JP2005326757A - Dual light-emitting organic electroluminescence display apparatus and imaging apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a dual light emitting organic electroluminescence display apparatus in which a dual light emitting organic electroluminescence element is used and reflecting/heat radiating structure is tightly adhered to one surface of a panel composed of the element, to reflect emitted light and cool the surface, and consequently, the surface luminance of display of the panel can be increased normally and the life time can be extended. <P>SOLUTION: A cover, being a reflecting member and comprising the reflection/heat radiation structure having a heat radiation function, is attached with a hinge to one surface of the panel, composed of the dual light emitting organic electroluminescence element which is formed by layering light-emitting layers between a light-transmitting cathode electrode and a transparent anode electrode. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a double-sided light emitting organic electroluminescence (EL) display device and an image pickup device. Specifically, a reflective / heat dissipating structure cover is attached to one side of a panel composed of double-sided light emitting organic electroluminescence elements, and normal display is performed. The present invention relates to a double-sided light emitting organic electroluminescence display device and an image pickup device in which only one side is displayed at the time, and the two-sided display is made possible by removing the cover at the time of facing shooting.

Video cameras and digital still cameras using many direct-view displays (mainly using a liquid crystal display device) have a face-to-face shooting mode in which the display is directed to the subject side and the image can be confirmed on the subject side. A normal organic electroluminescence display device is also basically used for single-sided light emission, and uses the same signal processing (upside down writing direction) as a liquid crystal that displays a horizontally reversed image on the subject side. .
Regarding the organic electroluminescence display device, there are a bottom emission method and a top emission method in the light emission direction, and there is no great difference in the light emission structure itself, but the light extraction direction is reversed.

As shown in FIG. 11 and FIG. 12, the organic electroluminescence light-emitting element is formed by forming a thin film positive hole transport layer 113 on a transparent anode electrode 112 generally formed on a transparent glass substrate 111, and forming the positive electrode. A light emitting layer 114 of a fluorescent material is laminated on the hole transport layer 113, a thin electron transport layer 115 is formed thereon, and a metal cathode electrode 116 is further formed thereon.
As shown in FIG. 11, the organic electroluminescence light emitting element having such a structure can be driven by direct current by applying a direct current voltage of a direct current power source 117, but can also be driven by alternating current or pulse. When a voltage is applied, the light emitting layer 114 emits light, and the light is emitted from the anode electrode 112 side as indicated by an arrow because the cathode electrode 116 is not translucent.

FIG. 13 shows a so-called bottom emission organic electroluminescence light-emitting element in which light is emitted in the lower direction of the organic electroluminescence light-emitting element. Al wiring 118 is applied on a glass substrate 111, A transparent anode electrode 112 made of ITO is laminated, a light emitting layer 114 is laminated on the next layer, and a cathode electrode 116 formed of a metal that shields light is laminated on the uppermost layer.
In the organic EL device having the bottom emission structure configured as described above, the cathode electrode 116 is formed of metal and the anode electrode 112 is formed of a transparent member. Therefore, the light emitted from the light emitting layer 114 is emitted from the anode electrode 112. Radiated in the direction of the arrow on the side.

FIG. 14 shows a so-called top emission organic electroluminescence light-emitting element in which light is emitted in the upper direction of the organic electroluminescence light-emitting element. An Al wiring 118 is applied on a glass substrate 111, and an upper portion thereof is provided. A metal anode electrode 112a is laminated, a light emitting layer 114 is laminated on the next layer, a light transmissive cathode electrode 116a is laminated on the upper layer, a protective layer 118 is provided thereon, and light is transmitted to the top. The transparent seal 119 is applied.
In the organic electroluminescence light emitting device having the top emission structure having such a configuration, the cathode electrode 116 is formed of a light transmissive member, and the anode electrode 112a is formed of metal. Radiated in the direction of the arrow on the cathode electrode 116a side.

