WO2011007479A1 - アクティブマトリクス基板およびアクティブマトリクス型表示装置 - Google Patents
アクティブマトリクス基板およびアクティブマトリクス型表示装置 Download PDFInfo
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- WO2011007479A1 WO2011007479A1 PCT/JP2010/002460 JP2010002460W WO2011007479A1 WO 2011007479 A1 WO2011007479 A1 WO 2011007479A1 JP 2010002460 W JP2010002460 W JP 2010002460W WO 2011007479 A1 WO2011007479 A1 WO 2011007479A1
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- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
- G09G3/3611—Control of matrices with row and column drivers
- G09G3/3674—Details of drivers for scan electrodes
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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
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1345—Conductors connecting electrodes to cell terminals
- G02F1/13452—Conductors connecting driver circuitry and terminals of panels
-
- 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
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1345—Conductors connecting electrodes to cell terminals
- G02F1/13454—Drivers integrated on the active matrix substrate
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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
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1345—Conductors connecting electrodes to cell terminals
- G02F1/13458—Terminal pads
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
- G09G3/3611—Control of matrices with row and column drivers
- G09G3/3674—Details of drivers for scan electrodes
- G09G3/3677—Details of drivers for scan electrodes suitable for active matrices only
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
- H10K59/10—OLED displays
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
- H10K59/10—OLED displays
- H10K59/12—Active-matrix OLED [AMOLED] displays
- H10K59/131—Interconnections, e.g. wiring lines or terminals
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L27/00—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate
- H01L27/02—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components specially adapted for rectifying, oscillating, amplifying or switching and having potential barriers; including integrated passive circuit elements having potential barriers
- H01L27/12—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components specially adapted for rectifying, oscillating, amplifying or switching and having potential barriers; including integrated passive circuit elements having potential barriers the substrate being other than a semiconductor body, e.g. an insulating body
- H01L27/1214—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components specially adapted for rectifying, oscillating, amplifying or switching and having potential barriers; including integrated passive circuit elements having potential barriers the substrate being other than a semiconductor body, e.g. an insulating body comprising a plurality of TFTs formed on a non-semiconducting substrate, e.g. driving circuits for AMLCDs
- H01L27/124—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components specially adapted for rectifying, oscillating, amplifying or switching and having potential barriers; including integrated passive circuit elements having potential barriers the substrate being other than a semiconductor body, e.g. an insulating body comprising a plurality of TFTs formed on a non-semiconducting substrate, e.g. driving circuits for AMLCDs with a particular composition, shape or layout of the wiring layers specially adapted to the circuit arrangement, e.g. scanning lines in LCD pixel circuits
Definitions
- the present invention relates to an active matrix substrate in which a drive circuit and its wiring are monolithically formed, and an active matrix display device using the substrate.
- active matrix display devices using active elements such as TFTs typified by liquid crystal display devices and organic EL display devices, which are rapidly spreading in place of cathode ray tubes (CRT), are energy-saving, thin, lightweight, etc. Utilizing its features, it is widely used in TVs, monitors, mobile phones, etc.
- active elements such as TFTs typified by liquid crystal display devices and organic EL display devices, which are rapidly spreading in place of cathode ray tubes (CRT)
- CTR cathode ray tubes
- liquid crystal display devices equipped in small and medium electronic devices such as mobile phones and laptop computers are beginning to adopt gate driver monolithic (GDM) technology using amorphous silicon in order to reduce costs.
- GDM gate driver monolithic
- the range of use is expanding from small to medium-sized products such as televisions.
- Patent Document 1 describes a liquid crystal display device substrate in which a pixel transistor in a display region and various transistors in a gate drive circuit region are formed using an amorphous silicon thin film.
- the drain electrode of the pixel transistor and the pixel electrode are electrically connected through a contact hole formed in the passivation film, It has a so-called Pixel On Passivation configuration in which a pixel electrode is provided on the passivation film.
- the pixel transistor is formed of a bottom gate type.
- the pixel electrode 140 of the same layer is formed on the passivation film 180.
- the gate drive circuit provided in the gate drive circuit region and its wiring are formed simultaneously with the display region by using the five (four) mask process used for forming the display region, the gate drive is performed. It is described that the manufacturing cost can be reduced because the circuit region can be integrated on the substrate without adding a separate process.
- FIG. 12 is a plan view showing a gate drive circuit region of the liquid crystal display device substrate.
- a drive transistor of a shift register is formed in a portion (right end in the figure) adjacent to a display area (not shown) in the gate drive circuit area, which is farthest from the display area.
- a wiring region in which a plurality of main wirings 150 for applying signals to the respective shift registers are formed.
- control transistor is formed between the wiring region and the region where the driving transistor is formed.
- branch wiring 160 for connecting the main wiring 150 to the drive transistor and the control transistor of each shift register is formed in a different layer from the main wiring 150.
- the main wiring 150 is formed of the same layer as the gate wiring pattern (gate pattern), and the branch wiring 160 is formed of the same layer as the data wiring pattern (data pattern).
- FIG. 13 is a cross-sectional view taken along the line C-C ′ of FIG. 12 and shows a state of a connection portion between the main wiring 150 and the branch wiring 160.
- an insulating film 170 is provided between the main wiring 150 and the branch wiring 160, and a passivation film 180 is formed so as to cover the branch wiring 160 and the insulating film 170. Has been.
- the hole formed in the insulating film 170 and the passivation film 180 so that the main wiring 150 is partially exposed is the first contact hole 190, while the passivation film is exposed so that the branch wiring 160 is partially exposed.
- a hole formed in 180 is the second contact hole 200.
- the main wiring 150 and the branch wiring 160 have an intersection in the wiring area, but there is an intersection in the connection shown in FIG. do not do.
- the main wiring 150 and the branch wiring 160 are electrically connected by the electrode 140 in the same layer as the pixel electrode formed in the first contact hole 190 and the second contact hole 200 described above.
- the branch wiring 160 is provided with a narrower line width than the main wiring 150, and a pixel transistor in a display region not shown is a bottom gate type.
- the formation layer of the main wiring 150 is lower than the formation layer of the branch wiring 160.
- the following phenomenon is likely to occur at a location where the branch wiring 160 intersects the main wiring 150, that is, a location where the branch wiring 160 crosses the main wiring 150.
- the branch wiring 160 Since the taper portion of the main wiring 150 which is the lower layer film is not flat, the branch wiring 160 is likely to be disconnected due to the wraparound of the etchant when the branch wiring 160 is etched.
