JP2006140079A - Electro-optical device and electronic apparatus equipped with this - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce temperature variations of an organic EL element generated by radiant heat. <P>SOLUTION: The drying agent 11 is pasted in an overlapping region 2 overlapping with a display region of an transparent substrate 1 as viewed from the transparent substrate 1 side out of the opposed face 25 of a sealing plate 20. The drying agent 11 has a size smaller than that of the display region of the transparent substrate 1, and is located at a part of the region of the overlapping region 22. The coating film 23 formed on the surface of the drying agent 11 has a color close to the opposed face 25 and reflects uniformly the infrared rays emitted from the organic EL element 72 toward the opposed face 25 and the drying agent 23. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a technical field of an electro-optical device such as an organic EL display device including a light-emitting element such as an organic EL (Electro-luminescence) element, and an electronic apparatus including the electro-optical device.

  It is generally known that an organic EL (Electro-luminescence) element which is a kind of thin film light emitting element is easily deteriorated by moisture. In order to solve this problem, for example, an organic EL display device including an organic EL element often includes a sealing structure for preventing moisture from entering. Such a sealing structure not only simply seals the organic EL element, but also disposes a desiccant inside the sealing plate and removes moisture that has entered inside the sealing plate with the desiccant. It has been broken. For example, Patent Document 1 discloses an example of a desiccant disposed in a sealing portion.

JP 2000-3783 A

  The desiccant provided in this type of organic EL display device is often affixed to a part of the inner surface of the sealing plate so as not to give stress stress to the organic EL element. Will face two surfaces, the inner surface of the sealing plate and the surface of the desiccant. These two surfaces usually have different reflectances with respect to infrared rays emitted from the organic EL element as the organic EL element generates heat. Therefore, electromagnetic waves with radiant heat such as infrared rays and far infrared rays are reflected at different ratios on the inner side of the sealing plate and on the surface of the desiccant, and different amounts of each are applied to the plurality of organic EL elements arranged in the image display region. Infrared rays or the like will arrive. As a result, in-plane variation or in-plane distribution of temperature occurs. When temperature variations occur in this way, the plurality of organic EL elements exhibit different light emission efficiency characteristics, resulting in in-plane luminance variations. This is because an organic EL element is an element that is susceptible to fluctuations in element characteristics due to temperature, and changes in current-voltage characteristics or current emission characteristics due to temperature fluctuations.

  As described above, the temperature variation in the organic EL element due to the radiant heat of the organic EL element causes a technical problem that the element characteristics of the organic EL element and the display capability of the organic EL display device are greatly reduced. is there.

  Accordingly, the present invention has been made in view of the above-described problems and the like, and an object thereof is an electro-optical device capable of preventing temperature variation from occurring in a light emitting element such as an organic EL element, and the like. Is to provide electronic equipment.

  In order to solve the above problems, an electro-optical device according to a first aspect of the present invention includes a transparent substrate, a single or a plurality of light-emitting elements formed on the transparent substrate, and the light emission on the upper side of the transparent substrate. A flat plate-shaped sealing portion that is disposed so as to face the device and seals the light emitting device with a space between the transparent substrate, and the sealing portion on the side facing the light emitting device, A desiccant disposed in a part of the region overlapping the display region of the transparent substrate when viewed from the direction orthogonal to the substrate surface of the transparent substrate, and the desiccant applied to the facing surface of the desiccant facing the light emitting element. And a colored layer having a color closer to the color of the sealing portion on the side facing the light emitting element than the color of the facing surface.

  According to the electro-optical device according to the present invention, an infrared ray, a far-infrared ray, and the like that are respectively reflected by the colored layer applied to the facing surface facing the light emitting element in the desiccant and the side facing the light emitting element in the sealing portion. It is possible to make the reflectance with respect to electromagnetic waves uniform. That is, the radiant heat generated in the light emitting element can be aligned with the desiccant and the sealing portion facing the light emitting element with a space therebetween, and the in-plane variation or in-plane distribution of temperature in the transparent substrate surface can be reduced. . Typically, radiant heat due to reflection is uniformly applied to a plurality of light emitting elements arranged in a matrix on the surface of a transparent substrate, regardless of the position of the light emitting elements, for example, near the center or the periphery. Can do. In addition, when the size of each light emitting element is relatively large, the in-plane distribution of temperature in each light emitting element can be suppressed. Therefore, light having a desired luminance can be emitted from the light-emitting element, and a desired image can be displayed in the display area. More specifically, for example, when a plurality of light emitting elements that emit red (R), green (G), and blue (B) light are arranged in the display area, Accordingly, light having a predetermined luminance of red, green, and blue can be emitted, and the image quality of an image displayed can be improved by a combination of these lights.

  Here, the “flat plate-shaped sealing portion” according to the present invention is a plate shape whose both surfaces are flat surfaces, and a surface facing the light emitting element is a flat surface, and a peripheral portion protrudes from the flat surface. Including what you have. More specifically, for example, when the light emitting element is sealed by adhering the peripheral region of the plate-like member whose both surfaces are flat surfaces and the transparent substrate with a seal portion, or protruding from the flat surface facing the light emitting element. The case where the light emitting element is sealed by bonding the peripheral edge portion and the transparent substrate is included.

  In addition, the “color closer to the color facing the light emitting element in the sealing portion than the color of the facing surface” according to the present invention refers to, for example, infrared rays emitted from the light emitting elements according to temperature, It means a color in which the reflectance on the side facing the light emitting element in the colored layer and the sealing portion approaches as the energy density of electromagnetic waves such as infrared rays approaches the peak value. That is, it means that colors that are within and outside the visible region as the frequency band of electromagnetic waves are relatively close. The “display area” according to the present invention refers to the entire image display area in which an image is displayed by a plurality of light emitting elements or each light emitting element when a plurality of light emitting elements are formed on a transparent substrate such as a glass substrate. It means a light emission region where light is emitted from the element. The “overlapping region” according to the present invention is a region in which infrared rays or the like emitted from the light emitting element are directly or indirectly reflected, and radiant heat caused by the reflected infrared rays or the like can reach the light emitting element directly. Means.

