WO2012132953A1 - 表示装置 - Google Patents
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- Publication number
- WO2012132953A1 WO2012132953A1 PCT/JP2012/056828 JP2012056828W WO2012132953A1 WO 2012132953 A1 WO2012132953 A1 WO 2012132953A1 JP 2012056828 W JP2012056828 W JP 2012056828W WO 2012132953 A1 WO2012132953 A1 WO 2012132953A1
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- WIPO (PCT)
- Prior art keywords
- film
- display device
- liquid crystal
- electrode
- crystal display
- Prior art date
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Images
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- 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
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- 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
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- 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
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- 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
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- G02F1/136277—Active matrix addressed cells formed on a semiconductor substrate, e.g. of silicon
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- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/136—Liquid crystal cells structurally associated with a semi-conducting layer or substrate, e.g. cells forming part of an integrated circuit
- G02F1/1362—Active matrix addressed cells
- G02F1/1368—Active matrix addressed cells in which the switching element is a three-electrode device
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10D—INORGANIC ELECTRIC SEMICONDUCTOR DEVICES
- H10D30/00—Field-effect transistors [FET]
- H10D30/60—Insulated-gate field-effect transistors [IGFET]
- H10D30/67—Thin-film transistors [TFT]
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- 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
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- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/133308—Support structures for LCD panels, e.g. frames or bezels
- G02F1/133311—Environmental protection, e.g. against dust or humidity
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- G—PHYSICS
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- 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
- G02F1/133357—Planarisation layers
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- G—PHYSICS
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- 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
- G02F1/1343—Electrodes
- G02F1/134309—Electrodes characterised by their geometrical arrangement
- G02F1/134372—Electrodes characterised by their geometrical arrangement for fringe field switching [FFS] where the common electrode is not patterned
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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
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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
- G02F2201/00—Constructional arrangements not provided for in groups G02F1/00 - G02F7/00
- G02F2201/50—Protective arrangements
- G02F2201/501—Blocking layers, e.g. against migration of ions
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10D—INORGANIC ELECTRIC SEMICONDUCTOR DEVICES
- H10D30/00—Field-effect transistors [FET]
- H10D30/60—Insulated-gate field-effect transistors [IGFET]
- H10D30/67—Thin-film transistors [TFT]
- H10D30/6704—Thin-film transistors [TFT] having supplementary regions or layers in the thin films or in the insulated bulk substrates for controlling properties of the device
- H10D30/6725—Thin-film transistors [TFT] having supplementary regions or layers in the thin films or in the insulated bulk substrates for controlling properties of the device having supplementary regions or layers for improving the flatness of the device
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10D—INORGANIC ELECTRIC SEMICONDUCTOR DEVICES
- H10D86/00—Integrated devices formed in or on insulating or conducting substrates, e.g. formed in silicon-on-insulator [SOI] substrates or on stainless steel or glass substrates
- H10D86/40—Integrated devices formed in or on insulating or conducting substrates, e.g. formed in silicon-on-insulator [SOI] substrates or on stainless steel or glass substrates characterised by multiple TFTs
- H10D86/451—Integrated devices formed in or on insulating or conducting substrates, e.g. formed in silicon-on-insulator [SOI] substrates or on stainless steel or glass substrates characterised by multiple TFTs characterised by the compositions or shapes of the interlayer dielectrics
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10D—INORGANIC ELECTRIC SEMICONDUCTOR DEVICES
- H10D86/00—Integrated devices formed in or on insulating or conducting substrates, e.g. formed in silicon-on-insulator [SOI] substrates or on stainless steel or glass substrates
- H10D86/40—Integrated devices formed in or on insulating or conducting substrates, e.g. formed in silicon-on-insulator [SOI] substrates or on stainless steel or glass substrates characterised by multiple TFTs
- H10D86/60—Integrated devices formed in or on insulating or conducting substrates, e.g. formed in silicon-on-insulator [SOI] substrates or on stainless steel or glass substrates characterised by multiple TFTs wherein the TFTs are in active matrices
Definitions
- the present invention relates to a display device such as a liquid crystal display device.
- liquid crystal display devices have been used in various fields and in various environments.
- the liquid crystal display device is used, for example, in a high temperature and high humidity environment.
- TFTs thin film transistors
- FIG. 16 is a cross-sectional view of a conventional liquid crystal display device.
