CN102667600A - 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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- CN102667600A CN102667600A CN2010800583467A CN201080058346A CN102667600A CN 102667600 A CN102667600 A CN 102667600A CN 2010800583467 A CN2010800583467 A CN 2010800583467A CN 201080058346 A CN201080058346 A CN 201080058346A CN 102667600 A CN102667600 A CN 102667600A
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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
- G02F1/137—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
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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
- G02F1/137—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
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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
- G02F1/137—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
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 manufacturing approach thereof.
Background technology
In recent years, to the large product that is used for LCD TV, the market of liquid crystal cell enlarges gradually from the small sized product that is used for portable phone.
This liquid crystal cell with the so-called TN of the structure of orientation process direction distortion 90 degree with upper and lower base plate (Twisted Nematic: twisted-nematic) the type liquid crystal cell be the center development so far; But the field at special demands visual angles such as large-scale tvs, the multizone homeotropic alignment), (In Plane Switching: mode becomes main flow to IPS gradually the coplane switch) etc. MVA (Multi domain Vertical Aligned:.But the TN mode is compared advantages such as the variation (gap (gap) deviation) that has with respect to the variation transmitance of liquid crystal cell (cell) thickness is few with other modes, can be used in personal computer etc. not have special strict demand to the visual angle purposes.
And in recent years; TN type liquid crystal cell through with the combination of the blooming that is called as view film (wideview film) that can enlarge TN type liquid crystal visual angle; TV purposes below also can be used in about 26 inches gradually, and TN type liquid crystal has accounted for 80% in the LCD TV of size below 26 inches.
Usually, to being used for the liquid crystal cell special demands high-speed response property of TV purposes.TN type response speed of liquid crystal is by following formula (1), (2) expression.
[mathematical expression 1]
At this, τ
OnExpression is risen (never applying voltage status to the response that the applies voltage status) response time, τ
OffExpression descends (from applying voltage status to the response that the does not apply voltage status) response time.
In addition, γ
1The rotary viscosity of expression liquid crystal material, ε
0The expression permittivity of vacuum, Δ ε representes dielectric anisotropy, and d representes thickness of liquid crystal layer, and V representes to apply voltage, V
ThThe expression threshold voltage, K representes the elastic modulus of liquid crystal material.In the TN type liquid crystal, K=K
11-0.5K
22+ 0.25K
33, K
11, K
22, K
33Represent respectively about opening up the elastic modulus of song (spray) deformation, distortion (twist) deformation, bending (bend) deformation.
Such as from following formula (1) knowledge because the rising response speed depends on and applies voltage, therefore can realize high speed through applying the voltage application method.Otherwise,, therefore can not realize high speed based on signal voltage because the decline response speed does not rely on and applies voltage.For this reason, with respect to the rising response speed, require the high speed of decline response speed more in the liquid crystal cell.
In order to realize the response speed high speed that descends, can consider to reduce γ by following formula (2)
1(rotary viscosity), the improvement that increases K material aspects such as (elastic modulus), and the improvement that reduces d equipment aspects such as (thickness of liquid crystal layer).Wherein about the thickness of liquid crystal layer, the situation of known TN type liquid crystal must satisfy Δ nd >=0.50 (μ m) (Δ n is the refraction guiding property of liquid crystal material).If do not satisfy this condition then the transmitance minimizing of liquid crystal cell.Because Δ n=0.25 is regarded as the limit in the available liquid crystal material, can think that therefore d=2 (μ m) is the limit.About liquid crystal material, there is the limit in the improvement of its rotary viscosity, elastic modulus.For this reason, from the relation of following formula (2), the decline response speed of TN type liquid crystal is difficult to have bigger improvement.
As the method that does not show in following formula (1), (2); Known for example have through in liquid crystal material, adding be called as the optically active substance of chirality (chiral) agent, thereby reduce the ratio (p/d) of the chirality pitch P of liquid crystal material and thickness of liquid crystal layer d, the method for raising decline response speed.About this method, following report is arranged up to now.
Patent documentation 1,2 disclose through thickness of liquid crystal layer is set at 0.5 μ m～3 μ m, the p/d value is set at less than 15, thereby realize the technology of liquid crystal cell high speed.
Patent documentation 3 discloses the technology that in the scope of 0.25＜d/p＜1 (i.e. 1＜p/d＜4), realizes TN type liquid crystal high speed.Record the analogue value of decline response speed in this patent documentation 3 from d/p=0.04 (p/d=25) to d/p=1 (p/d=1).In addition, record the data of d/p=0.51 (p/d=2.0) as actual experiment.
Put down in writing the situation that when shortening the chirality pitch of liquid crystal material, realizes decline response speed high speed in the patent documentation 4.Put down in writing tilt angle in addition, thereby even used short pitch liquid crystal material also can realize making the situation of 90 degree twisted state stabilizations through the increase alignment films.Particularly, through tilt angle being set at 13.6 degree,, also can make it keep the twisted state of 90 degree even in liquid crystal cell, form the liquid crystal material of 210 degree twisted states originally.210 degree twisted states are equivalent to p/d=1.7.
Put down in writing in the non-patent literature 1 in the liquid crystal layer of 12 μ m thickness, foreshortened to 25 μ m (p/d=2.1) through chirality pitch from 70 μ m (p/d=5), thereby the decline response speed is improved as the situation of 200ms by 400ms liquid crystal material.
