Abstract:
An array substrate comprising: a first insulator film arranged to insulate scanning and control lines from signal lines; switching elements, each of which is arranged in vicinity of respective intersection of the scanning and signal lines; a second insulator film that covers a multi-layer wiring pattern including the scanning and control lines and the signal lines; pixel electrodes, each of which is electrically connected to respective one of the signal lines through the respective switching element; island metal patterns, each of which is arranged to at least partly overlap the control line and is electrically connected with the respective switching element; a wiring breakage that separates one of the signal lines into two wiring parts; and bridge wirings, which connect said two wiring parts by way of one of the island metal patterns and are arranged to overlap the pixel electrodes as interposed by the second insulator film therebetween.

Description:
CROSS-REFERENCE TO RELATED APPLICATION 
       [0001]    This application is based upon and claims the benefit of priority from the prior Japanese Patent Application No. 2007-225454, filed on Aug. 31, 2007; the entire contents of which are incorporated herein by reference. 
       FIELD OF THE INVENTION 
       [0002]    This invention relates to an array substrate used in a flat-panel display device, as typified by a liquid-crystal display (LCD) device and Organic Electro-Luminescence (OEL or OLED) display device, and a manufacturing method of the array substrate. The invention particularly relates to the array substrate having been undergone repairing of wire breakage as to curb a line defect on a screen, which would be caused by a wire breakage in a pixel-array area. 
       BACKGROUND ART 
       [0003]    Recently, liquid crystal display devices and other flat-panel display devices are used in various fields as image display devices for personal computers, word processor-dedicated machines, television set or the like as well as for a projector display device; in view of their small depth dimension and small weight as well as small electric power consumption. 
         [0004]    Active-matrix liquid crystal display (active-matrix LCD) devices in particular, which has pixel-switching elements arranged on each display pixel electrode, enables to achieve good image quality without crosstalk between adjacent pixels. Because of these features, active-matrix LCD devices are being earnestly investigated and developed. 
         [0005]    In following, a light transmissive one of the active-matrix LCD devices is exemplified for explaining its construction. 
         [0006]    An active-matrix LCD device is comprised of a matrix array substrate (hereinafter referred as array substrate) and a counter substrate, which are closely opposed to each other with a predetermined gap, and of a liquid crystal layer held in the gap. 
         [0007]    The array substrate has signal lines and scanning lines, which are arranged in a matrix form on an insulator substrate such as a glass plate, and are overlapped to sandwich an insulator film. On each rectangular patch defined by the signal and scanning lines, a pixel electrode is disposed and formed of a transparent electro-conductive material such as Indium-doped tin oxide (ITO). At around each crossing of the signal and scanning lines, a pixel-switching element is disposed for controlling a respective pixel electrode. When the pixel-switching element is a thin film transistor (TFT), gate and signal electrodes of the TFT are respectively connected with scanning and signal lines; and a source electrode of the TFT is connected with a pixel electrode. 
         [0008]    The counter substrate has a counter electrode formed of a transparent electro-conductive material such as indium-doped tin oxide (ITO), on an insulator substrate such as a glass plate. When to realize color display, color filter layers are formed on the array or counter substrate. 
         [0009]    In manufacturing of such array substrate, foreign particles might occasionally adhere on a film at a time of forming the film for wiring patterns; and a pin hole might occasionally be formed on resist pattern due to the foreign particles or the like at a time of coating the resist resin or of lithographic exposure. Resultantly, a wire breakage might be formed on any of the signal or scanning lines. Such wire breakage causes a line defect on the screen, and thus may cause a decrease in a ratio of shippable goods among whole of products. Thus, various ways for repairing the wire breakage has been adopted in trials. For example, JP1999 (H11)-260819A (Japan&#39;s Kokai or patent application publication No. H11-260819) shows a method of forming a repairing wire pattern by applying of positive or negative photoresist resin and a spot exposure for its patterning. Such method requires a series of processes including a layer formation and a patterning; and thus repairing processes are complicated and sufficient decrease of the repairing is not achievable. 
         [0010]    JP1993(H05)-066416A (Japan&#39;s Kokai or patent application publication No. H05-066416) proposes using of a laser CVD technique in repairing the wire breakage by a simple process. Contact holes are formed in places sandwiching the wire breakage, and then a repair pattern is formed by the laser CVD as to cover an area of the wire breakage and run in a direction of a wire having the wire breakage. This method is not applicable when laser irradiation causes deterioration in a layer at underneath, such as an alteration in nature of a semiconductor layer. This method has a further drawback in that the repair pattern is susceptible to short circuiting with neighboring pixel electrodes, when to repair a wire breakage on a signal line for example. This is due to diffusion of laser beams and metals, which causes a certain thin metal layer around an intended area for forming the repair pattern and thereby causes short-circuiting with nearby pattern of conductive layer. 
