JP2005189676A - Display device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a display device applied to, e.g. a display device having organic EL elements in which deterioration in picture quality due to the resistance of a wiring pattern is effectively avoided. <P>SOLUTION: The wring pattern 45 formed surrounding a pixel part AR is characterized in that parts 50 and 51 for connection are formed in a nesting state between outer wiring patterns 46A and 46B of the wiring pattern 45 and can be led out to the sides of the outer wiring patterns 46A and 46B through electrodes 42A to 42D for external connection. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a display device, and can be applied to, for example, a display device using an organic EL (Electro Luminescence) element. In the present invention, the wiring pattern formed so as to surround the pixel portion is formed by nesting a connection portion between the wiring pattern and the outer wiring pattern of the wiring pattern. By enabling the extraction by the electrode, image quality deterioration due to the resistance of the wiring pattern can be effectively avoided.

  Conventionally, for organic EL elements, various applications to display devices have been proposed in, for example, USP 5,684,365 and JP-A-8-234683.

  In such a display device 1, as shown in FIG. 4, a pixel unit 3 is formed by arranging pixels 4 in a matrix on a substrate 2 made of glass or the like. The organic EL element 5 is driven by the driving transistor TR2. For this reason, in this display device 1, the transistor TR1 is controlled to be turned on / off, the terminal voltage of the signal level holding capacitor Cs is set according to the signal level of the signal line SIG, and driven by the gate voltage of the signal level holding capacitor Cs. The organic transistor 5 is driven by current by the transistor TR2. In the following, a circuit using a transistor or the like for driving the organic EL element 5 in each pixel is referred to as a pixel circuit.

  Thus, in each pixel 4 by such current driving, the driving current of the organic EL element 5 is supplied from the power source Vcc, and this current flows through the driving transistor TR2 and the organic EL element 5 to be the cathode of the organic EL element 5. The current flows out to the power source Vcathode, and in the wiring pattern of the power source Vcc and the cathode power source Vcathode, the drive current of the organic EL element 5 flows for all the pixels 4 constituting the pixel unit 3. As a result, in the display device 1, a huge current flows through the wiring patterns of the power supply Vcc and the cathode power supply Vcathode, and a voltage drop that cannot be ignored even with a slight wiring resistance occurs in these wiring patterns. .

  On the other hand, in the display device 1 shown in FIG. 4, when the voltages of the power supply Vcc and the cathode power supply Vcathode supplied to the pixel 4 change due to such a voltage drop, the operating point of the organic EL element 5 changes. Therefore, the organic EL element 5 cannot emit light with the desired luminance. Accordingly, in this type of display device, it is required to reduce the resistance of the wiring patterns of the power supply Vcc and the cathode power supply Vcathode as much as possible.

  FIG. 5 is an exploded perspective view showing the configuration of the display device 11 that can reduce the resistance of these wiring patterns. In this display device 11, after a pixel circuit of each pixel, a scanning line and a signal line related to this pixel circuit are formed in an area AR serving as a pixel portion on the glass substrate 12, a planarization film 14 made of an insulating layer, an anode A wiring layer 15 of the layer is formed. In the display device 11, an electrode 16 that connects the driving transistor TR <b> 2 to the anode of the organic EL element 5 is formed by the wiring layer 15 of the anode layer. In the display device 11, after the material layer of the organic EL element 5 is subsequently formed, the wiring pattern 17 of the cathode electrode of the organic EL element 5 and the sealing member are provided.

  In the display device 11 thus formed, the wiring pattern 17 of the cathode electrode is formed of a transparent electrode because it is necessary to transmit and emit the light of the organic EL element 5. This has a drawback that it is difficult to reduce the resistance. On the other hand, on the lower layer side of the planarizing film 14, there is a limit that the resistance can be reduced as compared with the wiring pattern 17 of the cathode electrode by applying the wiring material made of aluminum. On the other hand, the wiring layer 15 of the anode layer is provided on the planarizing film 14 so as to be insulated from the lower wiring pattern, so that the resistance can be reduced relatively easily.