  In one aspect of the electro-optical device according to the first aspect of the present invention, the color of the sealing portion facing the light emitting element and the color of the colored layer are the same color. Also good.

  According to this aspect, the radiant heat generated in the light emitting element can be uniformly reflected by the side facing the light emitting element in the sealing portion and the colored layer, and the temperature variation of the light emitting element due to the reflected radiant heat can be reduced. Can be reduced. Here, the “same color” according to the present invention is not only the same color as the letter, but also the same color to the extent that the effect of making the radiant heat uniform or close to uniform can be achieved. That is enough, that is, it means substantially the same color.

  In order to solve the above problems, an electro-optical device according to a second aspect of the present invention includes a transparent substrate, a single or a plurality of light emitting elements formed on the transparent substrate, and the light emission on the upper side of the transparent substrate. A flat plate-shaped sealing portion that is disposed so as to face the device and seals the light emitting device with a space between the transparent substrate, and the sealing portion on the side facing the light emitting device, An electro-optical device comprising a desiccant disposed in a partial region in a region overlapping with a display region of the transparent substrate when viewed from a direction orthogonal to the substrate surface of the transparent substrate, A colored layer having a color closer to the color of the desiccant than the surface of the sealing portion facing the light emitting element is provided on the surface facing the light emitting element.

  According to the electro-optical device according to the present invention, the temperature variation of the light emitting elements can be reduced as in the electro-optical device according to the first aspect of the present invention described above, and the image quality of the image displayed in the display area can be reduced. It is possible to increase. In the first invention of the present invention, the colored layer is provided on the surface of the desiccant so as to make the reflection with respect to the radiant heat radiated from the light emitting element uniform, but the second invention provides a colored layer on the surface of the sealing portion. To make the reflection of radiant heat uniform.

  In another aspect of the electro-optical device according to the second aspect of the present invention, the color of the desiccant and the colored layer provided on the surface of the sealing portion facing the light emitting element are mutually the same. The color may be Here, the “same color” is not only literally the same color as in the electro-optical device of the present invention described above, but also to the extent that the effect of making the radiant heat uniform or close to uniform can be achieved. The same color is sufficient, that is, it means substantially the same color.

  In order to solve the above problems, an electro-optical device according to a third aspect of the present invention includes a transparent substrate, a single or a plurality of light emitting elements formed on the transparent substrate, and the light emission above the transparent substrate. A flat plate-shaped sealing portion that is disposed so as to face the device and seals the light emitting device with a space between the transparent substrate, and the sealing portion on the side facing the light emitting device, An electro-optical device comprising a desiccant disposed in a partial region in a region overlapping with a display region of the transparent substrate when viewed from a direction orthogonal to the substrate surface of the transparent substrate, A colored layer is provided on the surface facing the light emitting element and the surface of the desiccant facing the light emitting element.

  According to the electro-optical device according to the present invention, the temperature variation of the light-emitting elements can be reduced as in the above-described electro-optical device according to the first or second aspect of the present invention, and an image displayed in the display area. It is possible to improve the image quality. In the first invention of the present invention, the colored layer is provided on the surface of the desiccant, and in the second invention, the colored layer is arranged on the surface of the sealing portion to make the reflection of the radiant heat uniform. In the third invention, By providing a colored layer that covers both the surface of the desiccant and the surface of the sealing portion, the reflection of radiant heat is made uniform, and temperature variations in the display region are reduced.

  In order to solve the above problems, an electro-optical device according to a fourth aspect of the present invention includes a transparent substrate, a single or a plurality of light emitting elements formed on the transparent substrate, and the light emission above the light emitting elements. A flat plate-shaped sealing portion that is disposed so as to face the device and seals the light emitting device with a space between the transparent substrate, and the sealing portion on the side facing the light emitting device, It is disposed in a part of the region overlapping the display region of the transparent substrate when viewed from the direction orthogonal to the substrate surface of the transparent substrate, and has the same color as the color facing the light emitting element in the sealing portion And a desiccant that is a color.

  According to the electro-optical device according to the present invention, it is possible to reduce the temperature variation of the light emitting elements as in the electro-optical devices according to the first to third aspects of the present invention described above, and an image displayed in the display area. It is possible to improve the image quality. In the first and second inventions of the present invention, the difference in reflectance with respect to radiant heat between the desiccant surface and the sealing portion surface is made uniform by providing a colored layer. On the other hand, in the fourth invention of the present invention, the colors of the sealing part and the desiccant themselves are selected to be the same, and the reflection of radiant heat is made uniform.

  In one aspect of the electro-optical device according to the first to fourth aspects of the present invention, the same color may be black.

  According to this aspect, the side facing the light emitting element and the colored layer in the sealing portion, or the side facing the light emitting element and the desiccant in the sealing portion efficiently emits infrared rays or the like emitted from the light emitting element. For example, the absorbed energy such as infrared rays can be radiated to the outside of the apparatus through the sealing portion. Therefore, the temperature rise of the sealed light emitting element can be suppressed, and deterioration of element characteristics due to the light emitting element being exposed to a high temperature can be reduced.

  In another aspect of the first to fourth electro-optical devices of the present invention, the sealing portion may include a metal.

