KR100853346B1 - Display and method of manufacturing the same - Google Patents

Abstract

The manufacturing method of the display device of the present invention comprises the steps of selecting one or more of the plurality of pixels PX, which may be viewed as bright spots with a bright or dark line afterimage when an inspection image is displayed, The pixel PX includes a step of disconnecting the first conductive path connecting the display element OLED to the power supply terminal ND1 and the second conductive path connecting the first conductive path to the video signal line DL.

Bright line shape, dead line shape, bright point, afterimage, display device

Description

Display device and manufacturing method therefor {DISPLAY AND METHOD OF MANUFACTURING THE SAME}

TECHNICAL FIELD This invention relates to a display apparatus and its manufacturing method. Specifically, It is related with an active matrix display apparatus and its manufacturing method.

In an organic electroluminescent (EL) display device, poor image quality such as luminance unevenness occurs when the drive current changes. Therefore, when the active matrix drive method is used in this display device, the characteristics of the drive control element for controlling the magnitude of the drive current should be substantially the same between each pixel. In this display device, however, the drive control element is usually formed on an insulator such as a glass substrate, so that the characteristics of the element tend to be different.

In US Pat. No. 6,373,454, an organic EL display device using a current mirror circuit for a pixel is described. This pixel includes an n-channel field effect transistor (FET) as a drive control element, an organic EL element, a capacitor, an output control switch, a video signal supply control switch, and a diode-connected switch.

The source of the drive control element is connected to the first power supply line having a low potential, and the capacitor is connected between the gate of the drive control element and the first power supply line. The output control switch is connected between the drain of the drive control element and the cathode of the organic EL element, and the anode of the organic EL element is connected to a second power supply line of higher potential. The video signal supply control switch is connected between the drain of the drive control element and the video signal line, and the diode-connected switch is connected between the drain and gate of the drive control element.

During the writing period, the current signal I _{sig, which} is a video signal, is supplied to the pixel including this current mirror type circuit. During the sustain period following the write period, a drive current of substantially the same magnitude as the electric current I _sig flows between the drain and the source of the drive control element. Therefore, the influence of not only the threshold value V _th of the drive control element but also the mobility, dimensions, and the like on the drive current can be eliminated.

By the way, in an active matrix display device, some pixels are often seen as luminous dots or dark dots due to disconnection or short circuit in the pixel circuit. In addition, in an active matrix display device, a column or row of pixels is often seen as luminous lines or dark lines due to disconnection of scan signal lines, video signal lines, and the like.

In the present invention, in the active matrix display device in which the current signal is written as a video signal to the pixel circuit, the inventors have a bright or dead line tail in addition to the linear or dot luminance unevenness in the image. It was discovered that spots of light could occur.

SUMMARY OF THE INVENTION An object of the present invention is to prevent the occurrence of bright spots having a bright line or a dark line afterimage in an image in an active matrix display device which writes a current signal as a video signal to a pixel circuit.

According to a first aspect of the present invention, there is provided a display device having an insulating substrate, a plurality of pixels arranged in a matrix on the insulating substrate, and a plurality of image signal lines arranged corresponding to columns formed by the plurality of pixels. Each of the pixels of the driving control element includes a control terminal, a first terminal connected to the first power supply terminal, and a second terminal for outputting a current having a magnitude corresponding to the voltage between the control terminal and the first terminal; A display element comprising a first electrode, a second electrode connected to a second power supply terminal, an organic material layer interposed between the first electrode and the second electrode, an output control switch connected between the second terminal and the first electrode, and A switch for switching the electrical connection between a first terminal in which the two terminals, the video signal line and the control terminal are electrically interconnected, and a second terminal and the second state in which the video signal line and the control terminal are electrically disconnected from each other. And a capacitor connected to the control terminal, wherein in some of the plurality of pixels, the first conductive path electrically connecting the first electrode to the first power supply terminal, and the second terminal electrically connected to the video signal line. The second conductive paths to be connected are disconnected.

