a possibility that the light will be emitted from the vehicle interior toward the front of the vehicle.

By the way, by law, it is prohibited to irradiate light of a specific color such as red light toward the front of the vehicle, and the EL display element having the above configuration may violate the law depending on the amount of irradiation light at the time of lighting.

Further, when the EL display element is attached to the side glass of the vehicle and arranged to have a turn signal lamp function, orange light at the time of lighting is emitted to the vehicle interior side and is transmitted through the other side glass facing the vehicle. It is irradiated toward the side. Therefore, when the vehicle is viewed from the side, it may not be possible to determine whether the left or right turn signal lamp is lit, or the determination may be erroneous and the safety may be impaired.

Further, chromatic light such as red light and orange light may cross the vehicle interior, which may hinder the driver's driving.

Therefore, the present invention has been invented in view of the above problems, and an object of the present invention is to provide an OLED panel having light transmission and emitting light of different hues from both sides, for example, a vehicle. Even if it is attached to the window glass of the vehicle, it does not violate the regulations when it is lit, it does not hinder the driver's driving when it is lit, and it does not obstruct the view to the outside of the vehicle and hinders visibility. Realize a vehicle lamp that never happens.

In order to solve the above problems, in the invention described in claim 1 of the present invention, a transparent anode electrode film and a transparent cathode electrode film are formed on both sides of a first light emitting layer made of an organic light emitting layer that emits light from both sides. It is provided with a first light emitting portion formed of a transparent anode electrode film and a second light emitting portion formed of a transparent anode electrode film and a transparent cathode electrode film on both sides of a second light emitting layer composed of an organic light emitting layer that emits light from both sides . The first light emitting unit and the second light emitting unit overlap each other with their transparent cathode electrode films facing each other, and the first light emitting unit and the second light emitting unit emit light having different hues from each other. In both the first light emitting section and the second light emitting section, the transparent cathode electrode film has a higher light transmittance than the transparent cathode electrode film, and the first light emitting section and the second light emitting section overlap each other. It is characterized by being integrated by.

Further, the invention according to claim 2 of the present invention is characterized in that, in claim 1 , a transparent solid layer is arranged between the transparent cathode electrode films.

Further, the invention according to claim 3 of the present invention is characterized in that, in either claim 1 or 2 , the first light emitting layer and the second light emitting layer have different amounts of light emitted from each other. It is something to do.

Further, in the invention described in claim 4 of the present invention, in any one of claims 1 to 3 , the first light emitting layer and the second light emitting layer have hues of light having a complementary color relationship with each other. It is characterized by emitting.

Further, the invention according to claim 5 of the present invention is characterized in that, in claim 2 , a gas layer is provided at an intermediate position of the transparent solid layer.

The invention according to claim 6 of the present invention is characterized in that, in claim 5 , the gas layer is an inert gas or air .

Further, in the invention described in claim 7 of the present invention, in any one of claims 1 to 6 , the light emission on the light emitting surface side where the first light emitting layer and the second light emitting layer do not overlap each other overlaps. It is characterized in that the light emission is stronger than that on the light emitting surface side.

Further, the invention according to claim 8 of the present invention is a vehicle lamp body attached to a window portion of a vehicle, and transparent anode electrodes are provided on both sides of a first light emitting layer made of an organic light emitting layer that emits light from both sides. A first light emitting unit formed of a film and a transparent cathode electrode film and a translucent second light emitting unit that emits light from both sides are provided, and the first light emitting unit and the second light emitting unit are mutually aligned with each other. Light that serves as a complementary color is emitted, and the first light emitting unit and the second light emitting unit are integrated by overlapping, and the light emitted from the first light emitting unit is relatively weak toward the second light emitting unit side. Light is emitted relatively strongly on the facing surface side, and in the second light emitting unit, the combined color of the light emitted from the first light emitting unit and the light emitted from the second light emitting unit emitted from the second light emitting unit side is white. In addition, the combined color of the light emitted from the first light emitting unit and the light emitted from the second light emitting unit emitted from the first light emitting unit side is different from that of white, so that the light is emitted with a smaller amount of light emitted than the first light emitting unit. It is characterized in that the surface on the side of the second light emitting portion is composed of an OLED panel attached to the window portion.

