CN102023414B - The manufacture method of liquid crystal indicator, liquid crystal indicator - Google Patents
The manufacture method of liquid crystal indicator, liquid crystal indicator Download PDFInfo
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- CN102023414B CN102023414B CN201010288544.4A CN201010288544A CN102023414B CN 102023414 B CN102023414 B CN 102023414B CN 201010288544 A CN201010288544 A CN 201010288544A CN 102023414 B CN102023414 B CN 102023414B
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1337—Surface-induced orientation of the liquid crystal molecules, e.g. by alignment layers
- G02F1/133711—Surface-induced orientation of the liquid crystal molecules, e.g. by alignment layers by organic films, e.g. polymeric films
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1337—Surface-induced orientation of the liquid crystal molecules, e.g. by alignment layers
- G02F1/133773—Surface-induced orientation of the liquid crystal molecules, e.g. by alignment layers the alignment material or treatment being different for the two opposite substrates
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1337—Surface-induced orientation of the liquid crystal molecules, e.g. by alignment layers
- G02F1/13378—Surface-induced orientation of the liquid crystal molecules, e.g. by alignment layers by treatment of the surface, e.g. embossing, rubbing or light irradiation
- G02F1/133788—Surface-induced orientation of the liquid crystal molecules, e.g. by alignment layers by treatment of the surface, e.g. embossing, rubbing or light irradiation by light irradiation, e.g. linearly polarised light photo-polymerisation
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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
- G02F1/1393—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 birefringence of the liquid crystal being electrically controlled, e.g. ECB-, DAP-, HAN-, PI-LC cells
- G02F1/1395—Optically compensated birefringence [OCB]- cells or PI- cells
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/137—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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- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
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- Spectroscopy & Molecular Physics (AREA)
- Mathematical Physics (AREA)
- Liquid Crystal (AREA)
Abstract
The invention provides the new technology that can set the tilt angle of liquid crystal molecule in the broader context.Liquid crystal indicator comprises: by the 1st substrate (10) arranged opposite for one side each other and the 2nd substrate; Be located at the 1st orientation limiting layer (15) of the one side side of the 1st substrate; Be located at the 2nd orientation limiting layer of the described one side side of the 2nd substrate; And being located at described 1st substrate and described 2nd substrate liquid crystal layer each other (18), at least one party of the 1st orientation limiting layer (15) or the 2nd orientation limiting layer has: alignment films (12); Be located at the liquid-crystalline polymer film (14) contacted in alignment films and with liquid crystal layer.
Description
Technical field
The present invention relates to the tropism control technology of the liquid crystal molecule in liquid crystal indicator.
Background technology
Tropism control technology is had as one of key technologies manufacturing liquid crystal indicator.In the past, about the technology realizing higher tilt angle (PretiltAngle), such as, be known to the disclosed technology of Japanese Unexamined Patent Publication 6-95115 publication (patent documentation 1).But, when using technology disclosed in patent documentation 1, although the tilt angle of 0 ° ~ 90 ° of expection can be obtained, but also have leeway to be modified in the following areas, that is, owing to using anisotropy dry type etching etc., manufacturing process is complicated, processing charges is high, simultaneously due to the many materials of needs (particulate, resin etc.), so Master Cost is high.In addition, according to the record of patent documentation 1, utilize the shape of protruding body or spicule being formed as sharp shape to be used for carrying out tropism control, and protruding bodies etc. are trickleer parts, think the very difficult shape controlling these parts accurately.Therefore, think according to the shape effect of protruding body etc., be difficult to control tilt angle in wider scope.
[look-ahead technique document]
[patent documentation]
[patent documentation 1] Japanese Unexamined Patent Publication 6-95115 publication
Summary of the invention
One of object of concrete mode of the present invention is, provides the new technology that can set the tilt angle of liquid crystal molecule in the broader context.
