WO2005018006A1 - アレイ基板、液晶表示装置およびアレイ基板の製造方法 - Google Patents
アレイ基板、液晶表示装置およびアレイ基板の製造方法 Download PDFInfo
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- WO2005018006A1 WO2005018006A1 PCT/JP2004/011610 JP2004011610W WO2005018006A1 WO 2005018006 A1 WO2005018006 A1 WO 2005018006A1 JP 2004011610 W JP2004011610 W JP 2004011610W WO 2005018006 A1 WO2005018006 A1 WO 2005018006A1
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- Prior art keywords
- insulating film
- conductive layer
- gate
- polycrystalline semiconductor
- array substrate
- Prior art date
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- 239000004973 liquid crystal related substance Substances 0.000 title claims description 53
- 238000004519 manufacturing process Methods 0.000 title claims description 11
- 239000000758 substrate Substances 0.000 claims abstract description 70
- 238000000059 patterning Methods 0.000 claims abstract description 5
- 239000010410 layer Substances 0.000 claims description 161
- 239000011229 interlayer Substances 0.000 claims description 55
- 239000004065 semiconductor Substances 0.000 claims description 40
- 239000003990 capacitor Substances 0.000 claims description 38
- 238000000034 method Methods 0.000 claims description 20
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 15
- 239000010936 titanium Substances 0.000 claims description 13
- 229910052782 aluminium Inorganic materials 0.000 claims description 11
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 claims description 8
- 229910052750 molybdenum Inorganic materials 0.000 claims description 8
- 239000011733 molybdenum Substances 0.000 claims description 8
- MGRWKWACZDFZJT-UHFFFAOYSA-N molybdenum tungsten Chemical compound [Mo].[W] MGRWKWACZDFZJT-UHFFFAOYSA-N 0.000 claims description 8
- 239000002019 doping agent Substances 0.000 claims description 7
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims description 6
- 229910045601 alloy Inorganic materials 0.000 claims description 6
- 239000000956 alloy Substances 0.000 claims description 6
- WPPDFTBPZNZZRP-UHFFFAOYSA-N aluminum copper Chemical compound [Al].[Cu] WPPDFTBPZNZZRP-UHFFFAOYSA-N 0.000 claims description 6
- 229910052719 titanium Inorganic materials 0.000 claims description 6
- JZLMRQMUNCKZTP-UHFFFAOYSA-N molybdenum tantalum Chemical compound [Mo].[Ta] JZLMRQMUNCKZTP-UHFFFAOYSA-N 0.000 claims description 5
- NRTOMJZYCJJWKI-UHFFFAOYSA-N Titanium nitride Chemical compound [Ti]#N NRTOMJZYCJJWKI-UHFFFAOYSA-N 0.000 claims description 4
- 239000010408 film Substances 0.000 abstract description 161
- 239000010409 thin film Substances 0.000 abstract description 86
- 229910052751 metal Inorganic materials 0.000 abstract description 48
- 239000002184 metal Substances 0.000 abstract description 48
- 229910021420 polycrystalline silicon Inorganic materials 0.000 abstract description 28
- 229920005591 polysilicon Polymers 0.000 abstract description 28
- 239000011521 glass Substances 0.000 abstract description 12
- 238000000206 photolithography Methods 0.000 description 18
- 230000001681 protective effect Effects 0.000 description 14
- 238000005530 etching Methods 0.000 description 12
- UBSJOWMHLJZVDJ-UHFFFAOYSA-N aluminum neodymium Chemical compound [Al].[Nd] UBSJOWMHLJZVDJ-UHFFFAOYSA-N 0.000 description 9
- 238000000605 extraction Methods 0.000 description 8
- 238000003475 lamination Methods 0.000 description 7
- 239000000463 material Substances 0.000 description 7
- XYFCBTPGUUZFHI-UHFFFAOYSA-N Phosphine Chemical compound P XYFCBTPGUUZFHI-UHFFFAOYSA-N 0.000 description 6
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 6
- 229910021417 amorphous silicon Inorganic materials 0.000 description 6
- 229910052814 silicon oxide Inorganic materials 0.000 description 6
- 238000000137 annealing Methods 0.000 description 5
- 230000000149 penetrating effect Effects 0.000 description 5
- VSCWAEJMTAWNJL-UHFFFAOYSA-K aluminium trichloride Chemical compound Cl[Al](Cl)Cl VSCWAEJMTAWNJL-UHFFFAOYSA-K 0.000 description 4
- 239000007789 gas Substances 0.000 description 4
- 238000005224 laser annealing Methods 0.000 description 4
- 238000007725 thermal activation Methods 0.000 description 4
- 229910000838 Al alloy Inorganic materials 0.000 description 3
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 description 3
- 229910001182 Mo alloy Inorganic materials 0.000 description 3
- MUBZPKHOEPUJKR-UHFFFAOYSA-N Oxalic acid Chemical compound OC(=O)C(O)=O MUBZPKHOEPUJKR-UHFFFAOYSA-N 0.000 description 3
- 229910052581 Si3N4 Inorganic materials 0.000 description 3
- 229910052796 boron Inorganic materials 0.000 description 3
- 238000001312 dry etching Methods 0.000 description 3
- 238000001020 plasma etching Methods 0.000 description 3
- HQVNEWCFYHHQES-UHFFFAOYSA-N silicon nitride Chemical compound N12[Si]34N5[Si]62N3[Si]51N64 HQVNEWCFYHHQES-UHFFFAOYSA-N 0.000 description 3
- PXGOKWXKJXAPGV-UHFFFAOYSA-N Fluorine Chemical compound FF PXGOKWXKJXAPGV-UHFFFAOYSA-N 0.000 description 2
- 230000001133 acceleration Effects 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 238000005229 chemical vapour deposition Methods 0.000 description 2
- 229910052731 fluorine Inorganic materials 0.000 description 2
- 239000011737 fluorine Substances 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 239000011159 matrix material Substances 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 229910000073 phosphorus hydride Inorganic materials 0.000 description 2
- 238000004544 sputter deposition Methods 0.000 description 2
- 238000003860 storage Methods 0.000 description 2
- TXEYQDLBPFQVAA-UHFFFAOYSA-N tetrafluoromethane Chemical compound FC(F)(F)F TXEYQDLBPFQVAA-UHFFFAOYSA-N 0.000 description 2
- 238000001039 wet etching Methods 0.000 description 2
- KZBUYRJDOAKODT-UHFFFAOYSA-N Chlorine Chemical compound ClCl KZBUYRJDOAKODT-UHFFFAOYSA-N 0.000 description 1