According to the present invention, the OLED panel is composed of a first light emitting portion in which a transparent anode electrode film and a transparent cathode electrode film are formed on both sides of the first light emitting layer, and light having a different hue from that of the first light emitting layer. The second light emitting portion, in which the transparent anode electrode film and the transparent cathode electrode film are formed on both sides of the second light emitting layer that emits light, is integrally arranged so as to face each other with the cathode electrode films facing each other. ..

As a result, an OLED panel that has light transmission and emits light of different hues from both sides is realized, and even if this OLED panel is attached to the window glass of a vehicle, for example, it does not violate the regulations when lit and is lit. It is possible to realize a vehicle lamp that does not sometimes hinder the driver's driving, does not obstruct the view to the outside of the vehicle, and does not hinder the visibility.

It is sectional drawing of the OLED panel of 1st Embodiment which concerns on this invention. It is a figure when a voltage is applied to an OLED panel. It is a figure which shows the transition state of the amount of light in an OLED panel. It is a figure which shows the attachment state of the OLED panel to the rear window glass of a vehicle. It is a detailed view of part A of FIG. It is a figure which shows the transition state of the amount of light in an OLED panel. It is a figure which shows the attachment state of the OLED panel to the side window glass of a vehicle. It is a detailed view of part B of FIG. It is sectional drawing of the OLED panel of the 2nd Embodiment which concerns on this invention. It is sectional drawing of the OLED panel of the 3rd Embodiment which concerns on this invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to FIGS. 1 to 10 (the same parts are designated by the same reference numerals). Since the embodiments described below are suitable specific examples of the present invention, various technically preferable limitations are added, but the scope of the present invention particularly limits the present invention in the following description. Unless otherwise stated, the present invention is not limited to these embodiments.

FIG. 1 is a schematic cross-sectional view showing a first embodiment of the OLED panel of the present invention.

In the OLED (organic LED) panel 1 of the first embodiment, the first organic light emitting layer (hereinafter, abbreviated as the first light emitting layer) 10 and the second organic light emitting layer 20 each emit light having different hues from each other. The two light emitting layers have a configuration in which they are arranged so as to face each other at a predetermined distance.

The first organic light emitting layer (hereinafter, abbreviated as the first light emitting layer) 11 is composed of an organic layer that emits red light assuming that the OLED panel 1 is used for a vehicle lamp (for example, a tail lamp). ..

A transparent anode electrode film made of ITO (hereinafter, abbreviated as the first anode electrode film) 12 is formed on the anode-side surface of the first light emitting layer 11, and MgAg, Mg or Ag is formed on the cathode-side surface. A transparent cathode electrode film (hereinafter, abbreviated as the first cathode electrode film) 13 is formed, and the first light emitting portion 10 is formed by the first light emitting layer 11, the first anode electrode film 12, and the first cathode electrode film 13. It is configured.

The second organic light emitting layer (hereinafter, abbreviated as the second light emitting layer) 21 emits blue-green (cyan) light which is a complementary color of red light emitted from the first light emitting layer 11 of the first light emitting unit 10. It is composed of layers.

A transparent anode electrode film made of ITO (hereinafter, abbreviated as the second anode electrode film) 22 is formed on the anode side surface of the second light emitting layer 21, and MgAg, Mg or Ag is formed on the cathode side surface. A transparent cathode electrode film (hereinafter, abbreviated as a second cathode electrode film) 23 is formed, and the second light emitting portion 20 is formed by the second light emitting layer 21, the second anode electrode film 22, and the second cathode electrode film 23. It is configured.

