JP2009277985A - Display device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a display device better uniforming heat generated in wiring connected to an electrode commonly provided to the element in a display part. <P>SOLUTION: A resistance value per unit length of the wiring provided to a side (a D side) having a largest amount of current flowing in the wiring 5 out of the wiring 5 provided to a plurality of sides of a periphery of the display part 1 is smaller than that of the wiring provided to the other sides. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a display device having a light emitting element in a display portion.

  In recent years, attention has been paid to an active matrix organic EL display device in which EL elements are arranged in a matrix on a substrate having TFTs (thin film transistors). An EL element constituting a pixel has a sandwich structure in which an organic layer is sandwiched between an anode and a cathode, and light emitted from the organic layer is extracted from at least one of the electrodes. For example, when the cathode is an electrode on the light extraction side provided on the side opposite to the substrate, the cathode is made of a transparent conductive material and is formed in common to all EL elements across the EL elements. . Further, the cathode is electrically connected to the panel terminal portion so that the voltage of the cathode can be set.

Since the cathode is a transparent electrode formed in common for all EL elements, there is a problem that a voltage difference occurs in the cathode surface due to the electrical resistance of the cathode, resulting in luminance unevenness of light emission. In Patent Document 1, in order to prevent the voltage applied to the cathode from being reduced, a wiring (common wiring) connected to the cathode through a contact hole is provided around the display pixel region, and the wiring is connected to the terminal portion. (FIG. 4).
JP 2001-102169 A

  The wiring (common wiring) provided around the display region can reduce a voltage difference in the cathode surface by using a low-resistance material. If a low resistance material is used for the wiring, the current flowing through the cathode will be concentrated accordingly.However, since the terminal is generally provided on one side of the display area and the current flows toward the terminal, the current concentration is reduced. The degree varies depending on the position of the terminal in the periphery of the display area. In other words, current is more concentrated on the wiring provided on one side of the terminal than on the wiring provided on the other side.

  In the EL display device disclosed in Patent Document 1, wiring is provided on three sides including a side with a terminal, but the width, thickness, material, and the like are not described, and are provided uniformly in the drawing. It has been. Therefore, current concentrates on the wiring provided on the side where the terminal is located, and heat generation increases. Therefore, even if the voltage unevenness can be reduced, the unevenness of the heat causes unevenness of the element in the display region. The influence on the light emitting element due to such heat generation is particularly remarkable when the light emitting element is an organic EL element.

  In view of the above, an object of the present invention is to provide a display device capable of making the heat generated by the wiring connected to the electrode provided in common to the elements in the display region more uniform.

  This invention is made | formed in view of the said subject, The said objective is achieved by the following structures.

That is, the display device according to the present invention is
A substrate,
A display unit provided on the substrate and formed of a plurality of light emitting elements;
A terminal provided on one side of the display unit around the display unit;
Wiring provided on a plurality of sides of the display unit around the display unit,
Each light emitting element is formed on the thin film transistor provided on the substrate, the first electrode connected to the thin film transistor and provided independently for each light emitting element, and the first electrode. A light emitting layer, and a second electrode formed on the light emitting layer and continuously provided on the plurality of light emitting elements in the display unit across the light emitting elements,
The wiring is a display device connected to the second electrode and the terminal,
Among the wirings provided on the plurality of sides, the resistance value per unit length of the wiring provided on the side having the largest amount of current flowing through the wiring is the unit length of the wiring provided on the other side. It is smaller than the resistance value per unit.

  According to the display device of the present invention, the heat generated in the wiring connected to the electrode provided in common for the elements in the display portion can be made more uniform.

  A display device of the present invention includes a substrate, a display portion provided on the substrate and formed by a plurality of light emitting elements, a terminal provided on one side of the display portion around the display portion, and a display Wiring provided on a plurality of sides of the display portion around the portion. A display part is a part which displays image information with the several light emitting element formed in the display part. Note that the display portion may include an element that does not contribute to display other than the light-emitting element. The periphery of the display unit is a peripheral region (frame region) of the display unit in the display device.

