WO2006064832A1 - アクティブマトリクス基板、アクティブマトリクス基板の製造方法、表示装置、液晶表示装置およびテレビジョン装置 - Google Patents
アクティブマトリクス基板、アクティブマトリクス基板の製造方法、表示装置、液晶表示装置およびテレビジョン装置 Download PDFInfo
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- WO2006064832A1 WO2006064832A1 PCT/JP2005/022935 JP2005022935W WO2006064832A1 WO 2006064832 A1 WO2006064832 A1 WO 2006064832A1 JP 2005022935 W JP2005022935 W JP 2005022935W WO 2006064832 A1 WO2006064832 A1 WO 2006064832A1
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- liquid crystal
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- active matrix
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/136—Liquid crystal cells structurally associated with a semi-conducting layer or substrate, e.g. cells forming part of an integrated circuit
- G02F1/1362—Active matrix addressed cells
- G02F1/136213—Storage capacitors associated with the pixel electrode
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/136—Liquid crystal cells structurally associated with a semi-conducting layer or substrate, e.g. cells forming part of an integrated circuit
- G02F1/1362—Active matrix addressed cells
- G02F1/136259—Repairing; Defects
Definitions
- Active matrix substrate method for manufacturing active matrix substrate, display device, liquid crystal display device, and television device
- the present invention relates to an active matrix substrate, a method for manufacturing an active matrix substrate, a display device, a liquid crystal display device, and a television device.
- an active matrix hereinafter “assisted laser deposition”
- the present invention also relates to a substrate and an AM liquid crystal display device including the AM substrate.
- AM substrates are widely used in AM-type display devices such as liquid crystal display devices and EL (electral aperture luminescence) display devices.
- AM-type display devices such as liquid crystal display devices and EL (electral aperture luminescence) display devices.
- a conventional AM type liquid crystal display device using such an AM substrate a plurality of scanning signal lines arranged on the substrate and a plurality of data signal lines arranged so as to cross the scanning signal lines are provided.
- a thin film transistor hereinafter also referred to as “TFT”) disposed at the intersection of both signal lines, and an image signal is transmitted to each pixel portion by a TFT switching function.
- a storage capacitor element may be provided in each pixel portion (see, for example, Patent Document 1).
- Such a storage capacitor element prevents deterioration of an image signal due to self-discharge of a liquid crystal layer or off-current of the TFT while the TFT is off.
- the storage capacitor element is used not only for holding the video signal during the TFT off time, but also for the application path of various modulation signals in liquid crystal drive.
- a liquid crystal display device with a storage capacitor element has low power consumption. And high image quality.
- FIG. 24 is a schematic plan view showing a configuration of one pixel of an AM substrate provided with a storage capacitor element, which is used in a conventional AM type liquid crystal display device.
- FIG. 25 is a schematic cross-sectional view showing a cross section of the AM substrate shown in FIG. 24 taken along line AA ′.
- the AM substrate is provided with a plurality of pixel electrodes 51 in a matrix, and passes through the periphery of the pixel electrodes 51 so as to cross each other.
- a scanning signal line 52 for supplying a signal and a data signal line 53 for supplying a data signal are provided.
- a TFT 54 as a switching element connected to the pixel electrode 51 is provided at the intersection of the scanning signal line 52 and the data signal line 53.
- a scanning signal line 52 is connected to the gate electrode 62 of the TFT 54, and the TFT 54 is driven and controlled by a scanning signal input to the gate electrode 62.
- the data signal line 53 is connected to the source electrode 66a of the TFT 54, and a data signal is input to the source electrode 66a of the TFT 54. Further, the drain electrode 66 b is connected to one electrode (upper storage capacitor electrode) 55 a via the connection electrode 55 and further to the pixel electrode 51 via the contact hole 56 formed in the interlayer insulating film 68. It is connected to the.
- a storage capacitor (common) wiring 57 is provided on the transparent insulating substrate (insulating substrate) 61, and this storage capacitor (common) wiring 57 functions as the other electrode (lower storage capacitor electrode) of the storage capacitor element.
- a transparent insulating substrate made of glass, plastic, or the like.
- a gate electrode 62 connected to the scanning signal line 52 is provided on 61.
- the scanning signal line 52 and the gate electrode 62 are formed of a metal film made of titanium, chromium, anorium, molybdenum or the like, an alloy thereof, or a laminated film.
- a storage capacitor (common) wiring 57 that functions as the other electrode (lower storage capacitor electrode) of the storage capacitor element is formed of the same material as the scanning signal line 52 and the gate electrode 62.
- the gate insulating film 63 covering these is formed of an insulating film made of silicon nitride, silicon oxide, or the like.
- a high-resistance semiconductor layer 64 made of amorphous silicon, polysilicon, or the like and a low-resistance semiconductor made of n + amorphous silicon doped with impurities such as phosphorus are superimposed on the gate electrode 62. And a conductor layer. Note that the low-resistance semiconductor layer becomes the source electrode 66a and the drain electrode 66b.
- a data signal line 53 is formed so as to be connected to the source electrode 66a.
- a connection electrode 55 is provided so as to be connected to the drain electrode 66b, and the connection electrode 55 extends so as to be connected to the upper storage capacitor electrode 55a which is one electrode of the storage capacitor element.
- the electrode 55a is connected to the pixel electrode 51 through a contact hole 56.
- the data signal line 53, the connection electrode 55, and the upper storage capacitor electrode 55a are formed of the same material, such as a metal film such as titanium, chromium, aluminum, and molybdenum, or an alloy thereof. It is formed of a laminated film.
- the pixel electrode 51 is formed of a transparent conductive film such as ITO (indium tin oxide), IZO (indium zinc oxide), zinc oxide, tin oxide, or the like.
- the contact hole 56 is formed so as to penetrate an interlayer insulating film 68 that covers the TFT 54, the scanning signal line 52, the data signal line 53, and the connection electrode 55.
- Examples of the material of the interlayer insulating film 68 include acrylic resin, silicon nitride, and silicon oxide.
- Patent Document 2 discloses an AM substrate having a structure as shown in FIGS.
- the storage capacitor (common) wiring (lower storage capacitor electrode) 57 is connected to the scanning signal line 52 for the purpose of simplifying the manufacturing process and reducing the manufacturing cost.
- the upper storage capacitor electrode 55a is formed in the same process as the data signal line 53 and the connection electrode 55.
- the pixel electrode 51 when the pixel electrode 51 is formed on the interlayer insulating film 68, the pixel electrode 51 can be overlapped with the signal lines 52 and 53, so that the aperture ratio can be increased. Further, there is an effect that the electric field from each of the signal lines 52 and 53 to the pixel electrode 51 can be stored.
- a contact hole 56 is formed in the interlayer insulating film 68 on the pattern of the storage capacitor (common) wiring 57 or the scanning signal line 52, the pixel electrode 51 and the upper storage capacitor electrode 55a are connected, and the connection electrode 55 Thus, the pixel electrode 51 and the drain electrode 66b are connected to each other.
- the formation position of the contact hole 56 is not particularly limited to the formation region of the upper storage capacitor electrode 55a, but may be within the formation region of the connection electrode 55. However, as shown in FIG. 24, it is preferable to form it in the formation region of the upper storage capacitor electrode 55a on the pattern of the storage capacitor (common) wiring 57 because it does not cause a new cause of decreasing the aperture ratio.
- a liquid crystal display panel using a VA (Vertically Alignment) liquid crystal such as an MVA (Multi-domain Vertical Alignment) mode the display is set to display black when no voltage is applied.
- VA Very Alignment
- MVA Multi-domain Vertical Alignment
- the data signal line 53 and the upper storage capacitor electrode 55a are short-circuited, the data signal is input to the pixel electrode 51 without passing through the TFT 54, so the data signal input to the pixel electrode 51 is It becomes impossible to control. Therefore, when no voltage is applied, the pixel does not display black but becomes a bright spot.
- the bright spot generated when the entire surface is displayed in black is more conspicuous than the dark spot generated when the entire surface is displayed in white, which has a large effect on the display quality.
- Patent Documents 3 to 5 disclose techniques for correcting such point defects.