  Thereby, in the display device 11, the wiring pattern 15 of the cathode electrode and the wiring pattern of the power source Vcc are formed using the wiring layer 15 of the anode layer. That is, in the wiring layer 15 of the anode layer, a wide wiring pattern 18 is formed so as to surround a rectangular region serving as a pixel portion, and as shown by a broken line, the wiring pattern 17 around the cathode electrode is surrounded by this wide wiring pattern. 18 is connected. The wiring pattern 18 is connected to cathode pads 20A to 20D which are electrodes for external connection formed so as to protrude from the short side and the opposite two sides of the display device 11, respectively, thereby reducing the resistance. A wiring pattern 17 of the cathode electrode is connected to a cathode power source through a wiring layer 15 of a certain anode layer. The cathode power supply pads 20A to 20D are provided on both ends of both short sides, so that the display device 11 can sufficiently reduce the voltage drop at the connection portion of the pads 20A to 20D. Has been made.

  The anode layer wiring layer 15 is formed with a set of wide wiring patterns 19A and 19B along the upper and lower sides of the wiring pattern 18 related to the cathode electrode wiring pattern 17 and along the long side of the display device 11. Wide wiring patterns 19A and 19B are connected to power supply pads 21A and 21B, 21C and 21D which are electrodes for external connection formed so as to protrude from the upper and lower long sides of the display device 11. Even in the power supply pads 21A and 21B, 21C and 21D, the power supply pads 21A and 21B are provided at both ends of both long sides, respectively. It is made like that.

  In the display device 11, the power source Vcc of the power supply Vcc is made of aluminum in the lower layer of the planarizing film 14 so as to cross the region AR serving as the pixel portion in the vertical direction of the display screen of the display device 11 and for each pixel continuous in the horizontal direction. A wiring pattern 13 relating to the pixel portion is formed. Here, the wiring pattern 13 related to the pixel portion of the power supply Vcc is connected to the wide wiring patterns 22A and 22B extending along the long side of the display device 11 above and below the region AR serving as the pixel portion, As shown, the wiring patterns 22A and 22B are connected to the wide wiring patterns 19A and 19B formed in the wiring layer 15 of the anode layer through a plurality of electrodes 25 formed so as to be continuous in the longitudinal direction. .

  Accordingly, in the display device 11, the wiring layer 15 of the anode layer, which is an intermediate layer, is effectively used to reduce the resistance of the wiring patterns of the power supply Vcc and the cathode power supply Vcathode as much as possible. The substrate 12 is provided with signal line and scanning line pads 24A to 24D inside long side power supply pads 21A to 21D.

However, even when the wiring pattern of the power supply Vcc and the cathode power supply Vcathode is reduced as much as possible by using the wiring layer 15 of the anode layer, the wiring layer 15 of the anode layer itself has a certain resistance value. Therefore, the influence of the voltage drop due to the wiring pattern 18 related to the wiring pattern 17 of the cathode electrode is unavoidable at a portion near the cathode power source pads 20A to 20D and a portion far from the cathode power source pads 20A to 20D. As a result, as shown in FIG. 6, there is a problem that shading occurs in which the luminance level is lowered in the central portion of the screen in the horizontal direction, thereby degrading the image quality.
USP 5,684,365 JP-A-8-234683

  The present invention has been made in consideration of the above points, and an object of the present invention is to propose a display device capable of effectively avoiding image quality deterioration due to resistance of a wiring pattern.

  In order to solve such a problem, in the first aspect of the present invention, a pixel portion in which pixels are arranged in a matrix shape in a substantially rectangular region, and a first wiring pattern layer surrounding the pixel portion are provided. A first wiring pattern connected to each pixel of the pixel portion and provided with electrodes for external connection on two opposing sides, and a second wiring pattern layer different from the first wiring pattern layer Formed by a pair of wiring pattern portions formed so as to extend along two sides different from the two sides, the second wiring pattern connected to each pixel, and the first wiring pattern layer, A pair of wiring pattern portions formed so as to extend along two different sides respectively, and corresponding to the second wiring pattern through a plurality of connection portions formed sequentially in the extending direction. Wiring pattern And a third wiring pattern in which electrodes for external connection are provided on two different sides, respectively, and the first wiring pattern has a first wiring pattern at least at a substantially central portion of two different sides. The connection part is formed so as to be nested with respect to the connection part of the wiring pattern 3, and is formed in a wiring pattern layer different from the first wiring pattern layer through the connection part. It should be connected to the external connection electrode.