The prior art document
Patent documentation
Patent documentation 1: the spy opens the 2007-193362 communique
Patent documentation 2: the spy opens the 2008-176343 communique
Patent documentation 3: the spy opens the 2003-161962 communique
Patent documentation 4: the spy opens the 2000-199901 communique
Non-patent literature
Non-patent literature 1:S.Aftergut and H.S.Cole Jr., J.Appl.Phys.Lett., 30 (8), P.363, (1977)
Non-patent literature 2: ship field, refreshing rugged city village stone well pine Pu, Sharp's skill newspaper, 39 (35), (1988)
Summary of the invention
The technical matters that invention will solve
As stated, can realize through reducing the p/d value the descending high speed of response speed.But known have when the liquid crystal layer twist angle is α (degree), if lack pitchization then twist angle changes the situation of α+180 (degree) (with reference to non-patent literature 2) into.For this reason, twist angle is under the situation of TN type liquid crystal of 90 degree, if lack pitchization then form the STN that twist angle is 270 degree (Super Twited Nematic: supertwist is to row) type liquid crystal.In addition, p/d=2 is a lower limit in the non-patent literature 2.
Above-mentioned patent documentation 3 records the analog result of the liquid crystal cell of 1＜p/d＜4 scopes, but this only is the result of analog computation rather than the result of actual measurement.As actual measured value, minimum value is p/d=2.0.
At this,,, thereby even use short pitch liquid crystal material also can realize the stabilization of 90 degree twisted states through the tilt angle of increase alignment films like 4 records of above-mentioned patent documentation.But even increase tilt angle, also there is the limit in the p/d value that can realize, even in patent documentation 4, also only disclose p/d=1.7.In addition, the TN type liquid crystal of this state is envisioned as unstable liquid crystal, also can change to STN type liquid crystal owing to temperature variation, stress application, vibration etc. even if be considered to form.
In view of above-mentioned technical matters, the object of the invention is for providing a kind of TN type liquid crystal cell and manufacturing approach thereof, and its TN type mesomorphic state is stable, and has realized the high speed of decline response speed.
The means of technical solution problem
For solving the problems of the technologies described above, the application inventor furthers investigate.Its result finds; Even reducing the p/d value is that the TN type liquid crystal phase of α (degree) is the more stable situation of STN type liquid crystal of α+180 (degree) than twist angle with twist angle then; Form at STN type liquid crystal under the condition of the bent structure of exhibition; Be eliminated if apply voltage then open up bent structure, thereby temporarily remain on the state that twist angle is α (degree).And find through in liquid crystal material, adding the photo-curable monomer, and make the curing of photo-curable monomer under the state that twist angle is α (degree), can realize liquid crystal layer polymer-stabilized at twist angle α (degree) temporary transient formation.Accomplish the present invention based on above-mentioned opinion, description of contents is following more specifically.
(1) a kind of TN type liquid crystal display cells is characterized in that, comprising: a group substrate, and a said group substrate almost parallel disposes and one of them is transparent at least; One group of alignment films, said one group of alignment films is arranged at the opposite face of a said group substrate, and the surface carried out orientation process, so that the liquid crystal molecule in the liquid crystal material points to equidirectional; And liquid crystal layer; Said liquid crystal layer is disposed between said one group of alignment films; And comprise liquid crystal material and chirality agent; The formed angle α of the orientation process direction of said one group of alignment films be 70 degree to 110 degree, and said orientation process direction is when said liquid crystal layer twists said formed angle α, to form even twist structured direction, stable twist angle is that STN type liquid crystal polymer that α+180 are spent is stablized and turned to the TN type liquid crystal that twist angle is the α degree under the no electric field status.
(2) according to above-mentioned (1) described TN type liquid crystal display cells; It is characterized in that; Twist angle is that the free energy of the STN type liquid crystal of α+180 degree is that the free energy of TN type liquid crystal of α degree is low than twist angle in same liquid crystal display cells, and said liquid crystal layer has been realized polymer-stabilized at twist angle α degree.
(3) according to above-mentioned (1) or (2) described TN type liquid crystal display cells, it is characterized in that, when the thickness of establishing said liquid crystal layer is the chirality pitch of d, said liquid crystal material when being p, 0.5≤p/d≤1.6.
According to each described TN type liquid crystal display cells in above-mentioned (1) to (3), it is characterized in that (4) tilt angle of said alignment films is below 5 degree.
(5) a kind of manufacturing approach of TN type liquid crystal display cells is characterized in that, comprising: the operation that on a surface separately of one of them transparent group substrate at least, forms alignment films; Orientation process is carried out so that the liquid crystal molecule in the liquid crystal material points to the operation of equidirectional in the surface of said one group of alignment films; Dispose the operation of a said group substrate with said one group of relative mode of alignment films; Thereby between said one group of alignment films, fill the operation that the liquid crystal material that comprises chirality agent and photo-curable monomer forms liquid crystal layer; Between a said group substrate, apply the operation of voltage; And stop or reducing applying the operation that makes said photo-curable monomer photocuring behind the voltage; The formed angle α of the orientation process direction of said one group of alignment films is that 70 degree are to 110 degree; And said orientation process direction is when said liquid crystal layer twists said formed angle α, to form even twist structured direction; In the said operation that applies voltage,, stop or reducing applying voltage through after applying voltage and making said liquid crystal layer be in vertical orientated state; Thereby making said liquid crystal layer is that the STN type liquid crystal that α+180 are spent is the TN type liquid crystal transformation of α degree to twist angle by twist angle temporarily; In the said photocuring operation, through making said photo-curable monomer photocuring, thereby make said liquid crystal layer realize polymer-stabilized at twist angle α degree.
