CN101050366A - Liquid crystal composition and liquid crystal display including same - Google Patents

Liquid crystal composition and liquid crystal display including same Download PDF

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Publication number
CN101050366A
CN101050366A CNA2007100920507A CN200710092050A CN101050366A CN 101050366 A CN101050366 A CN 101050366A CN A2007100920507 A CNA2007100920507 A CN A2007100920507A CN 200710092050 A CN200710092050 A CN 200710092050A CN 101050366 A CN101050366 A CN 101050366A
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liquid
substrate
crystalline cpd
crystal composition
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金贤昱
柳在镇
损廷昊
桂明荷
石旻玖
赵植永
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Samsung Display Co Ltd
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Samsung Electronics Co Ltd
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    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K19/00—Liquid crystal materials
    • C09K19/04—Liquid crystal materials characterised by the chemical structure of the liquid crystal components, e.g. by a specific unit
    • C09K19/42—Mixtures of liquid crystal compounds covered by two or more of the preceding groups C09K19/06 - C09K19/40
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K19/00—Liquid crystal materials
    • C09K19/04—Liquid crystal materials characterised by the chemical structure of the liquid crystal components, e.g. by a specific unit
    • C09K19/06—Non-steroidal liquid crystal compounds
    • C09K19/08—Non-steroidal liquid crystal compounds containing at least two non-condensed rings
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K19/00—Liquid crystal materials
    • C09K19/04—Liquid crystal materials characterised by the chemical structure of the liquid crystal components, e.g. by a specific unit
    • C09K19/06—Non-steroidal liquid crystal compounds
    • C09K19/08—Non-steroidal liquid crystal compounds containing at least two non-condensed rings
    • C09K19/10—Non-steroidal liquid crystal compounds containing at least two non-condensed rings containing at least two benzene rings
    • C09K19/12—Non-steroidal liquid crystal compounds containing at least two non-condensed rings containing at least two benzene rings at least two benzene rings directly linked, e.g. biphenyls
    • 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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Abstract

Disclosed is a liquid crystal display that includes a first substrate, a second substrate facing the first substrate, a pair of field generating electrodes formed on at least one of the first substrate and the second substrate, and a liquid crystal layer interposed between the first substrate and the second substrate. The liquid crystal layer comprises a liquid crystal composition that includes a first class having at least one fluorine atom, and a second class containing a neutral compound. The second class includes a first sub-class and a second sub-class. The first sub-class contains a liquid crystal compound having at least one selected from an alkyl group and an alkoxy group having C1 to C5 in a terminal group thereof. The second sub-class contains a liquid crystal compound having an alkenyl group having C1 to C5 in terminal groups thereof. The second sub-class is contained in a content of about 7 wt % or less of a total content of the liquid crystal composition.

Description

Liquid-crystal composition and comprise its liquid-crystal display
The cross reference of related application
The application requires right of priority and the rights and interests in the korean patent application No.10-2006-0030552 of Korea S Department of Intellectual Property submission on April 4th, 2006, and its full content is incorporated this paper by reference into.
Technical field
The present invention relates to liquid-crystal composition and the liquid-crystal display that comprises it.
Background technology
At present, liquid-crystal display (LCD) is the most widely used flat-panel monitor.LCD has two display panels, forms a generating electrodes such as pixel electrode and common electrode therein, and insert liquid crystal layer between plate.In LCD, the field generating electrodes is applied voltage with the generation electric field, and by the arrangement of electric field decision liquid crystal molecule in liquid crystal layer.Therefore, controlled the transparence of passing liquid crystal layer.
In LCD, liquid crystal is extremely important for obtain desirable image by the control transparence for.Particularly, according to the difference of LCD purposes, require to have different characteristics, as low-voltage driving, high pressure keeps than (VHR), wide viewing angle characteristics, wide operating temperature range and high-speed response.
Liquid crystal layer comprises liquid-crystal composition, and wherein polytype liquid crystal components mixes to satisfy above-mentioned different characteristic.
Yet, except that liquid-crystal composition, in liquid crystal layer, comprise a large amount of ionic impurities.The electric field that ionic impurity can form in the liquid crystal layer laterally (laterally) transmits and is enriched in prospective region, as the border of field generating electrodes.In this case, the zone of enrichment dopant ion can be considered the afterimage from the outside.
Summary of the invention
The invention provides liquid-crystal composition and the liquid-crystal display that comprises it, this liquid-crystal display has the advantage of the afterimage that reduces liquid-crystal display.
Embodiment of the present invention provides the liquid-crystal composition that comprises the first kind and second class, and the first kind comprises the liquid crystalline cpd with at least one fluorine atom, and second class comprises at least a liquid crystalline cpd by formula I, II and III representative.
Figure A20071009205000111
Liquid crystalline cpd by formula I, II and III representative has end group R 1-R 6, R 1-R 6Each self-contained C 1-C 5In alkyl, alkoxyl group and the alkenyl one.Second class comprises first subclass and second subclass.First subclass is included in the liquid crystalline cpd of no alkenyl on its end group, and second subclass is included in the liquid crystalline cpd that has alkenyl on its end group.In one embodiment, second subclass is about 7 weight % of first subclass and the second subclass total amount or still less.