         [0011]    In view of the above, some methods of forming a bypass wiring that detours a vicinity of the wire breakage have been proposed, by WO03/081329 and JP-2003-280021A (Japan&#39;s patent application publication No. 2003-280021) for example. WO03/081329 proposes forming a cut-out on a pixel electrode in vicinity of the wire breakage after forming the pair of contact holes on wiring portions sandwiching the wire breakage; and then, arranging the bypass wiring within the cut-out. Meanwhile, JP-2003-280021A proposes forming, by use of the CVD technique, a pair of bridge wirings that extend from wiring portions sandwiching the wire breakage to a pixel electrode in vicinity of the wire breakage, so as to form a kind of a bypass wiring formed of the pixel electrode and the pair of bridge wirings. In this method, the pixel electrode forming the bypass wiring is cut out from an electrode of the TFT; and the pair of contact holes is also formed on the wiring portions sandwiching the wire breakage. These conventional methods of repairing the wire breakage have a drawback in that unwanted short circuiting might be made between the repair pattern and neighboring pixel electrode because it is necessary to form the pair of contact holes by laser cutting and then form the bypass wiring. 
         [0012]    In view of the above drawback, it is aimed to curb the unwanted short circuiting and facilitate the repairing, in manufacturing of the array substrate for display device. 
       BRIEF SUMMARY OF THE INVENTION 
       [0013]    An array substrate of an aspect of the invention is comprised of: a plurality of scanning lines and control lines substantially in a parallel arrangement; a plurality of signal lines that are arranged perpendicularly to the scanning and control lines, with a first insulator film arranged to insulate the scanning and control lines from the signal lines; switching elements, each of which is arranged in vicinity of respective intersection of the scanning and signal lines and has an electrode terminal electrically connected with respective one of the signal lines; a second insulator film that covers a multi-layer wiring pattern including the scanning and control lines and the signal lines; pixel electrodes, which are arranged in a matrix form and each of which is electrically connected to another electrode terminal of the respective switching element; island metal patterns, each of which is arranged to at least partly overlap the control line and is electrically connected with said another electrode terminal of the respective switching element; a wiring breakage that separates one of the signal lines into two wiring parts; and bridge wirings, which connect said two wiring parts by way of one of the island metal patterns and are arranged to overlap the pixel electrodes as interposed by the second insulator film therebetween. 
         [0014]    A manufacturing method of an array substrate according to an aspect of the invention, is comprised of: forming a multi-layer wiring pattern that include; a plurality of scanning lines and control lines substantially in a parallel arrangement; a plurality of signal lines that are arranged perpendicularly to the scanning and control lines, with a first insulator film arranged to insulate the scanning and control lines from the signal lines; switching elements, each of which is arranged in vicinity of respective intersection of the scanning and signal lines and has an electrode terminal electrically connected with respective one of the signal lines; and island metal patterns, each of which is arranged to at least partly overlap the control line and is electrically connected with said another electrode terminal of the respective switching element; forming a second insulator film that covers the multi-layer wiring pattern; forming pixel electrodes on the second insulator film, which are arranged in a matrix form and each of which is electrically connected to another electrode terminal of the respective switching element; and checking of electrical continuity of each of the signal lines before forming the second insulator film, to find out a wiring breakage that separate one of the signal lines into two wiring parts; and forming first and second bridge wirings that run respectively from said wiring parts to one of the island metal patterns, which is adjacent to the wire breakage, if and when the wire breakage is found out at said checking. 
         [0015]    By the above, repairing of wire breakage on any of the signal lines is easily made even if the wiring breakage is positioned to be prone to make short circuiting with an adjacent pixel electrode. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWING  
         [0016]      FIG. 1  is a plan view showing a construction of each pixel dot on an array substrate of first embodiment; 
           [0017]      FIG. 2  is a sectional view of the array substrate of the first embodiment, schematically showing multi-layer structure at a TFT and wiring patterns connected to the TFT; 
           [0018]      FIG. 3  is a sectional view of the array substrate of the first embodiment, schematically showing multi-layer structure at a plane intersecting a second bridge wiring, an island metal pattern and a storage capacitor line; 
           [0019]      FIG. 4  is a sectional view of the array substrate of the first embodiment, schematically showing multi-layer structure at a plane intersecting a signal line, a first bridge wiring and two contact holes; 
           [0020]      FIG. 5  is a sectional view of the array substrate of the first embodiment, schematically showing multi-layer structure at a plane intersecting a third bridge wiring, a island metal pattern and a storage capacitor line; and 
           [0021]      FIG. 6  a plan view corresponding to  FIG. 1 , showing a construction of each pixel dot on an array substrate of second embodiment. 
