JP2009109520A - Display device and electronic apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an organic EL display device increasing numerical aperture of a pixel and increasing definition of display by more densely arranging sub-pixels that are minimum units of image display. <P>SOLUTION: In the organic EL display device, a plurality of sub-pixels 15 including an organic EL element, and a contact part 20 for electrically connecting the organic EL element to a pixel circuit are arranged in a matrix state on a substrate 3 for forming an element 3. The contact parts 20 between the sub-pixels 15 adjacent in a row direction out of the row and column directions for arranging the sub-pixels 15 are inversely arranged in the row direction. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a display device and an electronic apparatus, and more particularly, to a flat-type (flat panel type) display apparatus in which pixels including electro-optic elements are arranged in a matrix (matrix form) and an electronic apparatus having the same.

  In recent years, in the field of display devices that display images, flat display devices in which pixels including light-emitting elements are arranged in a matrix are rapidly spreading. As a flat display device, as a light emitting element of a pixel, a so-called current-driven electro-optical element whose light emission luminance changes according to a current value flowing through the device, for example, a phenomenon of emitting light when an electric field is applied to an organic thin film is used. An organic EL display device using an organic EL (Electro Luminescence) element has been developed and commercialized.

  The organic EL display device has the following features. That is, since the organic EL element can be driven with an applied voltage of 10 V or less, it has low power consumption and is a self-luminous element. Therefore, for each pixel including the liquid crystal cell, the liquid crystal cell emits light from the light source (backlight). Compared to a liquid crystal display device that displays images by controlling the light intensity, the image is highly visible, and the liquid crystal display device does not require an illumination member such as a backlight. Is easy. Furthermore, since the response speed of the organic EL element is as high as about several μsec, no afterimage occurs when displaying a moving image.

  In the organic EL display device, as in the liquid crystal display device, a simple (passive) matrix method and an active matrix method can be adopted as the driving method. However, although the simple matrix display device has a simple structure, the light emission period of the electro-optic element is reduced by an increase in the number of scanning lines, which makes it difficult to realize a large and high-definition display device. is there.

  Therefore, at present, the current flowing through the electro-optic element is caused by an active element provided in the pixel circuit corresponding to the electro-optic element, for example, an insulated gate field effect transistor (generally, a TFT (Thin Film Transistor)). Active matrix display devices to be controlled have become mainstream (see, for example, Patent Document 1 and Patent Document 2). An active matrix display device can easily realize a large-sized and high-definition display device because the electro-optical element continues to emit light over a period of one frame.

  In general, an organic EL element used in an organic EL display device has a structure in which an organic layer made of an organic material is sandwiched between a cathode electrode and an anode electrode. When the organic EL element emits light, a positive voltage is applied to the anode electrode and a negative voltage is applied to the cathode electrode. As a result, holes are injected into the organic layer from the anode electrode side and electrons are injected from the cathode electrode side, and light is emitted by recombination inside the organic layer (light emitting layer). It has become.

  Pixels (hereinafter referred to as “sub-pixels”) that are the minimum unit of image display in an organic EL display device are classified according to the three primary colors of light, R (red), G (green), and B (blue). Provided. Each sub-pixel (sub-pixel) includes an organic EL element serving as an electro-optical element and a contact portion for electrically connecting the organic EL element to the pixel circuit. The pixel circuit is a circuit for controlling the current flowing through the electro-optical element (organic EL element). Usually, the pixel circuit is provided in a 1: 1 correspondence with the sub-pixel.

  FIG. 20 is a schematic plan view showing a pixel layout in a conventional organic EL display device. A transparent glass substrate is used as a transparent insulating substrate for a substrate 51 (hereinafter referred to as “element forming substrate”) 51 for forming an organic EL element. An auxiliary electrode 52 is formed in a rectangular frame shape on the element forming substrate 51, and a plurality of subpixels 53 are arranged in a region surrounded by the auxiliary electrode 52 (hereinafter referred to as “pixel region”). Are arranged side by side. Each sub-pixel 53 is provided with a contact portion 54. The contact portion 54 electrically connects, to the pixel circuit (not shown), an electrode (hereinafter referred to as a “pixel electrode”) that is partitioned and formed for each subpixel 53 out of the cathode electrode and the anode electrode that sandwich the organic layer as described above. It is provided to connect to.

JP 2001-195008 A JP 2004-207217 A

  In general, the aperture ratio of pixels in an organic EL display device depends on the area of subpixels per unit area, and the definition of display depends on the number of subpixels per unit area. Therefore, in order to realize a high aperture ratio of pixels and high definition of display, it is necessary to arrange more sub-pixels with a larger area in a limited pixel region.

  However, in the conventional organic EL display device, since the contact portion 54 is provided at the same position (lower left of the sub pixel 53) for all the sub pixels 53 arranged in the pixel region, the row direction (vertical) The contact portion 54 exists between all the sub-pixels 53 adjacent in the direction). For this reason, it is necessary to secure an area for forming the contact portion 54 between all the sub-pixels 53 adjacent in the row direction (vertical direction) in accordance with the rules and design rules in the manufacturing process. As a result, the arrangement of the sub-pixels 53 is sparse in the row direction.

In the display device according to the present invention, a plurality of sub-pixels including an electro-optical element and a contact portion for electrically connecting the electro-optical element to a pixel circuit are arranged in a matrix and arranged.
Of the row direction and the column direction, which are the arrangement directions of the sub-pixels, the positions of the contact portions of the sub-pixels adjacent in the first direction are arranged in an inverted state in the first direction. To do.

  In the display device according to the present invention and the electronic apparatus including the display device, the position of the contact portion of the sub-pixel adjacent in the first direction among the row direction and the column direction, which are the sub-pixel alignment directions, By arranging in a state reversed in the direction, the sub-pixels can be arranged in the first direction more densely than in the past.

