CN204178683U - Smectic A liq-uid crystalline component driving circuit and liquid crystal device - Google Patents

Smectic A liq-uid crystalline component driving circuit and liquid crystal device Download PDF

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Publication number
CN204178683U
CN204178683U CN201290000815.4U CN201290000815U CN204178683U CN 204178683 U CN204178683 U CN 204178683U CN 201290000815 U CN201290000815 U CN 201290000815U CN 204178683 U CN204178683 U CN 204178683U
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China
Prior art keywords
driving circuit
controllable device
liquid crystal
smectic
panel
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CN201290000815.4U
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Chinese (zh)
Inventor
约翰·R·摩尔
J·P·汉宁顿
特里·科拉普
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Cambridge Enterprise Ltd
Dow Silicones Corp
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Cambridge Enterprise Ltd
Dow Corning Corp
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    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
    • G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
    • G09G3/3611—Control of matrices with row and column drivers
    • G09G3/3622—Control of matrices with row and column drivers using a passive matrix
    • G09G3/3629—Control of matrices with row and column drivers using a passive matrix using liquid crystals having memory effects, e.g. ferroelectric liquid crystals
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
    • G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
    • G09G3/3611—Control of matrices with row and column drivers
    • G09G3/3674—Details of drivers for scan electrodes
    • G09G3/3681—Details of drivers for scan electrodes suitable for passive matrices only
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
    • G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
    • G09G3/3611—Control of matrices with row and column drivers
    • G09G3/3685—Details of drivers for data electrodes
    • G09G3/3692—Details of drivers for data electrodes suitable for passive matrices only
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
    • G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
    • G09G3/3611—Control of matrices with row and column drivers
    • G09G3/3696—Generation of voltages supplied to electrode drivers

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Liquid Crystal Substances (AREA)
  • Liquid Crystal (AREA)

Abstract

A kind of smectic A liq-uid crystalline component driving circuit and liquid crystal device, wherein smectic A liq-uid crystalline component driving circuit has positive power source terminal, negative power end, earth terminal, control inputs and the output terminal for being connected to the liquid crystal device combining the composition with smectic A character.This circuit having the first controllable device for positive power source terminal being coupled to output terminal, being used for negative power end to be coupled to the second controllable device of output terminal and being used for earth terminal to be coupled to the 3rd controllable device of output terminal, and the first controllable device, the second controllable device and the 3rd controllable device are controllable according to control inputs.

Description

Smectic A liq-uid crystalline component driving circuit and liquid crystal device
Technical field
The present invention relates to photonics.Embodiment relates to the driving circuit of the optical device for using the material with smectic A liq-uid crystalline characteristic.In one non-limiting embodiment, optical device is display.In another non-limiting embodiment, optical device is the panel of the transmission for realizing light.In a still further non-limiting embodiment, optical device is amplitude type spatial light modulator.
Embodiment relates to optical device, wherein produces disordered state by SmA dynamic scattering process and causes transparent homogeneous state by dielectric reorientation.Such optical device may be used for the Transmission light of the amount providing change-partly, as in " pixel " or throughout whole device without the need to using polarizer.
Embodiment
With reference to figure 1 and Fig. 2, the embodiment of display panel 400 has first substrate 410 and second substrate 420.In this embodiment, two substrates are all transparent to visible ray and are made up of glass, are thus rigidity substantially.In other embodiments, the transparency and rigidity may not be needed, and some embodiment uses the substrate of the polymkeric substance such as PET of relative flexibility.
Panel 400 has first group of electrode 430, be shown as horizontal expansion in FIG and cross over device 400, and conveniently, these electrodes is called as column electrode in this article.Panel 400 has the second group of electrode 440 extended perpendicular to column electrode 430, and conveniently, these electrodes are called as row electrode in this article.Certainly, will be understood that, device 400 does not need to be directed according to shown.In this embodiment, electrode 430,440 pairs of visible rays are transparent.The example of suitable material is gold or ITO.
