WO2012070412A1 - 液晶表示素子の製造方法および液晶表示素子の製造システム - Google Patents
液晶表示素子の製造方法および液晶表示素子の製造システム Download PDFInfo
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- WO2012070412A1 WO2012070412A1 PCT/JP2011/076090 JP2011076090W WO2012070412A1 WO 2012070412 A1 WO2012070412 A1 WO 2012070412A1 JP 2011076090 W JP2011076090 W JP 2011076090W WO 2012070412 A1 WO2012070412 A1 WO 2012070412A1
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- sheet piece
- film
- liquid crystal
- crystal panel
- laminating
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/30—Polarising elements
- G02B5/3025—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state
- G02B5/3033—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state in the form of a thin sheet or foil, e.g. Polaroid
- G02B5/3041—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state in the form of a thin sheet or foil, e.g. Polaroid comprising multiple thin layers, e.g. multilayer stacks
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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
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/30—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers
- B32B27/306—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers comprising vinyl acetate or vinyl alcohol (co)polymers
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/32—Layered products comprising a layer of synthetic resin comprising polyolefins
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/36—Layered products comprising a layer of synthetic resin comprising polyesters
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/30—Polarising elements
-
- 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
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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
- G02F1/1303—Apparatus specially adapted to the manufacture of LCDs
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2307/00—Properties of the layers or laminate
- B32B2307/40—Properties of the layers or laminate having particular optical properties
- B32B2307/416—Reflective
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2307/00—Properties of the layers or laminate
- B32B2307/40—Properties of the layers or laminate having particular optical properties
- B32B2307/42—Polarizing, birefringent, filtering
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2457/00—Electrical equipment
- B32B2457/20—Displays, e.g. liquid crystal displays, plasma displays
- B32B2457/202—LCD, i.e. liquid crystal displays
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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
- G02F1/1306—Details
- G02F1/1309—Repairing; Testing
Definitions
- the present invention relates to a liquid crystal display element manufacturing method and a liquid crystal display element manufacturing system.
- Patent Document 1 describes a method of manufacturing a liquid crystal display element by laminating a plurality of optical films on a liquid crystal panel in order for each optical film. Specifically, the carrier film is fed out from a continuous roll formed by winding a carrier film on which an optical film is laminated, and the optical film is cut into a predetermined size (half cut) in the film width direction while leaving the carrier film. The sheet piece from which the carrier film is peeled off is attached to the liquid crystal panel, and the sheet pieces of the next optical film are sequentially laminated on the optical film laminated on the liquid crystal panel.
- Patent Document 1 since two or more sheet pieces are sequentially laminated on the liquid crystal panel, there is a concern that foreign matter or the like may be caught in the adhesive. If biting of foreign matter or the like occurs, a new sheet piece is further laminated on the liquid crystal panel in the next sheet piece laminating process, and as a result, the yield of the optical film is deteriorated.
- optical films that reduce the inspection accuracy of optical inspection due to their own optical characteristics.
- examples of such an optical film include a brightness enhancement film such as a reflective polarizing film or a retardation film.
- a brightness enhancement film such as a reflective polarizing film or a retardation film.
- the reflective polarizing film tends to lower the inspection accuracy from the characteristics.
- the present invention has been made in view of the above circumstances, and in the case of laminating two or more optical film sheet pieces on a liquid crystal panel, the optical film yield is not lowered and optical inspection (for example, The present invention provides a method for manufacturing a liquid crystal display element and a system for manufacturing a liquid crystal display element so as not to lower the inspection accuracy of inspection using reflected light and inspection using transmitted light.
- the present invention includes a carrier film transport sub-step for transporting the carrier film from a continuous roll formed by winding a carrier film on which an optical film having a predetermined film width including an adhesive is laminated, and optically leaving the carrier film.
- a liquid crystal display element comprising two or more sheet piece laminating steps of an optical film including a pasting substep of laminating the sheet piece peeled from the carrier film on the liquid crystal panel side through the adhesive while being conveyed.
- a manufacturing method comprising: A first sheet piece laminating step of laminating a sheet piece of an optical film on the first surface of the liquid crystal panel; A second sheet piece laminating step of laminating a sheet piece of an optical film on the second surface of the liquid crystal panel; An inspection step for optically inspecting the liquid crystal panel in which the sheet pieces of the optical film are formed on both sides; And a third sheet piece laminating step of laminating the optical film sheet piece on the optical film sheet piece laminated on the first surface or the second surface after the inspection step.
- the liquid crystal panel can be optically inspected, and for example, another optical film sheet piece can be laminated on a non-defective (normal) liquid crystal panel. Therefore, the yield of the optical film can be prevented from decreasing.
- the first sheet piece laminating step, the second sheet piece laminating step, the inspection step, and the third sheet piece laminating step are successively performed.
- a liquid crystal display element in which sheet pieces of optical film are laminated on both sides of the liquid crystal panel (two sheet pieces are laminated on one side of the liquid crystal panel) can be continuously manufactured, so that productivity can be improved.
- the inspection step and the third sheet piece lamination step may be continuously performed.
- the third sheet piece laminating step may be performed.
- the inspection step inspects defects based on a reflected light image obtained by irradiating light to a liquid crystal panel in which sheet pieces of an optical film are formed on both sides,
- the sheet piece of the optical film laminated after the inspection step has a characteristic of reducing the inspection accuracy by the inspection step.
- a brightness enhancement film such as a reflective polarizing film is exemplified.
- optical inspection can be performed without reducing inspection accuracy, and sheet pieces of an optical film that reduce inspection accuracy can be stacked after inspection.
- the first and second sheet piece laminating steps are polarizing film sheet piece laminating steps for laminating a two-color polarizing film sheet piece on a liquid crystal panel
- the third sheet piece laminating step one of the sheet pieces of the two-color polarizing film laminated on the first surface or the second surface, the direction of the transmission axis of the sheet piece of the one two-color polarizing film, and the reflected polarization
- it is a sheet
- the liquid crystal panel with the polarizing film laminated on both sides is inspected, and the reflective polarizing film is laminated on the liquid crystal panel judged to be non-defective, and the liquid crystal panel judged to be defective Since it is not necessary to laminate them, the yield of the reflective polarizing film can be increased.
- the sheet piece of the two-color polarizing film having a transmission axis in the longitudinal direction orthogonal to the film width direction is laminated on the liquid crystal panel, and then the reflection.
- the sheet piece laminating step of the polarizing film it is preferable that the sheet piece of the reflective polarizing film having the transmission axis in the longitudinal direction orthogonal to the film width direction is attached to the sheet piece of the two-color polarizing film.
- a two-color polarizing film having a transmission axis in the longitudinal direction (MD direction) and an absorption axis in the film width direction can be used.
- the transmission axis of the two-color polarizing film is in the longitudinal direction (MD direction)
- the transmission axis of the reflective polarizing film is in the longitudinal direction (MD direction)
- the two-color polarizing film, the reflective polarizing film, and the liquid crystal panel Since the conveying direction can be the same, the production line can be a straight line without employing a complicated mechanism such as a rotating mechanism.
- a carrier film conveying means for conveying the carrier film from a continuous roll formed by winding a carrier film on which an optical film having a predetermined film width including an adhesive is laminated, and leaving the carrier film.
- Cutting means for cutting the optical film at a predetermined cutting interval in the film width direction orthogonal to the longitudinal direction of the optical film to form a sheet piece of the optical film, transport means for transporting the liquid crystal panel, and the liquid crystal panel
- a liquid crystal display device comprising two or more sheet piece laminating devices for an optical film comprising a sticking means for laminating the sheet piece peeled from the carrier film on the liquid crystal panel side through the adhesive while being conveyed
- a system A first sheet piece laminating device for laminating optical film sheet pieces on the first surface of the liquid crystal panel; A second sheet piece laminating device for laminating a sheet piece of an optical film on the second surface of the liquid crystal panel;
- An inspection device for optically inspecting the liquid crystal panel in which the sheet pieces of the optical film are
- the liquid crystal panel can be optically inspected, and for example, another optical film sheet piece can be laminated on a non-defective (normal) liquid crystal panel. Therefore, the yield of the optical film can be prevented from decreasing.