  Each light emitting element formed in the display portion includes a thin film transistor provided on a substrate, a first electrode connected to the thin film transistor, a light emitting layer formed on the first electrode, and a light emitting layer. A second electrode formed on the substrate.

  The 1st electrode is provided independently for every light emitting element, and can apply a different electric current for every light emitting element. On the other hand, the second electrode is provided continuously to the plurality of light emitting elements in the display unit across the light emitting elements. The second electrode is designed to have the same potential in a plurality of light emitting elements, but a potential difference occurs between the central portion and the peripheral portion of the display portion due to the electric resistance of the second electrode. In order to reduce this, wiring connected to the second electrode and the terminal is provided around the display portion.

  In the display device according to the present invention, the resistance value per unit length of the wiring provided on the side having the largest amount of current flowing through the wiring among the wirings provided on the plurality of sides is set on the other side. It is characterized by being smaller than the resistance value per unit length of the provided wiring. Since the amount of current flowing through the wiring increases as it approaches the terminal, the amount of current varies depending on the position on the side, but the amount of current flowing through the wiring in the present invention is the average value of the current values flowing in the longitudinal direction of the wiring. The length is the length in the longitudinal direction of the wiring on each side. The side with the largest amount of current may be a wire provided on one side among wirings provided on a plurality of sides, or a plurality of sides when the current amount is equal on a plurality of sides. Wirings provided in may be used.

  However, it is difficult to measure the amount of current flowing through the wiring in an actual display device. In general, when the terminal is provided near the center on the side, it can be said that the amount of current flowing through the wiring on the side where the terminal is is the largest. In addition, when the terminal is provided near the end on the side, it can be said that the amount of current flowing through the wiring on the side where the terminal is located or the side adjacent to the terminal side with respect to the side where the terminal is located is the largest. Which amount of current is large differs depending on the aspect ratio of the display unit or the way of providing the second wiring (auxiliary wiring) provided in the display unit.

  According to the present invention, the resistance value per unit length of the wiring is made different according to the amount of current flowing through the wiring, so that the heat generated in the wiring connected to the electrode provided in common in the element in the display portion can be made more uniform. can do. Then, the influence on the light emitting element caused by the heat generation is made more uniform, and more uniform display can be performed in the display section for a long time.

  Embodiments of the display device of the present invention will be specifically described below with reference to the drawings.

(First embodiment)
FIG. 1 is a schematic plan view of a display device according to the first embodiment. In FIG. 1, 1 is a display section, 2 is a data line driving circuit, 3 is a scanning line driving circuit, 4 is an input circuit, 5 is a wiring (common wiring), 6 is an adhesive region, and 7 is a terminal.

  The display device shown in FIG. 1 includes a display unit 1 in which a plurality of light emitting elements are arranged in a matrix. Further, the data line driving circuit 2 is configured by a thin film transistor on the same substrate and supplies a data signal to a data line arranged on the B side and connected to each light emitting element, and arranged on the C side and connected to each light emitting element. The scanning line driving circuit 3 supplies a control signal to the scanning lines. A terminal 7 that supplies a video signal, a control signal, or power, and an input circuit 4 that converts the input control signal into an operation level of the display panel are arranged on the D side in this embodiment. Furthermore, the adhesion region 6 provided for bonding and fixing the sealing substrate and the substrate on which the display unit 1 is formed, and the second electrode formed continuously across the plurality of light emitting elements. And a wiring (common wiring) 5 electrically connected to each other.

FIG. 2 shows a current programming pixel circuit configured in the display unit 1. The control signal lines P1 and P2 are controlled by the connected scanning signal line driving circuit, and current data is input from the data signal line I _(data) connected to the data line driving circuit. The first electrode (anode in this embodiment) of the light emitting element is connected to a switching thin film transistor M4 connected to the power supply line Vcc through a current driven thin film transistor M1. In addition, the second electrode (the cathode in this embodiment) connected to the ground potential C _GND is connected in common across a plurality of light emitting elements. The second electrode is electrically connected to the common wiring 5, and the current flowing through the light emitting element flows through the common wiring 5. The pixel circuit configured in the display unit 1 is not limited to the pixel circuit, but can be applied to other current programming pixel circuits and voltage programming pixel circuits that receive data signals as voltages.

