CN102023414A - Liquid crystal display and method for manufacturing same - Google Patents
Liquid crystal display and method for manufacturing same Download PDFInfo
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- CN102023414A CN102023414A CN2010102885444A CN201010288544A CN102023414A CN 102023414 A CN102023414 A CN 102023414A CN 2010102885444 A CN2010102885444 A CN 2010102885444A CN 201010288544 A CN201010288544 A CN 201010288544A CN 102023414 A CN102023414 A CN 102023414A
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- 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
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- 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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- Physics & Mathematics (AREA)
- Nonlinear Science (AREA)
- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Mathematical Physics (AREA)
- Liquid Crystal (AREA)
Abstract
The invention discloses a new technology which can set pre-inclination angle for liquid crystal molecule within a wider range, so disposed that the liquid crystal display herein comprises a first substrate (10) and a second substrate which have their one face disposed relative to each other, a first orientation limiting layer (15) disposed on one face side of the first substrate, a second orientation limiting layer (15) disposed on one face side of the second substrate, and a liquid crystal layer (18) between the first substrate and the second substrate, wherein at least one of the first orientation limiting layer (15) or the second orientation limiting layer is provided with an orientation film (12) which is provided with a liquid crystal polymer film (14) thereon, the liquid crystal polymer film (14) being in contact with the liquid crystal layer.
Description
Technical field
The present invention relates to the orientation control technology of the liquid crystal molecule in the liquid crystal indicator.
Background technology
As one of key technologies of making liquid crystal indicator the orientation control technology is arranged.In the past, about realizing the technology of higher tilt angle (Pretilt Angle), for example known had a disclosed technology of Japanese kokai publication hei 6-95115 communique (patent documentation 1).But, under the situation of using patent documentation 1 disclosed technology, though 0 °～90 ° the tilt angle that can obtain to expect, but also exist in the following areas to remain room for improvement, that is, owing to use anisotropy dry type etching etc., the manufacturing process complexity, the processing charges height is simultaneously owing to needing many materials (particulate, resin etc.), so the Master Cost height.In addition,, utilize to form the projection body of sharp shape or the shape of spicule is used for being orientated control, and projection bodies etc. are trickleer parts, think the very difficult shape of controlling these parts accurately according to the record of patent documentation 1.Therefore, think, be difficult in wider scope inner control tilt angle according to the shape effects of projection body etc.
[look-ahead technique document]
[patent documentation]
[patent documentation 1] Japanese kokai publication hei 6-95115 communique
Summary of the invention
One of purpose of concrete mode of the present invention is, the new technology that can set the tilt angle of liquid crystal molecule in the broader context is provided.
The liquid crystal indicator of a mode of the present invention comprises: the 1st substrate and the 2nd substrate of (a) inciting somebody to action one side arranged opposite each other; (b) be located at the 1st orientation limitations layer of the described one side side of described the 1st substrate; (c) be located at the 2nd orientation limitations layer of the described one side side of described the 2nd substrate; (d) and be located at described the 1st substrate and described the 2nd substrate liquid crystal layer each other.At least one side of described the 1st orientation limitations layer or described the 2nd orientation limitations layer has: (e) alignment films; (f) be located on the described alignment films and the liquid-crystalline polymer film that contacts with described liquid crystal layer.
In above-mentioned liquid crystal indicator, can utilize the effect that is subjected to the downside alignment films and the even liquid-crystalline polymer layer of orientation, give higher tilt angle to the liquid crystal molecule of the liquid crystal layer that contact setting with this liquid-crystalline polymer layer.Alignment films and liquid-crystalline polymer layer can both utilize fairly simple device and technology manufacturing easily, and by changing material and the formation condition of this moment, can control tilt angle in the broader context, and this has obtained the present application people and has confirmed.
Preferred described alignment films is a horizontal alignment film.