- Patent Documents 6 and 7 disclose a structure in which adjacent pixels share a storage capacitor wiring in order to increase the aperture ratio. Specifically, even when the pixel is divided into, for example, two sub-pixels, there are conductive foreign matters and pinholes in the insulating layer between the storage capacitor wiring (lower storage capacitor electrode) and the upper storage capacitor electrode. The storage capacitor wiring (lower storage capacitor electrode) and the upper storage capacitor electrode are short-circuited, and the short-circuited subpixel becomes a point defect in the display image. However, as compared with the case where no division is made, the area force of the point defect is increased, and the influence of the point defect on the display quality is reduced.
- FIG. 26 is a schematic plan view showing a configuration of one pixel on an AM substrate in which one pixel is divided into a plurality of sub-pixels.
- FIG. 27 is a schematic cross-sectional view showing a cross section of the AM substrate shown in FIG. 26 taken along line BB ′.
- the same components as those shown in FIG. 24 and FIG. 25 are given the same reference numerals.
- the pixel electrode 51 is divided into two subpixel electrodes 51L and 51R, and for supplying a scanning signal near the boundary between the subpixel electrodes 51L and 51R.
- a scanning signal line 52 is provided, and a data signal line 53 for supplying a data signal is provided around the pixel electrode 51.
- TFT 54L, 54R force S as a switching element connected to the subpixel electrodes 51L, 51R is arranged at the intersection of the scanning signal line 52 and the data signal line 53 with the scanning signal line 52 sandwiched in plan view. Is provided.
- a strike signal line 52 is connected to the gate electrodes 62L and 62R of the TFTs 54L and 54R, and the TFTs 54L and 54R are driven and controlled by a strike signal input to the gate electrodes 62L and 62R.
- the data signal line 53 is connected to the source electrodes 66a of the TFTs 54L and 54R, and data signals are input to the source electrodes of the TFTs 54L and 54R.
- the drain electrode 66b is connected to one electrode (upper storage capacitor electrode) 55La, 55Ra of the storage capacitor element via the connection electrodes 55L, 55R, and further, a contact hole 56 L formed in the interlayer insulating film 68. , 56R to the subpixel electrodes 51L, 51R.
- a storage capacitor (common) wiring 57 is provided on the transparent insulating substrate (insulating substrate) 61, and this storage capacitor (common) wiring 57 functions as the other electrode (lower storage capacitor electrode) of the storage capacitor element.
- the upper storage capacitor electrodes 55La and 55Ra of the pixels adjacent to each other share the storage capacitor (common) wiring 57 as the other electrode (lower storage capacitor electrode) of the storage capacitor element.
- the AM substrate shown in FIGS. 26 and 27 can be manufactured through a process similar to the process of manufacturing the AM substrate shown in FIGS. 24 and 25.
- a storage capacitor (common) wiring 57 is formed in the vicinity of the boundary between adjacent pixels in order to suppress a decrease in the aperture ratio.
- the upper storage capacitor electrodes 55La and 55Ra provided facing the storage capacitor (common) wiring 57 need to have as large an area as possible in order to secure a sufficient storage capacitor. Therefore, since the upper storage capacitor electrodes 55La and 55Ra of the pixels adjacent to each other are formed close to each other, a leakage defect is likely to occur between the upper storage capacitor electrodes 55La and 55Ra adjacent to each other.
- the connection electrode 55R of the second pixel and the upper electrode is electrically disconnected. Therefore, a sub-pixel of one pixel (second pixel) among adjacent pixels becomes non-energized, resulting in a point defect.
- the influence of point defects on the display quality is reduced as compared with the AM substrate that is not divided, but the upper storage capacitor electrodes 55La and 55Ra adjacent to each other are reduced. There is room for improvement in terms of increasing the possibility of point defects.
- Patent Document 1 JP-A-6-95157 (first page)
- Patent Document 2 Japanese Patent Laid-Open No. 9152625 (8-11, 19th, 3rd, 4th)
- Patent Document 3 Japanese Patent Laid-Open No. 1 303415
- Patent Document 4 JP-A-9 222615
- Patent Document 5 Japanese Patent Laid-Open No. 7-270824
- Patent Document 6 Japanese Unexamined Patent Application Publication No. 2004-62146
- Patent Document 7 Japanese Unexamined Patent Application Publication No. 2004-78157
- One of the objects of the present invention is to correct a point defect in an AM substrate. Another object of the present invention is to improve manufacturing yield by correcting point defects.
- two or more upper storage capacitor electrodes disposed opposite to the storage capacitor wiring are provided, contact holes are formed in the interlayer insulating film on each upper storage capacitor electrode, and the interlayer insulating film is interposed via the contact holes.
- FIG. 1 is a plan view schematically showing one embodiment of the AM substrate 12 of the present invention
- FIG. 2 is a cross-sectional view taken along line II-II in FIG.
- the AM substrate 12 of this embodiment covers the substrate 31, the active element (for example, TFT 24) formed on the substrate 31, the storage capacitor element 20 formed on the substrate 31, and the storage capacitor element 20.
- the interlayer insulating film 38 and the pixel electrode 21 formed on the interlayer insulating film 38 are included.
- the storage capacitor element 20 includes a storage capacitor wiring 27 formed on the substrate 31, an insulating film (for example, the gate insulating film 33) formed on the storage capacitor wiring 27, and the storage capacitor wiring 2 via the gate insulating film 33. 7 has three upper storage capacitor electrodes 25a, 25b and 25c arranged opposite to each other.
- the TFT 24 is formed on the gate electrode 32 via the gate electrode 32 extending in the row direction from the scanning signal line 22 extending in the column direction, the gate insulating film 33 covering the gate electrode 32, and the gate insulating film 33.
- the high-resistance semiconductor layer 34 includes a source electrode 36 a and a drain electrode 36 b formed on the high-resistance semiconductor layer 34.
- the source electrode 36a is connected to the data signal line 23 extending in the row direction
- the drain electrode 36b is connected to the upper storage capacitor electrode 25b through the connection electrode 25 and connected.
- the three upper storage capacitor electrodes 25a, 25b, and 25c are electrically connected to the pixel electrode 21 through contact holes 26a, 26b, and 26c formed in the interlayer insulating film 38, respectively.
- the three upper storage capacitor electrodes 25a, 25b, and 25c are conducted through the pixel electrode 21, so that the data signal input to one upper storage capacitor electrode 25b is input to the pixel electrode 21 through the connection electrode 25.
- a data signal is input to the two upper storage capacitor electrodes 25a and 25c. That is, the same potential is applied to the three upper storage capacitor electrodes 25a, 25b, and 25c.
- the potential supplied to the storage capacitor wiring 27 is the upper storage capacitor electrode 25a. , 25c to the pixel electrode 21.
- the counter electrode (not shown) arranged opposite to the pixel electrode 21 and the storage capacitor wiring 27, no voltage is applied to the pixel electrode 21 and the counter electrode. . Therefore, normally white mode LCD In the display device, the pixel is a bright spot, and in the normally black mode liquid crystal display device, the pixel is a black spot.
- the pixel electrodes 21 in the contact holes 26a and 26c formed in the short-circuited upper storage capacitor electrodes 25a and 25c are removed by a laser or the like.
- the short-circuited upper storage capacitor electrodes 25a and 25c can be separated from the pixel electrode 21, so that the potential from the storage capacitor wiring 27 is applied to the pixel electrode 21 through the upper storage capacitor electrodes 25a and 25c. Can be prevented. Accordingly, although the storage capacity is lower than that in the normal case, the pixel drive can be performed normally.
- the connection electrode 25 and the storage capacitor wiring 27 are short-circuited by a conductive foreign substance or pinhole in the gate insulating film 33, the short-circuited upper storage capacitor
- the connection electrode 25 is broken and separated at the cutting point K by using a laser or the like, it is possible to prevent the data signal line 23 and the storage capacitor line 27 from being short-circuited via the TFT 24.
- the pixel electrode 21 is also separated from the TFT 24, the other upper storage capacitor electrodes 25a and 25c (except for the region of the contact Honor 26a and 26c) are melted with a laser, etc.
- the electrode 21 and the storage capacitor wiring 27 are brought into conduction.
- the pixel electrode 21 can be set to the same potential as the storage capacitor wiring 27.
- the region of the pixel electrode 21 is displayed in black and corrected as a micro defect. be able to.
- the area (first area) of the region where the upper storage capacitor electrode 25b connected to the connection electrode 25 and the storage capacitor wiring 27 overlap is not connected to the connection electrode 25. This is smaller than the area (second area) of the region where the upper storage capacitor electrodes 25a, 25c and the storage capacitor wiring 27 overlap.
