JP2007164162A - Display device and camera - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To suppress potential fluctuation due to increases in wiring resistance and necessary current amount caused by the extension of wiring length due to increases in size and resolution of a display area. <P>SOLUTION: A display area 6 in which EL devices and pixel circuits are disposed on a substrate 10 is formed. Each EL device is disposed between a lower pixel electrode and an upper transparent electrode on the substrate and the pixel electrode is electrically connected to a power supply line 1 through the pixel circuit. The transparent electrode is electrically connected to a common potential line through a contact hole. The power supply line and the common potential line are arranged in parallel to each other at the periphery of a display area. The power supply line is divided and disposed on both the sides of the contact hole, or the power supply line is disposed on one side of the contact hole and the common potential line is disposed on the other side of the contact hole so as to be extended wider than the width of the contact hole. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a display device and a camera, and in particular, a plurality of unit pixels each including a current-driven light-emitting element and a pixel circuit (also referred to as a drive circuit) for controlling a drive current of the light-emitting element are arranged on a substrate. The present invention relates to a display device having a display area. The present invention is particularly suitable for a display device in which electroluminescence (EL) elements that emit light when a current is passed are arranged in a matrix.

  In recent years, display devices using electroluminescence (EL) elements have attracted attention as display devices that replace CRTs and LCDs. Among them, organic EL elements, which are current-driven light-emitting elements whose emission luminance is controlled by the current flowing through the elements, are known. Application development is active.

  A display device in which a display region is configured by arranging a plurality of pixels including an organic EL element and a thin film transistor (TFT) serving as a control element for controlling a current flowing through the organic EL element has been studied. In addition, in an organic EL display device including a peripheral circuit, a thin film transistor (TFT) is used not only in the display area but also in the peripheral circuit.

  In recent display devices, the display area has been increased in area and definition, and the number of lines such as signal lines and scanning lines and the length of the lines have increased, and the power for flowing current to each pixel in the display area. The lengths of the supply lines and common potential lines are also increasing.

  As the wiring length becomes longer, the wiring resistance increases. In addition, the amount of current flowing through the display device increases as the display device increases in area and definition. As the wiring resistance and the amount of current increase, the influence of the potential drop along the wiring increases, and there is a problem that a constant power supply potential cannot be supplied to the entire display region, resulting in a deterioration in display quality.

  As means for solving the above problems, the width of the power supply wiring connecting the external connection terminal and the display area is widened to reduce the wiring resistance, and further, a wide contact hole is formed to reduce the contact resistance between the power supply wiring and the pixel electrode. Patent Document 1 discloses a technique for reducing and suppressing the potential drop. However, when the power supply wiring width is increased and the contact hole is enlarged, the area around the display area, that is, the so-called frame area is increased. Depending on the application product, it is required to make the frame as small as possible, so there is a limit to increasing the wiring width and contact hole size.

  In the organic EL display device, when moisture enters the organic EL element, an area that does not emit light (dark spot) is generated, and a problem of deterioration in luminance occurs. Therefore, a sealing technique for suppressing intrusion of moisture is required. Patent Document 2 discloses a technique for blocking moisture by surrounding a pixel region in a plane with a moisture blocking structure made of an inorganic material.

  Further, in order to protect the EL element from the outside air containing moisture, the entire display portion is covered with a passivation film that does not allow moisture to pass therethrough. In order to suppress the passage of moisture, it is desirable that the passivation film has a certain thickness or more. As a result, the display area can block moisture intrusion from the thickness direction.

  Moisture penetration also occurs from the surface direction. This penetrates mainly through a film that easily absorbs moisture among the films constituting the display device. In particular, since the planarization film formed in the lower layer of the organic EL element is formed of an organic compound such as an acrylic resin, it easily allows moisture to pass therethrough.

  Patent Document 3 discloses an invention in which a contact hole for connecting a power supply wiring and an electrode of a display element is provided in a peripheral region, thereby separating a planarizing film in the display region and a planarizing film outside thereof. ing. Moisture that has entered the outer planarization film is blocked by the contact portion and cannot enter the inner planarization film. Thereby, the horizontal water penetration | invasion is suppressed. By enclosing the display area with the contact hole, it is possible to largely block moisture intrusion into the display area from the lateral direction.