- the liquid crystal display device shown in FIG. 16 has a structure in which a TFT substrate 81 and a counter substrate 82 are bonded to each other, and a liquid crystal 83 is sealed between two substrates.
- a seal 84 is provided around a portion where the two substrates face each other.
- the TFT substrate 81 is obtained by forming a TFT 86 on a glass substrate 85 and forming a protective film 87 and a planarizing film 88 thereon.
- the planarizing film 88 for example, an acrylic resin film is used.
- the planarizing film 88 made of acrylic resin has high hygroscopicity. For this reason, when the liquid crystal display device is used in a high-temperature and high-humidity environment, moisture in the air enters the planarizing film 88 from the vicinity of the seal 84 (see arrow A1). The intruded moisture diffuses in the planarizing film 88 and reaches the vicinity of the TFT 86.
- the TFT 86 is covered with the protective film 87, it is difficult to completely cover the TFT 86 with the protective film 87 because the surface of the TFT 86 has irregularities. For this reason, moisture may pass through the protective film 87 and reach the interface between the protective film 87 and the semiconductor layer 89. At this time, the characteristics of the TFT 86 greatly vary under the influence of moisture.
- Patent Document 1 describes a liquid crystal display device for solving this problem (see FIGS. 17 and 18).
- the end surface of the planarization film 91 is covered with a seal 92.
- the end surface of the planarizing film 91 is covered with a protective film 95.
- Patent Document 1 describes a liquid crystal display device configured so that the planarizing film 91 does not directly contact air.
- an object of the present invention is to provide a display device that can prevent display deterioration caused by moisture absorption of a planarizing film.
- a first aspect of the present invention is a display device having a structure in which two substrates are bonded together, A first substrate including a thin film transistor formed on an insulating substrate and a planarization film covering the thin film transistor; A second substrate disposed opposite to the first substrate, The first substrate may further include a moisture-proof protective film that covers the entire surface of the planarization film.
- a seal provided around a portion where the first and second substrates face each other; An end face of the planarization film is disposed in a region surrounded by the seal or under the seal.
- the end face of the planarization film has a taper shape.
- the first substrate further includes a pixel electrode provided on the opposite side of the planarization film with the protective film interposed therebetween, and a contact portion that electrically connects the pixel electrode and the electrode of the thin film transistor,
- the protective film is formed on a side surface of the contact portion.
- the first substrate is provided on one surface side of the protective film, and is provided on the other surface side of the first electrode electrically connected to the electrode of the thin film transistor and electrically connected to the common wiring. And a second electrode connected to each other.
- a sixth aspect of the present invention is the fifth aspect of the present invention,
- the first electrode has a slit shape.
- the protective film is any one of a SiO 2 film, a SiN film, a SiON film, and a laminated film thereof.
- the thin film transistor includes a semiconductor layer formed of an oxide semiconductor.
- the thin film transistor includes a semiconductor layer formed of either amorphous silicon or crystalline silicon.
- the planarizing film is a resin film.
- the protective film is provided on a flat surface, the coverage of the flattened film is enhanced. Therefore, by covering the entire surface of the planarization film with a protective film having moisture resistance, moisture can be prevented from entering the planarization film, and display deterioration due to moisture absorption of the planarization film can be prevented. .
- the end face of the flattening film is disposed in the region surrounded by the seal or under the seal to prevent the end face of the flattening film from directly contacting the air, Display deterioration caused by moisture absorption of the planarizing film can be more effectively prevented.
- the end face of the flattening film is tapered to increase the coverage of the end face of the flattening film, and display deterioration due to moisture absorption of the flattening film is more effective. Can be prevented.
- the moisture intrusion route to the planarizing film is reduced, and display deterioration due to moisture absorption of the planarizing film is achieved. Can be prevented more effectively.
- a capacitor can be formed by sandwiching a protective film provided for moisture prevention between two electrodes, and the formed capacitor can be used as an auxiliary capacitor.
- the auxiliary capacitor can be made light transmissive and the aperture ratio of the display element can be increased.
- a fringe electric field can be generated by making the first electrode into a slit shape. Therefore, in the liquid crystal display device, the orientation of the liquid crystal can be controlled using the generated fringe electric field, and the viewing angle characteristics can be improved.
- moisture penetration into the planarizing film is prevented by using a moisture-proof SiO 2 film, SiN film, SiON film, or a laminated film thereof as a protective film.
- a moisture-proof SiO 2 film, SiN film, SiON film, or a laminated film thereof as a protective film.