  According to this aspect, since the thermal conductivity of the sealing portion configured to include metal is larger than the thermal conductivity of the glass plate, heat can be efficiently radiated to the outside of the apparatus through the sealing portion. Is possible. Therefore, for example, the temperature rise of the entire apparatus during driving can be suppressed, and the lifetime in which the light emitting element can operate normally can be extended. Here, “including metal” according to the present invention includes both the case where the sealing portion is made of only metal or the case where a part of the sealing portion is made of metal. That is, for example, it means that any configuration may be used as long as the thermal conductivity of the sealing portion containing metal is higher than that of the sealing portion formed only of a glass plate.

  In order to solve the above problems, an electro-optical device according to a fifth aspect of the present invention includes a transparent substrate, a single or a plurality of light emitting elements formed on the transparent substrate, and the light emission above the light emitting elements. A flat sealing portion that is disposed so as to face the device and seals the light emitting device between the transparent substrate and includes colored glass, and the light emitting device of the sealing portion. And a desiccant disposed in a part of the region that overlaps the display region of the transparent substrate when viewed from a direction orthogonal to the substrate surface of the transparent substrate.

  According to the electro-optical device according to the present invention, it is possible to approach the reflectance with respect to electromagnetic waves such as infrared rays by the desiccant and the sealing portion, and the infrared rays reflected by the desiccant and the sealing portion respectively vary. The resulting temperature variation of the light emitting element can be reduced. Here, the colored glass means a material having a low transmittance with respect to an electromagnetic wave that bears radiant heat such as far infrared rays compared to a case where it is not colored, and more specifically, has a transmittance with respect to infrared rays compared with a transparent substrate. Means low. Such a sealing portion can reduce infrared rays and the like that are transmitted to the outside of the device, and can also reduce irradiation of the light-emitting element with infrared rays and the like reflected outside the device. Therefore, according to the sealing part containing colored glass, it is possible to reduce variations in infrared rays and the like reflected toward the light emitting element, and it is also possible to reduce infrared rays and the like reflected toward the light emitting element. is there. Accordingly, it is possible to reduce the temperature variation of the light emitting elements and to suppress the temperature rise of the light emitting elements. Thereby, the quality of the image displayed on the display area can be improved, and the lifetime of the light emitting element can be extended.

  In another aspect of the fifth electro-optical device of the present invention, the color of the desiccant and the color of the sealing portion may be the same color.

  According to this aspect, it is possible to make the reflectance of the radiant heat by the desiccant and the sealing portion uniform as in the above-described electro-optical device according to the present invention, and temperature variations of the light emitting elements can be reduced. Here, the “same color” has the same meaning as the “same color” described in the above embodiments.

  In another aspect of the electro-optical device according to any one of the first to fifth aspects of the present invention, the desiccant has a flat plate shape, and the sealing portion is open to the facing surface side. A groove portion in which the desiccant is at least partially embedded may be provided in the region of the portion.

  According to this aspect, for example, heat transfer by radiation through the space interposed between the sealing portion and the transparent substrate and heat transfer by heat conduction such as air filled in the space are uniformly performed. The temperature variation of the light emitting element can be reduced. More specifically, for example, when the surface of the desiccant embedded in the groove and the opposing surface are flush with each other, the width of the space between the sealing part containing the desiccant and the transparent substrate is the device. It becomes uniform as a whole, and uniform heat transfer is performed in this space, so that temperature variations of the light emitting elements can be more effectively reduced.

  In one aspect of the electro-optical device according to the first to fifth aspects of the present invention, the light-emitting element may be an organic EL light-emitting element.

  According to this aspect, it is possible to suppress the in-plane distribution of the temperature in the image display region due to the difference between the reflection of the radiant heat by the desiccant and the reflection of the radiant heat by the sealing portion. Therefore, fluctuations in luminance generated in the organic EL light emitting element can be suppressed. Therefore, for example, light having a desired luminance corresponding to the injected current can be emitted from the organic EL light emitting element.

  In order to solve the above problems, an electronic apparatus according to the present invention includes any one of the above-described electro-optical devices of the present invention.

  According to the electronic apparatus according to the present invention, since the electro-optical device according to the present invention described above is provided, a projection display device, a mobile phone, an electronic notebook, a word processor, and a viewfinder type capable of high-quality display. Alternatively, various electronic devices such as a monitor direct-view type video tape recorder, a workstation, a videophone, a POS terminal, a touch panel, and an image forming apparatus such as a printer, a copy, and a facsimile using an electro-optical device as an exposure head can be realized. . Further, as an electronic apparatus according to the present invention, for example, an electron emission device (Field Emission Display and Conduction Electron-Emitter Display), an inorganic EL display device, and the like can be realized.

  Such an operation and other advantages of the present invention will become apparent from the embodiments described below.

  Hereinafter, embodiments of an electro-optical device and an electronic apparatus according to the present invention will be described in detail with reference to the drawings. In the present embodiment, an example in which the electro-optical device according to the invention is applied to an organic EL display device will be described.

(First embodiment)
A first embodiment will be described with reference to FIGS.

  First, the electrical configuration of the first embodiment will be described with reference to FIG. FIG. 1 is a block diagram showing the overall configuration of an organic EL display device 10 which is an example of an “electro-optical device” according to the present invention. The organic EL display device 10 is a display device that is driven by an active matrix driving method with a built-in driving circuit, and includes an organic EL element in each pixel portion.

  In FIG. 1, an image display area 110 in the organic EL display device 10 is provided with data lines 114 and scanning lines 112 wired vertically and horizontally, and pixel units 70 corresponding to the intersections thereof are arranged in a matrix. Is done. Further, the image display area 110 is provided with power supply lines 117 corresponding to the pixel portions 70 arranged for the respective data lines 114.

