JP2005084233A - Display device and method for manufacturing display device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a display device with a high production yield and a method for manufacturing the display device. <P>SOLUTION: The display device is equipped with a plurality of storage capacitor elements 23, 24 and a plurality of pixel electrodes 21 respectively connected to the plurality of storage capacitor elements. The plurality of storage capacitor elements 23, 24 and the plurality of pixel electrodes 21 are respectively connected to a plurality of disconnectable first and second connection wires 44, 45. The respective pixel electrodes 21 and at least one out of the plurality of storage capacitor elements 23, 24 connected to the respective pixel electrodes are connectable through a connectable wire 46. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a display device having a storage capacitor element and a manufacturing method thereof.

  In recent years, for example, a liquid crystal display device has been used as a display device for performing image display. Such a liquid crystal display device includes an array substrate having a glass substrate. On the glass substrate, a plurality of signal lines and a plurality of scanning lines are arranged so as to intersect with each other, and pixels are formed in regions surrounded by the signal lines and the scanning lines, respectively.

  Each pixel includes a thin film transistor (hereinafter referred to as TFT) provided at each intersection of a signal line and a scanning line, a pixel electrode connected to the TFT, and a storage capacitor element connected to the pixel electrode. Have. The storage capacitor element has a storage capacitor line parallel to the scanning line and a storage electrode overlapped with the storage capacitor line via an insulating film, and the storage capacitor line is connected to the pixel electrode.

  In addition, the liquid crystal display device includes a counter substrate in which a counter electrode or the like is formed on another glass substrate. A liquid crystal layer is sandwiched between the array substrate and the counter substrate which are arranged to face each other with a predetermined gap.

  The liquid crystal display device configured as described above requires a very large number of pixels in order to display a large amount of data. For example, the screen of a liquid crystal display device used for a personal computer is composed of a plurality of pixels. Each pixel has one of three colors of red (R), green (G), and blue (B). Therefore, the typical number of pixels of the liquid crystal display device is several million. In recent years, the demand for image display has become higher year by year, and at the time of image display, there is a demand for a point defect that is as small as possible due to defective pixels (small number).

  As described above, it is important to provide a liquid crystal display device with few point defects and a manufacturing method thereof. However, it is very difficult to obtain a liquid crystal display device having no point defects, that is, a high product yield. If the product yield does not increase due to point defects, it leads to waste and high costs. This point defect is caused by, for example, a short circuit between the storage capacitor line and the storage electrode.

In order to suppress the point defect caused by the short circuit between the storage capacitor line and the storage electrode, the liquid crystal display device is configured by forming two storage capacitor elements per pixel (for example, see Patent Document 1). For this reason, the point defect can be repaired by separating the short-circuited storage capacitor element from the pixel electrode.
JP 2-79026

  However, as described above, when only two storage capacitor elements are formed per pixel, it is difficult to determine which storage capacitor element is short-circuited even if there is a point defect. Therefore, in the liquid crystal display device configured as described above, there is a possibility that a good storage capacitor element and a pixel electrode are cut off by mistake. If it is cut by mistake, the repair becomes difficult.

  The present invention has been made in view of the above points, and an object thereof is to provide a display device having a high product yield and a method for manufacturing the display device.

  In order to solve the above problems, a display device according to an aspect of the present invention includes a plurality of pixel electrodes and a plurality of storage capacitor elements connected to the pixel electrodes, and the pixel electrodes and the plurality of storage capacitors. A plurality of connection wirings each connecting and disconnecting the elements, and a connection wiring capable of connecting at least one of the pixel electrodes and a plurality of storage capacitor elements connected to one pixel electrode. It is characterized by that.