- display deterioration due to moisture absorption of the planarizing film can be prevented. This effect becomes significant when a SiN film or a SiON film having high moisture resistance is used.
- a display device including an oxide semiconductor TFT whose characteristics greatly fluctuate when affected by moisture display deterioration due to moisture absorption of the planarization film can be prevented.
- a display device including an amorphous silicon TFT or a crystalline silicon TFT, display deterioration due to moisture absorption of the planarization film can be prevented.
- flattening is performed by covering the entire surface of the flattening film using a protective film having moisture resistance. Intrusion of moisture into the film can be prevented, and display deterioration due to moisture absorption of the planarization film can be prevented.
- FIG. 1 is a cross-sectional view of a liquid crystal display device according to a first embodiment of the present invention. It is a figure which shows the manufacturing process of the liquid crystal display device shown in FIG. It is a continuation figure of FIG. 2A. It is a continuation figure of FIG. 2B. It is a continuation figure of FIG. 2C. It is a continuation figure of FIG. 2D. It is a continuation figure of FIG. 2E. It is a continuation figure of FIG. 2F. It is a continuation figure of FIG. 2G. It is a continuation figure of FIG. 2H. It is a figure which shows the example of the characteristic change of an oxide semiconductor TFT.
- FIG. 2A shows the manufacturing process of the liquid crystal display device shown in FIG.
- FIG. 2B It is a continuation figure of FIG. 2C.
- FIG. 2D It is a continuation figure of FIG. 2D.
- FIG. 2E It is a continuation figure of FIG. 2F.
- FIG. 2G It is a continuation figure of FIG.
- FIG. 2 is a cross-sectional view illustrating a first configuration example of a terminal portion of the liquid crystal display device illustrated in FIG. 1. It is sectional drawing which shows the 2nd structural example of the terminal part of the liquid crystal display device shown in FIG.
- FIG. 2 is a cross-sectional view illustrating a first configuration example of a contact portion of the liquid crystal display device illustrated in FIG. 1.
- FIG. 4 is a cross-sectional view illustrating a second configuration example of a contact portion of the liquid crystal display device illustrated in FIG. 1.
- FIG. 6 is a cross-sectional view illustrating a third configuration example of a contact portion of the liquid crystal display device illustrated in FIG. 1. It is sectional drawing of the liquid crystal display device which concerns on the 2nd Embodiment of this invention.
- FIG. 1 is a cross-sectional view of a liquid crystal display device according to the first embodiment of the present invention.
- a liquid crystal display device 100 shown in FIG. 1 has a structure in which a TFT substrate 10 and a counter substrate 2 are bonded to each other, and a liquid crystal 3 is sealed between two substrates.
- the TFT substrate 10 and the counter substrate 2 are disposed to face each other, and a resin seal 4 is provided around a portion where the two substrates face each other.
- the counter substrate 2 is provided with a counter electrode, a color filter (both not shown), and the like.
- the TFT substrate 10 and various wirings are formed on the TFT substrate 10.
- the TFT 1 is formed by sequentially forming a gate electrode 12, a gate insulating film 13, a semiconductor layer 14, and a source / drain electrode 15 on a glass substrate 11.
- a protective film 16, a resin flattening film 17 (hereinafter referred to as a flattening resin film), and a moisture-proof protective film 18 are sequentially formed on the substrate after the TFT 1 is formed.
- the protective film 16 is provided to protect the TFT 1 by preventing the TFT 1 and the planarizing resin film 17 from directly contacting each other.
- the planarizing resin film 17 is provided for planarizing the surface of the substrate.
- the end surface of the planarizing resin film 17 is provided in a region surrounded by the seal 4 (hereinafter referred to as the inside of the seal 4).
- the size of the flattening resin film 17 is larger as it is closer to the glass substrate 11, and the end surface of the flattening resin film 17 has a tapered shape.
- the protective film 18 is provided so as to cover the entire surface of the planarizing resin film 17 in order to prevent moisture from entering the planarizing resin film 17.
- the gate electrode 12 and the source / drain electrode 15 are formed using, for example, Cu / Ti.
- the gate insulating film 13 for example, a SiO 2 film, a SiN film, or a laminated film thereof is used.
- the semiconductor layer 14 is formed using an oxide semiconductor such as amorphous silicon, crystalline silicon, or IGZO (Indium Gallium Zinc Oxide).
- the protective film 16 for example, a SiO 2 film, a SiN x film, a SiON film, or a laminated film thereof is used.