  A scanning line driving circuit 130 and a data line driving circuit 150 are provided in the peripheral area located around the image display area 110. The scanning line driving circuit 130 sequentially supplies scanning signals to the plurality of scanning lines 112. Further, the data line driving circuit 150 supplies an image signal to the data line 114 wired in the image display area 110. Note that the operation of the scanning line driving circuit 130 and the operation of the data line driving circuit 150 are synchronized with each other by a synchronization signal 160 supplied from an external circuit. The power supply line 117 is supplied with pixel driving power from an external circuit. Focusing on one pixel portion 70 in FIG. 1, the pixel portion 70 is provided with an organic EL element 72 and, for example, a switching transistor 76 and a driving transistor 74 configured using TFTs, and a storage capacitor. 78 is provided. The scanning line 112 is electrically connected to the gate electrode of the switching transistor 76, the data line 114 is electrically connected to the source electrode of the switching transistor 76, and the drive is connected to the drain electrode of the switching transistor 76. The gate electrode of the transistor 74 is electrically connected. The power supply line 117 is electrically connected to the drain electrode of the driving transistor 74, and the anode of the organic EL element 72 is electrically connected to the source electrode of the driving transistor 74. In addition to the configuration of the pixel circuit illustrated in FIG. 1, various types of pixel circuits such as a current programming type pixel circuit, a voltage programming type pixel circuit, a voltage comparison type pixel circuit, a subframe type pixel circuit, and the like. Can be adopted.

  Next, the sealing structure and the structure of the pixel portion in the first embodiment will be described in detail with reference to FIGS. 2 is a perspective view of the organic EL display device 10, FIG. 3 is a cross-sectional view taken along the line AA 'in FIG. 2, and FIG. 4 is a plan view of the organic EL display device 10.

  2, 3, and 4, the organic EL display device 10 is disposed on a flat substrate 1 such as a glass substrate and a surface of the transparent substrate 1 on the side where the pixel unit 70 is formed. The sealing plate 20, the desiccant 11 disposed on the opposing surface 25 of the sealing plate 20 on the side facing the pixel portion 70, the seal portion 21 that bonds the sealing plate 20 and the transparent substrate 1, The paint film 23 is an example of the “colored layer” according to the invention.

  The organic EL element 72 included in the pixel unit 70 includes an organic EL layer 50 including a light emitting layer, a cathode 49, and an anode 34, and emits display light for displaying an image on the lower side in the drawing. This is a bottom emission type organic EL element. The organic EL element 72 includes an anode 34 formed on the first bank layer 46 of the stacked portion 52 including the gate insulating film 2, the interlayer insulating film 41, the protective layer 45, and the first bank layer 46 that are sequentially formed on the transparent substrate 1. Is formed to be embedded. The organic EL layer 50 includes a plurality of organic layers including a light emitting layer, and these organic layers are surrounded by a second bank layer 47 that functions as an element isolation layer for separating the plurality of organic EL layers 50 from each other. It is formed by applying an organic material to the space. The organic EL layer 50 is formed by sequentially applying ink for forming each organic layer to a space surrounded by the second bank layer 47 by, for example, an ink jet method which is an example of a coating method. The cathode 49 is a common electrode for each organic EL element 72 formed on the transparent substrate 1, and has a cross section across the upper surface of the second bank layer 47 that separates the organic EL layers 50 from the upper surface of the organic EL layer 50. It is formed on almost the entire surface. The source electrode 42 of the driving transistor 74 is electrically connected to the anode 34 and supplies a driving current supplied from the power supply line 117 via the drain electrode 74 d to the organic EL element 72.

  The pixel unit 70 is formed in a matrix on the upper side of the transparent substrate 1 in FIG. 3, and an image is displayed by light emitted from the organic EL element 72 included in each pixel unit 70 to the lower side in the drawing.

  The area | region in which the pixel part 70 was formed in the transparent substrate 1 turns into a display area which displays an image with the light radiate | emitted from each organic EL element. That is, an image is displayed by light transmitted through the transparent substrate 1 from the display area including the pixel portion 70 toward the lower side in the figure.

The desiccant 11 has a flat plate shape, and is affixed to the facing surface 25 on the side facing the pixel portion 70 out of both surfaces of the flat sealing plate 20. The desiccant 11 removes moisture from the space sealed by the sealing plate 20, the seal portion 21, and the laminated portion 52 formed on the transparent substrate 1, and suppresses the organic EL element 72 from being deteriorated by moisture. To do. The desiccant 11 has a size smaller than the overlapping area 22 that overlaps the display area of the facing surface 25. Examples of the desiccant 11 include barium oxide (BaO), calcium carbonate (CaCO ₃ ), zeolite, silica gel, A fine powder such as alumina adhered to a supporting film such as paper or Teflon (registered trademark) can be used.

  The sealing plate 20 and the seal portion 21 constitute an example of the “sealing portion” according to the present invention, and moisture is prevented from entering the inside of the device from the outside of the organic EL display device 10. A certain space is interposed between the facing surface 25 of the sealing plate 20 and the organic EL element 72. Such a sealing structure is called “can sealing” by the inventors of the present application, and a similar sealing structure in this specification will be referred to as “can sealing” for convenience.

  The desiccant 11 is affixed in the overlapping region 22 that overlaps the display region of the transparent substrate 1 when viewed from the transparent substrate 1 side of the facing surface 25 of the sealing plate 20. The desiccant 11 has a size smaller than that of the display area of the transparent substrate 1 and is located in a part of the overlapping area 22. In the present embodiment, one desiccant 11 is disposed in a part of the overlapping region 22, but a plurality of desiccants 11 may be disposed.