(6) according to the manufacturing approach of above-mentioned (5) described TN type liquid crystal display cells, it is characterized in that, when the thickness of establishing said liquid crystal layer is the chirality pitch of d, said liquid crystal material when being p, 0.5≤p/d≤1.6.
The invention effect
According to the present invention, can provide a kind of TN type mesomorphic state stable and TN type liquid crystal display cells and manufacturing approach thereof that realize decline response speed high speed.
Description of drawings
Fig. 1 be illustrate TN type liquid crystal cell involved in the present invention manufacturing approach one the example figure.
Fig. 2 is the figure that erects direction of schematically illustrated orientation process direction and liquid crystal molecule.
Fig. 3 is the figure of the appearance of schematically illustrated liquid crystal molecule left side aligned twisted.
Fig. 4 is the figure of the appearance of the right aligned twisted of schematically illustrated liquid crystal molecule.
Fig. 5 is the response time τ that descends when the chirality pitch that changes liquid crystal material is shown
OffThe figure of analog result.
Fig. 6 is the figure of the orientation process direction of alignment films about illustrating among the embodiment 1.
Fig. 7 is the figure that illustrates liquid crystal cell observed liquid crystal layer change when applying voltage of preparation among the embodiment 1.
Fig. 8 is five the TN type liquid crystal cells (element 1～5) that illustrate about preparation among the embodiment 1, and response time τ descends when applying the state incision outage pressure of V10 voltage for 25 ℃
OffMeasurement result case line chart.
Fig. 9 is five the TN type liquid crystal cells (element 1～5) that illustrate about preparation among the embodiment 1, it is in apply the V50 voltage status in the moment of 20ms, makes the figure that its time that is in transmitance when not applying voltage status changes in the moment of 520ms.
Figure 10 amplifies to illustrate among Fig. 9 from the moment of 510ms to begin the figure till the moment of 570ms.
Figure 11 is five the TN type liquid crystal cells (element 1～5) that illustrate about preparation among the embodiment 1, and response time τ descends when applying the state incision outage pressure of V10 voltage for-20 ℃
OffMeasurement result case line chart.
Embodiment
Below, be elaborated with reference to the accompanying drawing specific embodiments of the invention.
Below at first the liquid crystal material that constitutes liquid crystal layer is described, then the manufacturing approach to TN type liquid crystal cell involved in the present invention describes, and at last TN type liquid crystal cell involved in the present invention is described.
[liquid crystal material]
The liquid crystal material that constitutes liquid crystal layer among the present invention comprises chirality agent and photo-curable monomer.
Use nematic crystal as liquid crystal material.Though its kind does not limit especially, consider the formula (2) of foregoing relevant decline response speed, the then preferred liquid crystal material that rotary viscosity is lower, elastic modulus is bigger.
Do not limit especially as the chirality agent, can use existing known chirality agent.Can enumerate out S-811, R811, CB-15, MLC6247, MLC6248, R1011, S1011 (which kind of all is the Merck manufactured) etc. as an example.Through adjusting the content of above-mentioned chirality agent, can adjust the chirality pitch of liquid crystal material.
Do not limit as the photo-curable monomer is special.Can enumerate out as an example: Jia Jibingxisuanyizhi, butyl methacrylate, methacrylic acid-2-Octyl Nitrite, EHMA, lauryl methacrylate, methacrylic acid stearyl, the different myristyl ester of methacrylic acid (isomyristyl methacrylate), methacrylic acid isooctadecane base ester (isostearyl methacrylate), methacrylic acid methoxy base ethyl ester, methacrylic acid ethoxy ethyl ester, 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 DPG methacrylate (methoxy dipropylene glycol methacrylate), trifluoroethyl methacrylate, dimethylamino methyl acrylic ester (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 1; 6-hexanediol dimethacrylate, dicyclopentenyl dimethylacrylate (dicyclo pentenyl dimethacrylate), bisphenol a dimethacrylate, epoxychloropropane modified bisphenol a dimethacrylate, oxirane modified bisphenol A dimethylacrylate, 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 hexamethyl acrylic ester, pentaerythritol acrylate trimethyl, pentaerythrite tetramethyl acrylic ester, dipentaerythritol tetramethyl acrylic ester, dipentaerythritol hexamethyl acrylic ester, methacrylic acid carbamate, N; N-DMAA, N, N-dimethylaminopropyl acrylic amide etc.
In addition, the material that preferably presents liquid crystal liquid crystal property as the photo-curable monomer.For example being documented in the spy about the photo-curable monomer that presents liquid crystal liquid crystal property opens flat 8-3111 communique, spy and opens 2000-178233 communique, spy and open 2000-119222 communique, spy and open 2000-327632 communique, spy and open that 2002-220421 communique, spy are opened the 2003-55661 communique, the spy opens 2003-12762 communique etc.
The content of photo-curable monomer is 0.1 quality % to 15 quality % with respect to liquid crystal material preferably along with the tilt angle of the kind of photo-curable monomer and alignment films is different and different, more preferably 0.5 quality % to 10 quality %.Through content being set at more than the 0.1 quality % the polymer-stabilized effect of stating after can fully obtaining.In addition, through content being set at below the 15 quality %, the driving voltage that can suppress liquid crystal cell increases and contrast decline.