       
    
    
     DETAILED DESCRIPTION OF THE INVENTION 
     First Embodiment 
       [0022]    An array substrate and its manufacturing method of first embodiment of the invention will be described with reference to  FIGS. 1 through 5 . Exemplified in following explanation is an array substrate for a transmission liquid crystal display device, which has poly-crystalline silicone (p-Si: to be referred as polysilicone) TFTs for respective pixel electrodes as switching elements. The explanation is made for a case where a wire breakage  31 A of one of signal lines  31  is occurred in a position at which the one signal line  31  crosses over a storage capacitor line  22 , due to a foreign particle or the like at a time of lithographic exposure for forming a resist pattern, and is repaired. 
         [0023]      FIG. 1  shows a construction of each pixel dot on the array substrate. Scanning lines  21  perpendicularly intersect signal lines  31  as to form a matrix or lattice form; and a TFT  7  is formed on each intersection of the scanning and signal lines. A storage capacitor (Cs) line  22  having a relatively large width is arranged along and in vicinity of each of the scanning lines  21 ; and a pixel electrode  31  having a substantially rectangular shape is arranged in a matrix form as to substantially match each pixel-dot aperture that is a rectangular patch defined by the signal lines  31  and the storage capacitor lines  22 . All-around fringe of the each pixel electrode overlaps, at its every side of the rectangular shape, with a fringe portion of any of the signal lines  31  and the storage capacitor lines  22 , as to enhance aperture ratio or an areal ratio of the pixel-dot aperture to each pixel-dot area. 
         [0024]    On first hand, construction on each pixel dot is explained other than pixel dots having a repaired portion. The each pixel electrode  6  has a pixe-electrode extension  51  that is extended from a center part of a fringe of the pixel electrode  6  in which; the fringe overlaps the storage capacitor line  12  in vicinity of a TFT  7  associated with the very pixel electrode  6 ; the center part of the fringe is major part of the fringe as distanced from the signal lines  31 ; and the pixe-electrode extension  51  overreaches a center line of the storage capacitor line  12 . The pixe-electrode extension  61  and the metal island pattern  32 , which is nearer to bottom, overlap with each other as to sandwich a thick resin film  5  between them; and are electrically connected with each other by way of a contact hole  51  perforating the thick resin film  5 . Each of the metal island patterns  32  has an L-shaped extension  33 , which stretches into inner and non-fringe part of a pixel-dot aperture and is formed of; a proximal linear part  33 C that runs in a direction of the signal lines  31 ; and a distal linear part  33 B that runs from end of the proximal linear part  33 C as turned into a direction of the scanning lines  21  as to stretch away from the TFT  7 . The L-shaped extension  33  has, at its turning point or its angled portion, a contact hole  27  perforating an interlayer insulator film  25  and gate insulator film  15 ; and is electrically connected with a source electrode of the TFT  7  by way of the contact hole  27  and a polysilicone wiring  14 C. Thus, the pixel electrode  6  is electrically connected with the source electrode of the TFT  7  by way of the metal island pattern  32  and the polysilicone wiring  14 C. 