The first light emitting unit 10 and the second light emitting unit 20 are overlapped and arranged to face each other with a transparent solid layer 30 having an appropriate thickness interposed therebetween, via the first cathode electrode film 13 and the second cathode electrode film 23, respectively. .. The transparent solid layer 30 is arranged so that one surface is in contact with the first cathode electrode film 13 of the first light emitting unit 10 and the other surface is in contact with the second cathode electrode film 23 of the second light emitting unit 20.

As a result, the OLED panel 1 is integrally formed by the first light emitting unit 10, the second light emitting unit 20, and the transparent solid layer 30. The first light emitting unit 10, the second light emitting unit 20, and the transparent solid layer 30 all have translucency with respect to visible light.

Therefore, when an appropriate voltage (V1) is applied between the first anode electrode film 12 and the first cathode electrode film 13 of the first light emitting unit 10 (see FIG. 2), the red light emitted by the first light emitting layer 11 is emitted. Is transmitted through each of the first anode electrode film 12 and the first cathode electrode film 13 and emitted to both sides of the first light emitting unit 10.

Similarly, when an appropriate voltage (V2) is applied between the second anode electrode film 22 and the second cathode electrode film 23 of the second light emitting unit 20 (see FIG. 2), the blue light emitted by the second light emitting layer 21 is emitted. Green light passes through each of the second anode electrode film 22 and the second cathode electrode film 23 and is emitted to both sides of the second light emitting unit 20.

At this time, the first anode electrode film 12 and the first cathode electrode film 13 of the first light emitting unit 10 are formed by setting the film thickness based on the optical characteristics of the materials forming the first anode electrode film 12. It is designed to have a higher light transmittance than that of the first cathode electrode film 13. Specifically, the ratio of the light transmittance between the first anode electrode film 12 and the first cathode electrode film 13 is set to be, for example, 7: 3 to 6: 4.

As a result, the light (red light) emitted from the first light emitting layer 11 of the first light emitting unit 10 toward both sides with a substantially equal amount of light passes through the first anode electrode film 12 and the first cathode electrode film 13. As a result, the ratio of the amount of transmitted light becomes 7: 3 to 6: 4.

Similarly, the second anode electrode film 22 and the second cathode electrode film 23 of the second light emitting unit 20 are formed by setting the film thickness based on the optical characteristics of the materials forming the second anode electrode film 22. It is designed to have a higher light transmittance than the second cathode electrode film 23. Specifically, the ratio of the light transmittance between the second anode electrode film 22 and the second cathode electrode film 23 is set to be, for example, 7: 3 to 6: 4.

As a result, the light (blue-green light) emitted from the second light emitting layer 21 of the second light emitting unit 20 toward both sides with a substantially equal amount of light passes through the second anode electrode film 22 and the second cathode electrode film 23. As a result, the ratio of the amount of transmitted light becomes 7: 3 to 6: 4.

Therefore, in the above-mentioned ratio of the amount of transmitted light in the range of 7: 3 to 6: 4, the light transmission rate of the first anode electrode film 12 of the first light emitting unit 10 and the second anode electrode film 22 of the second light emitting unit 20 is adjusted. The light transmission rate of the first cathode electrode film 13 of the first light emitting unit 10 and the second cathode electrode film 23 of the second light emitting unit 20 is set to 90%, and the light transmission layer 11 of the first light emitting unit 10 is set to 60%. Let the relative emission amount of the emitted red light be 100.

Then, as shown in FIG. 3, the relative light amount of the red light emitted from the first light emitting layer 11 to the side of the first anode electrode film 12 becomes 50, which is almost half of the relative light emitting light amount of the first light emitting layer 11. 1 The relative light amount transmitted through the anode electrode film 12 becomes 45, and the relative light amount of 45 is emitted to the outside.

On the other hand, the relative amount of red light emitted from the first light emitting layer 11 to the side of the first cathode electrode film 13 is also approximately 50, and the relative amount of light transmitted through the first cathode electrode film 13 is 30. The light transmitted through the first cathode electrode film 13 sequentially passes through the transparent solid layer 30, the second cathode electrode film 23 of the second light emitting unit 20, the second light emitting layer 21, and the second anode electrode film 22 to the outside. Is emitted to.

