CN102667600B - TN liquid crystal element, and method for producing same - Google Patents
TN liquid crystal element, and method for producing same Download PDFInfo
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- CN102667600B CN102667600B CN201080058346.7A CN201080058346A CN102667600B CN 102667600 B CN102667600 B CN 102667600B CN 201080058346 A CN201080058346 A CN 201080058346A CN 102667600 B CN102667600 B CN 102667600B
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- AJKZIPCWVAURSI-UHFFFAOYSA-N carbamic acid;2-methylprop-2-enoic acid Chemical compound NC(O)=O.CC(=C)C(O)=O AJKZIPCWVAURSI-UHFFFAOYSA-N 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- OIWOHHBRDFKZNC-UHFFFAOYSA-N cyclohexyl 2-methylprop-2-enoate Chemical compound CC(=C)C(=O)OC1CCCCC1 OIWOHHBRDFKZNC-UHFFFAOYSA-N 0.000 description 1
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- 238000001035 drying Methods 0.000 description 1
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- HMZGPNHSPWNGEP-UHFFFAOYSA-N octadecyl 2-methylprop-2-enoate Chemical compound CCCCCCCCCCCCCCCCCCOC(=O)C(C)=C HMZGPNHSPWNGEP-UHFFFAOYSA-N 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
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- GRDVGGZNFFBWTM-UHFFFAOYSA-N phenyl 2-methylprop-2-eneperoxoate Chemical compound CC(=C)C(=O)OOC1=CC=CC=C1 GRDVGGZNFFBWTM-UHFFFAOYSA-N 0.000 description 1
- 229920001748 polybutylene Polymers 0.000 description 1
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Classifications
-
- 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
- G02F1/137—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 characterised by the electro-optical or magneto-optical effect, e.g. field-induced phase transition, orientation effect, guest-host interaction or dynamic scattering
- G02F1/139—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 characterised by the electro-optical or magneto-optical effect, e.g. field-induced phase transition, orientation effect, guest-host interaction or dynamic scattering based on orientation effects in which the liquid crystal remains transparent
- G02F1/1396—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 characterised by the electro-optical or magneto-optical effect, e.g. field-induced phase transition, orientation effect, guest-host interaction or dynamic scattering based on orientation effects in which the liquid crystal remains transparent the liquid crystal being selectively controlled between a twisted state and a non-twisted state, e.g. TN-LC cell
-
- 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
- G02F1/137—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 characterised by the electro-optical or magneto-optical effect, e.g. field-induced phase transition, orientation effect, guest-host interaction or dynamic scattering
- G02F1/13775—Polymer-stabilized liquid crystal layers
-
- 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
- G02F1/137—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 characterised by the electro-optical or magneto-optical effect, e.g. field-induced phase transition, orientation effect, guest-host interaction or dynamic scattering
- G02F1/139—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 characterised by the electro-optical or magneto-optical effect, e.g. field-induced phase transition, orientation effect, guest-host interaction or dynamic scattering based on orientation effects in which the liquid crystal remains transparent
- G02F1/1396—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 characterised by the electro-optical or magneto-optical effect, e.g. field-induced phase transition, orientation effect, guest-host interaction or dynamic scattering based on orientation effects in which the liquid crystal remains transparent the liquid crystal being selectively controlled between a twisted state and a non-twisted state, e.g. TN-LC cell
- G02F1/1397—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 characterised by the electro-optical or magneto-optical effect, e.g. field-induced phase transition, orientation effect, guest-host interaction or dynamic scattering based on orientation effects in which the liquid crystal remains transparent the liquid crystal being selectively controlled between a twisted state and a non-twisted state, e.g. TN-LC cell the twist being substantially higher than 90°, e.g. STN-, SBE-, OMI-LC cells
Landscapes
- Physics & Mathematics (AREA)
- Liquid Crystal (AREA)
- Nonlinear Science (AREA)
- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
Abstract
Provided is a TN liquid crystal element which is stable as a TN liquid crystal, and which has a fast response speed when being switched off. Also provided is a method for producing said TN liquid crystal element. The TN liquid crystal element is provided with: a pair of substrates, at least one of which is transparent, and which are arranged approximately in parallel; a pair of alignment films, the surface of which is subjected to alignment processing so that the liquid crystal molecules within a liquid crystal material would face the same direction, and which are disposed on the opposing surface in relation to the pair of substrates; and a liquid crystal layer which is disposed between the pair of alignment films, and which contains a liquid crystal material and a chiral agent. An angle (a) formed by the alignment processing direction of the pair of alignment films is 70 DEG to 110 DEG , and said alignment processing direction is a direction which forms a uniformed twist structure when the liquid crystal layer is twisted as much as the abovementioned angle (a). Moreover, an STN liquid crystal having a stable torsion angle of a+180 (DEG) in an electroless state is polymer-stabilized as a TN liquid crystal having a torsion angle of a (DEG).
Description
Technical field
The present invention relates to TN type liquid crystal cell and manufacture method thereof.
Background technology
In recent years, from the small sized product for portable phone to the large product for LCD TV, the market of liquid crystal cell expands gradually.
This liquid crystal cell is to have the so-called TN(Twisted Nematic of the structure of the orientation process direction distortion 90 degree of upper and lower base plate: twisted-nematic) be developed so far centered by type liquid crystal cell, but in the field at the special requirement such as large-scale tv visual angle, MVA(Multi domain Vertical Aligned: multizone homeotropic alignment), IPS(In Plane Switching: coplanar switch) etc. mode become main flow gradually.But TN mode has the advantages such as the change (gap (gap) deviation) of the change transmitance relative to liquid crystal cell (cell) thickness is few compared with other modes, can be used in the purposes that personal computer etc. is not strict with especially to visual angle.
And in recent years, TN type liquid crystal cell by with the combination being called as the blooming of view film (wideview film) that can expand TN type liquid crystal viewing angle, also can be used in the television applications of below 26 inch gradually, and in the LCD TV of less than 26 inches sizes, TN type liquid crystal accounts for 80%.
Usually, to the liquid crystal cell special requirement high-speed response for television applications.The response speed of TN type liquid crystal is represented by following formula (1), (2).
[mathematical expression 1]
At this, τ
onrepresent (never applying voltage status to the response the applying voltage status) response time of rising, τ
offrepresent (from applying voltage status to the response the not applying voltage status) response time that declines.