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 description 1
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 description 1
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
- 229910001080 W alloy Inorganic materials 0.000 description 1
- JRBRVDCKNXZZGH-UHFFFAOYSA-N alumane;copper Chemical group [AlH3].[Cu] JRBRVDCKNXZZGH-UHFFFAOYSA-N 0.000 description 1
- 125000003178 carboxy group Chemical group [H]OC(*)=O 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 239000000460 chlorine Substances 0.000 description 1
- 229910052801 chlorine Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 229910001882 dioxygen Inorganic materials 0.000 description 1
- 239000003779 heat-resistant material Substances 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 230000006386 memory function Effects 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 235000006408 oxalic acid Nutrition 0.000 description 1
- 229910052698 phosphorus Inorganic materials 0.000 description 1
- 239000011574 phosphorus Substances 0.000 description 1
- 239000002356 single layer Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Classifications
-
- 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
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L29/00—Semiconductor devices specially adapted for rectifying, amplifying, oscillating or switching and having potential barriers; Capacitors or resistors having potential barriers, e.g. a PN-junction depletion layer or carrier concentration layer; Details of semiconductor bodies or of electrodes thereof ; Multistep manufacturing processes therefor
- H01L29/66—Types of semiconductor device ; Multistep manufacturing processes therefor
- H01L29/68—Types of semiconductor device ; Multistep manufacturing processes therefor controllable by only the electric current supplied, or only the electric potential applied, to an electrode which does not carry the current to be rectified, amplified or switched
- H01L29/76—Unipolar devices, e.g. field effect transistors
- H01L29/772—Field effect transistors
- H01L29/78—Field effect transistors with field effect produced by an insulated gate
- H01L29/786—Thin film transistors, i.e. transistors with a channel being at least partly a thin film
- H01L29/78651—Silicon transistors
- H01L29/7866—Non-monocrystalline silicon transistors
- H01L29/78672—Polycrystalline or microcrystalline silicon transistor
- H01L29/78675—Polycrystalline or microcrystalline silicon transistor with normal-type structure, e.g. with top gate
Definitions
- the present invention relates to an array substrate provided with a switching element, a liquid crystal display device, and a method for manufacturing an array substrate.
- a liquid crystal display device is not only a simple drive circuit such as an X driver circuit and a Y driver circuit, but a DAC (Digital-to-Analog Converter) circuit which has been mounted with TAB (Tape Automated Bonding) until now.
- System liquid crystals are being commercialized, in which external circuits such as are built on one main surface of a glass substrate as a translucent substrate, and memory functions such as SRAM or DRAM, and optical sensors are built-in.
- This type of liquid crystal display device requires a thin film transistor as a high-performance switching element, and is required to have low power consumption and a high aperture ratio.
- it is necessary to reduce the thickness of the gate wiring and signal wiring as the first metal layer, resulting in lower power consumption (H common inversion drive) and DA converter.
- H common inversion drive H common inversion drive
- DA converter DA converter
- the term “thinning” refers to thinning the conventional wiring width of 3 ⁇ m or more and 5 ⁇ m or less to 0.5 ⁇ m or more and 2 ⁇ m or less.
- an impurity such as phosphorus (P) or boron (B) is implanted into the polycrystalline semiconductor to reduce the flat band voltage of the MOS capacitor.
- P phosphorus
- B boron
- a specific method for manufacturing an array substrate for a liquid crystal display device is to form an amorphous semiconductor layer on a glass substrate and then perform laser beam annealing on the amorphous semiconductor layer to form a polycrystalline semiconductor layer. Putter jung after layer. Then, the glass containing the polycrystalline semiconductor layer A gate insulating film is formed over a substrate.
- the film thickness of the gate insulating film is as thin as possible. For this reason, a structure in which a gate insulating film is formed over the polycrystalline semiconductor layer and a gate electrode layer is formed over the gate insulating film. Therefore, before forming this gate electrode, the resist is patterned and an n-type dopant (PH3) is injected by doping to form an n + region of the n-ch thin film transistor (TFT), a pixel capacitor, and a circuit.
- PH3 n-type dopant
- a gate electrode for a p-ch thin film transistor is patterned.
- a p-type dopant B2H5 is implanted as an impurity to form a p + region of the p_ch thin film transistor.
- an alloy containing molybdenum (Mo) such as molybdenum-tungsten (MoW) -molybdenum-tantalum (MoTa) is used as a gate wiring.
- the gate electrode of this liquid crystal display device also has a single layer of a gate line lead line, a pixel capacitor line, and a circuit capacitor line.
- Molybdenum alloy has heat resistance, and is thermally activated at about 500 ° C or more and 600 ° C or less. It has been used for the gate electrode as a material that can be sufficiently eliminated from thermal annealing. However, since the sheet resistance of a molybdenum alloy with a thickness of 30 Onm is as high as 0.5 ⁇ / cm 2 , the resistance increases as the line becomes thinner, so the gate electrode cannot be made finer.
