JP2000305480A - Head up display device, display device in mirror screen and high mount stop display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a display device which may be utilized for information display by being mounted on a vehicle and the display device which is inexpensive, provides good visibility and permits full color display as well. SOLUTION: The head up display device D1 has a light source (projection source) 81 for projecting light and a screen 81 for displaying information by receiving the light from the light source 81. The light source 81 has an organic electroluminescence element 811 and is capable of projecting light toward the screen 81 by utilizing the emitted light from the organic electroluminescence element. The organic electroluminescence element 811 consists of a structure which may be simple matrix driven. The organic electroluminescence element 811 has an anode, cathode and organic light emitting film held between these two electrodes. The anode and cathode consists of plural belt-like electrodes lining up respectively at fine intervals in parallel.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a display device (display device) mounted on a vehicle such as an automobile and used for displaying information.

[0002]

2. Description of the Related Art Vehicles such as automobiles, motorcycles, airplanes, helicopters, and ships are provided with various devices for informing various information to drivers (pilots) and the like.
For example, an automobile is provided with a device for notifying a traveling speed, a rotation speed, a remaining fuel amount, a time, a traveling distance, and the like. Analog meters for displaying information by moving a needle are often used for such information display devices, but recently, digital display devices are also used. As such digital display devices, those using LEDs, VFDs (fluorescent display tubes), and liquid crystals have been proposed. In automobiles, many of these devices for displaying information are
It is arranged below the front window, and when the driver looks at the equipment below the front window and reads information during driving, the viewpoint must be relatively largely moved. A large viewpoint movement is not preferable for safe driving, and a display device called a head-up display device has been proposed to suppress the viewpoint movement.
As a head-up display device, a device that projects information on a translucent screen to display information has been proposed. By disposing the translucent screen below the front window, the driver can read information with a relatively small movement of the viewpoint. A head-up display device that projects light using a VFD has been proposed.

[0003] In addition, a car may be provided with a navigation device for notifying navigation information. A liquid crystal display (LCD) is often used as a display device for a navigation device. For cars,
Further, a device for notifying other car drivers or the like of information is also provided. For example, a direction indicating device (a blinker device) for notifying a turning direction and a stop display device for notifying that a brake is applied are provided. These direction indicating devices and stop display devices display information by emitting / non-emitting light.
Light-emitting lamps are often used as light-emitting sources. Also, in order to effectively prevent rear-end collisions in cars,
In some cases, a high-mount stop display device called a high-mount stop lamp, which is disposed relatively above the vehicle body, is provided. This high-mount stop display device displays whether or not braking is being performed by emitting or not emitting light, and is disposed relatively above the vehicle body. Can also transmit information and suppress accidents such as multiple collisions. LEDs are often used in high mount stop display devices.

[0004]

As described above, vehicles such as automobiles are provided with a display device for displaying various information. However, when a liquid crystal display device is used as the display device, it becomes expensive and expensive. , The viewing angle is relatively small and visibility is poor. In addition, display devices using LEDs are:
Difficult to display full color. A display device using a VDF has problems such as a high driving voltage, high power consumption, and difficulty in full-color display.

Accordingly, the present invention is a display device which can be mounted on a vehicle and used for displaying information.
It is an object to provide a display device with good visibility and capable of full-color display.

[0006]

The present invention provides the following three display devices (display devices). The first display device is a head-up display device for projecting light on a predetermined screen arranged in front of a driver's seat of a vehicle to display information, and uses an organic electroluminescence element to project light. A head-up display device (head-up display device).

The second display device is a display device in a mirror screen for displaying information superimposed on an image of an object to be observed observed by a mirror, comprising: a mirror reflector having a reflection surface;
An information display organic electroluminescence element disposed on the reflection surface. The third display device is a high-mount stop display device arranged at the rear of the vehicle for indicating that the brake is being applied, wherein information is displayed by an organic electroluminescence element. Device.

[0008] The head-up display device, the in-mirror display device and the high-mount stop display device according to the present invention are all automobiles, aircrafts (airplanes, helicopters, etc.), motorcycles (motorcycles, motorcycles), trains, bicycles, etc. It can be mounted on vehicles such as ships and used for information display. The in-mirror screen display device of the present invention can be typically mounted on an automobile and used for information display. The in-mirror screen display device of the present invention can be used for displaying information by arranging it in a building other than an automobile. The high mount stop display device of the present invention,
Typically, it can be mounted on a car and used for information display.

The display device (head-up display device, display device in a mirror screen, high-mount stop display device) according to the present invention has an organic electroluminescence element, and emits light from the organic electroluminescence element to display information. Use. The organic electroluminescence element used in the display device according to the present invention is an element that emits light in response to an electric signal and is configured using an organic compound as a light emitting substance.

The organic electroluminescence element has two electrodes, an anode and a cathode, and an organic light emitting film sandwiched between these electrodes. In light emission in the organic electroluminescence element, electrons are injected from one of the electrodes,
When holes are injected from the other electrode, electrons and holes are combined in the organic light emitting film, and the light emitter is excited to a higher energy level, and the excited light emitter returns to its original ground state. When returning, the excess energy is emitted as light.

As the organic light emitting film, the following (a1) to (a)
The example shown in 3) can be exemplified. (A1) a layer in which a hole transfer-related layer and an organic light emitting layer are laminated from the anode side to the cathode side, and (a2) from the anode side to the cathode side.
(A3) A layer in which an organic light emitting layer and an electron transfer-related layer are laminated from the anode side to a cathode side.

By providing the hole transfer-related layer and / or the electron transfer-related layer, the luminous efficiency can be increased. The hole transfer related layer and the electron transfer related layer may be provided as needed according to the characteristics of the electrodes and the characteristics of the organic light emitting layer. The hole movement-related layers may be, for example, those shown in the following (b1) to (b4). The hole transfer related layer is, for example, (b
1) a hole injection layer, (b2) a hole transport layer, (b3) a hole injection layer and a hole transport layer, or (b4) a hole injection layer. An appropriate layer may be selected as the hole transfer-related layer according to the characteristics of the electrode and the characteristics of the organic light emitting layer.

For example, the following layer (c1)
To (c4). The electron transfer-related layer is, for example, (c1) an electron injection layer, (c2) an electron transport layer, (c3) an electron injection layer and an electron transport layer, or (c4).
An electron injection transport layer may be used. An appropriate electron transfer layer may be selected according to the characteristics of the electrodes and the characteristics of the organic light emitting layer.

With respect to the organic light emitting layer, for example, all or a part of the hole transport layer or the hole injection / transport layer may be doped with a fluorescent substance, so that all or a part of these layers may be used as a light emitting layer. Further, as for the organic light emitting layer, all or a part of the electron transport layer or the electron injection / transport layer may be doped with a fluorescent substance, so that all or a part of these layers may be used as a light emitting layer.