- the probability that the storage capacitor wiring 27 and the upper storage capacitor electrodes 25a, 25b, 25c are short-circuited, etc. The area ratio between the first area and the second area can be appropriately selected.
- the contact hole 26a, 26c it may be more difficult for the contact hole 26a, 26c to connect the pixel electrode 21 to the upper storage capacitor electrodes 25a, 25c with better coverage than the contact hole 26b.
- the contact resistance between the metal film such as aluminum of the upper storage capacitor electrode and the ITO film of the pixel electrode 21 may be large.
- the upper storage capacitor electrodes 25a and 25c may not function as the electrodes of the storage capacitor element. Therefore, the first area is set to be larger than the second area. As a result, the ratio of the first area to the total area of the first area and the second area is increased, so that a large storage capacity corresponding to the ratio of the first area can be secured.
- connection electrodes 25 that connect the TFT 24 and the upper storage capacitor electrode is one.
- a decrease in the aperture ratio can be suppressed as compared with the case where the connection electrode 25 is connected to all the upper storage capacitor electrodes 25a, 25b, and 25c.
- connection electrode that connects the TFT 24 and the upper storage capacitor electrode with the force that connects the TFT 24 and the upper storage capacitor electrode 25b via the connection electrode 25. Good. Thereby, the fall of an aperture ratio can further be suppressed.
- the upper electrode is held through the pixel electrode 21. The potential of the data signal can be applied to the capacitive electrodes 25a, 25b, and 25c.
- the position of the contact hole 26a is not limited to the region of the upper storage capacitor electrode 25b, and can be in the region of the connection electrode 25. However, as shown in FIG. 1, if the contact hole 26a is formed in the pattern of the storage capacitor wiring 27 and in the region of the upper storage capacitor electrode 25b, the decrease in the aperture ratio can be suppressed.
- the AM substrate 12 of the present invention when used in a liquid crystal display device having an operation mode of MVA, the AM substrate 12 is formed on a region of a slit (portion where no electrode layer is provided) or on a counter substrate, and is on the liquid crystal layer side.
- the connection electrode 25 By arranging the connection electrode 25 in the area of the rib (projection) protruding to The decrease in aperture ratio due to 25 can be reduced.
- the shape of the upper storage capacitor electrodes 25a, 25b, 25c in a plan view is a quadrilateral shape, but is not limited to this, and is a shape such as a triangle, a semicircle, a trapezoid, or the like. Moyore.
- the three upper storage capacitor electrodes 25a, 25b, and 25c are provided on the gate insulating film 33 so as to overlap the pattern of the storage capacitor wiring 27.
- the upper holding capacitor electrode is formed with the same film force as that of the data signal line 23, so that the upper holding capacitor electrode is easily short-circuited with the data signal line 23 due to the film remaining 98. Therefore, as shown in FIG.
- the upper storage capacitor electrodes 25a and 25c adjacent to the data signal line 23 from the upper storage capacitor electrode 25b connected to the connection electrode 25.
- the upper storage capacitor electrode is divided into three as shown in FIG. 1. However, the number of divisions (N) is not limited to this, and it is sufficient if N ⁇ 2.
- the storage capacitor line 27 is typically formed of the same material as the stray signal line 22 and the gate electrode 32, but is not limited thereto.
- the storage capacitor line 27 may be formed using another material (for example, a transparent conductive film such as ITO) before or after the formation of the scanning signal line 22 and the gate electrode 32.
- the insulating film constituting the storage capacitor element 20 is only the gate insulating film 33 as shown in FIG. 2, but this is not a limitation. ,.
- a multilayer film including the gate insulating film 33 is formed on the storage capacitor wiring 27 by forming an insulating film other than the gate insulating film 33 before or after the formation of the gate insulating film 33. Also good.
- the AM substrate of the present invention can be used for display devices such as liquid crystal display devices and organic or inorganic EL display devices.
- the present invention provides a display device.
- the display device of the present invention includes the AM substrate of the present invention, a counter electrode facing the AM substrate, and a display medium layer interposed in the gap between the AM substrate and the counter electrode.
- the “display medium layer” is a layer in which the amount of light is adjusted according to the applied voltage or supplied current, and the light transmittance of light from the light source and external light (ambient light) ( Or, a layer whose light reflectance is modulated or a self-luminous layer is included.
- Specific examples of the display medium layer include a liquid crystal layer, an inorganic or organic EL layer, and the like.
- the “counter electrode” is disposed to face the pixel electrode of the AM substrate. It is an electrode, and includes a common (entire surface) electrode and a stripe electrode.
- an anode corresponds to a pixel electrode and a cathode corresponds to a counter electrode.
- the counter electrode may be formed of a light-reflective conductive film such as aluminum or silver, or may be formed of a transparent conductive film such as ⁇ , ⁇ , zinc oxide, or tin oxide.
- the present invention provides a liquid crystal display device.
- a liquid crystal display device of the present invention includes the AM substrate of the present invention, a counter substrate having a counter electrode facing the AM substrate formed on one surface thereof, and a liquid crystal layer interposed between the AM substrate and the counter substrate.
- the counter substrate is typically a transparent insulating substrate made of glass or plastic.
- the same potential may be applied to the storage capacitor line and the counter electrode.
- an organic EL display device when the pixel electrode conducts to the storage capacitor wiring by correcting a point defect on the AM substrate, if the storage capacitor wiring and the counter electrode are at the same potential, the organic EL layer (typically In this case, no current flows through the electron transport layer, the light emitting layer, and the hole transport layer), so that the light emitting region (pixel) does not emit light. In other words, since the light emitting region is blackened, the point defect is not noticeable.
- the liquid crystal display device is typically driven in a normally black mode, so that the corrected pixel becomes a black display. , Point defects are less noticeable.
- the liquid crystal display device is driven in a normally white mode.
- a predetermined voltage is applied to the liquid crystal layer by conducting the pixel electrode of the defective pixel to the storage capacitor wiring and supplying a potential different from the potential supplied to the counter electrode to the storage capacitor wiring.
- a predetermined voltage (voltage when the pixel is displayed in black) is applied to the liquid crystal layer by supplying a potential when the pixel is displayed as black to the storage capacitor wiring.
- FIG. 1 is a plan view schematically showing one embodiment of an AM substrate 12 of the present invention.
- FIG. 2 is a sectional view taken along line II-II in FIG.
- FIG. 3 is a plan view schematically showing an AM substrate 12a of the first embodiment.
- FIG. 4 is a sectional view taken along line IV-IV in FIG.
- FIG. 5 is a plan view for schematically explaining a correction process when a short circuit occurs between the upper storage capacitor electrodes 25a and 25c.
- FIG. 6 is a plan view for schematically explaining a correction process in the case where a short circuit occurs between the upper storage capacitor electrode 25a and the data signal line 23.
- FIG. 7 is a plan view for schematically explaining a correction process when the upper storage capacitor electrode 25a and the storage capacitor wiring 27 are short-circuited.
- FIG. 8 is a plan view for schematically explaining a correction process when a short circuit occurs between the upper storage capacitor electrode 25b and the upper storage capacitor electrode 25d.
- FIG. 9 is a plan view for schematically explaining a correction process in the case where a short circuit occurs between the upper storage capacitor electrode 25b and the data signal line 23.
- FIG. 10 is a plan view for schematically explaining a correction process when the upper storage capacitor electrode 25b and the storage capacitor wiring 27 are short-circuited.
- FIG. 11 is a plan view schematically showing an AM substrate 12b of a second embodiment set as described above.
- FIG. 12 is a plan view schematically showing an AM substrate 12c of the third embodiment.
- FIG. 13 is a plan view schematically showing an AM substrate 12d of the fourth embodiment.
- FIG. 14 is a plan view schematically showing an AM substrate 12e of the fifth embodiment.
- FIG. 15 is a plan view schematically showing an AM substrate 12f of the sixth embodiment.
- FIG. 16 is a cross-sectional view schematically showing the liquid crystal display panel of Embodiment 5 along the line XVI—XVI in FIG. 15.
- FIG. 17 is a plan view for schematically explaining a correction process when a short circuit occurs between the upper storage capacitor electrodes 25a and 25c in the AM substrate 12f of the sixth embodiment.
