JP4835187B2 - Electroluminescence device and electronic device - Google Patents

Description

  The present invention has an element substrate on which a light emitting element is formed corresponding to a pixel, and a sealing substrate bonded to the element substrate so as to emit light emitted from the light emitting element from the sealing substrate side. The present invention relates to an electroluminescence device having a configuration of taking out. Further, the present invention relates to an electronic device equipped with the electroluminescence device.

  An electroluminescence (hereinafter also abbreviated as “EL”) device having the above structure is included in an EL device called a top emission type, and color elements are often formed on the opposing surface of the sealing substrate. Here, the color element is a substance that can change the transmitted light to a predetermined color (for example, red, green, blue, etc.) by absorbing a specific wavelength component of incident light, and is also called a color filter. . A color element having a color corresponding to the color of the pixel is arranged for each pixel. By arranging the color elements on the sealing substrate, the color purity of the light extracted from the EL device can be improved, the color change due to the viewing angle can be suppressed, and the reflection of external light can be reduced. It can be blocked to some extent.

  In general, a light shielding layer is formed in a region between color elements, that is, a region corresponding to a pixel to prevent color mixture between adjacent pixels. The emitted light may enter the adjacent pixel beyond the light shielding layer and cause color mixing. In addition, when foreign matter is mixed between the substrates, the color mixture is more likely to occur if the distance between the substrates is increased so that the foreign matter does not adversely affect the light emitting element. When such color mixture occurs, the hue changes when the EL device is observed from a wide angle, so that the viewing angle characteristics deteriorate. As a technique for preventing this phenomenon, a technique is known in which a light shielding layer is formed thicker than a color element, and oblique light that causes color mixing is shielded by the light shielding wall (see Patent Document 1). In this paper, the light-shielding layer with such a thickness is called “light-shielding wall”.

JP 2005-294057 A

  However, there is a problem that it is technically difficult to form only the light-shielding wall thicker (higher) than the color elements. In particular, in the case where the distance between the substrates is increased for the above-described reason, the light shielding wall must be formed so as to be high in order to obtain a sufficient light shielding effect, and this problem becomes remarkable.

  In view of the above problems, an object of the present invention is to provide an electroluminescence device that has a light-shielding wall that can be easily formed high and can prevent color mixing by the light-shielding effect of the light-shielding wall, and the electro An object is to provide an electronic device equipped with a luminescence device.

  In order to solve the above problems, an electroluminescent device according to the present invention includes an electroluminescent device having a plurality of pixels corresponding to at least three different colors arranged in a matrix along a plurality of rows and columns. A device, comprising: a first substrate; a plurality of light emitting elements including a light emitting layer formed on the first substrate corresponding to the pixels; and the light emitting elements of the first substrate. A light-transmitting second substrate bonded to the first substrate through an adhesive, and a surface facing the second substrate, corresponding to the pixels. A color element of a color corresponding to the pixel; and the color element formed in a region between the pixels adjacent to each other on the opposing surface of the second substrate; and a light shielding member having a light shielding property A light shielding wall laminated in this order Characterized in that it.

  According to the above configuration, color elements are formed on the opposing surface of the second substrate in accordance with the pixels, and a light shielding wall that is thicker (that is, higher in height) than the color elements is formed in the inter-pixel region. Has been. Since the light shielding wall is formed by overlapping the light shielding member on the color element, it can be easily formed high. In the electroluminescence device having the above structure, most of the light emitted from the light emitting element formed on the first substrate is the same as the light emitting element among the color elements on the second substrate facing each other. The light enters a color element formed on the pixel. On the other hand, light emitted obliquely from the light emitting element toward the color element of the adjacent pixel is blocked by the light blocking wall. For this reason, color mixing between adjacent pixels corresponding to different colors does not easily occur, and the hue does not easily change even when observed from a wide angle. As described above, according to the above configuration, an electroluminescence device having a light shielding wall that can be easily formed high and capable of preventing color mixing by the light shielding effect of the light shielding wall is obtained. The electroluminescent device can emit high-quality light with good viewing angle characteristics.

  In the electroluminescence device, it is preferable that the color elements included in the light shielding wall are formed by stacking color elements of at least two colors. According to such a configuration, the light shielding wall is formed by stacking color elements of two or more different colors and further stacking the light shielding member thereon. Since such a light shielding wall can be easily formed high, for example, even if the interval between the first substrate and the second substrate is increased, light emitted in an oblique direction that causes color mixing is effective. Therefore, it is possible to prevent color mixing.