The liquid crystal indicator of a mode of the present invention comprises: (a) is by the 1st substrate arranged opposite for one side each other and the 2nd substrate; B () is located at the 1st orientation limiting layer of the described one side side of described 1st substrate; C () is located at the 2nd orientation limiting layer of the described one side side of described 2nd substrate; (d) and be located at described 1st substrate and described 2nd substrate liquid crystal layer each other.Two Fang Jun of described 1st orientation limiting layer and described 2nd orientation limiting layer have: (e) is by the horizontal alignment film carrying out orientation process; F () is located at the liquid-crystalline polymer film contacted on described horizontal alignment film and with described liquid crystal layer.Described liquid crystal layer be inherent liquid crystal molecule direction of orientation with the near interface of the described liquid-crystalline polymer film state of orientation along the direction of the orientation process for described horizontal alignment film, and be formed as the state of orientation of about distortion 90 degree between described 1st substrate and described 2nd substrate on the whole.Described liquid-crystalline polymer film be the more close and described horizontal alignment film of the direction of orientation of inherent liquid crystal molecule interface more relative to this interface close to level, the interface of more close and described liquid crystal layer is more relative to the subvertical state in this interface, and described liquid-crystalline polymer film carries out optical compensation to the part being positioned at opposition side do not contacted with this liquid-crystalline polymer film in described liquid crystal layer.
In above-mentioned liquid crystal indicator, the liquid-crystalline polymer layer of the effect that is subject to downside alignment films and even orientation can be utilized, give higher tilt angle to the liquid crystal molecule contacting the liquid crystal layer arranged with this liquid-crystalline polymer layer.Alignment films and liquid-crystalline polymer layer can both easily utilize fairly simple device and manufacture technics, and pass through to change material now and formation condition, can control tilt angle in the broader context, and this has obtained present inventor and has confirmed.
The mutually different mode in direction that preferably the described horizontal alignment film of described 1st orientation limiting layer and the described horizontal alignment film of described 2nd orientation limiting layer are such that described orientation process carries out described orientation process, and the described liquid-crystalline polymer film of described 1st orientation limiting layer and the described liquid-crystalline polymer film of described 2nd orientation limiting layer are subject to the effect of described horizontal alignment film and even orientation respectively.
Preferred described liquid-crystalline polymer film penetrates by illumination the film making light-cured type liquid crystal liquid crystal property monomer membrane fussion materialization.
The manufacture method of the liquid crystal indicator of a mode of the present invention comprises: (a) the 1st step, forms the 1st orientation limiting layer in the one side of the 1st substrate; B () the 2nd step, is configured to make one side each other opposed by described 1st substrate and the 2nd substrate; C () the 3rd step, forms liquid crystal layer between described 1st substrate and described 2nd substrate.Described 1st step comprises: (d) forms the step of horizontal alignment film in the one side of described 1st substrate; Described horizontal alignment film is carried out to the step of orientation process; E () forms the step of light-cured type liquid crystal liquid crystal property monomer film in described alignment films; F () penetrates by carrying out illumination to described light-cured type liquid crystal liquid crystal property monomer film the step forming liquid-crystalline polymer film.
According to this manufacture method, the tilt angle of the liquid crystal molecule in liquid crystal layer can be set in the broader context, and manufacture liquid crystal indicator.
Accompanying drawing explanation
Fig. 1 is the principle of the orientation limiting layer schematically represented in the liquid crystal display cells of an embodiment and the figure (sectional view) of manufacture method.
Fig. 2 is the sectional view of the topology example schematically representing the liquid crystal indicator with the orientation limiting layer that embodiment relates to.
Fig. 3 is the figure describing the optical compensation function utilizing the liquid-crystalline polymer forming orientation limiting layer to realize in detail.
Fig. 4 is the figure of the relation of standing time after representing coated with liquid crystal monomer film and tilt angle.
Fig. 5 is the figure of the relation representing light exposure and tilt angle.
Label declaration
10,10a, 10b substrate; 12,12a, 12b alignment films; 13 light-cured type liquid-crystalline polymer films; 14 liquid-crystalline polymer films; 16 liquid crystal molecules; 17 interfaces; 18 liquid crystal layers.
Embodiment
Below, with reference to accompanying drawing, embodiments of the present invention are described.
Fig. 1 schematically represents the principle of the orientation limiting layer be suitable in the liquid crystal display cells of an embodiment of the invention and the figure (sectional view) of manufacture method.In addition, for convenience of explanation, drawing of the shade of expression section is omitted.The orientation limiting layer of present embodiment refers to the functional layer that can apply restraint to the liquid crystal molecular orientation be in contact with it in the liquid crystal layer of setting, and basic comprising comprises alignment films and is formed at the liquid-crystalline polymer film in this alignment films.Below, be described in more details.