- FIG. 18 is a plan view schematically showing an AM substrate 12g of the seventh embodiment.
- FIG. 19 is a cross-sectional view taken along the line XIX—XIX in FIG.
- FIG. 20 is a plan view schematically showing an AM substrate 12h according to the eighth embodiment.
- FIG. 21 is a cross-sectional view taken along line XXI—XXI in FIG.
- FIG. 22 is a block diagram showing the television device 15 of the ninth embodiment.
- FIG. 23 is a block diagram showing the liquid crystal display device 10 of the ninth embodiment.
- FIG. 24 shows an A with a storage capacitor element used in a conventional AM liquid crystal display device.
- FIG. 25 is a schematic cross-sectional view showing a cross section of the AM substrate shown in FIG. 24 taken along line AA ′.
- FIG. 26 is a schematic plan view showing the configuration of one pixel on the AM substrate in which one pixel is divided into a plurality of sub-pixels.
- Fig. 27 is a schematic cross-sectional view showing a cross section of the AM substrate shown in Fig. 26 taken along line BB '.
- the present invention is not limited to the following embodiments.
- the reference characters may be omitted and only the reference characters may be indicated.
- the first scanning signal line 22a and the second scanning signal line 22b may be collectively referred to as the scanning signal line 22.
- a sub-pixel (sub-pixel) obtained by dividing one pixel into a plurality of pixels is driven by a common scanning signal line and data signal line, and is adjacent to the direction in which the data signal line extends. Pixels share the same storage capacitor (common) wiring.
- an upper storage capacitor electrode divided into three or more is formed via an insulating film.
- Two or more upper storage capacitor electrodes are connected to TFTs provided near intersections of the scanning signal lines and the data signal lines via the respective connection electrodes. Further, the connection electrode is connected, and the upper storage capacitor electrode is connected to the subpixel electrode constituting the subpixel.
- a twist alignment type liquid crystal display device driven in a normally white mode for example, a potential when a pixel is displayed in black is supplied to a storage capacitor (common) wiring, whereby a predetermined value is applied to the liquid crystal layer. Since a voltage (a voltage when the pixel is displayed in black) is applied, the corrected pixel becomes a black spot, and the point defect becomes inconspicuous. Therefore, by performing the above correction, defective pixels can be made into minute point defects at a level that does not cause a problem in display quality, and the manufacturing yield can be improved.
- FIG. 3 is a plan view schematically showing the AM substrate 12a of the present embodiment
- FIG. 4 is a sectional view taken along line IV-IV in FIG.
- the AM substrate 12a of this embodiment is a Cs-on-Common method in which a storage capacitor wiring is formed as a lower electrode of the storage capacitor element.
- the AM of this embodiment The substrate 12a has a structure in which one pixel is divided into two subpixels and adjacent pixels share a storage capacitor wiring.
- a subpixel is a minimum unit of display, and is selected by a scanning signal supplied to the same scanning signal line and a data signal supplied to the same data signal line, and has the same data.
- One pixel is composed of two or more subpixels to which signals are input.
- one picture element is composed of three pixels of R, G, and B.
- the area of the pixel or subpixel is defined by a pixel electrode (or subpixel electrode) and a counter electrode facing the pixel electrode (or subpixel electrode).
- regions corresponding to the openings of the black matrix are regions of pixels or sub-pixels). It will correspond to.
- the AM substrate 12a of the present embodiment has a plurality of pixels arranged in a matrix, and one pixel is composed of two sub-pixels arranged in the row direction.
- the pixel electrode is divided into two sub-pixel electrodes 21R (first pixel electrode) and 21L (second pixel electrode).
- a scanning signal line 22 for supplying a scanning signal is provided so as to extend in the column direction (vertical direction in the drawing).
- a data signal line 23 is provided to extend in the row direction (lateral direction in the figure).
- the scanning signal line 22 is arranged with being sandwiched in the row direction in plan view, and as two switching elements connected to the corresponding subpixel electrodes 21R and 21L. TFT24R, 24L force S is provided.
- a scanning signal line 22 is connected to the gate electrodes of the TFTs 24R and 24L, and the TFTs 24R and 24L are driven and controlled by a scanning signal input to the gate electrodes.
- the data signal line 23 is connected to the source electrode 36a of the TFT 24R, 24L, and a data signal is input to the source electrode 36a of the TFT 24R, 24L.
- the drain electrode 36b is connected to one electrode (upper storage capacitor electrode) 25a, 25c of the storage capacitor element via the connection electrodes 25L, 25R, and is connected to the secondary electrode via the contact hole 26a, 26c formed in the interlayer insulating film 38. It is connected to the pixel electrodes 21R and 21L. In FIG.
- the right sub-pixel electrode 21R included in the first pixel on the left side of the storage capacitor (common) wiring 27 and the second pixel adjacent to the first pixel in the row direction (right side) are included.
- the left sub-pixel electrode 21L is shown.
- the sub-pixel electrode 21R included in the first pixel has two sub-pixel electrodes selected by the scanning signal supplied to the first scanning signal line 22a and the data signal supplied to the data signal line 23. This is the right sub-pixel electrode.
- the sub-pixel electrode 21L included in the second pixel includes a scanning signal supplied to the first scanning signal line 22a and the second scanning signal line 22b adjacent in the row direction across the storage capacitor (common) wiring 27, and This is the left sub-pixel electrode of the two sub-pixel electrodes selected by the data signal supplied to the data signal line 23.
- the two subpixels each include a first storage capacitor element 2OR and a second storage capacitor element 20L each including a pair of electrodes sandwiching an insulating film.
- the first and second storage capacitor elements 20R and 20L are connected to a storage capacitor (common) wiring provided on a transparent insulating substrate (insulated substrate) 31 as one electrode (lower storage capacitor electrode) of the storage capacitor element.
- Share 27 A gate insulating film 33 is formed on the storage capacitor (common) wiring 27, and the other electrode of the storage capacitor element (upper side holding) disposed opposite to the storage capacitor (common) wiring 27 through the gate insulating film 33. Capacitance electrode) is formed.
- the upper storage capacitor electrode facing the storage capacitor (common) wiring 27 is divided into four, and the upper storage capacitor electrodes 25a and 25b of the first storage capacitor element 20R and the upper storage capacitor electrode 25c of the second storage capacitor element 20L. , 25d. These upper storage capacitor electrodes 25 a, 25 b, 25 c, 25 d are arranged so as to overlap the pattern of the storage capacitor (common) wiring 27.
- connection electrodes 25R, 25L are connected to one upper storage capacitor electrode 25a, 25c for each storage capacitor element 20R, 20L.
- a non-transparent material is used as the material for the connection electrodes 25R and 25L, so that the formation region of the connection electrodes 25R and 25L becomes a non-transmission region. Therefore, since it is difficult to use the connection electrodes 25R and 25L as the openings, by connecting the connection electrodes 25R and 25L to only one upper storage capacitor electrode 25a and 25c, The aperture ratio can be increased as compared with the case of connection. However, if the area of the connection electrodes 25R and 25L can be overlapped with areas such as ribs and slits, connect the connection electrodes to both upper storage capacitor electrodes. It is preferable to do.
- a cross-sectional structure of the subpixel electrode 21R included in the first pixel will be described with reference to FIG.
- a gate electrode 32R connected to the first scanning signal line 22a is provided on a transparent insulating substrate (insulating substrate) 31 made of glass or plastic.
- the gate electrode 32R of the first running signal line 22a is formed of a metal film made of titanium, chromium, anorium, molybdenum or the like, an alloy thereof, or a laminated film.
- the storage capacitor (common) wiring 27 that functions as the lower storage capacitor electrode of the storage capacitor element is typically formed of the same material as the first scanning signal line 22a and the gate electrode 32R.
- the gate insulating film 33 covering these is formed of an insulating film made of silicon nitride, silicon oxide, or the like.
- a high-resistance semiconductor layer 34 made of amorphous silicon, polysilicon, or the like and a low-resistance semiconductor made of n + amorphous silicon doped with impurities such as phosphorus so as to overlap with the gate electrode 32R. Layers are provided. Note that the low-resistance semiconductor layer becomes the source electrode 36a and the drain electrode 36b.
- the data signal line 23 is formed so as to be connected to the source electrode 36a.