  In the electroluminescence device, it is preferable that the light shielding wall further includes a resin material disposed between the color element and the light shielding member. According to such a configuration, the light shielding wall is formed by stacking color elements of one, two, or three or more different colors and further laminating the resin material and the light shielding member in this order. . Since such a light shielding wall can be easily formed high, light emitted in an oblique direction that causes color mixing can be more effectively shielded and color mixing can be prevented.

  In the above electroluminescence device, it is preferable that the light shielding wall is formed in a region between the pixels adjacent to each other and having different colors. According to such a configuration, the light shielding wall is formed in a region between adjacent pixels having different corresponding colors. Light emitted from one of these adjacent pixels and incident on the color element of the other pixel always causes color mixing, but the light shielding wall can block such light, thus preventing color mixing. Can do. Here, in the above configuration, a light shielding wall is not necessarily provided in a region between adjacent pixels having the same corresponding color. When the light shielding wall is not provided in the region, the amount of the light shielding wall used can be reduced and the process for forming the light shielding wall can be shortened or simplified.

  In the electroluminescence device, the at least three different colors are preferably three colors of a red color, a green color, and a blue color. According to the electroluminescence device having such a configuration, color light emission or color display by a combination of light emission of a red color, a green color, and a blue color can be performed. Further, since the color mixture between the three colors is prevented by the light shielding wall that can be easily formed high, high-quality light emission with good viewing angle characteristics can be performed.

  In the electroluminescence device, the light emitting element emits light having a color similar to the color corresponding to the pixel on which the light emitting element is formed, and the light shielding wall includes the pixel corresponding to the green color, Preferably, the pixel is formed in a region between the pixel of the red color or the blue color adjacent to the pixel. In the electroluminescence device having such a configuration, the light emitting elements formed in the pixels corresponding to the red, green, and blue colors have red, green, and blue colors, respectively. Emits colored light. In addition, light shielding walls are formed in regions between adjacent pixels corresponding to green and red colors and between adjacent pixels corresponding to green and blue colors. Light emitted from one of these adjacent pixels and incident on the color element of the other pixel always causes color mixing, but the light shielding wall can block such light, thus preventing color mixing. Can do. Here, in the above configuration, a light shielding wall is not necessarily provided in a region between adjacent pixels corresponding to a red color and a blue color. This is because the red light emitted from the red color pixel is mostly absorbed by the color element even if it is incident on the color element of the adjacent blue color pixel. This is because most of the blue light emitted from the pixel is absorbed by the color element even if it is incident on the color element of the adjacent red pixel. If no light shielding wall is provided in the region between the red color pixel and the blue color pixel, the amount of light shielding wall material used can be reduced and the light shielding wall forming process can be shortened. It can be simplified.

  An electronic apparatus according to the present invention includes the above-described electroluminescence device. Such an electronic device can perform high-quality display with good viewing angle characteristics by the electroluminescence device.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the drawings shown below, the dimensions and ratios of the components are appropriately different from the actual ones in order to make the components large enough to be recognized on the drawings.

(First embodiment)
FIG. 1 is a schematic cross-sectional view showing an organic EL device 1 as an “electroluminescence device”. As shown in this figure, the organic EL device 1 includes a reflective film 12, an insulating layer 14, a pixel electrode 16 as an anode, a hole transport layer 18, an organic light emitting layer 20, an electron transport layer 22, and a cathode on a substrate 10. 24, color elements 34R, 34G, and 34B (hereinafter referred to as color elements 34R, 34G, and 34B) corresponding to red, green, and blue, respectively, on the element substrate formed by laminating the thin film sealing layer 26 in this order and the glass substrate 30. Are collectively referred to as a “color element 34”), and a sealing substrate on which the light shielding member 32 formed on the color element 34 is laminated via an adhesive 28. Here, the substrate 10 corresponds to the “first substrate”, the glass substrate 30 corresponds to the “second substrate”, and the organic light emitting layer 20 corresponds to the “light emitting layer” in the present invention. The organic EL device 1 is a so-called top emission type light emitting device configured to extract light emitted from the organic light emitting layer 20 from the sealing substrate side, and an observer observes the display from the glass substrate 30 side. Among the above elements, the light emitting element 70 is an element composed of components from the reflective film 12 to the cathode 24. The light emitting element 70 is formed for each pixel 40.

