WO2012165221A1 - 液晶表示装置およびその製造方法 - Google Patents
液晶表示装置およびその製造方法 Download PDFInfo
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- WO2012165221A1 WO2012165221A1 PCT/JP2012/063046 JP2012063046W WO2012165221A1 WO 2012165221 A1 WO2012165221 A1 WO 2012165221A1 JP 2012063046 W JP2012063046 W JP 2012063046W WO 2012165221 A1 WO2012165221 A1 WO 2012165221A1
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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
- G02F1/1343—Electrodes
- G02F1/13439—Electrodes characterised by their electrical, optical, physical properties; materials therefor; method of making
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/136—Liquid crystal cells structurally associated with a semi-conducting layer or substrate, e.g. cells forming part of an integrated circuit
- G02F1/1362—Active matrix addressed cells
- G02F1/136209—Light shielding layers, e.g. black matrix, incorporated in the active matrix substrate, e.g. structurally associated with the switching element
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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
- G02F1/1343—Electrodes
- G02F1/134309—Electrodes characterised by their geometrical arrangement
- G02F1/134363—Electrodes characterised by their geometrical arrangement for applying an electric field parallel to the substrate, i.e. in-plane switching [IPS]
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/136—Liquid crystal cells structurally associated with a semi-conducting layer or substrate, e.g. cells forming part of an integrated circuit
- G02F1/1362—Active matrix addressed cells
- G02F1/136218—Shield electrodes
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/136—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
- G02F1/136286—Wiring, e.g. gate line, drain line
- G02F1/13629—Multilayer wirings
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/136—Liquid crystal cells structurally associated with a semi-conducting layer or substrate, e.g. cells forming part of an integrated circuit
- G02F1/1362—Active matrix addressed cells
- G02F1/136286—Wiring, e.g. gate line, drain line
- G02F1/136295—Materials; Compositions; Manufacture processes
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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
- G02F2201/40—Arrangements for improving the aperture ratio
Definitions
- the present invention relates to a liquid crystal display device used for various purposes such as a mobile phone, a digital camera, a portable game machine, or a portable information terminal.
- a horizontal electric field type liquid crystal display device includes a pair of substrates facing each other and a liquid crystal layer interposed between the pair of substrates, and a gate wiring, a source wiring, and a TFT (thin film transistor) on one of the pair of substrates.
- the signal electrode and the common electrode are formed.
- the signal electrode and the common electrode are alternately positioned on the same plane, and an electric field is applied between the signal electrode and the common electrode by applying a voltage to the signal electrode and the common electrode.
- the direction of liquid crystal molecules in the liquid crystal layer is controlled by this electric field.
- a wide viewing angle can be achieved by controlling the direction of liquid crystal molecules by this lateral electric field.
- liquid crystal display devices are required to have a high display quality, and in order to improve the display quality, in addition to a wide viewing angle, an increase in brightness is achieved.
- a black matrix on array (hereinafter referred to as BOA) technology exists as a technology for making these compatible (see Japanese Patent Application Laid-Open No. 2006-301505).
- BOA black matrix on array
- the light shielding film is formed on the array substrate side on which the signal electrodes and the like are formed so as to cover the gate wiring, the source wiring, etc., it is necessary to provide a positional deviation margin when the substrates are bonded to the light shielding film.
- the width of the light shielding film can be reduced, the aperture ratio of the pixel can be increased, and the luminance can be increased.
- the light shielding film exists on the array substrate on which the electrodes such as the signal electrode and the common electrode are formed, the entire electrode can be concealed by the light shielding film in a wide viewing angle range. It is possible to prevent the contrast from being lowered.
- the voltage of the signal electrode is likely to fluctuate due to the voltage fluctuation of the source wiring through the coupling capacitance generated between the source wiring and the signal electrode, which affects the display quality. There is a point.
- the present invention has been made in view of the above-described problems, and an object of the present invention is to suppress a decrease in luminance due to a shield electrode while suppressing an influence on a signal electrode due to a voltage variation of a source line in a liquid crystal display device. It is to plan.
- the liquid crystal display device of the present invention includes a first substrate and a second substrate that are disposed with their main surfaces facing each other, a liquid crystal layer that is disposed between the first substrate and the second substrate, and the second substrate.