- a connection electrode 25R is provided so as to be connected to the drain electrode 36b, the connection electrode 25R extends so as to be connected to one upper storage capacitor electrode 25a, and the upper storage capacitor electrode 25a is connected to the sub-pixel electrode 21R. And through a contact hole 26a.
- the other upper storage capacitor electrode 25b is connected to the sub-pixel electrode 21R through the contact hole 26b. That is, the two upper storage capacitor electrodes 25a and 25b are electrically connected to each other via the subpixel electrode 21R.
- the data signal line 23, the connection electrode 25, and the upper storage capacitor electrodes 25a and 25b are typically formed of the same material, for example, a metal film made of titanium, chromium, aluminum, molybdenum or the like, an alloy thereof, or a laminated film Formed from.
- the pixel electrodes 21R and 21L are formed of a conductive film having transparency such as ITO, ⁇ , zinc oxide, and soot oxide.
- the contact holes 26a and 26b are formed so as to penetrate through the interlayer insulating film 38 formed so as to cover the TFT 24R, the scanning signal line 22a, the data signal line 23, and the connection electrode 25.
- Examples of the material of the interlayer insulating film 38 include acrylic resin, silicon nitride, silicon oxide, and the like.
- the upper storage capacitor electrodes 25a to 25d provided facing the storage capacitor (common) wiring 27 need to be as large as possible in order to secure a sufficient storage capacitor. . Accordingly, since the upper storage capacitor electrodes of the sub-pixels adjacent to each other in the row direction are formed close to each other, a leakage defect is likely to occur between the upper storage capacitor electrodes adjacent to each other in the row direction.
- the data signal line 23 and the upper storage capacitor electrode 25a may be short-circuited due to a defect in the film residue. Further, the upper storage capacitor electrode 25a and the storage capacitor wiring 27 may be short-circuited by a conductive foreign substance or a pinhole in the gate insulating film 33.
- FIG. 5 is a plan view for schematically explaining a correction process when a short circuit occurs between the upper storage capacitor electrodes 25a and 25c adjacent to each other and connected to the connection electrodes 25R and 25L, respectively. .
- a short circuit occurs between the upper storage capacitor electrodes 25a and 25c due to the remaining film, etc. Since the electrode 21R and the subpixel electrode 21L are conductive, this is a connection defect.
- FIG. 6 is a plan view for schematically explaining a correction process when a short circuit occurs between the upper storage capacitor electrode 25a connected to the connection electrode 25R and the data signal line 23.
- FIG. 6 In the AM substrate 12ab before the correction, the data signal line 23 and the upper storage capacitor electrode 25a are short-circuited due to defects such as a film residue, and data is transferred from the data signal line 23 to the sub-pixel electrode 21R through the upper storage capacitor electrode 25a. A signal is being input.
- FIG. 7 is a plan view for schematically explaining a correction process when the upper storage capacitor electrode 25a connected to the connection electrode 25R and the storage capacitor wiring 27 are short-circuited.
- the upper storage capacitor electrode 25a and the storage capacitor wiring 27 are short-circuited by the conductive foreign matter or the pinhole in the gate insulating film 33, and the shorted pixel becomes a point defect in the display image. .
- the upper storage capacitor electrode 25a connected to the connection electrode 25R is short-circuited to the upper storage capacitor electrode 25c, the data signal line 23, or the storage capacitor wiring 27 that is in contact with the connection electrode 25R, it is formed on the shorted upper storage capacitor electrode 25a.
- the connection electrode 25R is broken and separated by a laser or the like at the cutting point K, the short-circuited upper storage capacitor electrode 25a can be separated. Therefore, when the TFT24R is on, the data signal line is connected via the TFT24R. 23 and the storage capacitor wiring 27 can be prevented from leaking.
- the sub-pixel electrode 21R is also electrically separated from the TFT 21R and is in a non-energized state. Therefore, the other upper storage capacitor electrode 25b (except for the region of the contact hole 26b) is replaced with the laser 102 or the like. As a result, the sub-pixel electrode 21R and the storage capacitor (common) wiring 27 are brought into conduction through the upper storage capacitor electrode 25b. As a result, the subpixel electrode 21R can be set to the same potential as the storage capacitor (common) wiring 27. Therefore, in the liquid crystal display device having the AM substrate 12a thus corrected, the area of the sub-pixel electrode 21R can be displayed in black and can be corrected as a small defect.
- FIG. 8 schematically illustrates a correction process when a short circuit occurs between the upper storage capacitor electrode 25b not connected to the connection electrode 25R and the upper storage capacitor electrode 25d adjacent thereto.
- FIG. 8 In the AM substrate 12ad before the correction, a short circuit occurs between the upper storage capacitor electrodes 25b and 25d due to a film residue, etc., and the sub-adjacent ones are adjacent to each other through the shorted upper storage capacitor electrodes 25b and 25d and the contact holes 26b and 26d. Since the pixel electrode 21R and the sub-pixel electrode 21L are conductive, this is a connection defect.
- FIG. 9 shows the upper storage capacitor electrode 25b not connected to the connection electrode 25R and the data signal line.
- FIG. 23 is a plan view for schematically explaining a correction process when a short circuit occurs at 23.
- the data signal line 23 and the upper storage capacitor electrode 25b are short-circuited due to a defect of the film remaining, and the data signal line 23 is connected to the sub-pixel electrode 21R through the upper storage capacitor electrode 25b. Data signal is input.
- FIG. 10 is a plan view for schematically explaining a correction process when the upper storage capacitor electrode 25b not connected to the connection electrode 25R and the storage capacitor wiring 27 are short-circuited.
- the upper storage capacitor electrode 25b and the storage capacitor wiring 27 are short-circuited by a conductive foreign substance or a pinhole in the gate insulating film 33, and the shorted pixel becomes a point defect in the display image. ing.
- the connection is short-circuited.
- the electrode portion 103 in the contact hole 26b formed in the upper storage capacitor electrode 25b is removed by a laser or the like.
- the short-circuited upper storage capacitor electrode 25b can be separated from the sub-pixel electrode 21R, so that the potential from the storage capacitor wiring 27 is prevented from being applied to the sub-pixel electrode 21R via the upper storage capacitor electrode 25b. be able to. Therefore, the sub-pixel can be driven in a state close to normal.
- the area (first area) where the upper storage capacitor electrodes 25a and 25c connected to the connection electrodes 25R and 25L overlap with the storage capacitor wiring 27 is connected to the connection electrodes 25R and 25L.
- the upper storage capacitor electrodes 25b and 25d and the storage capacitor wiring 27 that are not overlapped are set to be larger than the area (second area) of the overlapping region.
- the contact holes 26b and 26d may be more difficult to connect the sub-pixel electrodes 21R and 21L to the upper storage capacitor electrodes 25b and 25d with better coverage.
- the contact resistance between the metal film containing aluminum or the like of the upper storage capacitor electrode and the ITO film of the subpixel electrodes 21R and 21L may be large.
- the upper storage capacitor electrodes 25b and 25d may not function as the electrodes of the storage capacitor element. Therefore, by setting the first area to be larger than the second area, the ratio of the first area to the total area of the first area and the second area is increased. A large holding capacity according to the ratio can be secured.
- the first area may be smaller than the second area.
- FIG. 11 shows the area force of the region where the upper storage capacitor electrodes 25a and 25c connected to the connection electrodes 25R and 25L overlap with the storage capacitor wiring 27.
- the upper storage capacitor electrode not connected to the connection electrodes 25R and 25L FIG. 6 is a plan view schematically showing an AM substrate 12b set so as to be smaller than the area of the region where 25b, 25d and the storage capacitor wiring 27 overlap. Note that the same reference numerals are assigned to the same constituent elements as those in the first embodiment, and the description of the constituent elements having the same reference numerals is omitted.
- the upper storage capacitor connected to the connection electrodes 25R and 25L The area of the region where the electrodes 25a, 25c and the storage capacitor wiring 27 overlap (first area) is the area of the region where the upper storage capacitor electrodes 25b, 25d not connected to the connection electrodes 25R, 25L and the storage capacitor wiring 27 overlap (the first area) 2 area), when the upper storage capacitor electrodes 25a and 25c connected to the connection electrodes 25R and 25L are short-circuited, the first area and the second area are added.
- a large storage capacity can be secured according to the ratio of the second area to the total overlap area.