According to a second aspect of the present invention, there is provided an insulating substrate, a plurality of pixels arranged in a matrix shape on the insulating substrate, and a plurality of video signal lines arranged corresponding to columns formed by the plurality of pixels, Each of the drive control elements includes a control terminal, a first terminal connected to the first power supply terminal, a second terminal for outputting a current having a magnitude corresponding to the voltage between the control terminal and the first terminal, and a first terminal. A display element comprising an electrode, a second electrode connected to the second power supply terminal, an organic material layer interposed between the first electrode and the second electrode, an output control switch connected between the second terminal and the first electrode, A switch group for switching an electrical connection between a first state in which the second terminal, the video signal line, and the control terminal are electrically interconnected, and a second state in which the second terminal, the video signal line and the control terminal are electrically disconnected from each other; only A method of manufacturing a display device having a capacitor connected to a step, the method comprising: selecting one or more of a plurality of pixels that may be viewed as bright spots or bright spots having a afterimage-shaped afterimage when an inspection image is displayed; And disconnecting the first conductive path electrically connecting the first electrode to the first power supply terminal and the second conductive path electrically connecting the second terminal to the video signal line of the selected pixel. A method is provided.

1 is a plan view schematically illustrating a display device according to an exemplary embodiment of the present invention.

FIG. 2 is a sectional views schematically showing an example of a structure usable as the display device shown in FIG. 1; FIG.

3 is a plan view schematically showing an example of a structure usable as a pixel of the display device shown in FIG. 1;

4 is a plan view schematically showing the structure after repairing the pixel of FIG. 3; FIG.

5 is an equivalent circuit diagram of a pixel included in a display device according to a modification.

6 is a plan view schematically showing an example of a structure usable as a pixel of a display device according to a modification.

FIG. 7 is a plan view schematically illustrating an example of a structure after repairing the pixel of FIG. 6; FIG.

FIG. 8 is a plan view schematically showing another example of the structure after repairing the pixel of FIG. 6; FIG.

Embodiments of the present invention are described in detail below with reference to the accompanying drawings. Note that the same reference numerals are assigned to components exhibiting the same or similar functions, and redundant descriptions are omitted.

1 is a plan view schematically illustrating a display device according to an exemplary embodiment of the present invention. FIG. 2 is a cross-sectional view schematically showing an example of a structure usable as the display device shown in FIG. 1. 3 is a plan view schematically illustrating an example of a structure usable as a pixel of the display device illustrated in FIG. 1. Note that the display device in FIG. 2 is shown such that its display surface, that is, the front surface or the light output surface faces downward, and the back surface faces upward. It is to be noted that Fig. 3 shows the structure of the pixel viewed from the display surface side.

This display device is a bottom emission type organic EL display device using an active matrix driving method. The display device includes an insulating substrate SUB such as a glass substrate.

Above this SUB, as shown in FIG. 2, as an undercoat layer UC, for example, a SiN _x layer and a SiO _x layer are sequentially stacked.

On the undercoat layer UC, for example, a gate insulating film GI which can be formed using a semiconductor layer SC, for example, tetraethyl orthosilicate (TE0S), which is a polysilicon layer in which channels, sources and drains are formed, and a gate G made of, for example, MoW. Are sequentially stacked to form a top gate TFT. In this embodiment, these TFTs are p-channel TFTs and are used as drive control elements DR and switches SW1 to SW3 included in each pixel PX shown in FIGS. 1 and 3.

On the gate insulating film GI, the scan signal lines SL1 and SL2 shown in FIG. 1 and the electrode E1 shown in FIGS. 1 to 3 are also disposed. The scan signal lines SL1 and SL2 and the electrode E1 can be formed in the same process as the gate G.

As shown in Fig. 1, the scan signal lines SL1 and SL2 extend in the row direction (X direction) of the pixel PX and are alternately arranged in the column direction (Y direction) of the pixel PX. The scan signal lines SL1 and SL2 are connected to the scan signal line driver YDR.

The electrode E1 is connected to the gate G of the drive control element DR. Each electrode E1 is used as one electrode of the capacitor C (to be described later).