[manufacturing approach of TN type liquid crystal cell]
Liquid crystal cell manufacturing approach involved in the present invention is characterized in that, comprising: the operation that on a surface separately of one of them transparent group substrate at least, forms alignment films; Orientation process is carried out so that the liquid crystal molecule in the liquid crystal material points to the operation of equidirectional in the surface of said one group of alignment films; Dispose the operation of a said group substrate with said one group of relative mode of alignment films; Thereby between said one group of alignment films, fill the operation that the liquid crystal material that comprises chirality agent and photo-curable monomer forms liquid crystal layer; Between a said group substrate, apply the operation of voltage; And stop or reducing applying the operation that makes said photo-curable monomer photocuring behind the voltage; Wherein, The formed angle α of the orientation process direction of said one group of alignment films be 70 degree to 110 degree, and said orientation process direction is when said liquid crystal layer twists said formed angle α, to form even twist structured direction, in the said operation that applies voltage; Through after applying voltage and making said liquid crystal layer be in vertical orientated state; Stopping or reducing applying voltage, is that the STN type liquid crystal that α+180 are spent is the TN type liquid crystal transformation of α degree to twist angle by twist angle temporarily thereby make said liquid crystal layer, in the said photocuring operation; Through making said photo-curable monomer photocuring, thereby make said liquid crystal layer realize polymer-stabilized at twist angle α degree.
Below, suitably one example of the manufacturing approach of TN type liquid crystal cell involved in the present invention is elaborated with reference to Fig. 1.Fig. 1 resolves into the figure shown in each step with the manufacturing process of TN type liquid crystal cell.
At first, clean also dry the surface of one of them transparent group substrate (step S10, S11) at least.Then, through coating polyimide on a surface separately of an above-mentioned group substrate, and dry, burn till and form alignment films (polyimide film) (step S12, S13).Then, to each alignment layer surface rub (rubbing) handle (orientation process) so that the liquid crystal molecule in the liquid crystal material points to equidirectional (step S14).
Fig. 2 schematically shows the direction that erects of orientation process direction and liquid crystal molecule.After the surface of alignment films 100 carried out orientation process, the liquid crystal molecule 101 of alignment layer surface in the direction of orientation process shown in the arrow and the face perpendicular to the direction of alignment films 100, tilted to erect certain angle θ with respect to this orientation process direction in comprising figure.This angle θ is called as tilt angle.
The tilt angle of alignment films is preferably below 5 degree among the present invention.Below tilt angle being set at 5 degree, can realize the response speed high speed that descends.
Then, scatter sept (spacer) (step S16) with the cleaning of the substrate after the friction treatment, dry back (step S15).Apply sealing (seal) agent and make its drying (step S17) at the substrate periphery then.At this moment, when sealing, reserve inlet and the exhausr port that is formed for injecting liquid crystal material.
Then with above-mentioned group substrate assembling back (step S18), the heated sealant agent is solidified it, and the peripheral part of encapsulated liquid crystals element (step S19).During assembling so that one group of relative mode of above-mentioned alignment films disposes an above-mentioned group substrate.Wherein, the formed angle α of the orientation process direction of two alignment films is that 70 degree are to 110 degree.If light leak less than 70 degree or greater than 110 degree, takes place during then black the demonstration and reduces contrast in formed angle α.In addition, during black the demonstration, along with the different light leaks of direction of observation! Guang order け) increase.In addition, can further improve contrast/view angle dependency through formed angle α being set at 80 degree to 100 degree.
And the orientation process direction of two alignment films is when liquid crystal layer twists above-mentioned formed angle α, to form even twist structured direction.
At this, consider between the formed angle α of orientation process direction is one group of alignment films of 90 degree, to be filled with the situation of liquid crystal material.Liquid crystal molecule 112 tilts to erect pretilt theta from last alignment films 110 and following alignment films 111 among Fig. 3.Keeping under the state of this pretilt theta between the alignment films up and down then, liquid crystal molecule is arranged on distortion 90 degree ground from last alignment films 110 downward alignment films 111 right sides (clockwise).
On the other hand, liquid crystal molecule 122 tilts to erect pretilt theta from last alignment films 120 and following alignment films 121 among Fig. 4.Then up and down between the alignment films polar angle (angle that forms between liquid crystal molecule and the alignment films) of liquid crystal molecule begin continuous variation by tilt angle, and be θ in last alignment films, become 0 degree (parallel) at central portion with substrate, be θ descending alignment films.With the substrate vertical direction on be accompanied by this distortion, arrange from last alignment films 110 downward alignment films 111 left sides (counterclockwise) distortions 90 degree ground simultaneously.Structure as shown in Figure 4 is called as the bent structure of exhibition.
The bent structure of exhibition shown in Figure 4 is owing to liquid crystal molecule also distortion on above-below direction, so free energy is high.Thereby do not contain the chirality agent and do not have in the situation of intrinsic distortion spontaneously right distortion 90 degree of liquid crystal material at liquid crystal material.In addition, add in the situation of the chirality agent of bringing out right distortion as shown in Figure 3 also right distortion 90 degree to liquid crystal material.
That is, if orientation process direction as shown in Figure 3, then in above-mentioned liquid crystal material twists the situation of above-mentioned formed angle α, do not form the bent structure of exhibition and form uniform distorted-structure.Relative therewith, when in alignment films up and down, using liquid crystal material same as described above under the orientation process of one of them situation in the opposite direction, then form the bent structure of exhibition.In addition, if orientation process direction as shown in Figure 3 then when in liquid crystal material, adding the chirality agent of bringing out left side distortion, also forms the bent structure of exhibition.
In addition, in the orientation process direction as shown in Figure 3,, then form the bent structure of exhibition if make the twist angle of liquid crystal material become 270 degree through for example adding the chirality agent of bringing out right distortion.