- the first sheet piece laminating device, the second sheet piece laminating device, the inspection device, and the third sheet piece laminating device are arranged in a continuous production line.
- a liquid crystal display element in which sheet pieces of optical film are laminated on both sides of the liquid crystal panel (two sheet pieces are laminated on one side of the liquid crystal panel) can be continuously manufactured, so that productivity can be improved.
- the first sheet piece laminating device and the second sheet piece laminating device are arranged on a continuous production line, and the inspection device and the third sheet are arranged on a production line different from the continuous production line.
- a piece laminating apparatus may be arranged, the first sheet piece laminating apparatus, the second sheet piece laminating apparatus and the inspection apparatus are arranged on a continuous production line, and the third sheet piece laminating apparatus is arranged on another production line. May be.
- the inspection apparatus inspects defects based on a reflected light image obtained by irradiating light to a liquid crystal panel in which sheet pieces of an optical film are formed on both sides,
- the sheet piece of the optical film laminated after the inspection by the inspection apparatus has a characteristic of reducing the inspection accuracy by the inspection apparatus.
- a brightness enhancement film such as a reflective polarizing film is exemplified.
- optical inspection can be performed without reducing inspection accuracy, and sheet pieces of an optical film that reduce inspection accuracy can be stacked after inspection.
- the first and second sheet piece laminating devices are polarizing film sheet piece laminating steps for laminating a two-color polarizing film sheet piece on a liquid crystal panel
- the third sheet piece laminating step one of the sheet pieces of the two-color polarizing film laminated on the first surface or the second surface, the direction of the transmission axis of the sheet piece of the one two-color polarizing film, and the reflected polarization
- the reflective polarizing film sheet piece laminating apparatus is to attach the reflective polarizing film sheet piece so that the transmission axis direction of the film sheet piece is the same.
- the liquid crystal panel in which the two-color polarizing film is laminated on both sides is inspected, and the reflective polarizing film is laminated on the liquid crystal panel judged to be non-defective, and the liquid crystal judged defective. Since it is not necessary to laminate it on the panel, the yield of the reflective polarizing film can be increased.
- the polarizing film sheet piece laminating apparatus affixes the reflective polarizing film sheet piece having a transmission axis in the longitudinal direction perpendicular to the film width direction to the two-color polarizing film sheet piece.
- a two-color polarizing film having a transmission axis in the longitudinal direction (MD direction) and an absorption axis in the film width direction can be used.
- the transmission axis of the two-color polarizing film is in the longitudinal direction (MD direction)
- the transmission axis of the reflective polarizing film is in the longitudinal direction (MD direction)
- the two-color polarizing film, the reflective polarizing film, and the liquid crystal panel Since the conveying direction can be the same, the production line can be a straight line without employing a complicated mechanism such as a rotating mechanism.
- An optical film comprising: a transport sub-step for transporting a panel; and a pasting sub-step for laminating the sheet piece peeled from the carrier film on the liquid crystal panel side through the adhesive while transporting the liquid crystal panel
- a method for producing a liquid crystal display element comprising two or more sheet piece lamination steps, A first sheet piece laminating step of laminating a sheet piece of an optical film on the first surface of the liquid crystal panel; A second sheet piece laminating step of laminating a sheet piece of an optical film on the second surface of the liquid crystal panel; An inspection step for optically inspecting the liquid crystal panel in which the sheet pieces of the optical film are formed on both sides; After the inspection step, a third sheet piece laminating step of laminating the optical film sheet piece on the optical film sheet piece laminate
- the cutting sub-step can be omitted.
- a carrier film conveying means for conveying the carrier film from a continuous roll formed by winding a carrier film in which a plurality of sheet pieces of an optical film containing an adhesive are adjacent to each other, and a liquid crystal panel Sheet piece lamination of an optical film comprising conveying means for conveying the sheet piece, and a sticking means for laminating the sheet piece peeled from the carrier film on the liquid crystal panel side via the adhesive while conveying the liquid crystal panel
- a liquid crystal display element manufacturing system comprising two or more devices, A first sheet piece laminating device for laminating optical film sheet pieces on the first surface of the liquid crystal panel; A second sheet piece laminating device for laminating a sheet piece of an optical film on the second surface of the liquid crystal panel; An inspection device for optically inspecting the liquid crystal panel in which the sheet pieces of the optical film are formed on both sides; And a third sheet piece laminating device for laminating the optical film sheet piece on the optical film sheet piece laminated on the first surface or the second surface after the inspection
- a continuous roll (a so-called continuous roll with notches) formed by winding a plurality of laminated optical film sheets adjacent to each other can be used, the installation of the cutting means is omitted or the cutting means is installed. If so, the cutting means can be stopped.
- the sheet piece lamination step further includes a film inspection sub-step for inspecting an optical film
- the cutting sub-step preferably cuts the optical film according to the inspection result of the film inspection sub-step. Inspection means to inspect for defects in the optical film. Moreover, when an optical film is cut
- the said optical film is test
- the cutting sub-step excludes the optical film determined to be defective as a result of the inspection of the film inspection sub-step to be cut into a predetermined size and the sheet piece of the optical film determined to be defective is excluded. It is preferable to further include substeps.
- a sheet piece that is cut into a predetermined size (sometimes referred to as a skip cut) so as to avoid a defective portion of the optical film and includes a defect determined as a defective product is, for example, known It is excluded (removed) by the exclusion device. Thereby, the yield of an optical film improves significantly.
- Flow chart of manufacturing method of liquid crystal display element Flow chart of manufacturing method of liquid crystal display element The figure for demonstrating the manufacturing system of a liquid crystal display element The schematic diagram of the state which laminated
- the optical film only needs to include an adhesive layer as the outermost layer, and may be a single-layer optical film or a laminated optical film in which optical films are laminated. Moreover, the structure by which the other film member was laminated
- the optical film include a polarizer and a polarizing film.
- the polarizing film is formed by laminating a polarizer and a polarizer protective film on both sides or one side thereof. In some cases, a surface protective film for protecting the polarizer or the polarizing film from scratches during transportation is laminated.
- other optical films include optical compensation films such as retardation films and brightness enhancement films.
- a retardation film and / or a brightness enhancement film may be laminated on a polarizer or a polarizing film.
- the polarizing film examples include a two-color polarizing film.
- the two-color polarizing film is (A) a step of drying a polyvinyl alcohol-based film that has been dyed, crosslinked and stretched to obtain a polarizer, and (B) a step of attaching a protective layer to one or both sides of the polarizer, (C) It manufactures by the manufacturing method including the process of heat-processing after bonding. Each treatment of dyeing, crosslinking and stretching of the polyvinyl alcohol film need not be performed separately and may be performed simultaneously, and the order of the treatments may be arbitrary. In addition, you may use the polyvinyl alcohol-type film which gave the swelling process as a polyvinyl-alcohol-type film.
- a polyvinyl alcohol film is immersed in a solution containing iodine or a dichroic dye, dyed by adsorbing iodine or a dichroic dye, washed, and stretched in a solution containing boric acid or borax. After uniaxial stretching at a magnification of 3 to 7 times, it is dried. After stretching in a solution containing iodine or a dichroic dye, further stretching (two-stage stretching) in a solution containing boric acid or borax, and then drying, the orientation of iodine increases, and the degree of polarization This is particularly preferable because the characteristics are improved.
- the brightness enhancement film examples include a reflective polarizing film having a reflection axis and a transmission axis.