  Not only the method of dividing the planarization film by the contact hole but also a means for suppressing moisture intrusion in the lateral direction is provided in the contact hole portion, the passivation film is at least vertically above the contact hole in the same vertical direction as the display area. It must be thick enough to block directional moisture ingress.

  Since the passivation film is usually formed by printing or mask film formation, the thickness is gradually reduced within a certain range up to the end. For this reason, in order to have a predetermined thickness on the contact hole, the thickness is gradually reduced from the outside of the contact hole to the substrate end or the inner edge of the sealing cap bonding region. A certain predetermined distance is determined.

  On the other hand, since the organic EL layer is also formed by mask film formation, the position may be shifted. It is required to secure a certain distance between the outer edge of the display area and the inner edge of the contact hole so as to absorb this and prevent the organic EL layer from contacting the contact hole.

Thus, the contact holes must be arranged with a certain distance between the substrate edge and the outer edge of the display area. This restriction is also an obstacle to reducing the frame.
US Pat. No. 6,690,110 JP 2005-158292 A JP 2006-0666206 A

  According to the present invention, fluctuations in the power supply potential caused by an increase in the wiring length accompanying the enlargement of the display area, an increase in the wiring resistance as a result, and an increase in the amount of current necessary for high definition are increased. It suppresses without doing.

In the display device of the present invention, a light-emitting element and a driving circuit that is provided in a lower layer of the light-emitting element via an insulating layer and controls a current flowing through the light-emitting element are arranged in a row direction and a column direction, respectively. Arranged and arranged
The light emitting element is provided on the insulating layer covering the driving circuit, between the lower first electrode and the upper second electrode,
The first electrode is connected to a first power supply wiring disposed around a region where the light emitting element and the driving circuit are disposed on the substrate via the driving circuit,
The second electrode is a display device that is connected to a second power supply line through a contact hole that surrounds the region and is opened in the insulating layer,
The first power supply wiring disposed on one side of the contact hole and the first power supply wiring or the second power supply wiring disposed on the opposite side of the contact hole along at least one side of the substrate The widened portion is arranged in parallel.

In the display device of the present invention, a display region in which a plurality of light emitting elements and a driving circuit for controlling the driving current of the light emitting elements are arranged on a substrate, and a first and a first for supplying current to the driving circuit. And a peripheral region provided with two power supply wirings,
The light emitting element is provided between a lower first electrode and an upper second electrode,
The drive circuit is connected to a first power supply wiring and supplies a drive current to the light emitting element through the first electrode;
The second electrode is connected to a second power wiring below the second electrode through a contact hole provided in the peripheral region,
Within the plane of the substrate, at least a part of the first power supply wiring is along the second power supply wiring on both sides of the second power supply wiring contacting the second electrode through the contact hole. It is arranged.

Further, the display device of the present invention is a display device having a display region in which a plurality of light emitting elements and a plurality of drive circuits for controlling the drive current of the light emitting elements are arranged on a substrate,
The light emitting element is provided between a lower first electrode and an upper second electrode,
The drive circuit is connected to a first power supply line and supplies a drive current to the light emitting element through the first electrode;
The second electrode is connected to a second power line below the second electrode through a contact hole provided around the display area,
In the plane of the substrate, the first power supply wiring is disposed along one side of the second power supply wiring along the second power supply wiring, and the second power supply wiring is connected to the second electrode through the contact hole. The width extends from the portion in contact with the first power supply wiring to the side opposite to the side where the first power supply wiring is disposed.

  According to the present invention, potential fluctuation of a power supply wiring connected to a region where a plurality of components including a light emitting element and a driving circuit (pixel circuit) for passing a current to the light emitting element are arranged can be detected. It is possible to reduce the frame area without increasing it. It is possible to provide a display device that can reduce deterioration in display quality due to the influence of potential fluctuations even when the display area is increased in area and definition.

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

  The organic EL element is a current-driven light-emitting element, that is, an element that emits light with luminance corresponding to a flowing current. The present invention is suitably applied to an active matrix display device using organic EL elements. Hereinafter, the structure of an EL element common to some embodiments of the present invention will be described.