An organic electroluminescent element emits light in two or more different colors or emits the same part in a different color by stacking two or more structures having at least an anode, an organic light-emitting film, and a cathode. be able to. Further, between the anode and the cathode of the organic electroluminescence element, a plurality of types of organic light-emitting layers are arranged in combination with an appropriate hole transfer-related layer or an electron transfer-related layer, and the magnitude of the voltage applied between both electrodes is reduced. By changing, the emission color can be changed. When two or more organic light emitting layers are provided in an organic electroluminescent element, each organic light emitting layer is doped with a different fluorescent dye and the direction of the applied electric field is changed, or each organic light emitting layer is formed of a different light emitting material. By changing the direction of the applied electric field, the emission color of each organic light emitting layer can be changed. Also, the emission color can be changed by doping two or more kinds of fluorescent dyes into the organic light emitting layer and adjusting the applied voltage.

As the organic electroluminescence element, a light-transmitting element may be employed as a whole. The organic electroluminescent element is in a state in which even if a part of the element is opaque, the opaque part is not so obstructive as to the whole element, and thus can be said to have substantially translucency. May be. The organic electroluminescence element may have a predetermined pattern shape according to the content of information display using the element. In this case, the entire organic electroluminescence element may have a predetermined pattern shape, or only a part thereof (for example, only the cathode) may have a predetermined pattern shape. In addition, the anode and the cathode may have a matrix structure so that simple matrix driving can be performed so that any character or graphic can be displayed.

Since the display device of the present invention displays information using an organic electroluminescence element, it has good visibility, is inexpensive, and can perform color display. Hereinafter, the head-up display device, the in-mirror display device, and the high-mount stop display device according to the present invention will be described in further detail in order. (D1) Head-Up Display Device The head-up display device of the present invention is a display device for projecting light onto a predetermined screen arranged in front of a driver's seat of a vehicle to display information. In the head-up display device of the present invention, information is displayed by projecting light using an organic electroluminescence element. That is, the head-up display device of the present invention has an organic electroluminescent element as a projection source for projecting light. Since the head-up display device of the present invention uses an organic electroluminescence element as a projection source, it has high visibility, can display information at low cost, and can also perform color display.

The head-up display device of the present invention can be used, for example, mounted on an automobile, an aircraft, a train, a motorcycle, and the like. Examples of the screen for projecting light from the organic electroluminescence element include the following. When mounting the head-up display device of the present invention on a vehicle such as an automobile, an aircraft, or a train, which has a front window made of a translucent glass or the like in front of a driver's seat, the screen is, for example, part or all of the front window. Or a translucent screen disposed between the front window and the driver's seat. When the head-up display device of the present invention is mounted on a motorcycle, the screen may be, for example, a translucent screen disposed in front of a driver's seat. When the motorcycle is equipped with a translucent wind shade (wind shield) in front of the driver's seat and translucent aero parts for reducing air resistance, a part or all of the wind shade or a part of the aero parts is provided. Some or all may be used as a screen.

Front window, wind shade,
In the case where aero parts or the like are used as screens, a process may be performed such that the portions used as the screens are subjected to reflection processing to make the portions translucent. When using front windows, wind shades, aero parts, etc. as screens and displaying relatively complicated information such as maps and text, the parts used as those screens must be made translucent. Is preferably applied. In a case where the front window, the windshade, the aero parts, and the like are used as a screen, when a relatively simple display such as a digital display of a speedometer is performed, they may be used as the screen as they are. When a wind shade is used as a screen, it is preferable to process the wind shade so as to easily reflect light from a projection source depending on the shape of the wind shade. (D2) In-mirror screen display device The in-mirror screen display device of the present invention is a display device for displaying information in a manner superimposed on an image of an object to be observed observed by a mirror.

The display device in a mirror screen according to the present invention includes a reflector for a mirror and an organic electroluminescence element for displaying information. The organic electroluminescence element is disposed so as to overlap the reflection surface of the mirror reflector. The organic electroluminescence element only needs to be arranged so as to be seen overlapping with the mirror reflector when viewed from the observer side. The organic electroluminescence element may be arranged directly on the reflection surface of the mirror reflector. The organic electroluminescence element and the mirror reflector may be formed integrally. A space may be provided between the organic electroluminescent element and the mirror reflector. A translucent member may be arranged between the mirror reflector and the organic electroluminescence element. The organic electroluminescent element may be arranged so that at least a part thereof overlaps the reflection surface of the mirror reflector when viewed from an observer.

The reflecting surface of the mirror reflector may be flat or curved (for example, convex). The organic electroluminescence element may have a surface shape corresponding to the reflection surface shape of the mirror reflector. A conventionally known mirror reflector can be employed. According to the in-mirror display device of the present invention, when the organic electroluminescence element does not emit light, the observer can mainly see the reflection image from the mirror reflector. That is, when the organic electroluminescence element does not emit light, the mirror display device of the present invention has the same function as a normal mirror. When the organic electroluminescent element is not emitting light, the organic electroluminescent element is entirely transparent so that the organic electroluminescent element does not disturb the observation of the reflection image (subject image) from the mirror reflector. It may have optical properties. Further, one of the anode and the cathode of the organic electroluminescence element may be used as a light-reflective reflective electrode, and this reflective electrode may be used for observing the image of the object to be observed. The other electrode may be a transparent electrode. The reflection electrode of the two electrodes (anode and cathode) of the organic electroluminescence element may be arranged on the side far from the observer side, in other words, on the side close to the mirror reflector. It is preferable that the reflection electrode has a reflection performance equivalent to that of the mirror reflector.

When the organic electroluminescence element emits light, a display corresponding to the light emission pattern can be performed on the object image observed by the mirror. Thereby, information can be displayed so as to be superimposed on the object image observed by the mirror. The mirror screen display device of the present invention can be considered as a display device having a mirror function, in other words, a mirror having a display device function.

The in-mirror display device of the present invention can be mounted on vehicles such as automobiles and motorcycles and used for displaying information. For example, when the in-mirror screen display device is mounted on an automobile, for example, information can be displayed on the screen of a rearview mirror, a side mirror, or a fender mirror. When the display device in the mirror screen of the present invention is mounted on a vehicle and used for information display, based on detection information of a sensor provided on the vehicle, the detection information, the instruction information to the driver, etc. Information may be displayed. For example, when using a mirror screen display device mounted on a car,
For example, based on distance information detected by a distance sensor embedded in a rear bumper of a vehicle, the distance information is displayed, and when it is detected that the vehicle has come too close to something, the driver is instructed to stop. May be displayed. The mirror display device of the present invention, besides vehicles,
For example, it can be used by arranging it in a building. (D3) High-mount stop display device The high-mount stop display device of the present invention is a device that is arranged at the rear of the vehicle and displays that braking is being applied, that is, braking is being performed. The high mount stop display device of the present invention can be typically used by arranging it at the rear of an automobile. The high-mount stop display device of the present invention can be used, for example, by arranging it on a rear window portion made of glass or the like of an automobile.

The high mount stop display device of the present invention includes an organic electroluminescence element.
An indication as to whether or not a brake is applied is made using the organic electroluminescence element. Typically, the organic electroluminescence element emits light to indicate that a brake is applied, and does not emit light to indicate that no brake is applied.