         [0025]    Drain electrode of the TFT  7  is electrically connected with the signal line  31  by way of a polysilicone wiring  14 A and a contact hole  26 , which perforates the gate and interlayer insulator films  15 ,  25  at within a contour of the signal line  31 . In an illustrated example, the contact hole  26  is positioned as spaced apart from the TFT  7 ; and the polysilicone wiring  14 A runs along the signal line  31  toward a nearest one of the scanning lines  21  and then turned into the direction of the scanning lines  21 . In each of the TFTs  7 , which is of a top-gate construction as shown in  FIGS. 1-2 , two gate electrodes respectively formed of the scanning line  21  itself and its branch  21   a  are intersected with a polysilicone wiring  14 . Channel regions of the TFTs are formed at portions overlapping the gate electrodes, within a contour of the polysilicone wiring  14 . The polysilicone wiring  14  is formed of; the polysilicone wirings  14 A and  14 C; as well as a polysilicone wiring  14 B that is interposed between two channel regions  11  and  11   a.  A polysilicone island pattern  12  in a rectangular shape is arranged to be nearly congruent with each segment, of the storage capacitor line  22 , sandwiched by the signal lines  31 . Each of the polysilicone island patterns  12  overlaps the storage capacitor line  22  as to sandwich the gate insulator film  15 , and has a linear extension  13  extended into the pixel-dot aperture, toward its inner area. As shown in  FIG. 1 , a distal end of the linear extension  13  is overlapped and electrically connected with a distal end of the L-shaped extension  33  of the metal island pattern  32 , by way of a contact hole  28  perforating the gate and interlayer insulator films  15  and  25 . Thus, the polysilicone island pattern  12  is electrically connected with the pixel electrode  6  by way of the metal island pattern  32  and serves for forming a storage capacitor for the pixel electrode  6 , in same manner as and in addition to that formed by the metal island pattern  32 . 
         [0026]    Meanwhile, a color filter is formed by and within the thick resin film  5 , which is often referred as a flattening film, on the array substrate  10 . A pattern of light-shielding film, which is often referred as “black matrix”, is not formed within a pixel-array area, on neither of the array and counter substrates, and is arranged only at between all-around fringe of the pixel-array area and a pattern of sealing material. As shown in  FIGS. 2-5 , a counter electrode  106  is formed on almost whole area of inward-coming face of the counter substrate  102 ; the array and counter substrates  10  and  102  are joined to each other as to sandwich spacers and the sealing material arranged on all-around fringe portion of the substrates. On beforehand of such joining, alignment layers  104  are formed on inward-coming faces, which are to contact with the liquid crystal layer, of the array and counter substrates  10  and  102 . On outward faces of the array and counter substrates  10  and  102 , polarizer sheets  105  are attached. 
         [0027]    In following, a construction of repaired part is explained. In a detailed embodiment, the signal lines  31  and the metal island patterns  32  are formed on first hand on the array substrate  10 , by metal layer such as aluminum; and then, a wire breakage and/or a short circuiting is detected by a known method such as using an array tester. As a more simple way, probes or other terminals may be contacted on both ends of each of the signal lines  31  as to check continuity of the signal lines  31 . It is assumed that a wire breakage  31 A of one of the signal lines  31  is detected on its intersection with the storage capacitor line  22 , as shown in  FIG. 1 . In such occasion, a bypass wiring  8 , which detours the wire breakage  31 A and connects two wiring parts  31 B and  31 C of the signal line  31 , is formed by the metal island pattern  32  and first and second bridge wirings  81  and  82 . The bridge wirings  81  and  82  are formed by laser CVD technique, after forming of the signal lines  31  and the metal island patterns  32  and on beforehand of applying of a resin for the thick resin film  5  that covers the signal lines  31  and the metal island patterns  32 . Thus, no short circuiting is occurred between the pixel electrode  6  and the bridge wirings  81  and  82 . The bridge wirings  81  and  82  are directly covers upper surfaces of the signal lines  31  and the metal island patterns  32  as to be electrically connected with them without using any contact hole. 
         [0028]    In the first embodiment, the bypass wiring  8  is formed by using the metal island pattern  32 - 1 , which has been connected with the signal line  31 - 1  having the wire breakage  31 A by way of the TFT  7 - 1 , among two of the metal island patterns  32 - 1  and  32 - 2  that are adjacent to the wire breakage  31 A. In the illustrated example, the first bridge wiring  81  is linear and in parallel with the storage capacitor line  22 , as to extend from an end of the wiring part  31 C of the signal line  31 - 1  to the angled part having the contact hole  27 , of the L-shaped extension  33  of the metal island pattern  32 - 1 . The second bridge wiring  82  is of L-shaped and consisting of; a first linear wiring part  82 A that extends in parallel with the storage capacitor line  22 , from the other wiring part  31 B of the signal line  31 - 1 ; and a second linear wiring part  82 B that extends from an end of the first linear wiring part  82 A as turned to be in parallel with the signal line  31  to reach a fringe portion of the metal island pattern  31 - 1 . Alternatively, the second bridge wiring  82  may be shaped as an arch consisting of smooth curve, and may be linear. The first bridge wiring  81  might be formed in various shapes such as an L shape in a manner as the second bridge wiring  83 . As shown in  FIG. 3  and  FIG. 1 , the second bridge wiring  82  directly covers and overlaps a portion of a fringe of the metal island pattern  32 - 1 ; and in vicinity of such overlapping, a fringe of the polysilicone island pattern  12  at underneath of the second bridge wiring  83  is surely covered by the fringe portion of the metal island pattern  32 . In other words, the fringe of the polysilicone metal pattern  12  is designed to come inward of the fringe of the metal island pattern  3 , as distanced by a margin of alignment between two patterning processes respectively for the island patterns  12 , 32 . Thus, polysilicone layer of the polysilicone island pattern  12  would not undergo deterioration or alteration, during laser CVD process. Moreover, no short circuiting is occurred with molybdenum-tungsten (Mo—W) layer of the storage capacitor line  22 . 