  In such a face-to-face shooting mode using a single-sided light-emitting device using an organic electroluminescence light-emitting element having a bottom emission structure or a top emission structure, the display surface is directed to the subject side. is required. At present, the image is recognized on the photographer side by lighting it on the electronic viewfinder and looking through it.

In addition, the double-sided light emitting organic electroluminescence element has a top emission structure and a bottom emission structure, thereby enabling double-sided light emission display.
In the face-to-face shooting mode using such a double-sided light emitting element, a recorded image can be displayed on the subject side and an image whose image recognition is reversed horizontally on the subject side without any special signal operation.
Further, in double-sided light emission, only a double-sided light-emitting panel can be used to recognize images on the photographing side, subject side, and no additional display device is required.
Japanese Patent Laid-Open No. 2001-332392 (pages 3-4)

However, the organic electroluminescence elements described in the prior art have disadvantages in that the light emission life is not sufficient and the power consumption due to the insufficient light emission effect is larger than that of the liquid crystal.
In addition, in the organic electroluminescence display device, the light emission itself is current driven, and the current consumption is larger than the voltage driven liquid crystal, and therefore heat generation in the light emitting area is large.
Regarding the organic electroluminescence display device, this heat generation is one of the factors that deteriorate the light emission lifetime. Therefore, it is necessary to sufficiently consider the heat dissipation of the display device in order to ensure the light emission life.
Furthermore, since the double-sided light emitting organic electroluminescence display device has double-sided light emission, it usually cannot have a heat dissipation structure on the back surface, and there is no other method than relying on direct outside air cooling.

  In addition, in a normal single-sided organic electroluminescence display device, a reflective surface is placed on the non-light-emitting side to improve brightness. However, in a double-sided light-emitting structure, the reflective surface cannot be placed, resulting in a decrease in luminous efficiency and visibility. Decreases. In order to compensate for this, there is only a method for increasing the luminance, which has the problem that the power consumption increases, the lifetime decreases, and the temperature increases.

  Therefore, only in the face-to-face shooting mode, both sides should be exposed and double-sided light emission display should be performed. Otherwise, light emission and reflection should be performed on one side, and heat radiation cover should be closely attached to improve luminous efficiency and heat radiation effect. Has a problem.

  In order to solve the above-described problems, a double-sided light emitting organic electroluminescence display device and an imaging device according to the present invention are configured as follows.

(1) A double-sided light-emitting electroluminescent display device is provided on one side of a panel composed of a double-sided light-emitting organic electroluminescent element that is configured by laminating a light-emitting layer between a light-transmitting cathode electrode and a transparent anode electrode. A reflection / heat dissipation structure cover that is a reflection member and has a heat dissipation function is attached.
(2) The double-sided organic electroluminescence display device according to (1), wherein the cover is attached to the panel by a hinge.
(3) The double-sided organic electroluminescence display device according to (1), wherein the cover shields light emitted from the anode electrode side of the panel.
(4) The double-sided light emitting organic electroluminescence display device according to (1), wherein the cover is detachable from the panel.

(5) The double-sided light emitting organic electroluminescence display device is a reflective member incorporated in the main body and has a heat dissipation function, and a light emitting layer is laminated between a light-transmitting cathode electrode and a transparent anode electrode. In other words, it is attached so as to shield one side of a panel composed of a double-sided light emitting organic electroluminescence element.
(6) The double-sided light emitting organic electroluminescence display device according to (5), wherein the panel is attached to the reflection / heat dissipation structure with a hinge.
(7) The double-sided organic electroluminescence display device according to (5), wherein the reflective / heat-dissipating structure shields light emitted from the anode electrode side of the panel.
(8) The double-sided light emitting organic electroluminescence display device according to (5), wherein the reflective / heat radiating structure is detachable from the panel.

