CN1266497C - Circular polarizing disk and liquid crystal display - Google Patents
Circular polarizing disk and liquid crystal display Download PDFInfo
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- CN1266497C CN1266497C CNB021268770A CN02126877A CN1266497C CN 1266497 C CN1266497 C CN 1266497C CN B021268770 A CNB021268770 A CN B021268770A CN 02126877 A CN02126877 A CN 02126877A CN 1266497 C CN1266497 C CN 1266497C
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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
- G02F1/13363—Birefringent elements, e.g. for optical compensation
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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
- G02F1/133528—Polarisers
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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
- G02F2413/00—Indexing scheme related to G02F1/13363, i.e. to birefringent elements, e.g. for optical compensation, characterised by the number, position, orientation or value of the compensation plates
- G02F2413/02—Number of plates being 2
Abstract
In each of a pair of right-and left-handed circularly polarizing plates, at least one birefringent layer providing a retardation of a half wavelength is disposed between a polarizer and a birefringent layer providing a retardation of a quarter wavelength. An optical axis of the birefringent layer providing of the half-wavelength retardation intersects an optical axis of the birefringent layer providing the quarter-wavelength retardation. One of the pair of right-and left-handed circularly polarizing plates is provided with the birefringent layers equal in number to the birefringent layers of the other circularly polarizing plate. The birefringent layers in one circularly polarizing plate totally provide a retardation of a quarter wavelength in all or part of a wavelength range of from 200 to 1,000 nm. When the birefringent layers included in one circularly polarizing plate are numbered from a first layer to an n-th layer in order of distance from the polarizer in the case where the pair of circularly polarizing plates are disposed opposite to each other so that the polarizers included in the circularly polarizing plates respectively are located on the outer sides, each of crossing angles between fast axes of the first layers, between fast axes of the second layers, ..., between fast axes of the n-th layers and between transmission axes of the polarizers in the pair of circularly polarizing plates is in a range of from 80 to 100 degrees.
Description
The present patent application is based on day disclosure special permission communique No.2001-216147, its content of this paper incorporated by reference.
Technical field
The present invention relates to a pair of dextrorotation and Left-hand circular polarization sheet, it provides the circularly polarized light of very wide wavelength coverage, and dextrorotation and Left-hand circular polarization sheet can be united use, are used to form the liquid crystal indicator of high-contrast.
Background technology
For a pair of dextrorotation that constitutes by quarter-wave lengthy motion picture and polaroid lamination and Left-hand circular polarization sheet, know so far and have a kind of assembly, wherein the optical axis of each quarter-wave lengthy motion picture (slow axis or fast axle) is as fixed system, thus, the absorption axes of each polaroid or the axis of homology (polarization axle) are arranged to rotate mutually 90 degree.Quarter-wave lengthy motion picture for each sheet that is used for a pair of polaroid, having known has a kind of quarter-wave lengthy motion picture to be made of stacked a plurality of birefringent layers, so the optical axis of birefringent layers is intersecting each other, the circularly polarized light that the quarter-wave lengthy motion picture forms has very wide wavelength coverage and (sees day clear and 5-100114 of disclosure special permission communique, clear and the 11-231132 of day disclosure special permission communique, day disclosure special permission communique NO.2001-4837 etc.).
A pair of dextrorotation and Left-hand circular polarization sheet are separately positioned on the both sides of liquid crystal indicator, as the τ type, postpone almost nil state before it utilizes, to realize high-contrast or similar performance.Yet its existence is difficult to avoid forming the problem of black state, even using a pair of dextrorotation or Left-hand circular polarization sheet to cause under the situation that left circularly polarized light and right-circularly polarized light overlap each other.This problem causes contrast to reduce, because when a pair of circular polarizing disk was fixed on the liquid crystal indicator, light leak appearred in black display.
Summary of the invention
The objective of the invention is to obtain a pair of dextrorotation and Left-hand circular polarization sheet, when left circularly polarized light and right-handed polarized light overlap each other, can form good black state, can be used for forming the liquid crystal indicator of high-contrast.
According to the present invention, a pair of dextrorotation and Left-hand circular polarization sheet are provided, each circular polarizing disk has: polaroid, the birefringent layers of quarter-wave long delay is provided, with at least one birefringent layers that provides 1/2nd wavelength to postpone, be arranged between described polaroid and the described birefringent layers that the quarter-wave long delay is provided; So described optical axis and described optical axis intersection that the birefringent layers of quarter-wave long delay is provided that the birefringent layers of 1/2nd wavelength delay is provided, wherein, the described birefringent layers that a slice in described a pair of dextrorotation and left-handed circular polarizing disk is provided with quantitatively equates with the quantity of the described birefringent layers of another sheet, for wavelength is 200 part or all of wavelength in the 1000nm scope, and the birefringent layers that each sheet of described a pair of circular polarizing disk comprises all provides quarter-wave delay; When described a pair of circular polarizing disk is oppositely arranged, the birefringent layers that described each sheet of a pair of circular polarizing disk comprises is that preface is discharged to the n layer from the ground floor numbering with the distance of distance polaroid, the polaroid that described a pair of circular polarizing disk comprises lays respectively at the outside, the angle of the crossing between the fast axle of ground floor, the angle of the crossing between the fast axle of the second layer, ..., the angle of the angle of the crossing between the axis of homology of the angle of the crossing between the fast axle of n layer and the described polaroid of described a pair of circular polarizing disk is in the scope of 80 to 100 degree, it is characterized in that, for wavelength is the light of 633nm, and the strain optical coefficient of each described birefringent layers is not more than 5 * 10
-11m
2/ N particularly is not more than 1 * 10
-11m
2/ N.