- the reflective polarizing film can be obtained, for example, by alternately laminating and stretching a plurality of polymer films A and B of two different materials.
- the refractive index of only material A increases and changes in the stretching direction, birefringence is developed, and the stretching direction having a difference in refractive index at the interface of material AB becomes the reflection axis, and the direction in which no refractive index difference occurs (non-stretching direction). It becomes the transmission axis.
- the pressure-sensitive adhesive contained in the optical film is not particularly limited, and examples thereof include an acrylic pressure-sensitive adhesive, a silicone pressure-sensitive adhesive, and a urethane pressure-sensitive adhesive.
- the carrier film for example, a film such as a plastic film (for example, a polyethylene terephthalate film, a polyolefin film, etc.) can be used. Further, if necessary, an appropriate material such as a silicone-based, long-chain alkyl-based, fluorine-based or molybdenum sulfide-coated material may be used.
- the form in which the optical film is formed on the carrier film is not particularly limited.
- a continuous roll what wound the optical film laminated body which has (1) carrier film and the optical film containing the adhesive formed on the said carrier film in roll shape is mentioned, for example.
- the continuous manufacturing system of the liquid crystal display element leaves the carrier film without being cut and leaves the optical film (including the adhesive) at a predetermined cutting interval.
- a cutting means for cutting half-cut. In this cutting, for example, based on the inspection result of the defect inspection apparatus in the continuous manufacturing system, the cutting may be performed so as to distinguish the non-defective sheet piece from the defective sheet piece.
- a continuous roll for example, (2) a roll of an optical film laminate having a carrier film and a sheet piece of an optical film containing an adhesive formed on the carrier film (so-called notched optics) Continuous roll of film).
- liquid crystal display element In the liquid crystal display element, at least (two-color) polarizing film sheet pieces are formed on one or both sides of a liquid crystal panel, and a drive circuit is incorporated as necessary.
- a liquid crystal panel for example, an arbitrary type such as a vertical alignment (VA) type or an in-plane switching (IPS) type can be used.
- VA vertical alignment
- IPS in-plane switching
- the liquid crystal panel 4 shown in FIG. 1 has a configuration in which a liquid crystal layer is sealed between a pair of substrates (a first substrate and a second substrate) arranged to face each other.
- a liquid crystal display device manufacturing method includes a carrier film transport sub-step for transporting the carrier film from a continuous roll formed by winding a carrier film on which an optical film having a predetermined film width including an adhesive is laminated, and the carrier film.
- the two or more sheet piece lamination steps are, for example, a first sheet piece lamination step, a second sheet piece lamination step, and a third sheet piece lamination step, which will be described later.
- a method for manufacturing a liquid crystal display element includes a first sheet piece laminating step of laminating a sheet piece of an optical film on a first surface (for example, a viewing side) of a liquid crystal panel, and a second surface (for example, a back side) of the liquid crystal panel.
- a second sheet piece laminating step for laminating a sheet piece of the optical film an inspection step for optically inspecting the liquid crystal panel having the sheet piece of the optical film formed on both sides, and a first step after the inspection step,
- stacked on both surfaces of a liquid crystal panel is made into a two-color polarizing film
- stacked on the liquid crystal panel side is made into a reflective polarizing film by affixing on the sheet piece of one two-color polarizing film after an inspection step.
- the two-color polarizing film and reflective polarizing film laminated on the back side of the liquid crystal panel have a transmission axis in the longitudinal direction perpendicular to the film width direction
- the two-color polarizing film laminated on the viewing side of the liquid crystal panel is It demonstrates as what has a transmission axis in a film width direction.
- the first and second sheet piece laminating steps are polarizing film sheet piece laminating steps for laminating the two-color polarizing film sheet pieces on the liquid crystal panel
- the third sheet piece laminating step comprises the first surface or
- the direction of the transmission axis of the sheet piece of the one two-color polarizing film is the same as the direction of the transmission axis of the sheet piece of the reflective polarizing film on one of the sheet pieces of the two-color polarizing film laminated on the second surface
- stacking step are performed continuously.
- FIG. 1 shows a flowchart of an example of a method for manufacturing a liquid crystal display element.
- a sheet piece of a two-color polarizing film is laminated on one surface (for example, the viewing side) of the liquid crystal panel (S1).
- a specific description will be given with reference to FIG.
- a continuous roll of a two-color polarizing film is prepared (S1).
- the two-color polarizing film and the carrier film are fed out from the continuous roll and conveyed to the downstream side (carrier film conveyance substep, S12).
- this conveyance means, for example, a feed roller, a tension roller, a dancer roller, a sensor for detecting a feed amount, a control unit for controlling the feed speed, the feed amount, and the like are configured.
- a sheet piece of the two-color polarizing film is formed by cutting the two-color polarizing film at a predetermined cutting interval in the film width direction orthogonal to the longitudinal direction of the two-color polarizing film, leaving the carrier film (cutting sub-step, S13).
- the cutting means include a laser device and a cutter.
- the sheet of the two-color polarizing film is peeled off from the carrier film by turning back at the leading end of the peeling means with the carrier film facing inward, and supplied to the application position. And while conveying a liquid crystal panel, the sheet piece of the 2 color polarizing film peeled from the carrier film is laminated
- a sticking means for example, a pair of sticking rollers can be mentioned.
- a conveyance substep conveys the liquid crystal panel with which the 2 color polarizing film was affixed to the sticking position with the following reflective polarizing film.
- the transport means of the liquid crystal panel includes, for example, a sticking roller pair, a transport roller, a suction plate, a control unit for controlling the transport speed, the feed amount, and the like.
- a sheet piece of a two-color polarizing film is laminated on the other side (for example, the back side) of the liquid crystal panel (S2).
- the sheet piece of the two-color polarizing film so that the transmission axis of the sheet piece of the two-color polarizing film laminated in step S1 and the transmission axis of the sheet piece of the two-color polarizing film laminated here intersect at 90 °. Is laminated on the other side of the liquid crystal panel. If necessary, the liquid crystal panel may be turned upside down.
- the two-color polarizing film laminated on the viewing side of the liquid crystal panel has a transmission axis in the film width direction
- the two-color polarizing film laminated on the back side of the liquid crystal panel is in the film width direction. Since the liquid crystal panel has a transmission axis in the longitudinal direction orthogonal to the two-color polarizing film, the two-color polarizing film can be laminated on the viewing side and the rear side of the liquid crystal panel without rotating the liquid crystal panel by 90 °.
- a continuous roll of two-color polarizing film is prepared (S11).
- the film width W1 of the two-color polarizing film is preferably larger than the film width W2 of the reflective polarizing film laminated on the two-color polarizing film.
- the two-color polarizing film and the carrier film are fed out from the continuous roll and conveyed to the downstream side (carrier film conveyance substep, S12).
- a sheet piece of the two-color polarizing film is formed by cutting the two-color polarizing film at a predetermined cutting interval L1 in the film width direction orthogonal to the longitudinal direction of the two-color polarizing film while leaving the carrier film (cutting sub-step, S13). ).
- the sheet of the two-color polarizing film is peeled off from the carrier film with the carrier film on the inside and folded at the tip of the peeling means, and supplied to the application position. And while conveying a liquid crystal panel, the sheet piece of the 2 color polarizing film peeled from the carrier film is laminated
- the liquid crystal panel in which the two-color polarizing films are laminated on both sides is inspected (inspection step, S3).
- the inspection step defects are inspected based on a reflected light image obtained by irradiating light onto a liquid crystal panel in which sheet pieces of two-color polarizing films are formed on both sides (reflection inspection).
- the image data of the obtained reflected light image is subjected to image analysis to extract defects.
- a predetermined criterion threshold
- a continuous roll of reflective polarizing film is prepared (S21).