In addition, γ
1represent the rotary viscosity of liquid crystal material, ε
0represent permittivity of vacuum, Δ ε represents dielectric anisotropy, and d represents thickness of liquid crystal layer, and V represents applying voltage, V
threpresent threshold voltage, K represents the elastic modulus of liquid crystal material.In TN type liquid crystal, K=K
11-0.5K
22+ 0.25K
33, K
11, K
22, K
33represent the elastic modulus about bent (spray) deformation of exhibition, distortion (twist) deformation, bending (bend) deformation respectively.
Known to from above formula (1), because rising response speed depends on applying voltage, therefore high speed can be realized by executing alive applying method.Otherwise, because decline response speed does not rely on applying voltage, therefore can not high speed be realized based on signal voltage.For this reason, relative to rising response speed in liquid crystal cell, more require the high speed of decline response speed.
In order to realize decline response speed high speed, can be considered to reduce γ by above formula (2)
1(rotary viscosity), increase K(elastic modulus) etc. the improvement of material aspect, and reduce the thickness of d(liquid crystal layer) etc. the improvement of equipment aspect.Wherein about the thickness of liquid crystal layer, the situation of known TN type liquid crystal must meet Δ nd >=0.50(μm) (Δ n is the refraction guiding of liquid crystal material).If do not meet this condition, the transmitance of liquid crystal cell reduces.Because in available liquid crystal material, Δ n=0.25 is regarded as the limit, d=2(μm therefore can be thought) be the limit.About liquid crystal material, the limit is existed to the improvement of its rotary viscosity, elastic modulus.For this reason, from the relation of above formula (2), the decline response speed of TN type liquid crystal is difficult to there is larger improvement.
As the method do not showed in above formula (1), (2), there will be a known such as by adding the optically active substance being called as chirality (chiral) agent in liquid crystal material, thus reduce chirality pitch P and the ratio (p/d) of thickness of liquid crystal layer d, the method for raising decline response speed of liquid crystal material.About this method, there is following report up to now.
Patent documentation 1,2 discloses by thickness of liquid crystal layer being set as 0.5 μm ~ 3 μm, p/d value is set smaller than 15, thus realizes the technology of liquid crystal cell high speed.
Patent documentation 3 discloses at 0.25 < d/p < 1(i.e. 1 < p/d < 4) realize the technology of TN type liquid crystal high-speed in scope.Record from d/p=0.04(p/d=25 in this patent documentation 3) to d/p=1(p/d=1) the analogue value of decline response speed.In addition, the experimental data as reality records d/p=0.51(p/d=2.0) data.
The situation realizing decline response speed high speed when shortening the chirality pitch of liquid crystal material is described in patent documentation 4.Describe the tilt angle by increasing alignment films in addition, even if thus use short pitch liquid crystal material also can realize making the situation of 90 degree of twisted state stabilizations.Specifically, by tilt angle is set as 13.6 degree, even originally form the liquid crystal material of 210 degree of twisted states in liquid crystal cell, it also can be made to keep the twisted state of 90 degree.210 degree of twisted states are equivalent to p/d=1.7.
Describing in non-patent literature 1 in the liquid crystal layer of 12 μm of thickness, by the chirality pitch of liquid crystal material being foreshortened to 25 μm (p/d=2.1) from 70 μm (p/d=5), thus decline response speed being improved as the situation of 200ms by 400ms.
Prior art document
Patent documentation
Patent documentation 1: JP 2007-193362 publication
Patent documentation 2: JP 2008-176343 publication
Patent documentation 3: JP 2003-161962 publication
Patent documentation 4: JP 2000-199901 publication
Non-patent literature
Non-patent literature 1:S.Aftergut and H.S.Cole Jr., J.Appl.Phys.Lett., 30 (8), P.363, (1977)
Shi Jingsong Pu, ship field, non-patent literature 2: Shen Qishi village, Sharp's skill report, 39(35), (1988)
Summary of the invention
The technical matters that invention will solve
As mentioned above, the high speed of decline response speed can be realized by reducing p/d value.But there will be a known when liquid crystal layer twist angle is α (degree), if carry out short pitchization, twist angle changes α+180(degree into) situation of (with reference to non-patent literature 2).For this reason, when twist angle is the TN type liquid crystal of 90 degree, if carry out short pitchization, form the STN(SuperTwited Nematic that twist angle is 270 degree: supertwist is to row) type liquid crystal.In addition, in non-patent literature 2, p/d=2 is lower limit.
Above-mentioned patent documentation 3 records the analog result of the liquid crystal cell of 1 < p/d < 4 scope, but this is only the result of analog computation instead of the result of actual measurement.As actual measured value, minimum value is p/d=2.0.
At this, described in above-mentioned patent documentation 4, by increasing the tilt angle of alignment films, even if thus use short pitch liquid crystal material also can realize the stabilization of 90 degree of twisted states.But even if increase tilt angle, also there is the limit in the p/d value that can realize, even if also disclose only p/d=1.7 in patent documentation 4.In addition, the TN type liquid crystal of this state is envisioned as unstable liquid crystal, even if be considered to be formed also can due to temperature variation, apply stress, vibration etc. and to STN type liquid crystalline transition.
In view of above-mentioned technical matters, object of the present invention is for providing a kind of TN type liquid crystal cell and manufacture method thereof, and its TN type mesomorphic state is stablized, and achieves the high speed of decline response speed.
The means of technical solution problem
For solving the problems of the technologies described above, present inventor furthers investigate.It found that, even to reduce p/d value be then the TN type liquid crystal phase of α (degree) with twist angle is α+180(degree than twist angle) the more stable situation of STN type liquid crystal, under STN type Formation of liquid crystals opens up the condition of bent structure, if apply voltage, open up bent structure and be eliminated, thus temporarily remain on the state that twist angle is α (degree).And find by adding photo-curable monomer in liquid crystal material, and make photo-curable monomer cure temporarily being formed under the state that twist angle is α (degree), polymer-stabilized at twist angle α (degree) of liquid crystal layer can be realized.Complete the present invention based on above-mentioned opinion, description of contents is as follows more specifically.