  FIG. 1 is a cross-sectional view of an organic EL element section 20 formed on a substrate 10 and a drive circuit 19 thereof. An equivalent circuit is shown in FIG.

  The organic EL element unit 20 includes a lower first electrode 22, an upper second electrode 24, and several organic compound layers sandwiched between the first electrode 22 and the first electrode 22 (becomes an organic EL element). ) 23. In the case of a color display device, EL elements of three colors RGB including different organic compound layers are arranged, and organic layers 23a and 23b constituting light emitting elements of different colors are formed in adjacent pixels.

  The current supplied to the organic EL element portion 20 flows between the lower first electrode 22 and the upper second electrode 24. The first electrode 22 is provided separately for each pixel, and the second electrode 24 is provided in common for each pixel. An element isolation layer 26 is provided between the pixels in order to prevent current leakage to adjacent pixels.

The second electrode 24 is an electrode common to all pixels, and covers the organic EL layer (becomes an organic EL element) 23 over the entire display region. In the top emission type organic EL display device in which light is extracted upward, the second electrode is a transparent electrode.
The first electrode 22 is provided on an insulating film (insulating layer) 28 in order to insulate from the drive circuit 19. The insulating film 28 is formed using an organic resin material in order to keep the upper surface on which the first electrode 22 is formed flat. Hereinafter, the insulating film 28 is also referred to as a planarizing film.

  In FIG. 1, a cross section of a driving TFT including a semiconductor layer 11, a gate electrode 12, a source electrode 13, a drain electrode 14, and an insulating film 15 is depicted as the driving circuit 19. In the driving transistor (TFT), the drain electrode 14 is connected to the first electrode 22 of the organic EL element 20. The driving transistor (TFT) corresponds to the transistor M1 in FIG. In addition to this, the drive circuit 19 includes switching transistors (TFTs) M2, M3, M4 and a capacitor C1 (not shown in FIG. 1) shown in the circuit of FIG.

  The power of the drive circuit 19 is supplied through a plurality of power supply lines 16 provided in the row direction or the column direction in the display area. The drive current of the organic EL element unit 20 is supplied from the first electrode 22 to the organic EL element 23 through the drive TFT of the drive circuit 19 from the power supply line 16 and flows out to the second electrode 24. In FIG. 2, the power supply line 16 corresponds to the power supply line 103.

  Depending on the layer configuration of the organic EL element 23, the current flows in the opposite direction. At that time, an NMOS transistor is used as the drive transistor M1 in FIG. 2, the cathode and anode of the EL element are switched, and the power supplies VCC and GND are switched.

  The entire second electrode 24 is covered with a protective layer (hereinafter referred to as a passivation film) 25 in order to block moisture intrusion from the outside air.

In the following embodiments, an organic EL element will be described as an example. Instead of the organic EL layer (organic EL element) 23, current-driven light emission in which an inorganic EL, an LED, or another light emitting material is sandwiched between a pair of upper and lower electrodes. It may be an element.
(Embodiment 1)
FIG. 3 is a schematic view of the organic EL display device according to the first embodiment of the present invention. 4A, 4B, and 4C are enlarged views of portions A, B, and C of FIG.

  The display device 100 of FIG. 3 includes a single substrate 10, and the substrate surface includes a display region 6 (inside the inner two-dot chain line region) and a peripheral region 3 (region surrounded by the inner and outer two-dot chain lines). It is divided into. When the substrate surface is covered with a glass or metallic cap in order to shield the EL element from the outside air, an adhesive region 4 for adhering the sealing cap is provided on the outer side of the peripheral region 3.

  The display area 6 is an area in which the organic EL element unit 20 and the drive circuit 19 shown in FIG. 1 are arranged in a row direction and a column direction (in a matrix). In the present embodiment, the power supply line 16 is provided in the row direction and is parallel to the gate signal line. The power supply line 16 can also be provided in the vertical direction in parallel with the gate signal line.

  In the peripheral region 3, peripheral circuits such as a column control circuit, a column shift register, and a row shift register (not shown) are arranged. These circuits are formed by the same process as the drive circuit 19 and are formed by the same semiconductor layer 11 and other layers as the TFTs of the drive circuit 19.