Then, injection comprises the liquid crystal material of above-mentioned chirality agent and photo-curable monomer and forms liquid crystal layer (step S20) between one group of above-mentioned alignment films, afterwards with inlet and exhausr port sealing (step S21).As stated, can adjust the chirality pitch of liquid crystal material through the content of adjustment chirality agent.In order to realize the response speed high speed that descends, preferably the chirality pitch P of liquid crystal material and the ratio (p/d) of thickness of liquid crystal layer d are set at 0.5≤p/d≤1.6 among the present invention, more preferably are set at 1.0≤p/d≤1.6.
At this, twist angle is that the STN type liquid crystal of α+180 (degree) is stable under no electric field status among the present invention.That is, in the same liquid crystal display cells, twist angle is that the free energy of the STN type liquid crystal of α+180 (degree) is in than twist angle is the low state of free energy of the TN type liquid crystal of α (degree).
" same liquid crystal display cells " is meant all components identical of all key elements that the performance to liquid crystal cells such as liquid crystal material and chirality pitch, thickness of liquid crystal layer or aligning film material, frictional direction, frictional strengths exerts an influence.
And; " twist angle is that the free energy of the STN type liquid crystal of α+180 (degree) is that the free energy of TN type liquid crystal of α (degree) is low than twist angle " is though be meant and not only have that to form twist angle be the TN type liquid crystal of α (degree) but also to have the formation twist angle be the situation of the STN type liquid crystal of α+180 (degree) that twist angle is that the free energy of the STN type liquid crystal of α+180 (degree) is compared lower.Wherein, Because proper free energy is difficult to calculate; Therefore " free energy of STN type liquid crystal is compared lower " is meant: particularly through at room temperature placing the situation that experience a period of time (several seconds was to several hours) back changes to STN type liquid crystal from TN type liquid crystal.
As stated, when the p/d value being set at 0.5≤p/d≤1.6 scopes, change (if desired then with reference to non-patent literature 2) from TN type liquid crystal to STN type liquid crystal after experience a period of time.This be since the free energy of STN type liquid crystal than the low cause of free energy of TN type liquid crystal.That is, 0.5≤p/d≤1.6 scopes are the states of " twist angle is that the free energy of the STN type liquid crystal of α+180 (degree) is that the free energy of TN type liquid crystal of α (degree) is low than twist angle in the same liquid crystal display cells ".
Then to applying voltage (step S22) between the substrate.Particularly, apply voltage liquid crystal layer is become after the vertical orientated state, apply voltage to make liquid crystal layer be that the STN type liquid crystal of α+180 (degree) is that the TN type liquid crystal of α (degree) changes to twist angle from twist angle temporarily through stopping or reducing.In addition, the minimizing degree when reducing voltage is the twisted state variation of α (degree) as long as hang down to enough making liquid crystal layer to twist angle by vertical orientated state.
As stated; Among the present invention since in the same liquid crystal display cells twist angle be that the free energy of the STN type liquid crystal of α+180 (degree) is in than twist angle be the low state of free energy of the TN type liquid crystal of α (degree), so change to STN type liquid crystal from TN type liquid crystal after experiencing a period of time.But,, can temporarily make it to change to TN type liquid crystal from STN type liquid crystal through applying than the sufficiently high voltage of saturation voltage.Can think that this is owing to liquid crystal layer in STN type mesomorphic state forms the bent structure of exhibition, thereby but make the bent structure elimination of exhibition form uniform distorted-structure through applying than the sufficiently high voltage of saturation voltage.
The voltage that applies is preferably 1.5～5 times of saturation voltage along with the kind of liquid crystal material etc. and different.And application time is preferably tens of seconds to several minutes.
Then, carry out photocuring, and realize polymer-stabilized (the step S23) of liquid crystal layer at twist angle α (degree) through the photo-curable monomer irradiation ultraviolet radiation in liquid crystal material.Since this polymer-stabilized, even as stated the p/d value is set at the situation of 0.5≤p/d≤1.6 scopes, also can suppress to change to STN type liquid crystal from TN type liquid crystal.
In addition, to keep twist angle be that time of twisted state of α (degree) is different along with the tilt angle of the kind of liquid crystal material and alignment films to liquid crystal layer.Because twist angle is that the TN type liquid crystal of α (degree) becomes more stable when tilt angle increases, so to keep twist angle be the time lengthening of the twisted state of α (degree).
[TN type liquid crystal cell]
TN type liquid crystal cell involved in the present invention is characterised in that, comprising: a group substrate, and a said group substrate almost parallel disposes and one of them is transparent at least; One group of alignment films, said one group of alignment films is arranged at the opposite face of a said group substrate, and the surface carried out orientation process, so that the liquid crystal molecule in the liquid crystal material points to equidirectional; And liquid crystal layer; Said liquid crystal layer is disposed between said one group of alignment films; And comprise liquid crystal material and chirality agent; Wherein, the formed angle α of the orientation process direction of said one group of alignment films be 70 degree to 110 degree, and said orientation process direction is when said liquid crystal layer twists said formed angle α, to form even twist structured direction; Stable twist angle is that the STN type liquid crystal of α+180 degree has realized polymer-stabilized under the no electric field status, and becoming twist angle is the TN type liquid crystal of α degree.
Because this TN type liquid crystal cell is the product that forms through the manufacturing of above-mentioned TN type liquid crystal cell manufacturing approach, therefore omit its detailed explanation.
Owing to can the p/d value of this TN type liquid crystal cell be set at 0.5≤p/d≤1.6 scopes, therefore compare and to realize the response speed high speed that descends with common TN type liquid crystal cell.