  The coating film 23 is formed on the surface 24 facing the pixel portion 70 of the desiccant 11. The color of the coating film 23 is closer to the color of the facing surface 25 of the sealing plate 20 than the color of the desiccant 11, and the reflectance of the coating film 23 with respect to electromagnetic waves related to thermal radiation such as infrared rays and far infrared rays The reflectance of the facing surface 25 included in the overlapping region 22 with respect to infrared rays or the like is set to a close value. Therefore, infrared rays or the like (so-called heat radiation) radiated from the organic EL element 72 included in the pixel unit 70 to the upper side in the drawing due to heat generation are overlapped by the coating film 23 and the facing surface 25 included in the overlap region 22. 22 is uniformly reflected by the pixel unit 70 in the area 22. Here, “uniform” means that infrared rays and the like are uniformly reflected toward the pixel unit 70 as compared with the case where the coating film 23 is not formed on the surface 24 which is the surface of the desiccant 11 facing the pixel unit 70. This includes the case where the color of the coating film 23 and the color of the facing surface 25 are not completely the same color.

  In each of the organic EL elements 72 included in the pixel unit 70, infrared rays and the like reflected by the surface of the facing surface 25 and the coating film 23 among the infrared rays emitted from the organic EL elements 72 to the upper side in the drawing are shown. Uniform irradiation from above. Therefore, infrared rays and the like are uniformly irradiated to each organic EL element 72, and the temperature variation of the organic EL element 72 is reduced throughout the apparatus. Thereby, it can suppress that the light which generate | occur | produces in the organic EL element 72 shift | deviates from desired brightness | luminance. More specifically, according to the design of the organic EL element 72, each organic EL element 72 can generate light having a luminance that should be originally generated by each organic EL element 72. For example, when the organic EL display device 10 includes organic EL elements that generate red (R), green (G), and blue (B) light in the pixel unit 70, the light having the wavelengths of the respective colors is Light is emitted from the organic EL element corresponding to the color with a predetermined luminance, and the organic EL display device 10 can display a high-quality image in which the image quality is not deteriorated due to the color shift.

  In the above, in order to eliminate the difference between the reflection of the radiant heat on the surface 24 of the desiccant 11 and the reflection of the radiant heat on the facing surface 25 of the sealing plate 20, the coating film 23 is applied to the surface 24 of the desiccant 11 to radiate heat. The reflection of was uniform. Conversely, a coating film is not provided on the surface 24 of the desiccant 11, and a coating film having a color closer to the surface 24 of the desiccant 11 than the facing surface 25 of the sealing plate 20 is formed on the facing surface 25 of the sealing plate 20. By providing, the reflection of radiant heat may be made uniform.

  It is preferable that the color of the coating film 23 and the color of the facing surface 20a are literally the same color in order to reflect infrared rays and the like uniformly. For example, the facing surface 25 may be colored black and a black coating material may be applied to the surface of the desiccant 11. Black has a lower reflectance with respect to infrared rays or the like than other colors, and therefore, the amount of infrared rays reflected toward the pixel unit 70 among the infrared rays emitted from the organic EL element 72 toward the upper side in the figure is reduced. In addition to suppressing the temperature variation of the organic EL element 72, the temperature rise of the organic EL element 72 can also be suppressed.

  The facing surface 25 and the coating film 23 not only reflect the infrared rays emitted from the organic EL element 72, that is, the radiant heat generated according to the temperature of the organic EL element 72, but can also absorb a part of this radiant heat. it can. The sealing plate 20 is a metal plate and has a higher thermal conductivity than the glass plate. Therefore, the sealing plate 20 can quickly dissipate the radiant heat absorbed through the facing surface 25 and the coating film 23 to the outside of the apparatus. In particular, when the facing surface 25 and the coating film 23 are colored in black, the radiant heat of the organic EL element 72 can be efficiently absorbed, and the sealing plate 20 radiates the absorbed radiant heat to the outside of the apparatus. As a result, it is possible to suppress the temperature rise of the entire apparatus. In particular, since the organic EL element 72 is an element whose life is likely to decrease when exposed to a high temperature, suppressing the temperature rise in the organic EL display device 10 is also effective in extending the life of the entire device. It is. Of course, the sealing plate 20 is not limited to the case of being a metal plate, and may include a metal, and may have a higher thermal conductivity than the case of not including a metal. .

  The coating film 23 is not limited to being formed only on the surface of the desiccant 11 on the side facing the pixel portion 70, and may be formed on the entire surface of the facing surface 25 and the desiccant 11.

  In such a case, even if the color of the sealing plate 20 and the color of the desiccant 11 are different, the surfaces of the sealing plate 20 and the desiccant 11 on the side facing the pixel portion 70 can be the same color. Regardless of the color of the surface 25, the side of the sealing plate 20 and the desiccant 11 facing the pixel portion 70 can be colored in a required color. More specifically, for example, when the colors of the facing surface 25 and the desiccant 11 are different and the color of the facing surface 25 is not black, a black coating film is formed on the entire surface of the facing surface 25 and the desiccant 11. As a result, the entire surface of the sealing plate 20 and the desiccant 11 facing the pixel portion 70 can be colored black.

  Here, by making the opposing surface 25 and the coating film 23 black, the organic EL element 72 receives radiant heat corresponding to the temperatures of the sealing plate 20 and the coating film 23 from the opposing surface 25 and the coating film 23. . However, when the organic EL element 72 emits light, the temperature of the sealing plate 20 is much lower than the temperature of the organic EL element 72. For example, when the organic EL display device 10 is driven at room temperature, the temperature of the sealing plate 20 is equivalent to room temperature, whereas the temperature of the organic EL element 72 may reach 90 to 100 ° C. is there. In such a case, the radiant heat due to the temperature of the sealing plate 20 is smaller than the radiant heat due to the temperature of the organic EL element 72, and the color of the facing surface 25 and the coating film 23 is made black, so that the organic EL element 72. The temperature of the glass hardly rises. Therefore, the heat dissipation of the device can be enhanced by using the radiant heat from the organic EL element 72, and the life of the organic EL element 72 can be extended.