Next, the connection between the common wiring 5 and each light emitting element will be described in detail. FIG. 3 is a schematic diagram illustrating a three-dimensional arrangement of the pixel region formed by the light emitting element and the second electrode. In FIG. 3, 9 conceptually shows the light emitting layer divided into light emitting elements, and 10 is the second electrode. In FIG. 2, the first electrode, the light emitting layer, the second electrode, and the ground potential C _GND are included in the pixel circuit. However, the three-dimensional arrangement will be described with reference to FIG. For simplicity, the data line driving circuit 2, the scanning line driving circuit 3, the input circuit 4, the bonding region 6, and the terminal portion 7 are omitted.

  A pixel circuit is formed in the display portion 1 and a first electrode connected to the thin film transistor is formed. A light emitting layer 9 is formed on the first electrode in accordance with the pixel arrangement, and the first electrode and the light emitting layer 9 are joined. Then, the second electrode 10 is formed on the light emitting layer 9. The second electrode 10 is also formed on the common wiring 5 disposed around the display unit 1. At this time, when an insulating layer is formed on the common wiring 5, a contact hole (not shown) is formed so that the surface of the common wiring 5 is exposed. In this case, it is not necessary to connect the second electrode 10 and the common wiring 5 via the contact holes on all sides. In this way, the second electrode 10 and the common wiring 5 are electrically connected, and the second electrode is grounded. Note that the electrical connection between the second electrode and the common wiring 5 need not be connected on all sides. Further, either the first electrode or the second electrode may be a cathode and may be an anode.

  The light emitting layer 9 constituting the light emitting element may be an organic EL material or an inorganic EL material. In the case of an organic EL material, the influence due to the heat generation of the wiring is remarkable, and thus a device for making the heat generation in the wiring uniform is particularly required. When the light-emitting element is an organic EL element, in addition to the light-emitting layer that is an organic EL material, a carrier transport layer such as an electron transport layer or a hole transport layer, an electron injection layer, a hole injection layer, or the like The carrier injection layer may be provided.

  The light emitted from the light emitting layer 9 constituting the light emitting element may be extracted to the outside via either the first electrode or the second electrode. In general, in order to integrate circuit elements constituting a pixel circuit such as a thin film transistor provided on a substrate at a high density, it is preferable to adopt a configuration in which light is extracted from the second electrode (top emission configuration). In this configuration, the second electrode is formed of a transparent conductive material such as ITO or IZO, or a metal thin film (Al, Ag, Pt, etc.) having a thickness of about several nm to 30 nm that is thin enough to transmit light. Since the second electrode has a relatively large resistance, a potential difference occurs between the plurality of light emitting elements formed in the display unit 1. In order to reduce this, common wiring 5 is formed on a plurality of sides around the display portion.

  Next, the arrangement of the common wiring 5 will be described.

The current that flows between the anode and the cathode of each light emitting element flows in the order of the second electrode (cathode) formed continuously across the plurality of light emitting elements, the common wiring 5, and the terminal 7. . The terminal 7 is provided near the center of the D side. That is, in the present embodiment, the current flowing through the plurality of light emitting elements in the display unit 1 is concentrated on the common wiring 5 on the D side toward the terminal 7, so the amount of current flowing through the common wiring on the D side is the largest. In many cases, it is larger than the amount of current flowing through the common wiring of other sides, that is, the A side, B side, and C side. Therefore, as for the resistance value per unit length of the common wiring, the D side is smaller than the A side, the B side, and the C side. In the common wiring of the A side, the B side, and the C side, the amount of current flowing through the A side and the C side is the same, and the amount of current flowing through the B side is the smallest. That is, the relationship of the current amount I flowing through the common wiring on each side is I _D > I _A = I _C > I _B.