At this, use the analog result of Liquid Crystal Molecules Alignment simulator LCD Master (Shintec corporate system) to be shown in Fig. 5.Fig. 5 illustrates the parameter of using liquid crystal material ZL1-4792 (Merck corporate system), and the alignment films tilt angle is set at that distance (being thickness of liquid crystal layer) between 20 degree, alignment films is set at 5 μ m, the decline response time τ when making the chirality pitch variation of liquid crystal material
OffThe figure of variation.Above-mentioned τ
OffBe that the voltage status that applies when reaching 50% transmittance of transmitance when not applying voltage is cut off voltage and is 0V, the transmittance when not applying voltage is set at 100, and 50% transmitance is set at 0 o'clock, and transmitance was changed to for 90 needed times from 10.Such as from Fig. 5 knowledge, the more little response time τ that then descends of the chirality pitch of liquid crystal material
OffShort more.Be appreciated that thus through the p/d value being set at the once unapproachable 0.5≤p/d of prior art≤1.6 scopes, thereby 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 does not receive the restriction of these embodiment.
[embodiment 1, comparative example 1]
The electrode part that on the glass substrate of 2cm * 2cm * 1.1cm size, forms the transparency electrode of 1cm * 1cm and be used for electrode is directed to the outside.On ready glass substrate like this, apply liquid crystal orientation film about 1 μ m thickness, Chisso petrochemistry corporate system with polyimide PIA-x768-01x and PIA-x359-01x potpourri with the mixed of 45:55, thus the formation alignment films.Use kapok throwing flannelette that this alignment films is carried out friction treatment.Friction treatment direction (orientation process direction) is according to direction shown in Figure 6.In addition, the tilt angle of alignment films is 21 degree.
Then; Scatter silicon dioxide system sept (5 microns of HIPRESICA (the Ha イ プ シ カ) UF of diameter 5 μ m therein on alignment films; Space portion day east changes into corporate system) back applies the epoxies sealant at periphery, and heating made it to solidify in 1 hour under 150 ℃.Produce two holes during sealing as the inlet and the exhausr port that are used to inject liquid crystal material.
Then, in by epoxies sealant sealed space, inject liquid crystal material.The liquid crystal material modulated process is following: to through after adding the chirality agent and making chirality pitch ZLI-4792US123 (Merck corporate system) 475mg left-handed and that be adjusted into 7.5 μ m add photo-curable monomer UCL-003 (DIC corporate system) 27mg, went up heating 3 minutes and process at 100 ℃ electric hot plates (hot plate).The pitch that this liquid crystal material has 7.5 left-handed μ m is long.Be p/d=1.5.This liquid crystal material is contacted with inlet, utilize capillarity that liquid crystal material is injected in the whole liquid crystal cell.
Inject after the liquid crystal material, slowly cool off and with polarized light microscope observing liquid crystal aligning state, the orientation of observing liquid crystal is all identical.Two Polarizers are assembled into the so-called cross-polarized light plate (crossed Nichol) of absorption axes quadrature; Be configured in liquid crystal cell between two Polarizers and when observing, observe integral colouring and be blueness with the axle mode parallel that see through of Polarizer with frictional direction.Liquid crystal layer twists 90 when spending between substrate, in this observation, should not take place painted and form white states.Therefore can think that this state is liquid crystal layer twists 270 degree between substrate a state.
Then, the square wave that the electrode of liquid crystal cell is applied 20V makes liquid crystal layer form vertical orientated state and kept this state 5 minutes.When with the variation of polarized light microscope observing during this, observe liquid crystal arrangement and different with it point-like liquid crystal arrangement (Fig. 7 (b)) gently occurs from uniform state (Fig. 7 (a)).This then liquid crystal arrangement enlarges ((c) of Fig. 7, (d)) gradually, forms the liquid crystal arrangement (Fig. 7 (e)) of all identical new generation at last.Can think that this variation is in twist angle is the STN type mesomorphic state of 270 degree, the result of TN type mesomorphic state that twist angle is 90 degree to occur.
In order to confirm this imagination; Two Polarizers are assembled into cross-polarized light; Be configured in liquid crystal cell between two Polarizers and when observing with the axle mode parallel that see through of Polarizer with frictional direction; Discovery applies before the voltage integral colouring for blue, therewith relatively owing to apply do not observe in the liquid crystal arrangement that voltage produces painted.Confirm thus to apply that liquid crystal arrangement is the STN type liquid crystal of 270 degree corresponding to twist angle before the voltage, and because to apply liquid crystal arrangement that voltage produces be the 90 TN type liquid crystal of spending corresponding to twist angle.
Stop to apply the ultraviolet ray of shining 5 minutes 365nm wavelength at once via Longlife (registered trademark) optical filter (SPECTROLINE corporate system) after the voltage, make photo-curable monomer photocuring.After the ultraviolet ray irradiation former state state held 30 days, still keeping twist angle is the TN type mesomorphic state of 90 degree.In addition, though not shown concrete data, even but stop to apply after the voltage not irradiation ultraviolet radiation, be the 90 TN type mesomorphic states of spending if then still kept twist angle in several minutes to several hours.
Become the TN type liquid crystal cell of five embodiment 1 according to method for preparing.
And except in liquid crystal material, not adding chirality agent and the photo-curable monomer, all the other and embodiment 1 likewise are prepared into the TN type liquid crystal cell of five comparative examples 1.