  According to the present invention, sub-pixels can be arranged more densely than in the past. For this reason, it is possible to realize a high aperture ratio of pixels and high definition of display.

  Hereinafter, specific embodiments of the present invention will be described in detail with reference to the drawings.

<Configuration of display device>
FIG. 1 is a cross-sectional view showing a configuration of a main part of a display device to which the present invention is applied. Here, as an example, an active matrix type organic optical element using a current-driven electro-optic element whose emission luminance changes according to the current value flowing through the device, for example, an organic EL element (organic electroluminescence element) as a pixel light-emitting element. An EL display device will be described as an example.

  The organic EL display device 1 is configured using a plurality (large number) of organic EL elements 2. The organic EL element 2 is divided for each sub-pixel by the difference in emission color of R (red), G (green), and B (blue). However, FIG. 1 shows only one of them.

  The organic EL element 2 is configured using an element forming substrate 3. On the element formation substrate 3, a lower electrode 4, an insulating layer 5, an organic layer 6, and an upper electrode 7 are sequentially laminated together with a pixel circuit including an active element (not shown) such as a thin film transistor. Further, the upper electrode 7 is covered with a protective layer 8, and a counter substrate 10 is disposed on the protective layer 8 via an adhesive layer 9.

  The element forming substrate 3 and the counter substrate 10 are each composed of a transparent glass substrate (insulating substrate). The element forming substrate 3 and the counter substrate 10 face each other in such a manner that the lower electrode 4, the insulating layer 5, the organic layer 6, the upper electrode 7, the protective layer 8, and the adhesive layer 9 are sandwiched between the two substrates. It is arranged in a state to do.

  One of the lower electrode 4 and the upper electrode 7 serves as an anode electrode, and the other serves as a cathode electrode. The lower electrode 4 is made of a highly reflective material when the organic EL display device 1 is a top emission type, and is made of a transparent material when the organic EL display device 1 is a transmissive type.

  Here, as an example, it is assumed that the organic EL display device 1 is a top emission type, the lower electrode 4 is an anode electrode, and the upper electrode 7 is a cathode electrode. In this case, since the lower electrode 4 is partitioned and formed for each sub-pixel, it corresponds to a pixel electrode. On the other hand, the upper electrode 7 is a common electrode common to all subpixels. For this reason, the upper electrode 7 is formed in a solid shape on the entire surface of the element forming substrate 3 so as to cover the organic layer 6. The lower electrode 4 is made of, for example, silver (Ag), aluminum (Al), chromium (Cr), iron (Fe), cobalt (Co), nickel (Ni), copper (Cu), tantalum (Ta), tungsten (W) , Platinum (Pt), and gold (Au), which are made of a highly reflective conductive material or an alloy thereof.

  When the organic EL display device 1 is a top emission type and the lower electrode 4 is a cathode electrode, the lower electrode 4 is made of, for example, an aluminum (Al), indium (In), magnesium (Mg) -silver (Ag) alloy. , Such as a lithium (Li) -fluorine (F) compound and a lithium-oxygen (O) compound, which are made of a conductive material having a small work function and high light reflectance.

  When the organic EL display device 1 is a transmissive type and the lower electrode 4 is an anode electrode, the lower electrode 4 is, for example, ITO (Indium-Tin-Oxide) or IZO (Indium-Zinc-Oxide). It is composed of a conductive material with high transmittance. When the organic EL display device 1 is a transmissive type and the lower electrode 4 is a cathode electrode, the lower electrode 4 is made of a conductive material having a low work function and high light transmittance.

  The insulating layer 5 is formed on the upper surface of the element forming substrate 3 so as to cover the periphery of the lower electrode 4. A window is formed in each insulating layer 5 for each sub-pixel, and the lower electrode 4 is exposed at the opening of the window. The insulating layer 5 is formed using an organic insulating material such as polyimide or photoresist, or an inorganic insulating material such as silicon oxide.

  For example, as shown in FIG. 2, the organic layer 6 includes a hole injection layer 61, a hole transport layer 62, a light emitting layer 63 (63 r, 63 g, 63 b) and an electron transport layer 64 in order from the element forming substrate 3 side. It has a laminated structure of four layers.

  The hole injection layer 61 is formed of, for example, m-MTDATA [4,4,4-tris (3-methylphenylphenylamino) triphenylamine]. The hole transport layer 62 is formed of, for example, α-NPD [4,4-bis (N-1-naphthyl-N-phenylamino) biphenyl]. Note that the material is not limited to this, and hole transport materials such as a benzidine derivative, a styrylamine derivative, a triphenylmethane derivative, and a hydrazone derivative can be used. Moreover, the hole injection layer 61 and the hole transport layer 62 may each have a laminated structure including a plurality of layers.

  The light emitting layer 63 is formed of a different organic light emitting material for each RGB color component. Specifically, the red light emitting layer 63r includes, for example, 2,6≡bis [(4′≡methoxydiphenylamino) styryl] ≡1,5≡dicyanonaphthalene (BSN) as a dopant material to ADN as a host material. It is composed of a mixture of 30% by weight. The green light emitting layer 63g is composed of, for example, 5% by weight of coumarin 6 as a dopant material mixed with ADN as a host material. For example, the blue light emitting layer 63b is formed by adding 4,4′≡bis [2≡ {4≡ (N, N≡diphenylamino) phenyl} vinyl] biphenyl (DPAVBi) as a dopant material to ADN as a guest material. Consists of a mixture by weight%. The light emitting layers 63r, 63g, and 63b of the respective colors are arranged in a matrix shape similar to the sub pixel or a slit shape parallel to the row direction of the sub pixel, depending on the color arrangement of the pixels.