- the planarizing resin film 17 for example, an acrylic resin film or the like is used as a resin film that has insulating properties and light transmittance and can be easily processed.
- the protective film 18 for example, a SiO 2 film, a SiN film, a SiON film, or a laminated film thereof is used. Note that another insulating substrate may be used instead of the glass substrate 11.
- a manufacturing method of the liquid crystal display device 100 having the contact portion 5 will be described with reference to FIGS. 2A to 2I.
- the gate electrode 12 is formed on the glass substrate 11 using Cu / Ti or the like (FIG. 2A).
- a gate insulating film 13 covering the surface of the substrate is formed by forming a SiO 2 film, a SiN film, or a laminated film thereof on the substrate (FIG. 2B).
- a semiconductor layer 14 is formed over the gate electrode 12 using amorphous silicon, crystalline silicon, or an oxide semiconductor (eg, IGZO) (FIG. 2C).
- a sputtering method is used.
- a source / drain electrode 15 in contact with the semiconductor layer 14 is formed on the substrate using Cu / Ti or the like (FIG. 2D).
- a protective film 16 that covers the entire surface of the substrate is formed by forming a SiO 2 film, a SiN x film, a SiON film, or a laminated film thereof on the substrate (FIG. 2E).
- a planarizing resin film 17 that covers the entire surface of the substrate is formed using acrylic resin or the like. Thereafter, direct patterning is performed by photolithography to form an opening at a position where the contact portion 5 is to be formed (FIG. 2F).
- a protective film 18 covering the surface of the substrate including the entire surface of the planarizing resin film 17 is formed by forming a SiO 2 film, a SiN film, a SiON film, or a laminated film thereof on the substrate. .
- a contact hole reaching the drain electrode 15 is formed at a position where the contact portion 5 is formed by photolithography (FIG. 2G).
- a transparent conductive film 19 in contact with the drain electrode 15 is formed using ITO (Indium Tin Oxide) or IZO (Indium Zinc Oxide) (FIG. 2H).
- the transparent conductive film 19 is also formed inside the contact hole, whereby the contact portion 5 is formed.
- the transparent conductive film 19 formed on the protective film 18 functions as a pixel electrode.
- the pixel electrode is provided on the opposite side of the planarizing resin film 17 with the protective film 18 interposed therebetween, and the contact portion 5 electrically connects the pixel electrode and the drain electrode 15 of the TFT 1.
- the TFT substrate 10 is completed through the above
- an alignment film (not shown) is provided on the surface of the TFT substrate 10 on which the TFT 1 is formed and on the surface of the counter substrate 2 on which the counter electrode is formed.
- the TFT substrate 10 and the counter substrate 2 are arranged to face each other (the surface on which the alignment film is provided is made to face), a seal 4 is provided around a portion where the two substrates face each other, and the two substrates are separated by spacers ( The liquid crystal 3 is filled between the two substrates (FIG. 2I).
- the end surface of the planarizing resin film 17 is provided inside the seal 4.
- the liquid crystal display device 100 is completed through the above steps.
- the TFT substrate 10 of the liquid crystal display device 100 is provided with a moisture-proof protective film 18 that covers the entire surface of the planarizing resin film 17.
- the end surface of the planarizing resin film 17 is disposed inside the seal 4 and has a tapered shape.
- the protective film 18 is provided on a flat surface, the coverage of the flattening resin film 17 is enhanced. For this reason, even when moisture in the air enters the liquid crystal display device 100, it is possible to prevent moisture from entering the planarizing resin film 17. As a result, it is possible to prevent moisture from reaching the interface between the semiconductor layer 14 and the protective film 16 and to prevent the characteristics of the TFT 1 from being affected by moisture. Therefore, according to the liquid crystal display device 100, display deterioration due to moisture absorption of the planarizing resin film 17 can be prevented.
- the end surface of the flattening resin film 17 since the end surface of the flattening resin film 17 is disposed inside the seal 4, the end surface of the flattening resin film 17 does not directly contact air. Since the resin-made seal 4 has moisture resistance, moisture that enters the apparatus can be reduced by the moisture-proof effect of the seal 4. By disposing the end surface of the flattening resin film 17 inside the seal 4 in this way, the end surface of the flattening resin film 17 is prevented from coming into direct contact with air, and display caused by moisture absorption of the flattening resin film 17 is achieved. Deterioration can be prevented more effectively.