  Specifically, there are various methods for varying the resistance value per unit length of the common wiring depending on the side. For example, there is a method of varying the width and thickness of the common wiring and the resistivity of the wiring material. . Making the width of the common wiring different means that the width of the wiring provided on the side where the amount of current flowing through the wiring is the largest is wider than the width of the wiring provided on the other side. Also, different thickness of the common wiring means that the thickness of the wiring provided on the side where the amount of current flowing through the wiring is the largest is made larger than the thickness of the wiring provided on the other side. Differentiating the resistivity of the wiring material means that the resistivity of the wiring material provided on the side where the amount of current flowing through the wiring is the largest is higher than the resistivity of the wiring material provided on the other side. To lower. Alternatively, a plurality of common wiring widths, thicknesses, wiring material resistivity, and the like may be varied.

  FIG. 1 is an example in which the width of the common wiring on the D side is wider than the width of the common wiring on the A side, the B side, and the C side. In such a configuration in which the resistance value per unit length varies depending on the width of the wiring, the width of the common wiring on the side where the amount of current flowing through the wiring is relatively small may not be increased more than necessary. The width of the peripheral area (frame area) can be reduced. When a display device is mounted on a portable electronic device such as a mobile phone or a compact camera, it is particularly necessary to reduce the frame. In addition, a narrow frame of the display device can be achieved. In addition, since the formation of the common wiring can be performed by changing the patterning region, the formation process does not increase the process load compared to the conventional configuration. In the example of FIG. 1, the thickness of the common wiring and the material resistivity are the same on both sides.

  Also, in the configuration in which the resistance value per unit length varies depending on the thickness of the wiring, the resistance value per unit length can be varied without changing the width of the wiring. The width of the (D side) wiring can also be reduced. Therefore, the frame area can be further narrowed. In the case where the thickness of the wiring varies depending on the side, if another conductive layer is formed only on the side where the thickness is increased, the wiring can be formed by a simpler process. In this case, the number of wiring layers provided on the side having the largest amount of current flowing through the wiring is larger than the number of wiring layers provided on the other side.

  Even if the resistance value per unit length varies depending on the resistivity of the wiring material, the resistance value per unit length can be varied without changing the width of the wiring. The width of the wiring on the side (side D) can also be reduced. Therefore, the frame region can be narrowed similarly to the configuration in which the resistance value per unit length varies depending on the thickness of the wiring.

In the example shown in FIG. 1, the widths of the wirings on the A side, the B side, and the C side are the same, and the resistance values per unit length are the same, but provided on the side where the amount of current flowing through the wiring is large. It is preferable that the resistance value per unit length becomes smaller as the wiring is provided. In this way, the heat generation of the wiring on each side can be made more uniform. For example, when the resistance value is varied depending on the width of the wiring, it is preferable that the wiring width on the D side is the largest, the A side and the C side are the same width, and the wiring width is reduced in the order of the B side. . That is, the relationship of the wiring width d is d _D > d _A = d _C > d _B.

  In the display device according to the present invention, the common wiring and the second electrode may be connected by forming the second electrode directly on the wiring as described above, or between the common wiring and the second electrode. May be provided with another component such as an insulating layer and connected through a contact hole provided in the other component. In any configuration, it is preferable that the contact area between the common wiring provided on the side where the amount of current flowing through the wiring is the largest and the second electrode is large in order to smoothly perform the current. That is, the contact area with the second electrode in the wiring provided on the side where the amount of current flowing through the wiring is the largest is preferably larger than the contact area with the second electrode in the wiring provided on the other side. .

  In this embodiment, although the potential difference between the plurality of light emitting elements in the display portion can be reduced by the common wiring 5 formed around the display portion, the potential difference is not sufficiently reduced when the resistance of the second electrode is large. In some cases. In this case, it is preferable to provide the second wiring 8 (auxiliary wiring) between the plurality of light emitting elements in the display unit 1 as shown in FIG. By providing the second wiring 8, heat generated by the common wiring 5 and the second wiring 8 can be made more uniform near the center and the periphery in the display unit 1. Since the amount of current flowing through the auxiliary wiring 8 is smaller than the amount of current flowing through the common wiring 5, the width of the second wiring 8 is preferably narrower than the width of the common wiring 5.