(1) a TN type liquid crystal display cells, is characterized in that, comprising: a group substrate, the almost parallel configuration of a described group substrate and at least one of them is transparent; One group of alignment films, described one group of alignment films is arranged at the opposite face of a described group substrate, and orientation process has been carried out on surface, points to equidirectional to make the liquid crystal molecule in liquid crystal material; And liquid crystal layer, described liquid crystal layer is configured between described one group of alignment films, and comprise liquid crystal material and chiral agent, the angle α formed in the orientation process direction of described one group of alignment films is 70 degree to 110 degree, and described orientation process direction forms even twist structured direction when being the angle α when being formed described in described liquid crystal layer distortion, be that the STN type liquid crystal polymer that α+180 spends is stablized and turned to the TN type liquid crystal that twist angle is α degree without twist angle stable under electric field status.
(2) the TN type liquid crystal display cells according to above-mentioned (1), it is characterized in that, in same liquid crystal display cells, the free energy of twist angle to be the free energy of STN type liquid crystal that α+180 spends than twist angle the be TN type liquid crystal of α degree is low, and described liquid crystal layer achieves polymer-stabilized at twist angle α degree.
(3) the TN type liquid crystal display cells according to above-mentioned (1) or (2), is characterized in that, when set the thickness of described liquid crystal layer as the chirality pitch of d, described liquid crystal material be p time, 0.5≤p/d≤1.6.
(4) the TN type liquid crystal display cells according to any one of above-mentioned (1) to (3), is characterized in that, the tilt angle of described alignment films is less than 5 degree.
(5) manufacture method for TN type liquid crystal display cells, is characterized in that, comprising: the operation forming alignment films on a respective surface of at least one of them transparent group substrate, orientation process is carried out with the operation making the liquid crystal molecule in liquid crystal material point to equidirectional to the surface of described one group of alignment films, the operation of a described group substrate is configured in the mode that described one group of alignment films is relative, between described one group of alignment films, filling bag contains the liquid crystal material of chiral agent and photo-curable monomer thus the operation of formation liquid crystal layer, alive operation is executed between a described group substrate, and stop or making after minimizing applying voltage the operation of described photo-curable monomer photocuring, the angle α formed in the orientation process direction of described one group of alignment films is 70 degree to 110 degree, and described orientation process direction forms even twist structured direction when being the angle α when being formed described in described liquid crystal layer distortion, describedly execute in alive operation, after making described liquid crystal layer be in vertical orientated state by applying voltage, stop or reducing applying voltage, thus make described liquid crystal layer temporarily by the TN type liquid crystalline transition of twist angle to be STN type liquid crystal that α+180 spends to twist angle be α degree, in described photocuring operation, by making described photo-curable monomer photocuring, thus make described liquid crystal layer realize polymer-stabilized at twist angle α degree.
(6) manufacture method of the TN type liquid crystal display cells according to above-mentioned (5), is characterized in that, when set the thickness of described liquid crystal layer as the chirality pitch of d, described liquid crystal material be p time, 0.5≤p/d≤1.6.
Invention effect
According to the present invention, can provide a kind of TN type mesomorphic state stable and realize TN type liquid crystal display cells and the manufacture method thereof of decline response speed high speed.
Accompanying drawing explanation
Fig. 1 is the figure of an example of the manufacture method that TN type liquid crystal cell involved in the present invention is shown.
Fig. 2 is the figure erecting direction schematically showing orientation process direction and liquid crystal molecule.
Fig. 3 is the figure of the appearance schematically showing the left aligned twisted of liquid crystal molecule.
Fig. 4 is the figure of the appearance schematically showing the right aligned twisted of liquid crystal molecule.
Fig. 5 is the response time τ that declines when the chirality pitch changing liquid crystal material is shown
offthe figure of analog result.
Fig. 6 is the figure in the orientation process direction that upper and lower alignment films in embodiment 1 is shown.
The figure of the liquid crystal layer change that Fig. 7 observes when being and illustrating and apply voltage to the liquid crystal cell of preparation in embodiment 1.
Fig. 8 illustrates five TN type liquid crystal cells (element 1 ~ 5) about preparation in embodiment 1, and decline when applying the state incision power-off pressure of V10 voltage for 25 DEG C response time τ
offmeasurement result box traction substation.
Fig. 9 illustrates five TN type liquid crystal cells (element 1 ~ 5) about preparation in embodiment 1, the moment of 20ms make it be in apply V50 voltage status, make it be in not apply voltage status in the moment of 520ms time transmitance the figure of time variations.
Figure 10 amplifies the figure illustrated in Fig. 9 from the moment of 510ms to the moment of 570ms.
Figure 11 illustrates five TN type liquid crystal cells (element 1 ~ 5) about preparation in embodiment 1, and decline when applying the state incision power-off pressure of V10 voltage for-20 DEG C response time τ
offmeasurement result box traction substation.
Embodiment
Below, with reference to accompanying drawing, the specific embodiment of the present invention is described in detail.
Below first the liquid crystal material forming liquid crystal layer is described, then the manufacture method of TN type liquid crystal cell involved in the present invention is described, finally TN type liquid crystal cell involved in the present invention is described.
[liquid crystal material]
The liquid crystal material forming liquid crystal layer in the present invention comprises chiral agent and photo-curable monomer.
Use nematic crystal as liquid crystal material.Though its kind is not particularly limited, consider the foregoing formula about decline response speed (2), then the liquid crystal material that preferably rotary viscosity is lower, elastic modulus is larger.
Be not particularly limited as chiral agent, can use existing known chiral agent.No matter which kind of Dou Shi Merck company manufactures can to list S-811, R811, CB-15, MLC6247, MLC6248, R1011, S1011(as an example) etc.By adjusting the content of above-mentioned chiral agent, the chirality pitch of liquid crystal material can be adjusted.