- the film width W2 of the reflective polarizing film is preferably smaller than the film width W1 of the two-color polarizing film already laminated (see FIG. 4).
- the reflective polarizing film and the carrier film are fed from the continuous roll and conveyed downstream (carrier film conveyance substep, S22).
- the reflective polarizing film is cut at a predetermined cutting interval L2 in the film width direction orthogonal to the longitudinal direction of the reflective polarizing film while leaving the carrier film to form a sheet piece of the reflective polarizing film (cutting substep, S23).
- the cutting interval L2 of the reflective polarizing film is preferably smaller than the cutting interval L1 of the two-color polarizing film (see FIG. 4).
- the transport line of the liquid crystal panel is set to L
- the liquid crystal panel is conveyed along an L-shaped conveying line, and the reflective polarizing film sheet piece is used as the two-color polarizing film.
- a sheet piece of a two-color polarizing film is laminated on the back side of the liquid crystal panel, then a sheet piece of the two-color polarizing film is laminated on the viewing side of the liquid crystal panel, and then inspected. Then, the reflective polarizing film may be attached to the sheet piece of the two-color polarizing film already laminated on the back side.
- the sheet piece laminating step further includes a film inspection substep for inspecting an optical film (two-color polarizing film, reflective polarizing film), and the cutting substep is an inspection of the film inspection substep.
- the optical film is cut according to the result.
- the cutting sub-step cuts the optical film determined to be defective according to the inspection result of the film inspection sub-step into a predetermined size (cut to avoid a defect (so-called skip cut)), and the optical film determined to be defective.
- the method further includes an exclusion sub-step for eliminating the sheet pieces.
- the film inspection sub-step may read defect information previously attached to the optical film or the carrier film, and cut it so as to avoid the defect based on the defect information.
- a defect inspection method for example, there is a method of taking an image of transmitted light or reflected light on an optical film, subjecting the image to image processing, analyzing the defect, and determining whether the product is a good product or a defective product.
- a known method can be applied to the image processing algorithm, and for example, a defect can be detected by density determination by binarization processing.
- the defect information obtained by the defect inspection is linked together with the position information (for example, position coordinates), transmitted to the control device (not shown), and contributes to the cutting process of the cutting sub-step.
- the optical film is inspected in a state where the carrier film is peeled off from the optical film (two-color polarizing film, reflective polarizing film). Is preferably bonded to the optical film.
- a continuous roll of the so-called cut two-color polarizing film or a continuous roll of the reflective polarizing film with the cut can be used.
- the cutting substep can be omitted.
- the two-color polarizing film (first and second) sheet piece laminating step, the inspection step, and the reflective polarizing film (third) sheet piece laminating step are continuously performed.
- the form is not limited to this.
- the inspection step and the third sheet piece laminating step may be continuously performed.
- the third sheet piece lamination step may be performed.
- the liquid crystal panel may be stored in the storage unit between steps that are not continuous.
- stacked on the one surface of a liquid crystal panel are a 2 color polarizing film and a reflective polarizing film, it is not restricted to this, Other optical films may be sufficient.
- a third (and subsequent) optical film may be laminated in the same sheet piece laminating step.
- the manufacturing system of the liquid crystal display element of Embodiment 1 is demonstrated referring FIG.
- the liquid crystal display element manufacturing system includes a carrier film transporting means for transporting the carrier film from a continuous roll formed by winding a carrier film on which an optical film having a predetermined film width including an adhesive is laminated, and the carrier film.
- the two or more sheet piece laminating apparatuses are, for example, a first sheet piece laminating apparatus, a second sheet piece laminating apparatus, and a third sheet piece laminating apparatus described later.
- a liquid crystal display device manufacturing system includes a first sheet piece laminating apparatus for laminating a sheet piece of an optical film on a first surface (for example, a viewing side) of a liquid crystal panel, and a second surface (for example, a back side) of the liquid crystal panel.
- a third sheet piece laminating device for laminating the sheet pieces of the optical film on the sheet pieces of the optical film laminated on the first surface or the second surface.
- the first sheet piece laminating device, the second sheet piece laminating device, the inspection device, and the third sheet piece laminating device are arranged on a continuous production line.
- the optical film to be laminated on both sides of the liquid crystal panel is a two-color polarizing film
- the optical film to be laminated on the liquid crystal panel side is reflected polarized light by sticking it to the sheet piece of one two-color polarizing film after inspection by an inspection device. It will be described as a film.
- the two-color polarizing film and reflective polarizing film laminated on the back side of the liquid crystal panel have a transmission axis in the longitudinal direction perpendicular to the film width direction, and the two-color polarizing film laminated on the viewing side of the liquid crystal panel is It demonstrates as what has a transmission axis in a film width direction.
- the first and second sheet piece laminating apparatus is a polarizing film sheet piece laminating step for laminating a two-color polarizing film sheet piece on a liquid crystal panel
- the third sheet piece laminating step comprises the first surface or
- the direction of the transmission axis of the sheet piece of the one two-color polarizing film is the same as the direction of the transmission axis of the sheet piece of the reflective polarizing film on one of the sheet pieces of the two-color polarizing film laminated on the second surface It is the sheet
- the two-color polarizing film sheet piece laminating apparatus 501 laminates the two-color polarizing film sheet pieces on the viewing side of the liquid crystal panel.
- the two-color polarizing film sheet piece laminating apparatus 502 laminates the two-color polarizing film sheet pieces on the back side of the liquid crystal panel.
- the reflective polarizing film sheet piece laminating apparatus 503 laminates the reflective polarizing film sheet piece on the two-color polarizing film sheet piece laminated on the back side of the liquid crystal panel.
- the film width W1 of the two-color polarizing film is preferably larger than the film width W2 of the reflective polarizing film (see FIG. 4). In the present embodiment, the relationship of the film width W1 of the two-color polarizing film> the film width W2 of the reflective polarizing film (see FIG. 4).
- the sheet piece laminating apparatus 501 includes a carrier film transport unit 101, a liquid crystal panel transport unit 102, and a pasting unit 103 (a pasting roll 50a and a driving roll 50b).
- the sheet piece laminating apparatus 502 includes a carrier film transport unit 201, a liquid crystal panel transport unit 202, and a pasting unit 203 (a pasting roll 50a and a driving roll 50b).
- the sheet piece laminating apparatus 503 includes a liquid crystal panel transport unit 302, a carrier film transport unit 301, and a pasting unit 303 (a pasting roll 50a and a driving roll 50b).
- the sheet piece 131 of the two-color polarizing film is pasted from the upper side (viewing side) of the liquid crystal panel 4, and then the liquid crystal panel 4 to which the sheet piece 131 is pasted is turned upside down.
- a sheet piece 131 of a two-color polarizing film is attached from above (back side).
- inspection apparatus 400 the sheet piece 231 of a reflective polarizing film is affixed from the said liquid crystal panel 4 upper side (back side).
- stacked on the visual recognition side of a liquid crystal panel has a transmission axis in the film width direction
- stacked on the back side of a liquid crystal panel is the film. Since the transmission axis is in the longitudinal direction perpendicular to the width direction, the two-color polarizing film can be laminated on the viewing side and the back side of the liquid crystal panel with straight lines without rotating the liquid crystal panel by 90 °.
- the liquid crystal panel transport unit 102 supplies and transports the liquid crystal panel 4 to the pasting unit 103.
- the liquid crystal panel transport unit 102 includes a transport roller 80 and a suction plate.
- the liquid crystal panel 4 is transported downstream of the production line by rotating the transport roller 80 or by transferring the suction plate.
- the carrier film conveying means 101 feeds out the carrier film 12 on which the two-color polarizing film 13 containing the adhesive is laminated from the continuous roll 1 and cuts the two-color polarizing film 13 at a predetermined cutting interval while leaving the carrier film 12.