  FIG. 2 is an enlarged plan view of the organic EL device 1 for explaining the shape and arrangement of the pixels 40. In the following, the direction parallel to the X axis in FIG. 2 is also called the row direction, and the direction parallel to the Y axis is also called the column direction. As shown in the figure, the light shielding member 32 is formed in a lattice shape composed of linear elements parallel to the X axis and the Y axis. Each rectangular area formed by the grid of the light shielding members 32 corresponds to the pixel 40. That is, the pixels 40 are arranged in a matrix along a plurality of rows and columns. In addition, the area | region between the pixel 40 and the pixel 40 is also called the interpixel area | region 41 below. The light shielding member 32 described above is formed in the inter-pixel region 41.

  Each pixel 40 has a long rectangle in the column direction, and the pixels 40B, 40G, and 40R are arranged in this order along the row direction. Here, the pixels 40B, 40G, and 40R are pixels 40 that emit blue light, green light, and red light, respectively. Each pixel 40 is formed with a color element 34 of a corresponding color, that is, color elements 34B, 34G, and 34R. The pixels 40 are arranged so that the pixels 40 of the same color form a column. Note that FIG. 1 described above is a cross-sectional view of the organic EL device 1 taken along the row direction in FIG. 2 at a position including the pixels 40.

  As shown in FIG. 1, the light shielding member 32 that is disposed in the inter-pixel region 41 and partitions the pixel 40 is formed on the color element 34. Here, the laminated structure including the color element 34 and the light shielding member 32 in the inter-pixel region 41 is also referred to as a light shielding wall 33 below.

  Hereinafter, each component in FIG. 1 will be described in detail. The substrate 10 is formed with a TFT (Thin Film Transistor) element, various wirings (a data line, a scanning line, etc. for driving the TFT element), an insulating film, etc. on a glass substrate, a quartz substrate, etc. using a known technique. This is a so-called TFT element substrate. The reflective film 12 is made of aluminum or silver. The pixel electrode 16 is a transparent electrode made of ITO (Indium Tin Oxide) disposed on the reflective film 12 with an insulating layer 14 made of SiN for preventing a short circuit with the reflective film 12 interposed therebetween. One pixel electrode 16 is arranged for each pixel 40, and each pixel electrode 16 is connected to a data line (not shown) via a TFT element included in the substrate 10. The cathode 24 is made of an alloy of magnesium and silver in a half mirror state, and has both light reflectivity and light transmissivity.

  Between the pixel electrode 16 and the cathode 24, a hole transport layer 18, an organic light emitting layer 20, and an electron transport layer 22 are laminated in this order. The organic light emitting layer 20 is a layer of an organic light emitting material that exhibits an electroluminescence phenomenon. By applying a voltage between the pixel electrode 16 and the cathode 24, holes are injected from the hole transport layer 18 into the organic light emitting layer 20 and electrons are injected from the electron transport layer 22. When these are recombined, light emission occurs. A part of the light from the organic light emitting layer 20 is directly transmitted through the cathode 24, and a part of the light is reflected by the reflective film 12 and then transmitted through the cathode 24. In any case, the light from the organic light emitting layer 20 passes through the cathode 24, and then passes through the thin film sealing layer 26, the adhesive 28, the color element 34, and the glass substrate 30 in order.

  Here, the reflective film 12 and the cathode 24 constitute a so-called optical resonator. For this reason, the light emitted from the organic light emitting layer 20 reciprocates between the reflective film 12 and the cathode 24, and only the light having the resonance wavelength is amplified and extracted from the sealing substrate side. Accordingly, light having a spectrum with a high peak intensity and a narrow width can be extracted, and the color reproducibility of light emitted by the organic EL device 1 can be improved.

  The resonance wavelength can be adjusted by changing the length of the optical resonator. In the organic EL device 1, the length of the optical resonator is adjusted by changing the thickness of the pixel electrode 16. More specifically, the length of the optical resonator and the resonance wavelength are increased in this order by increasing the thickness of the pixel electrode 16 in this order in the pixels 40B, 40G, and 40R. Specifically, the thicknesses of the pixel electrodes 16 in the pixels 40B, 40G, and 40R are 20 nm, 50 nm, and 90 nm, respectively. Thereby, the resonance wavelength is set to a wavelength corresponding to blue in the pixel 40B, green in the pixel 40G, and red in the pixel 40R. As a result, blue, green, or red light is selectively emitted from the cathode 24 in accordance with the resonance wavelength.

  The thin film sealing layer 26 formed so as to cover the cathode 24 is a light-transmitting member made of SiON, protects the organic EL element 70, and forms a step of the cathode 24 formed for forming an optical resonator. To fill and smooth.

