US20160291360A1 - Method of applying alignment film, and color filter substrate - Google Patents

Method of applying alignment film, and color filter substrate Download PDF

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Publication number
US20160291360A1
US20160291360A1 US15/078,089 US201615078089A US2016291360A1 US 20160291360 A1 US20160291360 A1 US 20160291360A1 US 201615078089 A US201615078089 A US 201615078089A US 2016291360 A1 US2016291360 A1 US 2016291360A1
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United States
Prior art keywords
alignment film
substrate
region
wettability
liquid crystal
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Abandoned
Application number
US15/078,089
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English (en)
Inventor
Kenichi Minowa
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mitsubishi Electric Corp
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Mitsubishi Electric Corp
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Filing date
Publication date
Application filed by Mitsubishi Electric Corp filed Critical Mitsubishi Electric Corp
Assigned to MITSUBISHI ELECTRIC CORPORATION reassignment MITSUBISHI ELECTRIC CORPORATION ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: MINOWA, KENICHI
Publication of US20160291360A1 publication Critical patent/US20160291360A1/en
Priority to US16/906,303 priority Critical patent/US11067854B2/en
Abandoned legal-status Critical Current

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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
    • G02F1/1337—Surface-induced orientation of the liquid crystal molecules, e.g. by alignment layers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D1/00—Processes for applying liquids or other fluent materials
    • B05D1/28—Processes for applying liquids or other fluent materials performed by transfer from the surfaces of elements carrying the liquid or other fluent material, e.g. brushes, pads, rollers
    • B05D1/286—Processes for applying liquids or other fluent materials performed by transfer from the surfaces of elements carrying the liquid or other fluent material, e.g. brushes, pads, rollers using a temporary backing to which the coating has been applied
    • 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
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/133509—Filters, e.g. light shielding masks
    • G02F1/133514—Colour filters
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K2323/00—Functional layers of liquid crystal optical display excluding electroactive liquid crystal layer characterised by chemical composition
    • C09K2323/06—Substrate layer characterised by chemical composition