  Thus, according to the present embodiment, it is possible to reduce the non-uniform reflection of infrared rays or the like emitted from the organic EL element 72 by the opposing surface 25 and the surface 24 of the desiccant 11, and an organic EL display The temperature variation of the organic EL element 72 can be reduced in the entire apparatus 10. Thereby, it can suppress that the brightness | luminance of the light which generate | occur | produces in each organic EL element 72 shifts from original brightness | luminance, and a high quality image is displayed.

  In the following embodiments, portions common to the organic EL display device 10 according to the first embodiment will be described with the same reference numerals. In each of the following embodiments, the organic EL element is sealed by can sealing, thereby suppressing the characteristic deterioration of the organic EL element due to moisture.

(Second Embodiment)
Next, a second embodiment will be described with reference to FIG. The second embodiment is different from the first embodiment in the sealing structure, and the other configurations are the same. FIG. 5 is a cross-sectional view showing the configuration of the organic EL display device 40 according to this embodiment. In FIG. 5, the same components as those in the first embodiment shown in FIGS. 1 to 4 are denoted by the same reference numerals, and description thereof will be omitted as appropriate.

  In FIG. 5, the organic EL display device 40 is configured to include a sealing plate 20 a and a desiccant 11 a attached to a facing surface 25 a that is a surface facing the pixel portion 70 of the sealing plate 20 a. Yes.

  The sealing plate 20 a includes a convex portion 26 at the peripheral portion thereof, and seals the organic EL element 72 by adhering the convex portion 26 to the laminated portion 52 on the transparent substrate 1. The sealing plate 20 a is a glass plate, for example, and has a thermal expansion coefficient close to that of the transparent substrate 1. There is almost no difference in changes in the dimensions of the sealing plate 20a and the transparent substrate 1 due to temperature changes. Therefore, distortion generated between the sealing plate 20a and the transparent substrate 1 due to thermal expansion or contraction can be reduced, and the structural reliability of the organic EL display device 40 can be enhanced.

  The color of the surface 24a of the desiccant 11a on the side facing the pixel unit 70 is the same as or similar to the color of the facing surface 25a of the overlapping region 22 that overlaps the display region of the transparent substrate 1 in the facing surface 25a. The reflectivity for infrared rays and the like on the surfaces of 24a and 25a is set to a close value. More specifically, the desiccant 11a is previously colored in the same or similar color as the color of the opposing surface 25a. Conversely, the facing surface 25 a may be colored in the same or similar color as the color of the desiccant 11. Preferably, the opposing surface 25a and the desiccant 11 are the same color, and the reflectance with respect to infrared rays or the like is preferably the same. Therefore, similarly to the first embodiment, the temperature variation of the organic EL element 72 due to the radiant heat of the organic EL element 72 can be reduced in the entire apparatus, and the organic EL display device 40 displays a high-quality image without color shift. be able to.

(Third embodiment)
Next, a third embodiment will be described with reference to FIG. The third embodiment is different from the first embodiment in the sealing structure, and the other configurations are the same. FIG. 6 is a cross-sectional view showing the configuration of the organic EL display device 60 according to this embodiment. In FIG. 6, the same components as those in the first embodiment shown in FIGS. 1 to 4 are denoted by the same reference numerals, and description thereof will be omitted as appropriate.

  In FIG. 6, the organic EL display device 60 includes a sealing plate 20 b and a desiccant 11 b disposed on the facing surface 25 b on the side facing the pixel portion 70 of the sealing plate 20 b.

  The sealing plate 20b is a colored glass obtained by coloring transparent glass, and is colored in a color close to the color of the desiccant 11b. Therefore, the reflectance with respect to infrared rays or the like of the surface 24b of the desiccant 11b on the side facing the pixel portion 70 and the facing surface 25b on the side of the sealing plate 20b facing the pixel portion 70 is transparent glass as a sealing plate. It is set to a value close to the case of using. Therefore, the radiant heat of the organic EL element 72 is uniformly reflected by the surface 24b of the desiccant 11b and the opposing surface 25b. Thereby, the temperature variation of the organic EL element 72 can be reduced in the organic EL display device 60 as a whole. In order to absorb the radiant heat of the organic EL element 72, it is more preferable that the color of the desiccant 11b and the sealing plate 20b is darker than transparent glass. Here, “dark color” means, for example, a color that is closer to black and has a higher absorption rate of infrared rays or the like than the transparent color of transparent glass. That is, by setting the color of the desiccant 11b and the facing surface 25b to be darker than that of the transparent glass, the absorbed radiant heat can be efficiently transferred to the outside of the apparatus through the sealing plate 20b while reducing the reflectance of infrared rays and the like. It can also dissipate heat.