- the end surface of the flattening resin film 17 in a tapered shape, the coverage of the end surface of the flattening resin film 17 can be increased. Thereby, it is possible to more effectively prevent moisture from entering the planarizing resin film 17 and more effectively prevent display deterioration due to moisture absorption of the planarizing resin film 17.
- FIG. 3 is a diagram illustrating an example of a characteristic change of the oxide semiconductor TFT.
- the horizontal axis represents the gate voltage
- the vertical axis represents the drain current.
- FIG. 3 shows an initial characteristic (thin broken line) of a certain oxide semiconductor TFT, characteristics after 2000 hours in a conventional liquid crystal display device (thick broken line), and 2000 hours in the liquid crystal display device 100 according to the present embodiment. The characteristics after the passage (thick solid line) are described.
- the resin flattened film absorbs moisture in the air
- the characteristics of the oxide semiconductor TFT greatly change from the initial characteristics after 2000 hours. For this reason, display deterioration occurs in a conventional liquid crystal display device including an oxide semiconductor TFT.
- the planarizing resin film 17 does not absorb moisture in the air
- the characteristics of the oxide semiconductor TFT hardly change from the initial characteristics even after 2000 hours. As can be seen from this example, according to the liquid crystal display device 100, display deterioration due to moisture absorption of the planarization film can be prevented.
- the protective film 18 for example, a SiO 2 film, a SiN film, a SiON film, or a laminated film thereof can be used.
- the SiN film and the SiON film have high moisture resistance. Therefore, in the liquid crystal display device provided with the SiN film or the SiON film as the protective film 18, the above effect becomes remarkable.
- the amorphous silicon TFT the crystalline silicon TFT, and the oxide semiconductor TFT
- the characteristics of the oxide semiconductor TFT greatly fluctuate when affected by moisture. Therefore, in the liquid crystal display device including the oxide semiconductor TFT, the above effect becomes remarkable.
- the end surface of the flattening resin film 17 is disposed inside the seal 4, but the end surface of the flattening resin film 17 may be disposed under the seal 4. Even when the end surface of the flattening resin film 17 is provided under the seal 4, the same effect as that provided when the end surface is provided inside the seal 4 is obtained. Further, if a sufficient effect can be obtained with only the protective film 18, the end surface of the planarizing resin film 17 may be disposed outside the region surrounded by the seal 4.
- the liquid crystal display device 100 is provided with the protective film 16, the liquid crystal display device may not necessarily include the protective film 16.
- the protective film 16 is provided in order to prevent the planarization resin film 17 that is an organic material from being in contact with the semiconductor layer 14 and reducing the reliability of the TFT 1. By providing the protective film 16, the reliability of the liquid crystal display device 100 can be increased.
- the configuration of the terminal portion and the contact portion of the liquid crystal display device 100 will be described.
- the gate electrode is used as a terminal, an opening reaching the gate electrode is formed.
- the reliability of the terminal can be increased by providing the transparent electrode 7 that covers the gate electrode 6 as shown in FIG.
- the source electrode is used as a terminal, an opening reaching the source electrode is formed.
- the reliability of the terminal can be increased by providing the transparent electrode 9 that covers the source electrode 8 as shown in FIG.
- the following configuration can be considered for the contact portion connecting the gate electrode and the source electrode.
- FIG. 6 In the first configuration example (FIG. 6), an opening is formed in the gate insulating film 13, and the source wiring 51 is disposed in the opening. Thereby, the contact part 52 which connects the gate electrode 12 and the source electrode is formed.
- the gate electrode 12 and the source electrode are connected using ITO, IZO, or the like, similarly to the pixel electrode 53. Since ITO and IZO are formed by sputtering, if a wiring for connecting the stages is formed using ITO or IZO, disconnection of the wiring is likely to occur. Therefore, the pattern end of IGZO is arranged outside the pattern end of the source wiring, and the size of the opening is increased in the lower layer. According to this method, since the contact portion 54 can be formed with only one opening, the area efficiency can be increased. Moreover, since each layer can be patterned and etched at once, the manufacturing process can be shortened.
- the contact 55 for the gate electrode 12 and the contact 57 for the source electrode 56 are formed separately, and the two contacts 55 and 57 are connected using the pixel electrode 58. According to this method, the contact portion can be easily formed.
- FIG. 9 is a cross-sectional view of a liquid crystal display device according to the second embodiment of the present invention.