Preferred described liquid-crystalline polymer film is the film that makes light-cured type liquid crystal liquid crystal property monomer membrane fussion materialization by rayed.
The manufacture method of the liquid crystal indicator of a mode of the present invention comprises: (a) the 1st step forms the 1st orientation limitations layer in the one side of the 1st substrate; (b) the 2nd step is configured to make one side each other opposed described the 1st substrate and the 2nd substrate; (c) the 3rd step forms liquid crystal layer between described the 1st substrate and described the 2nd substrate.Described the 1st step comprises: the step that (d) forms alignment films on the one side of described the 1st substrate; (e) step of formation light-cured type liquid crystal liquid crystal property monomer film on described alignment films; (f) by described light-cured type liquid crystal liquid crystal property monomer film is carried out the step that rayed forms the liquid-crystalline polymer film.
According to this manufacture method, can set the tilt angle of the liquid crystal molecule in the liquid crystal layer in the broader context, and make liquid crystal indicator.
Description of drawings
Fig. 1 schematically represents the principle of the orientation limitations layer in the liquid crystal display cells of an embodiment and the figure (sectional view) of manufacture method.
Fig. 2 is the sectional view of topology example of schematically representing to have the liquid crystal indicator of the orientation limitations layer that embodiment relates to.
Fig. 3 is the figure that describes the optical compensation function that utilizes the liquid-crystalline polymer realization that constitutes the orientation limitations layer in detail.
Fig. 4 is the figure of the relation of standing time behind the expression coated with liquid crystal monomer film and tilt angle.
Fig. 5 is the figure of the relation of expression rayed amount 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 the description of drawings embodiments of the present invention.
Fig. 1 has schematically represented to be suitable for the principle of the orientation limitations layer 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, omit the drawing of shade of expression section.The orientation limitations layer of present embodiment is meant the functional layer that can apply restraint to the liquid crystal molecular orientation in the liquid crystal layer that is in contact with it setting, and basic comprising comprises alignment films and the liquid-crystalline polymer film that is formed on this alignment films.Below, be described in more details.
At first, on the one side of substrates such as glass substrate 10, be formed with the alignment films 12 (Fig. 1 (A)) that constitutes by organic high molecular layers such as polyimide.For example, utilize methods such as spin coating on the one side of substrate 10, to apply aqueous aligning film material, implement suitable thermal treatment then, obtain alignment films 12 thus.In the present embodiment, alignment films 12 adopts liquid crystal molecular orientation is restricted to horizontal alignment, and has the film (horizontal alignment film) of the ability of the tilt angle (for example several years) that provides lower.In addition, the arrow indicated direction is implemented friction (ヘ ラ PVC Application グ) and is handled in the figure.In addition, also can implement to replace other surface treatments (for example light orientation process) of friction treatment.In addition, alignment films 12 also can adopt the inoranic membranes such as silicon oxide film that utilize so-called inclination vapour deposition method to form.And, the electrode (omitting diagram) that adopts nesa coating etc. can also be set on the one side of substrate 10.
Then, on alignment films 12, form 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 for example utilizes method formation such as spin coating.At this moment, shown in Fig. 1 (B), be subjected to the orientation limitations power of alignment films 12 in the zone at the interface of the liquid crystal molecule 16 in the light-cured type liquid crystal liquid crystal property monomer film 13 between approaching and alignment films 12, carry out basic horizontal alignment uniformly thus.On the other hand, shown in Fig. 1 (C), the liquid crystal molecule 16 in the light-cured type liquid crystal liquid crystal property monomer film 13 has more the trend that angle that 17 at interface near light-cured type liquid crystal liquid crystal property monomer film 13 and gas phase erects more, promptly forms with basic 10 one side increases.In order to make this trend more obvious,, can be chosen in the interface with gas phase liquid crystal molecule vertical orientated material easily as the material of light-cured type liquid crystal liquid crystal property monomer film 13.