  Here, as an advantage of using the sealing plate 20b colored in a color close to the color of the desiccant 11b, infrared rays or the like that are transmitted through the sealing plate 20b and reflected outside the organic EL display device 60 are again sealed. The point which can suppress that the temperature of these organic EL elements 72 can be suppressed by transmitting 20b and irradiating to the organic EL elements 72 is mentioned. More specifically, when a transparent glass plate is used as the sealing plate 20b, infrared rays or the like reflected by other objects outside the apparatus after passing through the transparent glass plate pass through the transparent glass plate again. To the organic EL element sealed in the apparatus. Such infrared rays are reflected non-uniformly outside the apparatus, which is one of the causes of temperature variations in the organic EL element 72. On the other hand, according to the sealing plate 20b which is a colored glass plate, infrared rays or the like emitted from the organic EL element 72 are less likely to pass through the sealing plate 20 as compared to the transparent glass plate, and the inside of the device again from the outside of the device. It is possible to reduce the amount of infrared rays or the like that are incident on the screen. In addition, since the reflectance of the desiccant 11b and the opposed surface 25b with respect to the infrared rays and the like is close, it is possible to suppress the infrared rays and the like from being unevenly irradiated to the organic EL elements over the entire apparatus, and to radiant heat. It is possible to reduce the resulting temperature variation of the organic EL element. Thereby, it can suppress that the element characteristic of the organic EL element 72 varies over the whole apparatus, and the display characteristic of the organic EL display apparatus 60 can be improved.

(Fourth embodiment)
Next, a fourth embodiment will be described with reference to FIG. The fourth embodiment is different from the first embodiment in the sealing structure, and the other configurations are the same. FIG. 7 is a cross-sectional view showing the configuration of the organic EL display device 70 according to this embodiment. In FIG. 7, the same components as those in the first embodiment shown in FIGS. 1 to 4 are denoted by the same reference numerals, and description thereof will be omitted as appropriate.

  In FIG. 7, the organic EL display device 70 includes a groove portion 27 formed on the facing surface 25 c of the sealing plate 20 c that is a colored glass plate, and a desiccant 11 c disposed so as to be embedded in the groove portion 27. This is different from the organic EL display device 60 according to the third embodiment.

  The groove portion 27 is formed to open downward in the figure in a region within the overlapping region 22 that overlaps the display region of the transparent substrate, on the opposite surface of the sealing plate 20c that faces the pixel portion 70. ing.

  The flat desiccant 11 c is arranged so that at least a part thereof is embedded in the groove 27. More specifically, the desiccant 11c is embedded in the groove 27 so that the dimension protruding downward in the figure with respect to the opposing surface 25c is smaller than when directly attached to the opposing surface 25c. ing. According to the desiccant 11c arranged in this way, the uneven shape formed by the facing surface 25c and the surface 24c of the desiccant 11c is flatter than when the desiccant 11c is directly attached to the facing surface 25c. Can approach. That is, by reflecting the radiant heat of the organic EL element 72 with a flatter surface, the temperature variation of the organic EL element 72 due to the radiant heat can be reduced over the entire apparatus.

  In addition, it is possible to suppress heat transfer due to uneven heat radiation that occurs when the desiccant 11c is directly attached to the facing surface 25c. More specifically, when the desiccant 11c is directly attached to the facing surface 25c, the desiccant 11c is interposed between the sealing plate 25c and the pixel portion 70 along the horizontal direction in the drawing, that is, the in-plane direction of the facing surface 25c. The width of the space S to be dispersed varies, but by making the width of the space S along the vertical direction in the drawing uniform along the horizontal direction in the drawing, the width of the space S can be made uniform throughout the apparatus. . Accordingly, (i) heat transfer by heat radiation through the space S, or (ii) in addition to or instead of the direction along the substrate surface due to heat conduction through a gas such as air occupying the space S and the vertical direction. Thus, heat transfer is performed uniformly in both directions, and temperature variations of the organic EL element 72 can be reduced. Here, the “width of the space S” means the interval between the sealing plate 20 c and the pixel unit 70 along the vertical direction in the drawing, and the interval between the desiccant 11 c and the pixel unit 70. In an actual organic EL display device, the thickness of the desiccant may be about a half of the width of the space interposed between the sealing plate and the pixel portion, and protrudes from the opposing surface toward the pixel portion. The desiccant is one of the causes of uneven heat transfer in this space. Therefore, by making the width of the space S constant, heat can be uniformly transferred through the space S, and the temperature variation of the organic EL element 72 can be effectively reduced in the entire apparatus. Further, in order to more effectively reduce the temperature variation of the organic EL element 72, it is more preferable to bury the desiccant 11c in the groove 27 so that the surface 24c of the desiccant 11c is flush with the facing surface 25c. Of course.

  As described above, according to the organic EL display device 70 according to the present embodiment, similarly to the organic EL display devices according to the above-described embodiments, the reflection of infrared rays or the like emitted from the organic EL display device toward the sealing plate or the like. The rate can be made uniform, and the temperature variation of the organic EL element due to non-uniform reflection of infrared rays or the like can be reduced. Furthermore, it is possible to improve the non-uniformity of heat conduction caused by disposing the desiccant and to provide an organic EL display device with little variation in element characteristics.

  In addition, the sealing structure which seals the organic EL element of each embodiment mentioned above is applicable also when sealing another element. Therefore, in the sealing structure in which the elements are sealed with the sealing can, the radiant heat generated according to the temperature of each element is uniformly reflected by the sealing plate and the desiccant, so that the temperature variation of these elements can be reduced throughout the apparatus. It is also possible to provide various devices that can reduce the variation in element characteristics.

(Electronics)
Next, various electronic devices including the above-described organic EL display device will be described.

<A: Mobile computer>
An example in which an organic EL display device which is an example of the organic EL device described above is applied to a mobile personal computer will be described with reference to FIG. FIG. 8 is a perspective view showing the configuration of the computer 1200.

  In FIG. 8, a computer 1200 includes a main body 1204 including a keyboard 1202 and a display unit 1206 including a display unit 1005 configured using an organic EL display device (not shown). The display portion 1005 suppresses display unevenness due to uneven temperature rise in the display area, and can display a high-quality image. Further, by forming organic EL elements that emit light of three primary colors of red, green, and blue on a plurality of organic EL display substrates included in the display unit 1005, the display unit 1005 displays an image in full color display. It can be carried out.