         [0029]    Laser-cut disconnections  91  and  92  are formed by laser evaporation technique at a stage forming the first and second bridge wiring  81  and  82 , that is; after forming of the signal lines  31  and the metal island patterns  32  and before coating of resin for forming the thick resin film  5  that covers these metal patterns. Firstly, as shown in  FIGS. 1-2 , an electric connection from TFT  7  to the metal island pattern  32  is severed by cutting the polysilicone wiring  14 C to form a laser-cut disconnection  91 . Then, as shown in  FIG. 1  and  FIG. 4 , electric connection from the polysilicone island pattern  12  to the metal island pattern  32  is severed by cutting the L-shaped extension  33  of the metal island pattern  32  at a position slightly distanced from the end of the L-shaped extension  33 , to form a laser-cut disconnection  92 . 
         [0030]    Meanwhile, as shown in  FIG. 1  and  FIG. 3 , the pixel electrode  6 - 1  having been disconnected from the TFT  7 - 1  for the repairing is subjected to laser cutting as to separate the pixel-electrode extension  61  from other part of the pixel electrode  6 - 1  and to cut through base part of the pixel-electrode extension  61 , to form a laser-cut disconnection  93 . The laser-cut disconnection  93  is to cut out, from the pixel electrode  6 - 1 , its portion contacted with the metal island pattern  32 ; and thereby sever an electric connection from the pixel electrode  6 - 1 , through the metal island pattern  32  and the first and second bridge wirings  81  and  82 , to the signal line  31 . 
         [0031]    Further, as shown in  FIG. 1  and  FIG. 5 , the pixel electrode  6 - 1  is electrically connected with the next pixel electrode  6 - 2  through third bridge wiring  83 . The third bridge wiring  83  is formed by laser CVD in a manner as in above, almost simultaneously with forming the laser-cut disconnection  93 . 
         [0032]    In following, a manufacturing process of the array substrate in this embodiment is explained in detail by way of an example. 
         [0033]    &lt;1&gt; First patterning: Firstly, by use of plasma CVD technique, a silicone oxide film and a silicone nitride film are deposited on a glass substrate  18  that appears in  FIG. 2 , as to form a two-layer film that is an undercoat layer  19  for curbing proliferation of impurity. Subsequently, by use of the plasma CVD technique, an amorphous silicone film of 50 nm thickness is deposited. Then, the glass substrate  18  is placed in a furnace so that the amorphous silicone film is subjected to a dehydrogenation process. Thereafter, melting and crystallization of the silicone film is achieved by that; whole face of the silicone film is irradiated, with excimer laser light for example. Thus obtained polysilicone film is subjected to a patterning as to form; semiconductor layers for the TFTs  7 ; and the polysilicone wirings  14 ; the polysilicone island patterns  12  arranged to overlap the storage capacitor lines  22 . 
         [0034]    &lt;2&gt; Second patterning: The plasma CVD technique is used to form a gate insulator film  15  of 100 nm thickness consisting of single layer of silicone oxide. Subsequently, a sputtering technique is used to deposit a molybdenum-tungsten alloy film (Mo—W film) of 300 nm thickness for example. Then, a patterning is made to form the scanning lines  21  in number of 768, their branches  21   a,  and storage capacitor lines  22  in the same number. 
         [0035]    &lt;3&gt; Third patterning: By use of the scanning lines  21  and their branches  21   a  as a photomask pattern, certain parts of the polysilicone wiring  14  are doped with impurity materials or doping agents by using an ion implanter of amorphous separating type. Thus, the channel regions  11  and  11   a  are formed at portions where the polysilicone wirings  14  are overlapped with the gate electrodes  21  and  21   a.  Such TFTs of coplanar configuration may be formed in detail by a method disclosed in JP-2001-339070A for example. 