The first kind can be about 40-80 weight % of liquid-crystal composition total amount, and second class can be about 20-60 weight % of liquid-crystal composition total amount.
The first kind can comprise at least a liquid crystalline cpd by formula IV-X representative.
Figure A20071009205000121
R 7-R 16Can comprise separately and be selected from one of C1-C5 alkyl and alkoxyl group.
Execute mode the liquid-crystal composition that comprises the first kind and second class is provided for another real of the present invention, the first kind comprises the liquid crystalline cpd with at least one fluorine atom, and second class comprises at least a liquid crystalline cpd by formula I, II and III representative.
Figure A20071009205000122
Liquid crystalline cpd by I, II and III representative has end group R 1-R 6, R 1-R 6Each self-contained C1-C5 alkyl and alkoxyl group, second class is not included in the liquid crystalline cpd that has alkenyl on its end group.
The first kind can be about 40-80 weight % of liquid-crystal composition total amount, and second class can be about 20-60 weight % of liquid-crystal composition total amount.
The first kind can comprise at least a liquid crystalline cpd by formula IV-X representative.
Figure A20071009205000131
R 7-R 16Can comprise separately and be selected from one of C1-C5 alkyl and alkoxyl group.
Another embodiment of the present invention provides liquid-crystal display, it comprise first substrate, in the face of second substrate of first substrate, a pair of the generating electrodes that forms at least one of first substrate and second substrate and insert first substrate and second substrate between liquid crystal layer.Liquid crystal layer comprises the liquid-crystal composition that comprises the first kind and second class, and the first kind comprises the liquid crystalline cpd with at least one fluorine atom, and second class comprises at least a liquid crystalline cpd by formula I, II and III representative.
Figure A20071009205000141
Liquid crystalline cpd by formula I, II and III representative has end group R 1-R 6, R 1-R 6Each self-contained of being selected from C1-C5 alkyl, alkoxyl group and the alkenyl.Second class comprises first subclass and second subclass.The liquid crystalline cpd and second subclass that first subclass is included in no alkenyl on its end group are included in the liquid crystalline cpd that has alkenyl on its end group.In one embodiment, second subclass is about 7 weight % of the first kind and the second class total amount or still less.
In one embodiment, the first kind can be about 40-80 weight % of liquid-crystal composition total amount, and second class can be about 20-60 weight % of liquid-crystal composition total amount.
The first kind can comprise at least a liquid crystalline cpd by formula IV-X representative.
Figure A20071009205000142
R 7-R 16Each self-contained one of C1-C5 alkyl and alkoxyl group of being selected from.
Liquid-crystal display can further be included in first and second signal wires that intersect on first substrate and be connected to thin film transistor on first and second signal wires.
Liquid-crystal display can further comprise and is used for determining that the vergence direction of liquid crystalline cpd vergence direction in the liquid crystal layer determines element.In one embodiment, vergence direction determines that element can comprise the projection (protrusion) that forms on the otch (cutout) that forms in the generating electrodes on the scene or the generating electrodes on the scene.
According to the embodiment of the present invention, liquid-crystal display comprises first substrate, in the face of second substrate of first substrate, a pair of generating electrodes at least one of first substrate and second substrate, forming, and be inserted into liquid crystal layer between first substrate and second substrate.Liquid crystal layer comprises the liquid-crystal composition that comprises the first kind and second class, and the first kind comprises the liquid crystalline cpd with at least one fluorine atom, and second class comprises the liquid crystalline cpd shown in formula I, II or the III.
Figure A20071009205000152
Figure A20071009205000161
Liquid crystalline cpd shown in formula I, II and the III has end group R 1-R 6, R 1-R 6Each self-contained C1-C5 alkyl or alkoxyl group, second class is not included in the liquid crystalline cpd that has alkenyl on its end group.
The first kind can be about 40-80 weight % of liquid-crystal composition total amount, and second class can be about 20-60 weight % of liquid-crystal composition total amount.
The first kind can comprise at least a liquid crystalline cpd shown in the formula IV-X.
Figure A20071009205000162
Figure A20071009205000171
R 7-R 16Can comprise separately and be selected from one of C1-C5 alkyl and alkoxyl group.
Can use ordinary method to prepare the above-mentioned liquid crystalline cpd of representing to formula X by formula I respectively.
Liquid-crystal display can further be included in first and second signal wires that intersect on first substrate and be connected to thin film transistor on first and second signal wire.
Liquid-crystal display can comprise further that the vergence direction of the vergence direction that is used for determining the liquid crystalline cpd in the liquid crystal layer determines element.In one embodiment, vergence direction determines that element can comprise the projection that forms on the otch that forms in the generating electrodes on the scene or the generating electrodes on the scene.
Description of drawings
Fig. 1 is the layout of the film transistor array plate that is used for liquid-crystal display (array panel) according to embodiment of the present invention;
Fig. 2 is the layout according to the common electrode plate that is used for liquid-crystal display (commonelectrode panel) of embodiment of the present invention;
Fig. 3 is the layout of liquid-crystal display that comprises the common electrode plate of the film transistor array plate of Fig. 1 and Fig. 2;
Fig. 4 and Fig. 5 are that the liquid-crystal display of Fig. 3 is respectively along the sectional view of line IV-IV and V-V; With
Fig. 6 is the synoptic diagram of line afterimage evaluation result.