Row electrode 440 is disposed on the inside surface of first substrate 410, and column electrode is disposed on the inside surface of second substrate 420.Substrate is maintained the relation at interval by sept 450, and sept 450 is shown as spherical herein.Spacing between substrate defines room, and room holds smectic A composition 460.As previously discussed, liquid-crystal composition is thermotropic liquid crystal composition, present the smectic type A phase be made up of multilayer, wherein be subject to the impact of the not same electric field be applied between electrode, the aligning of each layer of composition can become more orderly or more unordered, composition has stable state, under this stable state, the aligning of each layer of composition is sorted in a different manner, include order, disordered state and intermediate state, composition makes once be switched to stationary state by electric field, and so when electric field is removed, composition just maintains this state substantially.
Aligning layer is not set in this embodiment.But, in other embodiments, aligning layer can be set.
In use, the liquid-crystal composition between the related electrode of the voltage influence between column electrode and row electrode is applied to.Such as, refer again to Fig. 1, it will be appreciated that, exemplary column electrode is marked as 430a and exemplary row electrode is marked as 440a.If low frequency, be less than 200Hz-is suitable for the amplitude of liquid-crystal composition thickness voltage as 50Hz, 60Hz-have, so directly relevant to the electrode crossing material of composition will become and to disperse and by the transmission of block visible light.If relatively high frequency, exceed about 1000Hz-such as 2KHz-voltage and be applied in, so this will make composition clear in that position and light will in that position transmitted through composition.Make the regions scatter of composition or the clear required time depends on thickness, the voltage applied and frequency respectively.
With reference to figure 3, show panel 500.This panel is similar to the panel shown in Fig. 1 and 2 substantially, except electrode 530,540 is across whole substrate 510,520 continuous print substantially.In this embodiment, substrate 510,520 pairs of visible rays are transparent.Different from the first embodiment, substrate is polymeric material.
With reference to figure 4, the driving circuit 200 of liquid crystal device has positive power rail 210, negative supply guide rail 220, grounding guide 230 and output node 250.It is by three parts, and namely logical block 160, control assembly 165 and power component 170 form.Driving circuit 200 by power circuit power-see Fig. 5.Significantly, logical block and control assembly are by logic level Power supply (selecting 5 volts herein), and circuit is configured to make this constant level power supply guarantee the part of enough power transmissions to power component.Device is in fact capacitive usually; But during scattering process also have gas current supply and this or sizable.Driver must this during ion transport with the skew of low frequency waveform for should gas current.Especially when the size of driver is large, it can form relatively large electric current when being initially supplied forward or negative sense power, and these needs are taken into account.Such as, when not having enough powers supply to power component 170, the underdrive power device in power component may make output level depart from voltage on corresponding power rail.
Comprise in the panel of the composition with smectic A liq-uid crystalline character in driving, importantly provide DC to balance.The present embodiment provides square wave to drive and balancing waveform.DC balance can by maintaining at zero cross point start and stop waveform and the circulation that comprises integer time.
It should be understood, of course, that such as contemplating the accounting for of the square wave contrary with square wave-empty controls.In also other are arranged, other waveforms such as sine wave drive can be used.
Importantly, when addressing electrode, non-selected electrode should ground connection really.
But, the non-selected row of ground connection means that all pixels in those row will experience the column voltage of pixel selection waveform or the non-selected waveform of pixel (in this case, both have the amplitude deviation of+50 volts--50 volts), this is called as " error voltage " in this area.Some composition discussed in this instructions has high error voltage tolerance-namely, and pixel will be stood high error voltage and not affect by it.The ability standing high error voltage means " 1/3rd select (one-third select) ", and scheme can be used successfully.But other drive arrangement can use together with those compositions, such as, wherein compared to for make by the pixel selected clearly voltage 1/3rd voltage, lower voltage or higher voltage are employed to stride across those of non-selected row.
The reason of non-selected row (or respectively, arranging) ground connection is made to be can not produce in non-selected electrode such as from the voltage of contiguous row/column electrode capacitance coupling.Such voltage, if they produce really, can exceed the threshold voltage of composition and affect unaltered pixel thus.When not applying waveform, good practice makes all row and column ground connection to improve the life-span.For display or any waveform generator of large panel of not being pixelated of pixelation, positive voltage alternately and negative voltage must be able to be driven across liquid crystal cell, and both sides can also be clamped to identical voltage, but not necessarily ground connection (0 volt) in this embodiment.Drive end after integer time waveform cycle, and generator ground connection when not driving demand.