         [0036]    &lt;4&gt; Fourth patterning: The CVD technique is used to form an interlayer insulator film  25  consisting of a silicone oxide film in thickness of 600 nm. Then, a patterning is made to form contact holes  26  for electrically connecting the signal lines  31  with the polysilicone wirings  14 . Simultaneously formed are contact holes  27  and  28  which expose, within an each area to be disposed of the L-shaped extension  33  of the metal island pattern  33 ; an end portion of each of the polysilicone wirings  14 ; and distal end portion of each of the linear extensions  13  of the island polysilicone pattern  12 . Although not illustrated in the drawings, also formed are contact holes for exposing terminal pads on peripheral portions of the substrate, at surroundings of the pixel-array area. 
         [0037]    &lt;5&gt; Fifth patterning: The sputtering technique is used to deposit a molybdenum-aluminum-molybdenum three-layer metal film (Mo/Al/Mo film) for example, in which an aluminum metal layer is sandwiched by top and bottom molybdenum (Mo) layers. For example, a Mo layer of 25 nm thickness, and aluminum (AL) layer of 250 nm thickness and a Mo layer of 50 nm thickness are sequentially deposited in this order. A patterning is made on the three-layer metal film as to form the signal lines  31  in number of 1024×24 as well as the island metal patterns  32 . 
         [0038]    &lt;6&gt; Continuity test and First part of repairing: Probes are contacted on the terminal pads of each of; the signal lines  31 , each of the scanning lines  21  and each of the storage capacitor lines  22 ; as to detect a wire breakage and/or a short circuiting between wirings. When the wire breakage  31 A of one of the signal lines  31  is found at a position other than crossing of the signal line  31  over the storage capacitor line  22 ; then, the wire breakage  31 A is repaired by simply connecting two wiring parts of the one signal line  31 , with laser CVD technique. When the wire breakage  31 A of one of the signal lines  31  is found at crossing of the one signal line  31 - 1  over the storage capacitor line  22 ; then, first and second bridge wirings  81  and  82  are formed by laser CVD technique, as to be extended from ends of wiring parts  31 B and  31 C sandwiching the wire breakage  31 A, of the one signal line  31 , to reach one of the metal island patterns  32 , which is adjacent to the wire breakage  31 A. 
         [0039]    Subsequently, the polysilicone wiring  14  is cut by laser cutting, at the wiring part  14 C between the scanning line  21  and the contact hole  27 . In detail, the wiring part  14 C is severed to form a laser-cut disconnection  91  at its certain position, as appeared in  FIG. 1  and  FIG. 3 ; by applying laser evaporation technique or zapping technique in a manner to remove the gate and interlayer insulator films  15  and  25  as well as the polysilicone layer of the wiring part  14 C at the certain position. Meanwhile, the L-shaped extension  33  of the metal island pattern  32  is severed at a position slightly distanced from distal end of the extension  33 , by laser cutting as in cutting of the wiring part  14 C. In detail, distal linear wiring part  33 B is severed to form a laser-cut disconnection  92  at vicinity of its center or of a middle point between the contact holes  27  and  28 ; by applying the laser evaporation technique in a manner to completely remove the three-layer metal film (Mo/Al/Mo film). 
         [0040]    &lt;7&gt; Sixth patterning: With respect to each color of red, blue and green, the substrate is uniformly coated with a light-curing resin liquid, which is formed of a colored acrylic resin or the like, at a thickness of 2 μm. This is followed by a series of processing, which includes a light exposure process by use of a photomask as to form the thick resin film  5 , which has color patterns in stripe arrangement is formed and in which each color is allotted to a row of the pixel dot apertures. The thick resin film  5  is provided with contact holes  51 , each of which is formed during the above-mentioned light exposure process or the like to an area inside of contour of the island metal pattern  32 . 
         [0041]    Alternatively, the color patterns may be formed by an ink-jet technique as follows. The substrate is uniformly coated with a colorless light-curable resin liquid, which is formed of an acrylic resin or the like, at a thickness of 2 μm. This is followed by a series of processing, which includes a light exposure process by use of a photomask as to form the thick resin film  5 . The colorless thick resin film  5  is subjected to prebaking and then to lithographic light exposure and heat treatment in a manner to achieve hydrophobization on center-line parts, widthwise center parts, of the signal lines  31  and the scanning lines  21  so that dye becomes difficult to be absorbed at the center-line parts. Thus curbed is mixing of dyes of different colors at between adjacent pixel dots. Subsequently, the dyes of red (R), blue (B) and green (G) colors are discharged on areas that have not undergone the hydrophobization to achieve coloring. Then, drying and heat treatment is made to achieve complete curing of the resin. In otherwise, curable resin liquid having been dispersed of pigments of each color may be applied on the substrate by the ink-jet technique. 