- the line width variation of the branch wiring 160 is likely to occur, and the influence of such line width variation is large in the branch wiring 160 provided with a narrow line width, and also affects the display quality.
- the main wiring 150 having a large line width is formed in the same layer as the data pattern, and the branch wiring 160 having a small line width is formed in the same layer as the gate pattern.
- the interval between the main wirings 150 cannot be narrowed for the following reason.
- the gate drive circuit area is widened and the frame area is increased in the liquid crystal display substrate.
- FIG. 14 shows a gate drive circuit to which the configuration of the connecting portion of Patent Document 1 is applied when the main wiring 150 is formed in the same layer as the data pattern and the branch wiring 160 is formed in the same layer as the gate pattern. ing.
- the formation layer of the branch wiring 160 is lower than the formation layer of the main wiring 150.
- the first contact hole 190 formed so as to expose a part of the main wiring 150 and the first contact hole 190 formed so as to expose a part of the branch wiring 160 are exposed.
- Two contact holes 200 are formed, and the main wiring 150 and the branch wiring 160 are connected by the electrode 140 in the same layer as the pixel electrodes formed in the contact holes 190 and 200.
- the second contact hole 200 is spaced from the main wiring 150. W.
- the second contact hole 200 when the second contact hole 200 is provided below the main wiring 150, it is difficult to form the electrode 140 in the same layer as the pixel electrode in the second contact hole 200. It becomes difficult to connect the main wiring 150 and the branch wiring 160 by using the configuration of the connecting portion.
- the second contact holes 200 are disposed at the interval W between the main wirings 150, and the presence of the second contact holes 200 makes it difficult to reduce the interval W between the main wirings 150. .
- the present invention has been made in view of the above problems, and an object of the present invention is to provide an active matrix substrate in which disconnection failure and line width abnormality are unlikely to occur and expansion of a drive circuit region can be suppressed.
- an active matrix substrate of the present invention includes an insulating substrate, a TFT element formed on the insulating substrate, and a pixel electrode electrically connected to the TFT element in a matrix.
- An active matrix substrate having a display area and a peripheral area provided with a drive circuit for driving the TFT element, wherein the peripheral area of the display area is the peripheral area, and the peripheral area Includes a plurality of branch wirings electrically connected to the drive circuit, and further includes a trunk wiring electrically connected to one of the branch wirings. Is provided with a plurality of electrode layers, and the branch wiring and the trunk wiring are formed of the same electrode layer as the electrode layer, and the branch wiring is provided in the TFT element.
- the electrode layer is formed of an electrode layer below the electrode layer forming the trunk wiring, and an insulating layer is provided between the trunk wiring and the branch wiring, and the trunk wiring and the branch Another one of the wirings intersects, and the line width of the trunk wiring at the intersection is wider than the line width of the branch wiring, and the trunk wiring and the branch wiring In a region where one of them is electrically connected, the trunk wiring and the branch wiring overlap in plan view, and one of the branch wirings is exposed in the insulating layer.
- a contact hole is formed, and one of the branch wirings and the trunk wiring are electrically connected through a connection conductor provided in the contact hole.
- the trunk line having a wide line width is provided in an upper layer than the branch line having a narrow line width.
- the branch wiring is formed by an electrode layer below the electrode layer forming the trunk wiring in a plurality of electrode layers provided in the TFT element.
- the trunk line with a wide line width is configured to overcome the step formed by the branch line with a narrow line width, disconnection failure hardly occurs and the yield can be improved.
- the line width of the branch wiring existing in the lower layer is narrow, nonuniformity of the reflected light and the resist film thickness of the stepped portion can be suppressed, and the patterning accuracy can be improved.
- a trunk wiring having a wide line width is formed by the photolithographic process of the trunk wiring, which is inferior in patterning accuracy compared to the photolithography process of the branch wiring due to the influence of the branch wiring existing in the lower layer Therefore, even if the line width varies, the influence of the variation is not great.
- the trunk wiring and the branch wiring are overlapped in plan view through the insulating layer, A contact hole is formed in the insulating layer so that the branch wiring is exposed, and the branch wiring and the trunk wiring are electrically connected via a connection conductor provided in the contact hole. ing.
- a matrix substrate can be realized.
- the active matrix display device of the present invention is characterized by including the active matrix substrate in order to solve the above-described problems.
- an active matrix display device with high display quality and high reliability can be realized.
- the peripheral area of the display area is the peripheral area, and the peripheral area includes a plurality of branch lines electrically connected to the drive circuit.
- a trunk wiring electrically connected to one of the branch wirings, and the TFT element includes a plurality of electrode layers, and the branch wiring and the trunk wiring are
- the branch wiring is formed by an electrode layer lower than the electrode layer forming the trunk wiring in a plurality of electrode layers provided in the TFT element.
- an insulating layer is provided between the trunk wiring and the branch wiring, and the trunk wiring and another one of the branch wirings intersect with each other.
- the line width of the trunk wiring is In the region where the trunk wiring and one of the branch wirings are electrically connected, the trunk wiring and the branch wiring are overlapped in plan view.
- a contact hole is formed in the insulating layer so that one of the branch wirings is exposed, and one of the branch wirings and the trunk wiring are connected to each other in the contact hole. It is the structure electrically connected through the conductor.
- FIG. 3 is a partially enlarged view showing a region where a gate drive circuit signal wiring is formed in the TFT array substrate of one embodiment of the present invention.
- (A) is a cross-sectional view taken along the line AA ′ in the region where the main wiring and the branch wiring are connected in the region where the signal wiring for the gate driving circuit shown in FIG. 1 is formed, and
- (b) It is sectional drawing which shows an example of the form. It is a figure which shows the patterning shape of the trunk wiring with which the said TFT array substrate was equipped. It is a figure which shows schematic structure of the said TFT array substrate. It is a figure which shows the modification of the patterning shape of trunk wiring. It is a figure which shows the further another modification of trunk wiring and branch wiring.
- FIG. 10 is a cross-sectional view taken along the line B-B ′ in a region where the main wiring and the branch wiring are connected in the region where the gate driving circuit signal wiring shown in FIG. It is the elements on larger scale which show the area
- FIG. 13 is a cross-sectional view taken along the line C-C ′ of FIG. 12 and shows a state of a connection portion between the main wiring and the branch wiring.
- a gate drive circuit region when the main wiring formed in the same layer as the data pattern and the branch wiring formed in the same layer as the gate pattern are connected using the configuration of the connecting portion shown in FIG. FIG.
- FIG. 4 is a diagram showing a schematic configuration of the TFT array substrate 1.
- the TFT array substrate 1 is provided with a display region R1 and a peripheral region R2 located around the display region R1.