  The color element 34 formed on the glass substrate 30 is a member that colors transmitted light by absorbing a specific wavelength component of incident light. The color element 34 is formed, for example, by applying a photosensitive resin containing a pigment as a color element material and exposing and developing it. By arranging the color element 34, the color purity of the light extracted from the organic EL device 1 can be improved, the change in color due to the viewing angle can be suppressed, and the reflection of external light can be blocked to some extent. The color element 34 faces the thin film sealing layer 26 with an adhesive 28 made of an epoxy resin.

  The light shielding member 32 arranged so as to overlap the color element 34 is a black resin that hardly transmits light, and constitutes a part of the light shielding wall 33 as described above. The light shielding member 32 is formed by applying a resin as a material on the color element 34, exposing and developing the resin, and patterning it in a lattice shape as shown in FIG. Since the light shielding wall 33 is formed by overlapping the light shielding member 32 on the color element 34 as described above, it can be easily formed high. Hereinafter, the width of the light shielding member 32 (that is, the width of the light shielding wall 33) is W, and the height of the light shielding member 32 from the surface of the color element 34 is T. The distance from the color element 34 to the cathode 24 is L.

  Here, the behavior of light emitted from the light emitting element 70 and the operation and effect of the light shielding wall 33 will be described.

  Light emitted from the light emitting element 70 is incident on the sealing substrate at various angles. Hereinafter, as shown in FIG. 1, the light emission angle from the light emitting element 70 is θ. Since the refractive index of the adhesive 28, the color element 34, and the glass substrate 30 that are the optical paths of this light is approximately 1.51, all light having an emission angle θ greater than 42 ° is all at the interface between the glass substrate 30 and the air layer. Reflected and not visible to the viewer. Therefore, even if such light enters the color elements of different colors of the adjacent pixels 40 and causes color mixing, the display is not affected. Conversely, light having an emission angle of 42 ° or less is extracted from the glass substrate 30 to the air layer and can be visually recognized by an observer. When such light enters the color elements of different colors of the adjacent pixels 40, the light is emitted to the air layer in a mixed state, resulting in deterioration of display quality.

The light shielding wall 33 shields light that enters the color element 34 of the adjacent pixel 40 out of the light emitted from the light emitting element 70 of a certain pixel 40 so as to satisfy θ ≦ 42 °. Therefore, the light shielding member 32 is formed so that the height T satisfies the following formula (1).
tan42 ° ≦ W / (LT) (1)
In an organic EL device having a conventional general configuration, that is, a configuration in which the light shielding member 32 having the same height as the color element 34 is disposed in the inter-pixel region 41, the following formula (2) is used to prevent color mixture. It was requested.
tan42 ° ≦ W / L (2)
Comparing this with the above formula (1), the organic EL device 1 of the present embodiment has a length L (and hence a distance between the element substrate and the sealing substrate) of the light shielding member 32 without causing color mixing. It can be seen that the size can be increased by the length T. Specifically, when W = 20 μm, color mixing occurs when the length L exceeds 22 μm in the conventional configuration, but in this embodiment, for example, when T = 3 μm, the length L is 25 μm. Can be up to. If the length L can be increased in this way, the distance between the substrates can be increased, and even when a large foreign matter is mixed between the substrates, the foreign matter can be prevented from affecting the light emitting element 70.

  As described above, the light shielding wall 33 can shield light that may be extracted to the air layer among light emitted obliquely from the light emitting element 70 toward the color element 34 of the adjacent pixel 40. . For this reason, color mixing between adjacent pixels 40 corresponding to different colors hardly occurs, and even when observed from a wide angle, the hue hardly changes. Thus, the organic EL device 1 can perform high-quality light emission with good viewing angle characteristics.

(Second Embodiment)
Next, an organic EL device 1A according to the second embodiment will be described with reference to the cross-sectional view of FIG. Since the organic EL device 1A is the same as the organic EL device 1 of the first embodiment except for the configuration of the light shielding wall 33, the following description focuses on the differences.

  As shown in FIG. 3, the light shielding wall 33 in the organic EL device 1 </ b> A includes two different color elements 34 and a light shielding member 32 stacked thereon. The light shielding wall 33 is manufactured by the following manufacturing method. That is, first, the color element 34R is formed in the region corresponding to the pixel 40R on the glass substrate 30 and the inter-pixel region 41 adjacent to the pixel 40R. Next, the color element 34G is formed in the region corresponding to the pixel 40G and the inter-pixel region 41 adjacent to the pixel 40G. At this time, the color element 34R and the color element 34G are stacked in the inter-pixel region 41 between the pixel 40R and the pixel 40G. Subsequently, the color element 34B is formed in the region corresponding to the pixel 40B and the inter-pixel region 41 adjacent to the pixel 40B. At this time, in the inter-pixel region 41 between the pixel 40R and the pixel 40B, the color element 34R and the color element 34B are stacked, and in the inter-pixel region 41 between the pixel 40G and the pixel 40B, the color element 34G. And the color element 34B are stacked. Finally, the light shielding member 33 is laminated on the inter-pixel region 41 to complete the light shielding wall 33.