Be not particularly limited as photo-curable monomer.Can list as an example: β-dimethyl-aminoethylmethacrylate, butyl methacrylate, methacrylic acid-2-Octyl Nitrite, EHMA, lauryl methacrylate, octadecyl methacrylate, the different myristyl ester of methacrylic acid (isomyristyl methacrylate), methacrylic acid isooctadecane base ester (isostearylmethacrylate), methoxyethyl methacrylate, ethoxyethyl methacrylates, methacrylic acid methyl carbitol ester (methyl carbitol methacrylate), methacrylic acid ethyl carbitol ester (ethyl carbitol methacrylate), cyclohexyl methacrylate, isobornyl methacrylate, 2-hydroxyethyl methacry-late, methacrylic acid phenoxy group ester (phenoxy methacrylate), methoxyl dipropylene glycol methyl acrylate (methoxy dipropylene glycol methacrylate), trifluoroethyl methacrylate, dimethylamino methyl acrylate (dimethylamino methacrylate), methacrylic acid [2-(4-morpholinyl) ethyl] ester, perfluoroalkyl methacrylate, polyethylene glycol dimethacrylate, polypropylene glycol dimethacrylate, polytetramethylene glycol dimethylacrylate (polybutylene glycol dimethacrylate), aliphatics dimethylacrylate, epoxychloropropane modified HDDMA, dicyclopentenyl dimethylacrylate (dicyclopentenyl dimethacrylate), bisphenol a dimethacrylate, epoxychloropropane modified bisphenol a dimethacrylate, ethylene-oxide-modified bisphenol a dimethacrylate, epoxy pronane modification bisphenol a dimethacrylate, epoxy butane modified bisphenol A dimethylacrylate, dimethacrylate 3,3-dihydroxymethyl pentyl ester (3,3-dimethylol pentane dimethacrylate), dimethacrylate 3,3-dihydroxymethyl heptyl ester (3,3-dimethylol heptane dimethacrylate), caprolactone modification dipentaerythritol hexamethacrylate, pentaerythritol acrylate trimethyl, pentaerythritol tetramethylacrylate, dipentaerythritol tetramethyl acrylate, dipentaerythritol hexamethacrylate, methacrylic acid carbamate, N,N-DMAA, N, N-dimethylaminopropylacryl acid amides etc.
In addition, the material of liquid crystal liquid crystal property is preferably presented as photo-curable monomer.Such as Unexamined Patent 8-3111 publication, JP 2000-178233 publication, JP 2000-119222 publication, JP 2000-327632 publication, JP 2002-220421 publication, JP 2003-55661 publication, JP 2003-12762 publication etc. are documented in about the photo-curable monomer presenting liquid crystal liquid crystal property.
The content of photo-curable monomer is different from the difference of the kind of photo-curable monomer and the tilt angle of alignment films, is preferably 0.1 quality % to 15 quality % relative to liquid crystal material, is more preferably 0.5 quality % to 10 quality %.By content is set as more than 0.1 quality %, polymer-stabilized effect described later fully can be obtained.In addition, by content is set as below 15 quality %, the driving voltage of liquid crystal cell can be suppressed to increase and contrast decline.
[manufacture method of TN type liquid crystal cell]
Liquid crystal cell manufacture method involved in the present invention, is characterized in that, comprising: the operation forming alignment films on a respective surface of at least one of them transparent group substrate, orientation process is carried out with the operation making the liquid crystal molecule in liquid crystal material point to equidirectional to the surface of described one group of alignment films, the operation of a described group substrate is configured in the mode that described one group of alignment films is relative, between described one group of alignment films, filling bag contains the liquid crystal material of chiral agent and photo-curable monomer thus the operation of formation liquid crystal layer, alive operation is executed between a described group substrate, and stop or making after minimizing applying voltage the operation of described photo-curable monomer photocuring, wherein, the angle α formed in the orientation process direction of described one group of alignment films is 70 degree to 110 degree, and described orientation process direction forms even twist structured direction when being the angle α when being formed described in described liquid crystal layer distortion, describedly execute in alive operation, after making described liquid crystal layer be in vertical orientated state by applying voltage, stop or reducing applying voltage, thus make described liquid crystal layer temporarily by the TN type liquid crystalline transition of twist angle to be STN type liquid crystal that α+180 spends to twist angle be α degree, in described photocuring operation, by making described photo-curable monomer photocuring, thus make described liquid crystal layer realize polymer-stabilized at twist angle α degree.
Below, be suitably described in detail with reference to the example of Fig. 1 to the manufacture method of TN type liquid crystal cell involved in the present invention.The figure shown in each step is resolved into by Fig. 1 in the manufacturing process of TN type liquid crystal cell.
First, the surface (step S10, S11) of also dry at least one of them transparent group substrate is cleaned.Then, by coating polyimide on a respective surface of an above-mentioned group substrate, and dry, burn till and form alignment films (polyimide film) (step S12, S13).Then, each alignment layer surface is rubbed (rubbing) process (orientation process), points to equidirectional (step S14) to make liquid crystal molecule in liquid crystal material.
What Fig. 2 schematically showed orientation process direction and liquid crystal molecule erects direction.After carrying out orientation process to the surface of alignment films 100, the liquid crystal molecule 101 of alignment layer surface, comprising in figure in the direction of orientation process shown in arrow and the face perpendicular to the direction of alignment films 100, tilts to erect certain angle θ relative to this orientation process direction.This angle θ is called as tilt angle.
In the present invention, the tilt angle of alignment films is preferably less than 5 degree.By tilt angle being set as less than 5 degree can realize decline response speed high speed.
Then by the base-plate cleaning after friction treatment, dry rear (step S15), scatter sept (spacer) (step S16).Then seal (seal) agent in the coating of substrate periphery and make its drying (step S17).Now, the inlet and the exhausr port that are formed for injecting liquid crystal material is reserved when sealing.
Then by after an above-mentioned group substrate assembling (step S18), heated sealant agent makes it solidify, and the peripheral part of encapsulated liquid crystals element (step S19).An above-mentioned group substrate is configured in the mode making one group of above-mentioned alignment films relative during assembling.Wherein, the angle α formed in the orientation process direction of two alignment films is 70 degree to 110 degree.If the angle α formed is less than 70 degree or be greater than 110 degree, then there is light leak during black display and reduce contrast.In addition, during black display, along with direction of observation different light leak (Guang order け) increase.In addition, by formed angle α being set as 80 degree to 100 degree can be improved contrast/view angle dependency further.
Further, even twist structured direction is formed when the orientation process direction of two alignment films is angle α when liquid crystal layer distortion is above-mentioned formed.