  The auxiliary wiring 8 formed in the display unit 1 can be disposed so as to connect, for example, a side where the terminal 7 is formed and a side facing the side as shown in FIG. Further, the arrangement of the auxiliary wiring 8 is not limited to the configuration shown in FIG. 4A, and may be configured as shown in FIGS. 4B to 4F. In any configuration, it is possible to achieve soaking in the vicinity of the center and the periphery in the display unit 1. Further, the auxiliary wiring 8 may be formed only in a part in the display unit 1.

  When the auxiliary wiring 8 is provided in the display unit 1 as described above, the amount of current flowing through the common wiring 5 on each side around the display unit is slightly increased or decreased, but the terminal shown in FIG. The fact that the amount of current flowing through the wiring on the side is the largest remains unchanged.

  In the display device according to the present invention, one of the data line driving circuit and the scanning line driving circuit is provided on the opposite side of the side where the terminal is formed as shown in FIG. 1, and the other is formed with the terminal. It is preferable to be provided on a side adjacent to the side. The data line and the scanning line are preferably arranged in a direction crossing each other. However, if either one is provided on the side where the terminal 7 is formed, the width of the common wiring 5 or the common wiring and the terminal is set. This is because the length of the wiring to be connected (connection wiring) needs to be increased by the width of the drive circuit, so that the amount of heat generation increases.

  Further, in the present embodiment, the data line driving circuit 2, the scanning signal line driving circuit 3, and the input circuit 4 are shown as thin film transistors on the same substrate. However, other structures may be used. For example, each circuit function may be realized by a driver IC configured on single crystal Si, and a signal may be input from the outside of the display device through a terminal portion. Furthermore, a driver IC may be mounted on a substrate like a COG to realize each circuit function on the substrate. In this case, if the driver IC is arranged in the space beside the terminal portion 7 on the A side, the data line driving circuit 2 on the B side and the scanning line driving circuit 3 on the C side can be deleted, and the frame size of the display device is further increased. Can be reduced.

(Second Embodiment)
5 and 6 are schematic plan views of the display device according to the second embodiment. Specifically, differences from the first embodiment will be described.

  In the first embodiment, the common wiring 5 is provided on the four sides around the display unit 1. However, in the present embodiment, the common wiring 5 is provided on all four sides around the display unit 1. Are not formed and are not provided on some sides.

  In the example of FIG. 5, around the display unit 1, the common wiring 5 is provided on three sides, that is, the side where the terminal 7 is located (D side) and the two sides (A side and C side) adjacent to both sides. At this time, the side where the amount of current flowing through the wiring 5 is the largest is the side (D side) where the terminal 7 is provided, as in the first embodiment.

  On the other hand, in the example of FIG. 6, the common wiring 5 is provided on the periphery of the display unit 1 on two sides, that is, the side where the terminal 7 is (D side) and the one side (A side) adjacent to the side. At this time as well, the side with the largest amount of current flowing through the wiring 5 is the side (D side) where the terminal 7 is provided, as in the first embodiment.

  Even when there is a side where no common wiring is provided as described above, when the amount of flowing current is very small as in the case where the wiring is provided on the B side, the display unit 1 has a larger amount than the case where all the four sides are provided. The potential difference of the second electrode in the plurality of light emitting elements is almost unchanged. The frame area can be further narrowed by not providing the common wiring. Further, by providing auxiliary wiring in the display unit 1, the potential difference between the second electrodes can be reduced.

  In the example of FIGS. 5 and 6, the resistance value per unit length of the wiring is varied depending on the width of the wiring. However, in this embodiment as well, as in the first embodiment, the thickness of the wiring, The resistance value can be varied by various methods such as the resistivity of the wiring.

(Third embodiment)
FIG. 7 is a schematic plan view of a display device according to the third embodiment. Specifically, differences from the first embodiment will be described.