Power component 170 has a p channel power MOSFET310, and one end of its main conduction path (source electrode) is connected to positive guide rail 210, and the other end of its main conduction path (drain electrode) is connected to output node 250 via the first resistor 311.One n channel power MOSFET320 makes one end of its main conduction path (source electrode) be connected to negative guide rail 220, and the other end of its main conduction path (drain electrode) is connected to output node 250 via the second resistor 321.Two-way n-channel power MOSFET makes one end of their main electrical current path (drain electrode) be connected to grounding guide 230 to 380,381 and the other end (other drain electrodes) is connected to output node 250 via the 3rd resistor 322.Two-way to being provided as pair of transistor, if they by back-to-back connection insulate with negative output node voltage dc to guarantee to align-only use single transistor, the intrinsic diode in transistor arrangement will transmit plus or minus output voltage to ground connection.This right common gate is connected to common source and connects by the 4th resistor 323.
In control assembly 165, the grid of the one p-passage MOSFET310 is connected to positive guide rail via the first pullup resistor 325, and be connected to the collector of the drop-down npn bipolar transistor 341 of the first common base, its base stage is connected to logic power guide rail 260, be 5 volts of guide rails herein, and its emitter is connected to the drain electrode of a p-channel switch FET382 via the 5th resistor 324.The grid of the one p-channel switch FET382 is connected to logic power guide rail 260 via the second pullup resistor 326.The grid of the one n-channel power MOSFET320 is connected to negative guide rail 220 via pull-down-resistor 327, and is connected to the collector of common base pull-up pnp bipolar transistor 342.The grid of common base pull-up pnp bipolar transistor 342 is connected to grounding guide 230, and the emitter of common base pull-up pnp bipolar transistor 342 is connected to logic power guide rail 260 via the 3rd pullup resistor 330.The two-way public grid to 380,381 is connected to the drain electrode of p-channel switch FET383, and its source electrode is connected to positive guide rail 210 via drain resistor 328.The grid of p-channel switch FET383 is connected to positive power rail 210 via the second pullup resistor 329, and be connected to the collector of the second common base pnp pull-down transistor 343, its base stage is coupled to logic power guide rail 260, and its emitter leads to one end of the 6th resistor 330.
In logical block 160, three open collector phase inverters are controlled by the first control signal at first node (G) place and two open collector phase inverters are controlled by the second control signal at Section Point (H) place.First open collector phase inverter 361, is connected to first node (G), and its open collector output node is coupled to the grid of a p-channel switch FET382.The source electrode of the one p-channel switch FET382 is connected to the open collector of the second open collector phase inverter 362, and its input is connected to Section Point (H).Section Point (H) also controls the 3rd open collector phase inverter 363, and it exports the emitter being coupled to common base pull-up npn bipolar transistor 342.
4th open collector phase inverter 364 is controlled by first node (G), and it exports the emitter being also coupled to common base pull-up npn bipolar transistor 342.5th open collector phase inverter 365 is also controlled by first node (G), and it exports the other end being connected to the 6th resistor 330.
Therefore circuit is that complete dc is coupled, and does not comprise capacitor.All control assemblies are only with reference to logic power guide rail 260 and grounding guide 230.
In use, when first node (G) is low, the output of the first open collector phase inverter 361 and the 4th open collector phase inverter 364 is open circuits.Therefore, the grid of a p-channel switch FET382 is connected.Then, Section Point (H) uprises, and this makes the output step-down of the second open collector phase inverter 362, and a p-channel switch FET382 is conducted electricity.The emitter of the drop-down npn bipolar transistor 341 of the first common base drags down, by this transistor opens by this.The grid of the one p-channel power MOSFET310 is left behind again by this, is connected, and output node 250 is connected to positive power rail 210.Do not have because of driving current through control assembly to arrange with reference to plus or minus guide rail, circuit can for and be fabricated to by size and make the pull-down current via the 5th resistor 324 make the about 10v-of concrete voltage-in this embodiment stride across the first pullup resistor 325, make the power being supplied to a p-channel power MOSFET310 independent of the voltage on guide rail 210, as long as this voltage is higher than Low threshold (about 15 volts).