Therefore, assuming that the light transmittance of the transparent solid layer 30 and the second light emitting layer 21 is 100%, the light having a relative light amount of 30 emitted from the first light emitting layer 11 and transmitted through the first cathode electrode film 13 is the first. The relative light amount is 18 through the two cathode electrode film 23, and the relative light amount is 16.2 through the second anode electrode film 22, and the relative light amount of 16.2 is emitted to the outside.

Therefore, for example, assuming that white light is obtained by additive color mixing of red light having a relative light amount of 16.2 and blue-green light having a relative light amount equivalent to that of red light, it is assumed that white light is obtained from the second light emitting layer 21 of the second light emitting unit 20. When the relative light amount of the blue-green light emitted to the side of the second anode electrode film 22 is 18, the relative light amount of the blue-green light transmitted through the second anode electrode film 22 is 16.2, and the relative light amount is 16.2 red. White light can be obtained by additive color mixing with light.

Then, at this time, the blue-green light having a relative light emission amount of 36 is emitted in the second light emitting layer 21 of the second light emitting unit 20, and the blue-green light having a relative light amount of 18 is also emitted on the side of the second cathode electrode film 23. Has been issued.

The blue-green light having a relative luminous intensity of 18 emitted to the side of the second cathode electrode film 23 passes through the second cathode electrode film 23, and the relative light amount becomes 10.8. The light transmitted through the second cathode electrode film 23 sequentially passes through the transparent solid layer 30, the first cathode electrode film 13 of the first light emitting unit 10, the first light emitting layer 11, and the first anode electrode film 12 to the outside. Is emitted to.

Therefore, assuming that the light transmittance of the transparent solid layer 30 and the first light emitting layer 11 is 100%, the light emitted from the second light emitting layer 21 and transmitted through the second cathode electrode film 23 has a relative light amount of 10.8. , The relative light amount is 6.48 through the first cathode electrode film 13, and the relative light amount is 5.832 through the first anode electrode film 12, and the relative light amount of 5.832 is emitted to the outside. NS.

Therefore, red light having a relative light amount of 16.2 and blue-green light having a relative light amount of 16.2 are emitted from the second anode electrode film 22 side of the second light emitting unit 20 of the OLED panel 1 and are relative to each other by additive color mixing. An achromatic white light with a light intensity of 32.4 can be obtained.

Further, red light having a relative light amount of 45 and blue-green light having a relative light amount of 5.832 are emitted from the first anode electrode film 12 side of the first light emitting unit 10 of the OLED panel 1, and the relative light amount is reduced to blue-green. On the other hand, since the relative amount of red light is much larger, almost red light having a relative amount of 50.832 can be obtained by additive color mixing.

As described above, in the OLED panel 1 of the first embodiment, the first light emitting portion 10 in which the first anode electrode film 12 and the first cathode electrode film 13 are formed on both sides of the first light emitting layer 11 and the second light emitting portion 10. The second light emitting portion 20 in which the second anode electrode film 22 and the second cathode electrode film 23 are formed on both sides of the light emitting layer 21 is superposed with the cathode electrode films 13 and 23 facing each other. Both the first light emitting unit 10 and the second light emitting unit 20 have a structure in which the anode electrode films 12 and 22 have a higher light transmittance than the cathode electrode films 13 and 23. The amount of light emitted from the first light emitting layer 11 was set to be larger than the amount of light emitted from the second light emitting layer 21 at an appropriate ratio based on the ratio of the light transmittance of the electrode film.

As a result, the hue light (red light) emitted from the first light emitting layer 11 is emitted from the first light emitting unit 10 side of the OLED panel 1 almost as it is, and is emitted from the second light emitting unit 20 side of the OLED panel 1. Light (white light) due to additive color mixture of the hue light (red light) emitted from the first light emitting layer 11 and the hue light (blue-green light) emitted from the second light emitting layer 21 is emitted.