In addition, according to the present invention, provide liquid crystal indicator, it has: liquid crystal display; With a pair of dextrorotation as defined above and Left-hand circular polarization sheet, separately be arranged on the both sides of described liquid crystal cells, the described polaroid that a pair of circular polarizing disk is comprised lays respectively at the outside; Wherein, being arranged on the described birefringent layers that each sheet of described a pair of circular polarizing disk of the opposite side of described liquid crystal cells comprises is that preface is discharged to the n layer from the ground floor numbering with the distance apart from described refractor, the angle of the crossing between the angle of the crossing between the fast axle of described ground floor, the fast axle of the described second layer ... the angle of the angle of the crossing between the axis of homology of the angle of the crossing between the fast axle of described n layer and the described polaroid of described a pair of circular polarizing disk is in the scopes of 80 to 100 degree.
According to the present invention, obtained a pair of dextrorotation and Left-hand circular polarization sheet, when left circularly polarized light and right-handed polarized light overlap each other, can form good black state, this can be used for forming the high-contrast liquid crystal indicator.This is based on by short wavelength side and long wavelength side are carried out slight deformation converts elliptically polarized light to the circularly polarized light that prevents each circular polarizing disk generation a kind of technology.
That is, the inventor studies through great efforts, has overcome the problem that the contrast of LCD degree descends.Described display device is used the circular polarizing disk of a pair of left-handed and dextrorotation, and polaroid is arranged to make the axis of homology of the polaroid that a pair of circular polarizing disk comprises to relatively rotate 90 degree respectively.Consequently, found that the reason that contrast reduces is because by producing the orthogonality that slight deformation causes the position angle displacement so destroyed the axis of homology at short wavelength side and long wavelength side, the circularly polarized light that each polaroid produces converts elliptically polarized light to.
The features and advantages of the present invention will be by having clearer introduction below in conjunction with accompanying drawing to the detailed introduction of preferred embodiment.
Description of drawings.
Fig. 1 has shown the example of a pair of circular polarizing disk.
Embodiment
A pair of circular polarizing disk according to the present invention is a pair of dextrorotation and Left-hand circular polarization sheet, each polaroid has: polaroid, the birefringent layers of quarter-wave long delay is provided, with at least one birefringent layers that provides 1/2nd wavelength to postpone, be arranged between described polaroid and the described birefringent layers that the quarter-wave long delay is provided; So described optical axis and described optical axis intersection that the birefringent layers of quarter-wave long delay is provided that the birefringent layers of 1/2nd wavelength delay is provided, wherein, the described birefringent layers that a slice in described a pair of dextrorotation and left-handed circular polarizing disk is provided with quantitatively equates with the quantity of the described birefringent layers of another sheet, for wavelength is 200 part or all of wavelength in the 1000nm scope, and the birefringent layers that each sheet of described a pair of circular polarizing disk comprises all provides quarter-wave delay; When described a pair of circular polarizing disk is oppositely arranged, the birefringent layers that described each sheet of a pair of circular polarizing disk comprises is that preface is discharged to the n layer from the ground floor numbering with the distance of distance polaroid, the polaroid that described a pair of circular polarizing disk comprises lays respectively at the outside, the angle of the crossing between the fast axle of ground floor, the angle of the crossing between the fast axle of the second layer, ..., the angle of the angle of the crossing between the axis of homology of the angle of the crossing between the fast axle of n layer and the described polaroid of described a pair of circular polarizing disk is in the scope of 80 to 100 degree.
Fig. 1 has shown the example of a pair of circular polarizing disk.In Fig. 1, in mark 1 a pair of dextrorotation of expression and the Left-hand circular polarization sheet one, another in 2 a pair of dextrorotation of expression and the Left-hand circular polarization sheet.11 and 21 is polaroids, and 12,13,22 and 23 have provided the birefringent layers that 1/2nd wavelength postpone, and 14 and 24 have provided the birefringent layers that 1/2nd wavelength postpone.Mention in passing, Fig. 1 has shown that a pair of circular polarizing disk is applied to the situation on the liquid crystal indicator.Reference marker 3 expression liquid crystal displays.