If first node (G) is low and Section Point (H) step-down, then the first pullup resistor 325 is by the grid pull-up of a p-channel power MOSFET311, is disconnected accordingly.Both 3rd open collector phase inverter 363 and the 4th open collector phase inverter 364 have open circuit output, and therefore common base pull-up npn transistor 342 is connected by the 3rd pullup resistor 330, and this Absorption Current is by pull-down-resistor 327.Because electric current is determined by means of only control assembly again, this makes the driving voltage of a n-channel power MOSFET320 independent of power rail voltage, and a n-channel power MOSFET320 is opened that negative guide rail 230 is connected to output node.
Have nothing to do with the state of Section Point (H), if first node (G) uprises, then common base pull-up npn transistor 342 is exported by the 4th open collector phase inverter 364 of ground connection and disconnects.This makes a n-channel power MOSFET321 disconnect.One p-channel switch FET382 is exported by the open collector phase inverter 361 of ground connection and disconnects, and this guarantees that again a p-channel power MOSFET310 disconnects.
5th open collector phase inverter 365 exports step-down, and this makes the second common base pnp pull-down transistor 343 connect, this makes again p-channel switch FET383 via drain resistor 328 Absorption Current, electric current to be provided to the 4th resistor 322, connect two-way to 380,381 thus, this means two-way to absorbing electric charge to ground connection from output node, have nothing to do with the polarity of output node.
Fig. 5 illustrates the exemplary power circuit 600 of the driver 200 of Fig. 4.
The present invention is not limited to the feature of described embodiment, but extends to the gamut of claims.
Background technology
Liquid crystal has and is tending towards voluntarily the in order molecule that can not solidify and thus obtain crystal attribute, even if they still flow and may filling containers.Each phase of liquid crystal is roughly the summary sequence of state, and wherein such molecular fluid can from isotropic liquid, until it is solidified as solid.Usually such molecule by with strong anisotropy for characteristic feature.The form that this anisotropy adopts can be considered to, and its Middle molecule is characteristic feature with high length breadth ratio (more much longer than wide, because of but " rod " or " bar " shape), and can have dipolar character and anisotropy polarizability.In these cases, the mean direction of molecular orientation is called as " guiding (director) ".
Nematic liquid crystal to be used in liquid crystal planer screen device and flat-panel monitor for characteristic feature usually with modal liquid crystal material.The length or the change of other structures that extend nematic phase mesomorphic make them show other phase when cooling lower than nematic phase and before curing usually, and at a lower temperature, typical feature can be " stratified fluid ".Such layered liquid crystal is called as " smectic " liquid crystal.Only will consider the material being commonly referred to " smectic A " (being abbreviated as " SmA ") liquid crystal herein.Such as, prototype " 5CB " (4 '-amyl group-4-xenyl nitrile), " 5OCB " (is the amyl group of ether linking, 4 '-(amoxy)-4-xenyl nitrile) be nematic phase, " 8CB " (4 '-octyl group-4-xenyl nitrile) and " 8OCB " (4 '-(octyloxy)-4-xenyl nitrile), eachly under the nematic phase of higher temperature, present SmA phase, in abbreviation " mCB " and " mOCB ", m represents integer and refers to 4-cyano group-4 respectively '-alkyl xenyl and 4-cyano group-4 '-positive alkoxy xenyl in alkyl or carbon number on oxyalkyl chain, such as: 8CB=4-cyano group-4 '-octyl-biphenyl base, with 8OCB=4-cyano group-4 '-octyloxy xenyl.
The molecule forming SmA phase has the characteristic being similar to and forming those molecules nematic.They are bar-shaped and usually have positive dielectric anisotropy.Introduce strong horizontal dipole and often make SmA phase unstable in order to introduce negative dielectric anisotropic and chemical instability may be caused to increase.