  A video signal, a control signal, a power source, and the like are supplied from the outside via the external connection terminal 5. In FIG. 3, the external connection terminals 5 are arranged on one lower side of the substrate 10, but may be arranged on two left and right sides.

  The peripheral region 3 includes two systems of a first power supply wiring (hereinafter referred to as a power supply line) 1 for supplying power to a drive circuit (pixel circuit) and a second power supply wiring (hereinafter referred to as a common potential line) 21. Power supply wiring is arranged.

  The power supply line 1 and the common potential line 21 are arranged along the periphery of the display area 6 and are terminated at the external connection terminals 5, respectively.

  A power supply line 16 is commonly connected to the power supply line 1 and is connected to one or more of the external connection terminals 5. The power supply line 1 is maintained at a constant voltage supplied from an external power source (not shown) through the external connection terminal 5. The common potential line 21 is a wiring provided to guide the second electrode 24 of the organic EL element unit 20 to the external connection terminal 5.

  FIG. 5 is a cross-sectional view taken along A-A ′ of the peripheral region 3, and FIG. 6 is a cross-sectional view taken along B-B ′.

  The power supply line 1 and the common potential line 21 are both made of the same metal as the source / drain electrodes 13 and 14 of the drive circuit (pixel circuit) 19 in order to reduce the resistance. The power supply line 1 and the common potential line 21 are also formed at the same time in the process of forming and patterning the source / drain electrodes 13 and 14.

  In this embodiment, since the power supply line 16 is formed by the same process as the gate metal, the power supply line 16 and the power supply lines 1a and 1b are connected with a structure similar to that in FIG. 6 near the intersection.

  Since the common potential line 21 is formed below the second electrode 24 with the insulating layer (planarization film) 28 interposed therebetween, the common potential line 21 is connected to the second electrode 24 through the contact hole 2.

  The passivation film 25 has the same thickness as that of the display region 6 on the contact hole 2 and gradually becomes thinner on the outside thereof. It does not reach the region 4 to which the sealing cap is bonded.

  The contact hole 2 is an opening formed continuously in a square shape along the four sides of the second electrode 24 extended to the peripheral region 3. A plurality of contact holes 2 may be provided in a flying manner, but in that case, the interval is made narrow enough to maintain the separation effect of the planarization film 28.

  Further, in order to reduce the contact resistance between the second electrode 24 and the common potential line 21, the area of the contact hole 2 is increased as much as possible. Therefore, it is preferable to open the contact hole to the full width of the common potential line 1.

  Two power supply lines 1 are provided in parallel on both sides of the common potential line 21 (which can be said to be arranged on both sides of the contact hole 2). The power supply line 1 is disposed along the common potential line 21.

  In FIG. 3, two power supply lines 1a and 1b are provided in the peripheral region 3 on the left and right sides with the common potential line 21 interposed therebetween. In addition to this, on the lower side where the external connection terminal 5 is disposed, the power supply line 1 may be divided into two with the common potential line 2 interposed therebetween. Moreover, you may divide | segment in the upper side facing the edge | side where the external connection terminal 5 is arrange | positioned. Two may be provided on the lower side and the left and right sides, or on all sides.

  The divided power supply line 1 is detoured via the lower conductive material 51 at the end B-B ′ shown in FIG. 6. The power supply line 16 is also connected to the two power supply lines 1a and 1b with the same structure. The lower conductive material 51 is preferably formed simultaneously with the gate metal layer 12.

  The contact hole 2 also plays a role of blocking the surface water intrusion path through the planarizing film by dividing the planarizing film 28.

  The contact hole 2 separates the planarizing film 28 into two parts on the display region side and the substrate edge side. As a result, moisture that enters through the planarizing film 28 can be stopped at the contact hole 2 without entering the display region 6.

  As described above, the contact hole 2 is required to be arranged at a predetermined distance from the edge of the substrate or the inner edge of the adhesion region 4 in order to secure the thickness of the passivation film. In addition, the contact hole 2 is required to be arranged with a certain distance from the outer edge of the display area 6 in order to ensure a margin of misalignment of the organic EL layer in the display area.