- a material having a lower resistance than a molybdenum alloy for example, an aluminum alloy such as versatile aluminum (A1) or aluminum (! Cu) may be used.
- an aluminum alloy such as versatile aluminum (A1) or aluminum (! Cu)
- the wiring is likely to be short-circuited due to the high temperature of the thermal activation in the subsequent process, and the reliability will be degraded due to resistance degradation or disconnection due to electrification at the electrification opening. If the aluminum or aluminum alloy is annealed at high temperature during thermal activation, hillocks may occur and the wiring may be short-circuited. Is difficult from a process point of view.
- AlNd aluminum-neodymium
- the gate electrode of the liquid crystal display device is made of aluminum-neodymium and the gate electrode is dry-etched, the inner wall surface of the chamber of the dry-etching device is coated with aluminum chloride (A1C12). )), It is not easy to improve productivity because a large amount of etching products adhere. For this reason, it is difficult to use aluminum-neodymium as the gate electrode in a product that requires the gate electrode to be thinner from the viewpoint of the addition. Therefore, it is not easy to make the gate electrode thinner and lower in resistance.
- the present invention has been made in view of the above points, and provides an array substrate, a liquid crystal display device, and a method of manufacturing an array substrate that can make the first conductive layer thinner and lower in resistance. Aim.
- the array substrate according to an aspect of the present invention includes:
- a plurality of polycrystalline semiconductor layers provided on one main surface of the light-transmitting substrate;
- a gate insulating film provided on one main surface of the translucent substrate including the plurality of polycrystalline semiconductor layers;
- a first conductive layer provided to face any one of the plurality of polycrystalline semiconductor layers via the gate insulating film
- a wiring portion provided on one main surface of the first conductive layer and electrically connected to the first conductive layer; and A second conductive layer provided with an insulating film and having a capacitance wiring portion for forming a capacitance between the second conductive layer and the polycrystalline semiconductor layer;
- a liquid crystal display device includes:
- a counter substrate provided to face the array substrate
- a method for manufacturing an array substrate according to another aspect of the present invention includes:
- a first conductive layer is provided on one main surface of the gate insulating film, Patterning the first conductive layer to form a pair of gate electrodes facing one of the plurality of polycrystalline semiconductor layers;
- the polycrystalline semiconductor layer opposite to the gate electrode is doped to form a source region and a drain region of the p-type switching element
- doping is performed on each of the polycrystalline semiconductor layer facing the gate electrode and the polycrystalline semiconductor layer not facing the gate electrode.
- a second conductive layer is formed on one main surface of the gate insulating film including the pair of gate electrodes, and the second conductive layer is patterned to form a pair of wiring portions facing the pair of gate electrodes. And forming an auxiliary capacitance portion of the auxiliary capacitance facing the polycrystalline semiconductor layer where the pair of gate electrodes are not provided facing each other.
- FIG. 1 is an explanatory sectional view showing a liquid crystal display device according to a first embodiment of the present invention.
- FIG. 2 is an explanatory cross-sectional view showing a state where a first conductive layer is formed on a translucent substrate of the liquid crystal display device.
- FIG. 3 is an explanatory cross-sectional view showing a state where a portion serving as a source region and a drain region of a p-channel thin film transistor of the liquid crystal display device is doped.
- FIG. 4 is an explanatory cross-sectional view showing a state in which a portion serving as a source region and a drain region of an n-channel thin film transistor of the liquid crystal display device and a portion serving as a capacitance portion of an auxiliary capacitor are doped.
- FIG. 5 is an explanatory sectional view showing a state in which a second metal layer is formed on a gate insulating film including a gate electrode of the liquid crystal display device.
- FIG. 6 is an explanatory sectional view showing a state where a second conductive layer of the liquid crystal display device is patterned.
- FIG. 7 An interlayer is formed on the gate insulating film including the wiring portion and the capacitor wiring portion of the liquid crystal display device. It is explanatory sectional drawing which shows the state in which the insulating film was provided.
- FIG. 8 is an explanatory sectional view showing a state in which holes outside contours are formed in an interlayer insulating film of the liquid crystal display device.
- FIG. 9 is an explanatory cross-sectional view showing a state where a conductive layer formed on an interlayer insulating film including a contact hole of the liquid crystal display device is patterned.
- FIG. 10 is an explanatory cross-sectional view showing a state in which a protective film is formed on an interlayer insulating film including a source electrode, a drain electrode, and a lead electrode of the liquid crystal display device.
- FIG. 11 is an explanatory sectional view showing a liquid crystal display device according to a second embodiment of the present invention.
- FIG. 12 is an explanatory sectional view showing a state in which a first interlayer insulating film is formed on a gate insulating film including a gate electrode of the liquid crystal display device.
- FIG. 13 is an explanatory cross-sectional view showing a state where a contact hole is formed in a first interlayer insulating film of the liquid crystal display device.
- FIG. 14 is an explanatory cross-sectional view showing a state where a second metal layer is formed on a first interlayer insulating film including a contact hole of the liquid crystal display device.
- FIG. 15 is an explanatory sectional view showing a state where a second metal layer of the liquid crystal display device is patterned.
- FIG. 16 is an explanatory cross-sectional view showing a state where a second interlayer insulating film is provided on a gate insulating film including a wiring portion and a capacitor wiring portion of the liquid crystal display device.
- FIG. 17 is an explanatory sectional view showing a state where a contact hole is formed in a second interlayer insulating film of the liquid crystal display device.
- FIG. 18 is an explanatory cross-sectional view showing a state where a conductive layer formed on a second interlayer insulating film including a contact hole of the liquid crystal display device is patterned.