  In the first embodiment, the terminal 7 is provided on the long side with respect to the rectangular display unit 1. However, in the present embodiment, the terminal 7 is provided on the short side with respect to the rectangular display unit 1. It is the structure provided in. Even in the case where the terminal 7 is formed on the short side in this way, the side having the largest amount of current flowing through the wiring 5 is the side where the terminal 7 is provided as in the first embodiment (A Side).

  Therefore, by making the resistance value per unit length of the wiring on the A side smaller than the resistance value per unit length of the wiring provided on the other side, an effect equivalent to that of the first embodiment can be obtained. Obtainable.

  Similarly to the first embodiment, a second wiring (auxiliary wiring) can be provided between a plurality of light emitting elements in the display unit 1 as shown in FIG.

  When the display device is mounted on a portable electronic device such as a mobile phone or a compact camera, the display unit is required to have a narrow frame in the longitudinal direction, and the external connection terminals connected to the outside of the panel must be arranged in the short direction. There are many. Therefore, in the present embodiment, it is effective to provide the terminal 7 on the short side with respect to the rectangular display unit 1.

  In the example of FIG. 7, the resistance value per unit length of the wiring is varied depending on the width of the wiring. However, in this embodiment as well, the thickness of the wiring and the resistance of the wiring are the same as in the first embodiment. The resistance value can be varied by various methods such as rate.

(Fourth embodiment)
9 and 10 are schematic plan views of a display device according to the fourth embodiment. Specifically, differences from the second embodiment will be described.

  In the second embodiment, the terminal 7 is provided on the long side with respect to the rectangular display unit 1. However, in the present embodiment, the terminal 7 is provided on the short side with respect to the rectangular display unit 1. It is the structure provided in. Even in the case where the terminal 7 is formed on the short side in this way, the side having the largest amount of current flowing through the wiring 5 is the side where the terminal 7 is provided as in the first embodiment (A Side).

  Therefore, by making the resistance value per unit length of the wiring on the A side smaller than the resistance value per unit length of the wiring provided on the other side, an effect equivalent to that of the second embodiment can be obtained. Obtainable.

  In the example of FIGS. 9 and 10, the resistance value per unit length of the wiring is varied depending on the width of the wiring. However, in this embodiment as well, the thickness of the wiring, The resistance value can be varied by various methods such as the resistivity of the wiring.

(Fifth embodiment)
FIG. 11 is a schematic plan view of a display device according to the fifth embodiment. Specifically, differences from the first embodiment will be described.

  Compared with the first embodiment, in the present embodiment, the position of the terminal portion 7 arranged on the A side is closer to the D side. Especially, the terminal connected to the common wiring 5 is the structure arrange | positioned in the position nearest to the common wiring 5 arrange | positioned at D side.

In this case, the side with the largest amount of current flowing through the wiring 5 is the side (D side) adjacent to the side where the terminal 7 is provided on the terminal side. Although the current amount of the wiring on the A side where the terminal is provided is larger than that on the B side and the C side, the wiring on the D side is longer than the wiring on the A side. Therefore, the wiring on the D side has a larger amount of current than the wiring on the A side. That is, the relationship of the current amount I flowing through the common wiring on each side is I _D > I _A > I _B , I _C.

  Thus, by reducing the resistance value of the side with the largest amount of current, it is not necessary to unnecessarily widen the width of the common wiring on the side with a relatively small amount of current flowing through the wiring. The width of the peripheral area (frame area) of the display unit can be reduced.

  In the example of FIG. 11, the resistance value per unit length of the wiring is varied depending on the width of the wiring. However, in this embodiment as well, the thickness of the wiring and the resistance of the wiring are the same as in the first embodiment. The resistance value can be varied by various methods such as rate.

  Also in the present embodiment, similar to the first embodiment, the object of the present invention can be achieved even in a configuration in which the common wiring 5 is not provided on a part of the side and a configuration in combination with the layout pattern of the auxiliary wiring.