First, the one side of the substrates such as glass substrate 10 is formed with the alignment films 12 (Fig. 1 (A)) be made up of organic high molecular layers such as polyimide.Such as, utilize the methods such as spin coating to apply aqueous aligning film material in the one side of substrate 10, then implement suitable thermal treatment, obtain alignment films 12 thus.In the present embodiment, alignment films 12 adopts and liquid crystal molecular orientation is restricted to horizontal alignment, and has the film (horizontal alignment film) of ability of the tilt angle (such as several years) providing lower.In addition, friction (ヘ ラ PVC Application グ) process is implemented towards arrow indicated direction in figure.In addition, other surface treatments (such as light orientation process) that can replace friction treatment can also be implemented.In addition, alignment films 12 also can adopt the inoranic membranes such as the silicon oxide film utilizing so-called inclination vapour deposition method to be formed.Further, the electrode (omitting diagram) adopting nesa coating etc. can also be set in the one side of substrate 10.
Then, alignment films 12 is formed light-cured type liquid crystal liquid crystal property monomer film 13 (Fig. 1 (B)).Light-cured type liquid crystal liquid crystal property monomer film 13 such as utilizes the methods such as spin coating to be formed.Now, as shown in Fig. 1 (B), the liquid crystal molecule 16 in light-cured type liquid crystal liquid crystal property monomer film 13 close to and alignment films 12 between interface region in be subject to the orientation restraint of alignment films 12, carry out basic uniform horizontal alignment thus.On the other hand, as shown in Fig. 1 (C), the liquid crystal molecule 16 in light-cured type liquid crystal liquid crystal property monomer film 13 have more more erect close to light-cured type liquid crystal liquid crystal property monomer film 13 and 17, the interface of gas phase, trend that the angle that namely formed with the one side of substrate 10 increases.In order to make this trend more obvious, as the material of light-cured type liquid crystal liquid crystal property monomer film 13, can select at the material easily vertical orientated with liquid crystal molecule in the interface of gas phase.
Then, the illumination that light-cured type liquid crystal liquid crystal property monomer film 13 carries out under predetermined condition (exposure, irradiation time, irradiation number of times etc.) is penetrated, makes light-cured type liquid crystal liquid crystal property monomer film 13 polymerization.Such as, when light-cured type liquid crystal liquid crystal property monomer film 13 is ultraviolet hardenings, carry out Ultraviolet radiation according to the illuminate condition of suitably setting.Thus, alignment films 12 is formed liquid-crystalline polymer film 14 (Fig. 1 (D)).As shown in the figure, along with the more close state of orientation more erected with 17, the interface liquid crystal molecule 16 of gas phase is fixed.Comprise this liquid-crystalline polymer layer 14 and described alignment films 12 formation orientation limiting layer 15.
The liquid-crystalline polymer film 14 of such formation, because liquid crystal molecule 16 is erect with higher angle near interface 17, so play the effect of the liquid crystal molecule 19 contacted with this interface 17 in the liquid crystal layer 18 that arranges being given to higher tilt angle.Although specifically given the tilt angle of which kind of degree, formation condition (material, light illuminate condition etc.) according to liquid-crystalline polymer film 14 cannot treat different things as the same, but as being shown specifically in the embodiment that describes later, at least 10 degree higher tilt angle of about ~ 60 degree can be obtained.
Below, the topology example of the liquid crystal indicator (liquid crystal display cells) of the orientation limiting layer with present embodiment is described.Fig. 2 is the sectional view of the topology example schematically representing liquid crystal indicator (liquid crystal display cells).In fig. 2, as representative examples, respectively illustrate TN (TN:TwistedNematic, twisted nematic) topology example of liquid crystal indicator (Fig. 2 (D)) of the liquid crystal indicator (Fig. 2 (A)) of pattern, the liquid crystal indicator (Fig. 2 (B)) of TN (STN:SuperTwistedNematic, super-twist nematic) pattern, the liquid crystal indicator (Fig. 2 (C)) of optical compensation curved (OCB:OpticallyCompensatedBend) pattern and homogeneous (Homogeneous) pattern.The liquid crystal indicator of each topology example shown in Fig. 2 manufactures like this, prepare two substrates 10a, the 10b with the orientation limiting layer manufactured according to above-mentioned principle, by arranged opposite for the one side of each substrate 10a, 10b, form liquid crystal layer 18 between.In addition, be omitted here diagram, be suitably configured with polarization element (polarization plate) in the outside of each substrate 10a, 10b.