As shown in Figure 1, each sheet of a pair of dextrorotation and Left-hand circular polarization sheet 1 and 2 comprises polaroid 11 or 21, and the birefringent layers 14 or 24 of quarter-wave long delay is provided, one, two or more birefringent layers 12 and 13 or 22 and 23 providing 1/2nd wavelength to postpone.Birefringent layers 12 and 13 or 22 and 23 be arranged on polaroid 11 or 12 and birefringent layers 14 or 24 between, so the optical axis of birefringent layers 12 and 13 or 22 and 23 with the birefringent layers 14 of quarter-wave long delay or 24 optical axis intersection be provided.The quantity of the birefringent layers that a slice in a pair of dextrorotation and the Left-hand circular polarization sheet is provided with equates with the quantity of the birefringent layers of another sheet, so a plurality of birefringent layers that each sheet of a pair of dextrorotation and Left-hand circular polarization sheet comprises are all providing the quarter-wave long delay in 200 to 1000nm part or all of wavelength coverage.
Can use suitable material to constitute the polaroid and the birefringent layers of each circular polarizing disk, available material is not particularly limited on kind, mentions in passing, and polaroid uses can the radiotransparency polarized light but absorb the suitable material of other light.The example of polarizer material comprises: the polarizing coating that obtains by the hydrophilic polymeric membrane that stretches; absorb the ethylene vinyl acetate copolymer film of iodine and/or the rear section saponification of dichromatic dyestuff and polarization film that obtains by above-mentioned mode and the protective seam that is provided with layer of transparent as polyvinyl alcohol film, the formalized polyvinyl alcohol film of part or by the hydrophilic high mol film, with one or two apparent surface of protection polarization film.
Protective clear layer can form with suitable polymkeric substance, and especially, protective clear layer preferably forms with the polymkeric substance with performances such as good transparency, physical strength, thermal stability and moisture seal.Transparent protective seam can form by suitable method, as the method for using polymer liquid or with the method for membraneous material bonding or lamination.
Mention in passing, the example of polymkeric substance comprises: cellulose-based polymer, as diacetyl cellulose and triacetyl cellulose; Polyester based polymer is as polyethylene terephthalate and PEN; Olefin-based polymer is as tygon, polypropylene, cyclic group or norborene structure polyolefins and ethylene-propylene copolymer; Amido polymer is as nylon and aromatic polyamide; The polycarbonate based polyalcohol, propenyl polymer is as polymethylmethacrylate; And styrene-based polymer, as polystyrene and vinyl cyanide/styrol copolymer.
The example that is used to form the polymkeric substance of protective clear layer also comprises: the imide polymkeric substance; the sulfuryl polymkeric substance; the polyethersulfone based polyalcohol; the polyetheretherketone based polyalcohol, polyphenylene sulfide based polyalcohol, vinyl alcohol based polyalcohol; allylic polymer; the polyoxymethylene based polyalcohol, the epoxy-based polymerization thing, mixture of polymers is mentioned in vinyl butyral and front.And the polymkeric substance that can pass through heating or uv radiation curing, as polyester based polymer, propenyl polymer, polyurethane-base polymkeric substance, amido polymer, silicone-based polymer, epoxy-based polymerization thing.Especially, preferably use a kind of on isotropic behavior extraordinary film such as triacetylcellulose film.
On the other hand, the example of various birefringent layers materials comprises: by refractive index each to orientation of different materials and fixing individual layer that obtains, by to isotropy or each to the stock of the same sex not be coated with complex index of refraction each to different materials and orientation and each multilayer that obtains to different materials of fixed refraction.Each example to different materials of refractive index comprises: liquid crystal material, and as the discotic liquid crystal polymer, nematic liquid crystal polymkeric substance, or high molecule liquid crystal and inorganic material.Another example of birefringent layers is the birefringent layers that is made of the film that is subjected to suitable directional process processing, as single shaft or the biaxial stretch-formed thin polymer film of using the polymkeric substance identical with forming protective clear layer to form.Another example of birefringent layers be its thickness direction transmissivity by when being bonded to heat-shrinkable film, providing convergent force or/and the birefringent layers that the thin polymer film that the method for tensile force is controlled constitutes.Birefringent layers preferably has good refractive index (transmittance).
Because the preferred birefringent layers of viewpoint of the delay change that stress causes is the light of 633nm for wavelength, its photoelastic coefficient is not more than 5 * 10 according to suppressing
-11m
2/ N generally is not more than 1 * 10
-11m
2/ N preferably is not more than 7 * 10
-11m
2/ N.The birefringent layers that the liquid crystal material of listing from above is made is preferably according to obtaining strain optical coefficient preferably, because generally the photoelastic coefficient of these birefringent layers is very little, the distortion of polaroid causes delay to change or the too little contrast that can not make of fast axle change reduces.In the film formed birefringent layers of polymer thin, alkenyl polymer, especially be only as norborene based polyalcohol, acetylcellulose based polyalcohol, polymethyl methacrylate base polymkeric substance etc., this is based on the birefraction of birefringent layers and the correlativity of wavelength, the photoelasticity of birefringent layers, and suppress birefringent layers and be used for the consideration of the strain optical coefficient of the boundary reflection that the difference of refractive index between the cementing agent of lamination causes.