  According to another aspect of the present invention, there is provided a method for manufacturing a display device, comprising: a plurality of pixel electrodes; and a plurality of storage capacitor elements connected to the pixel electrodes, the pixel electrodes and the plurality of storage capacitors. A plurality of connection wirings each connecting and disconnecting the elements, and a connection wiring capable of connecting at least one of the pixel electrodes and a plurality of storage capacitor elements connected to one pixel electrode. In the display device manufacturing method, the potential of the storage capacitor line is changed to inspect the presence or absence of a point defect due to a short circuit of the storage capacitor element, and a plurality of storage capacitor elements connected to the pixel electrode where the point defect occurs are detected. Of these, cutting the connection wiring of the storage capacitor element connected to the connectable wiring, re-inspecting the presence or absence of point defects at the location where the connection wiring was disconnected, and if there is a point defect at the re-examined location, Point defect is raw Among storage capacitor elements connected to a pixel electrode at a certain location, after disconnecting a connection wiring of a storage capacitor element other than the storage capacitor element connected to the connectable wiring, the storage capacitor element is connected by the connectable wiring And the pixel electrode are connected.

  According to the present invention, a display device with a high product yield and a method for manufacturing the display device can be provided.

Hereinafter, embodiments in which a display device of the present invention is applied to a liquid crystal display device will be described in detail with reference to the drawings.
As shown in FIG. 3, the liquid crystal display device includes an array substrate 1 and a counter substrate 2 that are arranged to face each other with columnar spacers 6, and a liquid crystal layer 3 that is sandwiched between these two substrates. The array substrate 1 and the counter substrate 2 include, for example, glass substrates 4 and 5 as transparent insulating substrates, respectively.

  The array substrate 1 and the counter substrate 2 are joined together by a sealing material 7 disposed at the peripheral edge of both substrates. A backlight 8 is disposed on the outer surface side of the array substrate 1. The backlight 8 includes a light guide plate 9a disposed to face the array substrate 1, and a light source 9b and a reflection plate 9c disposed to face one side edge of the light guide plate.

  As shown in FIG. 4, the glass substrate 4 has a pixel portion 11, and a scanning line driving circuit 12, a signal line driving circuit 13, and a storage capacitor line driving circuit 14 located outside the pixel portion. Yes. In the pixel portion 11, a plurality of scanning lines 15 and a plurality of signal lines 16 are arranged in a matrix on the glass substrate 4. On the glass substrate 4, a plurality of storage capacitor lines 17 parallel to the scanning lines 15 are formed. In this embodiment, a pixel 18 is formed in a region surrounded by two adjacent signal lines 16 and two storage capacitor lines 17.

Next, one pixel 18 is taken out and described in detail.
As shown in FIGS. 1 and 2, the pixel 18 includes a pixel electrode 21, a TFT 22 as a switching element connected to the pixel electrode, a first storage capacitor element 23, and a second storage capacitor element 24. Yes.

  As shown in FIGS. 1, 2, and 5, a semiconductor film 31 is formed on the glass substrate 4, and a gate insulating film 32 is formed on the glass substrate and the semiconductor film. In each region overlapping with the semiconductor film 31, two gate electrodes 33 extending from a part of the scanning line 15 are formed on the gate insulating film 32. An interlayer insulating film 35 is formed on the gate insulating film 32 and the gate electrode 33.

  Signal lines 16 and contact wirings 38 are formed on the interlayer insulating film 35, and these signal lines and contact wirings are respectively connected to the semiconductor film 31 through part of the gate insulating film 32 and the interlayer insulating film. . Here, the signal line 16 and the contact wiring 38 are respectively formed in the source region RS and the drain region RD of the semiconductor film 31.

Next, the first storage capacitor element 23 and the second storage capacitor element 24 will be described.
As shown in FIG. 1, the storage capacitor line 17 and the first storage electrode 41 constitute a first storage capacitor element 23, and the storage capacitor line and the second storage electrode 43 constitute a second storage capacitor element 24, respectively. The first storage capacitor element 23 and the second storage capacitor element 24 are connected to the storage capacitor line 17, respectively.

  As shown in FIGS. 1, 2, and 6, the storage capacitor line 17 and the first wiring 34 are formed of the same conductive film on the gate insulating film 32 formed on the glass substrate 4. In this embodiment, the storage capacitor line 17 and the first wiring 34 are formed of the same film made of aluminum. An interlayer insulating film 35 is formed on the gate insulating film 32, the storage capacitor line 17, and the first wiring 34.