Smectic liquid crystal presents delayed in their conversion, makes dielectric reorientation (or smectic other upset) not relaxation after removing the electric field applied.Different from most of nematic liquid crystal structure, the SmA liquid crystal of dielectric reorientation remains on drive state, until apply other power.
By adopting the sheet material of plane, can form plate as glass to the conductive layer (being usually made up of indium tin oxide) that these sheet applications are transparent, conductive layer is connected to conductor, make it possible to apply variable field.These two sheet materials can be formed plate, as the pearl by having homogeneous diameter (usually, as 5-15 micron, this depends on the unit cell thickness of expectation) is separated.This plate, subsequently by with adhesive edge, allows one or more hole to be convenient to be filled by liquid crystal material.
Use above-mentioned structure cell, SmA liquid crystal layer can be formed by infill panel (usually under the high temperature of isotropy conversion exceeding material).Be that necessary nematic phase equipment is different from the uniform alignment of wherein structure cell, the layer do not lined up in SmA equipment discussed in this article is desired.Fill this SmA plate and by this SmA plate from room temperature thermal cycle to exceed isotropy conversion and return again time, liquid crystal will show texture (texture), and this texture is typical concerning phase.Meanwhile, do not have the nematic phase of surface in alignment can appear in well-known schlieren texture, its center line deviates from or " passing " scattered light, and due to the impact of the layer structure of SmA material, " focal conic " is formed in SmA.In refractive index, there is spatial variations sharply, it causes light scattering.The appearance of these texture is produced by the anisotropy of refractive index, and when the more polarizable axle in light orthogonal arrival mean molecule direction, it is the highest.Change in refractive index causes light scattering.When observing (under microscope) between the polarization intersected, the contrast between the region can also observing different molecular orientation.
Exchange (AC) field and be usually applied to electrical addressing SmA liquid crystal panel.In the material of no doping, the positive dielectric anisotropy of LC, by causing the rearrangement of the multiple domain of initial random alignment, aligns (perpendicular to glass surface) to make mesomorphic (mesogen) with field direction.Because the mean direction of anisotropic molecule is perpendicular to glassy layer, panel will seem clear.For most of unadulterated SmA material, this situation is only reversible only by heating structure cell to destroy SmA alignment.
If suitable ionic dopants is dissolved in SmA liquid crystal main frame, then under the impact of DC or low frequency (such as <200Hz) electric field, two kinds of normal forces attempt to make smectic A guides directed:
I) dielectric reorientation is attempted in field direction, aim at SmA guides (showing the mean direction of long molecular axis) as described above.
Ii) simultaneously, ion is attempted to aim at smectic A guides in ion finds its direction being easier to advance by the electrolytical motion of SmA.
In SmA material, this is in layer, is namely orthogonal to field direction (namely material has positive dielectric anisotropy and negative electric anisotropy).These two kinds of competitive power produce electricity-flow kinetic instability in liquid crystal fluid, and described electricity-flow kinetic instability is called as ' dynamic scattering '.In smectic A material, dynamic scattering state consumingly scattered light and the SmA structural damage that (epidemic situation comparison similar to nematic phase material) produces is kept after the electric pulse causing it to stop.Clearly, equably the state of orientation and ion transmission cause, reversibility between multiple domain scattering state depends on the different frequency domain that these techniques operate wherein.Dynamic scattering needs ion to order about passage by the field of liquid crystal fluid.Therefore, it only drives with DC or low frequency AC and produces.
Higher frequency causes dielectric reorientation (ion can not in these frequencies " movement "), thus rebuilds the consistent direction of molecule.
Therefore, the dielectric reorientation (in Clear & Transparent state) in the SmA phase of adulterating suitably (having positive dielectric anisotropy and negative conductance anisotropy) and the combination of dynamic scattering (in strong light-scattering state) can form the basis of electrical addressing display.SmA layer is driven in optical clarity state by high frequency (visible, usually >=1000Hz) and SmA layer is driven in light-scattering state by low frequency (visible, usual <200Hz).The key feature of this display is that these two kinds of optical states utilize the short electrical addressing cycle to set up and both ad infinitum lasting, or until their electrical addressings again.This is not the real relevant phenomenon in nematic liquid crystal, and this performance is the electric light instability (or more accurately multistability) allowing SmA dynamic scattering display to be matrix addressing when not having image element circuit and cause in their the extremely low power consumption in the display of the page or in smart window.