  In this embodiment, two power supply lines 1 are provided in at least a part of the peripheral region 3, one is arranged between the outer edge of the display region 6 and the inner edge of the common potential line 21, and the other is the common potential line 21. Between the outer edge of the sealing cap and the inner edge of the sealing cap bonding region 4. The latter may overlap with a region where the thickness of the passivation film 25 is reduced. When the cap is not sealed, the inner edge of the adhesion region can be replaced with the substrate end.

  By arranging the two power supply lines 1 on both sides of the common potential line 21, the width of the power supply line 1 as a whole can be increased, the wiring resistance of the power supply line 1 is reduced, and a large current flows. But the voltage drop is small.

  Now, let A be the minimum wiring width required for the common potential line 21 and B be the minimum wiring width required for the power supply line 1. When the area of the contact hole 2 is made as large as possible, the width A becomes almost the same as the common potential line 21. A distance margin necessary for the outside is M1, and a distance margin necessary for the inside is M2.

  When the power supply line 1 is disposed only inside the common potential line 21 as in the conventional case, the width of B is required inside the contact hole. When this is larger than M2, the frame width as a whole becomes A + B + M1. When the power supply line 1 is arranged only outside the common potential line 21, A + B + M2.

  If the power supply line 1 is divided into two lines having widths b1 and b2 (b1 + b2 = B) as in this embodiment, and these are made smaller than M1 and M2, respectively, the entire frame width becomes A + M1 + M2, It becomes smaller than these two conventional values.

Dividing the power supply line 1 into two in this way is also effective in reducing the frame area.
(Embodiment 2)
FIG. 7 is a schematic view showing a second embodiment of the display device of the present invention. The same parts as those in the first embodiment are denoted by the same reference numerals. The EL element and the drive circuit in the display area are the same as those in the first embodiment.

  FIG. 8 shows a C-C ′ cross section of the peripheral region.

  Although the power supply line 1 is divided into two in the first embodiment, the power supply line 1 is divided into one in the present embodiment, and is shared inside the common potential line 21 (one side of the common potential line), that is, on the side close to the display region 6. It is provided in parallel with the potential line 21 (along the common potential line 21). Note that one side of the common potential line can be said to be one side of the contact hole.

  The second electrode 24 and the common potential line 21 are not in direct contact with each other and sandwich another metal layer 29 therebetween. This is to reduce the contact resistance between the second electrode and the common potential line. If the contact resistance is originally low, the metal layer 29 is not always necessary. As shown in FIG. 8, the metal layer 29 is preferably formed on the same surface as the first electrode 22 with the same material and in the same process.

  As described in the first embodiment, it is necessary to keep a certain distance from the outer edge of the contact hole 2 to the bonding region 4.

  When the contact resistance is lowered by introducing the metal layer 29, the width of the contact hole 2 can be made narrower than the width of the common potential line 21. At this time, a part of the common potential line 21 is widened to the side opposite to the power supply line 1, that is, outside, and protrudes from the contact hole (extends outside and widens), and the power supply line 1 in parallel. In other words, the second power supply wiring in this case is composed of two parts: a common potential line 21a in contact with the second electrode through the contact hole, and a common potential line 21b widened from the contact hole. However, since the width of the contact hole 2 is narrower than that of the first embodiment, the width of the common potential line 21a is narrower, but the width combined with the common potential line 21b is the same as that of the first embodiment so that the wiring resistance does not increase. The width is kept.

  The width a1 of the common potential line 21a is the same as the contact hole width. The width of the common potential line 21b is a2, the minimum wiring width of the power supply line 1 is B, and the margins on both sides of the contact hole are M1 and M2. The width a of the contact hole is equal to a1. Further, a1 + a2 = A.

  Since the power supply line 1 is disposed on the inner side with respect to the contact hole 2, only the width B to the display area is required on the inner side, which is wider than the minimum margin M2. On the other hand, outside the contact hole, when the width a2 of the common potential line 21b can be absorbed within the margin M1 up to the bonding region, that is, when a2 <M1, the required width outside is M1.

  Therefore, it can be seen that the entire frame width is a + B + M1, which can be narrower than the conventional width A + B + M1.

  When a2> M1 holds and the width a2 of the common potential line 21b cannot be absorbed within the range of M1, the outer required width is a2, and the entire frame width is a1 + a2 + B, that is, A + B. This is also narrower than the conventional width.