  Since the light shielding wall 33 is formed by further stacking the light shielding member 32 on the two color elements 34 as described above, the light shielding wall 33 is formed higher than the case where the color element 34 is one layer. Can do. Moreover, since the thickness (height) of each component of the light shielding wall 33 is the same as that of the first embodiment, it can be easily formed high.

  Also in the organic EL device 1 </ b> A, such light shielding wall 33 shields light that may be extracted into the air layer out of light emitted obliquely from the light emitting element 70 toward the color element 34 of the adjacent pixel 40. be able to. For this reason, color mixing between adjacent pixels 40 corresponding to different colors hardly occurs, and even when observed from a wide angle, the hue hardly changes. In addition, since the light shielding wall 33 can be formed high, the distance between the substrates can be increased while maintaining the light shielding function.

(Third embodiment)
Next, an organic EL device 1B according to the third embodiment will be described with reference to a cross-sectional view of FIG. Since the organic EL device 1B is the same as the organic EL device 1 of the first embodiment except for the configuration of the light shielding wall 33, the following description focuses on the differences.

  As shown in FIG. 4, the light shielding wall 33 in the organic EL device 1 </ b> B includes three different color elements 34 and a light shielding member 32 stacked thereon. The light shielding wall 33 is manufactured by the following manufacturing method. That is, first, the color element 34R is formed in the region corresponding to the pixel 40R on the glass substrate 30 and all the inter-pixel regions 41. Next, the color element 34G is formed in the region corresponding to the pixel 40G and all the inter-pixel regions 41. At this time, in each inter-pixel region 41, the color element 34R and the color element 34G are stacked. Subsequently, the color element 34B is formed in the region corresponding to the pixel 40B and all the inter-pixel regions 41. At this time, in each inter-pixel region 41, the color element 34B is stacked on the color element 34R and the color element 34G. Finally, the light shielding wall 33 is completed by laminating the light shielding members 32 in all the inter-pixel regions 41.

  Since the light shielding wall 33 is formed by further stacking the light shielding member 32 on the three color elements 34 as described above, the light shielding wall 33 is higher than the case where the color elements 34 are one layer or two layers. Can be formed. Moreover, since the thickness (height) of each component of the light shielding wall 33 is the same as that of the first embodiment, it can be easily formed high.

  Also in the organic EL device 1B, the light shielding wall 33 shields light that may be extracted into the air layer out of light emitted obliquely from the light emitting element 70 toward the color element 34 of the adjacent pixel 40. be able to. For this reason, color mixing between adjacent pixels 40 corresponding to different colors hardly occurs, and even when observed from a wide angle, the hue hardly changes. Further, since the light shielding wall 33 can be formed high, the distance between the substrates can be further increased while maintaining the light shielding function.

(Fourth embodiment)
Next, an organic EL device 1C according to the fourth embodiment will be described with reference to a cross-sectional view of FIG. Since the organic EL device 1C is the same as the organic EL device 1 of the first embodiment except for the configuration of the light shielding wall 33, the following description will focus on the differences.

  As shown in FIG. 5, the light shielding wall 33 in the organic EL device 1 </ b> C has a configuration in which a resin material 31 and a light shielding member 32 are laminated in this order on the color element 34. Here, since the resin material 31 is a member for forming the light shielding wall 33 higher, the characteristics thereof are not particularly limited. Since the light shielding property of the light shielding wall 33 is ensured by the light shielding member 32, the resin material 31 may have a light transmitting property. For this reason, the transparent resin generally used as an overcoat can be used. Of course, the resin material 31 may have a light shielding property like the light shielding member 32, or may color the transmitted light similarly to the color element.

  The light shielding wall 33 is manufactured by the following manufacturing method. That is, first, the three color elements 34 are formed on the glass substrate 30 as in the first embodiment. Next, the resin material 31 is formed on the color element 34 in the inter-pixel region 41. This step can be performed by, for example, a spin coating method and a photolithography method. Finally, the light shielding member 32 is laminated on the resin material 31 to complete the light shielding wall 33.