  In the first storage capacitor element 23, the first storage electrode 41 overlapping the storage capacitor line 17, the first connection wiring 44 connected to the first storage electrode, and the pixel electrode 21 are formed on the interlayer insulating film 35. A second wiring 42 is formed which is connected and disposed opposite to the first wiring 34. Needless to say, the first storage electrode 41 and the storage capacitor line 17 are disposed to face each other with an interlayer insulating film 35 serving as an insulating film interposed therebetween. The first wiring 34 and the second wiring 42 function as a connectable wiring 46 that can connect the pixel electrode 21 and the first storage electrode 41.

  The first storage electrode 41 is connected to the first wiring 34 through a contact hole formed in a part of the interlayer insulating film 35. The first connection wiring 44 is formed so as to connect and disconnect the first storage capacitor element 23 and the pixel electrode 21.

  In the second storage capacitor element 24, a second storage electrode 43 that overlaps the storage capacitor line 17 and a second connection wiring 45 connected to the second storage electrode are formed on the interlayer insulating film 35. Yes. Similar to the first connection wiring 44, the second connection wiring 45 is formed so as to connect and disconnect the second storage capacitor element 24 and the pixel electrode 21.

  The first storage electrode 41, the second storage electrode 43, the first connection wiring 44, the second connection wiring 45, the second wiring 42, the contact wiring 38, and the signal line 16 are formed of the same conductive film. .

As shown in FIGS. 1, 5, and 6, a colored layer 51 is formed on the glass substrate 4 on which the TFT 22, the first storage capacitor element 23, and the second storage capacitor element 24 are formed. On the colored layer 51, a plurality of pixel electrodes 21 are formed in a stripe shape with their peripheral edges overlapping with two adjacent signal lines 16 and two storage capacitor lines 17. An alignment film 52 is formed on the coloring layer 51 and the pixel electrode 21 to constitute the array substrate 1.
As shown in FIG. 5, a counter electrode 61 and an alignment film 62 are sequentially formed on the glass substrate 5 to constitute the counter substrate 2.

Next, a more detailed configuration of the above-described liquid crystal display device will be described together with its manufacturing method.
In the array substrate 1, a glass substrate 4 is prepared. An array pattern such as the wiring described above is formed on the glass substrate 4. In the counter substrate 2, a glass substrate 5 is prepared. The predetermined pattern described above is formed on the glass substrate 5. The array substrate 1 and the counter substrate 2 are arranged to face each other with a columnar spacer 6, and the peripheral portions of these substrates are bonded together with a sealing material 7. Then, liquid crystal is injected between both substrates through a liquid crystal injection port (not shown) formed in the sealing material 7. Thereafter, the liquid crystal injection port is sealed with a sealing material. As a result, the liquid crystal layer 3 is held between the array substrate 1 and the counter substrate 2.

Subsequently, the above-described pixel 18 is inspected for the presence of point defects, and the process proceeds to a repair process for repairing the point defect pixels.
As shown in FIG. 1, FIG. 4, and FIG. 7, first, when the repair process is started in step S1a, the scan line drive circuit 12, the signal line drive circuit 13, and the storage capacitor line drive circuit 14 are passed through in step S2a. A voltage is applied to each of the scanning line 15, the signal line 16, and the storage capacitor line 17 to charge the pixel portion 11. Then, the presence or absence of a point defect in each pixel 18 is inspected. When charging the pixel unit 11, for example, a black display potential or a white display potential is applied to all the storage capacitor lines 17. In this embodiment, a white display potential is applied to all the storage capacitor lines 17 during black display. As a result, each pixel is displayed in black, but only the point-defective pixel is displayed in white because light from the backlight is lost.

  As described above, the point-defective pixel 18 is different from the display color of other pixels, such as white display during black display. Therefore, the presence / absence of a point defect can be determined by the white / black display described above. Here, in this embodiment, since it is assumed that several point-defective pixels are generated by millions of pixels, the point-defective pixels are the first storage capacitor element 23 and the second storage capacitor. It is considered that one of the capacitive elements 24 is short-circuited.