Embodiment
Below, with the description that provides according to the liquid-crystal composition of embodiment of the present invention.Liquid-crystal composition comprises the plurality of liquid crystals with different physical characteristics.Described liquid crystal comprises the core group that forms central shaft and the end group and/or the side group that are connected on the core group.The core group can comprise the ring compound that is selected from phenyl, cyclohexyl and heterocyclic radical.End group and/or side group can comprise non-polar group such as alkyl, alkoxyl group and thiazolinyl, or comprise polar group such as fluorine atom (F), and its physicals depends on end group and/or side group.
Liquid-crystal composition according to embodiment of the present invention comprises: the fluorochemicals with dielectric anisotropy neutral compound and 2 that 1) does not have dielectric anisotropy).
Neutral compound can comprise one or more liquid crystalline cpds that are selected from following Formula I-III:
Figure A20071009205000181
In above-mentioned formula, R 1-R 6Separately can be identical or different, and can comprise one that is selected from C1-C5 alkyl, alkoxyl group or the thiazolinyl respectively.Work as R 1-R 6At least one when comprising thiazolinyl, the content that preferably comprises the compound of thiazolinyl is about 7 weight % of liquid-crystal composition total amount or still less.In addition, R most preferably 1-R 6Do not comprise thiazolinyl.In one embodiment, the content of neutral compound is about 20-60 weight % of liquid-crystal composition total amount.
Fluorochemicals can be and is selected among the following formula I V-X one or more:
Figure A20071009205000182
Figure A20071009205000191
In above-mentioned formula, R 7-R 16Separately can be identical or different, and can comprise one that is selected from C1-C5 alkyl or the alkoxyl group.The content of fluorochemicals can be about 40-80 weight % of liquid-crystal composition total amount in one embodiment.
As mentioned above, in embodiments of the present invention, limited the content that has the neutral compound of alkenyl at its end group.That is to say, in one embodiment, liquid-crystal composition is not included in the neutral compound that comprises alkenyl on its end group, perhaps in another embodiment, if comprise neutral compound, then the content that end group comprises the neutral compound of alkenyl in the liquid-crystal composition is about 7 weight % of liquid-crystal composition total amount or still less.
When neutral compound comprised alkenyl on its end group, then the position of double bond of alkenyl can be the reflecting point of ionic impurity.Therefore, ionic impurity can be combined on the end group of neutral compound, even and also kept after having prepared liquid-crystal composition.During driving LCD, the electric field lateral transport that ionic impurity forms in the liquid crystal layer is arranged in prospective region, as the border of field generating electrodes.If ionic impurity is attached on the liquid crystal molecule, then changed refraction ansiotropy, cause the generation of line afterimage.
Therefore, in an embodiment of the invention, the content that is set in the neutral compound that has alkenyl in the end group is with the reaction of minimizing with ionic impurity.Therefore, can reduce the change on the liquid-crystal composition refraction ansiotropy that causes owing to ionic impurity, thereby improve line afterimage characteristic.
Can estimate the line afterimage by the following method.
At first, preparation comprises two plates with generating electrodes and the test indicating meter that inserts liquid crystal layer therebetween.In the test indicating meter, arrange a plurality of pixels.In a plurality of pixels, some pixels are arranged horizontally and vertically successively and are represented by black, and rest of pixels is represented by white, thereby cancellate black/white pattern is set.Then, at the fixed time after, remove the black/white pattern, and when using even GTG from black to white to change whole test indicating meter, check whether can recognize the wire spot on the border of each pixel.Measurement is up to the wire spot obvious visible time (hereinafter referred to as " the line afterimage shows the time ").The line afterimage shows how long LCD is driven and the index of wireless afterimage.The line afterimage shows that the time is long more, and then line afterimage characteristic is good more.
Fig. 6 is the synoptic diagram of display line afterimage evaluation result.
In the drawings, the x axle is to have the neutral compound of alkenyl and the ratio of liquid-crystal composition total amount on its end group, and the y axle is that the line afterimage shows the time.
As shown in FIG., when not existing in the neutral compound that has alkenyl on the end group, i.e. when the ratio in neutral compound that has alkenyl on its end group and liquid-crystal composition total amount is 0 (shown on the x axle), the line afterimage demonstration time is about 3000 hours.
Simultaneously, when the content of the neutral compound that has alkenyl on its end group increased, the line afterimage demonstration time significantly reduced.Particularly, when the content of the neutral compound that has alkenyl on its end group surpasses about 7 weight %, proved that the line afterimage demonstration time is reduced to less than about 2000 hours.
As mentioned above, in embodiments of the present invention,, can guarantee that then the line afterimage demonstration time is about 2000 hours or bigger when the content of the neutral compound that has alkenyl on its end group is about 7 weight % of liquid-crystal composition total amount or still less the time.The content of preferred this neutral compound is about 4 weight % or littler, more preferably is not included in the neutral compound that has alkenyl on its end group.