The gate insulating film GI, the gate G, the scan signal lines SL1 and SL2, and the electrode E1 are covered with the interlayer dielectric II shown in FIG. The interlayer dielectric II is made of, for example, an SiO _x film formed by a plasma CVD method or the like. The portion of the interlayer dielectric II disposed on the electrode E1 is used as the dielectric layer of the capacitor C. FIG.

Above the interlayer dielectric II, a source electrode SE and a drain electrode DE shown in FIGS. 2 and 3, an image signal line DL and a power supply line PSL shown in FIGS. 1 and 3, and an electrode E2 shown in FIG. . These components can be formed in the same process and have a three-layer structure of Mo / Al / Mo, for example.

The source electrode SE and the drain electrode DE are electrically connected to the source and the drain of the TFT, respectively, through contact holes provided in the interlayer dielectric II.

As shown in Figs. 1 and 3, the video signal lines DL extend in the Y direction and are arranged in the X direction. These video signal lines DL are connected to the video signal line driver XDR.

In this embodiment, as shown in Fig. 3, the power supply lines PSL extend in the Y direction and are arranged in the X direction.

The electrode E2 is connected to the power supply line PSL. Each electrode E2 is used as the other electrode of the capacitor C.

The source electrode SE, the drain electrode DE, the video signal line DL, the power supply line PSL, and the electrode E2 are covered with a passivation film PS shown in FIG. This passivation film PS consists of SiN _x , for example.

On this passivation film PS, as shown in FIG. 2, the light transmissive 1st electrode PE which is a front electrode is mutually spaced apart and juxtaposed. Each first electrode PE is a pixel electrode and is connected to the drain electrode DE of the switch SW1 through a through hole provided in the passivation film PS as shown in FIGS. 2 and 3.

In this embodiment, the first electrode PE is an anode. As a material of the first electrode PE, for example, a transparent conductive oxide such as indium tin oxide (IT0) can be used.

Above this passivation film PS, the partition insulating layer PI shown in FIG. 2 is arrange | positioned. The partition insulation layer PI is provided with the through hole in the position corresponding to 1st electrode PE, or the slit is provided in the position corresponding to the column or row formed by 1st electrode PE. In this embodiment, as an example, a through hole is provided at the position of the partition insulation layer PI corresponding to the first electrode PE.

The partition insulation layer PI is an organic insulation layer, for example. The partition insulation layer PI may be formed using, for example, photolithography technology.

On each first electrode PE, an organic material layer ORG including a light emitting layer is disposed. The light emitting layer is, for example, a thin film containing a light emitting organic compound whose emission color is red, green or blue. The organic layer ORG may further include a hole transport layer, a hole injection layer, a hole blocking layer, an electron transport layer, an electron injection layer, etc. in addition to the light emitting layer.

The partition insulation layer PI and the organic material layer ORG are covered with the 2nd electrode CE which is a back electrode. The second electrode CE is a common electrode connected between the pixel PXs, and in this embodiment is a light reflective cathode. The second electrode CE is electrically connected to, for example, an electrode wiring (not shown) formed in the same layer in which the video signal line DL is formed through a contact hole provided in the passivation film PS and the partition insulation layer PI. Each organic EL element OLED is composed of a first electrode PE, an organic material layer ORG, and a second electrode CE.

Each pixel PX includes an organic EL element OLED and a pixel circuit. In this embodiment, as shown in Figs. 1 and 3, the pixel circuit includes the drive control element DR, the output control switch SW1, the video signal supply control switch SW2, the diode-connected switch SW3, and the capacitor C. do. In this embodiment as described above, the drive control elements DR and the switches SW1 to SW3 are p-channel TFTs. In addition, in this embodiment, the video signal supply control switch SW2 and the diode-connected switch SW3 are connected to each other in the connection state between the drain of the drive control element DR and the video signal line DL and the gate of the drive control element DR. The switch group which switches between one state and the 2nd state from which they isolate | separated from each other is comprised.