  The electron transport layer 64 is made of, for example, 8≡hydroxyquinoline aluminum (Alq3). The organic layer 6 is not limited to the four-layer structure illustrated here, and may be any layer including at least a light emitting layer. Specifically, the organic layer 6 has a five-layer structure in which an electron injection layer (not shown) is added in addition to the structure of the four layers (hole injection layer, hole transport layer, light-emitting layer, electron transport layer) described above. It may be a structure with fewer or more layers.

  The upper electrode 7 is made of a transparent or translucent conductive material when the organic EL display device 1 is a top emission type, and is made of a highly reflective material when the organic EL display device 1 is a transmission type. Is done.

  The element forming substrate 3, the lower electrode 4, the insulating layer 5, the organic layer 6, and the upper electrode 7 constitute the organic EL element 2 (red organic EL element 2r, green organic EL element 2g, blue organic EL element 2b). Has been.

  The protective layer 8 is formed for the purpose of preventing moisture from reaching the upper electrode 7 and the organic layer 6. For this reason, the protective layer 8 is formed with sufficient film thickness using a material with low water permeability and water absorption. Further, since the protective layer 8 needs to transmit light emitted from the organic layer 6 when the organic EL display device 1 is a top emission type, it is made of a material having a light transmittance of about 80%, for example. Composed.

  If the upper electrode 7 is formed of a metal thin film and the insulating protective layer 8 is formed directly on the metal thin film, an inorganic amorphous insulating material, for example, as a material for forming the protective layer 8 is used. Amorphous silicon (α-Si), amorphous silicon carbide (α-SiC), amorphous silicon nitride (α-Si1-xNx), and amorphous carbon (α-C) can be preferably used. Such an inorganic amorphous insulating material does not constitute grains, and therefore has a low water permeability and becomes a good protective layer 8.

  The adhesive layer 9 is formed of, for example, a UV (ultraviolet) curable resin. The adhesive layer 9 is for fixing the counter substrate 10.

  Although illustration is omitted here, when the organic EL display device 1 having such a configuration is provided with a combination of color filters, light emission emitted from the organic EL elements 2r, 2g, and 2b corresponding to each color of RGB. A color filter that transmits only light in the vicinity of the peak wavelength of the spectrum is provided on the light extraction surface side of each color organic EL element 2r, 2g, 2b.

<Configuration of drive circuit>
FIG. 3 is a diagram illustrating a configuration example of a drive circuit of the organic EL display device. The drive circuit of the organic EL display device 1 is formed on the element forming substrate 3. More specifically, a display area 11 including a pixel area and a peripheral area 12 are set on the element forming substrate 3. In the display area 11, a plurality of scanning lines 13 and a plurality of signal lines 14 are wired vertically and horizontally. One subpixel 15 is provided at each intersection of the scanning line 13 and the signal line 14. In the display area 11, a plurality (large number) of sub-pixels 15 are arranged in a matrix. The arrangement direction of the sub-pixels 15 on the element forming substrate 3 is a row direction (vertical direction in the figure) corresponding to the vertical direction on the display screen and a column direction (horizontal direction in the figure) corresponding to the horizontal direction on the display screen. ). Each sub-pixel 15 includes the organic EL element 2 described above. A scanning line driving circuit 16 that scans and drives the scanning lines 13 and a signal line driving circuit 17 that supplies a video signal (that is, an input signal) corresponding to luminance information to the signal lines 14 are disposed in the peripheral region 11. .

<Configuration of pixel circuit>
FIG. 4 is a diagram illustrating a configuration example of a pixel circuit. The pixel circuit 18 is a circuit that controls a current flowing through the organic EL element 2. Here, as an example, the pixel circuit 18 corresponding to one subpixel is configured by using the driving transistor Tr1, the writing transistor Tr2, and the storage capacitor Cs. In the pixel circuit 18, the video signal written from the signal line 14 via the write transistor Tr 2 is held in the holding capacitor Cs by driving the scanning line driving circuit 16, and a current corresponding to the held signal amount is supplied to the drive transistor. The organic EL element 2 is supplied from the Tr1 to the organic EL element 2, and the organic EL element 2 emits light with luminance according to the current value.

  The pixel circuit 18 having the above configuration is formed on the element forming substrate 3 together with the organic EL element 2. For example, as shown in FIG. 5, a pixel circuit 18 is formed on the element forming substrate 3 using a known thin film forming technique, patterning technique, or the like, and an insulating planarizing film 19 covering the pixel circuit 18 is formed. An organic EL element 2 is formed on the substrate. The lower electrode (anode electrode in this embodiment) 4 of the organic EL element 2 is electrically connected to the pixel circuit 18 through the contact portion 20. For example, in the manufacturing process of the organic EL display device 1, the contact portion 20 is flattened so as to reach the pixel circuit 18 after the planarization film 19 is formed on the element forming substrate 3 so as to cover the pixel circuit 18. A connection hole is formed in the chemical film 19, and a conductive material is embedded in the connection hole.

  Note that the configuration of the pixel circuit as described above is merely an example, and the pixel circuit may be configured by providing a capacitive element in the pixel circuit or further providing a plurality of transistors as necessary. Further, a necessary drive circuit may be added to the peripheral region 12 according to the change of the pixel circuit.

<First Embodiment>
FIG. 6 is a schematic plan view showing a pixel layout of the organic EL display device according to the first embodiment of the present invention.

  In FIG. 6, the auxiliary electrode 21 is formed in a rectangular frame shape on the element forming substrate 3, and a plurality of sub-pixels 15 are arranged in a matrix in the frame of the auxiliary electrode 21, that is, in the pixel region. Yes. Here, for convenience of explanation, a total of 25 subpixels 15 are arranged in 5 × 5 columns in the pixel region, the top row being the first row and the leftmost column being the first column.