For birefringent layers, the birefringent layers that the birefringent layers of quarter-wave long delay is provided and provides 1/2nd wavelength to postpone is used in combination.Birefringent layers is combined in wavelength and all provides quarter-wave delay in 200 to 1000nm part or all of scope.In this case, the birefringent layers that provides 1/2nd wavelength to postpone is arranged on polaroid and provides between the birefringent layers of quarter-wave long delay.The birefringent layers that provides 1/2nd wavelength to postpone can be made of one or more layers.Provide the number of plies in the birefringent layers that 1/2nd wavelength postpone generally to be not more than 4, especially be not more than 3, but also can be 5 or bigger.
The birefringent layers that constitutes circular polarizing disk can be formed or be formed by different materials by a kind of material.When birefringent layers is formed by a kind of material, the birefringence lamination that is used as 1/2nd retardation plates of relative some wavelength light can be combined with the birefringence lamination of the quarter-wave retardation plate that is used as relative these light, so two are stacked in and have same refractive index that depends on wavelength or birefraction on the dispersion characteristic.When birefringent layers was formed by different materials, the birefringence lamination can make up, and had different refractive index that depends on wavelength or birefraction on the dispersion characteristic so be stacked in.
Each birefringent layers can be made of the lamination of individual layer or a plurality of phase shift films to adjust the lag characteristic of birefringent layers.Under latter event, the phase shift films that will carry out lamination can be formed by a kind of material or material not of the same race respectively.Incidentally, 1/4th or 1/2nd wavelength that provided by each birefringent layers postpone and can control by suitable method, such as the material that changes each layer, and the thickness of layer and the method for the directed condition of each layer, or aforesaid laminating method.When the direction of the optical axis of birefringent layers changed, the slow axis of each birefringent layers or similar axle were always determined according to the mean square of optical axis.
Can form under the condition below in the birefringent layers combination that the quarter-wave long delay all is provided in 200 to 1000nm part or all of wavelength coverage as mentioned above, provide in the above-mentioned relatively wavelength coverage wavelength to postpone quarter-wave birefringent layers and at least one birefringent layers, particularly a plurality of birefringent layers of another wavelength delay 1/2nd wavelength in the relative wavelength scope carry out lamination with various combinations; Or the angle of the crossing is changed between the optical axis of birefringent layers.By the way, in the part or all of scope of above-mentioned wavelength, provide under the situation of birefringent layers combination of quarter-wave long delay, consider display characteristic, the part of this wavelength coverage preferably is not less than 200 to 50% of the wavelength coverage of 1000nm, especially be not less than 60%, preferably be not less than 70%.
A pair of circular polarizing disk according to the present invention is used with the array configuration of dextrorotation and Left-hand circular polarization sheet, and wherein a slice is provided with birefringent layers, and its quantity equals the quantity of the birefringent layers of another sheet.Each circular polarizing disk comprises polaroid, the birefringent layers of quarter-wave long delay and the birefringent layers that at least one provides 1/2nd wavelength to postpone is provided, so the optical axis and the optical axis intersection that the birefringent layers of quarter-wave long delay is provided of the birefringent layers of 1/2nd wavelength delay are provided.When two of a pair of circular polarizing disk are oppositely arranged, the birefringent layers that each sheet of a pair of circular polarizing disk comprises is that preface is discharged to the n layer from the ground floor numbering with the distance of distance polaroid, so the polaroid in a pair of circular polarizing disk lays respectively at the outside, the angle of the crossing between the fast axle of ground floor, the angle of the crossing between the fast axle of the second layer, ..., the angle of the angle of the crossing between the axis of homology of the angle of the crossing between the fast axle of n layer and the described polaroid of described a pair of circular polarizing disk is in the scope of 80 to 100 degree, particularly in the scope of 85 to 95 degree.Mention in passing, the cross reference between the cross reference between the fast axle of relative birefringent layers and the axis of homology of polaroid can be replaced by the cross reference between the absorption axes of cross reference between the slow axis of the birefringent layers of correspondence and polaroid.
Cross reference can as followsly obtain.For example, when θ 0 is the angle of absorption axes of polaroid, θ 1...... and θ (n-1) are all angles that the level number according to the birefringent layers arrangement provides the slow axis of the birefringent layers that 1/2nd wavelength postpone, θ n provides the angle of slow axis of the birefringent layers of quarter-wave long delay, circular polarizing disk forms according to following condition, promptly provide the birefringent layers that 1/2nd wavelength postpone slow axis angle and provide the angle of slow axis of the birefringent layers of quarter-wave long delay to determine by following expression formula 1 and 2 respectively.