Therefore, the OLED panel 1 has a property of having light transmission and at the same time emitting light of different hues from both sides.

Therefore, as shown in FIG. 4, when the OLED panel 1 having the above configuration is attached to the rear window glass 40 of the vehicle and arranged to have the function of a tail lamp, the OLED panel 1 is lit (the first light emitting layer and the first light emitting layer). (The two light emitting layers emit light), as shown in FIG. 5, red light is emitted toward the rear of the vehicle, and achromatic white light is emitted toward the vehicle interior side. The surface of the OLED panel 1 having a large amount of emitted light (first light emitting portion 10 side) is arranged toward the outside of the vehicle, and the surface having a small amount of emitted light (side of the second light emitting portion) is arranged toward the inside of the vehicle.

Therefore, when the OLED panel 1 is lit, the red light of the tail display is not emitted to the vehicle interior side, and the red light is not emitted toward the front of the vehicle. As a result, even if the OLED panel 1 attached and arranged on the rear window glass has the function of a tail lamp, it does not violate the regulations.

Further, the light emitted from the OLED panel 1 to the vehicle interior side is achromatic white light, and the amount of light is smaller than that of the red light emitted toward the rear of the vehicle. Therefore, it does not hinder the driver's driving and does not impair normal driving.

Further, since the OLED panel 1 has light transmission, it does not obstruct the view behind the vehicle and does not hinder the visibility behind the vehicle.

The light transmittance of the first cathode electrode film 13 of the first light emitting unit 10 and the second cathode electrode film 23 of the second light emitting unit 20 is in the range of approximately 7: 3 to 6: 4 in the above-mentioned ratio of the amount of transmitted light. As shown in FIG. 6, among the red light having a relative light emission amount of 100 emitted by the first light emitting layer 11, of the red light having a relative light emission amount of 100, the first light emitting layer 11 to the first anode electrode film 12 The relative light amount of the red light emitted to the side is 50, which is almost half of the relative light emission amount of the first light emitting layer 11, and the relative light amount transmitted through the first anode electrode film 12 is 45, and the relative light amount of 45 is to the outside. It is emitted.

On the other hand, the relative amount of red light emitted from the first light emitting layer 11 to the side of the first cathode electrode film 13 is also approximately 50, and the relative amount of light transmitted through the first cathode electrode film 13 is 20. The light transmitted through the first cathode electrode film 13 sequentially passes through the transparent solid layer 30, the second cathode electrode film 23 of the second light emitting unit 20, the second light emitting layer 21, and the second anode electrode film 22 to the outside. Is emitted to.

Therefore, assuming that the light transmittance of the transparent solid layer 30 and the second light emitting layer 21 is 100%, the light having a relative light amount of 20 emitted from the first light emitting layer 11 and transmitted through the first cathode electrode film 13 is the first. The relative light amount is 8 through the two cathode electrode film 23, and the relative light amount is 7.2 through the second anode electrode film 22, and the relative light amount of 7.2 is emitted to the outside.

Therefore, for example, assuming that white light is obtained by additive color mixing of red light having a relative light amount of 7.2 and blue-green light having a relative light amount equivalent to that of red light, it is assumed that white light is obtained from the second light emitting layer 21 of the second light emitting unit 20. When the relative light amount of the blue-green light emitted to the side of the second anode electrode film 22 is 8, the relative light amount of the blue-green light transmitted through the second anode electrode film 22 is 7.2, and the relative light amount is 7.2 red. White light can be obtained by additive color mixing with light.

Then, at this time, the blue-green light having a relative light emission amount of 16 is emitted in the second light emitting layer 21 of the second light emitting unit 20, and the blue-green light having a relative light amount of 8 is also emitted on the side of the second cathode electrode film 23. Has been issued.