Definitions

  • the present invention relates to a method of applying an alignment film on a glass substrate constituting a liquid crystal panel and a color filter substrate using thereof.
  • a flat panel display such as a liquid crystal panel
  • the FPD has been widely used in many fields such as a television, a car navigation apparatus and a computer.
  • the size and definition of the panel have increased yearly, various shapes or sizes of the panel are required according to usage thereof.
  • a response to the small lot production of many products of a liquid crystal panel is essentially required.
  • the liquid crystal panel has a pair of substrates facing each other, a spacer for holding uniformly the substrates and liquid crystal filled between the substrates.
  • One substrate is referred to as an active matrix type substrate on which a thin film transistor (TFT) is formed (hereinafter, referred to as a TFT substrate) and a counter substrate is referred to as a color filter substrate (hereinafter, referred to as a CF substrate).
  • TFT thin film transistor
  • CF substrate color filter substrate
  • a shield region is formed at the counter CF substrate to suppress transmission of light, thereby obtain beautiful display.
  • liquid crystal panel it is necessary to uniformly arrange liquid crystal molecules in a light transmission region. By applying a voltage to the liquid crystal molecules, the arrangement direction of the liquid crystal molecules is changed, thereby controlling the direction of passage of light.
  • An alignment film is uniformly applied on the surfaces of the TFT substrate and the CF substrate, and a process of rubbing the surfaces using rubbing cloth needs to be performed.
  • the method of applying the alignment film includes, for example, a method of an alignment film from nozzles (JP-A-2004-148309) and a printing method using a transfer plate (JP-A-11-92659 and JP-A-2003-5186).
  • a method of an alignment film from nozzles JP-A-2004-148309
  • a printing method using a transfer plate JP-A-11-92659 and JP-A-2003-5186.
  • various plates are not required for each product type, but irregularities in spraying from nozzles are apt to occur, so that it is difficult to control uniformity of the film thickness.
  • nonuniformity of the thickness of the alignment film is critical.
  • the printing method it is easy to make the film thickness uniform, but when various kinds of products are manufactured, each patterned transfer plate is required for each product (see paragraph 0004 of JP-A-11-92659 or paragraph 0031 of JP-A-2003-5186).
  • the alignment film In the process of transferring the alignment film, when the alignment film is applied on the glass substrate of the liquid crystal panel, the alignment film needs to be selectively applied according to a region, in which an alignment film is applied and which is mainly a display region, and a region, in which an alignment film is not applied and which is a peripheral portion of the display region.
  • the region, in which the alignment film is not applied is a region, in which a peripheral seal material or mounting member of the liquid crystal panel is attached at a higher layer, or a region, in which an inspection terminal onto which a needle is brought into contact upon inspection is located.
  • each transfer plate for selectively applying the alignment film in the region in which the alignment film is applied and the region, in which the alignment film is not applied is required for each product type when various types of products are manufactured.
  • the thickness of the alignment film is uniformly formed. Further, manufacture or management of a transfer plate in a process of transferring an alignment film is simplified, and loss of a production time due to a step-up replacement operation by changing of the type of the product is reduced.
  • the method includes: forming a surface having high wettability and a surface having low wettability, with respect to a material of the alignment film; bringing uniformly the material of the alignment film into contact with the surface having high wettability and the surface having low wettability when the material of the alignment film on the substrate is applied by using a transfer plate; and separating the transfer plate and the surface of the substrate such that the material of the alignment film is left on the surface having high wettability and the material of the alignment film is not left on the surface having low wettability.
  • a substrate for a liquid crystal panel includes a surface, on which a material of an alignment film is applied, the surface of the substrate has a region having high wettability and a region having low wettability, with respect to a material of the alignment film, and the region having high wettability corresponds to a display region of the liquid crystal panel and the region having low wettability corresponds to a peripheral region of the display region.
  • a plurality of types of transfer plates becomes unnecessary and management costs decrease.
  • productivity is improved.
  • FIG. 1 is a schematic plan view of a CF substrate according to Embodiment 1 of the present invention.
  • FIG. 2 is a schematic cross-sectional view of FIG. 1 ;
  • FIG. 3 is a schematic plan view showing an alignment film transfer plate according to Embodiments 1 and 2 of the present invention.
  • FIG. 4 is a schematic view of a state of applying an alignment film according to Embodiments 1 and 2 of the present invention.
  • FIG. 5 is a schematic cross-sectional view of a CF substrate according to Embodiment 2 of the present invention.
  • FIG. 1 is a schematic plan view of a CF substrate which is one substrate of a pair of substrates facing each other, of a liquid crystal panel.
  • a TFT substrate which is another substrate, using a general TN liquid crystal mode is employed as a TFT substrate, the TFT substrate will not be specially described.
  • FIG. 2 is a schematic cross-sectional view of FIG. 1 , in which the liquid crystal panel has a cross-sectional structure corresponding to the TN liquid mode.
  • FIG. 3 is a schematic plan view showing an alignment film transfer plate used in the present invention
  • FIG. 4 is a schematic view of a state of applying an alignment film in the present invention.
  • the CF substrate 1 is manufactured such that a surface thereof includes a region 2 having low wettability and a region 3 having high wettability. That is, in the present embodiment, when the surface of the CF substrate 1 is formed, the region 2 having low wettability corresponds to a region, in which an alignment film is not applied, and the region 3 having high wettability corresponds to a region, in which the alignment film is applied.
  • the “wettability” of the surface of the substrate described herein means the high/low level (good/bad) of wettability with respect to the material of the alignment film.
  • FIG. 2 is a cross-sectional view taken along a dotted line A-A of FIG. 1 .
  • a shield region 5 of a light shielding layer, a color material 6 of a transmission layer and a conductive film 7 are sequentially laminated on the glass substrate 4 from a lower layer thereof.
  • the conductive film 7 of a display region needs to be a transparent film having high wettability, and an ITO film or an IGZO film may be used as a counter electrode material constituting a pixel.
  • an organic film 8 having low wettability is formed on the glass substrate 4 .
  • the surface of the organic film 8 needs to have an oil repelling property for repelling the alignment film, and the surface 9 of the organic film 8 has fine irregularities.
  • organic fluoride or acrylic resin of photocurable resin, polyimide resin or the like may be used.
  • the transfer plate 10 used to apply the alignment film is composed of a transfer-plate convex portion 12 for applying an alignment film material on a transfer-plate base 11 .
  • a transfer-plate convex portion 12 for applying an alignment film material on a transfer-plate base 11 .
  • the transfer-plate convex portion 12 has no concave portion for distinguishing between a region in which the alignment film 13 is attached and a region in which the alignment film is not attached and has a uniform solid pattern.
  • the material 16 of the alignment film is dropped from an alignment-film supplying nozzle 15 and attached to the surface of the transfer-plate convex portion 12 of the transfer plate 10 attached to a transfer device body 14 .
  • a stage (not shown), on which the CF substrate 1 is hold, moves in a direction denoted by a white arrow in synchronization with rotation of the transfer device body 14 in a direction denoted by a black arrow, and the transfer-plate convex portion 12 is sequentially brought into contact with the CF substrate from the end of the CF substrate 1 , thereby performing a transfer operation.
  • the region 2 having low wettability and the region 3 having high wettability exist on the surface of the CF substrate 1 .
  • the material 16 of the alignment film contacted to the transfer-plate convex portion 12 is brought into contact with both of the region 2 having low wettability and the region 3 having high wettability.
  • the material 16 of the alignment film is selectively attached to only the region 3 due to a difference in wettability.
  • the material 16 of the alignment film brought into contact with the region 2 having low wettability is left on the transfer-plate convex portion 12 without being attached to the CF substrate 1 .
  • the transfer-plate convex portion 12 and the CF substrate 1 are shown as being separated from each other at a predetermined distance in FIG. 4 , this is exaggerated in order to easily distinguish between the region 2 having low wettability and the region 3 having high wettability.
  • the transfer-plate convex portion and the CF substrate are in contact with each other with interposing the material 16 of the alignment film.
  • the material 16 of the alignment film left on the CF substrate 1 becomes the alignment film 13 via general subsequent processes such as dry, firing or the like and the alignment film is selectively formed on the CF substrate 1 .
  • the TFT substrate which is one substrate, using a general IPS liquid crystal mode is employed as the TFT substrate, a description thereof will be omitted.
  • the plan view ( FIG. 1 ) of CF substrate 1 , the alignment film transfer plate ( FIG. 3 ), the alignment film applying process ( FIG. 4 ) or the like are equal to those of Embodiment 1 and thus a detailed description thereof will be omitted.
  • FIG. 5 is a schematic cross-sectional view of the CF substrate, in which the cross-sectional structure corresponding to the IPS liquid crystal mode is shown and no counter electrode exists in a pixel portion.
  • FIG. 5 is a cross-sectional view taken along with a dotted line A-A of FIG. 1 similarly to the above-described embodiment.
  • a shield region 5 of a light shielding layer, a color material 6 of a transmission layer and an organic film 17 having high wettability are sequentially laminated on the glass substrate 4 from a lower layer thereof.
  • the organic film 17 having high wettability is mainly formed in the display region and needs to be a transparent film.
  • thermosetting type acrylic resin or polyimide resin is preferable.
  • an organic film 8 having low wettability is formed on the glass substrate 4 .
  • the surface 9 of the organic film 8 needs to have an oil repelling property for repelling the material 16 of the alignment film and thus the surface 9 of the organic film has fine irregularities.
  • organic fluoride or acrylic resin of photocurable resin, polyimide resin or the like may be used.
  • wettability of the material used for the organic film 8 is not specially problematic and wettability of the surface 9 is preferably low.
  • surface treatment such as fluorine processing or irregularities such as fine projections are formed in the surface such as a nanotube to realize the surface 9 of the organic film having low wettability.
  • the CF substrate which is one of a pair of substrates facing each other and constituting the liquid crystal panel
  • the example of dividing the glass substrate into regions having different wettability and selectively applying the alignment film is described in Embodiment 1 or 2.
  • the substrate divided into the regions may not be a CF substrate and the TFT substrate which is another substrate of the liquid crystal panel may be divided.