- a sheet piece 131 of the two-color polarizing film is formed on the carrier film 12 and folded back with the carrier film 12 inside at the tip of the peeling means 40, and the sheet piece 131 of the two-color polarizing film (including the adhesive) ) Is peeled off and supplied to the attaching means 103 and 203.
- the carrier film transport unit 101 includes a cutting unit 20, a dancer roll 30, a peeling unit 40, and a winding unit 60.
- the cutting means 20 fixes the carrier film 12 by the adsorption means 20a, cuts the two-color polarizing film 13 at a predetermined interval, leaving the carrier film, and puts a sheet piece 131 of the two-color polarizing film on the carrier film 12.
- Examples of the cutting means 20 include a cutter and a laser device.
- the dancer roll 30 has a function of maintaining the tension of the carrier film 12.
- the carrier film transport unit 101 transports the carrier film 12 via the dancer roll 30.
- the peeling means 40 When the sheet piece 131 is attached to the liquid crystal panel 4, the peeling means 40 is folded back with the carrier film 12 inside at the tip, and the sheet piece 131 is peeled from the carrier film 12.
- the peeling means 40 uses a sharp knife edge portion at the tip portion, but is not limited to this.
- the winding means 60 winds up the carrier film 12 from which the sheet piece 131 has been peeled off. Note that a feed roller may be further provided between the sticking unit 103 and the winding unit 60.
- the affixing unit 103 affixes the sheet piece 131 of the two-color polarizing film supplied from the upper side (viewing side) of the liquid crystal panel 4 supplied from the liquid crystal panel conveying unit 102 via the adhesive.
- the sticking means 103 includes a sticking roller 50a and a driving roller 50b.
- the liquid crystal panel transport means 202 supplies the liquid crystal panel 4 to the sticking means 203 and transports it.
- the liquid crystal panel transport unit 202 includes a reversing unit 90 that flips the liquid crystal panel 4 stacked on the viewing side upside down.
- the carrier film conveying means 101 feeds out the carrier film 12 on which the two-color polarizing film 13 containing the adhesive is laminated from the continuous roll 1, and cuts the two-color polarizing film 13 at a predetermined cutting interval L1 while leaving the carrier film 12.
- a two-color polarizing film sheet piece 131 is formed on the carrier film 12 and folded at the tip of the peeling means 40 with the carrier film 12 facing inward, and the two-color polarizing film sheet piece 131 (adhesive is removed) from the carrier film 12.
- the sticking means 203 sticks the sheet piece 131 of the two-color polarizing film supplied from the upper side (back side) of the liquid crystal panel 4 supplied from the liquid crystal panel transport means 202 via the adhesive.
- the reflection type inspection apparatus 400 will be described.
- the liquid crystal panel 4 in which the sheet pieces 131 of the two-color polarizing film are laminated on both sides is conveyed to the reflection type inspection apparatus 400 by the liquid crystal panel conveying means 202.
- the reflection type inspection device 400 optically inspects the liquid crystal panel 4.
- the reflective inspection apparatus 400 irradiates light perpendicularly to a surface (from top to bottom in FIG. 3) that is the back side of the liquid crystal panel 4 that has been conveyed.
- Light from the irradiation unit 401 is reflected by a half mirror (not shown) and irradiates the liquid crystal panel 4 in a stopped state.
- the reflected light image by this irradiation is picked up by the image pickup means 402.
- this transmitted light image may be picked up by the image pickup means 403.
- the image data of the reflected light image (and the transmitted light image) obtained by imaging is subjected to image processing by the information processing unit of the reflection type inspection apparatus 400, the defect is analyzed, and the determination unit determines whether it is a non-defective product or a defective product. .
- the surface on the back side of the liquid crystal panel 4 is irradiated with light at a predetermined angle (for example, 45 ° to 89 ° with respect to the liquid crystal panel surface) and reflected by the liquid crystal panel surface.
- the reflected light image thus obtained may be picked up by the image pickup means.
- the sheet piece laminating apparatus 503 attaches the sheet piece 231 of the reflective polarizing film to the sheet piece 131 of the two-color polarizing film with respect to the liquid crystal panel determined to be a non-defective product based on the inspection result.
- the liquid crystal panel determined to be defective by the inspection result is conveyed to the defective product port and eliminated.
- the defective liquid crystal panel may be transported to the defective product port by the liquid crystal panel transport means 302, the pasting means 303, and the transport means 304.
- the reflective polarizing film sheet piece laminating apparatus 503 will be described.
- the reflective polarizing film sheet piece laminating apparatus 503 is an apparatus for attaching the reflective polarizing film sheet piece 231 to the two-color polarizing film sheet piece 131 laminated on the back side of the liquid crystal panel 4. Since it is the same structure as the sheet piece laminating apparatus 501 and 502 of this, it demonstrates easily.
- the liquid crystal panel transport unit 302 transports the liquid crystal panel 4 on which the sheet pieces 131 are pasted by the pasting units 103 and 203 and supplies the liquid crystal panel 4 to the pasting unit 303.
- the carrier film transport unit 301 can be configured by the same device as the carrier film transport unit 101, and the pasting unit 303 can be configured by the same device as the pasting unit 103.
- the dancer roll can be constituted by the same device as the dancer roll 30
- the winding means can be constituted by the same device as the winding means 60
- the sticking roller and the driving roller have the same mechanism as the sticking roller 50a and the driving roller 50b. Can be configured.
- the cutting means 20 fixes the carrier film 22 by the adsorption means 20a, cuts the reflective polarizing film 23 at a predetermined interval L2 (L1> L2), leaving the carrier film 22, and the reflective polarizing film on the carrier film 22
- L2 L1> L2
- the affixing means 303 is a two-color polarizing film through a pressure-sensitive adhesive sheet 231 of the reflective polarizing film supplied from the upper side (back side) of the liquid crystal panel 4 supplied by the liquid crystal panel conveying means 302 by the carrier film conveying means 301.
- the sheet piece 131 is attached.
- the control unit 300 controls the cutting means 20 and the carrier film conveying means 101, 201, 301 to control the cutting interval L1 of the sheet piece 131 of the two-color polarizing film and the cutting interval L2 of the sheet piece 231 of the reflective polarizing film.
- the cutting interval L1 is the length in the direction orthogonal to the film width direction of the sheet piece 131 of the two-color polarizing film (see FIG. 4).
- the cutting interval L2 is the length in the direction orthogonal to the film width direction of the sheet piece 231 of the reflective polarizing film (see FIG. 4).
- the predetermined intervals L1 and L2 for cutting are stored in advance in the memory of the control unit 300, and the control unit 300 controls the feeding amount of the carrier film and the cutting process so as to cut at the predetermined intervals L1 and L2.
- the feed amount may be measured, for example, by detection of an encoder that measures the rotation amount of a feed roller or the like that constitutes a part of the carrier film transport unit 101, 201. It is preferable that the controller 300 controls the cutting unit 20 and the carrier film transport unit 201 so that L2 of the reflective polarizing film is smaller than L1 of the two-color polarizing film.
- the liquid crystal panel transport means 304 transports the liquid crystal panel 4 (liquid crystal display element) in which a sheet piece 131 of a two-color polarizing film is laminated on both sides and a sheet piece 231 of a reflective polarizing film on the back side to the downstream side.
- the sheet piece of the optical film may be pasted on the surface of one of the liquid crystal panels on the downstream side of the transport using another sheet piece laminating apparatus.
- the operation timing of each of the above means and devices is calculated by, for example, a method of detecting by arranging a sensor at a predetermined position, or calculated by detecting the rotating member of the conveying means or the conveying mechanism with a rotary encoder or the like. Is done.
- the control unit may be realized by a cooperative action of a software program and a hardware resource such as a CPU and a memory.
- a memory is stored in advance for program software, a processing procedure, various settings, and the like. Further, it can be configured by a dedicated circuit or firmware.