  In step S3a, it is determined whether or not there is a point defective pixel. If there is no point defective pixel, the repair process is terminated in step S8a. When there is a point defect pixel, as shown in FIGS. 8 and 9, the first connection wirings 44 of all the pixels in which the point defect has occurred are cut (step S4a). When cutting, for example, the first connection wiring 44 is irradiated with laser from the back side of the array substrate, and the first cutting portion 47 is formed in the first connection wiring 44. Thereafter, in step S5a, the presence or absence of a point defect in each pixel 18 is reinspected. Subsequently, in step S6a, the presence / absence of a point defect pixel is determined again. If there is no point defect pixel, the repair process is terminated (step S8a).

  When the point defective pixel remains, as shown in FIGS. 10 and 11, the second connection wiring 45 of all the pixels in which the point defect is generated is cut, and the first wiring 34 and the second wiring 42 are connected. They are connected to each other (step S7a). At this time, the second connection wiring 45 is cut by irradiating a laser to form a second cut portion 48. Further, the first wiring 34 and the second wiring 42 are irradiated with laser to connect the first wiring 34 and the second wiring 42 to each other.

As a result, the short-circuited second storage capacitor element 24 is disconnected from the pixel electrode 21, and the first storage capacitor element 23 is connected to the pixel electrode again. Therefore, each pixel electrode 21 is connected to at least one normal storage capacitor element, and a point defect is repaired.
Through the above process, the repair process is completed (step S8a), and a liquid crystal display device is obtained.

  According to the liquid crystal display device and the method for manufacturing the liquid crystal display device configured as described above, the first storage capacitor element 23 and the second storage capacitor element 24 can be connected to the pixel electrode 21 and can be disconnected. The connection wiring 44 and the second connection wiring 45, and the connectable wiring 46 that can connect the pixel electrode 21 and the first storage capacitor element 23 are provided. For this reason, the presence or absence of the pixel 18 in which the point defect has occurred is inspected, and when the point defect pixel is detected, first, the first connection wiring 44 is cut. Thereby, the point defect of the pixel due to the short circuit of the first storage capacitor element 23 can be repaired.

  When there is a pixel 18 in which the point defect is not eliminated even when the first connection wiring 44 is cut, the second connection wiring 45 is subsequently cut for the pixel, and the first wiring 34 and the second wiring The wiring 42 is connected. As a result, in the point defect pixel 18, even when the first connection wiring 44 connected to the good first storage capacitor element 23 is cut, the connectable wiring 46 allows the pixel electrode 21 and the first storage wiring 44 to be connected. The capacitor element 23 can be connected well. For this reason, the pixel electrode 21 can be connected to at least one of the first storage capacitor element 23 and the second storage capacitor element 24.

  In the case of the repaired pixel 18 in which the pixel electrode 21 is connected to only one of the storage capacitor elements described above, the capacity stored in the storage capacitor element is half that of the unrepaired pixel. However, if the leak components of the TFT 22 and the liquid crystal layer 3 are small, the operation is almost normal. Further, in practice, it is very difficult to find a difference in capacitance from surrounding pixels even if there is some leakage. For this reason, the repaired pixel does not cause a point defect that causes a problem.

  When the first connection wiring 44 and the second connection wiring 45 are cut, and when the first wiring 34 and the second wiring 42 are connected, laser irradiation is performed. For this reason, even when the laser is irradiated after the array substrate 1 and the counter substrate 2 are bonded together, the point defect pixel 18 can be repaired. Further, even when the laser is irradiated through the colored layer 51, the point defect pixel 18 can be repaired by setting the irradiation condition.

  The storage capacitor line 17 and the first wiring 34 are formed of the same conductive film, and the first storage electrode 41, the second storage electrode 43, the first connection wiring 44, the second connection wiring 45, the second wiring 42, and the contact. The wiring 38 and the signal line 16 are formed of the same conductive film. Therefore, the connectable wiring 46 having the first wiring 34 and the second wiring 42 can be formed without increasing the number of manufacturing steps.