  According to a fifth aspect of the present invention, there is provided a pixel portion in which pixels of an organic EL element are arranged in a matrix in a substantially rectangular region, and the first wiring pattern layer so as to surround the pixel portion. 2 facing the first wiring pattern connected to each pixel of the part and provided with the electrodes for external connection on the two opposing sides, and the second wiring pattern layer different from the first wiring pattern layer It is formed by a pair of wiring pattern portions formed so as to extend along two sides different from one side, and is different between the second wiring pattern connected to each pixel and the first wiring pattern layer. The wiring corresponding to the second wiring pattern is formed by a pair of wiring pattern portions formed so as to extend along the two sides, and is sequentially formed in the extending direction through a plurality of connection portions. putter And a third wiring pattern in which electrodes for external connection are provided on two different sides, respectively, and the first wiring pattern is a third wiring pattern at least at a substantially central portion of two different sides. The connection portion is formed so as to be nested with respect to the connection portion of the wiring pattern, and is formed in a wiring pattern layer different from the first wiring pattern layer through the connection portion. It is connected to the electrode for external connection, and the first, second and third wiring patterns are made to be paths for driving current of the organic EL element.

  According to the configuration of claim 1, a pixel portion in which pixels are arranged in a matrix shape in a region having a substantially rectangular shape, and a first wiring pattern layer that surrounds the pixel portion are connected to each pixel of the pixel portion. The first wiring pattern in which electrodes for external connection are provided on two opposing sides and the second wiring pattern layer different from the first wiring pattern layer are different from the two opposing sides. A second wiring pattern formed by a pair of wiring pattern portions formed so as to extend along the sides respectively, and a second wiring pattern connected to each pixel and a first wiring pattern layer along two different sides, respectively. Formed by a pair of wiring pattern portions formed so as to extend, and connected to corresponding wiring pattern portions of the second wiring pattern via a plurality of connecting portions sequentially formed in the extending direction; 2 different sides A third wiring pattern in which electrodes for external connection are provided, and the first wiring pattern is connected to a portion for connection of the third wiring pattern in at least a central portion of two different sides. A connection part is formed so as to be nested, and the connection part is connected to an external connection electrode formed on a wiring pattern layer different from the first wiring pattern layer via the connection part. In this case, the first wiring pattern is formed so as to surround the pixel portion, and the external connection electrodes on the two sides facing each other and the other two sides on the other side through the connection portion by nesting. It can be connected to an external power source or the like from the electrode for external connection. In this case, however, the other two sides are connected by the external connection electrodes on the other two sides, as compared to the connection by the external connection electrodes on the two sides. The resistance value of the wiring pattern up to each pixel due to the wiring pattern on the side along the two sides can be reduced, so that the image quality deterioration due to the resistance of the wiring pattern can be effectively avoided.

  According to a fifth aspect of the present invention, a pixel portion in which pixels of an organic EL element are arranged in a matrix in a region having a substantially rectangular shape, and a first wiring pattern layer so as to surround the pixel portion are provided. Are connected to each pixel of the first wiring pattern having external connection electrodes on two opposing sides, and a second wiring pattern layer that is different from the first wiring pattern layer. A pair of wiring pattern portions formed so as to extend along two sides that are different from the sides, and the second wiring pattern connected to each pixel and the first wiring pattern layer are different from each other. A wiring pattern corresponding to the second wiring pattern is formed by a pair of wiring pattern portions formed so as to extend along the sides and sequentially formed in the extending direction. Part And a third wiring pattern in which electrodes for external connection are provided on two different sides, respectively, and the first wiring pattern has a third wiring at least at a substantially central portion of the two different sides. An external connection formed in a wiring pattern layer different from the first wiring pattern layer through the connection part, wherein the connection part is formed so as to be nested with respect to the pattern connection part If the first, second, and third wiring patterns are connected to the electrodes for the organic EL element and are paths for driving the organic EL element, the first wiring pattern surrounds the pixel portion. Of the organic EL element connected to an external power source from the two externally connected electrodes formed on the opposite side and the other two externally connected electrodes through the connecting part by nesting. A drive current can flow. In this case, on the side along the other two sides, the connection by the external connection electrodes on the other two sides leads to each pixel by the wiring pattern on the side along the other two sides. It is possible to reduce the resistance value of the wiring pattern up to this, thereby effectively avoiding image quality deterioration due to the resistance of the wiring pattern.

  According to the present invention, it is possible to effectively avoid image quality deterioration due to the resistance of the wiring pattern.