The liquid crystal indicator of the TN pattern shown in Fig. 2 (A) comprises: the substrate 10a with alignment films 12a and liquid-crystalline polymer film 14a; There is the substrate 10b of alignment films 12b and liquid-crystalline polymer film 14b; And be formed at each substrate 10a, 10b liquid crystal layer 18 each other.For the alignment films 12a of substrate 10a, implement friction treatment towards the left direction in figure.Further, for the alignment films 12b of substrate 10b, friction treatment is implemented along the direction roughly orthogonal with the direction of the friction treatment for alignment films 12a.Liquid crystal molecule in liquid crystal layer 18 is at the near interface with each liquid-crystalline polymer film 14a, 14b, become the state of orientation in the direction along the above-mentioned friction treatment for alignment films 12a, 12b respectively, be formed as the state of orientation of about distortion 90 degree between substrate 10a and substrate 10b on the whole.
The basic structure of the liquid crystal indicator of the STN pattern shown in Fig. 2 (B) is identical with the liquid crystal indicator of TN pattern, so omit the detailed description to same section.In this liquid crystal indicator, liquid crystal molecule in liquid crystal layer 18 is at the near interface with each liquid-crystalline polymer film 14a, 14b, become the state of orientation in the direction along the friction treatment for alignment films 12a, 12b respectively, be formed as on the whole between substrate 10a and substrate 10b with the state of orientation of angle (such as 180 degree ~ about 240 degree) distortion being greater than 90 degree.
The basic structure of the liquid crystal indicator of the ocb mode shown in Fig. 2 (C) is identical with the liquid crystal indicator of TN pattern, so omit the detailed description to same section.In this liquid crystal indicator, each substrate 10a, 10b are configured to make the direction for the friction treatment of each alignment films 12a, 12b be identical direction (juxtaposition).Liquid crystal molecule in liquid crystal layer 18 is at the near interface with each liquid-crystalline polymer film 14a, 14b, become the state of orientation in the direction along the friction treatment for alignment films 12a, 12b respectively, and be formed as close to central authorities' then subvertical state of orientation, be formed as on the whole between substrate 10a and substrate 10b, bend to arciform state of orientation (curved orientation state).In addition, in ocb mode, some initial orientations become injection orientation, in this case, apply voltage to liquid crystal layer 18, make to be transitioned into curved orientation shown in Fig. 2 (C).
The basic structure of the liquid crystal indicator of the homogeneous pattern shown in Fig. 2 (D) is identical with the liquid crystal indicator of TN pattern, so omit the detailed description to same section.In this liquid crystal indicator, each substrate 10a, 10b are configured to make the direction for the friction treatment of each alignment films 12a, 12b be reverse direction (antiparallel state).Liquid crystal molecule in liquid crystal layer 18 is at the near interface with each liquid-crystalline polymer film 14a, 14b, become the state of orientation in the direction along the friction treatment for alignment films 12a, 12b respectively, be formed as the state forming certain even angle orientation with the one side of each substrate 10a and substrate 10b on the whole.
Below, according to Fig. 3, for the liquid crystal indicator of above-mentioned TN pattern, describe the optical compensation function utilizing the liquid-crystalline polymer film forming orientation limiting layer to realize in detail.Fig. 3 schematically represents liquid crystal layer 18 in the liquid crystal indicator of TN pattern and the figure across liquid crystal layer 18 each liquid-crystalline polymer film 14a, 14b arranged opposite.Schematically illustrate the state of orientation of the liquid crystal molecule of the inside of each liquid-crystalline polymer layer 14a, 14b and liquid crystal layer 18 in figure 3.Specifically, Fig. 3 (A) represents the schematic cross section of liquid crystal layer 18 grade observed from certain direction, and Fig. 3 (B) represents the schematic cross section from liquid crystal layer 18 grade observed with the direction that situation Fig. 3 (A) Suo Shi differs 90 degree.