At this, consider the situation to being filled with liquid crystal material between the angle α formed in orientation process direction is one group of alignment films of 90 degree.In Fig. 3, liquid crystal molecule 112 tilts to erect pretilt theta from upper alignment films 110 and lower alignment films 111.Then, under the state that remain this pretilt theta between upper and lower alignment films, liquid crystal molecule is from upper alignment films 110 alignment films 111 right side (clockwise) distortion 90 degree downwards ground arrangement.
On the other hand, in Fig. 4, liquid crystal molecule 122 tilts to erect pretilt theta from upper alignment films 120 and lower alignment films 121.Then polar angle (angle formed between liquid crystal molecule and the alignment films) consecutive variations by tilt angle of liquid crystal molecule between upper and lower alignment films, and be θ in upper alignment films, becoming 0 degree (with substrate-parallel) at central portion, is θ in lower alignment films.With substrate vertical direction on along with this distortion, arrange from alignment films 111 left side (counterclockwise) distortion 90 degree downwards of upper alignment films 110 simultaneously.Structure is as shown in Figure 4 called as the bent structure of exhibition.
The bent structure of exhibition shown in Fig. 4 is due to liquid crystal molecule also distortion in the vertical direction, and therefore free energy is high.Thus at liquid crystal material not containing chiral agent and when not having intrinsic distortion, liquid crystal material is right distortion 90 degree spontaneously.In addition, add to liquid crystal material and bring out in the situation of the chiral agent of right distortion, also right distortion 90 degree as shown in Figure 3.
That is, if orientation process direction as shown in Figure 3, then do not form the bent structure of exhibition when the angle α that above-mentioned liquid crystal material distortion is above-mentioned formed and form uniform distorted-structure.On the other hand, when using liquid crystal material same as described above the orientation process direction of one of them is contrary in upper and lower alignment films, then form the bent structure of exhibition.In addition, if orientation process direction as shown in Figure 3, then when the chiral agent of left distortion is brought out in interpolation in liquid crystal material, the bent structure of exhibition is also formed.
In addition, in orientation process direction as shown in Figure 3, if bring out the chiral agent of right distortion by such as interpolation and make the twist angle of liquid crystal material become 270 degree, then the bent structure of exhibition is formed.
Then, between one group of above-mentioned alignment films, inject the liquid crystal material comprising above-mentioned chiral agent and photo-curable monomer and form liquid crystal layer (step S20), afterwards by inlet and exhausr port sealing (step S21).As mentioned above, the content by adjusting chiral agent can adjust the chirality pitch of liquid crystal material.In order to realize decline response speed high speed in the present invention, preferably the ratio (p/d) of the chirality pitch P of liquid crystal material and thickness of liquid crystal layer d being set as 0.5≤p/d≤1.6, being more preferably set as 1.0≤p/d≤1.6.
At this, in the present invention, twist angle is α+180(degree) STN type liquid crystal without stable under electric field status.That is, in same liquid crystal display cells, twist angle is α+180(degree) the free energy of STN type liquid crystal to be in than twist angle be the state that the free energy of the TN type liquid crystal of α (degree) is low.
" same liquid crystal display cells " refers to the element that all key elements of having an impact to the performance of liquid crystal material and the liquid crystal cell such as chirality pitch, thickness of liquid crystal layer or aligning film material, frictional direction, frictional strength thereof are all identical.
And, " twist angle is α+180(degree) the free energy of STN type liquid crystal be that the free energy of the TN type liquid crystal of α (degree) is low than twist angle " is although refer to not only have that to form TN type liquid crystal that twist angle is α (degree) but also there is formation twist angle be α+180(degree) the situation of STN type liquid crystal, twist angle is α+180(degree) the free energy of STN type liquid crystal compare lower.Wherein, because proper free energy is difficult to calculate, therefore " free energy of STN type liquid crystal is compared lower " refers to: in particular by room temperature placing, from TN type liquid crystal to the situation of STN type liquid crystalline transition after experience a period of time (several seconds is to a few hours).
As mentioned above, when p/d value is set as 0.5≤p/d≤1.6 scope, from TN type liquid crystal to STN type liquid crystalline transition (if needed, with reference to non-patent literature 2) after experience a period of time.This is due to the free energy of the STN type liquid crystal cause lower than the free energy of TN type liquid crystal.That is, 0.5≤p/d≤1.6 scope is the state of " in same liquid crystal display cells, twist angle is α+180(degree) the free energy of STN type liquid crystal be that the free energy of the TN type liquid crystal of α (degree) is low than twist angle ".
Then to applying voltage (step S22) between substrate.Specifically, apply voltage and make after liquid crystal layer becomes vertical orientated state, make by stopping or reducing applying voltage liquid crystal layer temporarily from twist angle be α+180(degree) STN type liquid crystal be the TN type liquid crystalline transition of α (degree) to twist angle.In addition, minimizing degree during voltage is reduced, as long as low to enough making liquid crystal layer be changed to the twisted state that twist angle is α (degree) by vertical orientated state.
As mentioned above, because twist angle in same liquid crystal display cells is α+180(degree in the present invention) the free energy of STN type liquid crystal to be in than twist angle be the state that the free energy of the TN type liquid crystal of α (degree) is low, from TN type liquid crystal to STN type liquid crystalline transition after therefore experiencing a period of time.But, by applying voltage more sufficiently high than saturation voltage, can temporarily make it from STN type liquid crystal to TN type liquid crystalline transition.Can this is presumably because that liquid crystal layer forms the bent structure of exhibition in STN type mesomorphic state, but by applying to make the bent structure of exhibition eliminate thus form uniform distorted-structure than the sufficiently high voltage of saturation voltage.
The voltage applied is different along with the kind etc. of liquid crystal material, 1.5 ~ 5 times of preferably saturation voltage.And application time was preferably tens of second to several minutes.
Then, by carrying out photocuring to the photo-curable monomer irradiation ultraviolet radiation in liquid crystal material, and polymer-stabilized (the step S23) of liquid crystal layer at twist angle α (degree) is realized.Due to this polymer-stabilized, even if as mentioned above p/d value to be set as the situation of 0.5≤p/d≤1.6 scope, also can suppress from TN type liquid crystal to STN type liquid crystalline transition.
In addition, liquid crystal layer keeps twist angle to be that time of the twisted state of α (degree) is different along with the kind of liquid crystal material and the tilt angle of alignment films.Because twist angle is that the TN type liquid crystal of α (degree) becomes more stable when tilt angle increases, twist angle is therefore kept to be the time lengthening of the twisted state of α (degree).