The blue-green light having a relative luminous intensity of 8 emitted to the side of the second cathode electrode film 23 passes through the second cathode electrode film 23, and the relative light amount is 3.2. The light transmitted through the second cathode electrode film 23 sequentially passes through the transparent solid layer 30, the first cathode electrode film 13 of the first light emitting unit 10, the first light emitting layer 11, and the first anode electrode film 12 to the outside. Is emitted to.

Therefore, assuming that the light transmittance of the transparent solid layer 30 and the first light emitting layer 11 is 100%, the light emitted from the second light emitting layer 21 and transmitted through the second cathode electrode film 23 has a relative light amount of 3.2. , The relative light amount is 1.28 through the first cathode electrode film 13, and the relative light amount is 1.152 through the first anode electrode film 12, and the relative light amount of 1.152 is emitted to the outside. NS.

Therefore, red light having a relative light amount of 7.2 and blue-green light having a relative light amount of 7.2 are emitted from the second anode electrode film 22 side of the second light emitting unit 20 of the OLED panel 1 and are relative to each other by additive color mixing. An achromatic white light with a light intensity of 14.4 can be obtained.

Further, red light having a relative light amount of 45 and blue-green light having a relative light amount of 1.152 are emitted from the first anode electrode film 12 side of the first light emitting unit 10 of the OLED panel 1, and the relative light amount is reduced to blue-green. On the other hand, since the relative amount of red light occupies most of the light, red light having a relative amount of light of 46.152 can be obtained by additive color mixing.

As a result, by lowering the light transmittance of the first cathode electrode film 13 of the first light emitting unit 10 and the second cathode electrode film 23 of the second light emitting unit 20, the overall light transmission rate of the OLED panel 1 is lowered. However, the purity (stimulation purity) of the red light emitted from the first anode electrode film 12 side becomes high, and the relative amount of achromatic white light emitted from the second anode electrode film 22 side of the OLED panel 1 increases. descend.

Further, since the amount of light emitted from the second light emitting layer 2 can be reduced, the lighting life of the organic light emitting layer can be extended, and a highly reliable OLED panel can be realized.

Therefore, this makes it possible to display the tail with clear red light, suppress unnecessary light (white light) toward the vehicle interior, and secure a normal driving environment.

In the OLED panel 1 having the above configuration, the light transmission rates of the first anode electrode film 12 and the second anode electrode film 22 are the same, and the light transmission rates of the first cathode electrode film 13 and the second cathode electrode film 23 are the same. Although they are the same, the setting of the light transmittance is not limited to this, and it is also possible to set the light transmission rate individually for each electrode film.

Further, the first light emitting layer 11 is an organic light emitting layer that emits red light, and the second light emitting layer 21 is an organic light emitting layer that emits bluish green light, but the present invention is not limited to this, and the first light emitting layer 11 is not limited to this. The second light emitting layer 21 can be combined with various light emitting colors depending on the use, purpose, and the like of the OLED panel 1.

By the way, in the OLED panel 1 having the above configuration, the first light emitting layer 11 is composed of an organic layer that emits orange light, and the second light emitting layer 21 is a green-blue light that is a complementary color of the orange light emitted from the first light emitting layer 11. It is composed of an organic layer that emits light. Then, the OLED panel 2 that emits orange light from one side and emits white light from the other side by such a configuration is attached to the side window glass 45 of the vehicle as shown in FIG. 7 and arranged to turn. It can also have the function of a signal lamp. In this case, when the OLED panel 2 is lit (the first light emitting layer and the second light emitting layer emit light), as shown in FIG. 8, orange light is emitted toward the vehicle side and nothing is emitted on the vehicle interior side. Colored white light is emitted.

Therefore, when the OLED panel 2 is lit, the orange light of the turn signal display is not emitted to the vehicle interior side, and is not transmitted to the side through the side window glass on the opposite side. Therefore, when the vehicle is viewed from the side, it can be reliably determined whether the left or right turn signal lamp is lit, and the operation information of the vehicle can be reliably transmitted (displayed) to the outside of the vehicle.