As indicated in the various figures, the liquid-crystalline polymer layer 14b of the liquid-crystalline polymer layer 14a being configured at the upside of liquid crystal layer 18 and the downside that is configured at liquid crystal layer 18, the state of orientation of the liquid crystal molecule of its inherence is all spray orientation.This liquid-crystalline polymer layer 14a, 14b especially play a role as effective optical compensation films (so-called O sheet) in the liquid crystal layer 18 of TN pattern as shown in the figure.But, liquid-crystalline polymer layer 14a, 14b of present embodiment from be considered to bring the structure of the O sheet of the most effective optical compensation effect different.That is, the optic axis of liquid-crystalline polymer layer 14a is substantially parallel with the direction of orientation of liquid crystal molecule of liquid crystal layer 18 of the near interface being positioned at liquid-crystalline polymer layer 14a and liquid crystal layer 18.Further, the state of orientation of inherent in liquid-crystalline polymer layer 14a liquid crystal molecule is that the side of subvertical state contacts with liquid crystal layer 18.The part of liquid-crystalline polymer layer 14a to the opposition side (side close to liquid-crystalline polymer layer 14b) being positioned at this liquid-crystalline polymer layer 14a in liquid crystal layer 18 entirety of this structure brings optical compensation effect.Liquid-crystalline polymer layer 14b is also identical.That is, the part of liquid-crystalline polymer layer 14b to the opposition side (side close to liquid-crystalline polymer layer 14a) being positioned at this liquid-crystalline polymer layer 14b in liquid crystal layer 18 entirety brings optical compensation effect.Therefore, compared with being considered to the O sheet of the best, the optical compensation effect of liquid-crystalline polymer layer 14a, 14b of present embodiment may not increase in the past.But have the liquid crystal indicator of liquid-crystalline polymer layer 14a, 14b of present embodiment compared with not having the liquid crystal indicator of optical compensation films, at least visual characteristic is good.
According to above-described present embodiment, tilt angle can be set in the broader context to obtain liquid crystal indicator.By adopting the orientation limiting layer of present embodiment, except each topology example shown in Fig. 2, also easily can realize brand-new display mode etc., needing the liquid crystal indicator of the display mode of higher tilt angle.
Further, according to the present embodiment, the key element as orientation limiting layer can also be utilized and the liquid-crystalline polymer layer be located on substrate and obtain optical compensation function.Thus, compared with the sheet arranged in addition for obtaining optical compensation function, there is the advantage of the structure that can simplify liquid crystal indicator.
Below, several embodiments of present embodiment are described.
(embodiment 1)
Preparation is formed with a pair glass substrate of the transparency electrode be made up of ITO (tin indium oxide) film.The thickness of ito film is
(dust), the thickness of glass substrate is 0.7mm, and glass material is alkali-free glass.Clean these glass substrates, then by common lithography step, ito film is carried out showing methods and become reservation shape.Here, the engraving method of ito film adopts Wet-type etching (iron chloride).
Then, alignment films is formed on the glass substrate.Here, alignment films adopts common horizontal alignment film.Aligning film material coating on the glass substrate adopts spin-coating method to carry out.Specifically, implement the spin coating of 5 seconds with 2000rpm, then implement the spin coating of 10 seconds with 4000rpm.In addition, also the method such as flexible printing and ink jet printing can be adopted.Then, for coated alignment films on the glass substrate, utilize cleaning oven to carry out the thermal treatment of 250 DEG C, 1 hour.
Then, friction treatment has been carried out for alignment films.The cylindric roller High Rotation Speed being wound with cloth is instigated in said friction, utilizes this roller to carry out the process of wiping alignment films.By carrying out this friction, alignment films has the effect liquid crystal molecule be in contact with it being arranged (orientation) along a direction.Here, by time arranged opposite for two substrates, carry out processing to become the mutually different state in the direction rubbed (antiparallel state).
Then, alignment films applies ultraviolet hardening liquid crystal liquid crystal property monomer material, define liquid crystal liquid crystal property monomer film (light-cured type liquid crystal liquid crystal property monomer film).Here, spin coating (2000rpm, 25 seconds) is implemented.After this liquid crystal liquid crystal property monomer film is placed certain hour, to film whole irradiation ultraviolet radiation, thus liquid crystal liquid crystal property monomer film is converted to liquid-crystalline polymer film.Ultraviolet irradiation carries out under air atmosphere.
Then, two glass substrates are overlapped at preposition, and uses epoxy resin to fix, realize blocking thus.In the present embodiment, be configured with two glass substrates, to obtain the liquid crystal indicator of the above-mentioned homogeneous pattern shown in Fig. 2 (D).Mylar is drawn to be inserted between two glass substrates as partition member 25 μm of thick nurses.Then, adopt the injection method that make use of capillarity, in the gap of two glass substrates, inject liquid crystal material.Thus, between two glass substrates, liquid crystal layer is defined.Liquid crystal material adopts common nematic liquid crystalline material and 5CB.