         [0042]    &lt;8&gt; Seventh patterning and Second and last part of repairing: As a transparent conductive layer, ITO layer of 150 nm thickness for example is deposited; and the patterning is made to form pixel electrodes  6  and the pixel-electrode extensions  61 , as well as ITO films covering the terminal pads, simultaneously. 
         [0043]    As for the pixel electrode  6 - 1 , which has become electrically connected with the one signal line  31 - 1  at the first part of repairing; following manner of repairing is further made. On first hand, at a pixel dot in which the one metal island pattern  32 - 1  serves as a part of the bypass wiring  8 , the pixel-electrode extension  61  that overlaps the one metal island pattern  32 - 1  is cut out from other part of the pixel electrode  6 - 1 , by the laser evaporation technique. Namely, the pixel-electrode extension  61  is cut through at its base portion as to cut out almost whole of the pixel-electrode extension  61  from the other part, by removing the ITO film with the laser evaporation technique. Thus formed laser-cut disconnection  93  on the pixel electrode  6  severs an electrical connection from the pixel electrode  6 , through the bridge wirings  81  and  82  and the metal island pattern  32 , to the signal line  31 - 1 . 
         [0044]    Subsequently, a third bridge wiring  83  that electrically connects the one pixel electrode  6 - 1  having been disconnected from the TFT  7 - 1 , with any one of the pixel electrodes  6  that are adjacent to the one pixel electrode  6 - 1 , by the laser CVD technique. In a preferred embodiment illustrated in the drawings, the one pixel electrode  6 - 1  is electrically connected with a “prior-row” pixel electrode  6 - 2 ; which is next to the one pixel electrode  6 - 1  in a row along the signal line  3 - 1  and is positioned on a side opposite to the TFT  7 - 1  of the one pixel electrode  6 - 1  and opposite to the bypass wiring  8 . Here, it is assumed that polarity between the one and “prior-row” pixel electrodes  6 - 1  and  6 - 2  is same and thus, similar signals are inputted to them. Alternatively, the one pixel electrode  6 - 1  may be connected with other one among the pixel electrodes  6  next to the one pixel electrode  6 - 1 ; that is, with one on right-hand side or left-hand side in  FIG. 1 , or with one on a “latter row” in view of a sequence of applying scanning pulse, unless display visibility of the pixel dot is undermined. 
         [0045]    In following, concrete examples on applying of the laser CVD and laser evaporation techniques are described. For depositing a conductive layer by the laser CVD technique, adopted light source of the laser beams is Nd +3 :YLF and its third harmonic wave at 349 nm is used. When forming the first, second and third bridge wirings  81 - 83 , so as to locally deposit tungsten (W) metal, a tungsten-containing carbonyl compounds such as W(CO) 6  is adopted as a source gas while argon (Ar) gas is used as carrier gas. For example, adopted laser beams is of continuous oscillation at energy level of more than 100 mW (4 kHz) as to form metal layer having 0.3 μm thickness. Width of the bridge wirings  81  and  82  is set to become about 5 μm that is almost same with that of the signal lines  31 . Using of the tungsten-containing carbonyl compounds as in above concrete example is preferred, because achieved are high efficiency of decomposition and deposition under laser beams as well as excellent stability in film formation. Nevertheless, other source gas such as chrome carbonyl or the like may be used in some occasions. Thus, the bridge wirings  81  and  82  may be formed by chrome or the other metal. Meanwhile, for a carrier gas, argon gas is preferred while nitrogen gas or the like may also be used. Width of the first and second bridge wirings  81  and  82  may be selected from a range of 2-25 μm for example, by adjusting slit width for and energy level of laser beams. Thickness of the bridge wirings  81  and  82  may be selected from a range not more than 1.0 μm according to a situation given arisen. 