Further, the light emitted from the OLED panel 2 to the vehicle interior side is achromatic white light, and the amount of light is smaller than that of the orange light emitted toward the vehicle side. Therefore, it does not hinder the driver's driving and does not impair normal driving.

Next, a second embodiment of the OLED panel of the present invention will be described with reference to the schematic cross-sectional view of FIG.

The OLED panel 3 of the second embodiment has a second light emission of the first cathode electrode film 13 of the first light emitting layer 11 of the first light emitting unit 10 and the second light emitting unit 20 with respect to the OLED panel 1 of the first embodiment. The gas layer 35 is provided at an intermediate position of the transparent solid layer 30 located between the second cathode electrode films 23 of the layer 21.

The gas layer 35 is provided at a position surrounded by a transparent solid layer 30 on both sides, and an inert gas such as air, nitrogen gas, or argon gas is used as the gas constituting the gas layer 35. In any case, the layer has a lower refraction than the transparent solid layer 30.

In the gas layer 35, the light emitted from the first light emitting layer 11 and transmitted through the first cathode electrode film 13 toward the second light emitting layer 21 and the light emitted from the second light emitting layer 21 and transmitted through the first cathode electrode film 13 are emitted from the second cathode electrode film. The light transmitted through 23 and heading toward the first light emitting layer 11 is partially reflected back at the interface of the gas layer 35 and is attenuated.
In addition to the difference in the transmittance of the transparent electrode in the first embodiment, the difference in the relative light amount of the light emission amount on both sides is large in each of the first light emitting unit 10 and the second light emitting unit 20 due to the addition of reflection at the interface of the gas layer 35. can do. Instead of the gas layer 35, a substance layer having a lower refraction than the transparent solid layer 30 may be used.

Therefore, since the light passing through is attenuated by the colorless and transparent gas layer 35, it is possible to suppress the reduction of the light transmittance of the first cathode electrode film 13 and the second cathode electrode film 23, respectively, and the OLED panel 3 It is possible to avoid a decrease in the overall light transmittance. Also in the second embodiment, the amount of light emitted from the first light emitting unit 10 and the second light emitting unit 20 is small in the overlapping direction and large in the non-overlapping direction. .. Further, the emission colors of the first light emitting unit and the second light emitting unit have a complementary color relationship, and the light emitting amount of the second light emitting unit 20 is smaller than the light emitting amount of the first light emitting unit 10, so that the second light emitting unit emits light. The irradiation from the portion side is white, and the irradiation from the first light emitting portion side is set to a color close to the original emission color from the first light emitting portion.

Next, a third embodiment of the OLED panel of the present invention will be described with reference to the schematic cross-sectional view of FIG.

The OLED panel 4 of the third embodiment is a second light emitting unit 20 having a second light emitting layer 20, a second anode electrode film 22 and a second cathode electrode film 23 with respect to the OLED panel 1 of the first embodiment. Instead, it has a configuration using a plate-shaped light guide body 50.

The light guide body 50 has a light emitting unit 51 having both sides as light emitting surfaces, and is separately provided with a light source (light source for the light guide body) 52 that emits light to be introduced into the light guide body 50. Therefore, only the light emitted from the light guide body 50 side is obtained by appropriately changing the light emission color of the light source 52 for the light guide body while the color of the light emitted from the first light emitting unit 10 side of the OLED panel 4 is fixed. The hue can be easily changed. The light guide body 50 is formed so that the light source 52 emits more light from the side that does not overlap with the surface that overlaps with the first light emitting unit 10. This is done, for example, by forming a mirror surface on the surface overlapping with the first light emitting unit 10 and forming a roughness for light extraction on the surface on the non-overlapping side, or by forming an antireflection film. realizable. Also in the third embodiment, the amount of light emitted from the first light emitting unit 10 and the light emitting body 50 is small in the overlapping direction, and the amount of light emitted from the non-overlapping direction is large. Further, the light emitting color of the first light emitting unit and the light emitting unit is selected to have a complementary color relationship, and the light emitting amount of the light emitting unit 50 is smaller than the light emitting amount of the first light emitting unit 10. The irradiation from the first light emitting unit side is white, and the irradiation from the first light emitting unit side is set to a color close to the original emission color from the first light emitting unit.