  As described above, when the contact hole width a can be narrower than the common potential line width A as in the present embodiment, the frame can be narrowed by widening the common potential line outside the contact hole.

  When the frame width a + B + M1 or A + B is compared with the frame width A + M1 + M2 of the first embodiment, the width A of the common potential line can be absorbed within the range of M1, and the first is satisfied when a2> B−M2. It becomes narrower than the frame width of the embodiment. That is, if the contact hole width a is sufficiently smaller than the width A of the common potential line and the increase due to the single power supply line 1 can be absorbed, the overall frame width becomes narrower than that of the first embodiment.

  It is also possible to dispose the power supply line 1 outside the contact hole 2 and extend the common potential line 1 from the contact hole 2 to the inside. The frame width only replaces M1 and M2 with the above results, and the conclusion remains the same.

  Since the current flowing through the power supply line 1 is large at the lower side where the external connection terminal 5 is located, the width B of the power supply line 1 is preferably larger than that of the left and right sides. In such a case, the above condition a2> B-M2 does not hold, and if the configuration of the second embodiment is adopted, the frame will instead spread. In such a case, the configuration of the first and second embodiments is adopted depending on the side, such as adopting the configuration of the second embodiment on the left and right sides and adopting the configuration of the first embodiment on the lower side. It is also effective to use different types.

As described in the above two embodiments, in the present invention, either one of the power supply line and the common potential line is provided on both sides of the contact hole that surrounds the display area and blocks the moisture intrusion path. . As a result, the width of the power supply wiring can be increased, and a voltage drop in the power supply wiring can be prevented. Further, a portion around the display area, so-called frame width, can be reduced.
(Pixel circuit)
Hereinafter, a pixel circuit common to the first and second embodiments will be described with reference to FIG. FIG. 2 shows an EL element and its drive circuit (pixel circuit).

  The source of the driving transistor M1 is connected to the power supply line 103, the gate is connected to the capacitor C1 and the source of the transistor M2, and the drain is connected to the EL element EL via the transistor M4.

  The control lines 104 and 105 switch the driving circuit (pixel circuit) between the programming operation and the light emitting operation, and turn on / off the switching transistors of the transistors M2 to M4. In the programming period, the transistors M2 and M3 are turned on, the transistor M4 is turned off, and a current value is written in the capacitor C1. The current data I (data) flows through the data signal line 102 and the transistor M3 to M1 in which the gate and the drain are short-circuited, and as a result, a current value is written in the capacitor C1.

  During the light emission period, the transistors M2 and M3 are off and the transistor M4 is on. The current written in the capacitor C1 flows to the EL element EL through the transistors M1 to M4, and the EL element emits light according to the flowing current.

  Note that the EL element emission control method includes a voltage setting method in addition to the current setting method shown in FIG. The present invention can be applied to any of them.

  The display devices of Embodiments 1 and 2 are top emission type EL display devices, but can also be applied to bottom emission type EL display devices that extract light from the transparent substrate side on which the drive circuit (pixel circuit) is formed. It is. In this case, a transparent electrode is used as the pixel electrode that is the first electrode below the substrate. The second electrode in the upper layer may be a transparent electrode, but a metal electrode such as aluminum is used when reflected light is used.

  The display device using the EL element has been described above as an example. However, the present invention is not limited thereto, and can be applied to a current-driven display device such as a plasma display panel (PDP) or a field emission display (FED). It is.

  The display devices of Embodiments 1 and 2 described above can constitute an information display device. This information display device is a mobile phone, a mobile computer, a still camera, a video camera, or the like, or a device that realizes a plurality of these functions. The information display device includes an information input unit. For example, in the case of a mobile phone, the information input unit includes an antenna. In the case of a PDA or a portable personal computer, the information input unit includes an interface unit for the network. In the case of a still camera or a movie camera, the information input unit includes a sensor unit such as a CCD or CMOS.

  Hereinafter, as an embodiment of the present invention, a digital camera using the display device described in Embodiment 1 or 2 will be described.

  FIG. 9 is a block diagram of an example of the digital still camera system of the present embodiment. In the figure, 50 is a digital still camera system, 51 is a photographing unit (imaging unit), 52 is a video signal processing circuit, 53 is a display panel, 54 is a memory, 55 is a CPU, and 56 is an operation unit.