Expression formula 1:
θ 0+2 * θ 1+......2 * θ (n-2)+θ (n-1) or
θ0-2×θ1-......2×θ(n-2)-θ(n-1)
Expression formula 2:
θ 0+2 * θ 1+......2 * θ (n-1)+45 degree or
θ 0-2 * θ 1-......2 * θ (n-1)-45 degree
Another circular polarizing disk forms according to following condition, after promptly the angular ranges of 80 to 100 degree are applied to the angle of retardation axis of each angle of absorption axes of polaroid and the birefringent layers on the circular polarizing disk, because the correction that produces of reversing will be added to each angle.
Incidentally,, in circular polarizing disk, provide the angle of the slow axis of the birefringent layers that 1/2nd wavelength postpone to calculate, be θ 0+ θ 1 or θ 0-θ 1 according to expression formula 1 when certain one deck during as the birefringent layers that provides 1/2nd wavelength to postpone.Therefore provide the angle of slow axis of the birefringent layers of quarter-wave long delay to calculate according to expression formula 2, be θ 0+2 * θ 1+45 degree or θ 0-2 * θ 1-45 degree.In this case, the angle θ 0 of the absorption axes of polaroid is arbitrarily, and angle θ 1 is preferably in the scope of 5 to 25 degree.
On the other hand, when two-layer during as the birefringent layers that provides 1/2nd wavelength to postpone, in polaroid, provide the angle of the slow axis of first and second birefringent layers that 1/2nd wavelength postpone to calculate according to expression formula 1 respectively, be θ 0+ θ 1 or θ 0-θ 1 (ground floor) and θ 0+2 * θ 1+ θ 2 or θ 0-2 * θ 1-θ 2 (second layer).Therefore provide the angle of slow axis of the birefringent layers (the 3rd) of quarter-wave long delay to calculate, be θ 0+2 * θ 1+2 * θ 2+45 degree or θ 0-2 * θ 1-2 * θ 2-45 degree according to expression formula 2.In this case, the angle θ 0 of the absorption axes of polaroid is arbitrarily, and angle θ 1 and θ 2 are preferably respectively in the scope and 10 to 30 scopes of spending of 5 to 15 degree.
In addition, when being used as the birefringent layers that the delay of 1/2nd wavelength is provided for three layers, the angle of the slow axis of first, second that provides in polaroid that 1/2nd wavelength postpone and the 3rd birefringent layers is calculated according to expression formula 1 respectively, be θ 0+ θ 1 or θ 0-θ 1 (ground floor), θ 0+2 * θ 1+ θ 2 or θ 0-2 * θ 1-θ 2 (second layer) and θ 0+2 * θ 1+2 * θ 2+ θ 3 or θ 0-2 * θ 1-2 * θ 2-θ 3 (the 3rd layer).Therefore provide the angle of slow axis of the birefringent layers (the 4th) of quarter-wave long delay to calculate, be θ 0+2 * θ 1+2 * θ 2+2 * θ 3+45 degree or θ 0-2 * θ 1-2 * θ 2-2 * θ 3-45 degree according to expression formula 2.In this case, the angle θ 0 of the absorption axes of polaroid is arbitrarily, and angle θ 1, θ 2 and θ 3 are preferably respectively in scope, 10 to 30 scopes of spending and 20 to 60 scopes of spending of 1 to 10 degree.
Incidentally, the polaroid in each circular polarizing disk and each birefringent layers can be simply one be placed on another, or according to preventing the optical axis displacement and what a is bonded to above another by the consideration of contamination by dust.Consider except that also improving the efficient of assembling liquid crystal indicator the quality, form each circular polarizing disk preferably by material is carried out whole lamination owing to preventing that the optical axis displacement from having stablized.
Bonding process can be undertaken by suitable method, as uses transparent cementing agent or tackifier.Kind to cementing agent has no particular limits.The preferred employing do not require that the high temperature heating process is cured and drying, do not require that the cementing agent of long-time curing and drying process changes with the optical characteristics that prevents polaroid and birefringent layers yet.In addition, preferably use has the cementing agent of the middle refractive index between the refractive index of the material that carries out lamination by cementing agent to suppress boundary reflection.
If necessary, adhesive layer can be arranged on each circular polarizing disk so that circular polarizing disk can be bonded on the main body by adhesive layer, as liquid crystal indicator.When adhesive layer is exposed to the surface, the exposed surface of adhesive layer can be temporarily with apply protection as covering by antipollution separator, drop into actual the use up to adhesive layer.When a kind of material that is used to form circular polarizing disk was exposed to the surface, the exposed surface of material can adhesively cover with surface protection film, made that material can be in order to avoid damage.