About each five TN type liquid crystal cell of the embodiment 1 that is prepared into, comparative example 1, use liquid crystal cell photoelectric characteristic measurement mechanism LCD5200 1-amino-2-naphthol-4-sulfonic acid Da mound electronics corporation system) decline response time when obtaining 25 ℃.Particularly; Transmittance when not applying voltage status is 100%, be 0% o'clock with the transmittance of cross-polarized light plate; Apply voltage V50, V10 for what obtain 50%, 10% transmittance, the response time (τ when measuring from the applying voltage status and cut off voltage of V50, V10
Off).This τ
OffBe when the transmittance when not applying voltage status is 100%, when transmittance when respectively applying voltage is 0%, transmittance changed to for 90% needed time from 10%.The mean value and the 2 σ values of the measured value of each five TN type liquid crystal cell are shown in following table 1.Measured value when in addition, applying voltage V10 is shown in the case line chart of Fig. 8.
[table 1]
Such as from table 1 and Fig. 8 knowledge; Thereby add the chirality agent and make p/d=1.5 twist angle be 90 degree TN type mesomorphic state down the TN type liquid crystal cell of the polymer-stabilized embodiment 1 of realization compare with the TN type liquid crystal cell of the comparative example 1 that does not add chirality agent and photo-curable monomer, the decline response speed significantly realizes high speed.
About five TN type liquid crystal cells (element 1～5) of preparation among the embodiment 1, with moment of 20ms be V50 apply voltage status, with moment of 520ms when not applying voltage status, the time variation of the transmitance in the time of 25 ℃ is shown in Fig. 9.In addition, the sloping portion of Fig. 9 (beginning till the moment of 570ms from moment of 510ms) amplifies and is shown in Figure 10.
As from Fig. 9,10 knowledges, the response characteristic that rises, descends has repeatability.And can know that for situation at a high speed TN type mesomorphic state is fixed according to response speed.
In addition, about each five TN type liquid crystal cell of the embodiment 1 that is prepared into, comparative example 1, use liquid crystal cell photoelectric characteristic measurement mechanism LCD5200 1-amino-2-naphthol-4-sulfonic acid Da mound electronics corporation system) decline response time when obtaining-20 ℃.Response time (τ when particularly, measuring from the applying voltage status and cut off voltage of V10
Off).The mean value and the 2 σ values of the measured value of each five TN type liquid crystal cell are shown in following table 2.Measured value when in addition, applying voltage V10 is shown in the case line chart of Figure 11.
[table 2]
Such as from table 2 and Figure 11 knowledge; Even under-20 ℃ low temperature; Thereby add the chirality agent and make p/d=1.5 twist angle be 90 degree TN type mesomorphic state down the TN type liquid crystal cell of the polymer-stabilized embodiment 1 of realization compare with the TN type liquid crystal cell of the comparative example 1 that does not add chirality agent and photo-curable monomer, the decline response speed also significantly realizes high speed.
[embodiment 2]
The addition that is set at 3 degree, photo-curable monomer UCLA-003 (DIC corporate system) except the tilt angle of alignment films is set at the 52.8mg, and all the other and embodiment 1 likewise are prepared into the TN type liquid crystal cell of five embodiment 2.
About these five TN type liquid crystal cells, use liquid crystal cell photoelectric characteristic measurement mechanism LCD5200 1-amino-2-naphthol-4-sulfonic acid Da mound electronics corporation system) decline response time when obtaining 25 ℃.Response time (τ when particularly, measuring from the applying voltage status and cut off voltage of V50, V10
Off).The mean value of the measured value of five TN type liquid crystal cells and 2 σ values are shown in following table 3.For reference, the measured value of five TN type liquid crystal cells of relevant embodiment 1 is shown simultaneously also in the table 3 in addition.
[table 3]
Such as from table 3 knowledge, tilt angle is that TN type liquid crystal cell and the tilt angle of the embodiment 2 of 3 degree is that the TN type liquid crystal cell of the embodiment 1 of 21 degree is compared, the decline response speed significantly realizes high speed.
[embodiment 3]
Except using through adding the chirality agent chirality pitch ZLI-4792US184 (Merck corporate system) 475mg left-handed and that be adjusted into 5.0 μ m being added the liquid crystal material of photo-curable monomer UCL-003 (DIC corporate system) 57mg, all the other and embodiment 1 likewise are prepared into the TN type liquid crystal cell (p/d=1.0) of four embodiment 3.
About these four TN type liquid crystal cells, use liquid crystal cell photoelectric characteristic measurement mechanism LCD5200 1-amino-2-naphthol-4-sulfonic acid Da mound electronics corporation system) decline response time when obtaining 25 ℃.Response time (τ when particularly, measuring from the applying voltage status and cut off voltage of V50
Off).The mean value of the measured value of four TN type liquid crystal cells and 2 σ values are shown in following table 4.For reference, the measured value of five TN type liquid crystal cells of relevant embodiment 1 is shown simultaneously also in the table 4 in addition.
[table 4]
Such as from table 4 knowledge, 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, the decline response speed significantly realizes high speed.
[reference example 1,2]
In liquid crystal material, do not add the photo-curable monomer, all the other and embodiment 1 likewise are prepared into the TN type liquid crystal cell (p/d=1.5) of five reference examples 1.In addition, it is the 10 μ m that the amount of in liquid crystal material, not adding the photo-curable monomer and changing the chirality agent makes the pitch length of liquid crystal material, and all the other and embodiment 1 likewise are prepared into the TN type liquid crystal cell (p/d=2.0) of five reference examples 2.Then, from twist angle be 90 the degree TN type liquid crystal change into twist angle be 270 the degree STN type liquid crystal before during, the decline response time when likewise obtaining 25 ℃ with embodiment 1.The mean value and the 2 σ values of the measured value of each five TN type liquid crystal cell are shown in following table 5.