The first wiring 34 is made of aluminum. For this reason, when the laser is irradiated to the place where the first wiring 34 and the second wiring 42 face each other, the first wiring and the second wiring can be connected well. The above-described effect is obtained not only by the first wiring 34 but also by forming the first wiring or the second wiring 42 from aluminum (when two kinds of metal wiring having an insulating layer between layers are connected by a laser. If at least one of them is made to contain aluminum or an alloy thereof, connection is easy).
From the above, a liquid crystal display device with a high product yield and a method for manufacturing the liquid crystal display device can be obtained, so that it can flow out as a product.

Next, a liquid crystal display device and a method for manufacturing the liquid crystal display device according to another embodiment of the present invention will be described. First, the liquid crystal display device according to this embodiment will be described.
As shown in FIG. 12, the first storage capacitor line drive circuit 14a and the second storage capacitor line drive circuit 14b are provided on the glass substrate 4 in addition to the pixel portion 11, the scanning line drive circuit 12, and the signal line drive circuit 13. It has been.

  In the pixel unit 11, on the glass substrate 4, in addition to the plurality of scanning lines 15 and the plurality of signal lines 16, the plurality of first storage capacitor lines 17 a and the plurality of second storage capacitor lines 17 b parallel to the scan lines. Is formed. The plurality of first storage capacitor lines 17a are connected to the first storage capacitor line drive circuit 14a, and the plurality of second storage capacitor lines 17b are connected to the other second storage capacitor line drive circuit 14b. Therefore, the first storage capacitor line 17a and the second storage capacitor line 17b can be controlled independently at different potentials.

  In this embodiment, a pixel 18 is formed in a region surrounded by two adjacent signal lines 16, a first storage capacitor line 17a, and a second storage capacitor line 17b.

Next, one pixel 18 is taken out and described in detail.
As shown in FIGS. 13 and 14, the glass substrate 4 includes the TFT 22 as shown in FIGS. 5 and 6 except for the storage capacitor line 17 and the first wiring 34 described above, up to the interlayer insulating film 35. It is formed similarly.

Next, the first storage capacitor element 23 and the second storage capacitor element 24 will be described.
On the interlayer insulating film 35, the signal line 16, the contact wiring 38, the first storage electrode 41 and the second storage electrode 43 that overlap the first storage capacitor line 17a, and the second storage capacitor line 17b that overlaps the second storage capacitor line 17b. One storage capacitor line and a second storage capacitor line are formed.

  In addition, a first connection wiring 44 connected to the first storage electrode 41 and a second connection wiring 45 connected to the second storage electrode 43 are formed on the interlayer insulating film 35. Needless to say, the first storage electrode 41 and the second storage electrode 43 are disposed opposite to the first storage capacitor line 17a and the second storage capacitor line 17b, respectively.

  The first connection wiring 44 connects the first storage electrode 41 and the pixel electrode 21 and is formed so as to be cut off. The second connection wiring 45 is connected to the pixel electrode 21 via the second storage electrode 43 and the contact wiring 38 and can be cut. The first storage electrode 41, the second storage electrode 43, the first connection wiring 44, the second connection wiring 45, the contact wiring 38, and the signal line 16 are formed of the same conductive film. As shown in FIG. 13, for example, the second storage capacitor line 17b and the first storage electrode 41 described above are the first storage capacitor element 23, and the first storage capacitor line 17a and the second storage electrode 43 are the second storage capacitor element. 24 respectively.

A colored layer 51 is formed on the glass substrate 4 on which the TFT 22, the first storage capacitor element 23, and the second storage capacitor element 24 are formed. On the colored layer 51, a plurality of pixel electrodes 21 are formed in a stripe shape with the peripheral edges of the two adjacent signal lines 16 and the adjacent first storage capacitor line 17a and second storage capacitor line 17b. . In this embodiment, the pixel electrode 21 is connected to a first storage capacitor element 23 and a second first storage capacitor element 24 each having a different first storage capacitor line 17a and second storage capacitor line 17b. . An alignment film 52 is formed on the coloring layer 51 and the pixel electrode 21 to constitute the array substrate 1.
The counter substrate 2 is configured by sequentially forming a counter electrode and an alignment film on the glass substrate 5.