(9) The image pickup apparatus is an image pickup apparatus including a display unit, and the display unit is a double-sided light emitting type configured by laminating a light emitting layer between a light transmissive cathode electrode and a transparent anode electrode. A reflection / heat radiation structure cover that is a reflective member and has a heat radiation function is attached to one side of a panel made of an organic electroluminescence element.
(10) The imaging apparatus according to (9), wherein the cover is attached to the panel by a hinge.
(11) The imaging apparatus according to (9), wherein the cover shields light emitted from the anode electrode side of the panel.
(12) The imaging apparatus according to (9), wherein the cover is detachable from the panel.

(13) The image pickup apparatus is an image pickup apparatus including a display unit, and the display unit is a reflective member incorporated in the main body and has a heat dissipation function. It is attached so that the single side | surface of the panel which consists of a double-sided light emission type organic electroluminescent element comprised by laminating | stacking a light emitting layer between anode electrodes may be shielded.
(14) The imaging apparatus according to (13), wherein the panel is attached to the reflection / heat dissipation structure with a hinge.
(15) The imaging apparatus according to (13), wherein the reflection / heat dissipation structure shields light emitted from the anode electrode side of the panel.
(16) The imaging apparatus according to (13), wherein the reflection / heat dissipation structure is detachable from the panel.

As described above, according to the present invention, the reflective / heat dissipating structure cover is attached to one side of a panel composed of a double-sided light emitting organic electroluminescence element, so that the reflected light emission is reflected during normal shooting. The brightness of the panel can be further increased.
In addition, improved display efficiency can be expected to improve power consumption and service life.
By adding a cover for the reflective / heat-dissipating structure, it is possible to keep the temperature rise of the display surface low, so it is expected to improve the life of organic electroluminescence light-emitting elements, which are said to accelerate the life reduction due to temperature rise. it can.
In addition, the heat capacity of the display device is reduced by adding a cover for the reflective / heat-dissipating structure, and unevenness of the display element is expected to be suppressed by reducing partial thermal imbalance (thermal gradient between the display and non-display areas). it can.

Next, embodiments of a dual emission organic electroluminescence display device and an imaging device according to the present invention will be described below with reference to the drawings.
The feature of the present invention is that a panel composed of a double-sided light emitting organic electroluminescence element is used, and a reflective / heat dissipating structure is attached to one side of the panel, so that both sides are exposed only in the face-to-face shooting mode, and double-sided light emission is performed. The display is performed, and other than that, the reflective / heat dissipating structure is brought into close contact with one side to improve the light emission efficiency and the heat dissipation effect.

  As shown in FIG. 1, the double-sided light emitting organic electroluminescence device has a structure in which an Al wiring 12 is provided on a glass substrate 11, an ITO transparent anode electrode 13 is laminated thereon, and a light emitting layer 14 is provided thereon. The light-transmitting cathode electrode 15 is laminated on the upper part, the protective layer 16 is laminated on the upper part, and the transparent seal 17 is applied on the uppermost part.

The transparent protective layer 16 on the cathode electrode 15 side is directly exposed or further added with a glass protective layer.
However, there is no reflection / heat dissipating structure, and heat is dissipated from the air of the panel itself.
However, since the frequency of use of the face-to-face shooting mode itself is considered to be low, the effect of increasing the light emission efficiency and the heat dissipation effect is great when used in normal shooting.

When a predetermined current is applied to the light-emitting layer 14 in a panel composed of a double-sided light-emitting organic electroluminescent element having such a structure, the light-emitting layer 14 itself emits light, and the light passes through the light-transmitting cathode electrode 15. Irradiate upward. On the other hand, the light emitted from the light emitting layer 14 itself is transmitted through the glass substrate 11 via the transparent anode electrode 13 on the lower side and is also irradiated in the lower direction.
In this way, light emitted from the light emitting layer 14 can be emitted to both the anode electrode 13 side and the cathode electrode 15 side.

  As the reflection / heat dissipation structure, a metal, a resin, or a combination of these that has good optical reflection and good thermal conductivity is used. Specifically, the reflection / heat dissipation structure 20A of the first specific example has a reflection color of aluminum (Al) or aluminum alloy as much as possible as shown in FIG. The metal 21 is colored and has good thermal conductivity. Alternatively, an achromatic resin having a high thermal conductivity and a reflection color as much as possible is used.