- pixel TFT elements 2 and pixel electrodes 3 connected to the pixel TFT elements 2 are provided in a matrix.
- the pixel TFT element 2 includes a gate bus line GL and a gate electrode layer 5, a gate insulating film 6, an amorphous silicon film 7 as a semiconductor film, a source electrode on an insulating substrate 4. 8a, the drain electrode 8b, and the source / drain electrode layer 8 forming the data bus line DL, the insulating layer 10 in which the contact hole 9 is formed, and the drain electrode 8b through the contact hole 9.
- the pixel electrodes 3 are stacked in order.
- the pixel TFT element 2 is formed in a bottom gate type, but the present invention is not limited to this and may of course be a top gate type.
- the peripheral region R2 is provided with a gate drive circuit 11 and a second terminal portion 12 described later connected to an external source drive circuit (not shown).
- the gate driving circuit 11 is connected to the gate bus line GL, and the source driving circuit is connected to the data bus line DL via the second terminal portion 12, and controls the pixel TFT element 2 according to a signal from the outside. It is supposed to be.
- a trunk line such as a clock signal line or a power supply voltage line, and a branch connecting the trunk line and the gate drive circuit 11 are connected.
- a gate driving circuit signal wiring 13 made of wiring is provided.
- the gate drive circuit 11, the second terminal portion 12, and the gate drive circuit signal wiring 13 are monolithically formed in the peripheral region R2 of the TFT array substrate 1.
- FIG. 1 is a partially enlarged view showing a region in the TFT array substrate 1 where a gate drive circuit signal wiring 13 is formed.
- the gate drive circuit signal wiring 13 is composed of a trunk wiring 13a and a branch wiring 13b connecting the trunk wiring 13a and the gate driving circuit 11.
- the gate drive circuit 11 is composed of a plurality of stages, and a plurality of branch lines 13b respectively connected to a plurality of different trunk lines 13a are connected to one stage.
- FIG. 1 shows a configuration in which four branch wirings 13b respectively connected to four different trunk wirings 13a are connected to the respective stages constituting the gate drive circuit 11 as an example.
- the pixel TFT element 2 shown in FIG. 4 is a bottom gate type in which the gate electrode layer 5 is formed below the source / drain electrode layer 8.
- the branch electrode 13 b is formed of the drain electrode layer 8, and the branch wiring 13 b is formed of the gate electrode layer 5.
- the trunk wiring 13 a is formed by the gate electrode layer 5
- the branch wiring 13 b is formed by the source / drain electrode layer 8.
- the branch wiring 13b may be formed of an electrode layer below the electrode layer forming the trunk wiring 13a in the plurality of electrode layers provided in the pixel TFT element 2.
- the branch wiring 13b is desired to be thinned from the viewpoint of reducing the load, and the number of the branch wiring 13b is also increasing in order to realize a high-definition display screen. Formed in width.
- the number of branch lines 13b is further increased.
- the branch wiring 13b is formed with a line width narrower than the line width of the main wiring 13a.
- FIG. 2A shows an AA ′ cross section in a region where the trunk wiring 13a and the branch wiring 13b shown in FIG. 1 are connected, and FIG. 2B shows an example of another connection form.
- FIG. 2A shows an AA ′ cross section in a region where the trunk wiring 13a and the branch wiring 13b shown in FIG. 1 are connected
- FIG. 2B shows an example of another connection form.
- the trunk wiring 13a and the branch wiring 13b are regions where the trunk wiring 13a and the branch wiring 13b are connected, and overlap in plan view.
- a gate insulating film 6 is provided as an insulating layer between the wiring 13a and the branch wiring 13b.
- FIG. 3 is a diagram showing a patterning shape of the main wiring 13a.
- the gate insulating film 6 and the main wiring 13 a are connected to the main wiring 13 a and the branch wiring 13 b in the region where the main wiring 13 a and the branch wiring 13 b are connected.
- a contact hole (a hole formed in the gate insulating film 6) and a through hole 13h (a hole formed in the main wiring 13a) are formed so that is exposed.
- the contact hole and the through hole 13h are formed in different shapes, but may be formed in the same shape.
- an insulating layer 10 is formed so as to cover the trunk wiring 13a, and at least a part of the insulating layer 10 overlaps with the contact hole and the through hole 13h.
- second contact hole 13h ′ is formed.
- the same layer as the pixel electrode 3 is used as the connection conductor 14, and the trunk wiring 13a and the branch wiring 13b are connected.
- ITO Indium Tin Oxide
- a transparent conductive film such as IZO (Indium Zinc Oxide)
- the conductive film is not limited to this as long as it can electrically connect the trunk wiring 13a and the branch wiring 13b.
- FIG. 2B shows an example of another connection form in the region where the main wiring 13a and the branch wiring 13b are connected.
- the semiconductor film 7 may be formed so as to protrude from the lower layer of the main wiring 13a (to the extent that the gate insulating film 6 protrudes from the main wiring 13a).
- the semiconductor film 7 protruding from the lower layer of the main wiring 13a serves as a barrier layer, and protects the gate insulating film 6 which is the lower layer, so that it is shown in FIG. As shown, the gate insulating film 6 can be formed in a staircase shape.
- the stepped shape of the connection conductor 14 (pixel electrode 3) can be reduced by the step shape.
- the semiconductor film 7 serving as the barrier layer is formed by a process of forming a semiconductor film provided in the pixel TFT element 2, and therefore does not increase the number of process steps.
- the semiconductor film 7 remains in the region covered with the main wiring 13a after the gate insulating film 6 is etched, but is covered with the main wiring 13a. In a region that is not present, it may disappear or remain as a thin film ((b) in FIG. 2 shows the case of disappearance).
- the contact hole 13h is formed in the gate insulating film 6 so that the branch wiring 13b is exposed, and the connection conductor 14 is provided in the contact hole 13h so as to be connected to the branch wiring 13b.
- the trunk wiring 13a and the branch wiring 13b can also be connected by providing the trunk wiring 13a so as to be connected to the connection conductor 14.
- the trunk wiring 13a and the branch wiring 13b can be directly connected by the trunk wiring 13a.
- FIG. 1 shows a case where the same layer as the pixel electrode 3 is used as the connection conductor 14.
- the photomask for forming the gate bus line GL and the gate electrode layer 5, the photomask for forming the amorphous silicon film 7, the photomask for forming the data bus line DL and the source / drain electrode layer 8, and the insulating layer 10 are formed.