The organic electroluminescent element may have translucency as a whole. In this case, when the high-mount stop display device is arranged in the rear window portion of the vehicle, and when the organic electroluminescence element is not emitting light, the organic electroluminescence element may hinder the driver's rear view confirmation. No. As the organic electroluminescent element, one in which one of the anode and the cathode is a light-reflective reflective electrode may be employed. The other electrode may be a transparent electrode. When the high-mount stop display device is disposed on the rear window of the vehicle, the reflective electrode of the two electrodes, the anode and the cathode, may be disposed on the indoor side of the vehicle. According to this configuration, when the high mount stop display device is disposed in the rear window portion of the vehicle, and when the organic electroluminescence element emits light, light from the organic electroluminescence element enters the vehicle interior. In addition to being able to suppress, it is possible to more reliably notify the following vehicle that braking is in progress. When a high-mount stop display device including an organic electroluminescent element in which one electrode is a reflective electrode is arranged on a rear window made of a half mirror glass of an automobile, when the organic electroluminescent element does not emit light, the appearance is inconspicuous. Things.

When the high-mount stop display device of the present invention is arranged on the rear window of an automobile, the finished high-mount stop display device may be attached to the rear window, and the rear window and the high-mount stop display device (particularly, The organic electroluminescence device)
May be integrally formed. For example, when the organic electroluminescence element has an anode, an organic light-emitting film, and a cathode formed on a light-transmitting substrate, the light-transmitting substrate itself is part of a rear window made of a half mirror glass of an automobile. Alternatively, the light-transmitting substrate itself may be part or all of a rear window made of a light-transmitting glass of an automobile. When the translucent substrate is a rear window made of a half mirror glass, an organic electroluminescent element is integrally provided on the rear window. When the translucent substrate is a rear window made of a half mirror glass, one of the anode and the cathode of the organic electroluminescence element may be a reflection electrode as described above. When the translucent substrate is a rear window made of translucent glass, the rear window itself is provided with an organic electroluminescent element.

[0027]

Embodiments of the present invention will be described below with reference to the drawings. (1) First, an organic electroluminescence element used in the display device of the present invention will be described. 1 to 9 show schematic configuration diagrams of examples of the organic electroluminescence element.

An organic electroluminescent device A shown in FIG. 1 has an anode 1 and a hole injection / transport layer 2 on a transparent substrate G.
3, an organic light emitting layer 3 and a cathode 5 are sequentially laminated. Both the anode 1 and cathode 5 electrodes are connected to lead wires L1, L
2 is connected to the power supply PS. The organic light emitting layer 3 emits light when a predetermined voltage is applied between both electrodes from the power supply PS.

The organic electroluminescent element B shown in FIG. 2 has an anode 1 and a hole injection / transport layer 2 on a transparent substrate G.
3, the organic light emitting layer 3, the electron transport layer 41, the electron injection layer 42, and the cathode 5 are sequentially laminated. Also in this organic electroluminescence element B, the organic light emitting layer 3 emits light by applying a voltage from the power supply PS between both electrodes.

The organic electroluminescent device C shown in FIG. 3 comprises an anode 1, a hole injection layer 21, a hole transport layer 22, an organic light emitting layer 3, an electron transport layer 41, an electron injection layer 42 and a cathode 1 on a transparent substrate G. 5 are sequentially laminated. Also in the organic electroluminescence element C, the organic light emitting layer 3 emits light by applying a voltage from the power supply PS between both electrodes.

An organic electroluminescent device D shown in FIG. 4 comprises an anode 1, a hole injection layer 21, a hole transport layer 22, an organic light emitting layer 3, an electron transport layer 41, an electron injection layer 42, and a cathode 1 on a transparent substrate G. 5 and the sealing film 71 are sequentially laminated. The sealing film 71 can suppress deterioration of both electrodes and each layer due to moisture and oxygen. Also in this organic electroluminescence element D, the organic light emitting layer 3 emits light by applying a voltage from the power supply PS between both electrodes.

An organic electroluminescent device E shown in FIG. 5 has an anode 1 and a hole injection / transport layer 2 on a transparent substrate G.
3, an organic light emitting layer 3, an electron injection layer 42 and a cathode 5 are sequentially laminated. Also in this organic electroluminescent element E, the organic light emitting layer 3 emits light by applying a voltage from the power supply PS between both electrodes. The organic electroluminescent element F shown in FIG. 6 is one in which an anode 1, a hole injection layer 21, a hole transport layer 22, an organic light emitting layer 3, an electron injection layer 42 and a cathode 5 are sequentially formed on a transparent substrate G. is there. Also in this organic electroluminescence element F, the organic light emitting layer 3 emits light by applying a voltage from the power supply PS between both electrodes.

The organic electroluminescent element H shown in FIG. 7 has an anode 1 and a first organic light emitting layer 3 on a transparent substrate G.
a, a blocking layer 6 made of a hole transporting compound or an electron transporting compound, a second organic light emitting layer 3b, and a cathode 5 are sequentially laminated. Also in this organic electroluminescence element H, the organic light emitting layer emits light by applying a voltage between the two electrodes from the power supply PS. First light emitting layer 3
a and the second light emitting layer 3b use different types of light emitting materials, and by changing the direction of the electric field applied between the anode 1 and the cathode 5 forward and reverse, it is possible to change the emission color. it can.

The organic electroluminescent device I shown in FIG. 8 is obtained by stacking a stacked structure composed of an anode 1, an organic light emitting layer 3 and a cathode 5 on a transparent substrate G in two stages. In this organic electroluminescent element I, the organic light emitting layer 3 in the upper structure emits light by applying a voltage from the power supply PS1 between both electrodes of the upper structure. Similarly, for the organic light emitting layer 3 in the lower structure, the power supply PS
2 can emit light.

An organic electroluminescent device J shown in FIG. 9 has an anode 1 and a hole injection / transport layer 2 on a transparent substrate G.
3, an organic light emitting layer 3, an electron injection / transport layer 43, and a cathode 5 are sequentially laminated. In the organic electroluminescence element J, a part of the cathode 5 is formed on the substrate G. These two electrodes and each layer, except for a part of the anode 1 and a part of the cathode 5, have the sealing glass 73 and the sealing resin 7.
2 and sealed. By performing such sealing, deterioration of both electrodes and each layer due to oxygen and moisture can be suppressed. Lead wires L1 and L2 are drawn from unsealed portions of the anode 1 and the cathode 5. Also in this organic electroluminescence element J, the organic light emitting layer 3 emits light by applying a voltage between both electrodes from the power supply PS. Light from the organic light emitting layer 3 can be viewed through the substrate G or (and) the sealing glass 73 depending on whether the anode 1 and the cathode 3 are transparent or opaque, for example. (2) Next, a method for forming an organic electroluminescence element will be described. In addition, examples of the materials of the substrate, the electrodes, and the respective layers constituting the organic electroluminescence element will be described.

In any of the organic electroluminescent devices shown in FIGS. 1 to 9, the electrodes,
It can be formed by sequentially forming an organic light emitting layer and the like. In the illustrated example, the anode is formed on a transparent substrate in all cases. Conversely, a cathode is first formed on a transparent substrate, and other layers including an organic light emitting layer are sequentially formed thereon. The organic electroluminescence element may be manufactured by forming the anode and finally forming the anode. (2-1) Transparent Substrate The transparent substrate is not particularly limited as long as it has an appropriate strength, is not adversely affected by heat at the time of manufacturing an organic electroluminescent element, at the time of film deposition and the like, and is transparent. Examples of such a material include a glass substrate and a transparent resin such as polyethylene, polypropylene, polyethersulfone, and polyetheretherketone. (2-2) Anode The anode is formed of a conductive material. In the organic electroluminescence element, at least one of the anode and the cathode needs to be translucent in order to view light emission from the organic light emitting film including the organic light emitting layer. Any of the electrodes may be light-transmitting, but the transparency is particularly good when the anode is light-transmitting. Furthermore, it is preferred that the anode be transparent. The anode may be, for example, a light-transmitting conductive film or a transparent conductive film.