Can be used for various purpose according to correlation technique according to a pair of circular polarizing disk of the present invention.A pair of circular polarizing disk is preferably used in the liquid crystal indicator that formation can realize high-contrast, τ type for example, its utilized especially a kind of before delay be zero state substantially.Liquid crystal indicator can form in this way, and promptly a pair of dextrorotation and Left-hand circular polarization sheet 1 and opened the both sides that are arranged on liquid crystal display 3 in 2 minutes are so the polaroid 11 and 21 in a pair of circular polarizing disk 1 and 2 lays respectively at the outside, as shown in Figure 1.
Be arranged in above-mentioned mode at a pair of circular polarizing disk 1 and 2 under the situation of both sides of liquid crystal display 3, when the birefringent layers in a pair of circular polarizing disk 1 and 2 according to the distance of distance polaroid when the ground floor numbering is discharged to the n layer, birefringent layers in a pair of circular polarizing disk 1 and 2 and polaroid are arranged so that the angle of the crossing between the fast axle (slow axis) of ground floor 12 and 22, the angle of the crossing between the second layer 13 and 23 the fast axle (slow axis), the angle of the crossing between the 3rd layer 14 and 24 the fast axle (slow axis) ... the angle of the crossing between the fast axle (slow axis) of n layer, and in the scope of in 80 to 100 degree of the intersection angle position between the axis of homology of the polaroid in a pair of circular polarizing disk (absorption axes), particularly in the scope of 85 and 95 degree.By this set, can realize the demonstration of high-contrast.
According to the liquid crystal indicator of a pair of circular polarizing disk of use of the present invention can form a kind of disposed the transmissive liquid crystal display apparatus of back light unit or can dispose the reflection horizon overleaf form reflection LCD device.Liquid crystal indicator can become exterior light/illumination light coincidence type liquid crystal indicator in addition, and its side at liquid crystal display is provided with light source and at its back side the reflection horizon is set.In this case, formed liquid crystal indicator light illumination mode (transmission demonstration) can have down high-contrast and externally under the optical mode (reflection shows) scope at whole visible lights good display characteristic is all arranged.
Anti-dazzle photosphere or anti-reflection layer can be arranged on the surface of circular polarizing disk, and circular polarizing disk is provided with the viewable side of the liquid crystal display of liquid crystal indicator.Anti-dazzle photosphere is used to make the exterior light scattering of surface reflection.Anti-reflection layer is used to suppress the surface reflection of exterior light.By anti-dazzle photosphere or anti-reflection layer, prevented that surface reflection from becoming dazzle, dazzle can reduce the visuality by the light of display device transmission.Therefore, anti-dazzle photosphere or anti-reflection layer can be provided with simultaneously, can obtain bigger improvement aspect visual preventing that surface reflection from reducing like this.
Formed anti-dazzle photosphere or anti-reflection layer can have above-mentioned function and without any specific limited.Mention in passing, anti-dazzle photosphere can form the scabrid structure of surface detail of scattered reflection light.Anti-reflection layer can be by disturbing film to form, as the coated film of the different inorganic oxide of multilayer refractive index or the coated film that is formed by suitable coating process method by low-index material such as fluorine-based compound.The example of suitable coating method comprises: CVD (Chemical Vapor Deposition) method such as vacuum vapor deposition method, ion electroplating method or sputtering method, electrochemical plating and sol-gel process.
Reference example 1
Strain optical coefficient is 4.1 * 10 when having optical wavelength and being 633nm
-12m
2The norborene base resin film of (use equally this definition back) 100 micron thickness of/N (by the Arton film of JSR company manufacturing) stretches 50% under 175 ℃ temperature, therefore obtain providing λ/2 stretched film of 1/2nd wavelength delay, unit is that birefringent light is the light (use equally this definition back) of 550nm than wavelength.
Reference example 2
Same norborene base resin film stretches 25% in the mode identical with reference example 1, therefore obtains providing λ/4 stretched film of quarter-wave long delay.
Reference example 3
Have 8 * 10
-11m
2The polycarbonate membrane of 50 micron thickness of/N strain optical coefficient stretches 5% under 150 ℃ temperature, therefore λ/2 stretched film that provide 1/2nd wavelength to postpone are provided.
Reference example 4
Same polycarbonate membrane stretches 2.5% in the mode identical with reference example 3, therefore obtains providing λ/4 stretched film of quarter-wave long delay.
Example 1
The λ that obtains in reference example 1/2 stretched film and λ/4 stretched film that obtain in reference example 2 are laminated to together mutually by tack coat, so the optical axis of film (slow axis) is intersecting each other with angle 62.5 degree.Then, polaroid (NPF-HEG1425DU that Nitto Denko company makes) is laminated on λ/2 stretched film by adhesive layer.Therefore, obtain the right-hand circular polarization sheet.
When the absorption axes of polaroid was thought zero degree, the slow axis of λ/2 stretched film was 17.5 degree, and the slow axis of λ/4 stretched film is 80 degree.