Then, light-cured type liquid crystal liquid crystal property monomer film 13 is carried out rayed under the predetermined condition (exposure, irradiation time, irradiation number of times etc.), make the 13 polymerization materializations of light-cured type liquid crystal liquid crystal property monomer film.For example, be under the situation of ultraviolet hardening at light-cured type liquid crystal liquid crystal property monomer film 13, carry out the ultraviolet ray irradiation according to the illuminate condition of suitable setting.Thus, on alignment films 12, form liquid-crystalline polymer film 14 (Fig. 1 (D)).As shown in the figure, the state of orientation that erects more along with 17 liquid crystal molecules 16 in interface approaching more and gas phase is fixed.Comprise this liquid-crystalline polymer layer 14 and described alignment films 12 formation orientation limitations layers 15.
The liquid-crystalline polymer film 14 of Xing Chenging like this is because liquid crystal molecule 16 erects with higher angle near interface 17, so performance is to contact the effect that the liquid crystal layer 18 interior liquid crystal molecules 19 that are provided with are given higher tilt angle with this interface 17.Though specifically given the tilt angle of which kind of degree, formation condition (material, rayed condition etc.) according to liquid-crystalline polymer film 14 cannot treat different things as the same, but as being shown specifically among the embodiment of narration in the back, can obtain the higher tilt angle about at least 10 degree～60 degree.
Below, the topology example of the liquid crystal indicator (liquid crystal display cells) of the orientation limitations layer with present embodiment is described.Fig. 2 is a sectional view of schematically representing the topology example of liquid crystal indicator (liquid crystal display cells).In Fig. 2, as typical example, show TN (TN:Twisted Nematic respectively, twisted nematic) topology example of the liquid crystal indicator (Fig. 2 (D)) of liquid crystal indicator (Fig. 2 (C)) of the liquid crystal indicator of pattern (Fig. 2 (A)), the liquid crystal indicator (Fig. 2 (B)) of TN (STN:Super Twisted Nematic, super-twist nematic) pattern, optical compensation curved (OCB:Optically Compensated Bend) pattern and homogeneous (Homogeneous) pattern.The liquid crystal indicator of each topology example shown in Figure 2 is to make like this, preparation has two substrate 10a, 10b of the orientation limitations layer of making according to above-mentioned principle, with the one side arranged opposite of each substrate 10a, 10b, between forms liquid crystal layer 18.In addition, omitted diagram here, suitably disposed 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; Substrate 10b with 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, the left in the figure is to implementing friction treatment.And, for the alignment films 12b of substrate 10b, along with at the direction of the friction treatment of alignment films 12a roughly the direction of quadrature implement friction treatment.Liquid crystal molecule in the liquid crystal layer 18 with the near interface of each liquid- crystalline polymer film 14a, 14b, become respectively along the state of orientation of the direction of above-mentioned friction treatment at alignment films 12a, 12b, form the state of orientation of between substrate 10a and substrate 10b, twisting 90 degree approximately 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 the liquid crystal layer 18 with the near interface of each liquid- crystalline polymer film 14a, 14b, become respectively along state of orientation at the direction of the friction treatment of alignment films 12a, 12b, form on the whole between substrate 10a and the substrate 10b with state of orientation greater than angles (for example about 180 degree～240 degree) distortion of 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, it is identical direction (state side by side) that each substrate 10a, 10b are configured to make the direction at the friction treatment of each alignment films 12a, 12b.Liquid crystal molecule in the liquid crystal layer 18 with the near interface of each liquid- crystalline polymer film 14a, 14b, become respectively along state of orientation at the direction of the friction treatment of alignment films 12a, 12b, and form the then subvertical state of orientation of approaching more central authorities, form on the whole and between substrate 10a and substrate 10b, bend to arciform state of orientation (curved orientation state).In addition, in ocb mode, the initial orientation that has becomes the injection orientation, in this case, liquid crystal layer 18 is applied voltage, makes shown in Fig. 2 (C) and carries out the transition to curved orientation.