- a plurality of gate wirings provided on the main surface of the substrate; a plurality of source wirings disposed so as to intersect the plurality of gate wirings; a light shielding film provided to cover the source wirings;
- a first insulating film provided so as to cover the gate wiring, the plurality of source wirings and the light shielding film, a signal electrode provided on the first insulating film, and the signal on the first insulating film
- An electrode and the source wiring Wherein the shield electrode so as to overlap the light shielding film is provided with is located between.
- FIG. 2 is a cross-sectional view taken along the line II of FIG. It is a top view which shows the wiring of the 2nd board
- FIG. 3 is a sectional view taken along line III-III in FIG. It is sectional drawing which shows the principal part of the liquid crystal panel in the 3rd Embodiment of this invention.
- FIG. 10 is a sectional view taken along line IV-IV in FIG. 8. It is a top view which shows the principal part of the liquid crystal panel in the 5th Embodiment of this invention.
- FIG. 11 is a sectional view taken along line VV in FIG. It is sectional drawing which shows an example of the manufacturing method of the liquid crystal display device of this invention. It is sectional drawing which shows an example of the manufacturing method of the liquid crystal display device of this invention. It is sectional drawing which shows an example of the manufacturing method of the liquid crystal display device of this invention. It is sectional drawing which shows an example of the manufacturing method of the liquid crystal display device of this invention. It is sectional drawing which shows an example of the manufacturing method of the liquid crystal display device of this invention. It is sectional drawing which shows an example of the manufacturing method of the liquid crystal display device of this invention.
- FIG. 18 is a cross-sectional view showing a modified example of the manufacturing method shown in FIGS.
- FIG. 18 is a cross-sectional view showing a modified example of the manufacturing method shown in FIGS.
- FIG. 18 is a cross-sectional view showing a modified example of the manufacturing method shown in FIGS.
- FIG. 18 is a cross-sectional view showing a modified example of the manufacturing method shown in FIGS.
- FIG. 18 is a cross-sectional view showing a modified example of the manufacturing method shown in FIGS.
- the liquid crystal display device 1 includes a liquid crystal panel 2, a light source device 3 that emits light toward the liquid crystal panel 2, a first polarizing plate 4 disposed on the liquid crystal panel 2, and the liquid crystal panel 2 and the light source device 3. And a second polarizing plate 5 disposed therebetween.
- the first substrate 21 and the second substrate 22 are disposed to face each other, and a liquid crystal layer 23 is provided between the first substrate 21 and the second substrate 22, so as to surround the liquid crystal layer 23.
- a sealing material 24 for joining the first substrate 21 and the second substrate 22 is provided.
- the first substrate 21 has a first main surface 21A used as a display surface when displaying an image, and a second main surface 21B located on the opposite side of the first main surface 21A.
- the first substrate 21 is formed of a light-transmitting material such as glass or plastic.
- a color filter 211 and a first planarization film 212 are provided on the second main surface 21B of the first substrate 21.
- the color filter 211 has a function of transmitting only a specific wavelength of visible light.
- the plurality of color filters 211 are located on the second main surface 21B of the first substrate 21 and are provided for each pixel P.
- Each color filter 211 has one of red (R), green (G), and blue (B).
- the color filter 211 is not limited to the above color, and for example, a color filter of a color such as yellow (Y) or white (W) may be arranged.
- Examples of the material of the color filter 211 include a resin to which a dye or pigment is added.
- the first planarization film 212 has a function of planarizing the second main surface 21B of the first substrate 21.
- the first planarization film 212 is provided on the color filter 211.
- the first planarization film 212 is formed of an organic material, and examples thereof include an acrylic resin, an epoxy resin, and a polyimide resin.
- the second substrate 22 has a first main surface 22a facing the second main surface 21B of the first substrate 21, and a second main surface 22b located on the opposite side of the first main surface 22a.
- the second substrate 22 can be formed of the same material as the first substrate 21.
- a plurality of gate wirings 221 and auxiliary capacitance wirings 222 are provided, and a gate insulating film 223 is provided so as to cover the plurality of gate wirings 221 and auxiliary capacitance wirings 222. It has been.
- a plurality of source wirings 224 are provided on the gate insulating film 223.
- An interlayer insulating film 225 is provided so as to cover the plurality of source wirings 224.
- a light shielding film BM is provided on the interlayer insulating film 225 and in the formation region of the source wiring 224.
- a shield electrode S is provided on the light shielding film BM.