- the right side of two sub-pixels included in the first pixel on the left side of the storage capacitor wiring 27 (only a part of the left sub-pixel is shown).
- Subpixel (first subpixel) and the left subpixel (second subpixel) of the two subpixels (only a part of the right subpixel is shown) included in the second pixel on the right side of the storage capacitor wiring 27 The arrangement of the upper storage capacitor electrodes 25a to 25d is symmetrical with respect to the subpixel.
- the upper storage capacitor electrode 25a connected to the connection electrode 25R in the first sub-pixel and the upper storage capacitor electrode 25c connected to the connection electrode 25L in the second sub-pixel extend in the direction in which the storage capacitor wiring 27 extends.
- Direction in which the upper storage capacitor electrode 25c not connected to the connection electrode 25R and the upper storage capacitor electrode 25d not connected to the connection electrode 25L extend the storage capacitor wiring 27. Are adjacent to each other in the crossing direction.
- the arrangement of the upper storage capacitor electrodes 25a to 25d is not limited to that shown in the second embodiment, and the upper storage capacitor electrode connected to the connection electrode 25R in the first subpixel. 25a and the upper storage capacitor electrode 25c connected to the connection electrode 25L in the second subpixel may be arranged so as to be shifted in the direction in which the storage capacitor wiring 27 extends.
- FIG. 12 is a plan view schematically showing the AM substrate 12c of the present embodiment.
- the upper storage capacitor electrode 25c connected to the connection electrode 25L in the second subpixel is illustrated in the drawing with respect to the upper storage capacitor electrode 25a connected to the connection electrode 25R in the first subpixel. It is shifted and arranged on the lower side.
- the upper storage capacitor electrode 25d not connected to the connection electrode 25L in the second subpixel is shifted to the upper side in the drawing with respect to the upper storage capacitor electrode 25b not connected to the connection electrode 25R in the first subpixel. It is arranged.
- the upper storage capacitor electrode 25c is displaced from the lower side of the drawing, so that the connection electrode 25L that connects the drain electrode of the TFT 24L and the upper storage capacitor electrode 25c is connected.
- the aperture ratio of the second subpixel may be lower than the aperture ratio of the first subpixel.
- the AM substrate 12c of the present embodiment is used for a liquid crystal display device with an operation mode of MVA, ribs formed on the region of the slit (the portion without the electrode layer) or on the counter substrate and projecting toward the liquid crystal layer ( By disposing the connection electrode 25L in the region of the convex portion, it is possible to suppress a decrease in the aperture ratio due to the length of the connection electrode 25L.
- the upper storage capacitor electrodes 25a and 25c connected to the connection electrodes 25R and 25L are close to each other, and therefore, between the upper storage capacitor electrodes 25a and 25c. Leakage may occur. If the upper storage capacitor electrodes 25a and 25c connected to the connection electrodes 25R and 25L are short-circuited, it is necessary to correct one of the sub-pixels to make a black spot.
- the upper storage capacitor electrodes 25a and 25c connected to the connection electrodes 25R and 25L are separated from each other as compared with the second embodiment.
- the possibility of short circuiting 25c is low. If the upper storage capacitor electrodes 25a, 25c connected to the connection electrodes 25R, 25L are short-circuited with the upper storage capacitor electrodes 25b, 25d not connected to the connection electrodes 25R, 25L, the connection electrodes 25R, 25L
- the connection electrodes 25R, 25L By separating the upper storage capacitor electrodes 25b and 25d that are not connected, the storage capacitor due to the upper storage capacitor electrodes 25b and 25d is reduced, but sub-pixels can be displayed with a drive close to normal.
- the upper storage capacitor electrodes 25a and 25b in the first subpixel and the upper storage capacitor electrodes 25c and 25d in the second subpixel intersect with the direction in which the storage capacitor wiring 27 extends. Although it is adjacent, the present invention is not limited to this.
- the upper storage capacitor electrodes 25a to 25d may be arranged in the direction in which the storage capacitor wiring 27 extends.
- FIG. 13 is a plan view schematically showing the AM substrate 12d of the present embodiment.
- the two upper storage capacitor electrodes 25a and 25b included in the first subpixel are The two upper storage capacitor electrodes 25c and 25d included in the second subpixel are arranged on the upper side in the drawing.
- the upper storage capacitor electrode 25a connected to the connection electrode 25R in the first subpixel is arranged above the upper storage capacitor electrode 25b not connected to the connection electrode 25R in the drawing.
- the upper storage capacitor electrode 25c connected to the connection electrode 25L in the second sub-pixel is connected to the connection electrode 25L and is arranged below the upper storage capacitor electrode 25d in the drawing. ing.
- the width of the storage capacitor wiring 27 can be reduced, so that the opening of the sub-pixel can be reduced.
- the rate can be improved. Since the upper storage capacitor electrodes 25b and 25d are interposed between the upper storage capacitor electrode 25a connected to the connection electrode 25R and the upper storage capacitor electrode 25c connected to the connection electrode 25L, both electrodes 25a, Short circuit between 25c can be prevented.
- the upper storage capacitor electrode 25b of the first sub-pixel and the upper storage capacitor electrode 25d of the second sub-pixel are short-circuited, the sub-pixel is normally brought close to and driven by separating one upper storage capacitor electrode. Can be displayed.
- each of the first sub-pixel and the second sub-pixel is provided with the two upper storage capacitor electrodes 25a to 25d. At least one of the two sub-pixels adjacent to each other is provided.
- the upper storage capacitor electrode may be divided into two or more for the pixel.
- FIG. 14 is a plan view schematically showing the AM substrate 12e of the present embodiment.
- the second subpixel has two upper storage capacitor electrodes 25c and 25d, but only the one upper storage capacitor electrode 25a in which the first subpixel is connected to the connection electrode 25R. have.
- the upper storage capacitor electrode is divided into two or more, the storage capacitance of the sub-pixel is reduced as compared with the case where the upper storage capacitor electrode is not divided. Therefore, by dividing the upper storage capacitor electrode only for the sub-pixel that is likely to cause a short circuit of the upper storage capacitor electrode, it is possible to suppress a decrease in the storage capacitor of the other adjacent sub-pixel.
- this invention may eliminate a short circuit by removing the short circuit part short-circuited by the following means.
- FIG. 15 is a plan view schematically showing the AM substrate 12f of the present embodiment
- FIG. 16 is a schematic view of the liquid crystal display panel 5 of the present embodiment along the XVI-XVI line in FIG. FIG.
- the liquid crystal display panel 5 includes an AM substrate 12f and a counter substrate 13 which are disposed to face each other, and a liquid crystal layer 14 provided between the substrates 12f and 13. ing.
- each storage capacitor wiring 7 has a slit portion 27a opened between the upper storage capacitor electrodes 25a and 25b and the upper storage capacitor electrodes 25c and 25d. Since other configurations and effects are the same as those of the AM substrate 12a described in the first embodiment, the description thereof is omitted. Note that the pattern shape of the slit portion 27a is appropriately adjusted according to the shapes of the upper storage capacitor electrodes 25a to 25d and the storage capacitor wiring 27 without being particularly limited to those shown in FIG.
- the counter substrate 13 has a multi-layered structure in which a color filter layer 37, a counter electrode 39, an alignment film (not shown), and the like are sequentially stacked on a substrate 31.
- the color filter layer 37 is provided between any one of R, G, and B colored layers 37a provided in a matrix corresponding to each pixel of the AM substrate 12f and each colored layer 37a.
- Black matrix 37b is arranged so as to overlap with the slit portion 27a provided in the AM substrate 12f.
- the liquid crystal display panel 5 is manufactured through an AM substrate manufacturing process, a counter substrate manufacturing process, and a liquid crystal display panel manufacturing process described below.
- the inspection process is performed after at least one of the AM substrate manufacturing process and the liquid crystal display panel manufacturing process. If a pixel defect is detected in the inspection process, the pixel defect is corrected after the inspection process. A process is added.
- a metal film such as titanium, chromium, aluminum, molybdenum, tantalum, tungsten, or copper, an alloy film thereof, or a laminated film thereof is formed on the entire substrate 31 such as glass or plastic.
- the substrate 31 such as glass or plastic.
- Thiickness 1000 A to 3000 A is formed by sputtering, and then patterned by photolithography (Photo Engraving Process, hereinafter referred to as “PEP technology”) to form the scanning signal line 22 and the gate.