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, it is reverse direction (antiparallel state) that each substrate 10a, 10b are configured to make the direction at the friction treatment of each alignment films 12a, 12b.Liquid crystal molecule in the liquid crystal layer 18 with the near interface of each liquid- crystalline polymer film 14a, 14b, become respectively along state of orientation, form the state that forms certain even angle orientation with the one side of each substrate 10a and substrate 10b on the whole at the direction of the friction treatment of alignment films 12a, 12b.
Below, according to Fig. 3, be example with the liquid crystal indicator of above-mentioned TN pattern, describe the optical compensation function that utilizes the liquid-crystalline polymer film that constitutes the orientation limitations layer to realize in detail.Fig. 3 be schematically represent in the liquid crystal indicator of TN pattern liquid crystal layer 18 and across each liquid-crystalline polymer film 14a of liquid crystal layer 18 arranged opposite, the figure of 14b.In Fig. 3, schematically show the state of orientation of liquid crystal molecule of the inside of each liquid- crystalline polymer layer 14a, 14b and liquid crystal layer 18.Specifically, Fig. 3 (A) expression is from the schematic cross section of observed liquid crystal layer 18 grades of certain direction, and Fig. 3 (B) expression is from differing the schematic cross section of observed liquid crystal layer 18 grades of direction of 90 degree with situation shown in Fig. 3 (A).
Shown in each accompanying drawing, be disposed at the liquid-crystalline polymer layer 14a and the liquid-crystalline polymer layer 14b that is disposed at the downside of liquid crystal layer 18 of the upside of liquid crystal layer 18, the state of orientation of the liquid crystal molecule that it is inherent all is to 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 as shown in the figure TN pattern.But liquid-crystalline polymer layer 14a, the 14b of present embodiment is different with the structure that is considered to bring the O sheet of effective optical compensation effect.That is, the optic axis of liquid-crystalline polymer layer 14a is substantially parallel with the direction of orientation of the liquid crystal molecule of the liquid crystal layer 18 of the near interface that is positioned at liquid-crystalline polymer layer 14a and liquid crystal layer 18.And the side that the state of orientation of inherent liquid crystal molecule is subvertical state among the liquid-crystalline polymer layer 14a contacts with liquid crystal layer 18.The liquid-crystalline polymer layer 14a of this structure brings optical compensation effect to the part of the opposition side (near the side of liquid-crystalline polymer layer 14b) that is positioned at this liquid-crystalline polymer layer 14a in liquid crystal layer 18 integral body.Liquid-crystalline polymer layer 14b is also identical.That is, liquid-crystalline polymer layer 14b brings optical compensation effect to the part of the opposition side (near the side of liquid-crystalline polymer layer 14a) that is positioned at this liquid-crystalline polymer layer 14b in liquid crystal layer 18 integral body.Therefore, compare with the O sheet that was considered to the best in the past, the liquid-crystalline polymer layer 14a of present embodiment, the optical compensation effect of 14b may not increase.But the liquid crystal indicator with liquid- crystalline polymer layer 14a, 14b of present embodiment is compared with the liquid crystal indicator that does not have optical compensation films, and visual characteristic is good at least.
According to above-described present embodiment, can set tilt angle in the broader context and obtain liquid crystal indicator.By adopting the orientation limitations layer of present embodiment, except each topology example shown in Figure 2, also can realize brand-new display mode etc. easily, need the liquid crystal indicator of the display mode of higher tilt angle.
And,, also can utilize as the key element of orientation limitations layer and be located at the liquid-crystalline polymer layer on the substrate and obtain optical compensation function according to present embodiment.Thus, compare, have the advantage of the structure that can simplify liquid crystal indicator with the sheet that is provided for obtaining optical compensation function in addition.
Below, several embodiment of present embodiment are described.