[table 5]
As from 1 knowledge of table 5 reference example, even do not add the situation of photo-curable monomer, so long as from TN type liquid crystal change into before the STN type liquid crystal during, compare the decline response speed with comparative example 1 and also realize high speed.But,, therefore can know and also can realize the response speed high speed that descends through polymer-stabilized because to compare response speed slack-off with embodiment 1.And confirm, thereby through making the short pitchization of liquid crystal material realize decline response speed high speed according to reference example 1,2.
Symbol description
100, alignment films 101, liquid crystal molecule
110, go up alignment films 111, following alignment films
112, liquid crystal molecule 120, last alignment films
121, following alignment films 122, liquid crystal molecule
Claims (6)
1. a TN type liquid crystal display cells is characterized in that, comprising:
One group substrate, said group substrate almost parallel configuration and be transparent one of at least;
One group of alignment films, said one group of alignment films is arranged at the opposite face of a said group substrate,
And orientation process has been carried out on the surface, so that the liquid crystal molecule in the liquid crystal material points to equidirectional;
And
Liquid crystal layer, said liquid crystal layer are disposed between said one group of alignment films, and comprise liquid crystal material and chirality agent,
The formed angle α of the orientation process direction of said one group of alignment films be 70 degree to 110 degree, and said orientation process direction is when said liquid crystal layer twists said formed angle α, to form even twist structured direction,
To be that the STN type liquid crystal polymer of α+180 degree is stable turn to the TN type liquid crystal that twist angle is the α degree to stable twist angle under the no electric field status.
2. TN type liquid crystal display cells according to claim 1 is characterized in that,
Twist angle is that the free energy of the STN type liquid crystal of α+180 degree is that the free energy of TN type liquid crystal of α degree is low than twist angle in same liquid crystal display cells,
Said liquid crystal layer has been realized polymer-stabilized at twist angle α degree.
3. TN type liquid crystal display cells according to claim 1 and 2 is characterized in that,
When the thickness of establishing said liquid crystal layer is the chirality pitch of d, said liquid crystal material when being p, 0.5≤p/d≤1.6.
4. according to each described TN type liquid crystal display cells in the claim 1 to 3, it is characterized in that,
The tilt angle of said alignment films is below 5 degree.
5. the manufacturing approach of a TN type liquid crystal cell is characterized in that, comprising:
In that one of them is the operation that forms alignment films on the surface separately of a transparent group substrate at least;
Orientation process is carried out so that the liquid crystal molecule in the liquid crystal material points to the operation of equidirectional in the surface of one group of said alignment films;
Dispose the operation of a said group substrate with one group of relative mode of said alignment films;
Thereby between one group of said alignment films, fill the operation that the liquid crystal material that comprises chirality agent and photo-curable monomer forms liquid crystal layer;
Between a said group substrate, apply the operation of voltage; And
Stop or reducing applying the operation that makes said photo-curable monomer photocuring behind the voltage,
The formed angle α of the orientation process direction of one group of said alignment films be 70 degree to 110 degree, and said orientation process direction is when said liquid crystal layer twists said formed angle α, to form even twist structured direction,
Apply in the operation of voltage; Through after applying voltage and making said liquid crystal layer be in vertical orientated state; Stopping or reducing applying voltage, is that the STN type liquid crystal that α+180 are spent is the TN type liquid crystal transformation of α degree to twist angle by twist angle temporarily thereby make said liquid crystal layer
In the photocuring operation, through making said photo-curable monomer photocuring, thereby make said liquid crystal layer realize polymer-stabilized at twist angle α degree.
6. the manufacturing approach of TN type liquid crystal cell according to claim 5 is characterized in that,
When the thickness of establishing said liquid crystal layer is the chirality pitch of d, said liquid crystal material when being p, 0.5≤p/d≤1.6.
Applications Claiming Priority (3)
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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 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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| CN110780490A (en) * | 2019-04-29 | 2020-02-11 | 友达光电股份有限公司 | Display device |
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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 |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06160814A (en) * | 1992-09-22 | 1994-06-07 | Asahi Glass Co Ltd | Twisted nematic liquid crystal display element |
| 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 |
| CN1991552A (en) * | 2003-06-16 | 2007-07-04 | 日本电气株式会社 | Liquid crystal panel, liquid crystal display device, and electronic equipment |
Family Cites Families (1)
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| 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 |
-
2010
- 2010-12-20 JP JP2011547542A patent/JP5648925B2/en not_active Expired - Fee Related
- 2010-12-20 KR KR1020127015978A patent/KR101744768B1/en active IP Right Grant
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- 2010-12-20 WO PCT/JP2010/072916 patent/WO2011078126A1/en active Application Filing
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06160814A (en) * | 1992-09-22 | 1994-06-07 | Asahi Glass Co Ltd | Twisted nematic liquid crystal display element |
| 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 |
| CN1991552A (en) * | 2003-06-16 | 2007-07-04 | 日本电气株式会社 | Liquid crystal panel, liquid crystal display device, and electronic equipment |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110780490A (en) * | 2019-04-29 | 2020-02-11 | 友达光电股份有限公司 | Display device |
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| KR20120101461A (en) | 2012-09-13 |
| WO2011078126A1 (en) | 2011-06-30 |
| KR101744768B1 (en) | 2017-06-08 |
| JPWO2011078126A1 (en) | 2013-05-09 |
| CN102667600B (en) | 2015-04-01 |
| TW201131264A (en) | 2011-09-16 |
| JP5648925B2 (en) | 2015-01-07 |
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