- FIG. 19 is an explanatory cross-sectional view showing a state where a protective film is formed on a second interlayer insulating film including a source electrode, a drain electrode, and a lead electrode of the liquid crystal display device.
- a liquid crystal display device 1 as a flat display device has a thin film transistor.
- This is a star-type liquid crystal display device and includes an array substrate 2 having a substantially rectangular flat plate shape.
- the array substrate 2 includes a glass substrate 3 which is a light-transmitting substrate as a substantially transparent rectangular plate-shaped insulating substrate.
- An undercoat layer (not shown) made of a silicon nitride film, a silicon oxide film, or the like is laminated and formed on a surface that is one main surface of the glass substrate 3.
- n-channel (n-ch) thin film transistors (TFTs) 4 as n-type switching elements for liquid crystal display are formed in a matrix.
- TFTs thin film transistors
- p-ch p-channel thin film transistors 5 as p-type switching elements for liquid crystal display
- pixel auxiliary capacitors 6 as auxiliary capacitors are provided in a matrix. It is formed in a plurality.
- each of the thin film transistors 4 and 5 is provided as one pixel component. Further, each of the thin film transistors 4 and 5 includes a polysilicon layer 11 as a polycrystalline semiconductor layer formed on the undercoat layer.
- the polysilicon layer 11 is made of polysilicon formed by laser annealing amorphous silicon as an amorphous semiconductor.
- the polysilicon layer 11 has a channel region 12 as an active layer provided at the center of the polysilicon layer 11. On both sides of the channel region 12, a source region 13 and a drain region 14, which are n + regions or P + regions, are provided to face each other.
- a gate insulating film 15 which is a silicon oxide film having an insulating property, is laminated and formed. Further, on the gate insulating film 15 facing the channel region 12, a gate electrode 16 composed of a first metal layer 72 as a first conductive layer is formed by lamination.
- the first metal layer 72 is made of an alloy containing molybdenum (Mo), that is, molybdenum-tungsten (MoW).
- Mo molybdenum
- these gate electrodes 16 are opposed to the channel regions 12 of the respective thin film transistors 4 and 5 via the gate insulating film 15, and have a width substantially equal to the width of the channel regions 12. I'll do it.
- a wiring portion 17 as a gate wiring made of a second metal layer 73 as a second conductive layer is formed by lamination.
- Each is a wiring between gate electrodes which is electrically connected to each gate electrode 16 and has a width dimension equal to the width dimension of each gate electrode 16.
- these wiring portions 17 are made of a material having a smaller resistance value than the gate electrode 16.
- a pixel storage capacitor 6 made of polysilicon is formed by lamination.
- the pixel auxiliary capacitance 6 is provided adjacent to the p-channel thin film transistor 5, and is provided on the opposite side of the n-channel thin film transistor 4 via the thin film transistor 5.
- the pixel auxiliary capacitance 6 is arranged on the same plane as the thin film transistors 4 and 5 on the glass substrate 3.
- the pixel auxiliary capacitance 6 includes a capacitance portion 22 made of polysilicon.
- the capacitance portion 22 is made of polysilicon formed by laser annealing of amorphous silicon as an amorphous semiconductor. Further, the capacitance section 22 is formed in the same step as the polysilicon layer 11 of each of the thin film transistors 4 and 5, and is laminated on the undercoat layer.
- the gate insulating film 15 is laminated and formed. Then, on the gate insulating film 15 facing the capacitance portion 22, a capacitance wiring portion 23 composed of the second metal layer 73 of the same layer as the wiring portion 17 of each thin film transistor 4, 5 is laminated. It is formed.
- the capacitance wiring portion 23 is provided on one side in the width direction of the capacitance portion 22 on the p-channel type thin film transistor 5 side. In other words, the capacitance wiring portion 23 is provided at a position closer to the p-channel thin film transistor 5 side than the center in the width direction of the capacitance portion 22.
- Each of the capacitance wiring portions 23 forms a capacitance with the capacitance portion 22 via the gate insulating film 15 between the capacitance wiring portion 23 and the capacitance portion 22.
- these capacitance wiring portions 23 are formed in the same step and in the same material as the wiring portions 17 of the respective thin film transistors 4 and 5. Therefore, the capacitance wiring portion 23 has a resistance value smaller than or smaller than the resistance value of the wiring portion 17 of each of the thin film transistors 4 and 5.
- An interlayer insulating film 31 which is an insulating silicon oxide film, is laminated on the gate insulating film 15 including the capacitor wiring portion 23 and the wiring portions 17 of the thin film transistors 4 and 5. The film is formed.
- the interlayer insulating film 31 and the gate insulating film 15 have A plurality of contact horns 32, 33, 34, 35, and 36 as conductive portions penetrating through the interlayer insulating film 31 and the gate insulating film 15 are provided with S openings.
- each of the contact holes 32 and 33 is provided on the source region 13 and the drain region 14 of the thin-film transistor 4 on both sides of the gate electrode 16 of the n-channel thin-film transistor 4.
- the contact hole 32 communicates with the source region 13 of the n-channel thin film transistor 4 and opens.
- the contact hole 33 communicates with the drain region 14 of the n-channel thin film transistor 4 and opens. Let's do it.
- Each of the contact holes 34 and 35 is provided on the source region 13 and the drain region 14 of the p-channel thin film transistor 5 on both sides of the gate electrode 16 thereof.
- the contact hole 34 is open to communicate with the source region 13 of the p-channel thin film transistor 5, and the contact hole 35 is open to communicate with the drain region 14 of the p-channel thin film transistor 5. I have.
- the contact horn hole 36 is open to communicate with the capacitance portion 22 of the pixel auxiliary capacitance 6.
- a source electrode 41 as a signal line as a conductive layer is provided in a stacked manner.