CN-101533162 and the WO2009/111919 electric control medium disclosed for controlling light comprises two plastic film layers and mixture layer is arranged between two thin layers.Mixture layer is made up of smectic liquid crystal, polymer molecule material and adjuvant.Conductive electrode layer 4 is arranged on the side of two plastic film layers, and be applied to size, the frequency of the voltage of conductive electrode layer by control and make action time liquid crystal molecule show different alignments, electric control medium for controlling light can be switched between pellucidity in fuzzy shielding state with completely, and even can switch between multiple progressive state with different grey level.Optionally, each aspect of the present invention is got rid of especially disclosed in this instructions and is arranged.
Utility model content
In one aspect, provide a kind of smectic-A liquid crystal device driving circuit, it has positive power source terminal, negative power end, earth terminal, control inputs and the output terminal for being connected to smectic-A liquid crystal device, described circuit having the first controllable device for positive power source terminal being coupled to output terminal, being used for negative power end to be coupled to the second controllable device of output terminal and being used for earth terminal to be coupled to the 3rd controllable device of output terminal, and the first controllable device, the second controllable device and the 3rd controllable device are controllable according to control inputs.
Driving circuit can also comprise the control circuit for controlling the first-the three controllable device, and described control circuit comprises logical circuit.
Driving circuit can have for (referenced to ground) the control circuit power supply from reference ground connection to the power-producing control circuit power supply node of control circuit.
Driving circuit can be dc coupling.
In the driving circuit, the first controllable device and the second controllable device can be configured to process the power supply higher than 50 volts.
First controllable device and the second controllable device can comprise respective MOSFET, and the 3rd controllable device can comprise a pair bi-directional MOS FET.
Logical circuit can comprise open-collector inverter circuit.
In yet another aspect, provide a kind of liquid crystal device, it has liquid crystal panel and the driving circuit according to arbitrary aforementioned claim, described driving circuit is connected to provides driving voltage to described panel, described driving circuit has output node, the positive voltage that described output node is configured to provide dc to balance to described panel and negative voltage and provide earthing potential to described panel, described liquid-crystal composition comprises in % by weight:
A at least one of () 25-75% altogether has the siloxane of general formula I:
Wherein
P=1 to 10, such as 1 to 3,
Q=1 to 12, such as 6 to 10,
T=0 or 1,
K=2 or 3,
A is phenyl ring or hexamethylene ring, and A can be identical or different and at para-linkage together,
R=C 1-3alkyl, such as methyl, R can be identical or different,
X=C 1-12alkyl, and
Z=F, Cl, Br, I, CN, NH 2, NO 2, NMe 2, NCS, CH 3, or OCH 3, CF 3, OCF 3, CH 2f, CHF 2, especially CN;
B at least one of () 0.001-1% altogether has the quaternary ammonium salt of general formula I I:
Wherein:
T=methyl or silicyl or siloxane group, and
V=1 to 30, if v=9 is to 19, as myristyl (v=13, T=methyl) or cetyl (v=15 and T=methyl),
R1, R2 and R3 are C 1-4alkyl, as methyl or ethyl, R1, R2 and R3 can be identical or different,
Q -oxidation-stabilized ion, especially ClO 4 -ion,
C at least one of () 20-65% altogether has the polarizable linear molecule of alkyl chain, described molecule has general formula III:
D-A’ k-Y (III)
Wherein:
D represents C 1-16straight-chain alkyl or oxyl, optionally containing one or more double bond;
K=2 or 3,
A ' is phenyl, cyclohexyl, pyrimidine, 1,3-diox or Isosorbide-5-Nitrae-two ring [2,2,2] Xin Huan, and wherein each A ' can be identical or different and at para-linkage together, the end-rings being connected to Y be optionally phenyl and
Y is positioned at group A ' kdescribed end-rings contraposition on and be selected from Z (as above about formula I definition), C 1-16straight chained alkyl, C 1-16unbranched alkoxy, OCHF 2, NMe 2, CH 3, OCOCH 3and COCH 3; And
D () be 2-20% altogether, optionally at least one of 5-15% has the side-chain liquid crystal polysiloxane of general formula I V:
Wherein:
A, b and c have the value of 0 to 100 independently of one another and make a+b+c have 3 to 200, as the mean value in the scope of 5 to 20; And a makes to have formula Y-R 2siO-[SiR 2-O] achain element be equivalent to the compound of the general formula I V of 0 to 25 mole percentages, and c makes to have formula chain-[SiHR-O] c-R 2the unit of SiO-Y is equivalent to the compound of the general formula I V of 0 to 15 mole percentages,
M=3 to 20, as 4 to 12;
T=0 or 1,
K=2 or 3,
A is phenyl ring or hexamethylene ring, and A can be identical or different and at para-linkage together,
R=C 1-3alkyl, as methyl, each R can be identical or different, and
Y=C 1-12alkyl, chromophore or rod-like liquid crystal mesogens, and each Y can be identical or different, and
Z is as defined about formula I above.
And wherein the amount of each component and character are selected as making described composition have smectic A layering, as measured by X-ray diffraction.
Liquid crystal device can be pixelation.
Described composition can being right of priority as required U.S. Patent application 61/314039, being incorporated to the composition described in PCT/US10/27328 herein by reference.
Accompanying drawing explanation
In the accompanying drawings:
Fig. 1 is the planimetric map of the first embodiment of liquid crystal panel.
Fig. 2 is the xsect of the line II-IIA along Fig. 1;
Fig. 3 is the xsect of second embodiment through liquid crystal panel similar to the xsect of Fig. 2;
Fig. 4 is the schematic diagram of the embodiment of the driving circuit of smectic A liq-uid crystalline panel; With
Fig. 5 is the schematic diagram of the power supply of the driving circuit of Fig. 4.
In the accompanying drawings, identical reference marker refers to identical parts.

Claims (9)

1. a smectic A liq-uid crystalline component driving circuit, there is positive power source terminal, negative power end, earth terminal, control inputs and the output terminal for being connected to smectic A liq-uid crystalline device, described circuit has the first controllable device for described positive power source terminal being coupled to output terminal, for described negative power end being coupled to the second controllable device of described output terminal and being used for described earth terminal to be coupled to the 3rd controllable device of described output terminal, described first controllable device, described second controllable device and described 3rd controllable device are controllable according to described control inputs.
2. driving circuit according to claim 1, also comprise the control circuit for controlling the controllable device of described first-three, described control circuit comprises logical circuit.
3. driving circuit according to claim 2, has for the control circuit power supply from reference ground connection to the power-producing control circuit power supply node of described control circuit.
4. the driving circuit according to any one of claim 1-3, wherein said driving circuit is dc coupling.
5. the driving circuit according to any one of claim 1-3, wherein said first controllable device and described second controllable device are configured to process the power supply higher than 50 volts.
6. the driving circuit according to any one of claim 1-3, wherein said first controllable device and described second controllable device comprise respective MOSFET, and described 3rd controllable device comprises a pair bi-directional MOS FET.
7. driving circuit according to claim 2, wherein said logical circuit comprises open-collector inverter circuit.
8. a liquid crystal device, there is liquid crystal panel and the driving circuit according to arbitrary aforementioned claim, described driving circuit is connected to provides driving voltage to described panel, described driving circuit has output node, the positive voltage that described output node is configured to provide dc to balance to described panel and negative voltage and provide earthing potential to described panel.
9. liquid crystal device according to claim 8, wherein said panel is pixelation.
CN201290000815.4U 2011-09-14 2012-09-06 Smectic A liq-uid crystalline component driving circuit and liquid crystal device Expired - Fee Related CN204178683U (en)

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PCT/GB2012/052187 WO2013038151A1 (en) 2011-09-14 2012-09-06 Optical device

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