- a liquid crystal display device 200 shown in FIG. 9 has a structure in which the TFT substrate 20 and the counter substrate 2 are bonded together and the liquid crystal 3 is sealed between the two substrates.
- the same elements as those described above are denoted by the same reference numerals and description thereof is omitted.
- the TFT substrate 20 of the liquid crystal display device 200 includes a pixel electrode provided on the opposite side of the planarizing resin film 17 with the protective film 18 interposed therebetween, a pixel electrode, and a drain electrode 15 of the TFT 1. And a contact portion 5 for electrically connecting the two.
- the protective film 18 is not formed on the side surface of the contact portion 5 (see FIG. 2I).
- the protective film 18 is formed not only on the planarizing resin film 17 but also on the side surface of the contact portion 5.
- the moisture intrusion route to the planarizing resin film 17 can be reduced by forming the moisture-proof protective film 18 on the side surface of the contact portion 5. Accordingly, display deterioration due to moisture absorption of the planarizing resin film 17 can be more effectively prevented.
- FIG. 10 is a cross-sectional view of a liquid crystal display device according to the third embodiment of the present invention.
- a liquid crystal display device 300 shown in FIG. 10 has a structure in which the TFT substrate 30 and the counter substrate 2 are bonded together, and the liquid crystal 3 is sealed between the two substrates.
- a common wiring 31 to which a common voltage is applied is formed on the substrate after the gate insulating film 13 is formed.
- a lower layer electrode 33 that is electrically connected to the common wiring 31 is formed on the planarizing resin film 17, a lower layer electrode 33 that is electrically connected to the common wiring 31 is formed.
- the protective film 18 is formed so as to cover the entire surface of the planarizing resin film 17 and the lower layer electrode 33.
- an upper layer electrode 32 electrically connected to the drain electrode 15 is formed so as to face the lower layer electrode 33 with the protective film 18 interposed therebetween.
- the TFT substrate 30 is provided on one surface side of the protective film 18, and is provided on the other surface side of the protective film 18 and the upper layer electrode 32 electrically connected to the drain electrode 15 of the TFT 1.
- a lower layer electrode 33 electrically connected to the wiring 31.
- a capacitor is formed by sandwiching the protective film 18 provided for moisture prevention between two electrodes (the upper layer electrode 32 and the lower layer electrode 33), and the formed capacitor is used as an auxiliary capacitor.
- the auxiliary capacitor can be made light transmissive and the aperture ratio of the display element can be increased.
- FIG. 11 is a cross-sectional view of a liquid crystal display device according to the fourth embodiment of the present invention.
- a liquid crystal display device 400 shown in FIG. 11 has a structure in which the TFT substrate 40 and the counter substrate 2 are bonded together and the liquid crystal 3 is sealed between the two substrates.
- the common wiring 31, the upper layer electrode 41, and the lower layer electrode 33 are formed on the TFT substrate 40 of the liquid crystal display device 400.
- the upper layer electrode 41 has a slit shape.
- FIG. 12 is a plan view of the liquid crystal display device 400. As shown in FIG. 12, the slit-like upper layer electrode 41 and the planar lower layer electrode 33 are arranged so as to overlap in a region surrounded by the common wiring 31, the gate wiring 42 and the data wiring 43. The lower layer electrode 33 is connected to a common wiring 31 to which a common voltage is applied. Thereby, a fringe electric field can be formed in the region.
- the slit-shaped electrode itself may be used as the upper layer electrode 41, or an electrode partially having a slit shape may be used as the upper layer electrode 41.
- the lower layer electrode 33 is not provided in a portion corresponding to the upper layer electrode 41 which is not slit-shaped, and a TN (Twisted Nematic) or vertical alignment liquid crystal mode is used for this portion. Accordingly, a fringe field mode liquid crystal display device having excellent viewing angle characteristics can be configured.
- the capacitance can be formed by sandwiching the protective film 18 provided for moisture prevention between the two electrodes (the upper layer electrode 32 and the lower layer electrode 33). Moreover, a fringe electric field can be generated by making the upper layer electrode 32 into a slit shape. Accordingly, the orientation of the liquid crystal can be controlled using the generated fringe electric field, and the viewing angle characteristics can be improved.
- the configurations of the terminal portions and contact portions of the liquid crystal display devices 200, 300, and 400 according to the second to fourth embodiments are the same as those of the liquid crystal display device 100 according to the first embodiment (FIGS. 4 to 4). 8).