- the source electrode 41 is electrically connected to the source region 13 of the n-channel type thin film transistor 4 via the contact hole 32 to be conductive.
- a drain electrode 42 as a signal line as a conductive layer is provided in a stacked manner.
- the drain electrode 42 is electrically connected to the drain region 14 of the n-channel type thin film transistor 4 via the contact hole 33 to conduct.
- a source electrode 43 as a signal line as a conductive layer is provided in a stacked manner.
- the source electrode 43 is electrically connected to the source region 13 of the p-channel type thin film transistor 5 through the contact hole 34 to be conductive.
- a drain electrode 44 as a signal line as a conductive layer is provided in a stacked manner.
- the drain electrode 44 is electrically connected to the drain region 14 of the p-channel type thin film transistor 5 through the contact hole 33. The connection is continued.
- an extraction electrode 45 as a gate extraction wiring, which is a conductive layer is provided in a stacked manner.
- a protective film 51 is formed to cover each of the pixel auxiliary capacitance 6 and the pixel auxiliary capacitance 6.
- the protective film 51 is provided with a contact hole 52 as a conductive portion penetrating the protective film 51.
- the contact hole 52 is open to communicate with the extraction electrode 45 of the pixel auxiliary capacitance 6.
- a pixel electrode 53 is formed by lamination.
- the pixel electrode 53 is electrically connected to the lead-out electrode 45 via the contact hole 52 to conduct. That is, the pixel electrode 53 is electrically connected to the capacitor section 22 of the pixel auxiliary capacitor 6 via the extraction electrode 45.
- the pixel electrode 53 is controlled by one of the thin film transistors 4 and 5.
- an alignment film 54 is formed by lamination.
- a rectangular flat plate-shaped counter substrate 61 is provided so as to face the array substrate 2.
- the counter substrate 61 includes a glass substrate 62 which is a light-transmitting substrate as a substantially transparent rectangular flat insulating substrate.
- a counter electrode 63 is provided on one main surface of the glass substrate 62 facing the array substrate 2.
- an alignment film 64 is formed by lamination.
- a liquid crystal 65 is sandwiched between the alignment film 64 of the counter substrate 61 and the alignment film 54 of the array substrate 2.
- an amorphous silicon film as amorphous silicon which is an amorphous semiconductor having a film thickness of 50 nm, is formed on a glass substrate 3 by a CVD (Chemical Vapor D mark osition) method.
- the amorphous silicon film on the glass substrate 3 is irradiated with an excimer laser beam (laser annealing) to be crystallized, so that the amorphous silicon film becomes a polysilicon film 71 as a polycrystalline semiconductor layer.
- the thickness of the polysilicon film 71 be in the range of 40 nm or more and 80 nm or less.
- diborane (B2H5) is implanted into the polysilicon film 71 by doping, and is formed into an island shape by a photolithography process.
- the threshold voltage of each of the thin film transistors 4 and 5 can be controlled.
- the gate insulating film 15 having a thickness of SlOOnm is formed on the glass substrate 3 including the island-shaped polysilicon films 71 by PE (Plasma Enhanced) _CVD.
- a 300 nm-thick molybdenum-tungsten alloy (MoW) is formed on the gate insulating film 15 so as to become the gate electrode 16 of each of the thin film transistors 4 and 5.
- a first metal layer 72 as one conductive layer is formed. At this time, the sheet resistance of the first metal layer 72 was 0.5 ⁇ / cm 2 .
- the first metal layer 72 can be formed by forming a film of molybdenum-tantalum (MoTa) in addition to molybdenum tungsten (MoW).
- the first metal layer 72 is formed by removing a portion of the resist (not shown) except for portions that become the source region 13 and the drain region 14 on both sides of the gate electrode 16 of the p-channel thin film transistor 5. Then, both sides of the polysilicon layer 11 of the thin film transistor 5 are plasma-etched with a mixed gas containing fluorine and oxygen. At this time, the wiring width of the p-channel type gate electrode 16 is not less than 1 ⁇ ⁇ ⁇ and not more than 2 ⁇ ⁇ .
- the resist on the gate insulating film 15 is peeled off with an organic alkaline liquid.
- diborane ⁇ 2 ⁇ 5 as a ⁇ -type dopant is implanted by doping.
- the doping of diborane is for lowering the resistance value of the polysilicon layer 11 and for obtaining an ohmic contact with the metal.
- injection into the polysilicon layer 11 of the diborane a dose of 10 15 CM_ 2 at an acceleration voltage 50 keV.
- the first metal layer 72 to be the gate electrode 16 of the n-channel thin film transistor 4 and a portion of the first metal layer 72 to be the p-channel thin film transistor 5 are shown in FIG.
- the resist is patterned and the n-channel thin film transistor 4 is softened.
- Each of the portion serving as the source region 13 and the drain region 14 and the portion serving as the pixel auxiliary capacitor 6 are plasma-etched with a mixed gas containing fluorine and oxygen.
- the wiring width of the gate electrode 16 of the n-channel type thin film transistor 4 is also set to 1.0 ⁇ or more and 2.0 ⁇ m or less.
- the resist on the gate insulating film 15 is peeled off with an organic alkaline liquid.
- the portion of the first metal layer 72 that becomes the gate electrode 16 of the n-channel thin film transistor 4 and the portion that becomes the p-channel thin film transistor 5 Of the n-channel type thin film transistor 4 and the polysilicon layer 11 serving as the capacitor portion 22 of the pixel auxiliary capacitor 6 by phosphine (PH3 ) Is implanted by doping.
- the phosphine is injected into the polysilicon layer 11 at an acceleration voltage of 70 keV and a dose of 10 15 cm ⁇ 2 .
- the first metal layer of the portion to be the gate electrode 16 of the n-channel thin film transistor 4 is once again formed After etching 72 to reduce the width dimension, the n_ region may be formed by lightly doping n-type dopant.