In addition, the liquid-crystal composition of identity basis embodiment of the present invention has the high line afterimage demonstration time, and also has dielectric anisotropy, refraction ansiotropy and rotary viscosity (rotational viscosity) characteristic of expectation.
In one embodiment, dielectric anisotropy (Δ ε) with liquid-crystal composition of positive dielectric anisotropy is about 0.060-0.180 for pact+3～+ 20, refraction ansiotropy (Δ n), with rotary viscosity be about 50-250mPas, and the dielectric anisotropy with liquid-crystal composition of negative dielectric anisotropic is that about 0.075-0.109 and rotary viscosity are about 87-165mPas for pact-2.7～-5.8, refraction ansiotropy.
Below, will be described in detail with reference to the attached drawings embodiments of the present invention, thereby those skilled in the art can easily realize the present invention.Just as understood by the skilled person in the art, can multitude of different ways change described embodiment, and institute changes and does not break away from the spirit or scope of the present invention.
In the accompanying drawings, for the sake of clarity amplified the thickness in layer, film, plate, zone etc.In whole specification sheets, identical Reference numeral is represented components identical.Be appreciated that when claim element such as layer, film, zone or substrate another element " on " time, can directly can there be plug-in unit in it on another element or also.On the contrary, when claim element " directly exist " another element " on " time, then do not have plug-in unit.Now, with reference to figure 1-5, the liquid-crystal display according to embodiment of the present invention is provided detailed description.
Fig. 1 is the film transistor array plate layout that is used for according to the liquid-crystal display of embodiment of the present invention, Fig. 2 is the layout that is used for according to the common electrode plate of the liquid-crystal display of embodiment of the present invention, Fig. 3 is the layout that comprises the liquid-crystal display of Fig. 1 film transistor array plate and Fig. 2 common electrode plate, and Fig. 4 and 5 is respectively the sectional view of Fig. 3 liquid-crystal display along line IV-IV and V-V.
With reference to figure 1-5, comprise film transistor array plate 100 (Fig. 4) and the common electrode plate 200 (Fig. 4) that faces with each other according to the LCD of embodiment of the present invention, and be inserted into the liquid crystal layer 3 (Fig. 4) between two boards 100 and 200.
At first, with reference to figure 1,3,4 and 5 film transistor array plate 100 is described.
On the insulated substrate 110 that forms by for example transparent glass or plastics, form a plurality of gate lines 121 and a plurality of storage electrode line 131.
Gate line 121 transmits signal, and extends in the horizontal direction basically.Every gate line 121 comprises a plurality of grids that project upwards 124 and has wide end so that the end 129 that is connected with other layers or external drive circuit.The gate driver circuit (not shown) that is used to produce signal can be configured in the flexible printed circuit film (not shown) that is affixed on the substrate 110, also can directly be configured on the substrate 110, maybe can be integrated on the substrate 110.When gate driver circuit is when being integrated on the substrate 110, can extend gate line 121 so that be directly connected to gate driver circuit.
Predetermined voltage is applied on the storage electrode line 131, every storage electrode line 131 comprises almost and the main line (stem line) of gate line 121 extends parallel and a plurality of first, second, third and the 4th storage electrode 133a, 133b, 133c and 133d and a plurality of wire (connection) 133e that goes out from the main line upper branch.Every storage electrode line 131 is configured between two adjacent gate polar curves 121, and main line is near that top in two adjacent gate polar curves 121 root.
The first and second storage electrode 133a and 133b extend feasible facing with each other in vertical direction.The first storage electrode 133a have the inboardend that is connected on the main line and with the inboardend opposed free ends.Inboardend has projection.The third and fourth storage electrode 133c and 133d tilt to extend to upper end and the lower end of the second storage electrode 133b respectively from the center of the first storage electrode 133a.Wire 133e connects between the 133d at adjacent storage electrode 133a.Yet, can change the shape and the arrangement of storage electrode line 131 in many ways.
Gate line 121 and storage electrode line 131 can be made by low-resistance conductor, for example aluminiferous metals such as aluminium (Al) or aluminium alloy, contain silver metal as silver (Ag) or silver alloys, copper-containing metal such as copper (Cu) or copper alloy, contain molybdenum such as molybdenum (Mo) or molybdenum alloy, chromium (Cr), tantalum (Ta) or titanium (Ti).In addition, gate line 121 and storage electrode line 131 can have the multilayered structure of the dual electric layer (not shown) that comprises that physicals differs from one another.
The side surface of gate line 121 and storage electrode line 131 is with respect to the surface tilt of substrate 110, and in one embodiment, its pitch angle is preferably in about 30 °-80 ° scope.
On gate line 121 and storage electrode line 131, formed by silicon nitride (SiN x) or silicon-dioxide (SiO 2) gate insulator 140 made.
On gate insulator 140, a plurality of semiconductor bars 151 of making by amorphous silicon hydride (being abbreviated as hydrogenation a-Si) or polysilicon have been formed.Semiconductor bar 151 extends and has a plurality of projections 154 of stretching out to gate electrode 124 in vertical direction basically.