In the present embodiment, the standing time be coated with after liquid crystal liquid crystal property monomer film, light exposure respectively as parameter, investigate the relation of these parameters and the tilt angle that utilizes liquid-crystalline polymer layer to give.Describe these results below in detail.
Fig. 4 is the figure of the relation representing the standing time after being coated with liquid crystal liquid crystal property monomer film and tilt angle.In addition, is suitably set as 1 minute ~ 30 minutes standing time, ultraviolet irradiation amount is fixed as 5000mJ/cm
2condition.Learn as shown in Figure 4, be no matter which standing time, the higher tilt angle of 7 ° ~ about 10 ° can be obtained.Further, the large dependence of obtained tilt angle to standing time is not found.Like this, comparatively large relative to the surplus of standing time, this is very favorable factor in the mill.
Fig. 5 is the figure of the relation representing light exposure and tilt angle.In addition, ultraviolet irradiation amount is suitably set as 1000mJ/cm
2~ 5000mJ/cm
2between, 1 minute will be fixed as standing time.As shown in Figure 5, find that tilt angle and light exposure have very large dependence, and found the light exposure trend that tilt angle is higher more at least.Learn according to Fig. 5, by the end of general 3500mJ/cm
2scope in, tilt angle from 50 ° ~ about 60 ° continuously (substantially linearly) change to about 10 °.Learn thus and can control tilt angle in the broader context according to light exposure.By adjusting the setting of light irradiation device, can easily change light exposure, thus can be described as parameter manageable in the mill.
In addition, in Fig. 4, Fig. 5, deviation bar represents deviation when evaluating multiple sample (each Unit 4).This deviation has the lower then less trend of tilt angle.The similar trend of the deviation of the tilt angle in this trend and common alignment films.But when 50 ° ~ 60 ° of this very high tilt angles, deviation is about ± and 5 °, learn and can realize better tropism control.Further, the state of orientation of the liquid crystal indicator of the present embodiment is stablized, in electro-optical characteristic, do not find magnetic hysteresis etc., and does not find that when visualization display is uneven.
(embodiment 2)
Preparation is formed with a pair glass substrate of the transparency electrode be made up of ITO (tin indium oxide) film.The thickness of ito film is
(dust), the thickness of glass substrate is 0.7mm, and glass material is alkali-free glass.Clean these glass substrates, then by common lithography step, ito film is carried out showing methods and become reservation shape.Here, the engraving method of ito film adopts Wet-type etching (iron chloride).
Then, alignment films is formed on the glass substrate.Here, alignment films adopts the horizontal alignment film with the effect of the lower tilt angle of imparting.Aligning film material coating is on the glass substrate undertaken by flexible printing.Then, for coated alignment films on the glass substrate, utilize cleaning oven to carry out the thermal treatment of 220 DEG C, 1 hour.
Then, friction treatment has been carried out for alignment films.Here, by time arranged opposite for two substrates, carry out processing to become the mutually different state in the direction making to rub (antiparallel state).
Then, alignment films applies ultraviolet hardening liquid crystal liquid crystal property monomer material by spin coating, define liquid crystal liquid crystal property monomer film (light-cured type liquid crystal liquid crystal property monomer film).Here, the material different from above-described embodiment 1 is adopted.The condition of spin coating can between 1000rpm ~ 3000rpm setting speed changeably, will be set as 30 seconds the time.After this liquid crystal liquid crystal property monomer film is placed certain hour (being all 1 minute in the present embodiment), to film whole irradiation ultraviolet radiation, thus liquid crystal liquid crystal property monomer film is converted to liquid-crystalline polymer film.Light exposure is 8400mJ/cm
2(illumination of irradiating 2 minutes is 70W/cm
2ultraviolet).Further, the ultraviolet irradiation in the present embodiment carries out under any one atmosphere in air atmosphere or in nitrogen atmosphere.In ultraviolet hardening liquid crystal liquid crystal property monomer material, also there is in atmosphere the material that (state containing oxygen) is not easy to carry out polymerization.In this material, even if sometimes irradiate enough ultraviolets in atmosphere, the film of Air Interface also can not solidify completely, and presents the surface state with cementability of sticky paste.The material adopted in the present embodiment is the material also carrying out in atmosphere reacting, but needs atmosphere when noting Ultraviolet radiation according to material.