As a material for such an anode, it is preferable to use a conductive substance having a work function greater than 4.5 eV. Examples of such materials include metals such as carbon, aluminum, vanadium, iron, cobalt, nickel, copper, zinc, tungsten, silver, tin, gold, and alloys thereof, as well as tin oxide, indium oxide, antimony oxide, and zinc oxide. , Metal oxides such as zirconium oxide, and solid solutions thereof (for example, indium oxide
Conductive metal compounds such as tin solid solution) and mixtures.

The anode may be formed, for example, on a transparent substrate by using a conductive material as described above, using a method such as vapor deposition or sputtering, a sol-gel method, or dispersing such a conductive material in a resin or the like and applying the same. It can be formed using a technique. The anode may be formed so that desired translucency and conductivity are ensured. After an anode material film is uniformly formed on a transparent substrate by the above-described film formation technique, an anode patterned into a predetermined shape may be formed by a technique such as photolithography and etching.

It is preferable that the anode is sufficiently washed so that hole injection is likely to occur. The anode may be cleaned by, for example, a wet cleaning method or a UV / ozone cleaning method. When cleaning the anode, irradiation with an excimer lamp or plasma treatment may be performed. The anode may be washed by combining these. The thickness of the anode is
Although it depends on whether the anode is made of a conductive metal compound or not, in order to obtain a light-transmitting property, it is sufficient that the anode is generally in the range of 10 ° to 2000 °.

As a transparent substrate and an anode, a transparent electrode formed on a glass substrate, for example, an IT
A transparent electrode made of O (Indium Tin Oxide) or a transparent electrode formed on a glass substrate by Corning, which is commonly called NESA glass, may be used. (2-3) Hole transport-related layer As the hole transport material that can be used for forming the hole transport layer or the hole injection transport layer, known materials can be used.

As the hole transporting material, for example, N, N'-
Diphenyl-N, N'-bis (3-methylphenyl)-
1,1'-diphenyl-4,4'-diamine, N, N '
-Diphenyl-N, N'-bis (4-methylphenyl)
-1,1'-diphenyl-4,4'-diamine, N,
N'-diphenyl-N, N'-bis (1-naphthyl)-
1,1'-diphenyl-4,4'-diamine, N, N '
-Diphenyl-N, N'-bis (2-naphthyl) -1,
1'-diphenyl-4,4'-diamine, N, N'-tetra (4-methylphenyl) -1,1'-bis (3-methylphenyl) -4,4'-diamine, N, N'- Diphenyl-N, N'-bis (3-methylphenyl) -1,
1'-bis (3-methylphenyl) -4,4'-diamine, N, N'-bis (N-carbazolyl) -1,1'-
Diphenyl-4,4′-diamine, 4,4 ′, 4 ″ -tris (N-carbazolyl) triphenylamine, N,
N ', N "-triphenyl-N, N', N" -tris (3-methylphenyl) -1,3,5-tri (4-aminophenyl) benzene, 4,4 ', 4 "-tris [ N,
N ', N "-triphenyl-N, N', N" -tris (3-methylphenyl)] triphenylamine. These may be used as a mixture of two or more.

The hole transporting layer or the hole injecting and transporting layer may be formed by vapor deposition of the above hole transporting material, or a solution in which the hole transporting material is dissolved or an appropriate hole transporting material. It may be formed by a coating method such as a dip coating method or a spin coating method using a liquid dissolved together with a resin. When formed by a vapor deposition method, the thickness is about 30 nm to 100 nm,
When formed by a coating method, the thickness is 50 nm to 200 nm.
It may be set to about nm.

As the thickness of the hole transporting layer or the hole injecting / transporting layer is larger, it is necessary to increase the applied voltage for emitting light, so that the luminous efficiency deteriorates and the organic electroluminescent display element is liable to be deteriorated. When the film thickness is small, the luminous efficiency is improved, but the breakdown is easy and the life of the organic electroluminescent element is shortened.
Therefore, the film may be formed in the above-mentioned thickness range in consideration of the luminous efficiency and the life of the element.

The hole injection layer may be formed by vapor deposition of a hole injection material, or may be formed by dip coating using a solution in which the hole injection material is dissolved or a solution in which the hole injection material is dissolved together with an appropriate resin. It may be formed by a coating method such as a spin coating method or a spin coating method. When the hole injection layer is formed by an evaporation method, its thickness is about 1 nm to 20 nm, and when it is formed by a coating method, its thickness may be about 1 nm to 50 nm.

By providing the hole injection layer, the luminous efficiency is improved, the leakage current at a minute portion at the anode interface is effectively prevented, the generation of a dark spot can be prevented, and the life of the device can be extended. Can be. Examples of the hole injecting material for forming the hole injecting layer include porpholine ring compounds such as copper phthalocyanine, indanthrene pigments, carbon films, conductive polymer films such as polyaniline and polythiophene, and 4,4 ′, 4 ″. -Tris (N-carbazoly) triaminotriphenylamine, N, N ', N "-triphenyl-N, N', N" -tris (3-methylphenyl)
-1,3,5-tri (4-aminophenyl) benzene,
4,4 ', 4 "-tris [N, N', N" -triphenyl-N, N ', N "-tris (3-methylphenyl)]
Examples thereof include a star burst type compound such as triaminotriphenylamine. (2-4) Organic light emitting layer Known organic light emitting materials can be used as the organic light emitting material used to form the organic light emitting layer.

For example, epidolidine, 2,5-bis [5
7-di-t-pentyl-2-benzoxazolyl] thiophene, 2,2 ′-(1,4-phenylenedivinylene)
Bisbenzothiazole, 2,2 '-(4,4'-biphenylene) bisbenzothiazole, 5-methyl-2- ｛2
-[4- (5-Methyl-2-benzooxazolyl) phenyl] vinyl} benzoxazole, 2,5-bis (5
-Methyl-2-benzoxazolyl) thiophene, anthracene, naphthalene, phenanthrene, pyrene, chrysene, perylene, perinone, 1,4-diphenylbutadiene, tetraphenylbutadiene, coumarin, acridine, stilbene, 2- (4-biphenyl) -6-phenylbenzoxazole, aluminum trisoxine,
Magnesium bisoxin, bis (benzo-8-quinolinol) zinc, bis (2-methyl-8-quinolinol)
Aluminum oxide, indium trisoxin,
Aluminum tris (5-methyloxin), lithium oxine, gallium trisoxin, calcium bis (5-chlorooxin), polyzinc-bis (8-hydroxy-5-quinolinolyl) methane, dilithium epindridione, zinc bisoxin, Examples include 1,2-phthaloperinone, 1,2-naphthaloperinone, and polyferrylenevinylene compounds.