A plurality of ohmic contact bar (not shown)s and ohmic contact island 165 on semiconductor bar 151, have been formed.Each ohmic contact bar has a plurality of projections 163, and projection 163 is configured on the projection 154 of semiconductor bar 151 in pairs with ohmic contact island 165. Ohmic contact 163 and 165 can by material for example n+ hydrogenation a-Si or silicide make, this n+ hydrogenation a-Si is with n-type impurity such as phosphorus (P) heavy doping.
The side of semiconductor bar 151 and ohmic contact 163 and 165 is also with respect to the surface tilt of substrate 110, and in one embodiment, its pitch angle is in about 30 °-80 ° scope.
Ohmic contact 163 and 165 and gate insulator 140 on, form many data lines 171, a plurality of drain electrode 175 and a plurality of isolated tinsel 178.
Data line 171 data signal, and intersect with main line and wire 133e with gate line 121, storage electrode line 131 in the vertical direction extension basically.Every data lines 171 has a plurality of source electrodes 173 and the wide end 179 that is used to be connected other layers or external drive circuit that extend to gate electrode 124.The data drive circuit (not shown) that produces data voltage is configurable on the flexible printed circuit film (not shown) that sticks on the substrate 110, and it can directly be configured on the substrate 110, maybe can be integrated on the substrate 110.When data drive circuit was integrated on the substrate 110, data line 171 can directly be connected with data drive circuit.
Drain electrode 175 formed with data line 171 separates, and in the face of source electrode 173, between gate electrode 124 is set.Each drain electrode 175 have wide end and by source electrode 173 around bar-shaped end.
124, one source electrodes 173 of a gate electrode and drain electrode 175 form single thin film transistors (TFT) together with the projection 154 of semiconductor bar 151, form the raceway groove of thin film transistor between source electrode 173 and drain electrode 175 on projection 154.
Isolating metal sheet 178 is configured near on the gate line 121 of the first storage electrode 133a.
Identical with gate line 121, data line 171, drain electrode 175 and isolating metal sheet 178 can be made by low resistance conductor.
The side of data line 171, drain electrode 175 and isolating metal sheet 178 is also with respect to the surface tilt of substrate 110, and in one embodiment, its pitch angle is preferably in about 30 °-80 ° scope.
Ohmic contact 163 and 165 is below semi-conductor striped 151 only, and forms between top data line 171 and the drain electrode 175, thereby reduces contact resistance therebetween.
On the exposed region of data line 171, drain electrode 175, isolating metal sheet 178 and semi-conductor striped 151, form passivation layer 180.Passivation layer 180 can be made by inorganic insulator or organic insulator.Its surface can be flattened.The embodiment of inorganic insulator comprises silicon nitride and silicon-dioxide.Organic insulator can have photosensitivity, and preferred specific inductivity is about 4.0 or littler.Yet passivation layer 180 can have the bilayer structure of inorganic bottom and organic top layer, thereby has the insulating property of the excellence of dielectric layer, and does not damage the exposed region of semi-conductor striped 151.
On passivation layer 180, form a plurality of pixel electrodes 191, a plurality of bridge (overpass) 83 and a plurality of subsidiaries (contact assistants) 81 and 82 that contact of striding.Pixel electrode 191, stride bridge 83 and contact subsidiary 81 and 82 and can make, or make by reflective metals such as Al, Ag, Cr or its alloy by transparent conductive material such as tin indium oxide (ITO) or indium zinc oxide (IZO).
With drain electrode 175 physical connections be electrically connected, 191 apply data voltage from drain electrode 175 to pixel electrode by contact hole 185 for pixel electrode 191.The pixel electrode 191 that has applied data voltage forms electric field together with the common electrode 270 of the common electrode plate 200 that has applied common voltage, thereby decision is inserted into the direction of the liquid crystal molecule 310 of the liquid crystal layer 3 between two electrodes 191 and 270.The polarized light that passes liquid crystal layer 3 changes according to the determined direction of liquid crystal molecule 310.Pixel electrode 191 and common electrode 270 form electrical condenser (hereinafter referred to as " liquid crystal capacitor "), even also can keep impressed voltage after closing thin film transistor.
Pixel electrode 191 comprises that the storage electrode line 131 of storage electrode 133a-133b overlaps.The drain electrode 175 of pixel electrode 191 and electrical connection pixel electrode 191 overlaps to form electrical condenser with storage electrode line 131.This electrical condenser is called " storage capacitor ".Storage capacitor improves the voltage of liquid crystal capacitor and keeps performance.
Each pixel electrode 191 has basically four the main limits parallel with gate line 121 or data line 171, four jiaos of the pixel electrode of cutting sth. askew.Therefore, pixel electrode almost is an orthogonal.In one embodiment, the angle with respect to gate line 121 of each chamfered edge of pixel electrode 191 is about 45 °.Pixel electrode 191 has center cut (cutout) 91, lower cut-out 92a and upper cut-out 92b, and is divided into a plurality of parts by otch 91-92b.Otch 91-92b is basically with respect to the dummy level medullary ray unsymmetrically (inversely symmetric) of dividing pixel electrode 191 equally.
Lower cut-out 92a and upper cut-out 92b tilt to extend between the right flank of pixel electrode 191 and left surface and overlap with the 3rd storage electrode 133c and the 4th storage electrode 133d.Lower cut-out 92a and upper cut-out 92b are placed in bottom and top respectively with respect to the horizontal center line of pixel 191.Lower cut-out 92a and upper cut-out 92b are perpendicular to one another and form about 45 ° with respect to gate line 121.