- a second planarizing film 226 is provided on the interlayer insulating film 225 so as to cover the light shielding film BM, and a common electrode 227 and a signal electrode 228 are provided on the second planarizing film 226. Yes.
- the gate wiring 221 has a function of applying a voltage supplied from a driving IC (not shown) to the thin film transistor TFT. As shown in FIG. 3, the gate wiring 221 extends in the X direction on the first main surface 22 a of the second substrate 22. The plurality of gate wirings 221 are arranged along the Y direction.
- the gate wiring 221 is formed of a conductive material, for example, aluminum, molybdenum, titanium, neodymium, chromium, copper, or an alloy containing these.
- the gate wiring 221 is formed by the following method, for example.
- a metal material is formed as a metal film on the first main surface 22a of the second substrate 22 by sputtering, vapor deposition, or chemical vapor deposition.
- a photosensitive resin is applied to the surface of the metal film, and a pattern having a desired shape is formed on the photosensitive resin by performing exposure processing and development processing on the applied photosensitive resin.
- the metal film is etched with a chemical solution to make the metal film into a desired shape, and then the applied photosensitive resin is peeled off.
- the gate wiring 221 can be formed by forming and patterning a metal material.
- the auxiliary capacitance wiring 222 is provided on the first main surface 22 a of the second substrate 22. Further, the auxiliary capacitance line 222 is opposed to the signal electrode 228 through a plurality of insulating layers. As shown in FIG. 3, the auxiliary capacitance line 222 extends in the X direction on the first main surface 22a. The auxiliary capacitance line 222 is located on the same plane as the gate line 221. The auxiliary capacitance wiring 222 may be formed of the same material as the gate wiring 221.
- the gate insulating film 223 is provided on the first main surface 22 a so as to cover the gate wiring 221.
- the gate insulating film 223 is formed using an insulating material such as silicon nitride or silicon oxide.
- the gate insulating film 223 can be formed on the first main surface 22a of the second substrate 22 by the above-described sputtering method, vapor deposition method, chemical vapor deposition method, or the like.
- the source wiring 224 has a function of applying a signal voltage supplied from the driving IC to the signal electrode 228 via the thin film transistor TFT. As shown in FIG. 3, the plurality of source lines 224 extend in the Y direction. The plurality of source lines 224 are arranged along the X direction on the gate insulating film 223. The source wiring 224 may be formed using the same material as the gate wiring 221. The source wiring 224 can be formed by a method similar to that for the gate wiring 221.
- the thin film transistor TFT includes a semiconductor layer such as amorphous silicon or polysilicon, a source electrode provided on the semiconductor layer, and connected to the source wiring 224, and a drain electrode.
- the drain electrode of the thin film transistor TFT is connected to the signal electrode 228 via the drain wiring D and the contact hole C2.
- the drain wiring D is formed on the gate insulating film 223.
- the drain wiring D is formed of a conductive material, and may be formed of the same material as the source wiring 224.
- the resistance of the semiconductor layer between the source electrode and the drain electrode changes in accordance with the voltage applied to the semiconductor layer through the gate wiring 221, so that writing or non-writing of the image signal to the signal electrode 228 is possible. Be controlled.
- the interlayer insulating film 225 is provided so as to cover the source wiring 224.
- the interlayer insulating film 225 may be formed using a material similar to that of the gate insulating film 223.
- the light shielding film BM has a function of shielding light.
- the light shielding film BM is provided on the interlayer insulating film 225 and is located in a region where the source wiring 224 is formed. Further, the formation region of the source wiring 224 is located in the formation region of the light shielding film BM. In other words, both ends of the source wiring 224 in the width direction are located inside the both ends of the light shielding film BM in the width direction.
- the formation region of the light shielding film BM is a region indicated by oblique lines. Further, the light shielding film BM may be formed not only in the source wiring 224 formation region but also in the gate wiring 221 formation region. Further, the light shielding film BM may be formed so as to overlap the formation region of the auxiliary capacitance wiring 222, the common electrode 227, and the signal electrode 228.
- Examples of the material of the light shielding film BM include a resin to which a dye or pigment having a high light shielding property (for example, black) is added.
- a resin to which a dye or pigment having a high light shielding property for example, black
- the thickness of the light shielding film BM can be secured.