The drive control element DR, the output control switch SW1 and the organic EL element OLED are connected in series in this order between the first power supply terminal ND1 and the second power supply terminal ND2. In this embodiment, the first power supply terminal ND1 is a high potential power supply terminal, and the second power supply terminal ND2 is a low potential power supply terminal.

The gate of the output control switch SW1 is connected to the scan signal line SL1. The video signal supply control switch SW2 is connected between the video signal line DL and the drain of the drive control element DR, and the gate of the video signal supply control switch SW2 is connected to the scan signal line SL2. The diode-connected switch SW3 is connected between the drain and the gate of the drive control element DR, and the gate of the diode-connected switch SW3 is connected to the scan signal line SL2. The capacitor C is connected between the gate of the drive control element DR and the constant potential terminal ND1 '.

In the case of displaying an image in this organic EL display device, for example, the scan signal lines SL1 and SL2 are driven in line order. Then, in the writing period in which the video signal is written to a certain pixel PX, first, a scan signal for opening the switch SW1 to the scan signal line SL1 to which the pixel PX is connected is output as a voltage signal, and then switched to the scan signal line SL2 to which the pixel PX is connected. A scan signal for closing SW2 and SW3 is output as a voltage signal. In this state, the video signal line driver XDR outputs a video signal which is a current signal to the video signal line DL to which the pixel PX is connected, and sets the gate-source voltage of the drive control element DR to a size corresponding to the video signal. Thereafter, the scan signal line driver YDR outputs a scan signal for opening the switches SW2 and SW3 to the scan signal line SL2 to which the pixel PX is connected as a voltage signal, and closes the scan signal for closing the switch SW1 to the scan signal line SL1 to which the pixel PX is connected. Output as a voltage signal.

During the effective display period in which the switch SW1 is closed, a drive current having a magnitude corresponding to the gate-source voltage of the drive control element DR flows through the organic EL element OLED. The organic EL element OLED emits light at a luminance corresponding to the magnitude of the driving current.

By the way, in the active matrix display device which writes a current signal as a video signal to the pixel circuit as described above, a bright spot with a residual image having a linear shape or a dead line shape may be generated. The present inventors have investigated this phenomenon in great detail and found the following facts.

For example, suppose that the source and drain of the drive control element DR are short-circuited in the pixel PX connected to the scan signal lines SL1 and SL2 in the M-th row and the video signal line DL in the N-th column. In this case, the organic EL element OLED of the pixel PX always emits light at the maximum luminance during the effective display period. Therefore, this pixel PX is seen as a bright point.

In this case, in the writing period of the pixel PX, the video signal line driver XDR sets the N-th video signal line DL to a potential substantially the same as that of the first power supply terminal ND1. That is, the potential of the N-th video signal line DL rises excessively. Since the wiring capacity of the video signal line DL is so large that it cannot be ignored, for example, a writing period of several tens of lines is required until the potential of the video signal line DL in the Nth column is restored to an appropriate range.

Therefore, of the pixels PX connected to the N-th video signal line DL, a signal smaller than the output of the video signal line driver XDR is written to several dozen pixels after the (M + 1) th row. As a result, the luminance of each of these pixels PX is lower than the original luminance. Therefore, these pixels PX are seen as dead lines.

For this reason as described above, when the source and the drain of the drive control element DR are short-circuited, bright spots with an afterimage-shaped afterimage occur. As can be seen from the above description, the luminance of the dead line is not constant, and usually rises from one end on the bright point side to the other end.

The bright point with the afterimage of a curved line shape occurs, for example, when the source and the drain of the output control switch SW1 are short-circuited in the pixel PX connected to the scan signal lines SL1 and SL2 in the M-th row and the video signal line DL in the Nth column. .

That is, in this case, in the writing period of the pixel PX, the video signal line driver XDR sets the N-th video signal line DL to a potential lower than the second power supply terminal ND2. Therefore, in the pixel PX, the gate potential of the drive control element DR becomes very low. Therefore, the organic EL element OLED of the pixel PX always emits light at the maximum luminance in the effective display period. As a result, this pixel PX is seen as a bright point.