Center cut 91 is extended and have an opening that forms on its right flank along the horizontal center line of pixel electrode 191.The opening of center cut 91 has parallel with upper cut-out 92b with lower cut-out 92a basically pair of angled limit.Center cut 91 has horizontal component and the pair of angled part that is connected with horizontal component.Horizontal component extends along the horizontal center line short range of pixel electrode 191, and the pair of angled part extends to the right flank of pixel electrode 191 from horizontal component, thereby is arranged essentially parallel to lower cut-out 92a and upper cut-out 92b.
Therefore, the lower part of pixel electrode 191 is divided into two zones by lower cut-out 92a, and upper section is divided into two zones by upper cut-out 92b.The number of zone or otch changes than the type of, liquid crystal layer 3 or characteristic etc. according to the length of the horizontal sides of the size of design factor such as pixel electrode 191, pixel electrode 191 and vertical edges.
Stride that bridge 83 intersects with gate line 121 and be connected to the expose portion and first storage electrode, the 133 free-ended exposed ends of storage electrode 131 by contact hole 183a and 183b, contact hole 183a and 183b toward each other, gate line 121 is betwixt.Storage electrode 133a and 133b, storage electrode line 131 and stride the defective that bridge 83 can be used to repair gate line 121, data line 171 or thin film transistor.
Contact subsidiary 81 and 82 is connected respectively to the end 129 of gate line 121 and the end 179 of data line 171 by contact hole 181 and 182.The end 129 of contact subsidiary 81 and 82 supply gate polar curves 121 and the end of data line 171 179 are adhered to external device (ED), and protect them.
Next, with reference to figure 2-4 common electrode plate 200 is described.
In one embodiment, on the insulated substrate 210 that forms by transparent glass or plastics, form shading element 220.Shading element 220 is called black matrix, and prevents the light leak between the pixel electrode 191.Shading element 220 pixel-oriented electrodes 191 also have a plurality of openings 225, and this opening 225 has the shape substantially the same with pixel electrode 191.Yet shading element 220 can have corresponding to the part of gate line 121 and data line 171 with corresponding to the part of thin film transistor.
In addition, on substrate 210, form a plurality of colour filters 230.Most of colour filter 230 be configured in by shading element 220 around the zone, and can extend in vertical direction along the row (colum) of pixel electrode 191.Each colour filter 230 can show a kind of in the three primary colors (as red, green and blue).
On colour filter 230 and shading element 220, form external coating (EC) 250.External coating (EC) 250 can be made by (organic) insulation composition, and it can prevent that colour filter 230 is exposed to the outside and flat surfaces is provided.External coating (EC) 250 is also can omitting of choosing wantonly.
On external coating (EC) 250, form common electrode 270.Common electrode 270 is made by transparent conductor such as ITO or IZO, and has formed a plurality of otch 71,72a, 72b in common electrode 270.
One group of otch 71-72b is towards a pixel electrode 191 and comprise center cut 71, lower cut-out 72a and upper cut-out 72b.Otch 71-72b is configured between the adjacent cut 91-92b of pixel electrode 191 or the otch 92a and the 92b of pixel electrode 191 and cut sth. askew between the side separately.In addition, otch 71-72b has the lower cut-out 92a of at least one substantially parallel pixel electrode 191 or upper cut-out 92b and the sloping portion that extends separately.Otch 71 and 72b are basically with respect to the horizontal center line unsymmetrically of pixel electrode 191.
Lower cut-out 72a and upper cut-out 72b have sloping portion, horizontal component and vertical component.The left surface that sloping portion extends to pixel electrode from the upper side or the downside of pixel electrode 191 basically.Horizontal component and vertical component extend from sloping portion is terminal along the side of pixel electrode 191, form the obtuse angle with the side overlapping of pixel electrode and with sloping portion simultaneously.
Center cut 71 has central horizontal part, pair of angled part and a pair of vertical vertical component.The central horizontal part left surface along the horizontal center line of pixel electrode 191 from pixel electrode 191 basically extends to its right flank.Pair of angled partly forms obtuse angle from the central horizontal part of pixel electrode 191 is terminal to right flank with respect to the central horizontal part, and is arranged essentially parallel to lower cut-out 72a and upper cut-out 72b extension.Vertically vertical component extends overlapping with the front from the end of corresponding sloping portion along the front of pixel electrode 191, and forms the obtuse angle with respect to sloping portion.
The number of otch 71-72b can change according to design factor.Shading element 220 can overlap to prevent otch 71-72b light leak on every side with otch 71-72b.
When common electrode 270 being applied common voltage and pixel electrode 191 applied data voltage, then produced the electric field that is substantially perpendicular to display panel 100 and 200 surfaces.In response to electric field, the direction of liquid crystal molecule 310 changes and makes the main shaft of liquid crystal molecule 310 perpendicular to the direction of electric field.