- the shield electrode S on the light shielding film BM the distance between the source wiring 224 and the shield electrode S can be separated, and the capacitance generated between the source wiring 224 and the shield electrode S is reduced, and the shield The load applied to the source wiring 224 by the electrode S can be reduced.
- the thickness of the light shielding film BM is preferably as thick as possible from the viewpoint of optical density and capacity reduction. However, in consideration of flatness, it is preferably set in the range of 0.5 ⁇ m to 2 ⁇ m.
- the shield electrode S has a function of shielding an electric field generated from a voltage applied to the source wiring 224.
- the shield electrode S is provided on the light shielding film BM so as to cover the source wiring 224.
- the shield electrode S in the plan view is indicated by a thick chain line.
- a part S1 of the shield electrode S is a portion located in the inclined portion of the light shielding film BM, and is located between the source wiring 224 and the signal electrode 228 in plan view.
- a part S2 of the shield electrode S is a portion located on the flat portion of the light shielding film BM, and is located so as to overlap the source wiring 224 in plan view.
- the formation region of the shield electrode S is located in the formation region of the common electrode 227. In a horizontal electric field type liquid crystal display device, liquid crystal molecules located on the common electrode 227 are difficult to control, and the formation region of the common electrode 227 is a region that hardly contributes to display. Therefore, by making the formation region of the shield electrode S within the formation region of the common electrode 227, a decrease in the aperture ratio of the pixel P due to the shield electrode S can be suppressed.
- the shield electrode S of the present embodiment is connected to the auxiliary capacitance wiring 222 by the contact hole C1.
- the contact hole C1 is positioned so as to overlap the auxiliary capacitance wiring 222 and the common electrode 227.
- the shield electrode S may be connected to the ground potential.
- the shield electrode S may be floating as long as its surface area can be secured.
- the material of the shield electrode S is formed of a conductive material, for example, ITO (Indium Tin Oxide), IZO (Indium Zinc Oxide), ATO (Antimony Tin Oxide), AZO (Al-Doped Zinc Oxide), tin oxide, It is formed of zinc oxide, aluminum, molybdenum, titanium, neodymium, chromium, copper, or an alloy containing these.
- ITO Indium Tin Oxide
- IZO Indium Zinc Oxide
- ATO Antimony Tin Oxide
- AZO Al-Doped Zinc Oxide
- tin oxide It is formed of zinc oxide, aluminum, molybdenum, titanium, neodymium, chromium, copper, or an alloy containing these.
- the second planarization film 226 has a function of planarizing the first main surface 22a of the second substrate 22. You may form with the material similar to the 1st planarization film
- the film thickness of the second planarizing film 226 is set in the range of 1 ⁇ m to 5 ⁇ m, for example, but is preferably set to 2 ⁇ m or less.
- the common electrode 227 has a function of generating an electric field with the signal electrode 228 by a voltage applied from the driving IC.
- the common electrode 227 is provided on the second planarization film 226.
- the common electrode 227 is formed of a material having translucency and conductivity, and is formed of, for example, ITO, IZO, ATO, AZO, tin oxide, zinc oxide, or a conductive polymer.
- the signal electrode 228 has a function of generating an electric field with the common electrode 227 by a voltage applied from the driving IC.
- the plurality of signal electrodes 228 are provided on the second planarization film 226 and are located for each pixel P. Further, common electrodes 227 are located on both sides of the signal electrode 228. That is, the signal electrodes 228 and the common electrodes 227 are alternately positioned in the X direction.
- the width of the signal electrode 228 is set in the range of 2 ⁇ m to 5 ⁇ m, for example.
- the distance from the common electrode 227 is set in the range of 5 ⁇ m to 20 ⁇ m, for example.
- the signal electrode 228 may be formed of the same material as the common electrode 227.
- an electric field is generated between the signal electrode 228 and the common electrode 227 by applying a voltage to the signal electrode 228 and the common electrode 227 provided on the same plane.
- the direction of liquid crystal molecules in the liquid crystal layer 23 is controlled.
- the shield electrode S since the shield electrode S is located between the source line 224 and the signal electrode 228, the shield electrode S shields the electric field generated from the source line 224, and a signal due to fluctuations in the voltage of the source line 224. The influence on the voltage of the electrode 228 can be reduced. In addition, since the shield electrode S is located in the formation region of the light shielding film BM, the light shielding by the shield electrode S is reduced, and a decrease in luminance of the liquid crystal display device 1 can be suppressed.