Then, two glass substrates are overlapped at preposition, realizes blocking thus.In the present embodiment, be configured with two glass substrates, to obtain the liquid crystal indicator of the above-mentioned homogeneous pattern shown in Fig. 2 (D).Specifically, utilize dry type scattering method, the one side of a glass substrate in two glass substrates scatters clearance control agent.Clearance control agent adopts the plastic bead (small pearl) of particle diameter 6 μm, but also can adopt true stone ball.Further, the one side of another glass substrate defines primary seal pattern (and conductive member pattern).Here be have employed silk screen print method, but also can adopt divider (displacer) etc.Sealant have employed heat cured sealant, but also can be the sealant of light solidity, photo-thermal with the sealant of type.The particle diameter being mixed into a few % in sealing agent is the glass fibre of 6 μm.Further, the conductive member comprising gold bead etc. is printed on preposition.Here, using the material that obtains after being mixed into the glass fibre and the gold bead of particle diameter than about large 1 μm of the particle diameter of this glass fibre that describe before a few % in the encapsulant as conductive member, serigraphy is carried out.Then, two glass substrates are overlapped and makes blocking, and make sealant cures by thermal treatment under state in punching press.Here, hot stamped process is utilized to carry out heat curing (150 DEG C of sintering).
Then, vacuum impregnation is utilized to inject liquid crystal material in the gap of two glass substrates.Thus, between two glass substrates, liquid crystal layer is defined.Liquid crystal material adopts common nematic liquid crystalline material.After injection liquid crystal material, final sealant is utilized to be sealed by inlet.Further, in order to make state of orientation neat, unit is heated to more than the phase inversion temperature of liquid crystal material.Here, baking oven is utilized to carry out the thermal treatment of 120 DEG C, 30 minutes.Further, in the outside of each glass substrate, pasted by the polarization plate cutting into predetermined size in advance with predetermined angle.
For the liquid crystal display cells made like this, the mensuration of electro-optical characteristic and tilt angle, microscopic examination are carried out.Determine tilt angle in the scope of 20mm × 25mm every 9 points.Its result is as follows.
Sample 1
Rotating speed during spin coating: 1000rpm (thickness
)
When illumination is penetrated: nitrogen atmosphere
→ tilt angle 37.7 ° (35.5 ° ~ 40.7 °)
Sample 2
Rotating speed during spin coating: 1000rpm (thickness
)
When illumination is penetrated: air atmosphere
→ tilt angle 40.4 ° (37.5 ° ~ 43.4 °)
Sample 3
Rotating speed during spin coating: 2000rpm (thickness
)
When illumination is penetrated: air atmosphere
→ tilt angle 31.7 ° (29.4 ° ~ 34.2 °)
Sample 4
Rotating speed during spin coating: 3000rpm (thickness
)
When illumination is penetrated: nitrogen atmosphere
→ tilt angle 22.8 ° (22.0 ° ~ 23.7 °)
Sample 5
Rotating speed during spin coating: 3000rpm (thickness
)
When illumination is penetrated: air atmosphere
→ tilt angle 26.8 ° (24.9 ° ~ 28.5 °)
According to above result, by the liquid-crystalline polymer layer adopting the ultraviolet hardening liquid crystal liquid crystal property monomer material different from embodiment 1 to be formed, also tilt angle can be controlled energetically.That is, confirming liquid-crystalline polymer layer is not the phenomenon being confined to specific ultraviolet hardening liquid crystal liquid crystal property monomer material to the control performance of tilt angle.Further, the state of orientation of the liquid crystal indicator of the present embodiment is stablized, and does not find that electro-optical characteristic has magnetic hysteresis etc., and does not find that when visualization display is uneven.About atmosphere gas during Ultraviolet radiation, do not have to find larger difference in air atmosphere and in nitrogen atmosphere.But, about the deviation of tilt angle, found the trend that deviation in nitrogen atmosphere is smaller.That is, in nitrogen atmosphere, carry out Ultraviolet radiation, likely can suppress the deviation of tilt angle.
(distortion etc. of embodiment)
In addition, the invention is not restricted to above-mentioned embodiment and the content of each embodiment, can various distortion be carried out without departing from the spirit and scope of the present invention and implement.Such as, the numerical value of the manufacturing condition suitably illustrated in the above description etc. is an example, but is not limited to these numerical value.And, in above-mentioned liquid crystal indicator, the orientation limiting layer with alignment films and liquid-crystalline polymer film is provided with respectively for the 1st substrate, the 2nd substrate, but only have substrate to need, in the liquid crystal indicator of the display mode of higher tilt angle etc., also only to arrange above-mentioned orientation limiting layer for a substrate adopting.Further, in the above description, be illustrated horizontal alignment film as one of the alignment films forming orientation limiting layer, but alignment films also can adopt vertical alignment layer.