Next, a more detailed configuration of the above-described liquid crystal display device will be described together with its manufacturing method.
As described above, the array substrate 1 and the counter substrate 2 on which a specific pattern is formed are arranged to face each other while holding a predetermined gap, and the peripheral portions of these substrates are bonded together with a sealing material. After injecting liquid crystal between both substrates by a liquid crystal injection port formed in a part of the sealing material, the liquid crystal injection port is sealed with a sealing material.

Subsequently, the above-described pixel 18 is inspected for the presence of point defects, and the process proceeds to a repair process for repairing the point defect pixels.
As shown in FIGS. 12, 13, and 15, first, when the repair process starts in step S1b, in step S2b, the scanning line drive circuit 12, the signal line drive circuit 13, and the first storage capacitor line drive circuit 14a. In addition, a voltage is applied to the scanning line 15, the signal line 16, the first storage capacitor line 17 a, and the second storage capacitor line 17 b through the second storage capacitor line driving circuit 14 b to charge the pixel portion 11 with charges. At this time, during black display, white display potentials are applied to the plurality of first storage capacitor lines 17a and the plurality of second storage capacitor lines 17b, respectively.

  That is, each pixel 18 is inspected by applying a white display potential during black display and a black display potential during white display to the first storage capacitor line 17a and the second storage capacitor line 17b. Each pixel is displayed in black, but only the point-defective pixel is displayed in white because light from the backlight is lost. Therefore, the presence / absence of a point defect can be determined by the white / black display described above. When there is a pixel 18 that displays white during black display, it is considered that the first storage capacitor element or the second storage capacitor element of the pixel is short-circuited.

  In step S3b, it is determined whether or not there is a point defect pixel. If there is no point defect pixel, the repair process is terminated in step S9b. When there is a point defect pixel, in step S4b, different potentials are applied to the first storage capacitor line 17a and the second storage capacitor line 17b to reexamine the pixel.

  In step S5b, it is determined whether the short-circuited storage capacitor element is connected to the first storage capacitor line 17a or the second storage capacitor line 17b. For example, in the case of a point defect pixel in which the second storage capacitor element 24 (FIG. 13) having the first storage capacitor line 17a is short-circuited, as shown in FIG. 16, the second connection of the pixel in which the point defect has occurred. The wiring 45 is cut (step S6b). When cutting, the second connection wiring 45 is irradiated with laser, and the second cutting portion 48 is formed in the second connection wiring 45.

  Thereafter, in step S8b, the presence / absence of a point defect pixel is determined again. If there is no point defect, the repair process is terminated (step S9b). If there is a point defect pixel, the process returns to step S4b, the pixel is inspected again by applying different potentials to the first storage capacitor line 17a and the second storage capacitor line 17b, and then again the first storage capacitor line 17a having the first storage capacitor line 17a. 2. It is determined whether the storage capacitor element 24 (FIG. 13) is short-circuited (step S5b).

  For example, in the case of a point defect pixel in which the first storage capacitor element 23 (FIG. 13) having the second storage capacitor line 17b is short-circuited, as shown in FIG. 17, the first connection of the pixel in which the point defect has occurred. The wiring 44 is cut (step S7b). When cutting, the first connection wiring 44 is irradiated with laser, and the first cutting portion 47 is formed in the first connection wiring 44.

Subsequently, in step S8b, the presence / absence of a point defect pixel is determined again. If there is a point defect, the process proceeds to step S4b, and if there is no point defect, the process proceeds to step S9b.
Through the above process, the repair process is completed (step S9b), and a liquid crystal display device is obtained.

  According to the liquid crystal display device and the method of manufacturing the liquid crystal display device configured as described above, the first storage capacitor element 23 and the second storage capacitor element 24 having different storage capacitor lines, the pixel electrode 21, Are connected to each other. For this reason, the first storage capacitor element 23 and the second storage capacitor element 24 of the pixel 18 in which the point defect is generated are obtained by inspecting the potentials of the first storage capacitor line 17a and the second storage capacitor line 17b while changing each other. It is possible to determine which is short-circuited. Therefore, in the point defect pixel 18, for example, by cutting only the first connection wiring 44 that connects the short-circuited first storage capacitor element 23 and the pixel electrode 21, the first storage capacitor element is short-circuited. Pixel point defects can be repaired. The plurality of first storage capacitor lines 17a and the plurality of second storage capacitor lines 17b do not need to be connected to one drive circuit, and may be connected to two or more drive circuits.