As shown in FIG. 3, the reflective / heat dissipating structure 20B of the second specific example is capable of reflecting colors such as copper (Cu) such as copper (Cu) and aluminum (Al) or aluminum (Al) alloy having excellent thermal conductivity. As much as possible, a metal 23 having a neutral color and good thermal conductivity is laminated.
As shown in FIG. 4, the reflective / heat radiating structure 20C of the third specific example includes a metal 23 having excellent thermal conductivity, such as copper (Cu), and a resin 24 having an achromatic color and an excellent reflectance as much as possible. Are pasted together.
As shown in FIG. 5, the reflection / heat dissipation structure 20D of the fourth specific example is a laminate of a resin 25 having excellent thermal conductivity and a resin 26 having a reflection color that is as neutral and highly reflective as possible. is there.

The double-sided light emitting organic electroluminescence display device according to the first embodiment of the present invention can be applied to a so-called imaging device having a function of imaging, which is provided in the main body 30 as shown in FIG. The double-sided light-emitting organic electroluminescence panel 10 made of a double-sided light-emitting organic electroluminescence element has a structure in which a cover that is a reflection / heat dissipation structure 20 is attached to the double-sided light-emitting organic electroluminescence panel 10 using a hinge 27. This is a panel support method often used in current video cameras, in which a display is pulled out to the side using a hinge 27.
The double-sided light emitting organic electroluminescence element has a structure that emits light on both sides of the structure shown in FIG. 1 described above, and the reflection / heat dissipation structure 20 is shown in FIG. 2, FIG. 3, FIG. 4, and FIG. Any one of the structures or a structure corresponding to it.

The cathode electrode 15 side light emission 28 with a high aperture ratio is set as the main display side, and the anode electrode 13 side light emission 29 with the aperture ratio slightly falling across the TFT pattern is set as the facing display side.
As shown in FIG. 7, the anode electrode 13 side light emission 29 has a structure in which the reflection / heat dissipation structure 20 having excellent reflectivity and thermal conductivity is closely attached, and reflects light emission and absorbs heat generated in display. Diversify, improve luminous efficiency and cool the panel.
The reflecting / dissipating structure 20 is fixed to one side by a hinge or the like, and is usually brought into close contact with the double-sided light emitting organic electroluminescence panel 10 and is flipped upward in the face-to-face shooting mode to expose the reflection-side display surface. It has a structure for performing double-sided display.

  Further, since the reflection / heat dissipation structure 20 has an eaves structure with respect to the upper side, there is an effect of improving the visibility in the outdoors.

FIG. 8 shows a modification of the attachment of the reflection / heat dissipation structure. The reflection / heat dissipation structure 20 is attached to one side of the double-sided light emitting organic electroluminescence panel 10, and the reflection / heat dissipation structure is further shown. The drive board 31 is mounted on the back surface of the board 20, and a casing 32 that also serves as heat dissipation is mounted around the drive board 31.
With such a structure, the reflection / heat dissipation structure 20 attached in close contact with one side of the double-sided light emitting organic electroluminescence panel 10 is further improved by reflecting light emitted from the double-sided light emitting organic electroluminescence panel 10. The obtained brightness can be obtained and the panel itself can be cooled. Further, the housing 32 provided on the back part can dissipate the heat radiated by the reflection / heat radiation structure 20 to the outside.

  Next, a double-sided light emitting organic electroluminescence display device and an imaging device according to a second embodiment of the present invention will be described below with reference to the drawings.