On the other hand, by obtaining the Left-hand circular polarization sheet with above-mentioned same mode, except that all optical axises be arranged to above-mentioned light shaft positive cross.That is, when the absorption axes of polaroid thinks 90 when spending, the slow axis of λ/2 stretched film is 107.5 degree, and the slow axis of λ/4 stretched film is 170 degree.Incidentally, in each dextrorotation and the Left-hand circular polarization sheet, 200 to 1000nm the whole wavelength coverages of being stacked in of λ/2 stretched film and λ/4 stretched film provide the quarter-wave long delay.
Example 2
A pair of dextrorotation and Left-hand circular polarization sheet are by obtaining with the same mode of example 1, except λ/4 stretched film of each dextrorotation or Left-hand circular polarization sheet were replaced by λ/4 films, λ/4 films were to form and provide quarter-wave delay by orientation and fixing liquid crystal polymer.The strain optical coefficient of λ/4 films is 1 * 10
-11m
2/ N.In each dextrorotation and Left-hand circular polarization sheet, being stacked in from whole wavelength coverages of 200 to 1000nm of λ/2 stretched film and λ/4 stretched film provides the quarter-wave long delay.
Comparative example 1
A pair of dextrorotation and Left-hand circular polarization sheet are by obtaining with the same mode of example 1, difference is that resulting Left-hand circular polarization sheet makes, when the absorption axes of polaroid is considered to 90 when spending, the slow axis of the slow axis of λ/2 stretched film and λ/4 stretched film is respectively 17.5 and 80 degree, promptly the difference of Cun Zaiing be the axis of homology of polaroid be that zero degree or 90 is spent.
Comparative example 2
A pair of dextrorotation and Left-hand circular polarization sheet are by obtaining with the same mode of example 1, except adopted λ/2 stretched film that obtain and λ/4 stretched film that obtain in reference example 4 in reference example 3.
The assessment experiment
Example 1 and 2 and comparative example 1 and 2 in a pair of dextrorotation and the Left-hand circular polarization sheet that obtain be provided with relative to each other, when the absorption axes mutually orthogonal of polaroid, make the polaroid in a pair of dextrorotation and the Left-hand circular polarization sheet be separately positioned on the outside.In this case, assess the eye impressions of contrast and black display in the following method.
Contrast
Transmittance that the contrast basis obtains when the arrangement of a pair of dextrorotation and Left-hand circular polarization sheet is considered to black display and the transmittance that obtains when the combination of two right-hand circular polarization sheets is considered to the white demonstration are calculated.
The eye impressions of black display
The arrangement of a pair of dextrorotation and Left-hand circular polarization sheet obtains the eye impressions of black display by visual inspection evaluation.
The result who estimates shows in following table.
| Example 1 | Example 2 | Comparative example 1 | Comparative example 2 | |
| Contrast | 8,434 | 6,752 | 264 | 50 |
| The eye impressions of black display | Good | Good | Light leak and colour | Remarkable light leak |
Though the present invention is introduced by preferred form with certain singularity, should know under the situation that does not break away from the scope and spirit essence of declaring later of the present invention, can carry out the details of structure, the combination of parts and the change of layout disclosed preferred form.
Claims (2)
1. a pair of dextrorotation and Left-hand circular polarization sheet comprise:
Polaroid;
The birefringent layers of quarter-wave long delay is provided; With
The birefringent layers that at least one provides 1/2nd wavelength to postpone is arranged between described polaroid and the described birefringent layers that the quarter-wave long delay is provided; Described optical axis and the described optical axis intersection that the birefringent layers of quarter-wave long delay is provided that the birefringent layers of 1/2nd wavelength delay is provided,
Wherein, the described birefringent layers that a slice in described a pair of dextrorotation and left-handed circular polarizing disk is provided with quantitatively equates with the quantity of the described birefringent layers of another sheet, for wavelength is 200 part or all of wavelength in the 1000nm scope, and the birefringent layers that each sheet of described a pair of circular polarizing disk comprises all provides quarter-wave delay; When described a pair of circular polarizing disk is oppositely arranged, the birefringent layers that described each sheet of a pair of circular polarizing disk comprises is that preface is discharged to the n layer from the ground floor numbering with the distance of distance polaroid, the polaroid that described a pair of circular polarizing disk comprises lays respectively at the outside, the angle of the crossing between the fast axle of ground floor, the angle of the crossing between the fast axle of the second layer, ..., the angle of the angle of the crossing between the axis of homology of the angle of the crossing between the fast axle of n layer and the described polaroid of described a pair of circular polarizing disk is in the scope of 80 to 100 degree, it is characterized in that, for wavelength is the light of 633nm, and the strain optical coefficient of each described birefringent layers is not more than 1 * 10
-11m
2/ N.