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

(1) Configuration of Embodiment FIG. 1 is an exploded perspective view showing a display device according to Embodiment 1 of the present invention in comparison with FIG. In this display device 41, the same components as those of the display device 11 described above with reference to FIG.

  In this display device 41, pixels by organic EL elements are arranged in a matrix in a rectangular area AR on the glass substrate 12, and a pixel portion is formed. Pads 42A to 42D, 43A to 43D, and 44A to The pixel unit is driven via 44D to display a desired image.

  Therefore, in the display device 41, after the pixel circuit of each pixel, the scanning line and the signal line related to this pixel circuit are formed in this rectangular area AR, the planarizing film 14 made of an insulating layer and the wiring layer 15 of the anode layer are formed. The electrode 16 that connects the driving transistor TR2 to the anode of the organic EL element 5 is formed by the wiring layer 15 of the anode layer (FIG. 4). The display device 41 is provided with the wiring pattern 17 of the cathode electrode of the organic EL element 5 and the sealing member after the material layer of the organic EL element 5 is subsequently formed.

  In the display device 41 created as described above, the wiring layer 15 of the anode layer is formed with a wide wiring pattern 45 so as to surround a rectangular region serving as a pixel portion, and as shown by a broken line, the wiring of the cathode electrode is formed. The periphery of the pattern 17 is connected to the wide wiring pattern 45. The wiring pattern 45 is connected to cathode pads 43A to 43D, which are electrodes for external connection formed on the short side and the two opposite sides of the display device 41, respectively, and thereby an anode layer having a low resistance. The wiring pattern 17 of the cathode electrode is connected to the cathode power source through the wiring layer 15. The cathode power supply pads 43A to 43D are respectively provided above and below both short sides, so that in the display device 41, the voltage drop is sufficiently reduced at the connection portion by the pads 43A to 43D. ing.

  Also, the wiring layer 15 of the anode layer is formed with a set of wide wiring patterns 46A and 46B along the upper and lower sides of the wiring pattern 45 related to the wiring pattern 17 of the cathode electrode and along the long side of the display device 41. Wide wiring patterns 46A and 46B are connected to power supply pads 44A and 44B, 44C and 44D, which are external connection electrodes formed on the upper and lower long sides of the display device 41, respectively. Even in the power supply pads 44A and 44B, 44C and 44D, the power supply pads 44A and 44B are provided at both ends of both long sides, respectively, so that in the display device 41, the voltage drop is sufficiently reduced at the connection portions by the pads 44A to 44D. It is made like that.

  The display device 41 has a lower layer of the planarizing film 14 so as to cross the region AR serving as the pixel portion in the vertical direction of the display screen of the display device 41 and for each pixel continuous in the horizontal direction, the power supply Vcc is made of aluminum. A wiring pattern 13 relating to the pixel portion is formed. Here, the wiring pattern 13 related to the pixel portion of the power supply Vcc is connected to the wide wiring patterns 48A and 48B extending along the long side of the display device 41 above and below the region AR serving as the pixel portion, As shown, the wiring patterns 48A and 48B are connected to the wide wiring patterns 46A and 46B formed in the wiring layer 15 of the anode layer through a plurality of electrodes 49 formed so as to be continuous in the longitudinal direction. .

  Thus, in the display device 41, the wide wiring patterns 46A and 46B formed in the wiring layer 15 of the anode layer are connected to the electrodes 50 which are connection portions corresponding to the plurality of electrodes 49 formed in the wiring patterns 48A and 48B. Is formed.

  In the display device 41, the wiring pattern 45 formed so as to surround the pixel portion is enlarged in the portion indicated by the symbols A and B, as shown in FIG. An electrode 51 is formed so as to be nested with the electrode 50, and is connected to pads 42 </ b> A to 42 </ b> D which are terminals for external connection through the electrode 51. In FIG. 2, only the front side portion is shown in FIG. 1, but the rear side portion in FIG. 1 is similarly configured.

  That is, in the wiring patterns 46A and 46B, the electrodes 50 are formed at a predetermined pitch along the inner side. The wiring pattern 45 is formed so as to extend outward between the continuous electrodes 50 at a substantially central portion on the long side, and an electrode 51 is formed at the extended tip, and the wiring patterns 46A and 46B are formed. In FIG. 2, the continuous electrodes 50 at these central portions are connected to each other outside the electrode 51.