[TN type liquid crystal cell]
The feature of TN type liquid crystal cell involved in the present invention is, comprising: a group substrate, the almost parallel configuration of a described group substrate and at least one of them is transparent; One group of alignment films, described one group of alignment films is arranged at the opposite face of a described group substrate, and orientation process has been carried out on surface, points to equidirectional to make the liquid crystal molecule in liquid crystal material; And liquid crystal layer, described liquid crystal layer is configured between described one group of alignment films, and comprise liquid crystal material and chiral agent, wherein, the angle α formed in the orientation process direction of described one group of alignment films is 70 degree to 110 degree, and described orientation process direction forms even twist structured direction when being the angle α when being formed described in described liquid crystal layer distortion, the STN type liquid crystal being α+180 degree without twist angle stable under electric field status achieves polymer-stabilized, becomes the TN type liquid crystal that twist angle is α degree.
Due to the product that this TN type liquid crystal cell is by the manufacture of above-mentioned TN type liquid crystal cell manufacture method, therefore omit its detailed description.
Owing to the p/d value of this TN type liquid crystal cell can be set as 0.5≤p/d≤1.6 scope, therefore decline response speed high speed can be realized compared with common TN type liquid crystal cell.
At this, use Liquid Crystal Molecules Alignment simulator LCD Master(Shintec Inc.) analog result be shown in Fig. 5.Fig. 5 illustrates to use liquid crystal material ZL1-4792(Merck Inc.) parameter, alignment films tilt angle is set as 20 degree, distance (i.e. thickness of liquid crystal layer) between alignment films is set as 5 μm, decline response time τ when making the chirality pitch variation of liquid crystal material
offthe figure of change.Above-mentioned τ
offbe from 50% of the transmitance reached when not applying voltage transmittance time applying voltage status cut off voltage and be 0V, transmittance when not applying voltage is set as 100, and when 50% transmitance is set as 0, transmitance is changed to the time required for 90 from 10.Known to from Fig. 5, the less response time τ that then declines of the chirality pitch of liquid crystal material
offshorter.Be appreciated that by p/d value being set as prior art once unapproachable 0.5≤p/d≤1.6 scope thus, thus compared with prior art realize the decline response speed high speed of liquid crystal cell, improve animated characteristics.
Embodiment
Below, embodiments of the invention are described, but scope of the present invention is not by the restriction of these embodiments.
[embodiment 1, comparative example 1]
The glass substrate of 2cm × 2cm × 1.1cm size is formed the transparency electrode of 1cm × 1cm and the electrode part for electrode being directed to outside.That ready glass substrate like this applies about 1 μm of thickness, that liquid crystal orientation film polyimide PIA-x768-01x and PIA-x359-01x of Chisso petrochemistry Inc. mixes with the ratio of 45:55 potpourri, thus form alignment films.Kapok throwing flannelette is used to carry out friction treatment to this alignment films.Friction treatment direction (orientation process direction) is according to direction shown in Fig. 6.In addition, the tilt angle of alignment films is 21 degree.
Then, an alignment films is scattered silicon dioxide sept (the HIPRESICA(Ha イ プ シ カ) UF 5 microns of diameter 5 μm wherein, day east, space portion changes into Inc.) after at periphery coating epoxies sealant, and heating makes it solidification for 1 hour at 150 DEG C.Two holes are produced as the inlet for injecting liquid crystal material and exhausr port during sealing.
Then, in the space sealed by epoxies sealant, liquid crystal material is injected.Liquid crystal material modulated process is as follows: to making chirality pitch left-handed by adding chiral agent and being adjusted to the ZLI-4792US123(Merck Inc. of 7.5 μm) 475mg adds photo-curable monomer UCL-003(DIC Inc.) after 27mg, make the upper heating of the electric hot plates of 100 DEG C (hot plate) 3 minutes.It is long that this liquid crystal material has the left-handed pitch of 7.5 μm.I.e. p/d=1.5.This liquid crystal material is contacted with inlet, utilizes capillarity to be injected in whole liquid crystal cell by liquid crystal material.
After injecting liquid crystal material, Slow cooling also uses polarized light microscope observing liquid crystal aligning state, and the orientation observing liquid crystal is all identical.Two panels Polarizer is assembled into and absorbs the orthogonal so-called cross-polarized light plate (crossed Nichol) of axle, when to be configured in by liquid crystal cell between two panels Polarizer in the mode parallel with frictional direction through axle of Polarizer and to observe, observe integral colouring for blue.Liquid crystal layer between the substrates distortion 90 degree time, should not occur painted in this observation and form white states.Therefore can think that this state is the state of liquid crystal layer distortion 270 degree between the substrates.
Then, the square wave of the electrode applying 20V of liquid crystal cell is made liquid crystal layer form vertical orientated state and keeps this state 5 minutes.When with the change of polarized light microscope observing during this, observe liquid crystal arrangement and gently occur point-like liquid crystal arrangement ((b) of Fig. 7) different with it from uniform state ((a) of Fig. 7).Then this liquid crystal arrangement expands ((c), (d) of Fig. 7) gradually, finally forms the liquid crystal arrangement ((e) of Fig. 7) of all identical new generation.Can think that this change is is occur in the STN type mesomorphic state of 270 degree that twist angle is the result of the TN type mesomorphic state of 90 degree at twist angle.
In order to determine this imagination, two panels Polarizer is assembled into cross-polarized light, when liquid crystal cell to be configured between two panels Polarizer in the mode parallel with frictional direction through axle of Polarizer and to observe, before finding to apply voltage, integral colouring is blue, does not observe painted owing to applying voltage in the liquid crystal arrangement produced on the other hand.Before determining to apply voltage thus, liquid crystal arrangement corresponds to the STN type liquid crystal that twist angle is 270 degree, and the liquid crystal arrangement produced owing to applying voltage corresponds to the TN type liquid crystal that twist angle is 90 degree.
Stopping applying after voltage at once via Longlife(registered trademark) optical filter (SPECTROLINE Inc.) irradiates the ultraviolet of 5 minutes 365nm wavelength, makes photo-curable monomer photocuring.Placed 30 days under former state state after Ultraviolet radiation, still maintenance twist angle is the TN type mesomorphic state of 90 degree.In addition, though not shown concrete data, but even if stop applying non-irradiation ultraviolet radiation after voltage, if several minutes then still keep twist angle to be the TN type mesomorphic state of 90 degree to a few hours.