  The present invention is not limited to the above-described embodiment, and can be variously modified within the scope of the present invention. For example, the repair process can be performed before the liquid crystal is injected between the array substrate 1 and the counter substrate 2. For example, the repair process may be performed after the pixel electrode 21 is formed. Although each pixel electrode 21 is connected to two storage capacitor elements, the first storage capacitor element 23 and the second storage capacitor element 24, each pixel electrode 21 may be connected to three or more storage capacitor elements. . In this case, in the above-described embodiment, the point-defective pixel 18 cuts the second connection wiring 45 (FIG. 7, step S7a), but the first connection until the short-circuited storage capacitor element and the pixel electrode are disconnected. One or more connection wirings other than the wiring 44 may be cut off. If a plurality of TFTs 22 are installed to avoid point defects of the TFTs, or the pixel electrode 21 is divided into a plurality of parts and a short circuit between the pixel electrode and the counter electrode 61 is repaired, a point defect is also used. Is further repaired, and the point defect relief rate is increased due to a synergistic effect. In the above-described embodiment, the liquid crystal display device has been described as an example. However, the display device is not limited to the liquid crystal display device, and may be another display device such as an EL (Electro-Luminescent) display device.

The top view which expands and shows a part of array substrate which concerns on embodiment of this invention. FIG. 2 is an equivalent circuit diagram of the array substrate shown in FIG. 1. Sectional drawing of the liquid crystal display device which has the array substrate shown in FIG. FIG. 4 is a plan view of the array substrate shown in FIGS. 1 and 3. FIG. 2 is a cross-sectional view taken along the line AA of the liquid crystal display device illustrated in FIG. 1. BB sectional drawing of the array substrate shown in FIG. 6 is a flowchart of manufacturing the liquid crystal display device shown in FIG. FIG. 2 is a plan view of the array substrate showing a state where the connection wiring shown in FIG. 1 is cut. FIG. 9 is an equivalent circuit diagram of the array substrate shown in FIG. 8. FIG. 2 is a plan view of an array substrate showing a state where a pixel electrode and a storage capacitor element are connected by a connectable wiring shown in FIG. 1. FIG. 11 is an equivalent circuit diagram of the array substrate shown in FIG. 10. The top view of the array board | substrate which concerns on other embodiment of this invention. FIG. 13 is an enlarged plan view showing a part of the array substrate shown in FIG. 12. FIG. 14 is an equivalent circuit diagram of the array substrate shown in FIG. 13. 14 is a flowchart of manufacturing the liquid crystal display device shown in FIG. FIG. 14 is a plan view of an array substrate showing a state in which one connection wiring shown in FIG. 13 is cut. FIG. 14 is a plan view of the array substrate showing a state in which the other connection wiring shown in FIG. 13 is cut.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Array substrate, 2 ... Opposite substrate, 3 ... Liquid crystal layer, 4, 5 ... Glass substrate, 17 ... Storage capacitor line, 17a ... First storage capacitor line, 17b ... Second storage capacitor line, 21 ... Pixel electrode, 23 ... 1st storage capacitor element, 24 ... 1st storage capacitor element, 34 ... 1st wiring, 35 ... Interlayer insulation film, 41 ... 1st storage capacitor line, 42 ... 2nd wiring, 43 ... 2nd storage capacitor line, 44 ... 1st connection wiring, 45 ... 2nd connection wiring, 46 ... Connection possible wiring, 47 ... 1st cutting part, 48 ... 2nd cutting part.