  In the display device 41, a wiring pattern 52 is formed in a portion corresponding to the electrode 51 in the wiring pattern layer below the wiring layer 15 of the anode layer, and the electrode 53 formed in the wiring pattern 52 causes the wiring pattern 52 to be indicated by an arrow. In addition, the wiring pattern 52 is connected to the wiring pattern 45. Further, the wiring pattern 52 is connected to the three electrodes inside the signal line and scanning line pads 42 </ b> A to 42 </ b> D, and thereby the wiring pattern 45 formed so as to surround the pixel portion is interposed via the electrode 51. The pads 42A to 42D, which are terminals for external connection, are connected.

  Accordingly, in this embodiment, the wiring pattern 45 is provided in the first wiring pattern layer by the wiring layer of the anode layer so as to surround the pixel portion, and is connected to each pixel of the pixel portion, and on two opposing sides. A first wiring pattern provided with electrodes for external connection is configured. Further, the wiring patterns 48A and 48B are formed on the second wiring pattern layer different from the first wiring pattern layer so as to extend along two sides different from the two opposing sides related to the wiring pattern 45, respectively. A second wiring pattern formed by the paired wiring pattern portions connected to each pixel is formed. The wiring patterns 46A and 46B are formed by a pair of wiring pattern portions formed on the first wiring pattern layer so as to extend along two different sides, respectively, and are sequentially formed in the extending direction. A third wiring line is connected to corresponding wiring pattern portions of the second wiring patterns 48A and 48B via electrodes 50, which are a plurality of connection parts, and electrodes for external connection are provided on two different sides, respectively. A wiring pattern is configured.

(2) Operation of Embodiment In the above-described configuration, in this display device 41, pads 42A to 42D, 43A to 43D, and 44A to 44D formed around are connected to a power source, a drive circuit, etc. Displayed on the screen. That is, in the display device 41, among these pads 42A to 42D, 43A to 43D, and 44A to 44D, the pads 44A to 44D provided at both ends on the long side are allocated for the power supply Vcc, and are also provided on both ends on the short side. The provided pads 43A to 43D are assigned to the cathode, and the gradation of each pixel is set via the remaining signal line and scanning line pads 42A to 42D, and a desired image is displayed.

  In the display device 41, when each pixel is driven in this manner, the power Vcc supplied from the pads 44A to 44D provided at both ends on the long side is supplied to the wiring layer 15 of the anode layer from the pads 44A to 44D. It is supplied to the formed wiring patterns 46A and 46B, and further supplied to the wiring patterns 48A and 48B formed in the lower wiring pattern layer via the electrodes 50 provided on the wiring patterns 46A and 46B. , 48B are supplied to each pixel through a wiring pattern 13 extending in the vertical direction across the pixel portion.

  Further, in this way, the power supply Vcc is supplied to each pixel, and in the display device 41, the driving transistor TR2 (FIG. 4) provided in each pixel is an upper layer by the electrode 16 formed in the wiring layer 15 of the anode layer. The driving current of the organic EL element by the driving transistor TR2 is further combined in the pixel portion by the wiring pattern 17 of the cathode electrode in the upper layer. In the display device 41, the driving current of the organic EL elements collected in the wiring pattern 17 of the cathode electrode is formed in the wiring layer 15 of the anode layer so as to surround the pixel portion from the periphery of the wiring pattern 17 of the cathode electrode. The wiring pattern 45 is guided to the wiring pattern 45 and flows out from the short side cathode pads 43A to 43D connected to the wiring pattern 45. On the outside of the wiring pattern 45, the wiring patterns 46A and 46B for the previous power supply are connected. Is formed.

  As a result, the display device 41 effectively uses the wiring layer 15 of the anode layer having the lowest resistance value among the many wiring pattern layers, thereby reducing the resistance of the drive current path related to the organic EL element and reducing the power consumption. In addition to the reduction, image quality deterioration due to the resistance of the wiring pattern is effectively avoided.

  However, even if the wiring pattern is formed in this way, the wiring pattern 45 relating to the extraction of the cathode electrode is formed so as to surround the pixel portion, and the pads 43A to 43D are formed at both ends on the short side. Thus, in the central part on the long side, a voltage drop due to the resistance value of the wiring pattern cannot be avoided compared to the end part on the long side. A decrease in luminance level due to an increase in cathode voltage is observed.