- the liquid crystal layer 23 is provided between the first substrate 21 and the second substrate 22.
- the liquid crystal layer 23 includes nematic liquid crystal or the like.
- the sealing material 24 has a function of bonding the first substrate 21 and the second substrate 22 together.
- the sealing material 24 is provided between the first substrate 21 and the second substrate 22.
- an epoxy resin or the like is used for the sealing material 24.
- the light source device 3 has a function of emitting light toward the liquid crystal panel 2.
- the light source device 3 includes a light source 31 and a light guide plate 32.
- a point light source such as an LED is employed as the light source 31, but a linear light source such as a cold cathode tube may be employed.
- the first polarizing plate 4 has a function of selectively transmitting light in a predetermined vibration direction.
- the first polarizing plate 4 is disposed so as to face the first main surface 21A of the first substrate 21 of the liquid crystal panel 2.
- the second polarizing plate 5 has a function of selectively transmitting light in a predetermined vibration direction.
- the second polarizing plate 5 is disposed so as to face the second main surface 22 b of the second substrate 22.
- FIGSecond Embodiment 5 and 6 are views showing the main part of the liquid crystal display device 1A in the second embodiment.
- the liquid crystal display device 1A is different from the liquid crystal display device 1 in that a part S3 of the shield electrode S overlaps the drain wiring D.
- the drain wiring D extends to the central portion of the signal electrode 228 and is connected to the signal electrode 228 via a contact hole C2 located at the central portion of the signal electrode 228. Further, a part of the drain wiring D is arranged so as to overlap the auxiliary capacitance wiring 222. Thereby, an auxiliary capacitance can be formed between the drain wiring D (signal electrode 228) and the auxiliary capacitance wiring 222.
- the shield electrode S has an extending part S3 extending to the signal electrode 228 side, and the extending part S3 is located on the second interlayer insulating film 227. Further, the extending portion S3 of the shield electrode S overlaps with the drain wiring D. Since the extended portion S3 of the shield electrode S and the drain wiring D overlap, an auxiliary capacitance can be formed between the shield electrode S and the drain wiring D. That is, an auxiliary capacitance can be formed between the signal electrode 228 and the shield electrode S in addition to the auxiliary capacitance between the signal electrode 228 and the auxiliary capacitance wiring 222.
- the auxiliary capacitance between the signal electrode 228 and the auxiliary capacitance wiring 222 can be reduced, and the overlapping area between the signal electrode 228 and the auxiliary capacitance wiring 222 can be further reduced, so that the area of the auxiliary capacitance wiring 222 can be reduced. Accordingly, it is possible to suppress a decrease in the aperture ratio of the pixel P due to the auxiliary capacitance wiring 222.
- the extended portion S3 of the shield electrode S is located in the formation region of the auxiliary capacitance wiring 222, it is possible to suppress the aperture ratio of the pixel P from being reduced by the extended portion S3 of the shield electrode S.
- FIG. 7 is a diagram illustrating a main part of the liquid crystal display device 1B according to the third embodiment.
- the liquid crystal display device 1B is different from the liquid crystal display device 1 in that the shield electrode S is connected to the common electrode 227.
- the shield electrode S is connected to the common electrode 227 via the contact hole C3.
- the shield electrode S and the common electrode 227 have the same potential, and the influence of the electric field generated by the voltage applied to the shield electrode S on the voltage of the common electrode 227 can be reduced.
- the contact hole C3 is located in the formation region of the light shielding film BM. Positioning the contact hole C3 so as to overlap the light shielding film BM can reduce the decrease in the aperture ratio of the pixel P due to the contact hole C3.
- FIGS. 8 and 9 are diagrams showing the main part of the liquid crystal display device 1C according to the fourth embodiment.
- the liquid crystal display device 1C is different from the liquid crystal display device 1 in that an opening SH is formed in the shield electrode S.
- the opening SH of the shield electrode S is located in the region where the source wiring 224 is formed. That is, the opening SH of the shield electrode S is formed so as to overlap with the source wiring 224 in plan view.
- the facing area between the shield electrode S and the source wiring 224 is reduced.
- the capacitance generated between the shield electrode S and the source wiring 224 can be reduced, and the load applied to the source wiring 224 by the shield electrode S can be reduced.