Further, general fluorescent dyes such as a fluorescent coumarin dye, a fluorescent perylene dye, a fluorescent pyran dye, a fluorescent thiopyran dye, a fluorescent polymethine dye, a fluorescent mesocyanine dye, a fluorescent imidazole dye and the like can also be used. Among them, particularly preferred are chelated oxinoid compounds. The organic light-emitting layer may have a single-layer structure made of the fluorescent substance, or may have a multi-layer structure in order to adjust characteristics such as emission color and emission intensity. Also,
A mixture of two or more kinds of fluorescent substances may be formed, or a luminescent substance (for example, a fluorescent dye such as rubrene, coumarin, quinacridone or a quinacridone derivative) may be added to the above-mentioned organic luminescent material or hole transporting material, or electron transporting described later. The material may be doped.

The organic light emitting layer may be formed by vapor deposition of the above organic light emitting material, or may be formed by dip coating using a solution in which the organic light emitting material is dissolved or a solution in which the organic light emitting material is dissolved together with an appropriate resin. It may be formed by a coating method such as a spin coating method or a spin coating method. When formed by a vapor deposition method, the thickness may be about 1 nm to 200 nm. When formed by a coating method, the thickness may be about 5 nm to 500 nm.

As for the organic light emitting layer, as the film thickness is larger, it is necessary to increase the applied voltage for emitting light, so that the luminous efficiency is deteriorated and the organic electroluminescent display element is liable to be deteriorated. When the film thickness is small, the luminous efficiency is improved, but the breakdown is easy and the life of the organic electroluminescent display element is shortened. Therefore, the film may be formed in the above thickness range in consideration of the luminous efficiency and the life of the element. (2-5) Electron Transfer Related Layer As the electron transporting material for forming the electron transporting layer or the electron injecting and transporting layer, known materials can be used.

For example, 2- (4-biphenylyl) -5
-(4-tert-butylphenyl) -1,3,4-oxadiazole, 2- (1-naphthyl) -5- (4-t
tert-butylphenyl) -1,3,4-oxadiazole, 1,4-bis {2- [5- (4-tert-butylphenyl) -1,3,4-oxadiazolyl]} benzene, 1,3 -Bis {2- [5- (4-tert-butylphenyl) -1,3,4-oxadiazolyl]} benzene, 4,4'-bis {2- [5- (4-tert-butylphenyl) -1] , 3,4-oxadiazolyl]} biphenyl, 2- (4-biphenylyl) -5- (4-t
tert-butylphenyl) -1,3,4-thiadiazole, 2- (1-naphthyl) -5- (4-tert-butylphenyl) -1,3,4-thiadiazole, 1,4-
Bis @ 2- [5- (4-tert-butylphenyl)-
1,3,4-thiadiazolyl] {benzene, 1,3-bis} 2- [5- (4-tert-butylphenyl)-
1,3,4-thiadiazolyl]｝ benzene, 4,4 '―
Bis @ 2- [5- (4-tert-butylphenyl)-
1,3,4-thiadiazolyl]｝ biphenyl, 3- (4
-Biphenylyl) -4-phenyl-5- (4-ter
t-butylphenyl) -1,2,4-triazole, 3
-(1-Naphthyl) -4-phenyl-5- (4-ter
t-butylphenyl) -1,2,4-triazole,
1,4-bis @ 3- [4-phenyl-5- (4-ter
t-butylphenyl) -1,2,4-triazolyl]｝
Benzene, 1,3-bis @ 3- [4-phenyl-5-
(4-tert-butylphenyl) -1,3,4-oxadiazolyl] {benzene, 4,4′-bis} 2- [4
-Phenyl-5- (4-tert-butylphenyl)-
1,3,4-oxadiazolyl] biphenyl, 1,
3,5-Tris {2- [5- (4-tert-butylphenyl) -1,3,4-oxadiazolyl]} benzene, 1,3-bis {2- [1-phenyl-5- (4-t
tert-butylphenyl) -1,3,4-triazolyl] {benzene, 4,4′-bis} 2- [1-phenyl-5- (4-tert-butylphenyl) -1,3,4
—Triazolyl]｝ biphenyl and the like. These may be used as a mixture of two or more. Further, among substances used as an organic light emitting material such as aluminum trisoxine, a substance having a relatively high electron transporting ability can be used.

The electron transporting layer or the electron injecting and transporting layer may be formed by evaporating the above electron transporting material, or may be a solution in which the electron transporting material is dissolved or a solution in which the electron transporting material is dissolved together with an appropriate resin. And may be formed by a coating method such as a dip coating method or a spin coating method. When formed by a vapor deposition method, the thickness is about 1 nm to 500 nm,
When formed by a coating method, the thickness may be about 5 nm to 1000 nm.

As for the electron transporting layer or the electron injecting / transporting layer, it is necessary to increase the applied voltage for emitting light as the film thickness increases, so that the luminous efficiency is deteriorated and the organic electroluminescent display element is liable to be deteriorated. When the film thickness is small, the luminous efficiency is improved, but the breakdown is easy and the life of the organic electroluminescent display element is shortened. Therefore, the film may be formed in the above thickness range in consideration of the luminous efficiency and the life of the element.

The electron injecting material for forming the electron injecting layer is preferably a material having a small work function of the electron injecting layer itself, such as aluminum, indium, magnesium, calcium, titanium, yttrium, lithium, gadolinium, ytterbium, and ruthenium. , Manganese and alloys thereof. Further, as those having the same effect, alkali metal or alkaline earth metal oxides, alkali metal or alkaline earth metal halides (eg, fluorides), alkali metal or alkaline earth metal silicate compounds, alkali metals or An organic metal salt of an alkaline earth metal, or an organic metal complex of an alkali metal or an alkaline earth metal can be given.

The alkali metal or alkaline earth metal contained in the oxide, halide, organometallic salt or organometallic complex includes lithium, beryllium, sodium, magnesium, potassium, calcium, rubidium, barium, strontium, cesium. Among them, lithium, magnesium, potassium, calcium, and cesium are particularly preferable because of good electron injecting property. You may use these metal oxides, metal fluorides, etc., or an organic metal salt or an organic metal complex.

As the organometallic salt or organometallic complex,
Acetylacetonate complex containing the above-mentioned metals, ethylenediamine complex salt, glycine complex salt, oxine complex, alpha-nitrosobetanaphthol complex, salicylate, salicylaldoxime complex, cuperon complex, benzoin oxime complex, bipyridine complex, phenanthroline complex, crown complex, Examples include a proline complex, a benzoylacetone complex, a divalent carboxylate, an aliphatic carboxylate, and the like.

Of these, acetylacetonate complexes, oxine complexes, salicylates, salicylaldoxime complexes, divalent carboxylate salts, and aliphatic carboxylate salts are particularly preferred because of their good electron injectability. The electron injection layer can be formed by a method such as vapor deposition or sputtering. When it is formed by a vapor deposition method, its thickness may be, for example, about 0.1 nm to 20 nm. Although the electron injection layer can improve the electron injection efficiency as the film thickness is thinner, it causes uneven electron injection and dark spots if it is too thin. On the other hand, when the film thickness is large, the luminous efficiency is rather deteriorated, and the life of the organic electroluminescence element is shortened. Therefore, the film may be formed in the above thickness range in consideration of the electron injection efficiency, the light emission efficiency, the life of the device, and the like. (2-6) Cathode The cathode is formed of a conductive material (for example, a metal material) containing a metal having a low work function. As a material for such a cathode, a material containing a metal having a work function of 4 eV or less is preferable, and examples thereof include magnesium, calcium, titanium, yttrium, lithium, gadolinium, ytterbium, ruthenium, manganese, and alloys containing them.