  The auxiliary electrode 21 is formed simultaneously with the lower electrode 4 on the planarizing film 19. The auxiliary electrode 21 and the lower electrode 4 are formed in the same layer in an electrically insulated state. The auxiliary electrode 21 is electrically connected to the upper electrode (cathode electrode in this embodiment) 7 by a plurality of contact portions 22 provided in a region where the auxiliary electrode 21 is formed.

  Each sub-pixel 15 is provided with one contact portion 20 for electrical connection with the pixel circuit 18. When the lower electrode 4 that defines the planar size (area) of the sub-pixel 15 is formed in a rectangular shape in plan view, the contact portion 20 is formed in a protruding portion 15A that partially protrudes from one side of the rectangle. ing. The reason why the contact portion 20 is formed in the protruding portion 15A of the sub-pixel 15 is as follows.

  That is, when the organic EL element 2 is energized to emit light, the contact portion 20 is not formed in a desired light emitting state. For this reason, normally, the formation site of the contact portion 20 is shielded to be a non-light emitting portion. In such a case, for example, when the region of the sub-pixel 15 is enlarged so as to include the protruding portion 15A and the outer shape of the sub-pixel 15 is rectangular, a part of the rectangle (formation portion of the contact portion 20) becomes a non-light emitting portion. The outer shape of the light emitting pixel becomes an irregular shape such that a part of the rectangle is cut out. On the other hand, if the contact portion 20 is formed in the protruding portion 15A of the sub-pixel 15 as described above, the outer shape of the light-emitting pixel becomes a rectangular shape, which is suitable for image display.

  Here, when the arrangement direction of the sub-pixels 15 is divided into the row direction (vertical direction) and the column direction (horizontal direction), in the pixel layout shown in FIG. 6, the contact portion of the sub-pixels 15 adjacent in the row direction. The position of 20 is arranged in a state inverted (vertically inverted) in the row direction.

  That is, for the first row sub-pixel 15 and the second row sub-pixel 15 that are adjacent in the row direction, the contact portion 20 of the first row sub-pixel 15 is arranged at the lower left of the sub-pixel 15 and the second row. The contact portion 20 of the sub-pixel 15 is disposed on the upper right of the sub-pixel 15. For this reason, in the first row sub-pixel 15 and the second row sub-pixel 15, the positions where the contact portions 20 are provided are inverted in the row direction and also inverted (horizontal inversion) in the column direction.

  For the second row sub-pixel 15 and the third row sub-pixel 15 that are adjacent in the row direction, the contact portion 20 of the second row sub-pixel 15 is arranged at the upper right of the sub-pixel 15 and the third row. The contact portion 20 of the sub-pixel 15 is disposed at the lower left of the sub-pixel 15. For this reason, in each of the sub pixels 15 in the second row and the sub pixels 15 in the third row, the positions where the contact portions 20 are provided are inverted in the row direction and also inverted in the column direction.

  Further, the third row sub-pixel 15 and the fourth row sub-pixel 15 adjacent in the row direction have the same positional relationship as the first row sub-pixel 15 and the second row sub-pixel 15 described above, and the contact portion. As for the sub-pixel 15 in the fourth row and the sub-pixel 15 in the fifth row adjacent to each other in the row direction, the same positional relationship as the sub-pixel 15 in the second row and the sub-pixel 15 in the third row described above is provided. A contact portion 20 is provided.

  Accordingly, the contact portions 20 of the first row and second row sub-pixels 15 are collectively arranged in a region between the first row sub-pixel 15 and the second row sub-pixel 15. The contact portions 20 of the subpixels 15 in the third row and the fourth row are collectively arranged in a region between the subpixels 15 in the third row and the subpixels 15 in the fourth row. On the other hand, the contact portion 20 is not formed in the region between the sub pixel 15 in the second row and the sub pixel 15 in the third row, and the sub pixel 15 in the fourth row and the sub pixel 15 in the fifth row. The contact part 20 is not formed also in the area | region between.

  By adopting such a pixel layout, it is necessary to secure an area for forming the contact portion 20 between the sub-pixel 15 in the first row and the sub-pixel 15 in the second row. It is not necessary to secure a region for forming the contact portion 20 between the sub-pixel 15 of the eye and the sub-pixel 15 of the third row. Similarly, it is necessary to secure an area for forming the contact portion 20 between the sub-pixel 15 in the third row and the sub-pixel 15 in the fourth row. It is not necessary to secure a region for forming the contact portion 20 between the sub-pixels 15 of the eye.

  Therefore, the subpixels 15 in the first and second rows are arranged at the same interval as the subpixels 15 in the third and fourth rows, and the subpixels 15 in the second and third rows are arranged in the fourth row. Are arranged at the same intervals as the sub-pixels 15 in the fifth row. The sub pixels 15 in the second row and the third row are arranged at a smaller interval than the sub pixels 15 in the first row and the second row, and the sub pixels 15 in the fourth row and the fifth row are arranged in the third row. Are arranged at a smaller interval than the sub-pixels 15 in the fourth row.

  Therefore, compared to the conventional pixel layout (see FIG. 20), the sub-pixels 15 can be arranged more densely in the row direction. As a result, the area occupied by the sub-pixel 15 (lower electrode 4) in the pixel region can be increased. For this reason, a high aperture ratio of the pixel can be realized. The increase in the aperture ratio of the pixel contributes to the extension of the lifetime of the organic EL element 2 because the current value (current density) per unit area flowing through each organic EL element 2 can be kept low. Further, when the comparison is made with the same pixel size, more subpixels 15 can be arranged in the pixel region. For this reason, high definition display can be realized.

Second Embodiment
FIG. 7 is a schematic plan view showing a pixel layout of the organic EL display device according to the second embodiment of the present invention.