(embodiment 1)
Preparation is formed with a pair of glass substrate of the transparency electrode that is made of ITO (tin indium oxide) film.The thickness of ITO film is
(dust), the thickness of glass substrate are 0.7mm, and glass material is an alkali-free glass.Clean these glass substrates, by common lithography step the ITO film is carried out figure then and be processed into reservation shape.Here, the engraving method of ITO film adopts Wet-type etching (iron chloride).
Then, on glass substrate, form alignment films.Here, alignment films adopts common horizontal alignment film.The coating of aligning film material on glass substrate adopts spin-coating method to carry out.Specifically, implement 5 seconds spin coating, implement 10 seconds spin coating then with 4000rpm with 2000rpm.In addition, also can adopt methods such as flexible printing and ink jet printing.Then, at the alignment films that is applied on the glass substrate, utilize cleaning oven to carry out 250 ℃, 1 hour thermal treatment.
Then, carried out friction treatment at alignment films.Said friction is to instigate the cylindric roller high speed rotating that has twined cloth, utilizes this roller to come the processing of wiping alignment films.By carrying out this friction, alignment films has the liquid crystal molecule that will be in contact with it is arranged (orientation) along a direction effect.Here, with two substrate arranged opposite the time, handle the mutually different state of direction (antiparallel state) that has carried out friction to become.
Then, coating ultraviolet hardening liquid crystal liquid crystal property monomer material has formed liquid crystal liquid crystal property monomer film (light-cured type liquid crystal liquid crystal property monomer film) on alignment films.Here, implemented spin coating (2000rpm, 25 seconds).After this liquid crystal liquid crystal property monomer film is placed certain hour,, thus the liquid crystal liquid crystal property monomer film is converted to the liquid-crystalline polymer film to whole irradiation ultraviolet radiation of film.Ultraviolet irradiation carries out under air atmosphere.
Then, two glass substrates are overlapped at preposition, and use epoxy resin to fix, realize blocking thus.In the present embodiment, two glass substrates have been disposed, so that obtain the liquid crystal indicator of the homogeneous pattern shown in above-mentioned Fig. 2 (D).Draw the thick nurse of 25 μ m mylar to be inserted between two glass substrates as partition member.Then, adopt the injection method that has utilized capillarity, in the gap of two glass substrates, inject liquid crystal material.Thus, between two glass substrates, formed liquid crystal layer.It is 5CB that liquid crystal material adopts common nematic liquid crystalline material.
In the present embodiment, having applied standing time behind the liquid crystal liquid crystal property monomer film, rayed amount, investigate the relation of these parameters and the tilt angle that utilizes the liquid-crystalline polymer layer to give respectively as parameter.Be described in detail these results below.
Fig. 4 is the figure that expression has applied the relation of standing time behind the liquid crystal liquid crystal property monomer film and tilt angle.In addition, suitably be set at 1 minute standing time～30 minutes, ultraviolet irradiation amount is fixed as 5000mJ/cm
2Condition.Which no matter learn as shown in Figure 4, be standing time, can both obtain the higher tilt angle of ratio about 7 °～10 °.And, do not find the big dependence of resulting tilt angle to standing time.Like this, bigger with respect to the surplus of standing time, this is very favorable factor in the mill.
Fig. 5 is the figure of the relation of expression rayed amount and tilt angle.In addition, ultraviolet irradiation amount suitably is set at 1000mJ/cm
2～5000mJ/cm
2Between, will be fixed as standing time 1 minute.As shown in Figure 5, find that tilt angle and rayed amount have very big dependence, and found the rayed amount high more trend of tilt angle more at least.Learn according to Fig. 5, by the end of general 3500mJ/cm
2Scope in, tilt angle from about 50 °～60 ° continuously (substantially linear ground) change to about 10 °.Learn thus and can control tilt angle in the broader context according to the rayed amount.By adjusting the setting of light irradiation device, can change the rayed amount easily, thereby can be described as manageable in the mill parameter.