In this case, in the writing period of the pixel PX, the N-th video signal line DL is set to an excessively low potential. Since the wiring capacity of the video signal line DL is so large that it cannot be ignored, for example, a writing period of several tens of lines is required before the potential of the N-th video signal line DL recovers to an appropriate range.

Therefore, among the pixels PX connected to the N-th video signal line DL, a signal larger than the output of the video signal line driver XDR is written into several tens of pixels after the (M + 1) th row. As a result, the luminance of each of these pixels PX becomes higher than the original luminance. Therefore, these pixels PX are shown as bright lines.

For this reason as described above, when the source and the drain of the output control switch SW1 are short-circuited, the bright spots with the afterimage of the linear shape are generated. In addition, as can be seen from the above description, the luminance of the bright line is not constant, and is usually lowered from the end of the bright point side to the other end.

From the above facts, the present inventors have found that the following method can prevent the bright spots with the afterimages of the bright lines or the dead lines in the image from appearing.

That is, first, the structure shown in FIG. 1 and FIG. 2 is produced by the conventional method. Next, a repair process is performed.

In the repairing process, first, among the pixels PX, a pixel that can be viewed as a bright point with a residual image in the shape of a bright line or a dead line is selected. Note that the pixel selected here is the pixel PX corresponding to the bright point and not the pixel PX corresponding to the bright line or the dead line. Note that only the bright point having the afterimage in the Y direction is noted here.

Next, in the selected pixel PX, the first conductive path connecting the first electrode CE of the organic EL element OLED to the first power supply terminal ND1 and the second conductive path connecting the first conductive path to the video signal line DL are disconnected. Let's do it. For example, the first conductive path is disconnected at a portion where the output control switch SW1 and the first electrode PE of the organic EL element OLED are connected. For example, the second conductive path is disconnected at a portion where the video signal supply control switch SW2 and the video signal line DL are connected. In addition, the 1st and 2nd conductive paths are disconnected by irradiating a laser beam to the semiconductor layer SC of these conductive paths.

When the first conductive path is disconnected in the selected pixel PX, the organic EL element OLED included in the pixel PX does not emit light in the effective display period. Therefore, this pixel PX is not seen as a bright point.

If the second conductive path is disconnected in the selected pixel PX, the potential of the video signal line DL to which the pixel PX is connected is influenced by the potential of the first power supply terminal ND1 or the second power supply terminal ND2 during the writing period of the pixel PX. There is nothing to receive. Therefore, a bright line or a dead line does not generate | occur | produce by the influence of this pixel PX.

Therefore, when the previous repair is performed, it is possible to prevent the bright spots with the afterimages of the bright lines or the dead lines in the image from appearing.

This repair leaves the trace described below in the pixel PX. This will be described with reference to FIG. 4.

FIG. 4 is a plan view schematically showing the structure after repairing the pixel shown in FIG. 3.

As described above, in the present embodiment, the pixel PX, which can be seen as a bright point with a bright line or an afterimage of an afterimage, is selected, and both the first conductive path and the second conductive path are disconnected in the pixel PX. Therefore, in the completed organic EL display device, some pixels PX include two disconnected portions.

For example, the first conductive path is disconnected at the portion connecting the output control switch SW1 and the first electrode PE of the organic EL element OLED, and the second conductive path is connected to the video signal supply control switch SW2 and the video signal line DL. In the case of disconnection at the portion, the structure shown in Fig. 4 can be obtained. Note that when the semiconductor layer SC is crystalline such as polysilicon or the like, and each path is disconnected at the position of the semiconductor layer SC, a phase change from crystalline to amorphous can be generated by laser light irradiation to the semiconductor layer SC. do. In this case, even if the physical cutting of the semiconductor layer SC is incomplete by laser light irradiation, the electrical resistance is remarkably increased, so that the electrical cutting is not insufficient.