- the opening SH is formed in the shield electrode S in order to reduce the capacitance between the shield electrode S and the source line 224, but the common electrode 227 is disposed on the shield electrode S. Therefore, the influence of the electric field of the source wiring 224 on the signal electrode 228 due to the formation of the opening SH is reduced.
- the opening SH is preferably provided in the region where the source wiring 224 is formed. Thereby, the fall of the electric field shielding effect of the shield electrode S by forming opening part SH can be suppressed.
- opening part SH of this embodiment has comprised the rectangular shape, it is not restricted to this.
- FIG. 10 and FIG. 11 are diagrams showing the main part of the liquid crystal display device 1D in the fifth embodiment.
- FIG. 11 is a sectional view taken along line VV in FIG.
- the liquid crystal display device 1D is different from the liquid crystal display device 1 in the following points.
- the drain wiring D extends from one end side of the signal electrode 228 to the other end side.
- the light shielding film BM is formed on the interlayer insulating film 225, and is disposed so as to overlap the gate wiring 221, the auxiliary capacitance wiring 222, the drain wiring D, the common electrode 227, and the signal electrode 228 in plan view.
- a conductive film G is formed on the light shielding film BM and in a region overlapping with the signal electrode 228. The conductive film G is electrically connected to the signal electrode 228. Note that a region indicated by hatching in FIG. 10 means a formation region of the light shielding film BM.
- the light shielding film BM is formed so as to cover the drain wiring D, it is possible to suppress a decrease in contrast of the image display caused by the light reflected by the drain wiring D.
- FIGS. 12 to 17 are cross-sectional views corresponding to line VI-VI in FIG. 10, and the state of the cross section will be described below.
- the gate insulating film 223, the drain wiring D, the source wiring 224, the interlayer insulating film 225, and the like are formed on the first main surface 22a of the second substrate 22 by a known film forming process, patterning process, and the like.
- a light shielding film BM is formed.
- a conductor layer 100 made of a conductive material is formed on the first main surface 22a of the second substrate 22 on which the above members are formed.
- a resist film RE made of a photosensitive resin is formed on the conductor layer 100 formed on the first main surface 22a of the second substrate 22.
- the resist film RE is exposed and exposed by irradiating the exposure light E from the side opposite to the main surface (first main surface 22a) on which the light shielding film BM and the conductor layer 100 are formed, that is, the second main surface 22b side. .
- the light shielding film BM since the light shielding film BM has high light absorption, the exposure light E is absorbed and blocked by the light shielding film BM. That is, since the light shielding film BM functions as a mask pattern, the resist film RE positioned on the light shielding film BM is not exposed in the above-described back exposure.
- a photomask PH is prepared on the first main surface 22a of the second substrate 22, and additional exposure is performed by irradiating the exposure light E from the first main surface 22a side of the second substrate 22. I do. By this additional exposure, portions other than the region where the shield electrode S and the conductive film G are formed are exposed in the resist film RE located in the formation region of the light shielding film BM.
- the resist film RE exposed by the exposure is removed by development processing.
- the shield electrode S and the conductive film G can be formed in the formation region of the light shielding film BM.
- the conductor layer 100 is formed on the light shielding film BM, and the resist film RE on the conductor layer 100 is exposed by backside exposure, so that the shield electrode S and the conductive film G are formed in the formation region of the light shielding film BM.
- the second planarization film 226, the common electrode 227, the signal electrode 228, and the like are formed on the first main surface 22a of the second substrate 22 by a known film formation process, patterning process, etc., so that a so-called TFT substrate is formed. Can be manufactured.
- a first substrate 21 on which a color filter 211 and a first planarizing film 212 are formed is disposed opposite to the second substrate 22, and a liquid crystal layer 23 is disposed between the first substrate 21 and the second substrate 22.
- a liquid crystal display device as shown in FIG. 17 can be manufactured.
- FIG. 18, FIG. 19, FIG. 20 and FIG. 21 show modifications of the above manufacturing method.
- the second planarizing film 226 is formed on the first main surface 22a of the second substrate 22 by the above manufacturing method. Then, as shown in FIG. 18, a conductor layer 101 made of a conductive material is formed, and a resist film RE is formed thereon. Thereafter, the resist film RE is exposed by irradiating the exposure light E from the second main surface 22b side of the second substrate 22.
- the resist film RE positioned on the light-shielding film BM is not exposed in the above-described back exposure.