  In FIG. 9, a video image captured by the imaging unit 51 or a video image recorded in the memory 54 can be signal-processed by the video signal processing circuit 52 and viewed on the display panel 53. The CPU 55 controls the photographing unit 51, the memory 54, the video signal processing circuit 52, and the like by input from the operation unit 56, and performs photographing, recording, reproduction, and display suitable for the situation. In addition, the display panel 53 can be used as a display unit of various electronic devices.

  INDUSTRIAL APPLICABILITY The present invention is used for a display device having a display area in which a plurality of unit pixels each including a current-driven light-emitting element and a pixel circuit (drive circuit) that controls a drive current of the light-emitting element are arranged on a substrate. . In particular, it is suitably used for a display device in which electroluminescence (EL) elements that emit light by passing a current are arranged in a matrix.

It is sectional drawing which shows the structure of an organic EL element. It is a circuit diagram which shows the pixel circuit of an organic EL element. 1 is a plan view of a display device according to a first embodiment of the present invention. (A), (b), (c) is an enlarged view of A part, B part, and C part of FIG. FIG. 4 is a cross-sectional view taken along line A-A ′ of FIG. 3. FIG. 4 is a cross-sectional view taken along line B-B ′ of FIG. 3. It is a top view of the display apparatus of the 2nd Embodiment of this invention. FIG. 8 is a cross-sectional view taken along line C-C ′ of FIG. 7. It is a block diagram of an example of a digital still camera.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Power supply line 2 Contact hole 3 Peripheral area | region 4 Adhesion area | region 5 External connection terminal 6 Display area 10 Substrate 21 Common potential line 22 1st electrode 23 Organic EL layer 24 2nd electrode 25 Passivation film 26 Element isolation film 28 Planarization film 29 Metal layer

Claims (4)

On the substrate, a light emitting element and a drive circuit that is provided in a lower layer of the light emitting element via an insulating layer and controls a current flowing through the light emitting element are arranged in a row direction and a column direction, respectively.
The light emitting element is provided on the insulating layer covering the driving circuit, between the lower first electrode and the upper second electrode,
The first electrode is connected to a first power supply wiring disposed around a region where the light emitting element and the driving circuit are disposed on the substrate via the driving circuit,
The second electrode is a display device that is connected to a second power supply line through a contact hole that surrounds the region and is opened in the insulating layer,
The first power supply wiring disposed on one side of the contact hole and the first power supply wiring or the second power supply wiring disposed on the opposite side of the contact hole along at least one side of the substrate The widening part of this is arrange | positioned in parallel, The display apparatus characterized by the above-mentioned. Provided on the substrate are a display area in which a plurality of light emitting elements and a driving circuit for controlling the driving current of the light emitting elements are arranged, and first and second power supply lines for supplying current to the driving circuit. A display device having a peripheral region,
The light emitting element is provided between a lower first electrode and an upper second electrode,
The drive circuit is connected to a first power supply line and supplies a drive current to the light emitting element through the first electrode;
The second electrode is connected to a second power line below the second electrode through a contact hole provided in the peripheral region,
Within the plane of the substrate, at least a part of the first power supply wiring is along the second power supply wiring on both sides of the second power supply wiring contacting the second electrode through the contact hole. A display device characterized by being arranged. A display device having a display region in which a plurality of light emitting elements and a plurality of driving circuits for controlling driving currents of the light emitting elements are arranged on a substrate,
The light emitting element is provided between a lower first electrode and an upper second electrode,
The drive circuit is connected to a first power supply line and supplies a drive current to the light emitting element through the first electrode;
The second electrode is connected to a second power line below the second electrode through a contact hole provided around the display area,
In the plane of the substrate, the first power supply wiring is disposed along one side of the second power supply wiring along the second power supply wiring, and the second power supply wiring is connected to the second electrode through the contact hole. A display device characterized in that the width extends from the portion in contact with the first power supply wiring to the side opposite to the side where the first power supply wiring is disposed.   4. The video signal processing unit comprising: the display device according to claim 1; an imaging unit that images a subject; and a video signal processing unit that processes a signal captured by the imaging unit. A video signal that has been subjected to signal processing in (1) is displayed on the display device.