The side of otch 71-72b in electric field generating electrodes 191 and 270 and 91-92b and pixel electrode 191 makes electrical field deformation, thereby produces the horizontal component of the vergence direction of decision liquid crystal molecule 310.The horizontal component of electric field is substantially perpendicular to the side of otch 71-72b and 91-92b and the side of pixel electrode 191.
With reference to 3, one groups of otch 71-72b of figure and 91-92b pixel electrode 191 is divided into territory, a plurality of subprovince, each territory, corresponding subprovince has two main limits that become the inclination angle with the main limit of pixel electrode 191.The main limit in territory, subprovince and the polarization axle of polaroid 12 and 22 are into about 45 °, and this makes optical efficiency maximize.
Because the most of liquid crystal molecule in the territory, subprovince 310 forms with main edge-perpendicular, so vergence direction is about 4.Therefore, since the multiple direction of liquid crystal molecule 310, the benchmark visual angle (reference viewing angle) that has increased LCD.
Can change shape and the arrangement of otch 71-72b and 91-92b in many ways.
At least one the be highlighted (not shown) of otch 71-72b and 91-92b or pit (not shown) replace.Outstanding can making by organic materials or inorganic materials, and on configurable generating electrodes on the scene 191 and 270 or under.
Both alignment layers (alignment layer) 11 and 21 can be applied on the internal surface of display panel 100 and 200, and can be homeotropic alignment layer.
Polaroid 12 and 22 is configured on the outside surface of display panel 100 and 200, and the polarization axle of these two polaroids 12 and 22 (X, Y) be perpendicular to one another and with respect to the sloping portion of angular cutouts 92a and 92b and otch 71-72b into about 45 °.In the situation of reflective liquid-crystal display, can omit in polaroid 12 and 22.
LCD according to embodiment of the present invention can comprise further that the phase shift films (not shown) compensates the delay of liquid crystal layer 3.LCD can further comprise to polaroid 12 and 22, phase shift films, display panel 100 and 200, and liquid crystal layer 3 radiative luminescence unit (back light unit) (not shown)s.
Liquid crystal layer 3 has negative dielectric anisotropic, and is oriented the surface that makes when the not applying electric field main shaft of the liquid crystal molecule in the liquid crystal layer 3 310 be substantially perpendicular to two display panels 100 and 200.Therefore, incident light does not pass cross polarization sheet 12 and 22 and be blocked.
As mentioned above, liquid crystal layer 3 comprises liquid-crystal composition.In one embodiment, liquid-crystal composition comprises neutral compound with dielectric anisotropy and the fluorochemicals with dielectric anisotropy.
Neutral compound can be selected from one or more among following formula I-III.
Figure A20071009205000271
In above-mentioned formula, R 1-R 6Can comprise one that is selected from C1-C5 alkyl, alkoxyl group or the alkenyl separately.Yet, preferably do not comprise compound with alkenyl.When comprising the compound with alkenyl, the content that preferably comprises the compound of alkenyl is about 7 weight % of liquid-crystal composition total amount or still less.As mentioned above, can limit the content of neutral compound to increase the line afterimage demonstration time with alkenyl.
Fluorochemicals can be and is selected among the following formula I V-X one or more.
Figure A20071009205000272
Figure A20071009205000281
In above-mentioned formula, R 7-R 16Can comprise one that is selected from C1-C5 alkyl or the alkoxyl group.
The amount that neutral compound can comprise is about 20-60 weight % of liquid-crystal composition total amount, and the amount that fluorochemicals can comprise is about 40-80 weight % of liquid-crystal composition total amount.
In the embodiment of the invention described above, the LCD of arranged vertical (VA) mode has only been described.Yet those skilled in the art can easily understand, and the present invention can be used for the liquid-crystal display of horizontal orientation mode, as twisted nematic (twisted nematic) (TN) or horizontal component of electric field (IPS) indicating meter.Although described the present invention in conjunction with the actual embodiment of considering at present, but be appreciated that the present invention is not limited to these open embodiments, on the contrary, but mean be encompassed in claims spirit and scope in included various changes and equivalent arrangement.

Claims (18)

1. liquid-crystal composition comprises:
The first kind that comprises liquid crystalline cpd with at least one fluorine atom; With
Comprise second class by at least a liquid crystalline cpd of one of formula I, II and III representative,
Wherein the liquid crystalline cpd by formula I, II and III representative has end group R 1-R 6, R 1-R 6Comprise the C1-C5 alkyl separately, one of alkoxyl group and alkenyl,
In addition, wherein second class comprises first subclass and second subclass, and first subclass is included in the liquid crystalline cpd of no alkenyl on its end group, and second subclass is included in the liquid crystalline cpd that has alkenyl on its end group, and
In addition, wherein second subclass is about 7 weight % or still less of the total amount of first subclass and second subclass.
2. the liquid-crystal composition of claim 1, wherein:
The first kind is about 40-80 weight % of liquid-crystal composition total amount; With
Second class is about 20-60 weight % of liquid-crystal composition total amount.
3. the liquid-crystal composition of claim 2, wherein:
The first kind comprises at least a liquid crystalline cpd by formula IV-X representative
Figure A2007100920500002C2
Figure A2007100920500003C1
R wherein 7-R 16Comprise separately and be selected from one of C1-C5 alkyl and alkoxyl group.