Although the electron injecting property is apt to decrease, the above-mentioned tin oxide, indium oxide, antimony oxide,
Use a conductive metal compound such as zinc oxide, zirconium oxide, ITO, or a metal alloy with a low work function to form a thin cathode, and cover this cathode with a transparent conductive metal compound. It is also possible to use. When such a cathode is employed, not only the anode but also the cathode can be made translucent.

When the cathode is formed, a desired light-transmitting property can be obtained by using such a conductive substance, using a method such as vapor deposition or sputtering, a sol-gel method, or a method such as dispersing and coating such a substance in a resin or the like. It can be formed so that the properties and conductivity are ensured. When a metal thin film having a small work function is used, the thickness of the cathode is preferably in the range of 10 nm to 500 nm from the viewpoints of conductivity and production stability, but from the viewpoint of ensuring light transmission, the range is 1 nm to 10 nm. It is preferably in the range of 1 nm to 8 nm, and more preferably 10 nm to
It is preferable to coat with a transparent conductive metal compound having a thickness of 500 nm. When a light-transmitting material such as a conductive metal oxide is used as the cathode, the thickness is preferably in the range of 10 nm to 300 nm. (2-7) Lead Portion A conductive material is used for a lead portion for connecting the anode and the cathode to a power source, respectively.

Some or all of the lead portions may be formed of a conductive film. The conductive film for the lead portion may be light-transmitting. The material of the transparent conductive film for the lead portion is 4 eV
Those having a work function larger than the degree are preferred, such as metals such as aluminum, vanadium, iron, cobalt, nickel, copper, zinc, tungsten, silver, tin, gold, and alloys thereof, as well as tin oxide and indium oxide. And conductive compounds such as conductive metal compounds such as metal oxides such as antimony oxide, zinc oxide and zirconium oxide, and solid solutions and mixtures thereof. Using such a conductive substance, a desired light-transmitting property and conductivity are ensured by using a technique such as vapor deposition, sputtering, or a sol-gel method, or a technique such as dispersing and applying the substance in a resin or the like. Then, a transparent conductive film for a lead portion may be formed. The thickness of the conductive film for the lead portion should be 1 nm to 30 n in order to obtain translucency.
m is preferable, and when it is made of a conductive compound such as a conductive metal compound, the thickness is preferably 1 nm to 300 nm.

Some or all of the lead portions may be lead wires. Examples of the lead wire include a nichrome wire, a gold wire, a copper wire, a platinum wire, and the like. (2-8) Sealing Film The sealing film is for preventing moisture and oxygen from entering each layer constituting the organic electroluminescent element, as described above.

As the material of the sealing film, MgO, SiO,
SiO ₂ , Al ₂ O ₃ , GeO, NiO, CaO, Ba
Metal oxides such as O, Fe ₂ O ₃ , Y ₂ O ₃ , TiO ₂ ,
Although metal fluorides such as MgF ₂ , LiF, AlF ₃ , and CaF ₂ can be exemplified, a conductive metal oxide such as the above-described conductive tin oxide may be used. Hereinafter, a production example of the organic electroluminescence element will be described. (Preparation Example 1) A 2 mm-wide acid-resistant tape was stuck on an ITO film of a commercially available glass substrate with an ITO film (manufactured by Nippon Sheet Glass Co., Ltd.), and a portion serving as an anode was masked. The portion of the ITO film that was not masked with the acid-resistant tape was etched in a hot dilute hydrochloric acid solution to form an anode having a predetermined pattern on the glass substrate. After the etching, the ITO film (anode) having a predetermined pattern was washed with running water and an organic solvent, and then ultrasonically washed in a surfactant aqueous solution for 15 minutes. Thereafter, the ITO film was irradiated with light from an excimer lamp for 5 minutes, and exposed to oxygen plasma for 10 minutes to clean the surface.

The glass substrate with the ITO film thus washed is set on a holder in a film forming apparatus, and is irradiated with N, N under a vacuum of 1.0 × 10 ⁻⁵ Torr or less using a mask of a light emitting pattern. '-Diphenyl-N, N'-bis (3-methylphenyl) -1,1'-diphenyl-4,4'-diamine was deposited at a deposition rate of 1 / sec to a thickness of 60 nm by a resistance heating method. A hole injection transport layer was formed.

Subsequently, a tris (8-hydroxyquinoline) aluminum complex was added at a deposition rate of 1 ° / sec for 60 n.
The organic light emitting layer was formed by forming m layers. Next, the mask pattern was changed, and Mg and Ag were used as evaporation sources at a deposition rate of 10: 1 by a co-evaporation of a resistance heating method at about 200: 1
A nm-thick deposited film was formed. Thus, a cathode and a lead portion from the cathode to a power source were formed on the organic light emitting layer.

Next, in a glove box filled with nitrogen, a washed glass substrate was placed on the element prepared as described above, and the periphery of both glass substrates was sealed with an ultraviolet curing resin. The sealed element was taken out of the glove box and irradiated with ultraviolet rays for 200 seconds to cure the sealing resin.

As a result, an organic electroluminescent device having a transparent anode, an organic light emitting layer and a reflective cathode was obtained. This organic electroluminescent element
For example, it can be used in the mirror screen display device of the present invention. (Preparation Example 2) In the same manner as in Preparation Example 1, I
The TO film was etched into a predetermined pattern to form an anode having a predetermined pattern. Thereafter, a hole injection / transport layer and an organic light emitting layer were sequentially formed on the anode in the same manner as in Preparation Example 1.

Subsequently, an ITO vapor deposition layer having a thickness of about 200 nm was formed on the organic light emitting layer by a helicon sputtering method using ITO as a vapor deposition source and a mask having a predetermined pattern.
Thus, a cathode and a lead portion from the cathode to a power source were formed on the organic light emitting layer. Next, in a glove box filled with nitrogen, a washed glass substrate was placed on the element prepared as described above, and the periphery of both glass substrates was sealed with an ultraviolet curable resin.

The sealed element was taken out of the glove box and irradiated with ultraviolet rays for 200 seconds to cure the sealing resin. As a result, an organic electroluminescent element having both electrodes transparent and translucent as a whole was obtained. This organic electroluminescence element can be used, for example, in the high mount stop display device of the present invention. (Preparation Example 3) In the same manner as in Preparation Example 1, I
The TO film was etched into a predetermined pattern to form an anode having a predetermined pattern. Thereafter, a hole injection / transport layer and an organic light emitting layer were sequentially formed on the anode in the same manner as in Preparation Example 1.

Subsequently, a vapor deposition film having a thickness of about 200 nm was formed at a vapor deposition rate of 10: 1 at a vapor deposition rate of 10: 1 using a mask having a predetermined pattern by using Mg and Ag as vapor deposition sources. Thus, a cathode was formed on the organic light emitting layer. Subsequently, an ITO vapor deposition layer having a thickness of about 200 nm was formed on the organic light emitting layer by a helicon sputtering method using ITO as a vapor deposition source and using a mask having a predetermined pattern. Thus, a lead portion from the cathode to the power supply was formed on the organic light emitting layer.