- a photomask PH is prepared on the first main surface 22a of the second substrate 22, and additional exposure is performed by irradiating the exposure light E from the first main surface 22a side of the second substrate 22. I do. By this additional exposure, portions other than the region where the signal electrode 228 and the common electrode 227 are formed are exposed in the resist film RE located in the formation region of the light shielding film BM.
- the portion of the resist film RE exposed by the exposure is removed by a development process, and the conductor layer 101 exposed from the resist film RE is etched by a chemical solution. Then, by removing the remaining resist film RE, the common electrode 227 and the signal electrode 228 can be formed as shown in FIG.
- the conductive layer 101 is formed on the light shielding film BM, and the resist film RE on the conductive layer 101 is exposed by the back surface exposure.
- the common electrode 227 and the signal electrode 228 can be formed with high positional accuracy in the formation region, and the common electrode 227 and the signal electrode 228 can be easily positioned in the formation region of the light shielding film BM. That is, the occurrence of misalignment can be suppressed in the relationship between the light shielding film BM, the shield electrode S, and the common electrode 227 due to manufacturing variations, and the positional misalignment in the relationship between the light shielding film BM, the conductive film G, and the signal electrode 228 due to manufacturing variations. Generation can be suppressed.
- the present invention is not particularly limited to the above-described first to fifth embodiments, and various modifications and improvements can be made within the scope of the present invention.
- the shield electrode S is provided on the light shielding film 226.
- the shield electrode S may be provided between the light shielding film BM and the source wiring 224 as shown in FIG. Even with such a configuration, it is possible to suppress the influence on the signal electrode 228 due to the fluctuation of the voltage of the source wiring 224 and to suppress the decrease in luminance due to the shield electrode S.
- Liquid crystal display device Liquid crystal panel P Pixel 21 First substrate 21A First main surface 21B Second main surface (main surface) 211 Color filter 212 First planarization film 22 Second substrate 22a First main surface (main surface) 22b Second main surface 221 Gate wiring 222 Auxiliary capacitance wiring 223 Gate insulating film 224 Source wiring 225 Interlayer insulating film 226 Second planarizing film (first insulating film) 227 Common electrode 228 Signal electrode BM Shielding film S Shield electrode SH Opening D Drain wiring C1C2, C3 Contact hole 23 Liquid crystal layer 3 Light source device 31 Light source 32 Light guide plate 4 First polarizing plate 5 Second polarizing plate RE Resist film 100,101 Conductor layer E Exposure light
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Abstract