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  • Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • Mathematical Physics (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Liquid Crystal (AREA)
  • Optical Filters (AREA)
US15/078,089 2015-04-06 2016-03-23 Method of applying alignment film, and color filter substrate Abandoned US20160291360A1 (en)

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Application Number Priority Date Filing Date Title
US16/906,303 US11067854B2 (en) 2015-04-06 2020-06-19 Method of applying alignment film, and color filter substrate

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JP2015-077368 2015-04-06
JP2015077368A JP6528517B2 (ja) 2015-04-06 2015-04-06 配向膜の塗布方法

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107329326A (zh) * 2017-07-27 2017-11-07 武汉华星光电技术有限公司 转印版及转印装置
WO2021159597A1 (zh) * 2020-02-12 2021-08-19 武汉华星光电技术有限公司 配向膜转印版以及配向膜制造方法

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP6528517B2 (ja) * 2015-04-06 2019-06-12 三菱電機株式会社 配向膜の塗布方法

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CN107329326A (zh) * 2017-07-27 2017-11-07 武汉华星光电技术有限公司 转印版及转印装置
WO2021159597A1 (zh) * 2020-02-12 2021-08-19 武汉华星光电技术有限公司 配向膜转印版以及配向膜制造方法
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US20200319486A1 (en) 2020-10-08
JP6528517B2 (ja) 2019-06-12
JP2016197190A (ja) 2016-11-24
US11067854B2 (en) 2021-07-20

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