As mentioned above, although the organic electroluminescence display which uses the structure shown in FIG. 1 for the pixel PX was demonstrated, you may use another structure for the pixel PX. For example, the video signal supply control switch SW2 and the diode-connected switch SW3 are connected in series between the video signal line DL and the drain of the drive control element DR in this order, and the drain of the diode-connected switch SW3 is drive controlled. You may be connected to the gate of the element DR. Alternatively, the diode-connected switch SW3 may be connected between the gate of the drive control element DR and the video signal line DL, instead of being connected between the drain and the gate of the drive control element DR. Alternatively, the switch group may be configured by three or more switches instead of being composed of two switches, that is, the video signal supply control switch SW2 and the diode-connected switch SW3.

5 is an equivalent circuit diagram of a pixel included in a display device according to a modification. 6 is a plan view schematically showing an example of a structure usable as a pixel of a display device according to a modification. Note that Fig. 6 shows the structure of the pixel as seen from the display surface side.

Instead of connecting the video signal supply control switch SW2 between the video signal line DL and the drain of the drive control element DR, the pixel PX shown in Figs. 5 and 6 connects the video signal supply control switches SW2a and SW2b in this order in series. Except for this, it has the same structure as the pixel PX shown in FIG.1 and FIG.3. In other words, the switch group is composed of the video signal supply control switch SW2 and the diode-connected switch SW3, instead of the video signal supply control switch SW2a and SW2b and the diode-connected switch SW3. In this way, the switch group may consist of three or more switches.

When the structures shown in Figs. 5 and 6 are used for the pixel PX, the above-mentioned repair can be performed in the following manner. This will be described with reference to FIGS. 7 and 8.

FIG. 7 is a plan view schematically illustrating an example of a structure after repairing the pixel illustrated in FIG. 6. FIG. 8 is a plan view schematically showing another example of the structure after repairing the pixel illustrated in FIG. 6.

Even when the structures shown in Figs. 5 and 6 are used for the pixel PX, as described above, the pixel PX, which can be viewed as a bright point with a residual image in the shape of a bright line or a dead line, is selected. Next, the first and second conductive paths are disconnected in the pixel PX.

For example, the second conductive path can be disconnected at a portion connecting the video signal supply control switch SW2a and the video signal line DL. In this case, when the first conductive path is disconnected at the portion connecting the output control switch SW1 and the first electrode PE of the organic EL element OLED, the structure shown in Fig. 7 can be obtained.

The second conductive path can be disconnected at a portion connecting the video signal supply control switch SW2a and SW2b. In this case, when the first conductive path is disconnected at the portion connecting the output control switch SW1 and the first electrode PE of the organic EL element OLED, the structure shown in Fig. 8 can be obtained.

In the above-described organic EL display device, when viewed from a direction perpendicular to the main surface of the substrate SUB, an arrangement in which the first and second conductive paths and other wirings or electrodes do not overlap in the disconnection portion is used. In this way, damage to other wirings or electrodes can be suppressed by laser light irradiation for disconnecting the first and second conductive paths. In particular, when viewed from a direction perpendicular to the main surface of the substrate SUB, when the distance between the disconnected portion and the wiring or the electrodes other than the first and second conductive paths is about 2 μm or more, the first and second conductive paths are separated. By irradiating the laser light for disconnecting, it is possible to easily prevent damage to other wirings or electrodes.

Additional advantages and modifications will readily occur to those skilled in the art. Therefore, the invention in its broader aspects is not limited to the description and the representative embodiments described and illustrated therein. Accordingly, various modifications may be made without departing from the spirit and scope of the general inventive concept as defined by the appended claims and their equivalents.

According to the present invention, in the active matrix drive type display device which writes a current signal as a video signal to the pixel circuit, it is possible to prevent the bright spots having the afterimages of the bright lines or the dark lines.