Claims (3)
1. a liquid crystal indicator, comprising:
By the 1st substrate arranged opposite for one side each other and the 2nd substrate;
Be located at the 1st orientation limiting layer of the described one side side of described 1st substrate;
Be located at the 2nd orientation limiting layer of the described one side side of described 2nd substrate; And
Be located at described 1st substrate and described 2nd substrate liquid crystal layer each other,
Two Fang Jun of described 1st orientation limiting layer and described 2nd orientation limiting layer have:
By the horizontal alignment film carrying out orientation process; And
Be located at the liquid-crystalline polymer film contacted on described horizontal alignment film and with described liquid crystal layer,
It is characterized in that,
Described liquid crystal layer be inherent liquid crystal molecule direction of orientation with the near interface of the described liquid-crystalline polymer film state of orientation along the direction of the orientation process for described horizontal alignment film, and be formed as the state of orientation of about distortion 90 degree between described 1st substrate and described 2nd substrate on the whole
Described liquid-crystalline polymer film be the more close and described horizontal alignment film of the direction of orientation of inherent liquid crystal molecule interface more relative to this interface close to level, the interface of more close and described liquid crystal layer is more relative to the subvertical state in this interface, and described liquid-crystalline polymer film carries out optical compensation to the part being positioned at opposition side do not contacted with this liquid-crystalline polymer film in described liquid crystal layer.
2. liquid crystal indicator according to claim 1,
The mutually different mode in direction that the described horizontal alignment film of described 1st orientation limiting layer and the described horizontal alignment film of described 2nd orientation limiting layer are such that described orientation process carries out described orientation process,
The described liquid-crystalline polymer film of described 1st orientation limiting layer and the described liquid-crystalline polymer film of described 2nd orientation limiting layer are subject to the effect of described horizontal alignment film and even orientation respectively.
3. liquid crystal indicator according to claim 1 and 2, described liquid-crystalline polymer film penetrates the film after making light-cured type liquid crystal liquid crystal property monomer membrane fussion materialization by illumination.
Applications Claiming Priority (2)
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|---|---|---|---|
| JP2009216853A JP5583940B2 (en) | 2009-09-18 | 2009-09-18 | Liquid crystal display device and method of manufacturing liquid crystal display device |
| JP2009-216853 | 2009-09-18 |
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| JP (1) | JP5583940B2 (en) |
| KR (1) | KR101698142B1 (en) |
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| CN1573458A (en) * | 2001-10-02 | 2005-02-02 | 富士通显示技术株式会社 | Substrate for liquid crystal display, and liquid crystal display using the same |
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| JPS63129323A (en) * | 1986-11-20 | 1988-06-01 | Asahi Glass Co Ltd | Liquid crystal display element |
| JPH10507007A (en) * | 1994-09-30 | 1998-07-07 | ロックウェル・インターナショナル・コーポレイション | Organic polymer O-plate compensator for improved grayscale performance of twisted nematic liquid crystal displays |
| JP3403093B2 (en) * | 1998-10-21 | 2003-05-06 | 三菱重工業株式会社 | Method and equipment for producing reduced iron |
| JP2000122066A (en) * | 1998-10-21 | 2000-04-28 | Hitachi Ltd | Liquid crystal display device |
| JP2003172935A (en) * | 2001-12-07 | 2003-06-20 | Seiko Epson Corp | Liquid crystal device, manufacturing method for liquid crystal device and electronic instrument |
| JP2004219948A (en) * | 2003-01-17 | 2004-08-05 | Nippon Hoso Kyokai <Nhk> | Liquid crystal optical element and its manufacture method |
| JP4911281B2 (en) * | 2006-01-31 | 2012-04-04 | 大日本印刷株式会社 | Method for forming hybrid oriented retardation control layer |
| JP2009086296A (en) * | 2007-09-28 | 2009-04-23 | Sharp Corp | Manufacturing method of liquid crystal display panel |
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| TW201115208A (en) | 2011-05-01 |
| JP2011065019A (en) | 2011-03-31 |
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| JP5583940B2 (en) | 2014-09-03 |
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