As a result, the visual effect of the OLED panel 4 can add value such as design and decoration to the OLED panel 4.

Since the OLED panel of the present invention can obtain light of different colors on both sides of the panel, it can be used for, for example, an entrance / exit display, an intrusion possibility display, a guide light, or the like.

1 ... OLED (organic LED) panel 2 ... OLED (organic LED) panel 3 ... OLED (organic LED) panel 4 ... OLED (organic LED) panel 10 ... 1st light emitting unit 11 ... 1st organic light emitting layer (1st light emitting layer) )
12 ... Transparent anode electrode film (first anode electrode film)
13 ... Transparent cathode electrode film (first cathode electrode film)
20 ... Second light emitting unit 21 ... Second organic light emitting layer (second light emitting layer)
22 ... Transparent anode electrode film (second anode electrode film)
23 ... Transparent cathode electrode film (second cathode electrode film)
30 ... Transparent solid layer 35 ... Gas layer 40 ... Rear window glass 45 ... Side window glass 50 ... Light guide 51 ... Light emitting unit 52 ... Light source (light source for light guide)

Claims (8)

A first light emitting portion in which a transparent anode electrode film and a transparent cathode electrode film are formed on both sides of a first light emitting layer made of an organic light emitting layer that emits light from both sides.
A second light emitting portion in which a transparent anode electrode film and a transparent cathode electrode film are formed on both sides of a second light emitting layer made of an organic light emitting layer that emits light from both sides.
Equipped with a,
The first light emitting unit and the second light emitting unit overlap each other with their transparent cathode electrode films facing each other.
The first light emitting unit and the second light emitting unit emit light having different hues from each other.
In both the first light emitting unit and the second light emitting unit, the transparent anode electrode film has a higher light transmittance than the transparent cathode electrode film.
An OLED panel characterized in that the first light emitting unit and the second light emitting unit are integrated by being overlapped with each other. The OLED panel according to claim 1 , wherein a transparent solid layer is arranged between the transparent cathode electrode films. The OLED panel according to claim 1 or 2 , wherein the first light emitting layer and the second light emitting layer have different amounts of light emitted from each other. Wherein the first light-emitting layer and the second light-emitting layer, OLED panel according to any one of claims 1 to 3, characterized in that emit light of colors in the complementary relationship. The OLED panel according to claim 2 , wherein a gas layer is provided at an intermediate position of the transparent solid layer. The OLED panel according to claim 5 , wherein the gas layer is an inert gas or air. According to any one of claims 1 to 6, wherein the light emission is stronger than the light emitting surface side of light emission of the first said light-emitting layer and the second emitting layer is not both overlapping emission surface side is overlapped OLED panel. It is a vehicle lamp that can be attached to the window of a vehicle.
A first light emitting portion in which a transparent anode electrode film and a transparent cathode electrode film are formed on both sides of a first light emitting layer made of an organic light emitting layer that emits light from both sides.
It is equipped with a translucent second light emitting part that emits light from both sides.
The first light emitting unit and the second light emitting unit emit light that are complementary colors to each other.
The first light emitting unit and the second light emitting unit are integrated by overlapping with each other.
The light emitted from the first light emitting unit is relatively weak toward the second light emitting unit side and relatively strong toward the facing surface side.
In the second light emitting unit, the combined color of the light emitted from the first light emitting unit and the light emitted from the second light emitting unit emitted from the second light emitting unit side is white, and the second light emitting unit is irradiated from the first light emitting unit side. The combined color of the light emitted from the first light emitting unit and the light emitted from the second light emitting unit is different from that of white, so that the light emitted is emitted with a smaller amount of light emitted than the first light emitting unit.
A vehicle lamp body characterized in that the surface on the side of the second light emitting portion is composed of an OLED panel attached to the window portion.

Images