2. liquid crystal indicator comprises:
Liquid crystal display; With
A pair of dextrorotation and the Left-hand circular polarization sheet that is limited by claim 1 separately is arranged on the opposite side of described liquid crystal cells, and the described polaroid that a pair of circular polarizing disk is comprised lays respectively at the outside;
Wherein, being arranged on the described birefringent layers that each sheet of described a pair of circular polarizing disk of the opposite side of described liquid crystal cells comprises is that preface is discharged to the n layer from the ground floor numbering with the distance apart from described refractor, the angle of the crossing between the fast axle of described ground floor, the angle of the crossing between the fast axle of the described second layer, ... the angle of the angle of the crossing is in the scope of 80 to 100 degree between the axis of homology of the angle of the crossing between the fast axle of described n layer and the described polaroid of described a pair of circular polarizing disk, it is characterized in that, for wavelength is the light of 633nm, and the strain optical coefficient of each described birefringent layers is not more than 1 * 10
-11m
2/ N.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP216147/2001 | 2001-07-17 | ||
| JP216147/01 | 2001-07-17 | ||
| JP2001216147A JP2003029039A (en) | 2001-07-17 | 2001-07-17 | Circularly polarizing plate and liquid crystal display device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1397809A CN1397809A (en) | 2003-02-19 |
| CN1266497C true CN1266497C (en) | 2006-07-26 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB021268770A Expired - Fee Related CN1266497C (en) | 2001-07-17 | 2002-07-17 | Circular polarizing disk and liquid crystal display |
Country Status (4)
| Country | Link |
|---|---|
| JP (1) | JP2003029039A (en) |
| KR (1) | KR100645664B1 (en) |
| CN (1) | CN1266497C (en) |
| TW (1) | TW581887B (en) |
Families Citing this family (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100410787C (en) * | 2003-03-14 | 2008-08-13 | 奇美电子股份有限公司 | Vertical nematic LCD device with multiple display zones by circular polarized light |
| JP4131838B2 (en) | 2003-05-16 | 2008-08-13 | 株式会社半導体エネルギー研究所 | Display device |
| TWI240119B (en) * | 2003-08-06 | 2005-09-21 | Optimax Tech Corp | Polarizer for multi-domain vertical alignment liquid crystal display |
| CN100338512C (en) * | 2003-09-11 | 2007-09-19 | 力特光电科技股份有限公司 | Polarizer of multi-domain vertical alignment LCD |
| JP4485184B2 (en) | 2003-12-15 | 2010-06-16 | 株式会社半導体エネルギー研究所 | LIGHT EMITTING DEVICE AND ELECTRONIC DEVICE |
| JP2005292781A (en) * | 2004-03-11 | 2005-10-20 | Fuji Photo Film Co Ltd | Optical compensation element, method for manufacturing the same, liquid crystal display device, and liquid crystal projector |
| JP4228973B2 (en) * | 2004-04-08 | 2009-02-25 | セイコーエプソン株式会社 | Liquid crystal display device and electronic device |
| JP4350052B2 (en) * | 2004-04-16 | 2009-10-21 | シャープ株式会社 | Circularly polarizing plate and liquid crystal display device |
| US7755707B2 (en) * | 2004-11-24 | 2010-07-13 | Koninklijke Philips Electronics N.V. | Display device |
| KR100840166B1 (en) * | 2005-02-25 | 2008-06-23 | 닛토덴코 가부시키가이샤 | Method of producing elliptically polarizing plate and image display apparatus using the elliptically polarizing plate |
| CN100410699C (en) * | 2005-05-25 | 2008-08-13 | 日东电工株式会社 | Optical film, liquid crystal panel, and liquid crystal display apparatus |
| JP2007004123A (en) | 2005-05-25 | 2007-01-11 | Nitto Denko Corp | Optical film, liquid crystal panel and liquid crystal display device |
| JP4731269B2 (en) * | 2005-10-06 | 2011-07-20 | 国立大学法人東北大学 | Polarizing element, liquid crystal panel, and liquid crystal display device |
| JP2017138401A (en) * | 2016-02-02 | 2017-08-10 | 大日本印刷株式会社 | Optical film and image display device |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3174367B2 (en) * | 1991-10-07 | 2001-06-11 | 日東電工株式会社 | Laminated wave plate and circularly polarizing plate |
| JP3410666B2 (en) * | 1998-07-16 | 2003-05-26 | シャープ株式会社 | Liquid crystal display |
-
2001
- 2001-07-17 JP JP2001216147A patent/JP2003029039A/en active Pending
-
2002
- 2002-07-16 KR KR1020020041694A patent/KR100645664B1/en not_active IP Right Cessation
- 2002-07-17 CN CNB021268770A patent/CN1266497C/en not_active Expired - Fee Related
- 2002-07-17 TW TW091115924A patent/TW581887B/en not_active IP Right Cessation
Also Published As
| Publication number | Publication date |
|---|---|
| CN1397809A (en) | 2003-02-19 |
| TW581887B (en) | 2004-04-01 |
| KR100645664B1 (en) | 2006-11-13 |
| JP2003029039A (en) | 2003-01-29 |
| KR20030007215A (en) | 2003-01-23 |
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