In addition, in Fig. 4, Fig. 5, the deviation when the deviation bar is represented to estimate a plurality of samples (each Unit 4).This deviation has the low more then more little trend of tilt angle.The similar trend of the deviation of the tilt angle in this trend and the common alignment films.But when 50 °～60 ° this very high tilt angles, deviation is about ± and 5 °, learn and can realize better orientation control.And the state of orientation of the liquid crystal indicator of present embodiment is stable, does not find magnetic hysteresis etc. in electric optical characteristics, and does not find to show uneven when visualization.
(embodiment 2)
Preparation is formed with a pair of glass substrate of the transparency electrode that is made of ITO (tin indium oxide) film.The thickness of ITO film is
(dust), the thickness of glass substrate are 0.7mm, and glass material is an alkali-free glass.Clean these glass substrates, by common lithography step the ITO film is carried out figure then and be processed into reservation shape.Here, the engraving method of ITO film adopts Wet-type etching (iron chloride).
Then, on glass substrate, form alignment films.Here, alignment films adopts the horizontal alignment film with the effect of giving lower tilt angle.The coating of aligning film material on glass substrate undertaken by flexible printing.Then, at the alignment films that is applied on the glass substrate, utilize cleaning oven to carry out 220 ℃, 1 hour thermal treatment.
Then, carried out friction treatment at alignment films.Here, with two substrate arranged opposite the time, handle to become the mutually different state of direction (antiparallel state) that has carried out friction that makes.
Then, on alignment films, apply ultraviolet hardening liquid crystal liquid crystal property monomer material, formed liquid crystal liquid crystal property monomer film (light-cured type liquid crystal liquid crystal property monomer film) by spin coating.Here, adopt the material different with the foregoing description 1.The condition of spin coating can be set rotating speed changeably between 1000rpm～3000rpm, be 30 seconds with time set.After this liquid crystal liquid crystal property monomer film is placed certain hour (all being 1 minute in the present embodiment),, thus the liquid crystal liquid crystal property monomer film is converted to the liquid-crystalline polymer film to whole irradiation ultraviolet radiation of film.The rayed amount is 8400mJ/cm
2(illumination of shining 2 minutes is 70W/cm
2Ultraviolet ray).And the ultraviolet irradiation in the present embodiment is to carry out under any atmosphere in air atmosphere or in the nitrogen atmosphere.In ultraviolet hardening liquid crystal liquid crystal property monomer material, also exist in the material that (state that contains oxygen) is not easy to carry out the polymerization materialization in the air.In this material, even the enough ultraviolet ray of irradiation in air sometimes, the film of air interface can full solidification yet, and presents the surface state with cementability of glutinous sticky paste.The material of Cai Yonging is the material that also reacts in air in the present embodiment, the atmosphere in the time of still need noting the ultraviolet ray irradiation according to material.
Then, two glass substrates are overlapped at preposition, realize blocking thus.In the present embodiment, two glass substrates have been disposed, so that obtain the liquid crystal indicator of the homogeneous pattern shown in above-mentioned Fig. 2 (D).Specifically, utilize dry type to scatter method, scatter the clearance control agent on the one side of a glass substrate in two glass substrates.The plastic bead (small pearl) of particle diameter 6 μ m is adopted in the clearance control agent, but also can adopt true stone ball.And, on the one side of another glass substrate, formed primary seal pattern (and conducting member pattern).Here be to have adopted silk screen print method, but also can adopt divider (displacer) etc.Sealant has adopted heat cured sealant, but also can be the sealant of sealant, photo-thermal and the type of using of light solidity.The particle diameter of having sneaked into several % in the sealing agent is the glass fibre of 6 μ m.And the conducting parts that will comprise gold bead etc. are printed on preposition.Here, the material that obtains behind the gold bead of the big approximately 1 μ m of particle diameter of the glass fibre of narrating previously of having sneaked into several % in sealant and this glass fibre of particle diameter ratio as the conducting parts, is carried out serigraphy.Then, two glass substrates are overlapped make blocking, and in punching press state under make sealant cures by thermal treatment.Here, utilize hot stamped process to carry out heat curing (150 ℃ of sintering).