  The second embodiment is common in that the positions of the contact portions 20 of the sub-pixels 15 adjacent in the row direction are inverted (upside down) in the row direction as compared with the first embodiment. However, the positional relationship between the contact portions 20 of the sub-pixels 15 adjacent in the column direction is different. That is, in the first embodiment, the positions of the contact portions 20 of the sub-pixels 15 adjacent in the column direction are arranged without being inverted in the column direction (that is, the same position of the sub-pixels 15). In the second embodiment, the positions of the contact portions 20 of the sub-pixels 15 adjacent in the column direction are arranged in a reversed state (left-right reversed) in the column direction.

  More specifically, in the second embodiment, the first row, the third row, and the fifth row of the first column with respect to the subpixel 15 of the first column and the subpixel 15 of the second column that are adjacent in the column direction. The contact portions 20 of the sub-pixels 15 arranged in the sub-pixels 15 are arranged at the lower left of the corresponding sub-pixels 15 and are in contact with the sub-pixels 15 arranged in the first row, the third row, and the fifth row in the second column. The unit 20 is arranged at the lower right of the corresponding sub-pixel 15. The contact portions 20 of the sub-pixels 15 arranged in the second and fourth rows of the first column are arranged at the upper right of the corresponding sub-pixels 15 and are arranged in the second and fourth rows of the second column. The contact portions 20 of the sub-pixels 15 arranged in are arranged on the upper left of the corresponding sub-pixels 15.

  Further, with respect to the second column, the sub-pixel 15 and the third sub-pixel 15 which are adjacent in the column direction, the contact portion 20 of the sub-pixel 15 arranged in the first row, the third row and the fifth row in the second column. Are arranged at the lower right of the corresponding sub-pixels 15 and the contact portions 20 of the sub-pixels 15 arranged in the first row, the third row, and the fifth row in the third column correspond to the corresponding sub-pixels. 15 is arranged at the lower left. Further, the contact portions 20 of the sub-pixels 15 arranged in the second and second rows of the second column are arranged at the upper left of the corresponding sub-pixels 15 and are arranged in the second and fourth rows of the third column. The contact portions 20 of the sub-pixels 15 arranged in are arranged at the upper right of the corresponding sub-pixels 15.

  Further, the third column subpixel 15 and the fourth column subpixel 15 that are adjacent in the column direction have the same positional relationship as the first column subpixel 15 and the second column subpixel 15 described above. 20, the sub-pixels 15 in the fourth and fifth columns adjacent in the column direction have the same positional relationship as the sub-pixel 15 in the second column and the sub-pixel 15 in the third column. Is provided.

  Even when such a pixel layout is adopted, the same effect as in the first embodiment can be obtained.

<Third Embodiment>
FIG. 8 is a schematic plan view showing a pixel layout of the organic EL display device according to the third embodiment of the present invention.

  The third embodiment is common in that the position of the contact portion 20 of the sub-pixel 15 adjacent in the row direction is inverted (upside down) in the row direction as compared with the first embodiment. However, the positions of the contact portions 20 in the column direction of the sub-pixels 15 adjacent in the row direction are different.

  That is, in the first embodiment, among the sub-pixels 15 adjacent in the row direction, one sub-pixel 15 has the contact portion 20 arranged close to one end in the column direction, and the other sub-pixel 15 has A contact portion 20 is disposed at the other end in the column direction. In contrast, in the third embodiment, among the sub-pixels 15 adjacent in the row direction, one of the sub-pixels 15 is provided with the contact portion 20 closer to the pixel center side than one end in the column direction. In the other sub-pixel 15, a contact portion 20 is arranged closer to the pixel center side than the other end in the column direction.

  As a result, in the region between the subpixels 15 in the first row and the subpixels 15 in the second row, the contact portions 20 corresponding to the subpixels 15 are arranged at equal intervals in the column direction. Also in the region between the sub-pixel 15 in the third row and the sub-pixel 15 in the fourth row, the contact portions 20 corresponding to the sub-pixels 15 are arranged at equal intervals in the column direction.

  By adopting such a pixel layout, in addition to the same effects as those of the first embodiment, it is possible to ensure the widest spacing between the contact portions 20 in the column direction and improve the manufacturability thereof. The effect is obtained.

<Fourth embodiment>
FIG. 9 is a schematic plan view showing a pixel layout of an organic EL display device according to the fourth embodiment of the present invention.

  In the fourth embodiment, compared to the third embodiment, the contact portions 20 are arranged at equal intervals in the column direction, but the contact portions 20 of the sub-pixels 15 adjacent in the column direction are common. The positional relationship is different. That is, in the third embodiment, the positions of the contact portions 20 of the sub-pixels 15 adjacent in the column direction are arranged without being inverted in the column direction (that is, the same position of the sub-pixels 15). In the fourth embodiment, the positions of the contact portions 20 of the sub-pixels 15 adjacent in the column direction are arranged in an inverted state in the column direction.

  More specifically, in the third embodiment, the first row, the third row, and the fifth row of the first column with respect to the subpixel 15 of the first column and the subpixel 15 of the second column that are adjacent in the column direction. The contact portions 20 of the sub-pixels 15 arranged on the left side are arranged on the left side of the virtual vertical axis passing through the center of the corresponding sub-pixel 15 and are arranged on the first, third, and fifth rows of the second column. The contact portions 20 of the arranged sub-pixels 15 are arranged on the left side of the virtual vertical axis passing through the center of the corresponding sub-pixel 15. Further, the contact portions 20 of the sub-pixels 15 arranged in the second row and the fourth row of the first column are arranged on the right side of the virtual vertical axis passing through the center of the corresponding sub-pixel 15. The contact portions 20 of the sub-pixels 15 arranged in the second and fourth rows are arranged to the right of the virtual vertical axis passing through the center of the corresponding sub-pixel 15.