The double-sided light emitting organic electroluminescence display device of the second embodiment can be applied to a so-called image pickup device having a function of taking an image, which is a double-sided light emission type provided in the main body 30 as shown in FIG. With respect to the double-sided light emitting organic electroluminescence panel 10 made of an organic electroluminescence element, a cover which is a reflection / heat dissipation structure 20a is detachably attached to the anode electrode side.
The double-sided light emitting organic electroluminescence element has a structure that emits light on both sides of the structure shown in FIG. 1 described above, and the reflection / heat dissipation structure 20 is shown in FIG. 2, FIG. 3, FIG. 4, and FIG. Any one of the structures or a structure corresponding to it.
In an apparatus having such a structure, when using only one side of the display, that is, when only the cathode electrode side light emission 28 is used, the reflection / heat radiation structure 20a is attached with the cover attached. In the structure 20a, the anode electrode side light emission 29 generated in the double-sided light emitting organic electroluminescence panel 10 is reflected, and the anode electrode side light emission 29a reflected in the same direction as the cathode electrode side light emission 28 is emitted. Brightness is improved. At the same time, the double-sided light emitting organic electroluminescence panel 10 can be cooled by the reflection / heat dissipation structure 20a.
When face-to-face photography is performed, that is, when both the anode electrode side light emission 29 and the cathode electrode side light emission 28 are used, face-to-face photography can be easily performed by removing the cover that is the reflection / heat dissipation structure 20a.

  Next, a double-sided light emitting type electroluminescent display device and an imaging device according to a third embodiment of the present invention will be described with reference to the drawings.

The double-sided light emitting organic electroluminescence display device of the third embodiment can be applied to a so-called image pickup device having a function of taking an image, and as shown in FIG. The structure 20b is incorporated, and the anode electrode side light emitting surface of the double-sided light emitting organic electroluminescence panel 10A is attached in close contact with the reflection / heat radiation structure 20b in a hinge shape.
The double-sided light emitting organic electroluminescence element has a structure that emits light on both sides of the structure shown in FIG. 1 described above, and the reflection / heat dissipation structure 20 is shown in FIG. 2, FIG. 3, FIG. 4, and FIG. Any one of the structures or a structure corresponding to it.

In the apparatus having such a structure, the light emission by both the cathode electrode side light emission 28 and the reflected anode electrode side light emission 29a can be obtained with the double-sided light emitting organic electroluminescence panel 10A stored in the normal photographing.
At the time of face-to-face photography, the photographer side can see the anode electrode side light emission 29a and the subject side can see the cathode electrode side light emission 28a by jumping upward with the hinge portion of the double-sided light emitting organic electroluminescence panel 10A as a fulcrum.
Here, the double-sided light emitting organic electroluminescence panel 10A is flipped upward with the hinge portion as a fulcrum, but the structure is not limited to this, and for example, a structure of pulling out in the left-right direction with respect to the camera body may be used.

  Attach a double-sided organic electroluminescence panel by attaching a cover that is a reflective / heat-dissipating structure to one side of a panel that consists of a double-sided light-emitting organic electroluminescent element By reflecting the emitted light, the brightness of the panel can be increased during normal shooting, and the temperature rise of the display surface can be kept low. Provided are a double-sided light emitting organic electroluminescence display device and an imaging device that can be expected to improve the life of the organic electroluminescence light emitting device.