- the pixel TFT element 2 provided with the pixel electrode 3 and the signal wiring 13 for the gate driving circuit are obtained by a five-mask manufacturing process in which five photomasks of the photomask for forming the pixel electrode 3 and the photomask for forming the pixel electrode 3 are used. They can be simultaneously formed on the TFT array substrate 1.
- the amorphous silicon film 7 formation photomask is a halftone mask whose exposure amount can be controlled, the amorphous silicon film 7 formation photomask, the data bus line DL and the source / drain electrode layer 8 formation photomask, Are provided with patterns corresponding to the contact holes 13h formed in the gate insulating film 6 and the main wiring 13a, respectively.
- the halftone mask By using the halftone mask, a resist film is not formed on the contact hole 13h forming portion in the gate insulating film 6, and the gate insulating film 6 and the amorphous silicon film 7 need to be left on the region.
- the resist film is formed thick, and the resist film is thinly formed on the region where only the amorphous silicon film 7 is removed and the gate insulating film 6 needs to be left, and etching is performed using the resist film as a mask.
- the signal wiring 13 for the gate driving circuit can be formed by the five-mask manufacturing process.
- the photomask for forming the amorphous silicon film 7 and the photomask for forming the data bus line DL and the source / drain electrode layer 8 are integrated.
- the gate drive circuit signal wiring 13 can also be formed by the sheet mask manufacturing process.
- the amorphous silicon film 7 is used as the semiconductor film, but the present invention is not limited to this, and amorphous germanium, amorphous silicon / germanium, amorphous silicon / carbide, etc. May be used.
- polycrystalline silicon, polycrystalline germanium, polycrystalline silicon / germanium, polycrystalline silicon / carbide, or the like can be used as the semiconductor film.
- the main wiring 13a that is, the source / drain electrode layer 8
- the main wiring 13a can be formed of Al alloy, Mo, or a film in which these are laminated, but is not limited thereto. , Ta, W, Ti, Mo, Al, Cu, Cr, Nd, etc., or an alloy material or compound material containing the element as a main component, and may be formed as a laminated structure as necessary. .
- the toothpick wiring 13b that is, the gate electrode layer 5
- the gate electrode layer 5 can be formed of, for example, an Al alloy, but is not particularly limited, and may be Ta, W, Ti, Mo, Al, Cu, Cr, Nd, or the like. You may form with the selected element or the alloy material or compound material which has the said element as a main component.
- a semiconductor film typified by polycrystalline silicon may be doped with impurities such as phosphorus and boron.
- the branch wiring 13b is a single layer Al alloy film
- the edge portion is likely to be cut off, and the wiring over the wiring having such a shape is likely to be disconnected.
- the gate insulating film 6 for example, an inorganic film such as SiNx or SiOx can be used, but is not limited thereto.
- the insulating layer 10 can be formed of an inorganic film such as SiNx having a thickness of about 0.2 ⁇ m to 0.8 ⁇ m, but is not particularly limited, and is formed of an inorganic film such as SiOx or SiON. May be. Further, not only an inorganic film but also an organic film such as a photosensitive transparent acrylic resin having a thickness of about 1 ⁇ m to 4 ⁇ m can be used. Furthermore, a laminated structure of an inorganic film and an organic film may be used.
- the trunk line 13a having a large line width is provided in a layer above the branch line 13b having a narrow line width, and the trunk line 13a having a wide line width is provided. Since it is configured to overcome the step formed by the branch wiring 13b having a narrow line width, disconnection failure hardly occurs and the yield can be improved.
- the line width of the branch wiring 13b existing in the lower layer is narrow, it is possible to suppress the unevenness of the reflected light and the resist film thickness formed on the stepped portion, and the patterning accuracy Can be improved.
- the trunk wiring 13a having a wide line width is formed depending on the photolithography process of the trunk wiring 13a, which has inferior patterning accuracy compared to the photolithography process of the branch wiring 13b. Even if the line width varies, the influence of the variation is small.
- the line width variation of the trunk wiring 13a formed by the photolithography process of the trunk wiring 13a which is inferior in patterning accuracy compared to the photolithography process of the branch wiring 13b, is ⁇ 1 ⁇ m, for example.
- the line width (50 ⁇ m) of the main wiring 13a is formed to be ten times thicker than the line width (5 ⁇ m) of the branch wiring 13b, so that the influence of the variation is small.
- the trunk wiring 13a and the branch wiring 13b overlap with each other in plan view through the gate insulating film 6.
- the wiring 13a and the gate insulating film 6 are formed so that the branch wiring 13b is exposed, and the trunk wiring 13a and the branch wiring 13b are connected by the connection conductor 14.
- the trunk wiring 150 and the branch wiring 160 illustrated in FIG. 14 cannot be overlapped in the connection region. Compared to the interval W between the trunk wirings 150 in the conventional configuration already described above, in the configuration of FIG. The interval W1 between 13a can be reduced.
- the interval W1 between the main wirings 13a can be shortened, and an increase in the peripheral region R2 where the gate driving circuit signal wirings 13 are formed can be suppressed.
- FIG. 5 is a diagram showing a modification of the patterning shape of the main wiring 13a.
- the trunk wiring 13a is preferably formed in a straight line having the same width and the same interval.
- the region where the trunk wiring 13a and the branch wiring 13b are connected is arranged in the lower layer of the trunk wiring 13a.
- the interval W2 between the main wirings 13a can be further reduced, and an increase in the peripheral region R2 where the gate driving circuit signal wirings 13 are formed can be further suppressed.
- the sealing material can be uniformly cured without unevenness, and thus it is possible to suppress the occurrence of a reliability problem due to an uncured component from the sealing material.
- FIG. 6 is a diagram showing still another modified example of the trunk wiring 13a and the branch wiring 13b.
- a plurality of trunk lines 13 a are provided, and the gate drive is further performed than the trunk line 13 a disposed farthest from the gate drive circuit 11 in the trunk line 13 a.
- a second trunk wiring 15 is provided at a position away from the circuit 11, and the second trunk wiring 15 and the second branch wiring 15 a that connects the second trunk wiring 15 and the gate drive circuit 11 are provided. Is preferably formed in the same layer as the branch wiring 13 b which is the same layer as the gate bus line GL and the gate electrode layer 5.
- the branch wiring that is in the same layer as the gate electrode layer 5 is arranged. It can be formed in the same layer as 13b.
- the second trunk wiring 15 and the second branch wiring 15a that connects the second trunk wiring 15 and the gate drive circuit 11 are both formed in the same layer as the branch wiring 13b.
- a separate contact hole for connecting the second trunk wiring 15 and the second branch wiring 15a becomes unnecessary, and the yield can be improved.