- Electrode 32R and storage capacitor wiring 27 are formed.
- an inorganic insulating film such as silicon nitride or silicon oxide is formed on the entire substrate on which the scanning signal line 22 and the like are formed by a CVD (Chemical Vapor Deposition) method. Then, the gate insulating film 33 is formed.
- an intrinsic amorphous silicon film (thickness 1000A to 3000A) and an n + amorphous silicon film (thickness 400A to 700A) doped with phosphorus are formed on the entire substrate on the gate insulating film 33 by a CVD method.
- a PEP technique is used to form an island pattern on the gate electrode 32R to form a silicon laminate composed of an intrinsic amorphous silicon layer and an n + amorphous silicon layer.
- a metal film such as titanium, chromium, aluminum, molybdenum, tantalum, tungsten, copper, an alloy film thereof, or a laminated film (thickness) is formed on the entire substrate on which the silicon multilayer body is formed. (1000 A to 3000 A) is formed by sputtering, and then patterned by PEP technology to form the data signal line 23, connection electrodes 25R and 25L, and upper storage capacitor electrodes 25a to 25d (retention capacitor Electrode forming step).
- the n + amorphous silicon layer constituting the silicon laminate is removed by etching to form a channel portion, and the source electrode 36a and the drain electrode 36b A semiconductor layer having a gap is formed (channel portion forming step).
- the semiconductor layer may be formed of an amorphous silicon film as described above, but a polysilicon film may be formed, or laser annealing treatment is performed on the amorphous silicon film and the polysilicon film.
- the crystallinity may be improved. Thereby, the movement speed of electrons in the semiconductor layer is increased, and the characteristics of the TFT 24 can be improved.
- silicon nitride is formed on the entire substrate on which the data signal lines 23 and the like are formed by CVD
- a photosensitive acrylic resin (thickness 2 ⁇ m to 4 ⁇ m) is deposited by an inorganic insulating film such as silicon oxide (thickness 2000 A to 5000 A) or die coating (coating),
- An interlayer insulating film 38 is formed.
- portions of the interlayer insulating film 38 corresponding to the upper storage capacitor electrodes 25a to 25d are removed by etching to form contact holes 26a to 26d.
- the transparent substrate made of ITO (Indium Tin Oxide), IZO (Indium Zinc Oxide), zinc oxide, tin oxide or the like is formed on the entire substrate on the interlayer insulating film 38 in which the contact holes 26a to 26d are formed.
- a film (thickness 1000 A to 2000 A) is formed by sputtering, and then patterned by PE P technology to form pixel electrodes 21R and 21L.
- polyimide resin is applied to the entire substrate on the pixel electrodes 21R and 21L with a thickness of 500 A or more.
- Printed at 1000 A then baked, and rubbed in one direction with a rotating cloth to form the alignment film.
- the AM substrate 12f is manufactured (manufactured).
- a chromium thin film or a resin containing a black pigment is formed on the entire substrate 31 made of glass, plastic, or the like, and then patterned by the PEP technique to form the black matrix 37b.
- a red, green and blue layer, and a miscolored colored layer 37a are patterned to form a color filter.
- Layer 37 is formed.
- a transparent conductive film (thickness of about 1000A) made of ITO, ⁇ ⁇ , zinc oxide, tin oxide, or the like is formed on the entire substrate on the color filter layer 37 to form the counter electrode 39. To do.
- a polyimide resin is printed on the entire substrate on the counter electrode 39 at a thickness of 500 mm to 1000 mm, and then baked and rubbed in one direction with a rotating cloth to obtain an alignment film. Form.
- the counter substrate 13 can be manufactured as described above.
- a seal material made of a thermosetting epoxy resin or the like is screen-printed on one of the AM substrate 12f and the counter substrate 13 manufactured as described above, and a frame lacking a liquid crystal inlet portion.
- a spherical spacer made of plastic or silica having a diameter corresponding to the thickness of the liquid crystal layer 14 is sprayed on the other substrate.
- the AM substrate 12f and the counter substrate 13 are bonded together, and the sealing material is cured to produce an empty liquid crystal display panel.
- the liquid crystal display panel 5 is manufactured (manufactured).
- the position (short-circuit portion) where the short-circuit occurred is detected by performing an appearance inspection or an electro-optical inspection on the AM substrate 12f manufactured in the AM substrate manufacturing step.
- the appearance inspection is to optically inspect the wiring pattern with a CCD camera or the like
- the electro-optical inspection is after the modulator (electro-optical element) is installed so as to face the active matrix substrate.
- a wiring pattern is electro-optically inspected by applying a voltage between the active matrix substrate and the modulator and making light incident and capturing the change in luminance of the light with a CCD camera.
- the defect correction for removing the short-circuit portion is performed on the AM substrate 12f in which the short-circuit portion is detected.
- a method for correcting a short circuit when a short circuit occurs between the upper storage capacitor electrodes 25a and 25c of the AM substrate 12fa will be described with reference to FIG.
- the upper storage capacitor electrodes 25a and 25c that are short-circuited are separated by irradiating the film residue 98 that is a short-circuited part with a laser through the slit part 27a.
- the separated upper storage capacitor electrodes 25a and 25c function in the same manner as the upper storage capacitor electrodes 25a and 25c in the normal pixel.
- a YAG (Yttrium Aluminum Garnet) laser is used in order to cut the remaining film 98.
- the fourth harmonic (wavelength 266nm) is used. According to this, cutting of the short-circuit portion by laser irradiation can be performed with high accuracy.
- the width of the slit portion 27a is preferably 5 ⁇ m or more, and the area of the slit portion 27a is preferably 25 ⁇ m 2 or more.
- the width of the slit portion 27a is the length of the slit portion 27a in the direction in which the data signal line 23 extends.
- the width of the slit 27a is preferably 10 xm or more. Is preferably 100 xm 2 or more.
- the inspection step and the defect correction step are performed after the storage capacitor electrode forming step of forming the upper storage capacitor electrodes 25a to 25d in addition to the formation of the pixel electrodes 21R and 21L, or the channel portion. It may be carried out after the channel part forming step for forming. According to this, pixel defects can be corrected at an earlier stage of the manufacturing process, and the manufacturing yield of the AM substrate and the liquid crystal display panel can be further improved.
- a short-circuit portion is detected by performing a lighting test on the liquid crystal display panel 5 manufactured in the liquid crystal display panel manufacturing step. Specifically, for example, a gate inspection signal having a bias voltage of 10 V, a period of 16.7 msec, a pulse width of 50 ⁇ sec and a pulse voltage of +15 V is input to each scanning signal line 22 to turn on all TFTs 24. Further, a source detection signal having a potential of ⁇ 2 V whose polarity is inverted every 16.7 msec is input to each data signal line 23, and the pixel electrode 21 is connected via the source electrode 36a and the drain electrode 36b of each TFT24. Write a charge corresponding to ⁇ 2V.
- a counter electrode detection signal having a DC potential of 1 IV is input to the counter electrode 39 and the holding capacitor wiring 27.
- a voltage is applied to the liquid crystal capacitor formed between the pixel electrodes 21R and 21L and the counter electrode 39, and the storage capacitor element formed between the storage capacitor line 27 and the upper storage capacitor electrodes 25a to 25d.
- the pixel composed of the pixel electrodes 21R and 21L is turned on.
- short-circuit between the upper storage capacitor electrodes of adjacent pixels for example, between 25a and 25c.
- the pixel electrodes 21L and 21R become conductive, resulting in a connection defect. As a result, the position of the short-circuit portion is detected.
- defect correction for removing the short-circuit portion is performed on the AM substrate 12f in which the short-circuit portion is detected. Since the specific correction method is substantially the same as the above-described correction method using the AM board 12f, detailed description thereof will be omitted.
- modification on the AM substrate 12f the force that allowed laser irradiation from both the front and back surfaces of the AM substrate 12f.
- the substrate side of the AM substrate 12f Laser irradiation will be performed from the back side.
- the AM substrate 12f of the present embodiment when a short circuit occurs between the upper storage capacitor electrodes 25a and 25c and the upper storage capacitor electrodes 25b and 25d, the slit portion By performing laser irradiation on the film residue 98, which is a short-circuited portion, via 27a, pixel defects can be easily corrected, and the production yield of the AM substrate and the liquid crystal display panel can be improved.