  In this embodiment, in order to prevent such a phenomenon, the cathode wiring pattern 17 is nested with respect to the electrode 50 of the wiring patterns 46A and 46B related to the power supply at a substantially central portion of both the long sides. An electrode 51 of the wiring pattern 45 is formed, the wiring pattern 45 is connected to the lower wiring pattern 52 through the electrode 51, and is connected to the outside through the electrodes inside the signal line pads 42A to 42D. .

  As a result, in the wiring pattern 45 related to the cathode, in addition to both ends on the short side, the wiring pattern 45 is also drawn from the central part on the long side, and the voltage drop due to the resistance of the wiring pattern in the central part on the long side is reduced. Thereby, in the display device 41, it is possible to effectively avoid the shading in the horizontal direction and obtain a high uniformity image quality, thereby effectively avoiding the image quality deterioration due to the resistance of the wiring pattern. Yes.

(3) Advantages of the embodiment According to the above configuration, the wiring pattern formed so as to surround the pixel portion is formed by nesting a connection portion between the wiring pattern and the outer wiring pattern of the wiring pattern. By allowing the external wiring pattern side to be pulled out by the electrode for external connection, image quality deterioration due to the resistance of the wiring pattern can be effectively avoided.

  In addition, by forming the external connection electrode related to such a lead out at a substantially central portion on the long side, such a voltage drop can be efficiently prevented at a portion where the voltage drop is most severe due to the wiring pattern. Thus, it is possible to efficiently prevent image quality deterioration.

  In addition, the anode layer, which is a prerequisite for such wiring, is formed on a substrate on which wiring patterns 49A and 49B related to the lower power supply are formed via a planarizing film, whereby this anode By reducing the resistance value of the wiring layer of the layer, image quality deterioration due to the resistance value of the wiring pattern can be effectively avoided.

  In particular, since the pixel related to such a wiring pattern is a current-driven light emitting element related to an organic EL element, image quality deterioration due to the resistance value of the wiring pattern can be efficiently avoided.

  FIG. 3 is a plan view showing the display device according to the second embodiment of the present invention in a state where a wiring layer of an anode layer is formed. The display device 61 is formed by forming pixel portions and the like on four substrates 62A, 62B, 62C, and 62D, and combining the assemblies of these four substrates 62A, 62B, 62C, and 62D. The display device 61 is a combination of the four substrates 62A, 62B, 62C, and 62D, and the cathode pads 63A, 63B, 63C, 63D, power supply pads 64A, 64B, 64C, 64D, signal line and scanning line pads 65A, 65B, 65C, 65D are provided.

  The display device 61 is configured such that the inner electrodes of the electrodes for the signal lines and the scanning line pads 65A, 65B, 65C, and 65D are connected by the same connection as that of the display device 41 according to the first embodiment. Is assigned to the electrode for preventing the image quality from being deteriorated due to the resistance value of the wiring pattern related to the power supply.

  Even in the case where a display device is formed by combining a plurality of substrates as in this embodiment, the wiring pattern formed so as to surround the pixel portion is connected to the outer wiring pattern of this wiring pattern. Therefore, image quality deterioration due to the resistance of the wiring pattern can be effectively avoided by forming the portion for nesting and allowing the outer wiring pattern side to be pulled out by the electrode for external connection.

  In the above-described embodiment, the case where the wiring pattern pad related to the cathode and the wiring pattern pad related to the power supply are provided on the short side and the long side respectively, but the present invention is not limited thereto. Conversely, the present invention can be widely applied to the case where the wiring pattern pads related to the cathode and the wiring pattern pads related to the power supply are provided on the long side and the short side, respectively.

  In the above-described embodiment, the case where the wiring pattern side related to the cathode is set to the wiring pattern side surrounding the pixel portion in the wiring layer of the anode layer and the wiring pattern related to the power source is provided outside the wiring pattern has been described. However, the present invention is not limited to this, and conversely, the wiring pattern side related to the power supply is set to the wiring pattern side surrounding the pixel portion, and the wiring pattern related to the cathode is provided outside the wiring pattern. Can be applied.

  In the above-described embodiments, the case where the present invention is applied to a display device using an organic EL element that is a self-luminous element related to current driving has been described. However, the present invention is not limited thereto, and the present invention relates to various current driving. A self-luminous element can be widely applied to a display device, and further to a display device related to voltage driving such as liquid crystal. In such a voltage-driven display device, image quality deterioration such as image fluctuation occurs due to an increase in the resistance value of the wiring pattern, so that the image fluctuation caused by the resistance of the wiring pattern is applied by applying the present invention. It is possible to prevent the image quality deterioration due to.