Claims (11)

A display device comprising an insulating substrate, a plurality of pixels arranged in a matrix form on the insulating substrate, and a plurality of video signal lines arranged in correspondence to columns formed by the plurality of pixels. Each of the plurality of pixels, A drive control element including a control terminal, a first terminal connected to a first power supply terminal, and a second terminal for outputting a current having a magnitude corresponding to a voltage between the control terminal and the first terminal; A display element comprising a first electrode, a second electrode connected to a second power supply terminal, and an organic material layer interposed between the first electrode and the second electrode; An output control switch connected between the second terminal and the first electrode, Switching electrical connections between a first state in which the second terminal, the image signal line and the control terminal are electrically interconnected, and a second state in which the second terminal, the image signal line and the control terminal are electrically isolated from each other. Switch group, and A capacitor connected to the control terminal And a first conductive path electrically connecting the first electrode to the first power supply terminal, and a second conductive path electrically connecting the second terminal to the video signal line, in a portion of the plurality of pixels. Disconnecting display device. The switch group according to claim 1, wherein the switch group includes a video signal supply control switch connected to the video signal line, and a diode-connected switch connected to the control terminal. In the pixel in which the first and second conductive paths are disconnected, a portion of the first conductive path connecting the video signal supply control switch and the video signal line is disconnected, and the output control switch of the second conductive paths is disconnected. And a portion for connecting the first electrode to each other is disconnected. The switch group according to claim 1, wherein the switch group includes a plurality of video signal supply control switches connected in series to the video signal line and a diode-connected switch connected to the control terminal, In the pixel in which both of the first and second conductive paths are disconnected, a portion of the first conductive path connecting one of the plurality of video signal supply control switches and the video signal line is disconnected, and the second conductive path is disconnected. The display device of which the part which connects the said output control switch and a said 1st electrode is disconnected. The switch group according to claim 1, wherein the switch group includes a plurality of video signal supply control switches connected in series to the video signal line and a diode-connected switch connected to the control terminal, In the pixel in which both of the first and second conductive paths are disconnected, a portion of the first conductive paths connecting the plurality of video signal supply control switches to each other is disconnected, and the output of the second conductive paths is disconnected. A display device in which a portion connecting the control switch and the first electrode is disconnected. The method of claim 1, wherein the first and second conductive paths include first and second polysilicon portions, respectively. And the first and second polysilicon portions are disconnected in the pixel in which both the first and second conductive paths are disconnected. The display device according to claim 1, wherein the display element is an organic EL element. A method of manufacturing a display device comprising an insulating substrate, a plurality of pixels arranged in a matrix form on the insulating substrate, and a plurality of video signal lines arranged corresponding to columns formed by the plurality of pixels. Each of the plurality of pixels, A drive control element including a control terminal, a first terminal connected to a first power supply terminal, and a second terminal for outputting a current having a magnitude corresponding to a voltage between the control terminal and the first terminal; A display element comprising a first electrode, a second electrode connected to a second power supply terminal, and an organic material layer interposed between the first electrode and the second electrode; An output control switch connected between the second terminal and the first electrode, Switching electrical connections between a first state in which the second terminal, the image signal line and the control terminal are electrically interconnected, and a second state in which the second terminal, the image signal line and the control terminal are electrically isolated from each other. Switch group, and A capacitor connected to the control terminal Including, Selecting one or more of the plurality of pixels, which may be viewed as bright spots or bright spots with a residual image of a dead line when an inspection image is displayed; Disconnecting a first conductive path electrically connecting the first electrode to the first power supply terminal and a second conductive path electrically connecting the second terminal to the video signal line in the selected pixel; Method of manufacturing a display device comprising a. The manufacturing method of a display device according to claim 7, wherein the step of disconnecting the first and second conductive paths comprises a step of irradiating laser light to the first and second conductive paths. The method of claim 7, wherein the first and second conductive paths include first and second polysilicon portions, respectively. The step of disconnecting the first and second conductive paths includes the step of disconnecting the first and second polysilicon portions. The method of manufacturing a display device according to claim 9, wherein the step of disconnecting the first and second conductive paths comprises a step of irradiating the first and second polysilicon portions with laser light. The method of manufacturing a display device according to claim 7, wherein the display element is an organic EL element.

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