Next, in a glove box filled with nitrogen, a washed glass substrate was placed on the element prepared as described above, and the periphery of both glass substrates was sealed with an ultraviolet curing resin. The sealed element was taken out of the glove box and irradiated with ultraviolet rays for 200 seconds to cure the sealing resin.

As a result, an organic electroluminescence device having an anode, a hole injection / transport layer, an organic light emitting layer and a cathode was obtained. This organic electroluminescence element is opaque only at the cathode portion, and can be used, for example, in the high mount stop display device of the present invention. (3) Next, a head-up display device, a display device in a mirror screen, and a high-mount stop display device of the present invention for displaying information using the above-described organic electroluminescence element will be described with reference to the drawings. (3-1) Head-up display device FIG. 10 shows a head-up display device D1 of the present invention.
1 shows a schematic configuration diagram of an automobile including:

The head-up display device D1 includes a light source (projection source, projection source) 81 for projecting light, and a screen 82 for receiving light from the light source 81 and displaying information. The light source 81 has an organic electroluminescence element 811, and can project light toward a screen 82 using light emission from the organic electroluminescence element. The organic electroluminescence element 811 has a structure capable of simple matrix driving. Organic electroluminescence element 811
Has an anode, a cathode, and an organic light-emitting film sandwiched between these electrodes. The anode and the cathode are each composed of a plurality of strip-shaped electrodes arranged in parallel at fine intervals. The strip electrodes forming the anode and the strip electrodes forming the cathode face each other so as to be orthogonal to each other. By applying a predetermined voltage between one of the plurality of strip electrodes forming the anode and one of the plurality of strip electrodes forming the cathode, light is emitted from the organic light emitting film portion where these strip electrodes intersect. Can be. When displaying information, one of the anode and the cathode is used as a scanning electrode, and the other is used as a signal electrode, and a voltage is applied as follows. A voltage is sequentially applied to each of the strip electrodes constituting the scanning electrodes. For the signal electrode, the display image and
A voltage corresponding to the image data is applied to each strip electrode in accordance with the scanning strip electrode to which the voltage is applied. With respect to the signal electrode, a voltage is applied to one or two or more strip electrodes according to a display image or the like. By driving the organic electroluminescence element 811 in a simple matrix in this manner, light can be emitted in an arbitrary pattern according to the information image. As a result, arbitrary characters, graphics, and the like can be displayed on the screen 82. Light from the organic electroluminescence element may be enlarged and projected on a screen using an optical system such as a lens.

The screen 82 is arranged between the driver's seat 91 and the front window 92. Screen 8
2 is a front window 9 viewed from the driver of the car.
2 are arranged so as to overlap with each other. The screen 82 is translucent so that the car driver can also see the foreground through the screen 82. The projection of the light from the light source 81 is controlled by the control device 832 via the drive device 831 as shown in FIG. In this example, the screen 82 displays information on the traveling speed of the automobile, information on the engine speed, and the like. Therefore, the control device 832 includes the speed measuring device 83
3, the speed information is input, and the engine speed measurement device 8
The rotation speed information is input from 34. The control device 832 receives luminance information from an environmental luminance measuring device 835 for measuring the environmental luminance. The controller 832 causes the light source 81 to emit light at a luminance according to the environmental luminance. The control device 832 is further connected to an input device 836 for the user to input information related to the display information. The input device 836 can be used as follows, for example. For example, when the user inputs the distance to the destination or the like from the input device 836, the remaining distance to the destination is displayed on the screen 82, and if necessary, refueling is required based on the remaining distance and the remaining fuel amount. That is, it can be displayed on the screen 82.

In the head-up display device D1, speed information, engine speed information, and the like are displayed on a screen 82 by light projection from a light source 81. The driver of the car can obtain such information with a relatively small viewpoint movement. Since the head-up display device D1 of the present invention uses an organic electroluminescence element, color display can be performed, and accordingly, visibility is good. Since the light emission luminance from the light source 81 is controlled based on the luminance information from the environmental luminance measurement device 835, it does not hinder the driver from checking the foreground even at night or the like. Since the light source 81 emits light using the organic electroluminescence element 811, the light source 81 does not need to step up the supply voltage (normally 12 V DC) from the battery provided in the vehicle.
The organic electroluminescence element can emit light to display information.

As in a head-up display device D2 shown in FIG. 12, the front window 92 itself may be used as a screen. When relatively complicated information such as a map or text is displayed on the front window 92, it is preferable that a process such as translucent processing is performed on the front window portion serving as a screen by reflection processing. When relatively simple information such as a digital display of a speedometer is displayed on the front window 92, the front window may be used as it is as a screen. (3-2) Mirror Screen Display Device FIG. 13 is a front view of the mirror screen display device D3 of the present invention. FIG. 14 is a cut-away perspective view of the in-mirror screen display device D3.

The in-mirror display device D3 shown in FIGS. 13 and 14 is a device for displaying information superimposed on the image of the object to be observed observed by the mirror. In this example, the information is displayed so as to be superimposed on the observed object image of the rearview mirror for the driver of the automobile to check backward. In this example, the letters “STOP” are displayed on the image of the observation object in the rearview mirror.

The display device D3 in the mirror screen is a frame 8
4, a reflector 85 for a mirror, an organic electroluminescent element 86 and a transparent glass 87. The frame 84 has a rectangular parallelepiped shape having an opening, and a mirror reflector 85 is disposed on an inner bottom surface thereof. The organic electroluminescence element 86 is provided with the mirror reflector 8.
5. The transparent glass 87
4 opening.

Organic EL device 86
In this example, the reflective cathode 861 formed on the mirror reflector 85, the transparent organic light emitting film 862, and the transparent anode 86
Consists of three. In this example, the organic electroluminescent element 86 is formed in a pattern corresponding to each character pattern in order to display each character “STOP”.

Organic Electroluminescence Element 86
In this example, based on a signal from a distance sensor (not shown) embedded in the rear bumper of the vehicle, its light emission /
Non-light emission is controlled. When the distance sensor detects that the distance to any article has become equal to or less than a predetermined distance, the organic electroluminescence element 86 emits light. As a result, the letters "STOP" are displayed in the mirror screen. Organic electroluminescence element 8
6 does not emit light, the anode 863 and the organic light emitting film 862 are transparent, and the cathode 862 is reflective. Therefore, the in-mirror screen display device D3 is connected to a normal mirror (here, a rearview mirror). It has the same function. For the same reason, it does not detract from the design aesthetics.

When the driver moves the car backward while looking at the display device D3 of the present invention also serving as a rearview mirror, if the driver approaches the article such as another car behind, too, the rear view reflected on the mirror. To "ST
"OP" is displayed. Thereby, the instruction information can be transmitted to the driver to stop the backward movement. Therefore, the display device D3 of the present invention can be used as an alarm device when the vehicle is moved backward as described above. The display device in the mirror screen of the present invention may, of course, be able to display other information in addition to such instruction information.