- the second trunk wiring 15 and the second branch wiring 15a are formed by patterning of the same layer, a reduction in resistance can be realized.
- the third position closer to the gate drive circuit 11 than the trunk line 13 a disposed closest to the gate drive circuit 11 is the third line.
- the trunk wiring 16 is provided, and the third trunk wiring 16 and the third branch wiring 16 a that connects the third trunk wiring 16 and the gate drive circuit 11 are the same layer as the source / drain electrode layer 8. It is preferable that the main wiring 13a is formed in the same layer.
- the third trunk wiring 16 and the third branch wiring 16a do not intersect with the trunk wiring 13a formed in the same layer as the source / drain electrode layer 8 because of the arrangement thereof.
- the main wiring 13a which is the same layer as the electrode layer 8, can be formed in the same layer.
- the third trunk wiring 16 and the third branch wiring 16a are both formed in the same layer as the trunk wiring 13a, the third trunk wiring 16 and the third branch wiring 16a are connected. Therefore, a separate contact hole is not required, and the yield can be further improved.
- the third branch wiring 16a is formed in the same layer as the source / drain electrode layer 8, the third branch wiring 16a is connected to the source electrode or drain electrode of the transistor provided in the gate drive circuit 11. When doing so, there is no need to provide a separate switching member.
- FIG. 7 is a diagram showing still another modified example of the trunk wiring 13a.
- the plurality of trunk wirings 13a are formed by partially laminating wirings formed of the same layer as the branch wirings 13b and the same layer as the pixel electrodes 3. It is formed in a layer structure, and the trunk wiring 13a and the wiring are electrically connected.
- the shape of the branch wiring 13b formed below the trunk wiring 13a is larger than that of FIG.
- the same layer as the pixel electrode 3 is used as the connection conductor 14, and the trunk wiring 13a and the branch wiring 13b are connected.
- connection points are formed on the branch wiring 13b formed below the trunk wiring 13a, and a total of four connection points are provided on one trunk wiring 13a. If the above effect is obtained, the number of the connection points is not particularly limited.
- the plurality of trunk wirings 13a are formed by a multi-layer structure in which wirings formed by the same layer as the branch wiring 13b and / or the same layer as the pixel electrode 3 are partially stacked, that is, It is preferable that the trunk wiring 13a and the wiring are electrically connected.
- the trunk line 13a partially has a multi-layer structure, so that it is possible to further reduce the resistance.
- the second trunk wiring 15 is formed by stacking wirings formed of the same layer as the trunk wiring 13a and / or the same layer as the pixel electrode 3 which are the same layer as the source / drain electrode layer 8, that is, a multi-layer. It is preferable that the second trunk wiring 15 and the wiring are electrically connected.
- the second trunk wiring 15 is configured in the same layer as the trunk wiring 13 a and has a contact hole 13 h and has substantially the same shape as the second trunk wiring 15.
- Layer 17 is formed.
- connection conductor 14 the same layer as the pixel electrode 3 is used as the connection conductor 14, and the second trunk wiring 15 and the layer 17 are connected.
- connection points are provided on one second trunk wiring 15.
- the signal input end portion and the termination portion are provided.
- Two points may be provided one by one, and the number of the connection points is not particularly limited.
- the second trunk wiring 15 since the second trunk wiring 15 has a multi-layer structure, it is possible to further reduce the resistance.
- FIG. 2 a second embodiment of the present invention will be described based on FIG.
- the present embodiment is different from the first embodiment in that terminal portions 18 respectively connected to the trunk wiring 13a, the second trunk wiring 15, and the third trunk wiring 16 are provided.
- the configuration is as described in the first embodiment.
- members having the same functions as those shown in the drawings of the first embodiment are given the same reference numerals, and descriptions thereof are omitted.
- terminal portions 18 connected to the trunk wiring 13a, the second trunk wiring 15 and the third trunk wiring 16 and for inputting signals from the outside are all formed of the same material.
- FIG. 8 shows an example in which all the terminal portions 18 are formed in the same layer as the branch wiring 13 b which is the same layer as the gate electrode layer 5.
- the second trunk wiring 15 is formed in the same layer as the branch wiring 13 b that is the same layer as the gate electrode layer 5, and is connected to the second trunk wiring 15.
- the part 18 is also formed in the same layer as the branch wiring 13b.
- the terminal portion 18 formed in the same layer as the gate electrode layer 5 is electrically connected.
- the structure to connect is required.
- connection conductor 14 is extended from the plurality of trunk wires 13 a and the third trunk wires 16 and the terminal portion 18. It is connected to the extended wiring.
- conductive particles of about 3 ⁇ m to 5 ⁇ m are used for connection between the terminal portion 18 and an external circuit that inputs a signal to the terminal portion 18. A difference arises and the problem that a poor contact tends to occur arises.
- the terminal portion 18 is formed of the same layer as the gate electrode layer 5 made of the same material, such a problem does not occur.
- all the terminal portions 18 are formed of the same layer as the gate electrode layer 5, but it is needless to say that they can be formed of the same layer as the source / drain electrode layer 8.
- the terminal portion 18 includes an upper electrode 18a and a lower electrode 18b.
- the lower electrode 18b is formed of the same layer as the gate electrode layer 5, and the upper electrode 18a is the same layer as the source / drain electrode layer 8.
- the pixel electrode 3 is formed in the same layer, and the upper electrode 18a and the lower electrode 18b are electrically connected.
- the lower electrode 18b is formed of the same layer as the gate electrode layer 5
- the upper electrode 18a is formed of the same layer as the pixel electrode 3
- the upper electrode 18a and the lower electrode are connected via the contact hole 18h. 18b is electrically connected.
- the upper electrode 18a of the terminal portion 18 is formed of the same layer as the pixel electrode 3, and the lower electrode 18b is formed of the same layer as the gate electrode layer 5. There is no need to add a separate process for forming.
- terminal portion 18 and, for example, the second terminal portion 12 for inputting another signal from the outside illustrated in FIG. 4 are formed of the same material.
- the upper electrode 18 a of the terminal portion 18 and the second terminal portion 12 is formed in the same layer as the pixel electrode 3, and the lower electrode 18 b is formed in the same layer as the gate electrode layer 5.
- the terminal portions 12 and 18 provided in the TFT array substrate 1 are all formed of the same material, when performing the above-described problem of poor contact or indentation inspection of conductive particles, There is no problem that the criterion is complicated.
- FIG. 9 a third embodiment of the present invention will be described based on FIG. 9 and FIG.