The TN type liquid crystal cell of five embodiments 1 is prepared into according to said method.
Further, except not adding except chiral agent and photo-curable monomer in liquid crystal material, all the other are prepared into the TN type liquid crystal cell of five comparative examples 1 similarly to Example 1.
About each five TN type liquid crystal cells of the embodiment 1 be prepared into, comparative example 1, use liquid crystal cell photoelectric characteristic measurement mechanism LCD5200( great mound electronics corporation system) decline response time when obtaining 25 DEG C.Specifically, with transmittance when not applying voltage status be 100%, be 0% with the transmittance of cross-polarized light plate time, for applying voltage V50, V10 of the transmittance of acquisition 50%, 10%, measure response time (τ when cutting off voltage from the applying voltage status of V50, V10
off).This τ
offbe when be 100% with transmittance when not applying voltage status, be 0% with transmittance during each applying voltage time, transmittance changes to the time required for 90% from 10%.Mean value and the 2 σ values of the measured value of each five TN type liquid crystal cells are shown in following table 1.In addition, measured value when applying voltage V10 is shown in the box traction substation of Fig. 8.
[table 1]
Known to from table 1 and Fig. 8, add chiral agent and make p/d=1.5 thus the TN type liquid crystal cell realizing polymer-stabilized embodiment 1 under the TN type mesomorphic state being 90 degree at twist angle with do not add chiral agent and photo-curable monomer comparative example 1 TN type liquid crystal cell compared with, decline response speed significantly realizes high speed.
About in embodiment 1 preparation five TN type liquid crystal cells (element 1 ~ 5), the applying voltage status being V50 with the moment of 20ms, with the moment of 520ms for do not apply voltage status time, the time variations of transmitance when 25 DEG C is shown in Fig. 9.In addition, sloping portion (from the moment of 510ms to the moment of the 570ms) amplification of Fig. 9 is shown in Figure 10.
Known to from Fig. 9,10, the response characteristic rise, declined has repeatability.And be situation at a high speed according to response speed, TN type mesomorphic state is fixed.
In addition, about each five TN type liquid crystal cells of the embodiment 1 be prepared into, comparative example 1, liquid crystal cell photoelectric characteristic measurement mechanism LCD5200( great mound electronics corporation system is used) decline response time when obtaining-20 DEG C.Specifically, response time (τ when cutting off voltage from the applying voltage status of V10 is measured
off).Mean value and the 2 σ values of the measured value of each five TN type liquid crystal cells are shown in following table 2.In addition, measured value when applying voltage V10 is shown in the box traction substation of Figure 11.
[table 2]
Known to from table 2 and Figure 11, even under the low temperature of-20 DEG C, add chiral agent and make p/d=1.5 thus the TN type liquid crystal cell realizing polymer-stabilized embodiment 1 under the TN type mesomorphic state being 90 degree at twist angle with do not add chiral agent and photo-curable monomer comparative example 1 TN type liquid crystal cell compared with, decline response speed also significantly realizes high speed.
[embodiment 2]
Except the tilt angle of alignment films is set as 3 degree, photo-curable monomer UCLA-003(DIC Inc.) addition be set as 52.8mg except, all the other are prepared into the TN type liquid crystal cell of five embodiments 2 similarly to Example 1.
About these five TN type liquid crystal cells, use liquid crystal cell photoelectric characteristic measurement mechanism LCD5200( great mound electronics corporation system) decline response time when obtaining 25 DEG C.Specifically, response time (τ when cutting off voltage from the applying voltage status of V50, V10 is measured
off).Mean value and the 2 σ values of the measured value of five TN type liquid crystal cells are shown in following table 3.In addition in order to reference, the measured value of five TN type liquid crystal cells of one embodiment 1 is also shown in table 3 simultaneously.
[table 3]
Known to from table 3, tilt angle be TN type liquid crystal cell and the tilt angle of the embodiment 2 of 3 degree be the embodiment 1 of 21 degree TN type liquid crystal cell compared with, decline response speed significantly realizes high speed.
[embodiment 3]
Except using making chirality pitch left-handed by adding chiral agent and being adjusted to the ZLI-4792US184(Merck Inc. of 5.0 μm) 475mg adds photo-curable monomer UCL-003(DIC Inc.) except the liquid crystal material of 57mg, all the other are prepared into the TN type liquid crystal cell (p/d=1.0) of four embodiments 3 similarly to Example 1.
About these four TN type liquid crystal cells, use liquid crystal cell photoelectric characteristic measurement mechanism LCD5200( great mound electronics corporation system) decline response time when obtaining 25 DEG C.Specifically, response time (τ when cutting off voltage from the applying voltage status of V50 is measured
off).Mean value and the 2 σ values of the measured value of four TN type liquid crystal cells are shown in following table 4.In addition in order to reference, the measured value of five TN type liquid crystal cells of one embodiment 1 is also shown in table 4 simultaneously.
[table 4]
Known to from table 4, the TN type liquid crystal cell of the embodiment 3 of p/d=1.0 is compared with the TN type liquid crystal cell of the embodiment 1 of p/d=1.5, and decline response speed significantly realizes high speed.
[reference example 1,2]
Except not adding photo-curable monomer in liquid crystal material, all the other are prepared into the TN type liquid crystal cell (p/d=1.5) of five reference examples 1 similarly to Example 1.In addition, make the pitch of liquid crystal material length be except 10 μm except not adding photo-curable monomer in liquid crystal material and changing the amount of chiral agent, all the other are prepared into the TN type liquid crystal cell (p/d=2.0) of five reference examples 2 similarly to Example 1.Then, during before be the TN type liquid crystalline transition of 90 degree from twist angle to be twist angle be the STN type liquid crystal of 270 degree, decline response time when obtaining 25 DEG C similarly to Example 1.Mean value and the 2 σ values of the measured value of each five TN type liquid crystal cells are shown in following table 5.