- the two-color polarizing film (first and second) sheet piece laminating device, the inspection device, and the reflective polarizing film (third) sheet piece laminating device are arranged in a continuous production line.
- the embodiment is not limited to this.
- the first sheet piece laminating device and the second sheet piece laminating device are arranged on a continuous production line, and the inspection step and the third sheet piece laminating device are arranged on a production line different from the continuous production line.
- the first sheet piece laminating device, the second sheet piece laminating device, and the inspection device may be arranged on a continuous production line, and the third sheet piece laminating device may be arranged on another production line.
- a liquid crystal panel may be stored in the storage unit between devices that are not continuous.
- Example 10 Prepare 1000 samples of a liquid crystal panel (32-inch size, 400.1 vertical x 705.5 mm wide) on both sides of a sheet of two-color polarizing film (VEGQ1724DU manufactured by Nitto Denko Corporation). As a result of inspection, 20 out of 1000 sheets were determined to be defective (indentations, bubbles). In 20 samples determined to be defective, a sheet piece of a reflective polarizing film (DBEF manufactured by 3M) was laminated on a sheet piece of a two-color polarizing film laminated on the surface on the back side of the liquid crystal panel, and similarly. Inspected with a reflection inspection device. As a result, 7 out of 20 sheets were determined to be defective. From this experiment, it was found that it is effective to perform a reflection inspection before laminating the reflective polarizing film.
- DBEF reflective polarizing film
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Abstract
Description
液晶パネルの第1面に光学フィルムのシート片を積層する第1シート片積層ステップと、
前記液晶パネルの第2面に光学フィルムのシート片を積層する第2シート片積層ステップと、
前記光学フィルムのシート片が両面に形成された前記液晶パネルを光学的に検査する検査ステップと、
前記検査ステップの後、第1面または第2面に積層された光学フィルムのシート片に、光学フィルムのシート片を積層する第3シート片積層ステップと、を含む。
この構成によって、両面に光学フィルムが積層された後に液晶パネルを光学的に検査して、例えば、良品(正常品の)の液晶パネルに対しさらに別の光学フィルムのシート片を積層することができるため、光学フィルムの歩留まりを低下させないようにできる。
上記発明の一実施形態として、前記第1シート片積層ステップ、前記第2シート片積層ステップ、前記検査ステップ、および前記第3シート片積層ステップを連続して行う。これによって、液晶パネルの両面に光学フィルムのシート片を積層した(液晶パネルの一方面にはシート片が2枚積層されている)液晶表示素子を連続的に製造できるため、生産性を向上できる。また、別実施形態として、前記第1シート片積層ステップおよび前記第2シート片積層ステップを連続して行った後、前記検査ステップおよび前記第3シート片積層ステップを連続して行ってもよく、前記第1シート片積層ステップ、前記第2シート片積層ステップ及び検査ステップを連続して行った後、前記第3シート片積層ステップを行ってもよい。
前記検査ステップ後に積層される光学フィルムのシート片は、前記検査ステップによる検査精度を低下させる特性を有する。この光学フィルムとして、反射偏光フィルム等の輝度向上フィルムが例示される。
この構成によって、検査精度を低下させずに光学的検査を行え、検査後に、検査精度を低下させるような光学フィルムのシート片を積層させることができる。
前記第3シート片積層ステップは、第1面または第2面に積層された2色偏光フィルムのシート片の一方に、当該一方の2色偏光フィルムのシート片の透過軸の方向と、反射偏光フィルムのシート片の透過軸の方向とが同じ方向となるように、当該反射偏光フィルムのシート片を貼り付ける反射偏光フィルムのシート片積層ステップであることが好ましい。
液晶パネルの第1面に光学フィルムのシート片を積層する第1シート片積層装置と、
前記液晶パネルの第2面に光学フィルムのシート片を積層する第2シート片積層装置と、
前記光学フィルムのシート片が両面に形成された前記液晶パネルを光学的に検査する検査装置と、
前記検査装置による検査後に、第1面または第2面に積層された光学フィルムのシート片に、光学フィルムのシート片を積層する第3シート片積層装置とを備える。
この構成によって、両面に光学フィルムが積層された後に液晶パネルを光学的に検査して、例えば、良品(正常品の)の液晶パネルに対しさらに別の光学フィルムのシート片を積層することができるため、光学フィルムの歩留まりを低下させないようにできる。
前記検査装置による検査後に積層される光学フィルムのシート片は、前記検査装置による検査精度を低下させる特性を有する。この光学フィルムとして、反射偏光フィルム等の輝度向上フィルムが例示される。
この構成によって、検査精度を低下させずに光学的検査を行え、検査後に、検査精度を低下させるような光学フィルムのシート片を積層させることができる。
前記第3シート片積層ステップは、第1面または第2面に積層された2色偏光フィルムのシート片の一方に、当該一方の2色偏光フィルムのシート片の透過軸の方向と、反射偏光フィルムのシート片の透過軸の方向とが同じ方向となるように、当該反射偏光フィルムのシート片を貼り付ける反射偏光フィルムのシート片積層装置であることが好ましい。
液晶パネルの第1面に光学フィルムのシート片を積層する第1シート片積層ステップと、
前記液晶パネルの第2面に光学フィルムのシート片を積層する第2シート片積層ステップと、
前記光学フィルムのシート片が両面に形成された前記液晶パネルを光学的に検査する検査ステップと、
前記検査ステップの後、第1面または第2面に積層された光学フィルムのシート片に、光学フィルムのシート片を積層する第3シート片積層ステップと、を含む。
液晶パネルの第1面に光学フィルムのシート片を積層する第1シート片積層装置と、
前記液晶パネルの第2面に光学フィルムのシート片を積層する第2シート片積層装置と、
前記光学フィルムのシート片が両面に形成された前記液晶パネルを光学的に検査する検査装置と、