Claims (11)

A plurality of pixel electrodes, and a plurality of storage capacitor elements connected to the pixel electrodes,
Connecting each of the pixel electrodes and the plurality of storage capacitor elements and connecting a plurality of connection wirings that can be cut off, and at least one of the plurality of storage capacitor elements connected to the pixel electrodes and one pixel electrode And a connectable wiring that can be connected.   The connectable wiring has a first wiring and a second wiring arranged to face each other through an insulating film, the first wiring being connected to a storage capacitor element, and the second wiring being connected to a pixel electrode. The display device according to claim 1.   The plurality of storage capacitor elements each have a storage capacitor line and a storage electrode arranged to face each other via an insulating film, and the storage capacitor line and the first wiring are formed of the same conductive film. The display device according to claim 2.   The plurality of storage capacitor elements each have a storage capacitor line and a storage electrode arranged to face each other through an insulating film, and the storage electrode, the connection wiring, and the second wiring are formed of the same conductive film. The display device according to claim 2, wherein:   The display device according to claim 2, wherein the first wiring or the second wiring is formed of aluminum. At least one storage capacitor among a plurality of pixel electrodes, a plurality of storage capacitor elements connected to each pixel electrode by a plurality of connection wirings that can be cut off, and a storage capacitor element connected to the one pixel electrode A first storage capacitor line connected to the element and a second storage capacitor line connected to the remaining storage capacitor element;
The display device, wherein the plurality of first storage capacitor lines and the plurality of second storage capacitor lines are independently controlled at different potentials. A plurality of pixel electrodes and a plurality of storage capacitor elements connected to the pixel electrodes, and a plurality of connection wirings that connect and disconnect each of the pixel electrodes and the plurality of storage capacitor elements, In a method for manufacturing a display device, comprising: a connectable wiring that can connect each pixel electrode and at least one of a plurality of storage capacitor elements connected to one pixel electrode;
Check the presence or absence of point defects due to short circuit of the storage capacitor element by changing the potential of the storage capacitor line,
Of the plurality of storage capacitor elements connected to the pixel electrode where the point defect has occurred, cut the connection wiring of the storage capacitor element connected to the connectable wiring,
Reexamine the presence or absence of point defects at the location where the connection wiring is cut,
When a point defect occurs at the reexamined location, among the storage capacitance elements connected to the pixel electrode at the location where the point defect occurs, a storage capacitance other than the storage capacitance element connected to the connectable wiring A method for manufacturing a display device, comprising: connecting the storage capacitor element and the pixel electrode by using the connectable wiring after disconnecting an element connection wiring. At least one storage capacitor among a plurality of pixel electrodes, a plurality of storage capacitor elements connected to each pixel electrode by a plurality of connection wirings that can be cut off, and a storage capacitor element connected to the one pixel electrode A first storage capacitor line connected to the element and a second storage capacitor line connected to the remaining storage capacitor element, wherein the plurality of first storage capacitor lines and the plurality of second storage capacitor lines are: In a manufacturing method of a display device that is independently controlled at different potentials,
Check for the presence of point defects due to short circuit of the storage capacitor element,
In the case where a point defect has occurred, the short-circuited storage capacitor element is connected to the first storage capacitor line and the second storage capacitor line at a location where different potentials are applied to the first storage capacitor line and the second storage capacitor line. Which storage capacitor is connected to
A method for manufacturing a display device, comprising: cutting a connection wiring connected to the storage capacitor element determined to be short-circuited. When determining whether the short-circuited storage capacitor element has the first storage capacitor line or the second storage capacitor line at the point where the point defect occurs.
During black display, a white display potential is applied to one of the first storage capacitor line and the second storage capacitor line, and a black display potential is applied to the other.
When changing to white display, it is determined that the first storage capacitor line or the second storage capacitor line to which the white display potential is applied has a storage capacitor that is short-circuited;
When the black display is maintained, it is determined that the first storage capacitor line or the second storage capacitor line to which the black display potential is applied has a short-circuited storage capacitor element. 9. A method for manufacturing the display device according to 8. A transparent substrate is prepared, and the storage capacitor element, connection wiring, and pixel electrode are formed on the substrate to form an array substrate,
Prepare another transparent substrate, use that substrate to form the counter substrate,
Bonding the array substrate and the counter substrate,
10. The method of manufacturing a display device according to claim 7, wherein after the liquid crystal is injected between the array substrate and the counter substrate, the presence or absence of a point defect is inspected.   The method of manufacturing a display device according to claim 7, wherein the connection wiring is cut by irradiating the connection wiring with a laser.

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