(Sixth embodiment)
FIG. 12 is a schematic view of a display device according to the sixth embodiment. Specifically, differences from the first embodiment will be described.

  Compared to the first embodiment, the common wiring is provided on three sides excluding the C side, and the position of the terminal portion 7 arranged on the A side is closer to the D side. Especially, the terminal connected to the common wiring 5 is the structure arrange | positioned in the position nearest to the common wiring 5 arrange | positioned at D side.

In this case, the side with the largest amount of current flowing through the wiring 5 is the side (D side) adjacent to the side where the terminal 7 is provided on the terminal side. The amount of current in the wiring on the A side where the terminal is provided is larger than that on the B side, but the wiring on the D side is longer than the wiring on the A side, so that more current is collected. The amount of current is larger in the D side wiring than in the A side wiring. That is, the relationship of the amount of current I flowing through the common wiring of each side is I _D > I _A > I _B.

  Thus, by reducing the resistance value of the side with the largest amount of current, it is not necessary to unnecessarily widen the width of the common wiring on the side with a relatively small amount of current flowing through the wiring. The width of the peripheral area (frame area) of the display unit can be reduced.

In the example shown in FIG. 12, the widths of the wirings on the A side and the B side are the same, the resistance values per unit length are the same, but the wirings provided on the side where the amount of current flowing through the wiring is large It is preferable to make the resistance value per unit length smaller. In this way, the heat generation of the wiring on each side can be made more uniform. For example, when the resistance value varies depending on the width of the wiring, it is preferable that the wiring width on the D side is the widest and the wiring width is narrowed in the order of the A side and the B side. That is, the relationship of the wiring width d is d _D > d _A > d _B.

  In the example of FIG. 12, the resistance value per unit length of the wiring is varied depending on the width of the wiring. However, in the present embodiment, the thickness of the wiring and the resistance of the wiring are the same as in the first embodiment. The resistance value can be varied by various methods such as rate.

  Also in the present embodiment, similar to the first embodiment, the object of the present invention can be achieved even in a configuration in which the common wiring 5 is not provided on a part of the side and a configuration in combination with the layout pattern of the auxiliary wiring.

(Seventh embodiment)
An information display device can be configured using the display devices of the first to sixth embodiments. This information display device takes any form of a mobile phone, a mobile computer, a digital still camera, a video camera, a television receiver, a portable music playback device, a navigation system, and a PC monitor. Alternatively, it is a device that realizes a plurality of these functions.

  FIG. 13 is a block diagram of an example of a digital still camera system. Reference numeral 11 denotes a digital still camera system, 12 denotes a photographing unit, 13 denotes a video signal processing circuit, 14 denotes a display device, 15 denotes a memory, 16 denotes a CPU, and 17 denotes an operation unit. A video image captured by the imaging unit 12 or a video image recorded in the memory 15 can be signal-processed by the video signal processing circuit 11 and viewed on the display panel 12. The CPU 16 controls the photographing unit 12, the memory 15, the video signal processing circuit 13, and the like by input from the operation unit 15, and performs photographing, recording, reproduction, and display suitable for the situation. In addition, the display device 14 can be used as a display unit of various electronic devices.

  In each of the first to seventh embodiments, the display device using an EL element has been described as an example. However, the present invention is not limited to this. For example, a plasma display panel (PDP) or a field emission display (FED) is used. The present invention can be applied to current-driven display devices such as the above.