  The present invention can be applied to a display device using an organic EL element, for example.

It is a disassembled perspective view which shows the display apparatus which concerns on Example 1 of this invention. It is a perspective view which expands and shows the center part of the long side in the display apparatus of FIG. It is a top view which shows the display apparatus which concerns on Example 1 of this invention. It is a connection diagram which shows the display apparatus by the conventional organic EL element. It is a disassembled perspective view which shows the display apparatus which concerns on the structure which reduces the resistance value of a wiring pattern. It is a top view with which it uses for description of shading.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1, 11, 41, 61 ... Display apparatus 2, 12, 62A-62D ... Glass substrate, 3 ... Pixel part, 4 ... Pixel, 13, 17, 18, 19A, 19B, 22A, 22B, 45 , 46A, 46B, 48A, 48B, 49A, 49B, 52... Wiring pattern, 14... Planarization film, 15... Wiring layer, 16, 25, 49, 50, 51, 53. , 21A-21D, 24A-24D, 42A-42D, 43A-43D, 44A-44D, 63A-63D, 64A-64D, 65A-65D ... Pad

Claims (6)

A pixel portion in which pixels are arranged in a matrix in a region having a substantially rectangular shape;
A first wiring pattern provided in a first wiring pattern layer so as to surround the pixel portion, connected to each pixel of the pixel portion, and provided with electrodes for external connection on two opposing sides;
The second wiring pattern layer different from the first wiring pattern layer is formed by a pair of wiring pattern portions formed to extend along two sides different from the two opposite sides, respectively. A second wiring pattern connected to each of the pixels;
The first wiring pattern layer is formed by a pair of wiring pattern portions formed so as to extend along the two different sides, and a plurality of connection portions sequentially formed in the extending direction are provided. A third wiring pattern that is connected to a corresponding wiring pattern portion of the second wiring pattern via the external wiring electrodes on the two different sides,
The first wiring pattern is:
At least in the substantially central part of the two different sides, a connection part is formed so as to be nested with respect to the connection part of the third wiring pattern, and through the connection part, A display device, wherein the display device is connected to an electrode for external connection formed in a wiring pattern layer different from the first wiring pattern layer. The external connection electrode connected to the third wiring pattern is:
Formed on both ends of the two different sides,
The external connection electrodes formed in the different wiring pattern layers connected to the first wiring pattern are:
The display device according to claim 1, wherein the display device is formed at a substantially central portion of the two different sides. The display device according to claim 1, wherein the first wiring pattern layer is formed on a substrate on which the second wiring pattern layer is formed via a planarization film. The pixel is
The display apparatus according to claim 1, further comprising: a light emitting element that operates by a driving current supplied by the first and second wiring patterns. A pixel portion in which pixels of an organic EL element are arranged in a matrix in a region having a substantially rectangular shape;
A first wiring pattern provided in a first wiring pattern layer so as to surround the pixel portion, connected to each pixel of the pixel portion, and provided with electrodes for external connection on two opposing sides;
The second wiring pattern layer different from the first wiring pattern layer is formed by a pair of wiring pattern portions formed to extend along two sides different from the two opposite sides, respectively. A second wiring pattern connected to each of the pixels;
The first wiring pattern layer is formed by a pair of wiring pattern portions formed so as to extend along the two different sides, and a plurality of connection portions sequentially formed in the extending direction are provided. A third wiring pattern that is connected to a corresponding wiring pattern portion of the second wiring pattern via the external wiring electrodes on the two different sides,
The first wiring pattern is:
At least in the substantially central part of the two different sides, a connection part is formed so as to be nested with respect to the connection part of the third wiring pattern, and through the connection part, Connected to an electrode for external connection formed in a wiring pattern layer different from the first wiring pattern layer,
The display device, wherein the first, second, and third wiring patterns are paths for driving current of the organic EL element. The pixel is
The organic EL element, and a pixel circuit that drives the organic EL element,
The second wiring pattern layer is
A wiring pattern layer for forming the pixel circuit on a predetermined substrate;
The first wiring pattern layer is
A wiring pattern layer for connecting the pixel circuit to an anode of the organic EL element;
The display device according to claim 5, wherein a cathode electrode of the organic EL element is connected to each pixel of the pixel unit.

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