<B: Mobile phone>
Further, an example in which the above-described organic EL display device is applied to a mobile phone will be described with reference to FIG. FIG. 9 is a perspective view showing the configuration of the mobile phone 1300.

  In FIG. 9, a mobile phone 1300 includes a display unit 1305 having an organic EL display device according to an embodiment of the present invention, together with a plurality of operation buttons 1302.

  The display unit 1305 suppresses display unevenness due to a non-uniform temperature increase in the display region, as in the above-described display unit 1005, and can display a high-quality image. In addition, the plurality of organic EL elements included in the display portion 1305 emit light of the three primary colors of red, green, and blue, so that the display portion 1305 can perform image display in full color display.

  The present invention is not limited to the above-described embodiments, and can be appropriately changed without departing from the spirit or idea of the invention that can be read from the claims and the entire specification. A device manufacturing method and method, and an electro-optical device and an electronic apparatus are also included in the technical scope of the present invention.

1 is a block diagram illustrating an overall configuration of an organic EL display device according to a first embodiment of the present invention. 1 is a perspective view of an organic EL display device according to a first embodiment. It is the sectional view on the AA 'line in FIG. 1 is a plan view of an organic EL display device according to a first embodiment. It is sectional drawing which shows the structure of the organic electroluminescence display which concerns on 2nd Embodiment. It is sectional drawing which shows the structure of the organic electroluminescence display which concerns on 3rd Embodiment. It is sectional drawing which shows the structure of the organic electroluminescence display which concerns on 4th Embodiment. It is a perspective view which shows an example of the electronic device which concerns on this invention. It is a perspective view which shows the other example of the electronic device which concerns on this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10, 40, 60, 70 ... Organic EL display device, 11, 11a, 11b, 11c ... Desiccant, 20, 20a, 20b, 20c ... Sealing plate, 23 ... Paint film, 27 ... Groove part, 72 ... Organic EL element

Claims (13)

A transparent substrate;
A single or a plurality of light emitting elements formed on the transparent substrate;
A flat sealing portion that is disposed on the upper side of the transparent substrate so as to face the light emitting element, and seals the light emitting element with a space between the transparent substrate;
A desiccant disposed in a part of the region overlapping the display region of the transparent substrate when viewed from the direction orthogonal to the substrate surface of the transparent substrate on the side of the sealing portion facing the light emitting element;
The desiccant is applied to the facing surface facing the light emitting element, and includes a colored layer having a color closer to the color of the sealing portion on the side facing the light emitting element than the color of the facing surface. An electro-optical device. 2. The electro-optical device according to claim 1, wherein the color of the sealing portion on the side facing the light emitting element and the color of the colored layer are the same color. A transparent substrate;
A single or a plurality of light emitting elements formed on the transparent substrate;
A flat sealing portion that is disposed on the upper side of the transparent substrate so as to face the light emitting element, and seals the light emitting element with a space between the transparent substrate;
A desiccant disposed in a part of the region overlapping the display region of the transparent substrate when viewed from the direction orthogonal to the substrate surface of the transparent substrate on the side of the sealing portion facing the light emitting element; An electro-optical device comprising:
An electro-optical device comprising a colored layer having a color closer to the color of the desiccant than a surface of the sealing portion facing the light emitting element than the surface of the sealing portion facing the light emitting element. . 4. The electro-optical device according to claim 3, wherein the color of the desiccant and the colored layer provided on the surface of the sealing portion facing the light emitting element have the same color. A transparent substrate;
A single or a plurality of light emitting elements formed on the transparent substrate;
A flat sealing portion that is disposed on the upper side of the transparent substrate so as to face the light emitting element, and seals the light emitting element with a space between the transparent substrate;
A desiccant disposed in a part of the region overlapping the display region of the transparent substrate when viewed from the direction orthogonal to the substrate surface of the transparent substrate on the side of the sealing portion facing the light emitting element; An electro-optical device comprising:
An electro-optical device, wherein a colored layer is provided on a surface of the sealing portion facing the light emitting element and a surface of the desiccant facing the light emitting element. A transparent substrate;
A single or a plurality of light emitting elements formed on the transparent substrate;
A flat sealing portion that is disposed on the upper side of the light emitting element so as to face the light emitting element, and seals the light emitting element with a space between the transparent substrate;
The sealing portion is disposed in a part of the region that overlaps the display region of the transparent substrate when viewed from the direction orthogonal to the substrate surface of the transparent substrate on the side facing the light emitting element. An electro-optical device comprising: a desiccant having the same color as the color of the stop portion on the side facing the light emitting element. The electro-optical device according to any one of claims 2, 4, and 6, wherein the same color is black. The electro-optical device according to any one of claims 1 to 7, wherein the sealing portion includes a metal. A transparent substrate;
A single or a plurality of light emitting elements formed on the transparent substrate;
A flat sealing portion that is disposed on the upper side of the light emitting element so as to face the light emitting element, seals the light emitting element with the transparent substrate, and includes colored glass;
A desiccant disposed in a part of the surface of the sealing portion facing the light emitting element, the region overlapping with the display region of the transparent substrate when viewed from a direction orthogonal to the substrate surface of the transparent substrate; An electro-optical device comprising: The electro-optical device according to claim 9, wherein a color of the desiccant and a color of the sealing portion are the same color. The desiccant has a flat plate shape,
The said sealing part is provided with the groove part by which the said desiccant is embedded at least partially in the said one part area so that it may open to the said opposing surface side. The electro-optical device described. The electro-optical device according to claim 1, wherein the light emitting element is an organic EL light emitting element. An electronic apparatus comprising the electro-optical device according to any one of claims 1 to 12.

Images