  Also, the sub-pixel 15 in the second column and the sub-pixel 15 in the third column are provided with contact portions 20 in the same positional relationship as the sub-pixel 15 in the first column and the sub-pixel 15 in the second column. For the sub-pixel 15 in the column and the sub-pixel 15 in the fourth column, the contact portion 20 is provided in the same positional relationship as the sub-pixel 15 in the first column and the sub-pixel 15 in the second column, and the fourth column Also for the sub-pixel 15 and the sub-pixel 15 in the fifth column, the contact portion 20 is provided in the same positional relationship as the sub-pixel 15 in the first column and the sub-pixel 15 in the second column.

  On the other hand, in the fourth embodiment, the first row, the third row, and the fifth row of the first column with respect to the subpixel 15 of the first column and the subpixel 15 of the second column that are adjacent in the column direction. The contact portions 20 of the sub-pixels 15 arranged on the left side are arranged on the left side of the virtual vertical axis passing through the center of the corresponding sub-pixel 15 and are arranged on the first, third, and fifth rows of the second column. The contact portions 20 of the arranged sub-pixels 15 are arranged to the right of the virtual vertical axis passing through the center of the corresponding sub-pixel 15. Further, the contact portions 20 of the sub-pixels 15 arranged in the second row and the fourth row of the first column are arranged on the right side of the virtual vertical axis passing through the center of the corresponding sub-pixel 15. The contact portions 20 of the sub-pixels 15 arranged in the second and fourth rows are arranged to the left of the virtual vertical axis passing through the center of the corresponding sub-pixel 15.

  In addition, with respect to the sub-pixel 15 in the second column and the sub-pixel 15 in the third column that are adjacent in the column direction, the contact portion 20 of the sub-pixel 15 arranged in the first row, the third row, and the fifth row in the second column. Are arranged to the right of the virtual vertical axis passing through the center of the corresponding sub-pixel 15 and the contact portions 20 of the sub-pixels 15 arranged in the first, third, and fifth rows of the third column are These are arranged on the left side of the virtual vertical axis passing through the center of the corresponding sub-pixel 15. Further, the contact portions 20 of the sub-pixels 15 arranged in the second row and the fourth row in the second column are arranged on the left side of the virtual vertical axis passing through the center of the corresponding sub-pixel 15 and are arranged in the third column. The contact portions 20 of the sub-pixels 15 arranged in the second and fourth rows are arranged to the right of the virtual vertical axis passing through the center of the corresponding sub-pixel 15.

  Further, for the sub-pixel 15 in the third column and the sub-pixel 15 in the fourth column, a contact portion 20 is provided in the same positional relationship as the sub-pixel 15 in the first column and the sub-pixel 15 in the second column. For the subpixel 15 in the column and the subpixel 15 in the fifth column, the contact portion 20 is provided in the same positional relationship as the subpixel 15 in the second column and the subpixel 15 in the third column.

  Even when such a pixel layout is adopted, the same effect as in the third embodiment can be obtained.

  As a layout for arranging the contact portions 20 at equal intervals in the column direction, the positions of all the contact portions 20 in one column direction are maintained while maintaining the intervals of the contact portions 20 shown in FIGS. The layout may be shifted to the side or the other side.

<Fifth Embodiment>
FIG. 10 is a schematic plan view showing a pixel layout of an organic EL display device according to the fifth embodiment of the present invention.

  The fifth embodiment is common in that the positions of the contact portions 20 of the sub-pixels 15 adjacent in the row direction are inverted in the row direction as compared with the first embodiment. The positional relationship between the contact portions 20 of the sub-pixels 15 adjacent in the column direction is different. That is, in the first embodiment, the positions of the contact portions 20 of the sub-pixels 15 adjacent in the column direction are arranged without being inverted in both the row direction and the column direction (that is, the same position of the sub-pixels 15). However, in the fifth embodiment, the positions of the contact portions 20 of the sub-pixels 15 adjacent in the column direction are reversed in both the row direction and the column direction.

  That is, in the fifth embodiment, the first row of subpixels 15 and the second row of subpixels 15 that are adjacent in the column direction are arranged in the first row, the third row, and the fifth row. The contact portions 20 of the sub-pixels 15 are arranged at the lower left of the corresponding sub-pixels 15, and the contact portions 20 of the sub-pixels 15 arranged in the first, third, and fifth rows of the second column are , Are arranged at the upper right of the corresponding sub-pixel 15. The contact portions 20 of the sub-pixels 15 arranged in the second and fourth rows of the first column are arranged at the upper right of the corresponding sub-pixels 15 and are arranged in the second and fourth rows of the second column. The contact portions 20 of the sub-pixels 15 arranged in are arranged at the lower left of the corresponding sub-pixels 15.

  Further, with respect to the second column, the sub-pixel 15 and the third sub-pixel 15 which are adjacent in the column direction, the contact portion 20 of the sub-pixel 15 arranged in the first row, the third row and the fifth row in the second column. Are arranged on the upper right side of the corresponding sub-pixels 15 and the contact portions 20 of the sub-pixels 15 arranged in the first row, the third row, and the fifth row in the third column correspond to the corresponding sub-pixels 15. It is arranged in the lower left of. The contact portions 20 of the sub-pixels 15 arranged in the second and second rows of the second column are arranged in the lower left of the corresponding sub-pixels 15 and are arranged in the second and fourth rows of the third column. The contact portions 20 of the sub-pixels 15 arranged in are arranged at the upper right of the corresponding sub-pixels 15.

  Further, the third column subpixel 15 and the fourth column subpixel 15 that are adjacent in the column direction have the same positional relationship as the first column subpixel 15 and the second column subpixel 15 described above. 20, the sub-pixels 15 in the fourth and fifth columns adjacent in the column direction have the same positional relationship as the sub-pixel 15 in the second column and the sub-pixel 15 in the third column. Is provided.