- the bottom gate channel etch type TFT is used.
- a TFT having another structure may be used. Even when the TFT described below is used, the same effects as those of the first to fourth embodiments can be obtained.
- FIG. 13 is a cross-sectional view of a liquid crystal display device provided with an etch stopper type TFT.
- a channel protective film 61 is provided on the channel.
- the number of processes increases, but damage during etching is prevented, and stable production becomes possible.
- the channel protective film 61 is present, the TFT characteristics are less likely to fluctuate even under the influence of moisture.
- FIG. 14 is a cross-sectional view of a liquid crystal display device having a bottom contact type TFT.
- a source / drain electrode 15 is formed on a gate insulating film 13, and a semiconductor layer 14 is formed thereon.
- the semiconductor layer 14 is not damaged during channel etching.
- the semiconductor layer 14 and the planarizing resin film 17 are opposed to each other over a wide area, the effect of the present invention becomes more remarkable.
- FIG. 15 is a cross-sectional view of a liquid crystal display device having a top gate type TFT.
- the semiconductor layer 14 is formed after the source / drain electrode 15 is formed, and then the gate insulating film 13 and the gate electrode 12 are sequentially formed.
- the semiconductor layer 14 is not damaged during channel etching. Even with this structure, the effects of the present invention can be obtained.
- the display device of the present invention it is possible to prevent display deterioration due to moisture absorption of the planarization film.
- the display device of the present invention has a feature that it can prevent display deterioration due to moisture absorption of the planarization film, it can be used for various display devices having a structure in which two substrates are bonded, such as a liquid crystal display device. Can do.
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Abstract
Description
絶縁性基板上に形成された薄膜トランジスタと、前記薄膜トランジスタを覆う平坦化膜とを含む第1基板と、
前記第1基板に対向して配置される第2基板とを備え、
前記第1基板は、前記平坦化膜の表面全体を覆う防湿性の保護膜をさらに含むことを特徴とする。
前記第1および第2基板が対向する部分の周囲に設けられたシールをさらに備え、
前記平坦化膜の端面は、前記シールで囲まれた領域内、または、前記シールの下に配置されていることを特徴とする。
前記平坦化膜の端面は、テーパー形状を有することを特徴とする。
前記第1基板は、前記保護膜を挟んで前記平坦化膜とは反対側に設けられた画素電極と、前記画素電極と前記薄膜トランジスタの電極とを電気的に接続するコンタクト部とをさらに含み、
前記コンタクト部の側面には前記保護膜が形成されていることを特徴とする。
前記第1基板は、前記保護膜の一方の面側に設けられ、前記薄膜トランジスタの電極に電気的に接続された第1電極と、前記保護膜の他方の面側に設けられ、コモン配線に電気的に接続された第2電極とをさらに含むことを特徴とする。
前記第1電極はスリット形状を有することを特徴とする。
前記保護膜は、SiO2 膜、SiN膜、SiON膜、および、これらの積層膜のいずれかであることを特徴とする。
前記薄膜トランジスタは、酸化物半導体で形成された半導体層を有することを特徴とする。
前記薄膜トランジスタは、アモルファスシリコン、および、結晶性シリコンのいずれかで形成された半導体層を有することを特徴とする。
前記平坦化膜は樹脂膜であることを特徴とする。
図1は、本発明の第1の実施形態に係る液晶表示装置の断面図である。図1に示す液晶表示装置100は、TFT基板10と対向基板2を貼り合わせて、2枚の基板の間に液晶3を封入した構造を有する。TFT基板10と対向基板2は対向して配置され、2枚の基板が対向する部分の周囲には樹脂製のシール4が設けられる。対向基板2には、対向電極やカラーフィルタ(いずれも図示せず)などが設けられる。