- the present embodiment is different from the first embodiment in that the exposed branch wiring 13b and the trunk wiring 13a are directly connected, and the other configurations are as described in the first embodiment. is there.
- members having the same functions as those shown in the drawings of the first embodiment are given the same reference numerals, and descriptions thereof are omitted.
- FIG. 9 shows another gate drive circuit signal wiring 13 provided on the TFT array substrate 1.
- FIG. 10 is a cross-sectional view taken along the line B-B ′ of FIG. 9 and shows a state of a connection portion between the main wiring 13a and the branch wiring 13b.
- the trunk wiring 13 a is formed of the same layer as the source / drain electrode layer 8, and the branch wiring 13 b connected to the gate drive circuit 11 is connected to the gate electrode layer 5. Are formed in the same layer.
- a gate insulating film 6 is provided between the trunk wiring 13a and the branch wiring 13b.
- the trunk wiring 13a and the branch wiring 13b overlap each other in a plan view.
- a contact hole 6h is formed in the gate insulating film 6 so that the wiring 13b is exposed.
- the exposed branch wiring 13b and the trunk wiring 13a are directly connected by the trunk wiring 13a formed in the contact hole 6h.
- the trunk wiring 13a and the branch wiring 13b are connected by the trunk wiring 13a in the connected region.
- connection conductor 14 by using the trunk wiring 13a as it is as the connection conductor 14, there is no need to add a separate step of forming the connection conductor 14.
- the above-described photomask for forming the amorphous silicon film 7 is used as a halftone mask whose exposure amount can be controlled, and a resist film having a different film thickness is provided on the amorphous silicon film 7, thereby manufacturing a five-mask.
- the signal wiring 13 for the gate drive circuit can be formed.
- the same layer as the pixel electrode 3 is not arranged in the region where the gate drive circuit signal wiring 13 is formed in the peripheral region of the TFT array substrate 1.
- the sealing spacer For example, secondary contact failure due to a rod-like glass fiber having a diameter of several microns can be suppressed.
- branch wiring 13b is a single-layer Al alloy film exemplified as the gate electrode layer 5
- the edge portion tends to have a sharp shape, and the wiring over the wiring having such a shape is disconnected. It's easy to do.
- FIG. 11 shows still another gate drive circuit signal wiring 13 provided on the TFT array substrate 1.
- the trunk lines 13a and 13a 'closer to the gate drive circuit 11 have a larger number of intersections with the branch lines 13b and the load becomes larger. Therefore, the trunk formed near the gate drive circuit 11 is increased. It is preferable that the lines 13a and 13a ′ have a narrower line width.
- the trunk wiring 13a 'arranged at the position farthest from the gate drive circuit 11 does not intersect the branch wiring 13b due to the arrangement. That is, even if the trunk wiring 13a 'is formed thick, the capacitance generated at the intersection of the trunk wiring 13a' and the branch wiring 13b does not increase. For this reason, it is desirable to dispose the wiring for which lower resistance is desired at the position farthest from the gate drive circuit 11.
- the gate-off potential is related to the TFT leakage current during the period during which the liquid crystal applied voltage is held in each pixel, and is related to display quality such as a decrease in contrast and display unevenness. To stabilize the signal. That is, it is desirable to dispose the main wiring for supplying the gate-off potential at the position farthest from the gate driving circuit 11.
- the second trunk wiring 15, the second branch wiring 15a, the third trunk wiring 16, and the third trunk wiring 16a are further provided as shown in FIG.
- the wiring 13b and / or the second branch wiring 15a (not shown in FIG. 11) and the trunk wiring 13a and / or the third trunk wiring 16 (not shown in FIG. 11) overlap in plan view.
- the wirings 13a, 13b, 15a, and 16 are preferably provided so that the line width is narrow so that the area is reduced.
- the line width of the trunk wiring 13a is narrowed at the intersection of the trunk wiring 13a and the branch wiring 13b.
- the trunk wiring 13a is constricted so that the overlapping area of the trunk wiring 13a and the branch wiring 13b is reduced in plan view at the intersection, so that the capacitance that can be generated at the intersection is suppressed. Can do.
- another wiring 19 may be formed between the gate drive circuit 11 and the five trunk wirings 13a ′, 13a, 13a, 13a, and 13a. .
- trunk wirings 13 a ′, 13 a, 13 a, 13 a, and 13 a may not be arranged immediately adjacent to the gate drive circuit 11.
- Other wiring 19 may be a display area wiring disconnection repair wiring, an inspection signal line, a counter (common) electrode wiring, an auxiliary capacitance wiring, or the like.
- a rectangular contact hole 13h is formed in the trunk wiring 13a.
- an odd-shaped contact hole 20 was formed in the main wiring 13a.
- the shape of the contact hole provided in the trunk wiring 13a or the gate insulating film 6 in order to expose the branch wiring 13b is not particularly limited.
- the liquid crystal display device which is an example of the active matrix display device of the present invention has a configuration including the TFT array substrate 1 described above.
- the liquid crystal display device includes, for example, a TFT array substrate 1 and a color filter substrate facing the TFT array substrate 1, and has a configuration in which a liquid crystal layer is sealed between the substrates by a sealing material. ing.
- the liquid crystal display device is used as an example of the active matrix display device.
- the present invention is not limited thereto, and the TFT array substrate 1 is replaced with another active matrix display device such as an organic EL display device.
- the present invention can also be applied.
- the TFT array substrate 1 described above can be applied not only to a display device but also to a reading device such as an X-ray sensor.
- the pixel electrode is formed in an upper layer than the trunk wiring and the branch wiring, and the trunk wiring is formed with a through hole so as to at least partially overlap the contact hole.
- the branch wiring and the trunk wiring are electrically connected via a connection conductor provided in the contact hole and the through hole, and the connection conductor is formed of the same layer material as the pixel electrode. It is preferable that
- the branch wiring and the trunk wiring are connected by the same layer as the pixel electrode.
- the branch wiring and the trunk wiring can be connected without adding a separate process.
- connection conductor is preferably a trunk wiring.
- the branch wiring and the trunk wiring are connected by the trunk wiring.
- the trunk wiring as it is for connection between the branch wiring and the trunk wiring, the branch wiring and the trunk wiring can be connected without adding a separate process.
- the pixel electrode material is not disposed in the peripheral region, which is a region where the branch wiring and the trunk wiring are connected, in the active matrix substrate.
- the active matrix substrate of the present invention it is preferable that a plurality of the trunk wirings are provided, and the line width of the trunk wiring farthest from the drive circuit is larger than the line widths of the other trunk wirings.