         [0046]    Meanwhile, when to form the third laser-cut disconnection  93  by removing the ITO film consisting the pixel electrode  5 , following laser beams are adopted for example; laser beams are originated from a laser device as in above and being modulated with a ultrasonic Q-switching device; and energy level of the laser beams are in a range of 0.4-0.6 mJ (1-10 Hz). When to remove the insulator films  15  and  25  as well as the polysilicone layer for forming the first laser-cut disconnection  91 , laser beams in same as above are used except that energy level exceeds 0.6 mJ (2 Hz). As in the above, the laser device used for forming of the first, second and third bridge wirings  81 - 83  by the CVD technique is same with that for forming of the first, second and third laser-cut disconnections  91 - 93  by the laser evaporation technique, as to facilitate repairing processes. When metal depositing by the CVD technique is to be made on or in vicinity of the pixel electrode  6  that is formed of a transparent conductive layer such as ITO, it is preferable to adopt the laser beams in an ultraviolet (UV) range such as the third harmonic wave of Nd +3 :YLF laser. When the pixel electrode  6  is reflective one formed of a metal layer such as aluminum layer, the second harmonic wave of Nd +3 :YLF laser may be adopted for depositing metal layer on or in vicinity of the pixel electrode  6 . As a source of the laser beams, it is preferable to adopt the YLF laser as in the above concrete example or adopt YAG laser because the above energy level is easily achieved. Carbon dioxide laser or other laser may also be used depending on occasions. 
       Second Embodiment 
       [0047]    Second embodiment of the invention will be explained by use of a plan view of  FIG. 6  that corresponds to  FIG. 1 . This embodiment is to cope with an occasion where not only the wire breakage  31 A on the signal line  31  but also a wire breakage  33 A on a proximal or base portion of the L-shaped extension  33  are formed. In such occasion, it is easier to arrange the bypass wiring  8  on a side opposite to that of the first embodiment. In other words, instead of using the metal island pattern  32 - 1  on the pixel dot associated with the one signal line  31 - 1  having the wire breakage  31 A, it is adopted for the bypass wiring  8 , the metal island pattern  32 - 2  on a next pixel dot that is demarcated, by the one signal line  31 - 1  having the wire breakage  31 A, from the pixel dot associated with the one signal line  31 - 1 . In other words, the metal island pattern  32 - 2  used here has not been supplied with signal from the one signal line  31 - 1  having the wire breakage  31 A; and is another one among the two metal island patterns  32  that are in vicinity of the wire breakage  31 A on the one signal line  31 - 1 . Thus, the bypass wiring  8  on the second embodiment is arranged to be in symmetrical about the bypass wiring  8  of the first embodiment. In an example illustrated in  FIG. 5 , the first bridge wiring  81  is in same manner with that in the first embodiment, and runs linearly in parallel with the storage capacitor line  22 , from distal end of the one wiring part  31 C of the one signal line  31 - 1  to a metal layer covering the contact hole  28 , which is for connecting with the polysilicone island pattern  12 . Thus, whole of the L-shaped extension  33  of the metal island pattern  32 - 2  serves as part of the bypass wiring  8 . For this reason, when to electrically isolate the polysilicone island pattern  12  from the other conductive pattern, the laser-cut disconnection  92  severing the L-shaped extension  33  is not adoptable; and instead of this, a laser-cut disconnection  94  severing the linear extension  13  of the polysilocone island pattern  12  is adopted. In detail, the laser-cut disconnection  94  is formed by cutting through the linear extension  13  with the laser evaporation technique at middle between; a rectangular main part of the polysilicone island pattern  12 ; and the contact hole  28  that is at the distal end of the linear extension  13 . 
         [0048]    Other constructions of the second embodiment are in same with those of the first embodiment except that constructions for the repairing is arranged to be symmetrical with those in the first embodiment. For example, as in the first embodiment, the second bridge wiring  82  is L-shaped; and the first laser-cut disconnection  91  is made by the laser evaporation technique in same manner as above, as to disconnect the metal island pattern  32 - 2  used in the bypass wiring, from the TFT  7 - 2 . And, the pixel-electrode extension  61  overlapping with the metal island pattern  32 - 2  is severed at basal portion of the extension  61 ; by the laser evaporation technique in a manner same as in the first embodiment, as to form the laser-cut disconnection  93  between the extension  61  and other part of the pixel electrode  6 - 3 . The pixel electrode  6 - 3  is electrically connected through the third bridge wiring  83  with “prior-row” pixel electrode  6 - 4 , as in same manner with those in the first embodiment. 
         [0049]    In each of the above embodiments and examples, the above explanation is made on that of polysilicone TFTs and used in LCD display device. Nevertheless, repairing constructions same as above is applicable to an array substrate of amorphous silicone TFTs and to an array substrate of amorphous silicone TFTs or polysilicone TFTs for the OEL display device.