Description
[第1の実施形態]
本発明の第1の実施形態における液晶表示装置1について、図1~図4を参照しながら説明する。
図5および図6は、第2の実施形態における液晶表示装置1Aの要部を示す図である。
図7は、第3の実施形態における液晶表示装置1Bの要部を示す図である。
図8および図9は、第4の実施形態における液晶表示装置1Cの要部を示す図である。
図10および図11は、第5の実施形態における液晶表示装置1Dの要部を示す図である。図11は、図10のV-V線に沿った断面図である。液晶表示装置1Dは、液晶表示装置1に比べて下記の点で異なる。
本発明の液晶表示装置の製造方法の一例について、図12~図17を参照しながら説明する。なお、図12~図17は図10のVI-VI線に対応した断面図であり、下記では当該断面の状態について説明する。
2 液晶パネル
P 画素
21 第1基板
21A 第1主面
21B 第2主面(主面)
211 カラーフィルタ
212 第1平坦化膜
22 第2基板
22a 第1主面(主面)
22b 第2主面
221 ゲート配線
222 補助容量配線
223 ゲート絶縁膜
224 ソース配線
225 層間絶縁膜
226 第2平坦化膜(第1絶縁膜)
227 共通電極
228 信号電極
BM 遮光膜
S シールド電極
SH 開口部
D ドレイン配線
C1C2,C3 コンタクトホール
23 液晶層
3 光源装置
31 光源
32 導光板
4 第1偏光板
5 第2偏光板
RE レジスト膜
100,101 導体層
E 露光光
Claims (9)
- 主面同士を対向させて配置された第1基板および第2基板と、前記第1基板および前記第2基板との間に配置された液晶層と、前記第2基板の前記主面上に設けられた複数のゲート配線と、複数の前記ゲート配線に交差するように配置された複数のソース配線と、前記ソース配線を覆うように設けられた遮光膜と、複数の前記ゲート配線、複数の前記ソース配線および前記遮光膜を覆うように設けられた第1絶縁膜と、前記第1絶縁膜上に設けられた信号電極と、前記第1絶縁膜上に前記信号電極に重ならないように設けられた、前記信号電極との間で電界を形成するための共通電極とを備え、
複数の前記ゲート配線および複数の前記ソース配線によって囲まれた領域に位置する前記信号電極と前記ソース配線との間に位置するとともに前記遮光膜に重なるようにシールド電極が設けられていることを特徴とする液晶表示装置。 - 前記シールド電極は前記遮光膜上に設けられている請求項1に記載の液晶表示装置。
- 前記シールド電極の形成領域は前記共通電極の形成領域内に位置している請求項1または2に記載の液晶表示装置。
- 前記第2基板の前記主面上には、前記第1絶縁膜を介して前記信号電極と対向するように補助容量配線が設けられており、
前記シールド電極は前記補助容量配線と接続されている請求項1~3のいずれかに記載の液晶表示装置。 - 前記第2基板の前記主面上には、前記信号電極に接続されたドレイン配線が設けられており、
前記シールド電極の一部は第2絶縁膜を介して前記ドレイン配線と重なっている請求項1~4のいずれかに記載の液晶表示装置。 - 前記シールド電極は前記共通電極に接続されている請求項1~5のいずれかに記載の液晶表示装置。
- 前記シールド電極はコンタクトホールを介して前記共通電極に接続されており、
前記コンタクトホールは前記遮光膜に重なるように位置している請求項6に記載の液晶表示装置。 - 前記シールド電極は開口部を有しており、前記シールド電極の前記開口部は前記ソース配線と重なるように設けられている請求項1~7のいずれかに記載の液晶表示装置。
- 主面同士を対向させて配置された第1基板および第2基板と、前記第1基板および前記第2基板との間に配置された液晶層と、前記第2基板の前記主面上に設けられた複数のゲート配線と、複数の前記ゲート配線に交差するように配置された複数のソース配線と、前記ソース配線を覆うように設けられた遮光膜と、複数の前記ゲート配線、複数の前記ソース配線および前記遮光膜を覆うように設けられた第1絶縁膜と、前記第1絶縁膜上に設けられた信号電極と、前記第1絶縁膜上に前記信号電極に重ならないように設けられた、前記信号電極との間で電界を形成するための共通電極と、複数の前記ゲート配線および複数の前記ソース配線によって囲まれた領域に位置する前記信号電極と前記ソース配線との間に位置するとともに前記遮光膜上に設けられたシールド電極とを備える液晶表示装置の製造方法において、
前記第2基板の前記主面上に複数の前記ソース配線を形成する工程と、
前記第2基板の前記主面上に前記ソース配線を覆うように前記遮光膜を形成する工程と、
前記遮光膜が形成された前記第2基板の前記主面上に透光性の導電性材料からなる導体層を形成する工程と、
前記導体層上に感光性材料からなるレジスト膜を形成する工程と、
前記基板の前記主面とは反対側に位置する反対主面側から前記レジスト膜を露光する工程と、
前記レジスト膜の露光された部分を除去して前記導体層の一部を露出させる工程と、
前記導体層の露出させた前記一部を除去することによって、前記遮光膜上に前記シールド電極を形成する工程とを含む液晶表示装置の製造方法。
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CN201280022205.9A CN103534643B (zh) | 2011-05-30 | 2012-05-22 | 液晶显示装置以及其制造方法 |
JP2013517981A JP5627774B2 (ja) | 2011-05-30 | 2012-05-22 | 液晶表示装置およびその製造方法 |
EP12793117.8A EP2717092B1 (en) | 2011-05-30 | 2012-05-22 | Liquid crystal display device and method for manufacturing same |
US14/116,485 US9541805B2 (en) | 2011-05-30 | 2012-05-22 | Liquid crystal display device including shield electrodes and light shielding films and method of manufacturing the same |
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JP2015114669A (ja) * | 2013-12-09 | 2015-06-22 | 三星ディスプレイ株式會社Samsung Display Co.,Ltd. | 液晶表示装置 |
JP2015206830A (ja) * | 2014-04-17 | 2015-11-19 | 株式会社ジャパンディスプレイ | 表示装置 |
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