- the trunk wiring arranged at the position farthest from the driving circuit does not intersect the branch wiring on the arrangement. Therefore, even if the trunk wiring is formed thick, the capacitance generated at the intersection of the trunk wiring and the branch wiring does not increase.
- the line width of the trunk wiring is so narrow that it is formed near the driving circuit.
- the line width can be made narrower, and the capacitance that can occur at the intersection can be suppressed.
- a plurality of the trunk wirings are provided, and are provided in a straight line parallel to the same width and the same interval.
- the sealing material can be uniformly cured without unevenness.
- the trunk wiring is partially laminated with wiring formed by the same layer as the branch wiring and / or the same layer as the pixel electrode. Is preferably electrically connected.
- the trunk wiring since the trunk wiring has a partially laminated structure, the resistance of the trunk wiring can be further reduced.
- the wiring area can be reduced and the display device can be miniaturized.
- a second trunk wiring is provided at a position further away from the driving circuit than a trunk wiring arranged at a position farthest from the driving circuit, and the second wiring is provided. It is preferable that the second trunk wiring and the second branch wiring that electrically connects the second trunk wiring and the driving circuit are formed in the same layer as the branch wiring.
- the second trunk wiring does not intersect with the branch wiring because of its arrangement, and can be formed in the same layer as the branch wiring.
- the second trunk wiring and the second branch wiring that electrically connects the second trunk wiring and the drive circuit are both formed in the same layer as the branch wiring. Therefore, a contact hole for connecting the second trunk wiring and the second branch wiring becomes unnecessary, and the yield can be further improved.
- the second trunk wiring and the second branch wiring connecting the second trunk wiring and the driving circuit are formed by patterning the same layer as the branch wiring. Can be realized.
- the second trunk wiring is laminated with a wiring formed of the same layer as the trunk wiring and / or the same layer as the pixel electrode. And the wiring are preferably electrically connected.
- the resistance can be further reduced.
- the wiring area can be reduced and the display device can be miniaturized.
- the wirings are arranged so that the overlapping area is small in a plan view. It is preferable that the line width is reduced.
- a third trunk wiring is provided at a position closer to the drive circuit than the trunk wiring arranged at a position closest to the drive circuit.
- the third branch wiring that electrically connects the main wiring and the driving circuit is preferably formed in the same layer as the main wiring.
- the third branch wiring since the third branch wiring does not intersect with the trunk wiring in terms of arrangement, the third branch wiring can be formed in the same layer as the trunk wiring.
- the third trunk wiring and the third branch wiring are both formed in the same layer as the trunk wiring, a separate contact hole for connecting these wirings becomes unnecessary. Yield can be further improved.
- the third branch wiring is provided without providing a separate switching member on the source electrode or the drain electrode of the transistor. Can be connected.
- the terminal portions that are electrically connected to the trunk wiring and for inputting signals from the outside are formed of the same material.
- the terminal portions that are electrically connected to the trunk wiring and the second trunk wiring and for inputting signals from the outside are formed of the same material. Is preferred.
- the terminal portion is electrically connected to a third trunk wiring provided closer to the drive circuit than to the trunk wiring arranged closest to the drive circuit. It is preferable that both are made of the same material.
- conductive particles are used to connect the terminal part to an external circuit that inputs a signal to the terminal part.
- a difference in film thickness occurs, resulting in poor contact. There is a problem that is likely to occur.
- the terminal portion includes an upper electrode and a lower electrode, the lower electrode is formed in the same layer as the branch wiring, and the upper electrode is the same as the trunk wiring. It is preferable to form one layer or the same layer as the pixel electrode, and the lower electrode and the upper electrode are electrically connected.
- the upper electrode of the terminal portion is formed in the same layer as the main wiring or the same layer as the pixel electrode, and the lower electrode of the terminal portion is formed in the same layer as the branch wiring. Therefore, it is not necessary to add a separate process for forming the terminal portion.