Then, utilize vacuum impregnation in the gap of two glass substrates, to inject liquid crystal material.Thus, between two glass substrates, formed liquid crystal layer.Liquid crystal material adopts common nematic liquid crystalline material.After injecting liquid crystal material, utilize final sealant that inlet is sealed.And, neat in order to make state of orientation, the unit is heated to more than the phase inversion temperature of liquid crystal material.Here, the thermal treatment that utilizes baking oven to carry out 120 ℃, 30 minutes.And,, pasted the polarization plate that is cut into predetermined size in advance with predetermined angle in the outside of each glass substrate.
At the liquid crystal display cells of such making, mensuration, the microscopic examination of electric optical characteristics and tilt angle have been carried out.In the scope of 20mm * 25mm, measured tilt angle per 9 points.Its result is as follows.
Sample 1
Rotating speed during spin coating: 1000rpm (thickness
)
During rayed: nitrogen atmosphere
37.7 ° of → tilt angles (35.5 °～40.7 °)
Sample 2
Rotating speed during spin coating: 1000rpm (thickness
)
During rayed: air atmosphere
40.4 ° of → tilt angles (37.5 °～43.4 °)
Sample 3
Rotating speed during spin coating: 2000rpm (thickness
)
During rayed: air atmosphere
31.7 ° of → tilt angles (29.4 °～34.2 °)
Sample 4
Rotating speed during spin coating: 3000rpm (thickness
)
During rayed: nitrogen atmosphere
22.8 ° of → tilt angles (22.0 °～23.7 °)
Rotating speed during spin coating: 3000rpm (thickness
)
During rayed: air atmosphere
26.8 ° of → tilt angles (24.9 °～28.5 °)
According to above result as can be known, by adopting the liquid-crystalline polymer layer of the ultraviolet hardening liquid crystal liquid crystal property monomer material formation different, also can control tilt angle energetically with embodiment 1.That is, confirmed that the liquid-crystalline polymer layer is not the phenomenon that is confined to specific ultraviolet hardening liquid crystal liquid crystal property monomer material to the control performance of tilt angle.And the state of orientation of the liquid crystal indicator of present embodiment is stable, does not find that electric optical characteristics has magnetic hysteresis etc., and does not find to show uneven when visualization.Atmosphere gas when shining about ultraviolet ray does not have to find bigger difference in air atmosphere and in the nitrogen atmosphere.But,, found the smaller trend of the deviation in the nitrogen atmosphere about the deviation of tilt angle.That is, in nitrogen atmosphere, carry out the ultraviolet ray irradiation, might be able to suppress the deviation of tilt angle.
(distortion of embodiment etc.)
In addition, the invention is not restricted to the content of above-mentioned embodiment and each embodiment, can carry out various distortion and enforcement without departing from the spirit and scope of the present invention.For example, the numerical value of creating conditions etc. that suitably illustrates in the above description is an example, but is not limited to these numerical value.And, in above-mentioned liquid crystal indicator, be provided with orientation limitations layer respectively with alignment films and liquid-crystalline polymer film at the 1st substrate, the 2nd substrate, but have only substrate to need also can only above-mentioned orientation limitations layer be set in the liquid crystal indicator etc. of display mode of higher tilt angle at a substrate in employing.And, in the above description, show horizontal alignment film as an example of the alignment films that constitutes the orientation limitations layer, but alignment films also can adopt vertical alignment layer.