  When such a pixel layout is employed, the following effects can be obtained in addition to the same effects as in the first embodiment. That is, in the first embodiment, as described above, the interval between the sub-pixels 15 in the second row and the third row is narrower than the interval between the sub-pixels 15 in the first row and the second row. Therefore, the color arrangement when the sub-pixels 15 are arranged side by side for each of the RGB colors is, for example, an arrangement as shown in FIG. In this case, a portion where the RGB pixel interval is widened or narrowed in the row direction continuously exists in the column direction over the entire pixel region. For this reason, there exists a possibility that the uniformity (uniformity) of a screen may be impaired.

  On the other hand, in the case of the fifth embodiment, for example, regarding the subpixels 15 in the first column, the subpixels 15 in the first row and the second row, and the subpixels 15 in the third row and the fourth row are included. The second row and third row sub-pixels 15 and the fourth row and fifth row sub-pixels 15 are arranged at relatively small intervals, respectively. Regarding the subpixels 15 in the second column, the subpixels 15 in the second row and the third row, and the subpixels 15 in the fourth row and the sixth row are arranged at relatively wide intervals, respectively. The sub-pixels 15 in the second row and the sub-pixels 15 in the third row and the fourth row are arranged at relatively small intervals. That is, regarding the subpixels 15 adjacent in the column direction, the subpixels 15 in one column and the subpixels 15 in the other column are in a state in which the positions of the subpixels 15 are relatively shifted in the column direction by one row. Has been placed.

  For this reason, the color arrangement when the sub-pixels 15 are arranged side by side for each of the RGB colors is, for example, an arrangement as shown in FIG. In this case, the portion where the RGB pixel interval is widened or narrowed in the row direction does not continue in the column direction in the pixel region, but is uniformly distributed throughout the pixel region. For this reason, the uniformity of the screen is improved.

<Sixth Embodiment>
FIG. 13 is a schematic plan view showing a pixel layout of an organic EL display device according to the sixth embodiment of the present invention.

  The sixth embodiment is common in that the position of the contact portion 20 of the sub-pixel 15 adjacent in the row direction is inverted in the row direction as compared with the second embodiment. The positional relationship between the contact portions 20 of the sub-pixels 15 adjacent in the column direction is different. That is, in the second embodiment, the positions of the contact portions 20 of the sub-pixels 15 adjacent in the column direction are arranged so as not to be inverted in the row direction but in the column direction. In the embodiment, the positions of the contact portions 20 of the sub-pixels 15 adjacent in the column direction are arranged so as not to be inverted in the column direction but in the row direction.

  More specifically, in the sixth embodiment, the first row, the third row, and the fifth row of the first column with respect to the subpixel 15 of the first column and the subpixel 15 of the second column that are adjacent in the column direction. The contact portions 20 of the sub-pixels 15 arranged in the sub-pixels 15 are arranged at the lower left of the corresponding sub-pixels 15 and are in contact with the sub-pixels 15 arranged in the first row, the third row, and the fifth row in the second column. The unit 20 is arranged at the upper left of the corresponding sub-pixel 15. The contact portions 20 of the sub-pixels 15 arranged in the second and fourth rows of the first column are arranged at the upper right of the corresponding sub-pixels 15 and are arranged in the second and fourth rows of the second column. The contact portions 20 of the sub-pixels 15 arranged in the sub-pixels 15 are arranged at the lower right of the corresponding sub-pixels 15.

  Further, with respect to the second column, the sub-pixel 15 and the third sub-pixel 15 which are adjacent in the column direction, the contact portion 20 of the sub-pixel 15 arranged in the first row, the third row and the fifth row in the second column. Are arranged at the upper left of the corresponding sub-pixels 15 and the contact portions 20 of the sub-pixels 15 arranged in the first row, the third row, and the fifth row in the third column correspond to the corresponding sub-pixels 15. It is arranged in the lower left of. Further, the contact portions 20 of the sub-pixels 15 arranged in the second row and the fourth row in the second column are arranged in the lower right of the corresponding sub-pixels 15 and are arranged in the second and fourth rows in the third column. The contact portions 20 of the sub-pixels 15 arranged in the eyes are arranged on the upper right of the corresponding sub-pixels 15.

  Further, the third column subpixel 15 and the fourth column subpixel 15 that are adjacent in the column direction have the same positional relationship as the first column subpixel 15 and the second column subpixel 15 described above. 20, the sub-pixels 15 in the fourth and fifth columns adjacent in the column direction have the same positional relationship as the sub-pixel 15 in the second column and the sub-pixel 15 in the third column. Is provided.

  Even when such a pixel layout is adopted, the same effect as in the fifth embodiment can be obtained.

<Seventh embodiment>
FIG. 14 is a schematic diagram showing a color arrangement of pixels of the organic EL display device according to the seventh embodiment of the present invention. In the seventh embodiment, a unit pixel is configured with three sub-pixels 15 corresponding to RGB as one set, and the unit pixels are arranged in a matrix on the element formation substrate 3. As a component common to each of the above embodiments, the positions of the contact portions 20 of the sub-pixels 15 adjacent in the row direction are arranged in an inverted state in the row direction, and then the contact of the unit pixel adjacent in the column direction. The position of the portion 20 is arranged in a state reversed in the row direction. As a result, the RGB color arrangement is as shown in FIG.

  Also in this case, as in the fifth embodiment and the sixth embodiment described above, the portion where the RGB pixel interval is widened or narrowed in the row direction is not continuous in the column direction in the pixel region, but the entire pixel region. It will be uniformly dispersed. For this reason, the uniformity of the screen is improved.