  Since the light shielding wall 33 is formed by further laminating the resin material 31 and the light shielding member 32 on the color element 34 as described above, the light shielding wall 33 is compared with the case where the light shielding wall 33 is configured by one color element 34 and the light shielding member 32. Highly formed. Moreover, since the thickness (height) of each component of the light shielding wall 33 is the same as that of the first embodiment, it can be easily formed high.

  Also in the organic EL device 1 </ b> C, such light shielding wall 33 shields light that may be extracted into the air layer out of light emitted obliquely from the light emitting element 70 toward the color element 34 of the adjacent pixel 40. be able to. For this reason, color mixing between adjacent pixels 40 corresponding to different colors hardly occurs, and even when observed from a wide angle, the hue hardly changes. Further, since the light shielding wall 33 can be formed high, the distance between the substrates can be further increased while maintaining the light shielding function.

  The above is a configuration in which the resin material 31 and the light shielding member 32 are stacked on the one-layer color element 34. Instead, the two-layer color element 34 is formed as in the second embodiment. A structure in which the resin material 31 and the light shielding member 32 are laminated thereon, or a structure in which the three color elements 34 are formed and the resin material 31 and the light shielding member 32 are laminated thereon as in the third embodiment. It can also be. According to such a configuration, the light shielding wall 33 can be formed higher.

(Fifth embodiment)
Next, an organic EL device 1D according to the fifth embodiment will be described with reference to a cross-sectional view of FIG. Since the organic EL device 1D is the same as the organic EL device 1C of the fourth embodiment except for the region where the resin material 31 is formed, the following description focuses on the differences.

  As shown in FIG. 6, the light shielding wall 33 of the organic EL device 1 </ b> D has a configuration in which a resin material 31 and a light shielding member 32 are laminated on the color element 34. Here, the resin material 31 is formed not only as a part of the light shielding wall 33 but also covering the entire color element 34, and plays a role of protecting the color element 34 and improving flatness. A member having translucency is used for the resin material 31 of the present embodiment.

  Also in the organic EL device 1D, light that may be extracted to the air layer out of light emitted obliquely from the light emitting element 70 toward the color element 34 of the adjacent pixel 40 is shielded by the light shielding wall 33. Can do. For this reason, color mixing between adjacent pixels 40 corresponding to different colors hardly occurs, and even when observed from a wide angle, the hue hardly changes. Further, since the light shielding wall 33 can be formed high, the distance between the substrates can be further increased while maintaining the light shielding function.

(Sixth embodiment)
Next, an organic EL device 1E according to the sixth embodiment will be described with reference to a plan view of FIG. Since the organic EL device 1E is the same as the organic EL device 1 of the first embodiment except for the formation region of the light shielding member 32, the following description focuses on the differences.

  As shown in FIG. 7, in the organic EL device 1 </ b> E, the light shielding member 32 and the light shielding wall 33 including the light shielding member 32 are formed only in the column direction except for the outer peripheral portion, and are formed in the row direction. Not. In other words, the light shielding member 32 (light shielding wall 33) is formed only in a region between the pixels 40 of different colors corresponding to each other. A cross-sectional view of the organic EL device 1E taken along the row direction in FIG. 7 at a position including the pixels 40 is the same as the organic EL device 1 of the first embodiment, and corresponds to FIG. To do.

  Even in such a configuration, the light shielding wall 33 exhibits the effect of preventing color mixing, and the organic EL device 1E can perform high-quality light emission with good viewing angle characteristics. This is because color mixing occurs only between adjacent pixels 40 of different colors corresponding to each other, and a light shielding wall 33 that prevents color mixing is formed between the adjacent pixels 40. Thus, if it is set as the structure which forms the light-shielding wall 33 partially, while the usage-amount of the material of the light-shielding wall 33 can be reduced, the formation process of the light-shielding wall 33 can be shortened or simplified.

  In addition, although the above changed the formation area of the light shielding member 32 in the organic EL device 1 of the first embodiment, the same change relates to any one of the second to fifth embodiments. It can also be performed for the organic EL devices 1A, 1B, 1C, and 1D.

(Seventh embodiment)
Next, an organic EL device 1F according to the seventh embodiment will be described with reference to FIGS. FIG. 8 is an enlarged plan view of the organic EL device 1F. FIG. 9 is a cross-sectional view of the organic EL device 1F taken along the row direction in FIG. Since the organic EL device 1F is the same as the organic EL device 1 of the first embodiment except for the formation region of the light shielding member 32, the following description focuses on the differences.