前記検査装置による検査後に、第1面または第2面に積層された光学フィルムのシート片に、光学フィルムのシート片を積層する第3シート片積層装置と、を備える。
前記切断サブステップは、フィルム検査サブステップの検査結果に応じて当該光学フィルムを切断することが好ましい。検査は、光学フィルムの欠点について検査することを意味する。また、検査結果に応じて光学フィルムを切断する場合に、欠点部分を避けて切断するように構成できる。欠点部分を不良品として所定サイズに切断し、液晶パネルに貼り合わせないように、例えば排除装置等で排除することが好ましい。
また、光学フィルムに含まれる粘着剤は、特に制限されないが、例えば、アクリル系粘着剤、シリコーン系粘着剤、ウレタン系粘着剤等が挙げられる。キャリアフィルムは、例えばプラスチックフィルム(例えば、ポリエチレンテレフタレート系フィルム、ポリオレフィン系フィルム等)等のフィルムを用いることができる。また、必要に応じシリコーン系や長鎖アルキル系、フッ素系や硫化モリブデン等の適宜な剥離剤でコート処理したものなどの適宜なものを用いうる。
本実施形態において、光学フィルムがキャリアフィルムに形成されている形態は特に制限されない。例えば、ロール状に巻かれた連続ロールで構成されていてもよい。連続ロールとしては、例えば、(1)キャリアフィルムと当該キャリアフィルム上に形成された粘着剤を含む光学フィルムとを有する光学フィルム積層体をロール状に巻いたものが挙げられる。この場合、液晶表示素子の連続製造システムは、光学フィルムから光学フィルムのシート片を形成するために、キャリアフィルムを切断せずに残して、当該光学フィルム(粘着剤を含む)を所定の切断間隔に切断(ハーフカット)する切断手段を有する。この切断において、例えば、連続製造システム内の欠点検査装置の検査結果に基づいて、良品のシート片と、不良品のシート片を区別するように切断が行われてもよい。
液晶表示素子は、液晶パネルの片面または両面に少なくとも(2色)偏光フィルムのシート片が形成されたものであり、必要に応じて駆動回路が組込まれる。液晶パネルは、例えば、垂直配向(VA)型、面内スイッチング(IPS)型などの任意なタイプのものを用いることができる。図1に示す液晶パネル4は、対向配置される一対の基板(第1基板、第2基板)間に液晶層が封止された構成である。
(液晶表示素子の製造方法)
実施形態1について以下に説明する。液晶表示素子の製造方法は、粘着剤を含む所定のフィルム幅の光学フィルムが積層されたキャリアフィルムを巻回してなる連続ロールから、当該キャリアフィルムを搬送するキャリアフィルム搬送サブステップと、当該キャリアフィルムを残して光学フィルムの長手方向と直交するフィルム幅方向に所定の切断間隔で当該光学フィルムを切断して光学フィルムのシート片を形成する切断サブステップと、液晶パネルを搬送する搬送サブステップと、前記液晶パネルを搬送しながら、前記キャリアフィルムから剥離された前記シート片を前記粘着剤を介して当該液晶パネル側に積層する貼付サブステップとを含む光学フィルムのシート片積層ステップを2以上含む。この2以上のシート片積層ステップは、例えば、後述する第1シート片積層ステップ、第2シート片積層ステップ、第3シート片積層ステップである。液晶表示素子の製造方法は、液晶パネルの第1面(例えば、視認側)に光学フィルムのシート片を積層する第1シート片積層ステップと、前記液晶パネルの第2面(例えば、背面側)に光学フィルムのシート片を積層する第2シート片積層ステップと、前記光学フィルムのシート片が両面に形成された前記液晶パネルを光学的に検査する検査ステップと、前記検査ステップの後、第1面または第2面に積層された光学フィルムのシート片に、光学フィルムのシート片を積層する第3シート片積層ステップとを含む。
また、上記実施形態では、2色偏光フィルム(第1、第2)シート片積層ステップ、検査ステップ、および反射偏光フィルム(第3)シート片積層ステップを連続して行うものであったが、実施形態はこれに制限されない。例えば、別実施形態として、第1シート片積層ステップおよび第2シート片積層ステップを連続して行った後、検査ステップおよび第3シート片積層ステップを連続して行ってもよく、第1シート片積層ステップ、第2シート片積層ステップ及び検査ステップを連続して行った後、第3シート片積層ステップを行ってもよい。連続していないステップ間では、格納部に液晶パネルを格納しておいてもよい。
実施形態1の液晶表示素子の製造システムについて図3を参照しながら説明する。液晶表示素子の製造システムは、粘着剤を含む所定のフィルム幅の光学フィルムが積層されたキャリアフィルムを巻回してなる連続ロールから、当該キャリアフィルムを搬送するキャリアフィルム搬送手段と、当該キャリアフィルムを残して光学フィルムの長手方向と直交するフィルム幅方向に所定の切断間隔で当該光学フィルムを切断して光学フィルムのシート片を形成する切断手段と、液晶パネルを搬送する搬送手段と、前記液晶パネルを搬送しながら、前記キャリアフィルムから剥離された前記シート片を前記粘着剤を介して当該液晶パネル側に積層する貼付手段とを備える光学フィルムのシート片積層装置を2以上備える。この2以上のシート片積層装置は、例えば、後述する第1シート片積層装置、第2シート片積層装置、第3シート片積層装置である。液晶表示素子の製造システムは、液晶パネルの第1面(例えば、視認側)に光学フィルムのシート片を積層する第1シート片積層装置と、前記液晶パネルの第2面(例えば、背面側)に光学フィルムのシート片を積層する第2シート片積層装置と、前記光学フィルムのシート片が両面に形成された前記液晶パネルを光学的に検査する検査装置と、前記検査装置による検査後に、第1面または第2面に積層された光学フィルムのシート片に、光学フィルムのシート片を積層する第3シート片積層装置とを備える。本実施形態では、第1シート片積層装置、第2シート片積層装置、検査装置、および第3シート片積層装置を連続製造ラインに配置してある。
液晶パネル搬送手段102は、貼付手段103に液晶パネル4を供給し搬送する。本実施形態では、液晶パネル搬送手段102は、搬送ローラ80および吸着プレート等を有して構成される。搬送ローラ80を回転させることで、あるいは吸着プレートを移送させることで、液晶パネル4を製造ライン下流側へ搬送する。
キャリアフィルム搬送手段101は、連続ロール1から粘着剤を含む2色偏光フィルム13が積層されたキャリアフィルム12を繰り出し、キャリアフィルム12を残して2色偏光フィルム13を所定の切断間隔で切断して2色偏光フィルムのシート片131をキャリアフィルム12上に形成し、剥離手段40の先端でキャリアフィルム12を内側にして折り返して、キャリアフィルム12から2色偏光フィルムのシート片131(粘着剤を含む)を剥離し、貼付手段103、203に供給する。そのために、キャリアフィルム搬送手段101は、切断手段20、ダンサーロール30、剥離手段40、巻取手段60を有する。
貼付手段103は、液晶パネル搬送手段102により供給された液晶パネル4の上側(視認側)からキャリアフィルム搬送手段101により供給された2色偏光フィルムのシート片131を粘着剤を介して貼り付ける。本実施形態では、貼付手段103は、貼付ローラ50a、駆動ローラ50bで構成される。
制御部300は、切断手段20およびキャリアフィルム搬送手段101、201、301を制御して、2色偏光フィルムのシート片131の切断間隔L1、反射偏光フィルムのシート片231の切断間隔L2を制御する。切断間隔L1は、2色偏光フィルムのシート片131のフィルム幅方向と直交する方向の長さになる(図4参照)。切断間隔L2は、反射偏光フィルムのシート片231のフィルム幅方向と直交する方向の長さになる(図4参照)。例えば、切断の所定間隔L1、L2は、制御部300のメモリに予め記憶されており、この所定間隔L1、L2で切断するように、制御部300は、キャリアフィルムの送り量および切断処理を制御する。送り量は、例えば、キャリアフィルム搬送手段101、201の一部を構成するフィードローラ等の回転量を測定するエンコーダの検出によって測定してもよい。制御部300は、反射偏光フィルムのL2が2色偏光フィルムのL1よりも小さくなるように切断手段20およびキャリアフィルム搬送手段201を制御することが好ましい。
上記実施形態において、2色偏光フィルム(第1、第2)シート片積層装置、検査装置、および反射偏光フィルム(第3)シート片積層装置を連続製造ラインに配置してあるものであったが、実施形態はこれに制限されない。例えば、別実施形態として、第1シート片積層装置および第2シート片積層装置を連続製造ラインに配置し、この連続製造ラインとは別の製造ラインに、検査ステップおよび第3シート片積層装置を配置してもよく、第1シート片積層装置、第2シート片積層装置及び検査装置を連続製造ラインに配置し、前記第3シート片積層装置を別の製造ラインに配置してもよい。連続していない装置間では、格納部に液晶パネルを格納しておいてもよい。