- the length of the LDD region can be shortened, and the transistor characteristics (Ion characteristics) of the n-channel thin film transistor 4 can be improved.
- each of the source region 13 and the drain region 14 of the n-channel type thin film transistor 4 and the p-channel type thin film transistor 5 and the capacitance portion 22 of the pixel auxiliary capacitance 6 are set to 400 °.
- the source region 13, the drain region 14 and the capacitor 22 are activated by performing a thermal annealing process at a temperature of not less than C and not more than 500 ° C.
- the sheet resistance of each of the source region 13 and the drain region 14 which are the p + regions of the p-channel thin film transistor 5 is set to 3 k ⁇ / cm 2, and the source region 13 which is the n + region of the n-channel thin film transistor 4 is set.
- the sheet resistance of each of the drain region 14 and the drain region 14 was set to 2 k ⁇ / cm 2 .
- a wiring portion 17 connecting the gate electrodes 16 of the thin film transistors 4 and 5 and a pixel storage capacitor The second metal layer 73, which is the second conductive layer to be the capacitance wiring portion 23 of 6, is formed of a low-resistance material film, and the second metal layer 73 is formed directly on the gate insulating film 15. I do.
- the second metal layer 73 has a three-layer structure in which the thickness of each of titanium (Ti) Z aluminum-copper (A1Cu) / titanium (Ti) is 50 nm Z300 nm / 75 nm from the lower layer. A laminated film was used. Further, the sheet resistance of the second metal layer 73 was 0.12 QZcm 2 .
- the second metal layer 73 is connected to the wiring portion 17 and the capacitor wiring portion 23 connecting the gate electrodes 16 of the first metal layer 72 by photolithography. Pattern so that At this time, when the second metal layer 73 contains aluminum (A1) or aluminum-copper (AlCu), dry etching is performed using a metal chlorine-based gas. Further, when the second metal layer 73 contains aluminum-neodymium (AlNd), wet etching is performed.
- AlNd aluminum-neodymium
- a 600 nm-thick silicon oxide film is formed on the gate insulating film 15 including the wiring portion 17 and the capacitor wiring portion 23 by the PE-CVD method.
- An insulating film 31 is formed.
- the source region 13 and the drain region 14 of each of the thin film transistors 4 and 5 and the capacitance portion 22 of the pixel auxiliary capacitance 6 are connected to each other by a photolithography process.
- Each of the contact horns 32, 33, 34, 35, 36 through which they pass is formed.
- a laminated film of, for example, molybdenum (Mo) having a thickness of 50 nm and aluminum (A1) having a thickness of 500 nm is formed on the 31 by a sputtering method.
- the conductive layer 74 is etched by photolithography to form source electrodes 41 and 43, drain electrodes 42 and 44, and a lead electrode 45. At this time, when the conductive layer 74 is formed of a metal such as aluminum (Al) or aluminum-copper (AlCu), it is etched by chlorine gas and patterned.
- Al aluminum
- AlCu aluminum-copper
- the entire surface of the interlayer insulating film 31 including the source electrode 41, 43, the drain electrode 42, 44, and the extraction electrode 45 is formed to a thickness of 500 ⁇ by PE-CVD.
- a protective film 51 is formed by forming a silicon nitride film having a thickness of m.
- the protective film 51 is etched to form a contact hole 52 in the protective film 51 which is electrically connected to the extraction electrode 45 of the pixel auxiliary capacitor 6.
- tetrafluoromethane (CF4) gas and oxygen gas were used for this etching.
- a transparent conductive film is formed by sputtering on the protective film 51 including the contact hole 52 to form a pixel electrode 53, and then a photolithography step and an etching step are performed. 53 is puttered into a pixel shape. At this time, oxalic acid (HOOC—COOH) is used for etching the pixel electrode 53.
- HOOC—COOH oxalic acid
- the gate electrode of each of the n-channel thin film transistor and the p-channel thin film transistor is formed in two layers to connect the wiring portion which is a low-resistance metal, the second metal
- the photolithography step, and the etching step for forming the layer are added for the step of forming the capacitor part. As the number increases, productivity deteriorates.
- n is added to the polysilicon layer serving as the capacitance portion before forming this gate electrode.
- Phosphine (PH3) had to be implanted as doping dopant
- the pixel auxiliary capacitance 6 is formed by a capacitance portion 22 made of polysilicon, the gate insulating film 15, and the second metal that is a low-resistance wiring.
- the n + doping necessary for forming the capacitance part 22 of the pixel auxiliary capacitance 6 is formed as the capacitance wiring part 23 composed of the layer 73 by forming the source region 13 and the drain region 14 of the n-channel type thin film transistor 4.
- the same process is performed.
- the gate electrode 16 can be made thinner and lower in resistance while minimizing the number of steps, so that the liquid crystal display device 1 can have higher definition, higher aperture ratio and lower power consumption, and at the same time, have a memory circuit and A liquid crystal display device 1 having a built-in drive circuit up to TAB mounting can be formed.
- each of the n-channel thin film transistor 4 and the p-channel thin film transistor 5 has a two-layer structure of the gate electrode 16 and the wiring portion 17.
- a heat-resistant material is used for the gate electrode 16 that must be formed before thermal activation, and a low-resistance material is used for the long wiring length of the capacitance wiring portion 23 of the pixel auxiliary capacitor 6.
- the second metal layer 73 is formed after thermal activation by using. Therefore, the wiring resistance of the gate electrode 16 of each of the thin film transistors 4 and 5 can be miniaturized and reduced.
- the gate electrodes 16 of the thin film transistors 4 and 5 into two layers and changing the structure of the pixel auxiliary capacitance 6, the increase in the number of steps of the array substrate 2 can be minimized. The resistance of the gate electrodes 16 of these thin film transistors 4 and 5 can be reduced.