  As shown in FIGS. 8 and 9, in the organic EL device 1 </ b> F, the light shielding member 32 and the light shielding wall 33 including the light shielding member 32 are formed only in the column direction except for the outer peripheral portion, and the pixels It is formed only in the inter-pixel region 41 adjacent to 40G. That is, they are not formed in the inter-pixel region 41 of the pixels 40R and 40B or the inter-pixel region 41 parallel to the row direction.

  The reason why the light shielding wall 33 is unnecessary in the inter-pixel region 41 of the pixel 40R and the pixel 40B is as follows. In other words, even if the red light emitted from the pixel 40R is incident on the color element 34B of the adjacent pixel 40B, most of the red light is absorbed here because the color element 34B hardly transmits the red light. The Similarly, even if the blue light emitted from the pixel 40B is incident on the color element 34R of the adjacent pixel 40R, the color element 34R hardly absorbs the blue light, so that most of the blue light is absorbed here. Is done. As described above, between the pixels 40R and 40B, the light incident on the other pixel 40B (40R) from the one pixel 40R (40B) is absorbed by the color element 34R or the color element 34B. Even when there is no light shielding wall 33 in the region 41, color mixing hardly occurs.

  Therefore, also in the above configuration, the light shielding wall 33 exhibits the effect of preventing color mixing, and the organic EL device 1F can perform high-quality light emission with good viewing angle characteristics. Thus, if it is set as the structure which forms the light-shielding wall 33 partially, while the usage-amount of the material of the light-shielding wall 33 can be reduced, the formation process of the light-shielding wall 33 can be shortened or simplified.

  In addition, although the above changed the formation area of the light shielding member 32 in the organic EL device 1 of the first embodiment, the same change relates to any one of the second to fifth embodiments. It can also be performed for the organic EL devices 1A, 1B, 1C, and 1D.

  Further, the present embodiment can be suitably used for an organic EL device having a configuration in which light of any one of red, green, and blue is emitted from the light emitting element 70. For this reason, it replaces with the light emitting element 70 using an optical resonator, for example, is applied also to the organic EL apparatus provided with the light emitting element 70 containing the organic light emitting layer 20 which can emit each light of red, green, and blue. can do.

(Eighth embodiment)
Next, an organic EL device 1G according to the eighth embodiment will be described with reference to a cross-sectional view of FIG. Since the organic EL device 1G is the same as the organic EL device 1 of the first embodiment with respect to the sealing substrate, the following description will focus on differences in the configuration of the element substrate.

  As shown in FIG. 10, the element substrate of the organic EL device 1G includes a reflective film 12, an insulating layer 14, a pixel electrode 16 as an anode, a hole transport layer 18, an organic light emitting layer 20, and an electron transport layer on the substrate 10. 22, a cathode 24, and a thin film sealing layer 26 are laminated in this order. Here, the difference from the configuration of the organic EL device 1 of the first embodiment is that the thickness of the pixel electrode 16 is uniform in all the pixels 40 and the cathode 24 is made of transparent ITO. For this reason, the light emitting element 70 does not include an optical resonator, and is configured to simply extract light emitted from the organic light emitting layer 20 from the cathode 24 side. That is, each light emitting element 70 emits light of the same hue.

  Also in the organic EL device 1G having such a configuration, when light emitted from a certain pixel 40 travels obliquely and enters a color element 34 of an adjacent pixel 40, an unintended color is generated in a pixel 40 different from the originally intended pixel 40. Will be emitted, leading to a reduction in display quality. The light shielding wall 33 can shield the light traveling obliquely and prevent such a phenomenon.

  Although the above is a change in the configuration of the element substrate in the organic EL device 1 of the first embodiment, the same change is the organic EL according to any one of the second to sixth embodiments. It can also be performed on the devices 1A, 1B, 1C, 1D, 1E.

(Example of mounting on electronic equipment)
The above-described organic EL device 1 (including the organic EL devices 1A to 1G) can be used by being mounted on, for example, a mobile phone 500 as an “electronic device” as shown in FIG. The mobile phone 500 includes a display unit 510 and operation buttons 520. The display unit 510 can perform high-quality display with good viewing angle characteristics with respect to various information including the contents input with the operation buttons 520 and incoming information by the organic EL device 1 incorporated therein.

  The organic EL device 1 to which the present invention is applied can be used in various electronic devices such as a mobile computer, a digital camera, a digital video camera, an in-vehicle device, and an audio device in addition to the mobile phone 500 described above.

  As mentioned above, although embodiment of this invention was described, various deformation | transformation can be added with respect to the said embodiment in the range which does not deviate from the meaning of this invention. As modifications, for example, the following can be considered.