[table 5]
Known to from table 5 reference example 1, even do not add the situation of photo-curable monomer, as long as during before being STN type liquid crystal from TN type liquid crystalline transition, decline response speed also realizes high speed compared with comparative example 1.But, because response speed is slack-off compared with embodiment 1, therefore knownly decline response speed high speed also can be realized by polymer-stabilized.And determine according to reference example 1,2, by making the short pitch of liquid crystal material thus realizing decline response speed high speed.
Symbol description
100, alignment films 101, liquid crystal molecule
110, upper alignment films 111, lower alignment films
112, liquid crystal molecule 120, upper alignment films
121, lower alignment films 122, liquid crystal molecule
Claims (6)
1. a TN type liquid crystal cell, is characterized in that, comprising:
One group substrate, the almost parallel configuration of a described group substrate and be one of at least transparent;
One group of alignment films, described one group of alignment films is arranged at the opposite face of a described group substrate, and orientation process has been carried out on surface, points to equidirectional to make the liquid crystal molecule in liquid crystal material; And
Liquid crystal layer, described liquid crystal layer is configured between described one group of alignment films, and comprises liquid crystal material and chiral agent,
Described liquid crystal material be chirality pitch P by short pitch and the liquid crystal material that has been reduced of the ratio p/d of the thickness d of described chirality pitch P and liquid crystal layer,
The angle α formed in the orientation process direction of described one group of alignment films is 70 degree to 110 degree, and forms even twist structured direction when described orientation process direction is angle α when being formed described in described liquid crystal layer distortion,
Be that the STN type liquid crystal polymer that α+180 spends is stablized and turned to the TN type liquid crystal that twist angle is α degree without twist angle stable under electric field status.
2. TN type liquid crystal cell according to claim 1, is characterized in that,
In same liquid crystal cell, the free energy of twist angle to be the free energy of STN type liquid crystal that α+180 spends than twist angle the be TN type liquid crystal of α degree is low,
Described liquid crystal layer achieves polymer-stabilized at twist angle α degree.
3. TN type liquid crystal cell according to claim 1, is characterized in that,
When set the thickness of described liquid crystal layer as the chirality pitch of d, described liquid crystal material be p time, 0.5≤p/d≤1.6.
4. TN type liquid crystal cell according to claim 1, is characterized in that,
The tilt angle of described alignment films is less than 5 degree.
5. a manufacture method for TN type liquid crystal cell, is characterized in that, comprising:
At least one of them is a operation respective surface of a transparent group substrate being formed alignment films;
Orientation process is carried out with the operation making the liquid crystal molecule in liquid crystal material point to equidirectional to the surface of alignment films described in a group;
The operation of a described group substrate is configured in the mode that alignment films described in a group is relative;
Described in one group between alignment films filling bag containing chiral agent and photo-curable monomer liquid crystal material thus form the operation of liquid crystal layer;
Alive operation is executed between a described group substrate; And
Stop or making after minimizing applying voltage the operation of described photo-curable monomer photocuring,
Described liquid crystal material be chirality pitch P by short pitch and the liquid crystal material that has been reduced of the ratio p/d of the thickness d of described chirality pitch P and liquid crystal layer,
The angle α formed in the orientation process direction of alignment films described in a group is 70 degree to 110 degree, and forms even twist structured direction when described orientation process direction is angle α when being formed described in described liquid crystal layer distortion,
Executing in alive operation, by applying after voltage makes described liquid crystal layer be in vertical orientated state, to stop or reducing applying voltage, thus making described liquid crystal layer temporarily by the TN type liquid crystalline transition of twist angle to be α+180 STN type liquid crystal of spending to twist angle be α degree,
In photocuring operation, by making described photo-curable monomer photocuring, thus described liquid crystal layer is made to realize polymer-stabilized at twist angle α degree.
6. the manufacture method of TN type liquid crystal cell according to claim 5, is characterized in that,
When set the thickness of described liquid crystal layer as the chirality pitch of d, described liquid crystal material be p time, 0.5≤p/d≤1.6.
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| JP2009-294992 | 2009-12-25 | ||
| JP2009294992 | 2009-12-25 | ||
| PCT/JP2010/072916 WO2011078126A1 (en) | 2009-12-25 | 2010-12-20 | Tn liquid crystal element, and method for producing same |
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| CN102667600B true CN102667600B (en) | 2015-04-01 |
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| JP (1) | JP5648925B2 (en) |
| KR (1) | KR101744768B1 (en) |
| CN (1) | CN102667600B (en) |
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| KR102004526B1 (en) * | 2012-01-17 | 2019-10-17 | 스탄레 덴끼 가부시키가이샤 | Liquid crystal device and drive method thereof |
| JP2013195902A (en) * | 2012-03-22 | 2013-09-30 | Stanley Electric Co Ltd | Liquid crystal display element |
| WO2017154680A1 (en) * | 2016-03-10 | 2017-09-14 | シャープ株式会社 | Liquid crystal display device |
| JP2019164309A (en) * | 2018-03-20 | 2019-09-26 | 東芝ライテック株式会社 | Device for producing liquid crystal panel |
| TWI704393B (en) * | 2019-04-29 | 2020-09-11 | 友達光電股份有限公司 | Display apparatus |
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| JP3192780B2 (en) * | 1992-09-22 | 2001-07-30 | 旭硝子株式会社 | Twisted nematic liquid crystal display device |
| JP2000199901A (en) * | 1998-12-29 | 2000-07-18 | Nec Corp | Liquid crystal display device |
| JP2000347175A (en) * | 1999-03-26 | 2000-12-15 | Seiko Epson Corp | Liquid crystal device, its manufacture and electronic equipment using the device |
| JP2004004301A (en) * | 2002-05-31 | 2004-01-08 | Sharp Corp | Liquid crystal display element and projection type picture display device equipped with the same |
| JP2005010202A (en) * | 2003-06-16 | 2005-01-13 | Nec Corp | Liquid crystal panel, liquid crystal display device using liquid crystal panel, and electronic device on which liquid crystal display is mounted |
| JP5190818B2 (en) * | 2006-03-30 | 2013-04-24 | 学校法人東京理科大学 | Liquid crystal device and method for manufacturing liquid crystal device |
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| KR101744768B1 (en) | 2017-06-08 |
| CN102667600A (en) | 2012-09-12 |
| JP5648925B2 (en) | 2015-01-07 |
| WO2011078126A1 (en) | 2011-06-30 |
| TW201131264A (en) | 2011-09-16 |
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