Claims (4)
1. liquid crystal indicator comprises:
The 1st substrate and the 2nd substrate with each other one side arranged opposite;
Be located at the 1st orientation limitations layer of the described one side side of described the 1st substrate;
Be located at the 2nd orientation limitations layer of the described one side side of described the 2nd substrate; And
Be located at described the 1st substrate and described the 2nd substrate liquid crystal layer each other,
At least one side of described the 1st orientation limitations layer or described the 2nd orientation limitations layer has:
Alignment films; And
Be located on the described alignment films and the liquid-crystalline polymer film that contacts with described liquid crystal layer.
2. liquid crystal indicator according to claim 1, described alignment films is a horizontal alignment film.
3. liquid crystal indicator according to claim 1 and 2, described liquid-crystalline polymer film are to make film after the light-cured type liquid crystal liquid crystal property monomer membrane fussion materialization by rayed.
4. the manufacture method of a liquid crystal indicator comprises:
The 1st step forms the 1st orientation limitations layer in the one side of the 1st substrate;
The 2nd step is configured to make one side each other opposed described the 1st substrate and the 2nd substrate;
The 3rd step forms liquid crystal layer between described the 1st substrate and described the 2nd substrate,
Described the 1st step comprises:
On the one side of described the 1st substrate, form the step of alignment films;
On described alignment films, form the step of light-cured type liquid crystal liquid crystal property monomer film;
By described light-cured type liquid crystal liquid crystal property monomer film is carried out the step that rayed forms the liquid-crystalline polymer film.
Applications Claiming Priority (2)
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|---|---|---|---|
| JP2009-216853 | 2009-09-18 | ||
| JP2009216853A JP5583940B2 (en) | 2009-09-18 | 2009-09-18 | Liquid crystal display device and method of manufacturing liquid crystal display device |
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|---|---|
| JP (1) | JP5583940B2 (en) |
| KR (1) | KR101698142B1 (en) |
| CN (1) | CN102023414B (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109643013A (en) * | 2016-10-28 | 2019-04-16 | 株式会社Lg化学 | Transmission-variable film |
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| 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 |
| 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 |
| JP2009086296A (en) * | 2007-09-28 | 2009-04-23 | Sharp Corp | Manufacturing method of liquid crystal display panel |
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| JPS63129323A (en) * | 1986-11-20 | 1988-06-01 | Asahi Glass Co Ltd | Liquid crystal display element |
| KR100376378B1 (en) * | 1994-09-30 | 2003-06-09 | 로크웰 인터내셔널 코포레이션 | Organic polymer O-plate compensator to improve gray scale performance in twisted nematic liquid crystal display |
| JP3403093B2 (en) * | 1998-10-21 | 2003-05-06 | 三菱重工業株式会社 | Method and equipment for producing reduced iron |
| 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 |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000122066A (en) * | 1998-10-21 | 2000-04-28 | Hitachi Ltd | Liquid crystal display device |
| 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 |
| JP2003172935A (en) * | 2001-12-07 | 2003-06-20 | Seiko Epson Corp | Liquid crystal device, manufacturing method for liquid crystal device and electronic instrument |
| JP2009086296A (en) * | 2007-09-28 | 2009-04-23 | Sharp Corp | Manufacturing method of liquid crystal display panel |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109643013A (en) * | 2016-10-28 | 2019-04-16 | 株式会社Lg化学 | Transmission-variable film |
| CN109643013B (en) * | 2016-10-28 | 2021-10-26 | 株式会社Lg化学 | Transmittance variable film |
| US11614660B2 (en) | 2016-10-28 | 2023-03-28 | Lg Chem, Ltd. | Transmittance-variable film capable of controlling pretilt of liquid crystal interface |
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| JP2011065019A (en) | 2011-03-31 |
| KR20110031140A (en) | 2011-03-24 |
| JP5583940B2 (en) | 2014-09-03 |
| TW201115208A (en) | 2011-05-01 |
| CN102023414B (en) | 2015-12-02 |
| KR101698142B1 (en) | 2017-01-19 |
| TWI503600B (en) | 2015-10-11 |
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