- the liquid crystal display device 1 shown in FIGS. 11 to 19 is basically the same as the liquid crystal display device 1 shown in FIGS. 1 to 10, except that a gate insulating film 15 including a gate electrode 16 is After forming the first interlayer insulating film 81, contact holes 82 and 83 are formed in the first interlayer insulating film 81 as conduction portions communicating with the gate electrodes 16, and these contact holes 82, 83 are formed. A second metal layer 73 is formed on a first interlayer insulating film 81 including 83.
- the interlayer insulating film 31 is formed by dividing the interlayer insulating film 31 into two layers, that is, a first interlayer insulating film 81 and a second interlayer insulating film 84.
- a second metal layer 73 is formed between an insulating film 81 and a second inter-layer insulating film 84. That is, in the liquid crystal display device 1, after forming the first metal layer 72, the second metal layer 73 is formed via the first interlayer insulating film 81.
- the first interlayer insulating film 81 is formed by being laminated on the gate insulating film 15 including each gate electrode 16.
- the first interlayer insulating film 81 on each of the gate electrodes 16 has Contact holes 82 and 83 penetrating the first interlayer insulating film 81 in a direction perpendicular to the plane direction are provided. These contact holes 82 and 83 have a width dimension equal to the width dimension of each gate electrode 16.
- the wiring portions 17 are formed in the contact holes 82 and 83. Each of these wiring portions 17 is electrically connected to each gate electrode 16.
- a second interlayer insulating film 84 is formed by lamination.
- the second interlayer insulating film 84, the first interlayer insulating film 81, and the gate insulating film 15 are respectively formed on the second interlayer insulating film 84, the first interlayer insulating film 81, and the gate insulating film 15.
- the steps up to the formation of the gate electrode 16 on the gate insulating film 15 are the same as the steps shown in FIGS. 2 to 4 of the first embodiment.
- a 50-nm-thick silicon oxide film is formed on the gate insulating film 15 including each gate electrode 16 by PE-CVD to form a first interlayer insulating film 81.
- the film thickness of the first interlayer insulating film 81 is determined so that the capacitance of the pixel auxiliary capacitance 6 is larger than that of the product.
- contact holes 82 and 83 for bonding to the respective gate electrodes 16 are formed in the first interlayer insulating film 81 by a photolithography process.
- the first interlayer insulating film including these contact holes 82 and 83 is formed.
- a 600 nm-thick silicon oxide film is formed on the first interlayer insulating film 81 including the wiring portions 17 and the capacitor wiring portions 23 to form a second interlayer insulating film.
- a film 84 is formed.
- a plurality of contact holes 32 penetrating through the second interlayer insulating film 84, the first interlayer insulating film 81, and the gate insulating film 15 are formed by photolithography.
- a conductive layer 74 serving as a signal line wiring is formed on a second interlayer insulating film 84 including each of the contact horns 32, 33, 34, 35, and 36. After that, the conductive layer 74 is etched by a photolithography process, and the source electrode 41, 43, the drain electrode 42,
- a silicon nitride film is formed on the entire surface of the interlayer insulating film 31 including the source electrodes 41 and 43, the drain electrodes 42 and 44, and the extraction electrode 45 by the PE-CVD method. Then, a protective film 51 is formed.
- this protective film 51 is etched by photolithography to form a contact hole.
- the pixel electrode 53 is formed on the protective film 51 including the contact hole 52.
- the interlayer insulating film 31 has a two-layer structure of the first interlayer insulating film 81 and the second interlayer insulating film 84
- the first embodiment The number of steps for forming the contact holes 82 and 83 is increased as compared with the embodiment.
- the gate electrode 16 of the first metal layer 72 is protected by the first interlayer insulating film 81 when etching the second metal layer 73, it is not necessary to use high selectivity etching. Thus, the etching of the second metal layer 73 is facilitated.
- the gate insulating film 15 When etching the gate electrode 16 of the first metal layer 72, the gate insulating film 15 is over-etched by about 30 nm. For this reason, when high-performance thin film transistors 4 and 5 are formed by the gate electrode 16 and the gate insulating film 15, if the gate insulating film 15 is thin, the gate insulating film 15 in the portion that becomes the pixel auxiliary capacitance 6 is formed. The film thickness becomes thin.
- the polysilicon film 71 When the polysilicon film 71 is formed by laser annealing, there is a possibility that a projection may be formed on the surface of the polysilicon film 71. Therefore, when the thickness of the gate insulating film 15 in the portion that becomes the capacitor portion 22 of the pixel auxiliary capacitor 6 is thin, the capacitor portion 22 formed of the polysilicon film 71 and the capacitor formed of the second metal layer 73 are used. There is a possibility that the space between the capacitance portion 22 and the capacitance wiring portion 23 may leak due to insufficient insulation from the wiring portion 23. . As a result, the liquid crystal display device 1 may have a point defect, and the yield may be reduced.
- the thickness of the gate insulating film 15 is small (for example, 9
- the capacitance between the capacitance portion 22 and the capacitance wiring portion 23 of the pixel auxiliary capacitance 6 may be a circuit capacitance for driving the liquid crystal display device 1.
- the first metal layer 72 may be made of an alloy containing molybdenum (Mo), that is, any of molybdenum-tungsten (MoW) and molybdenum-tantanole (MoTa).
- Mo molybdenum
- MoTa molybdenum-tungsten
- MoTa molybdenum-tantanole
- an alloy containing aluminum (A1) that is, at least one of aluminum (A1) and aluminum-copper (AlCu), molybdenum (Mo), titanium (Ti) ) And at least one of titanium nitride (TiN).