It is explanatory drawing which showed the structure of the double-sided emission type organic electroluminescent element which concerns on this invention. It is explanatory drawing which showed an example of the reflective and heat radiating structure which concerns on this invention. It is explanatory drawing which showed an example of the reflective and heat radiating structure which concerns on this invention. It is explanatory drawing which showed an example of the reflective and heat radiating structure which concerns on this invention. It is explanatory drawing which showed an example of the reflective and heat radiating structure which concerns on this invention. It is explanatory drawing which shows the double-sided light emission type organic electroluminescent display apparatus (imaging device) of the 1st Example of this invention. It is explanatory drawing which showed the same heat dissipation structure. It is explanatory drawing which showed the heat dissipation structure of the other example same as the above. It is explanatory drawing which shows the double-sided light emission type organic electroluminescent display apparatus (imaging device) of the 2nd Example of this invention. It is explanatory drawing which shows the double-sided light emission type organic electroluminescent display apparatus (imaging device) of the 3rd Example of this invention. It is explanatory drawing which showed the structure of the organic electroluminescent element. It is explanatory drawing which showed the structure of the organic electroluminescent element. It is explanatory drawing which showed the organic electroluminescent element of the bottom emission structure. It is explanatory drawing which showed the organic electroluminescent element of the top emission structure.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10; Double-sided emission type organic electroluminescent panel, 10A; Double-sided emission type organic electroluminescent panel, 11; Glass substrate, 12; Al wiring, 13; Transparent anode electrode, 14: Light emitting layer, 15; , 16; protective layer, 17; transparent seal, 20; reflection / heat dissipation structure, 20A; reflection / heat dissipation structure, 20a; reflection / heat dissipation structure, 21; metal, 22; metal, 23; metal, 24; , 24; Resin, 25; Resin, 26; Resin, 27; Hinge, 28; Cathode electrode emission, 29; Anode electrode emission, 29a; Reflected anode electrode emission, 30; Body, 30A; Camera body, 31; 32: A housing that also serves as heat dissipation.

Claims (16)

  Reflective / heat dissipation with a reflective member and a heat dissipation function on one side of a panel composed of a double-sided light-emitting organic electroluminescence device, which is composed of a light-emitting layer laminated between a light-transmitting cathode electrode and a transparent anode electrode A double-sided organic electroluminescence display device comprising a structure cover attached.   The double-sided organic electroluminescence display device according to claim 1, wherein the cover is attached to the panel by a hinge.   The double-sided organic electroluminescence display device according to claim 1, wherein the cover shields light emitted from the anode electrode side of the panel.   The double-sided light emitting organic electroluminescence display device according to claim 1, wherein the cover is detachable from the panel.   A double-sided light emitting organic electroluminescence device comprising a light emitting layer laminated between a light transmitting cathode electrode and a transparent anode electrode on a reflective / heat radiating structure which is a reflective member incorporated in the main body and has a heat radiating function A double-sided light emitting organic electroluminescence display device, characterized in that it is attached so as to shield one side of a panel comprising:   The double-sided light emitting organic electroluminescence display device according to claim 5, wherein the panel is attached to the reflection / heat dissipation structure by a hinge.   6. The double-sided light emitting organic electroluminescence display device according to claim 5, wherein the reflective / heat radiating structure shields light emitted from the anode electrode side of the panel.   6. The double-sided light emitting organic electroluminescence display device according to claim 5, wherein the reflection / heat radiation structure is detachable from the panel. An imaging apparatus provided with a display means,
The display means is a reflective member and has a heat dissipation function on one side of a panel composed of a double-sided light emitting organic electroluminescence element, in which a light emitting layer is laminated between a light transmissive cathode electrode and a transparent anode electrode. An imaging apparatus comprising a reflection / heat dissipation structure cover provided.   The image pickup apparatus according to claim 9, wherein the cover is attached to the panel by a hinge.   The imaging apparatus according to claim 9, wherein the cover shields light emitted from an anode electrode side of the panel.   The imaging apparatus according to claim 9, wherein the cover is detachable from the panel. An imaging apparatus provided with a display means,
The display means is a double-sided light emitting device in which a light emitting layer is laminated between a light transmitting cathode electrode and a transparent anode electrode on a reflective / heat radiating structure having a heat radiating function and a reflecting member incorporated in a main body. An image pickup apparatus, which is attached so as to shield one side of a panel made of a type organic electroluminescence element.   The image pickup apparatus according to claim 13, wherein the panel is attached to the reflection / heat dissipation structure by a hinge.   The imaging apparatus according to claim 13, wherein the reflection / heat radiation structure shields light emitted from an anode electrode side of the panel.   The imaging apparatus according to claim 13, wherein the reflection / heat dissipation structure is detachable from the panel.

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