図9は、本発明の第2の実施形態に係る液晶表示装置の断面図である。図9に示す液晶表示装置200は、TFT基板20と対向基板2を貼り合わせて、2枚の基板の間に液晶3を封入した構造を有する。以下に示す各実施形態の構成要素のうち、先に述べた実施形態と同一の要素については、同一の参照符号を付して説明を省略する。
図10は、本発明の第3の実施形態に係る液晶表示装置の断面図である。図10に示す液晶表示装置300は、TFT基板30と対向基板2を貼り合わせて、2枚の基板の間に液晶3を封入した構造を有する。
図11は、本発明の第4の実施形態に係る液晶表示装置の断面図である。図11に示す液晶表示装置400は、TFT基板40と対向基板2を貼り合わせて、2枚の基板の間に液晶3を封入した構造を有する。
2…対向基板
3…液晶
4…シール
5…コンタクト部
10、20、30、40…TFT基板
11…ガラス基板
12…ゲート電極
13…ゲート絶縁膜
14…半導体層
15…ソース/ドレイン電極
16、18…保護膜
17…平坦化樹脂膜
19…透明導電膜
31…コモン配線
32、41…上層電極
33…下層電極
100、200、300、400…液晶表示装置
Claims (10)
- 2枚の基板を貼り合わせた構造を有する表示装置であって、
絶縁性基板上に形成された薄膜トランジスタと、前記薄膜トランジスタを覆う平坦化膜とを含む第1基板と、
前記第1基板に対向して配置される第2基板とを備え、
前記第1基板は、前記平坦化膜の表面全体を覆う防湿性の保護膜をさらに含むことを特徴とする、表示装置。 - 前記第1および第2基板が対向する部分の周囲に設けられたシールをさらに備え、
前記平坦化膜の端面は、前記シールで囲まれた領域内、または、前記シールの下に配置されていることを特徴とする、請求項1に記載の表示装置。 - 前記平坦化膜の端面は、テーパー形状を有することを特徴とする、請求項2に記載の表示装置。
- 前記第1基板は、前記保護膜を挟んで前記平坦化膜とは反対側に設けられた画素電極と、前記画素電極と前記薄膜トランジスタの電極とを電気的に接続するコンタクト部とをさらに含み、
前記コンタクト部の側面には前記保護膜が形成されていることを特徴とする、請求項2に記載の表示装置。 - 前記第1基板は、前記保護膜の一方の面側に設けられ、前記薄膜トランジスタの電極に電気的に接続された第1電極と、前記保護膜の他方の面側に設けられ、コモン配線に電気的に接続された第2電極とをさらに含むことを特徴とする、請求項2に記載の表示装置。
- 前記第1電極はスリット形状を有することを特徴とする、請求項5に記載の表示装置。
- 前記保護膜は、SiO2 膜、SiN膜、SiON膜、および、これらの積層膜のいずれかであることを特徴とする、請求項2に記載の表示装置。
- 前記薄膜トランジスタは、酸化物半導体で形成された半導体層を有することを特徴とする、請求項2に記載の表示装置。
- 前記薄膜トランジスタは、アモルファスシリコン、および、結晶性シリコンのいずれかで形成された半導体層を有することを特徴とする、請求項2に記載の表示装置。
- 前記平坦化膜は樹脂膜であることを特徴とする、請求項2に記載の表示装置。
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US14/006,479 US9377644B2 (en) | 2011-03-25 | 2012-03-16 | Display device |
EP12763589.4A EP2690492A4 (en) | 2011-03-25 | 2012-03-16 | DISPLAY DEVICE |
CN201280012567XA CN103430088A (zh) | 2011-03-25 | 2012-03-16 | 显示装置 |
BR112013022675A BR112013022675A2 (pt) | 2011-03-25 | 2012-03-16 | dispositivo de visor |
JP2013507381A JP5318302B2 (ja) | 2011-03-25 | 2012-03-16 | 表示装置 |
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EP (1) | EP2690492A4 (ja) |
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JP2018185516A (ja) * | 2012-10-12 | 2018-11-22 | 株式会社半導体エネルギー研究所 | 液晶表示装置 |
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CN105247408A (zh) * | 2013-06-11 | 2016-01-13 | 堺显示器制品株式会社 | 液晶面板和绝缘膜的槽部形成方法 |
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CN103439844B (zh) * | 2013-08-30 | 2016-06-01 | 京东方科技集团股份有限公司 | 阵列基板、显示装置及制作阵列基板的方法 |
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Also Published As
Publication number | Publication date |
---|---|
CN103430088A (zh) | 2013-12-04 |
BR112013022675A2 (pt) | 2016-12-06 |
US9377644B2 (en) | 2016-06-28 |
KR101514594B1 (ko) | 2015-04-22 |
EP2690492A4 (en) | 2015-03-04 |
US20140009706A1 (en) | 2014-01-09 |
JPWO2012132953A1 (ja) | 2014-07-28 |
KR20130132648A (ko) | 2013-12-04 |
EP2690492A1 (en) | 2014-01-29 |
JP5318302B2 (ja) | 2013-10-16 |
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