(Modification 1)
In each of the first to seventh embodiments, the light emitting element 70 emits light of each color of red, green, and blue using an optical resonator. Instead of this, red, green, and blue are used. It is good also as a structure using the organic light emitting layer 20 which emits each color of these. Even when combined with the light emitting element 70 having such a configuration, the light shielding wall 33 exhibits an effect of preventing color mixing.

(Modification 2)
In each of the embodiments described above, the pixel 40 and the color element 34 are configured to correspond to three colors of red, green, and blue, but may be configured to correspond to four or more colors instead. For example, a configuration corresponding to four colors obtained by adding two colors selected from the hues of blue to yellow to two colors of red and blue can be adopted. The latter two colors can be, for example, green and cyan.

(Modification 3)
In each of the above embodiments, the hole transport layer 18 and the electron transport layer 22 included in the light emitting element 70 may be disposed as necessary, and may not be necessarily formed. The thin film sealing layer 26 can also be omitted when the adhesive 28 also has a similar function.

1 is a cross-sectional view of an organic EL device according to a first embodiment. FIG. 3 is an enlarged plan view of the organic EL device according to the first embodiment. Sectional drawing of the organic electroluminescent apparatus which concerns on 2nd Embodiment. Sectional drawing of the organic electroluminescent apparatus which concerns on 3rd Embodiment. Sectional drawing of the organic electroluminescent apparatus which concerns on 4th Embodiment. Sectional drawing of the organic electroluminescent apparatus which concerns on 5th Embodiment. Sectional drawing of the organic electroluminescent apparatus which concerns on 6th Embodiment. FIG. 10 is an enlarged plan view of an organic EL device according to a seventh embodiment. Sectional drawing of the organic electroluminescent apparatus which concerns on 7th Embodiment. Sectional drawing of the organic electroluminescent apparatus which concerns on 8th Embodiment. 1 is a schematic perspective view of a mobile phone according to an embodiment of an electronic device of the present invention.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1,1A-1G ... Organic EL device, 10 ... Substrate as "first substrate", 12 ... Reflective film, 14 ... Insulating layer, 16 ... Pixel electrode, 18 ... Hole transport layer, 20 ... Organic light emitting layer, 22 ... Electron transport layer, 24 ... Cathode, 26 ... Thin film sealing layer, 28 ... Adhesive, 30 ... Glass substrate as "second substrate", 31 ... Resin material, 32 ... Light shielding member, 33 ... Light shielding wall, 34, 34R, 34G, 34B ... color elements, 40, 40R, 40G, 40B ... pixels, 70 ... light emitting elements, 500 ... mobile phones.

Claims (7)

An electroluminescent device having a plurality of pixels arranged in a matrix along a plurality of rows and columns and corresponding to at least three different colors,
A first substrate;
A pixel electrode disposed on the first substrate corresponding to the pixel;
A cathode disposed on the pixel electrode;
A plurality of light emitting elements including a light emitting layer disposed between the pixel electrode and the cathode ;
A second substrate made of a light-transmitting glass bonded to the first substrate with an adhesive facing the surface of the first substrate on which the light emitting element is formed;
A color element of a color corresponding to the pixel formed on the opposing surface of the second substrate corresponding to the pixel;
Of the opposing surfaces of said second substrate, which is formed in a region between the adjacent pixels, and the color element, a light shielding member having a light shielding property have a light-shielding wall which are laminated in this order ,
When the width of the light shielding member is W, the height of the light shielding member from the surface of the color element is T, and the distance from the color element surface to the surface of the cathode is L,
tan42 ° ≦ W / (L−W)
An electroluminescent device characterized by satisfying the above. The electroluminescent device according to claim 1,
The electroluminescent device according to claim 1, wherein the color elements included in the light shielding wall are formed by stacking color elements of at least two kinds of colors. The electroluminescent device according to claim 1 or 2,
The electroluminescence device, wherein the light shielding wall further includes a resin material disposed between the color element and the light shielding member. The electroluminescence device according to any one of claims 1 to 3,
The electroluminescent device according to claim 1, wherein the light-shielding walls have different colors and are formed in regions between the adjacent pixels. An electroluminescent device according to any one of claims 1 to 4,
The at least three different colors are three colors of a red color, a green color, and a blue color. The electroluminescent device according to claim 5,
The light emitting element emits light of a color similar to the color corresponding to the pixel on which the light emitting element is formed,
The light shielding wall is formed in a region between the pixel corresponding to the green color and the pixel of the red color or the blue color adjacent to the pixel. An electroluminescence device.   An electronic apparatus comprising the electroluminescence device according to any one of claims 1 to 6.

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