液晶パネル(32インチサイズ、縦400.1×横幅705.5mm)の両面に2色偏光フィルム(日東電工株式会社製 VEGQ1724DU)のシート片を積層したサンプルを1000枚準備し、上記反射式検査装置で検査した結果、1000枚中20枚が不良(打痕、気泡)として判定された。この不良として判定されたサンプル20枚において、液晶パネルの背面側となる面に積層された2色偏光フィルムのシート片に反射偏光フィルム(3M社製 DBEF)のシート片を積層し、同じように反射式検査装置で検査した。その結果、20枚中7枚が不良として判定された。この実験から、反射偏光フィルムを積層する前に反射式検査を実行することが有効であることが分かった。
4 液晶パネル
20 切断手段
40 剥離手段
101、201、301 キャリアフィルム搬送手段
102、202、302 液晶パネル搬送手段
103、203,303 貼付手段
131 2色偏光フィルムのシート片
231 反射偏光フィルムのシート片
501、502、503 シート片積層装置
Claims (12)
- 粘着剤を含む所定のフィルム幅の光学フィルムが積層されたキャリアフィルムを巻回してなる連続ロールから、当該キャリアフィルムを搬送するキャリアフィルム搬送サブステップと、当該キャリアフィルムを残して光学フィルムの長手方向と直交するフィルム幅方向に所定の切断間隔で当該光学フィルムを切断して光学フィルムのシート片を形成する切断サブステップと、液晶パネルを搬送する搬送サブステップと、前記液晶パネルを搬送しながら、前記キャリアフィルムから剥離された前記シート片を前記粘着剤を介して当該液晶パネル側に積層する貼付サブステップとを含む光学フィルムのシート片積層ステップを2以上含む、液晶表示素子の製造方法であって、
液晶パネルの第1面に光学フィルムのシート片を積層する第1シート片積層ステップと、
前記液晶パネルの第2面に光学フィルムのシート片を積層する第2シート片積層ステップと、
前記光学フィルムのシート片が両面に形成された前記液晶パネルを光学的に検査する検査ステップと、
前記検査ステップの後、第1面または第2面に積層された光学フィルムのシート片に、光学フィルムのシート片を積層する第3シート片積層ステップと、を含む液晶表示素子の製造方法。 - 前記第1シート片積層ステップ、前記第2シート片積層ステップ、前記検査ステップ、および前記第3シート片積層ステップを連続して行う、請求項1に記載の液晶表示素子の製造方法。
- 前記検査ステップは、光学フィルムのシート片が両面に形成された液晶パネルに光を照射して得られた反射光像に基づいて欠点を検査し、
前記検査ステップ後に積層される光学フィルムのシート片は、前記検査ステップによる検査精度を低下させる特性を有する、請求項1または2に記載の液晶表示素子の製造方法。 - 前記第1、第2シート片積層ステップは、2色偏光フィルムのシート片を液晶パネルに積層する偏光フィルムのシート片積層ステップであり、
前記第3シート片積層ステップは、第1面または第2面に積層された2色偏光フィルムのシート片の一方に、当該一方の2色偏光フィルムのシート片の透過軸の方向と、反射偏光フィルムのシート片の透過軸の方向とが同じ方向となるように、当該反射偏光フィルムのシート片を貼り付ける反射偏光フィルムのシート片積層ステップである、請求項1から3のいずれか1項に記載の液晶表示素子の製造方法。 - 前記2色偏光フィルムのシート片積層ステップにおいて、フィルム幅方向と直交する長手方向に透過軸を有する2色偏光フィルムのシート片を前記液晶パネルに積層した後、前記反射偏光フィルムのシート片積層ステップにおいて、フィルム幅方向と直交する長手方向に透過軸を有する反射偏光フィルムのシート片を当該2色偏光フィルムのシート片に貼り付ける、請求項4に記載の液晶表示素子の製造方法。
- 粘着剤を含む所定のフィルム幅の光学フィルムが積層されたキャリアフィルムを巻回してなる連続ロールから、当該キャリアフィルムを搬送するキャリアフィルム搬送手段と、当該キャリアフィルムを残して光学フィルムの長手方向と直交するフィルム幅方向に所定の切断間隔で当該光学フィルムを切断して光学フィルムのシート片を形成する切断手段と、液晶パネルを搬送する搬送手段と、前記液晶パネルを搬送しながら、前記キャリアフィルムから剥離された前記シート片を前記粘着剤を介して当該液晶パネル側に積層する貼付手段とを備える光学フィルムのシート片積層装置を2以上備える、液晶表示素子の製造システムであって、
液晶パネルの第1面に光学フィルムのシート片を積層する第1シート片積層装置と、
前記液晶パネルの第2面に光学フィルムのシート片を積層する第2シート片積層装置と、
前記光学フィルムのシート片が両面に形成された前記液晶パネルを光学的に検査する検査装置と、
前記検査装置による検査後に、第1面または第2面に積層された光学フィルムのシート片に、光学フィルムのシート片を積層する第3シート片積層装置と、を備える液晶表示素子の製造システム。 - 前記第1シート片積層装置、前記第2シート片積層装置、前記検査装置、および前記第3シート片積層装置を連続製造ラインに配置してある、請求項6に記載の液晶表示素子の製造システム。
- 前記検査装置は、光学フィルムのシート片が両面に形成された液晶パネルに光を照射して得られた反射光像に基づいて欠点を検査し、
前記検査装置による検査後に積層される光学フィルムのシート片は、前記検査装置による検査精度を低下させる特性を有する、請求項6または7に記載の液晶表示素子の製造システム。 - 前記第1、第2シート片積層装置は、2色偏光フィルムのシート片を液晶パネルに積層する偏光フィルムのシート片積層ステップであり、
前記第3シート片積層ステップは、第1面または第2面に積層された2色偏光フィルムのシート片の一方に、当該一方の2色偏光フィルムのシート片の透過軸の方向と、反射偏光フィルムのシート片の透過軸の方向とが同じ方向となるように、当該反射偏光フィルムのシート片を貼り付ける反射偏光フィルムのシート片積層装置である請求項6から8のいずれか1項に記載の液晶表示素子の製造システム。 - 前記2色偏光フィルムのシート片積層装置が、フィルム幅方向と直交する長手方向に透過軸を有する2色偏光フィルムのシート片を前記液晶パネルに積層した後、前記反射偏光フィルムのシート片積層装置が、フィルム幅方向と直交する長手方向に透過軸を有する反射偏光フィルムのシート片を当該2色偏光フィルムのシート片に貼り付ける、請求項9に記載の液晶表示素子の製造システム。
- 粘着剤を含む光学フィルムのシート片が互いに隣り合って複数積層されたキャリアフィルムを巻回してなる連続ロールから、当該キャリアフィルムを搬送するキャリアフィルム搬送サブステップと、液晶パネルを搬送する搬送サブステップと、前記液晶パネルを搬送しながら、前記キャリアフィルムから剥離された前記シート片を前記粘着剤を介して当該液晶パネル側に積層する貼付サブステップとを含む光学フィルムのシート片積層ステップを2以上含む、液晶表示素子の製造方法であって、
液晶パネルの第1面に光学フィルムのシート片を積層する第1シート片積層ステップと、
前記液晶パネルの第2面に光学フィルムのシート片を積層する第2シート片積層ステップと、
前記光学フィルムのシート片が両面に形成された前記液晶パネルを光学的に検査する検査ステップと、
前記検査ステップの後、第1面または第2面に積層された光学フィルムのシート片に、光学フィルムのシート片を積層する第3シート片積層ステップと、を含む液晶表示素子の製造方法。 - 粘着剤を含む光学フィルムのシート片が互いに隣り合って複数積層されたキャリアフィルムを巻回してなる連続ロールから、当該キャリアフィルムを搬送するキャリアフィルム搬送手段と、液晶パネルを搬送する搬送手段と、前記液晶パネルを搬送しながら、前記キャリアフィルムから剥離された前記シート片を前記粘着剤を介して当該液晶パネル側に積層する貼付手段とを備える光学フィルムのシート片積層装置を2以上備える、液晶表示素子の製造システムであって、
液晶パネルの第1面に光学フィルムのシート片を積層する第1シート片積層装置と、
前記液晶パネルの第2面に光学フィルムのシート片を積層する第2シート片積層装置と、
前記光学フィルムのシート片が両面に形成された前記液晶パネルを光学的に検査する検査装置と、
前記検査装置による検査後に、第1面または第2面に積層された光学フィルムのシート片に、光学フィルムのシート片を積層する第3シート片積層装置と、を備える液晶表示素子の製造システム。
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