- the terminal portion and the second terminal portion for inputting another signal from the outside are formed of the same material.
- the determination criteria are as follows when performing the above-described problem of poor contact or indentation inspection of conductive particles. There is no problem of complexity.
- the present invention can be applied to an active matrix display device typified by a liquid crystal display device and an organic EL display device.
- the display device In addition to the display device, it can be applied to a reading device such as an X-ray sensor.
- a reading device such as an X-ray sensor.
- TFT array substrate active matrix substrate
- Pixel TFT element Pixel electrode
- Insulating substrate 5
- Gate electrode layer multiple electrode layers
- Gate insulating film insulating layer
- Source / drain electrode layers multiple electrode layers
- Gate drive circuit 12 2nd terminal part 13a, 13a 'trunk wiring 13b branch wiring 13h contact hole, through-hole 13h' second contact hole 14 connection conductor 15 second trunk wiring 15a second branch wiring 16 third trunk wiring 16a Third branch wiring 17 wiring 18 terminal portion R1 display area R2 peripheral area
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Abstract
Description
以下、図1~7に基づき、本発明のアクティブマトリクス型表示装置の一例である液晶表示装置に備えられたアクティブマトリクス基板としてのTFTアレイ基板1の構成について説明する。
図5は、幹配線13aのパターニング形状の変形例を示す図である。
図6は、幹配線13aおよび枝配線13bのさらに他の変形例を示す図である。
図7は、幹配線13aのさらに他の変形例を示す図である。
次に、図8に基づいて、本発明の第2の実施形態について説明する。本実施の形態は、幹配線13aと第2の幹配線15と第3の幹配線16とにそれぞれ接続された端子部18が設けられている点において実施の形態1とは異なっており、その他の構成については実施の形態1において説明したとおりである。説明の便宜上、上記の実施の形態1の図面に示した部材と同じ機能を有する部材については、同じ符号を付し、その説明を省略する。
次に、図9および図10に基づいて、本発明の第3の実施形態について説明する。本実施の形態は、露出された枝配線13bと幹配線13aとが、直接接続されている点において実施の形態1とは異なっており、その他の構成については実施の形態1において説明したとおりである。説明の便宜上、上記の実施の形態1の図面に示した部材と同じ機能を有する部材については、同じ符号を付し、その説明を省略する。
次に、図11に基づいて、本発明の第4の実施形態について説明する。説明の便宜上、上記の実施の形態1~3の図面に示した部材と同じ機能を有する部材については、同じ符号を付し、その説明を省略する。
2 画素TFT素子(TFT素子)
3 画素電極
4 絶縁基板
5 ゲート電極層(複数の電極層)
6 ゲート絶縁膜(絶縁層)
8 ソース・ドレイン電極層(複数の電極層)
11 ゲート駆動回路(駆動回路)
12 第2の端子部
13a、13a’ 幹配線
13b 枝配線
13h コンタクトホール、貫通孔
13h’ 第2のコンタクトホール
14 接続導体
15 第2の幹配線
15a 第2の枝配線
16 第3の幹配線
16a 第3の枝配線
17 配線
18 端子部
R1 表示領域
R2 周辺領域
Claims (17)
- 絶縁基板と、
上記絶縁基板上に形成されたTFT素子と、
上記TFT素子に電気的に接続された画素電極がマトリクス状に設けられた表示領域と、
上記TFT素子を駆動するための駆動回路が設けられた周辺領域とを備えたアクティブマトリクス基板であって、
上記表示領域の周辺の領域が上記周辺領域であり、
上記周辺領域には、上記駆動回路に電気的に接続された枝配線が複数備えられており、
上記枝配線のうちのひとつに電気的に接続された幹配線とがさらに備えられており、
上記TFT素子には、複数の電極層が備えられており、
上記枝配線および上記幹配線は、上記電極層と同一層の電極層で形成されており、
上記枝配線は、上記TFT素子に備えられた複数の電極層における、上記幹配線を形成する上記電極層より下層の電極層により形成されており、
上記幹配線と上記枝配線との間には、絶縁層が設けられ、
上記幹配線と上記枝配線のうちの別のひとつとが、交差しており、
上記交差部における、上記幹配線の線幅は、上記枝配線の線幅より広く設けられているとともに、
上記幹配線と上記枝配線のうちのひとつとが、電気的に接続される領域においては、上記幹配線と上記枝配線とは平面視において重なっており、上記絶縁層には、上記枝配線のうちのひとつが露出されるようにコンタクトホールが形成されており、
上記枝配線のうちのひとつと上記幹配線とは、上記コンタクトホールに設けられた接続導体を介して電気的に接続されていることを特徴とするアクティブマトリクス基板。 - 上記画素電極は、上記幹配線および上記枝配線より上層に形成されており、
上記幹配線には、上記コンタクトホールと少なくとも一部が重なるように貫通孔が形成されており、
上記枝配線と上記幹配線とは、上記コンタクトホールおよび上記貫通孔に設けられた接続導体を介して電気的に接続され、
上記接続導体は、上記画素電極と同一層の材料によって形成されていることを特徴とする請求項1に記載のアクティブマトリクス基板。 - 上記接続導体が、幹配線であることを特徴とする請求項1に記載のアクティブマトリクス基板。
- 上記幹配線は、複数本設けられており、上記駆動回路から最も離れた位置の幹配線の線幅が、そのほかの幹配線の線幅よりも太いことを特徴とする請求項1から3の何れか1項に記載のアクティブマトリクス基板。
- 上記幹配線の線幅は、上記駆動回路の近くに形成される程、狭く設けられていることを特徴とする請求項1から4の何れか1項に記載のアクティブマトリクス基板。
- 上記幹配線は、複数本設けられており、同幅、同間隔に平行な直線状に設けられていることを特徴とする請求項1から3の何れか1項に記載のアクティブマトリクス基板。
- 上記幹配線には、上記枝配線と同一層および/または上記画素電極と同一層によって形成された配線が部分的に積層されており、
上記幹配線と当該配線とは、
電気的に接続されていることを特徴とする請求項1から6の何れか1項に記載のアクティブマトリクス基板。 - 上記駆動回路から最も離れた位置に配置された幹配線よりも、さらに上記駆動回路から離れた位置には、第2の幹配線が設けられており、
上記第2の幹配線と、上記第2の幹配線と上記駆動回路とを電気的に接続する第2の枝配線とは、上記枝配線と同一層で形成されていることを特徴とする請求項1から7の何れか1項に記載のアクティブマトリクス基板。 - 上記第2の幹配線には、上記幹配線と同一層および/または上記画素電極と同一層によって形成された配線が積層されており、
上記第2の幹配線と当該配線とは、電気的に接続されていることを特徴とする請求項8に記載のアクティブマトリクス基板。 - 上記枝配線および/または上記第2の枝配線と、上記幹配線との交差部においては、
平面視において重なり面積が小さくなるように、上記各配線は、その線幅が狭くなるように設けられていることを特徴とする請求項8または9に記載のアクティブマトリクス基板。 - 上記駆動回路から最も近い位置に配置された幹配線よりも、さらに、上記駆動回路から近い位置には、第3の幹配線が設けられており、
上記第3の幹配線と上記駆動回路とを電気的に接続する第3の枝配線とは、上記幹配線と同一層で形成されていることを特徴とする請求項1から10の何れか1項に記載のアクティブマトリクス基板。 - 上記幹配線に電気的に接続され、外部からの信号を入力するための端子部は、
何れも同一材料で形成されていることを特徴とする請求項1から7の何れか1項に記載のアクティブマトリクス基板。 - 上記幹配線と上記第2の幹配線とに電気的に接続され、外部からの信号を入力するための端子部は、
何れも同一材料で形成されていることを特徴とする請求項8から10の何れか1項に記載のアクティブマトリクス基板。 - 上記端子部は、上記駆動回路から最も近い位置に配置された幹配線よりも、さらに、上記駆動回路から近い位置に設けられた第3の幹配線に電気的に接続され、
何れも同一材料で形成されていることを特徴とする請求項13に記載のアクティブマトリクス基板。 - 上記端子部は、上部電極と下部電極とを備えており、
上記下部電極は、上記枝配線と同一層で形成され、
上記上部電極は、上記幹配線と同一層または、上記画素電極と同一層で形成され、
上記下部電極と上記上部電極とは、電気的に接続されていることを特徴とする請求項12から14の何れか1項に記載のアクティブマトリクス基板。 - 上記端子部と、外部からさらに他の信号を入力するための第2の端子部とは、同一材料で形成されていることを特徴とする請求項12から15の何れか1項に記載のアクティブマトリクス基板。
- 請求項1から16の何れか1項に記載のアクティブマトリクス基板を備えたことを特徴とするアクティブマトリクス型表示装置。
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CN104600200B (zh) * | 2014-12-26 | 2017-07-28 | 上海天马微电子有限公司 | 一种阵列基板及显示面板 |
CN104699348A (zh) * | 2015-04-01 | 2015-06-10 | 上海天马微电子有限公司 | 一种阵列基板和显示装置 |
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JP2019184864A (ja) * | 2018-04-12 | 2019-10-24 | シャープ株式会社 | 表示装置 |
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