- the number of steps can be minimized to reduce the thickness and the resistance of the gate wiring, so that the liquid crystal display device can achieve high definition, high aperture ratio, low power consumption, and at the same time, memory. It will be possible to form liquid crystal display devices with thin-film transistors that incorporate circuits and drive circuits that have previously been TAB-mounted.
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- Engineering & Computer Science (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Power Engineering (AREA)
- Condensed Matter Physics & Semiconductors (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Computer Hardware Design (AREA)
- Liquid Crystal (AREA)
- Ceramic Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Thin Film Transistor (AREA)
- Electrodes Of Semiconductors (AREA)
- Internal Circuitry In Semiconductor Integrated Circuit Devices (AREA)
- Devices For Indicating Variable Information By Combining Individual Elements (AREA)
Abstract
Description
Claims
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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US11/141,025 US20050218407A1 (en) | 2003-08-18 | 2005-06-01 | Array substrate, liquid crystal display device and method of manufacturing array substrate |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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JP2003294583A JP4723800B2 (ja) | 2003-08-18 | 2003-08-18 | アレイ基板の製造方法 |
JP2003-294583 | 2003-08-18 |
Related Child Applications (1)
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US11/141,025 Continuation US20050218407A1 (en) | 2003-08-18 | 2005-06-01 | Array substrate, liquid crystal display device and method of manufacturing array substrate |
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WO2005018006A1 true WO2005018006A1 (ja) | 2005-02-24 |
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PCT/JP2004/011610 WO2005018006A1 (ja) | 2003-08-18 | 2004-08-12 | アレイ基板、液晶表示装置およびアレイ基板の製造方法 |
Country Status (5)
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JP (1) | JP4723800B2 (ja) |
KR (1) | KR20060036372A (ja) |
CN (1) | CN1745480A (ja) |
TW (1) | TWI288845B (ja) |
WO (1) | WO2005018006A1 (ja) |
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JP5060738B2 (ja) * | 2006-04-28 | 2012-10-31 | 株式会社ジャパンディスプレイイースト | 画像表示装置 |
TWI297548B (en) | 2006-06-19 | 2008-06-01 | Au Optronics Corp | Pixel structure for flat panel display and method for fabricating the same |
CN100414367C (zh) * | 2006-11-01 | 2008-08-27 | 友达光电股份有限公司 | 液晶显示结构及其制造方法 |
JP2010039444A (ja) * | 2008-08-08 | 2010-02-18 | Toshiba Mobile Display Co Ltd | 表示装置 |
JP5330124B2 (ja) * | 2009-07-02 | 2013-10-30 | 株式会社ジャパンディスプレイ | 光センサ内蔵画像表示装置 |
WO2013183495A1 (ja) * | 2012-06-08 | 2013-12-12 | シャープ株式会社 | 半導体装置およびその製造方法 |
KR102285384B1 (ko) * | 2014-09-15 | 2021-08-04 | 삼성디스플레이 주식회사 | 박막 트랜지스터 어레이 기판, 그 제조방법 및 표시 장치 |
KR101724278B1 (ko) * | 2014-12-02 | 2017-04-10 | 엘지디스플레이 주식회사 | 인셀 터치 액정 디스플레이 장치 |
KR20180079503A (ko) * | 2016-12-30 | 2018-07-11 | 삼성디스플레이 주식회사 | 도전 패턴 및 이를 구비하는 표시 장치 |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0613615A (ja) * | 1992-04-10 | 1994-01-21 | Fujitsu Ltd | 半導体装置の製造方法 |
JPH07104312A (ja) * | 1993-09-30 | 1995-04-21 | Sanyo Electric Co Ltd | 液晶表示装置の製造方法 |
JPH07318978A (ja) * | 1994-05-20 | 1995-12-08 | Sony Corp | 表示素子用薄膜トランジスタアレイ |
JPH08213626A (ja) * | 1995-01-31 | 1996-08-20 | Sony Corp | 薄膜半導体装置及びその製造方法 |
JPH1096956A (ja) * | 1996-09-24 | 1998-04-14 | Toshiba Corp | 液晶表示装置及びその製造方法 |
-
2003
- 2003-08-18 JP JP2003294583A patent/JP4723800B2/ja not_active Expired - Lifetime
-
2004
- 2004-08-12 WO PCT/JP2004/011610 patent/WO2005018006A1/ja active Application Filing
- 2004-08-12 CN CN 200480003008 patent/CN1745480A/zh active Pending
- 2004-08-12 KR KR1020057014038A patent/KR20060036372A/ko not_active Application Discontinuation
- 2004-08-18 TW TW93124851A patent/TWI288845B/zh not_active IP Right Cessation
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0613615A (ja) * | 1992-04-10 | 1994-01-21 | Fujitsu Ltd | 半導体装置の製造方法 |
JPH07104312A (ja) * | 1993-09-30 | 1995-04-21 | Sanyo Electric Co Ltd | 液晶表示装置の製造方法 |
JPH07318978A (ja) * | 1994-05-20 | 1995-12-08 | Sony Corp | 表示素子用薄膜トランジスタアレイ |
JPH08213626A (ja) * | 1995-01-31 | 1996-08-20 | Sony Corp | 薄膜半導体装置及びその製造方法 |
JPH1096956A (ja) * | 1996-09-24 | 1998-04-14 | Toshiba Corp | 液晶表示装置及びその製造方法 |
Also Published As
Publication number | Publication date |
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TWI288845B (en) | 2007-10-21 |
CN1745480A (zh) | 2006-03-08 |
TW200510851A (en) | 2005-03-16 |
JP4723800B2 (ja) | 2011-07-13 |
KR20060036372A (ko) | 2006-04-28 |
JP2005064337A (ja) | 2005-03-10 |
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