- the storage capacitor wiring 27 is provided with a slit 27a. Therefore, the potential applied to the storage capacitor wiring 27 makes it difficult for the film residue 98 to be channeled, and the occurrence of connection defects can be suppressed without performing the laser correction as described above.
- the storage capacitor wiring 27 is not provided with the slit portion 27a, the storage capacitor wiring 27 functions as a gate electrode and each upper storage capacitor electrode functions as a source electrode and a drain electrode, respectively. As a result, the film residue 98 of the high-resistance semiconductor film is channeled, and conduction is made between the upper storage capacitor electrodes.
- FIG. 18 is a plan view schematically showing the AM substrate 12g of the present embodiment
- FIG. 19 is a cross-sectional view taken along the line XIX-XIX in FIG.
- the interlayer insulating film 38 has a two-layer structure of a lower first interlayer insulating film 38a and an upper second interlayer insulating film 38b.
- the insulating film 38 has a slit portion 38 c opened so as to overlap the slit portion 27 a of the storage capacitor wiring 27. Since other configurations and effects are the same as those of the AM substrate 12a described in the first embodiment, description thereof is omitted.
- the first interlayer insulating film 38a is formed by depositing an inorganic insulating film (thickness 2000A to 5000A) such as silicon nitride or silicon oxide by CVD, and the second interlayer insulating film is formed by die coating (coating). ) Method, a photosensitive acrylic resin (thickness 2 ⁇ m to 4 ⁇ m) is formed into a film.
- the slit portion 38c is formed simultaneously with the formation of the contact holes 26a to 26d corresponding to the upper storage capacitor electrodes 25a to 25d in the interlayer insulating film 38. Specifically, first, the photosensitive acrylic resin constituting the second interlayer insulating film 38 is patterned, and then the first interlayer insulating film is formed using the patterned photosensitive acrylic resin as a mask. By dry-etching the inorganic insulating film, the interlayer insulating film 38 having the contact holes 26a to 26d and the slit portions 38c is formed.
- the film residue 98 generated between the upper storage capacitor electrodes 25a to 25d can be removed. According to this, the short-circuit portion can be removed by normal etching without cutting the short-circuit portion by laser irradiation.
- FIG. 20 is a plan view schematically showing the AM substrate 12h of the present embodiment
- FIG. 21 is a cross-sectional view taken along the line XXI—XXI in FIG.
- the sub-pixel electrode 21R is arranged so as to overlap the slit 27a of the storage capacitor wiring 27. Since other configurations and effects are the same as those of the AM substrate 12a described in the first embodiment, the description thereof is omitted.
- the sub-pixel electrode 21R overlaps the slit 27a, so that laser irradiation is performed from the substrate side (back surface) of the AM substrate 12h. Further, when applied to a normally white mode liquid crystal display device, light leakage at the time of black display can be suppressed, so that a decrease in display quality and a decrease in aperture ratio can be suppressed.
- FIG. 22 is a block diagram showing the television apparatus 15 of the present embodiment.
- the television set 15 receives a television broadcast and receives a video signal. And a liquid crystal display device 10 for displaying an image based on a video signal supplied from the tuner unit 11.
- FIG. 23 is a block diagram showing the liquid crystal display device 10 of the present embodiment.
- the liquid crystal display device 10 includes a Y / C separation circuit 1 for separating a video signal supplied from a tuner unit 11 and the like into a luminance signal and a color signal, and a luminance signal and a color signal.
- a video taromar circuit 2 for converting the signal into R, G, and B analog RGB signals that are the three primary colors of light
- an AZD converter 3 for converting the analog RGB signal into a digital RGB signal
- a digital RGB signal The liquid crystal controller 4 that is input, and the digital RGB signal from the liquid crystal controller 4 is input at a predetermined timing, and substantially displays an image.
- a microcomputer 22 for controlling the entire system of the above configuration.
- the video signal supplied to the Y / C separation circuit 1 is supplied via a video signal captured by a camera, an Internet line, in addition to the video signal based on the television broadcast as described above.
- Various video signals such as video signals can be used.
- the television device 15 and the liquid crystal display device 10 having the above-described configuration can easily improve the manufacturing yield because the pixel defects are easily corrected and the AM substrate is provided.
- the AM substrate of the present invention can be used for liquid crystal display devices, inorganic or organic EL display devices, and the like. Further, the liquid crystal display device of the present invention can be used for various electric devices. For example, it can be used for mobile phones, PDAs (Personal Digital Assistance), personal computers, flat-screen TVs, medical displays, car navigation systems, amusement devices, and the like.
- PDAs Personal Digital Assistance
- personal computers flat-screen TVs
- medical displays car navigation systems, amusement devices, and the like.
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- Physics & Mathematics (AREA)
- Nonlinear Science (AREA)
- Engineering & Computer Science (AREA)
- Crystallography & Structural Chemistry (AREA)
- Mathematical Physics (AREA)
- Chemical & Material Sciences (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Power Engineering (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Liquid Crystal (AREA)
- Devices For Indicating Variable Information By Combining Individual Elements (AREA)
- Thin Film Transistor (AREA)
Abstract
Description
Claims
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
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EP05816826.1A EP1837842B1 (en) | 2004-12-16 | 2005-12-14 | Active matrix substrate, method for manufacturing active matrix substrate, display, liquid crystal display and television system |
US11/792,563 US7714948B2 (en) | 2004-12-16 | 2005-12-14 | Active matrix substrate, method for fabricating active matrix substrate, display device, liquid crystal display device, and television device |
JP2006548873A JP4484881B2 (ja) | 2004-12-16 | 2005-12-14 | アクティブマトリクス基板、表示装置、液晶表示装置およびテレビジョン装置 |
US12/382,799 US7768584B2 (en) | 2004-12-16 | 2009-03-24 | Active matrix substrate, method for fabricating active matrix substrate, display device, liquid crystal display device, and television device |
US12/458,215 US8089571B2 (en) | 2004-12-16 | 2009-07-02 | Active matrix substrate, method for fabricating active matrix substrate, display device, liquid crystal display device, and television device |
Applications Claiming Priority (4)
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JP2004364498 | 2004-12-16 | ||
JP2004-364498 | 2004-12-16 | ||
JP2005295015 | 2005-10-07 | ||
JP2005-295015 | 2005-10-07 |
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US11/792,563 A-371-Of-International US7714948B2 (en) | 2004-12-16 | 2005-12-14 | Active matrix substrate, method for fabricating active matrix substrate, display device, liquid crystal display device, and television device |
US12/382,799 Division US7768584B2 (en) | 2004-12-16 | 2009-03-24 | Active matrix substrate, method for fabricating active matrix substrate, display device, liquid crystal display device, and television device |
US12/458,215 Division US8089571B2 (en) | 2004-12-16 | 2009-07-02 | Active matrix substrate, method for fabricating active matrix substrate, display device, liquid crystal display device, and television device |
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WO2006064832A1 true WO2006064832A1 (ja) | 2006-06-22 |
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US (3) | US7714948B2 (ja) |
EP (2) | EP1837842B1 (ja) |
JP (4) | JP4484881B2 (ja) |
CN (1) | CN100481156C (ja) |
WO (1) | WO2006064832A1 (ja) |
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US20090225247A1 (en) | 2009-09-10 |
JP2009104179A (ja) | 2009-05-14 |
EP1837842B1 (en) | 2014-01-22 |
JP2008203889A (ja) | 2008-09-04 |
JP4713646B2 (ja) | 2011-06-29 |
JP2008287290A (ja) | 2008-11-27 |
US8089571B2 (en) | 2012-01-03 |
US20090268116A1 (en) | 2009-10-29 |
JP4288303B2 (ja) | 2009-07-01 |
CN100481156C (zh) | 2009-04-22 |
EP1837842A4 (en) | 2008-04-09 |
US7768584B2 (en) | 2010-08-03 |
JP4484881B2 (ja) | 2010-06-16 |
US7714948B2 (en) | 2010-05-11 |
JPWO2006064832A1 (ja) | 2008-06-12 |
US20080002076A1 (en) | 2008-01-03 |
EP1837842A1 (en) | 2007-09-26 |
JP4245650B2 (ja) | 2009-03-25 |
EP2246836A1 (en) | 2010-11-03 |
CN101080756A (zh) | 2007-11-28 |
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