  In each of the embodiments described above, as a common component, the positions of the contact portions 20 of the sub-pixels 15 adjacent in the row direction are arranged in an inverted state in the row direction. However, the contact portions 20 of the sub-pixels 15 adjacent in the column direction may be arranged in an inverted state in the column direction. That is, in each of the above embodiments, the row direction is described as “first direction” and the column direction is described as “second direction”. However, the present invention is not limited to this, and the row direction is defined as “second direction” and column direction. May be set as the “first direction”.

<Application example>
The organic EL display device 1 having the above configuration is input to various electronic devices shown in FIGS. 15 to 19, for example, electronic devices such as a digital camera, a notebook personal computer, a mobile terminal device such as a mobile phone, and a video camera. The present invention can be applied to electronic devices in various fields that display a video signal or a video signal generated in the electronic device as an image or video.

  FIG. 15 is a perspective view showing a television as a first application example. The television according to this application example includes a video display screen unit 101 including a front panel 102, a filter glass 103, and the like, and the organic EL display device 1 can be applied to the video display screen unit 101.

  16A and 16B are diagrams showing a digital camera as a second application example, in which FIG. 16A is a perspective view seen from the front side, and FIG. 16B is a perspective view seen from the back side. The digital camera according to this application example includes a light emitting unit 111 for flash, a display unit 112, a menu switch 113, a shutter button 114, and the like, and the organic EL display device 1 can be applied to the display unit 112.

  FIG. 17 is a perspective view showing a notebook personal computer as a third application example. The notebook personal computer according to this application example includes a main body 121 that includes a keyboard 122 that is operated when characters and the like are input, a display unit 123 that displays an image, and the like. The display unit 123 includes the organic EL display device 1 described above. Is applicable.

  FIG. 18 is a perspective view showing a video camera as a fourth application example. The video camera according to this application example includes a main body 131, a lens 132 for shooting an object on a side facing forward, a start / stop switch 133 at the time of shooting, a display unit 134, and the like. The EL display device 1 can be applied.

  FIG. 19 is a diagram showing a mobile terminal device, for example, a mobile phone, as a fifth application example, where (A) is a front view in an open state, (B) is a side view thereof, and (C) is in a closed state. (D) is a left side view, (E) is a right side view, (F) is a top view, and (G) is a bottom view. The mobile phone according to this application example includes an upper housing 141, a lower housing 142, a connecting portion (here, a hinge portion) 143, a display 144, a sub-display 145, a picture light 146, a camera 147, and the like. In addition, the organic EL display device 1 described above can be applied to the sub display 145.

It is sectional drawing which shows the structure of the principal part of the display apparatus with which this invention is applied. It is sectional drawing which shows an example of the laminated structure of an organic EL element. It is a figure which shows the structural example of the drive circuit of an organic electroluminescent display apparatus. It is a figure which shows the structural example of a pixel circuit. It is a partial cross section figure of an organic electroluminescence display. 1 is a schematic plan view showing a pixel layout of an organic EL display device according to a first embodiment of the present invention. It is a schematic plan view which shows the layout of the pixel of the organic electroluminescence display which concerns on 2nd Embodiment of this invention. It is a schematic plan view which shows the layout of the pixel of the organic electroluminescence display which concerns on 3rd Embodiment of this invention. It is a schematic plan view which shows the layout of the pixel of the organic electroluminescence display which concerns on 4th Embodiment of this invention. It is a schematic plan view which shows the layout of the pixel of the organic electroluminescence display which concerns on 5th Embodiment of this invention. It is the schematic (the 1) which shows the color arrangement | sequence of the pixel in embodiment of this invention. It is the schematic (the 2) which shows the color arrangement | sequence of the pixel in embodiment of this invention. It is a schematic plan view which shows the layout of the pixel of the organic electroluminescence display which concerns on 6th Embodiment of this invention. It is the schematic which shows the color arrangement | sequence of the pixel of the organic electroluminescence display which concerns on 7th Embodiment of this invention. It is a perspective view which shows the television used as the 1st application example. It is a figure which shows the digital camera used as the 2nd application example. It is a perspective view which shows the notebook personal computer used as the 3rd application example. It is a perspective view which shows the video camera used as the 4th application example. It is a figure which shows the portable terminal device used as the 5th application example. It is a schematic plan view which shows the layout of the pixel in the conventional organic EL display apparatus.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Organic EL display device, 2 ... Organic EL element, 3 ... Element formation substrate, 4 ... Lower electrode, 5 ... Insulating layer, 6 ... Organic layer, 7 ... Upper electrode, 15 ... Subpixel, 18 ... Pixel circuit, 20 ... Contact part

Claims (5)

A plurality of sub-pixels including an electro-optic element and a contact portion for electrically connecting the electro-optic element to a pixel circuit are arranged in a matrix and arranged.
Of the row direction and the column direction, which are the arrangement direction of the sub-pixels, the positions of the contact portions of the sub-pixels adjacent in the first direction are arranged in an inverted state in the first direction. Display device. The contact portions of subpixels adjacent in a second direction different from the first direction among the row direction and the column direction are arranged at equal intervals in the second direction. The display device according to 1. Of the row direction and the column direction, the positions of the contact portions of sub-pixels adjacent in a second direction different from the first direction are arranged in an inverted state in the first direction. The display device according to claim 1. The plurality of sub-pixels constitute a unit pixel with three sub-pixels corresponding to R (red), G (green), and B (blue) as one set,
The plurality of unit pixels are arranged in a matrix,
Of the row direction and the column direction, the positions of the contact portions of the unit pixels adjacent in a second direction different from the first direction are arranged in an inverted state in the first direction. The display device according to claim 1. A plurality of sub-pixels including an electro-optical element and a contact portion for electrically connecting the electro-optical element to a pixel circuit are arranged in a matrix and arranged in a row direction and a column as an arrangement direction of the sub-pixels An electronic device comprising: a display device in which positions of contact portions of sub-pixels adjacent in a first direction among the directions are inverted in the first direction.

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