The in-mirror display device of the present invention can be used not only as a rearview mirror but also as a side mirror of an automobile as shown in FIG. 15, for example. (3-3) High Mount Stop Display Device FIG. 16 shows a high mount stop display device D4 of the present invention.
1 shows a rear view of a motor vehicle provided with a.

The high mount stop display device D4 is a device for displaying that the driver is applying a brake, in other words, that the driver is braking. Display device D
4 is located relatively above the car. In this example, the display device D4 is disposed on the indoor side on the rear window 93 made of half mirror glass. The high mount stop display device D4 has an organic electroluminescence element 88. In this example, as shown in FIG. 17, a transparent anode 881 and an organic light emitting film 88 are arranged in this order from the rear window side.
2. The cathode 883 is stacked. Cathode 883
Is reflective. When a voltage is applied between the anode 881 and the cathode 883, the organic light emitting layer 882 emits red light.
This light emission indicates that braking is in progress.

Since the cathode 883 is used as a reflection electrode, even if the organic electroluminescence element 88 is arranged on the rear window 93 made of half mirror glass, the external design is not damaged. Further, the light from the organic light emitting layer 882 can be efficiently guided to the vehicle behind. Further, it is possible to prevent light from the organic light emitting layer 882 from entering the vehicle and hindering driving.

When the high-mount stop display device having the organic electroluminescent element of the present invention is arranged on a rear window made of transparent glass, the organic electroluminescent element may be entirely translucent. . In this way, when the driver checks the rear through the rear window, the organic electroluminescent element 88 does not hinder the driver. Also, the appearance design is not spoiled.

[0084]

The present invention can provide a display device which can be mounted on a vehicle and used for displaying information, and which is inexpensive, has good visibility, and is capable of full-color display. .

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram of an example of an organic electroluminescence element provided in a display device of the present invention.

FIG. 2 is a schematic configuration diagram of another example of the organic electroluminescence element provided in the display device of the present invention.

FIG. 3 is a schematic configuration diagram of still another example of the organic electroluminescence element provided in the display device of the present invention.

FIG. 4 is a schematic configuration diagram of still another example of the organic electroluminescence element provided in the display device of the present invention.

FIG. 5 is a schematic configuration diagram of still another example of the organic electroluminescence element provided in the display device of the present invention.

FIG. 6 is a schematic configuration diagram of still another example of the organic electroluminescence element provided in the display device of the present invention.

FIG. 7 is a schematic configuration diagram of still another example of the organic electroluminescence element provided in the display device of the present invention.

FIG. 8 is a schematic configuration diagram of still another example of the organic electroluminescence element provided in the display device of the present invention.

FIG. 9 is a schematic configuration diagram of still another example of the organic electroluminescence element provided in the display device of the present invention.

FIG. 10 is a schematic side view of an automobile including an example of a head-up display device according to the present invention.

11 is a schematic block diagram of devices related to information display when information is displayed on the head-up display device shown in FIG.

FIG. 12 is a schematic side view of an automobile provided with another example of the head-up display device according to the present invention.

FIG. 13 is a schematic front view of an example of the in-mirror display device according to the present invention.

FIG. 14 is a cutaway perspective view of the display device in a mirror screen shown in FIG. 14;

FIG. 15 is a schematic front view of another example of the in-mirror display device according to the present invention.

FIG. 16 is a schematic rear view of an automobile provided with an example of the high mount stop device according to the present invention.

17 is a schematic sectional view of a rear window portion of the automobile shown in FIG.

[Explanation of symbols]

A, B, C, D, E, F, H, I, J Electroluminescence device 1 Anode 21 Hole injection layer 22 Hole transport layer 23 Hole injection transport layer 3 Organic light emitting layer 41 Electron transport layer 42 Electron injection layer 43 Electron injection / transport layer 5 Cathode 6 Blocking layer 71 Sealing film 72 Sealing resin 73 Sealing glass PS Power supply D1, D2 Head-up display device 81 Light source 811 Organic electroluminescent element 82 Screen D3 Mirror display device 84 Frame 85 Mirror Reflector 86 organic electroluminescent element 87 glass D4 high mount stop display device 88 organic electroluminescent element 91 driver's seat 92 front window 93 rear window

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Yoshihisa Terasaka 2-13-13 Azuchicho, Chuo-ku, Osaka-shi, Osaka Inside Osaka International Building Minolta Co., Ltd. 2-3-1-3 Osaka International Building Minolta Co., Ltd. F-term (reference) 3K039 AA01 LB01 LB09 LB10 LD09 LE02 LE11 MB00 MC08 NA02 QA07 5C094 AA12 BA07 BA29 CA24 ED11 HA05 5G435 AA01 BB05 BB17 BB19 CC12 GG17 GG25 GG27GG27

Claims (16)

[Claims] 1. A head-up display device for projecting light on a predetermined screen arranged in front of a driver's seat of a vehicle to display information, wherein the light is projected using an organic electroluminescence element. A head-up display device characterized by the above-mentioned. 2. The head-up display device according to claim 1, wherein the screen is a front window of an automobile. 3. The head-up display device according to claim 1, wherein said screen is a translucent screen disposed between a front window of a vehicle and a driver's seat. 4. A display device in a mirror screen for displaying information superimposed on an image of an object to be observed observed by a mirror, comprising:
An in-mirror display device comprising: a mirror reflector having a reflection surface; and an information display organic electroluminescence element arranged to overlap the reflection surface. 5. The mirror according to claim 4, wherein said organic electroluminescent element has an anode, an organic light-emitting film, and a cathode, and one of said anode and said cathode is a light-reflective reflective electrode. In-screen display device. 6. The display device according to claim 4, wherein the organic electroluminescence element has a light transmitting property as a whole. 7. An information display device mounted on a vehicle and displaying information based on detection information of a sensor provided on the vehicle.
7. The display device in a mirror screen according to any one of items 1 to 6. 8. The display device according to claim 4, wherein the mirror is a rearview mirror of an automobile. 9. The display device according to claim 4, wherein the mirror is a side mirror of an automobile. 10. A high-mount stop display device arranged at the rear of a vehicle for indicating that a brake is being applied, wherein information is displayed by an organic electroluminescence element. 11. The high-mount stop display device according to claim 10, wherein the high-mount stop display device is arranged on a rear window of a vehicle. 12. The high mount stop display device according to claim 10, wherein said organic electroluminescence element has a light transmitting property as a whole. 13. The organic electroluminescence device according to claim 10, further comprising an anode, an organic light-emitting film, and a cathode, wherein one of the anode and the cathode is a light-reflective reflective electrode. High mount stop display device. 14. The organic electroluminescence device according to claim 10, wherein the organic electroluminescent device has a light-transmitting substrate, an anode, an organic light-emitting film, and a cathode, and the light-transmitting substrate is a rear window made of a half mirror glass of an automobile. The high mount stop display device as described in the above. 15. The high-mount stop display device according to claim 14, wherein one of said anode and said cathode is a light-reflective reflective electrode. 16. The organic electroluminescence device has a light-transmitting substrate, an anode, an organic light-emitting film, and a cathode, and the organic electroluminescence device has a light-transmitting property as a whole. 11. The high mount stop display device according to claim 10, wherein the optical substrate is a rear window made of a translucent glass of an automobile.