4. liquid-crystal composition comprises:
The first kind that comprises liquid crystalline cpd with at least one fluorine atom; With
Comprise second class by at least a liquid crystalline cpd of one of formula I, II and III representative,
Figure A2007100920500003C2
Wherein the liquid crystalline cpd by formula I, II and III representative has end group R 1-R 6, R 1-R 6Comprise separately be selected from one of C1-C5 alkyl and alkoxyl group and
In addition, wherein second class is not included in the liquid crystalline cpd that has alkenyl on its end group.
5. the liquid-crystal composition of claim 4, wherein:
The first kind is about 40-80 weight % of liquid-crystal composition total amount; With
Second class is about 20-60 weight % of liquid-crystal composition total amount.
6. the liquid-crystal composition of claim 4, wherein
The first kind comprises at least a liquid crystalline cpd by formula IV-X representative
R wherein 7-R 16Comprise separately and be selected from one of C1-C5 alkyl and alkoxyl group.
7. liquid-crystal display comprises:
First substrate;
Second substrate in the face of first substrate;
A pair of the generating electrodes that at least one of first substrate and second substrate, forms; With
Be inserted into the liquid crystal layer between first substrate and second substrate,
Wherein liquid crystal layer comprises liquid-crystal composition, and liquid-crystal composition comprises:
Comprise the liquid crystalline cpd with at least one fluorine atom the first kind and
Comprise second class by at least a liquid crystalline cpd of one of formula I, II and III representative,
Figure A2007100920500005C2
Wherein the liquid crystalline cpd by formula I, II and III representative has end group R 1-R 6, R 1-R 6Comprise separately and be selected from the C1-C5 alkyl, in alkoxyl group and the alkenyl one, second class comprises first subclass and second subclass, first subclass is included in the liquid crystalline cpd of no alkenyl on its end group, and second subclass be included in the liquid crystalline cpd that has alkenyl on its end group and
In addition, wherein second subclass is about 7 weight % or still less of the total amount of first subclass and second subclass.
8. the liquid-crystal display of claim 7, wherein:
The first kind is about 40-80 weight % of liquid-crystal composition total amount; With
Second class is about 20-60 weight % of liquid-crystal composition total amount.
9. the liquid-crystal display of claim 7, wherein:
The first kind comprises at least a liquid crystalline cpd by formula IV-X representative
Figure A2007100920500006C1
Figure A2007100920500007C1
R wherein 7-R 16Comprise separately and be selected from one of C1-C5 alkyl and alkoxyl group.
10. the liquid-crystal display of claim 7 further comprises:
First and second signal wires that on first substrate, intersect; With
Be connected to the thin film transistor on first and second signal wires.
11. the liquid-crystal display of claim 10 further comprises:
Determine that the vergence direction of the vergence direction of liquid crystalline cpd in the liquid crystal layer determines element.
12. the liquid-crystal display of claim 11, wherein:
Vergence direction determines that element comprises the projection that forms on the otch that forms in the generating electrodes on the scene or the generating electrodes on the scene.
13. liquid-crystal display comprises:
First substrate;
Second substrate in the face of first substrate;
A pair of the generating electrodes that at least one of first substrate and second substrate, forms; With
Be inserted into the liquid crystal layer between first substrate and second substrate,
Wherein liquid crystal layer comprises liquid-crystal composition, and this liquid-crystal composition comprises:
Comprise the liquid crystalline cpd with at least one fluorine atom the first kind and
Comprise second class by the liquid crystalline cpd of one of formula I, II and III representative,
Figure A2007100920500007C2
Figure A2007100920500008C1
Wherein the liquid crystalline cpd by formula I, II and III representative has end group R 1-R 6, R 1-R 6Comprise separately being selected from the C1-C5 alkyl, in alkoxyl group and the alkenyl one and
Second subclass is not included in the liquid crystalline cpd that has alkenyl on its end group.
14. the liquid-crystal display of claim 13, wherein:
The first kind is about 40-80 weight % of liquid-crystal composition total amount; With
Second class is about 20-60 weight % of liquid-crystal composition total amount.
15. the liquid-crystal display of claim 13, wherein:
The first kind comprises at least a liquid crystalline cpd by formula IV-X representative
Figure A2007100920500008C2
R wherein 7-R 16Comprise separately and be selected from one of C1-C5 alkyl and alkoxyl group.
16. the liquid-crystal display of claim 13 further comprises:
First and second signal wires that on first substrate, intersect; With
Be connected to the thin film transistor on first and second signal wires.
17. the liquid-crystal display of claim 16 further comprises:
Determine that the vergence direction of the vergence direction of liquid crystalline cpd in the liquid crystal layer determines element.
18. the liquid-crystal display of claim 17, wherein:
Vergence direction determines that element comprises the projection that forms on the otch that forms in the generating electrodes on the scene or the generating electrodes on the scene.
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CN107573949B (en) * 2013-08-20 2020-12-22 Dic株式会社 Liquid crystal composition and liquid crystal display element using same
CN110554540A (en) * 2018-05-31 2019-12-10 捷恩智株式会社 Liquid crystal display element
CN110554540B (en) * 2018-05-31 2023-11-14 捷恩智株式会社 Liquid crystal display element

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