1 is a schematic plan view illustrating an example of a display device according to a first embodiment of the present invention. FIG. 6 illustrates an example of a current setting type pixel circuit including a light-emitting element. The conceptual diagram explaining the three-dimensional arrangement | positioning of a light emitting element and a 2nd electrode. FIG. 3 is a schematic plan view showing an example having auxiliary wiring in the display device according to the first embodiment of the present invention. The plane schematic diagram which shows an example of the display apparatus which concerns on the 2nd Embodiment of this invention. FIG. 10 is a schematic plan view showing another example of the display device according to the second embodiment of the present invention. The plane schematic diagram which shows an example of the display apparatus which concerns on the 3rd Embodiment of this invention. FIG. 9 is a schematic plan view showing an example having auxiliary wiring in a display device according to a third embodiment of the present invention. The plane schematic diagram which shows an example of the display apparatus which concerns on the 4th Embodiment of this invention. The schematic plan view showing another example of the display device according to the fourth embodiment of the present invention. The plane schematic diagram which shows an example of the display apparatus which concerns on the 5th Embodiment of this invention. The plane schematic diagram which shows an example of the display apparatus which concerns on the 6th Embodiment of this invention. The block diagram which shows the whole structure of the digital still camera system which concerns on the 7th Embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Display part 2 Data line drive circuit 3 Scan line drive circuit 4 Input circuit 5 Common wiring 6 Adhesion area | region 7 Terminal 8 Auxiliary wiring 9 Light emitting layer 10 2nd electrode 11 Digital still camera system 12 Image pick-up part 13 Image | video signal processing circuit 14 Display apparatus 15 Memory 16 CPU
17 Operation unit

Claims (11)

A substrate,
A display unit provided on the substrate and formed of a plurality of light emitting elements;
A terminal provided on one side of the display unit around the display unit;
Wiring provided on a plurality of sides of the display unit around the display unit,
Each light emitting element is formed on the thin film transistor provided on the substrate, the first electrode connected to the thin film transistor and provided independently for each light emitting element, and the first electrode. A light emitting layer, and a second electrode formed on the light emitting layer and continuously provided on the plurality of light emitting elements in the display unit across the light emitting elements,
In the display device in which the wiring is connected to the second electrode and the terminal,
Among the wirings provided on the plurality of sides, the resistance value per unit length of the wiring provided on the side having the largest amount of current flowing through the wiring is the unit length of the wiring provided on the other side. A display device characterized by having a resistance value smaller than that per unit.   The display device according to claim 1, wherein the side having the largest amount of current flowing through the wiring is a side where the terminal is provided.   3. The display according to claim 1, wherein a width of a wiring provided on a side having the largest amount of current flowing through the wiring is wider than a width of a wiring provided on another side. apparatus.   The thickness of the wiring provided in the side where the amount of current flowing through the wiring is the largest is thicker than the thickness of the wiring provided in the other side. The display device according to item.   5. The display device according to claim 4, wherein the number of wiring layers provided on the side having the largest amount of current flowing through the wiring is greater than the number of wiring layers provided on the other side.   The resistivity of the wiring material provided on the side having the largest amount of current flowing through the wiring is lower than the resistivity of the wiring material provided on the other side. Item 6. The display device according to any one of Item 5.   The contact area with the second electrode in the wiring provided on the side having the largest amount of current flowing through the wiring is larger than the contact area with the second electrode in the wiring provided on the other side. The display device according to claim 1, wherein the display device is a display device. A second wiring formed between the plurality of light emitting elements in the display unit;
The display device according to claim 1, wherein a width of the second wiring is narrower than a width of a wiring formed around the display portion.   9. The display device according to claim 1, wherein a resistance value per unit length is smaller in a wiring provided on a side having a larger amount of current flowing through the wiring.   The display device according to claim 1, wherein the light emitting element is an organic EL element. A substrate,
A display unit provided on the substrate and formed of a plurality of light emitting elements;
A terminal provided on one side of the display unit around the display unit;
Wiring provided on a plurality of sides of the display unit around the display unit,
Each light emitting element is formed on the thin film transistor provided on the substrate, the first electrode connected to the thin film transistor and provided independently for each light emitting element, and the first electrode. A light emitting layer, and a second electrode formed on the light emitting layer and continuously provided on the plurality of light emitting elements in the display unit across the light emitting elements,
In the display device in which the wiring is connected to the second electrode and the terminal,
Among the wirings provided on the plurality of sides, the resistance value per unit length of the wiring provided on the side where the terminal is provided is the unit length of the wiring provided on the other side. A display device characterized by having a resistance value smaller than the per unit resistance.

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