CN1326560A - Vertically aligned helix-deformed liquid crystal display - Google Patents
Vertically aligned helix-deformed liquid crystal display Download PDFInfo
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- CN1326560A CN1326560A CN99813483A CN99813483A CN1326560A CN 1326560 A CN1326560 A CN 1326560A CN 99813483 A CN99813483 A CN 99813483A CN 99813483 A CN99813483 A CN 99813483A CN 1326560 A CN1326560 A CN 1326560A
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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
- G02F1/141—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 using ferroelectric liquid crystals
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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
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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
- G02F1/133742—Surface-induced orientation of the liquid crystal molecules, e.g. by alignment layers for homeotropic alignment
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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
- G02F1/141—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 using ferroelectric liquid crystals
- G02F1/1414—Deformed helix ferroelectric [DHL]
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Abstract
A vertically aligned helix-deformed ferroelectric liquid crystal display is provided which includes: the first and second glass substrates each of which has two surfaces, the first and second glass substrates facing each other; a first transparent electrode having a first potential, being formed on a first surface of the first glass substrate; a second transparent electrode having a second potential different from the first potential, being formed on the first surface of the first glass substrate; a first vertical alignment layer being formed on the first surface of the first glass substrate, on which the first and second transparent electrodes are formed; a second vertical alignment layer formed on a first surface of the second glass substrate; and a ferroelectric liquid crystal being filled between the first and second glass substrates on which the first and second vertical alignment layers are respectively formed, facing each other, the ferroelectric liquid crystal having a shorter helix pitch than the wavelength of the light, the ferroelectric liquid crystal being helix-deformed in response to an electric field applied across the first and second transparent electrodes so that its molecules rotate in a specific direction .
Description
The present invention relates to a kind of Novel LCD that adopts the ferroelectrics liquid crystal, and more particularly, relate to vertically aligned helix-deformed (vertically aligned helix-deformed) LCD, the ferroelectrics liquid crystal that wherein has the pitch (helix pitch) shorter than the wavelength of light incident thereon is by homeotropic alignment, and the rotation of molecular guide device is by applying the helix-deformed control of the intensity of the electric field on it according to the substrate that is parallel to it, thereby, owing to evenly distributed (alignment) on a large scale obtains high-contrast, realize the analog gray scale grade, and utilize the interior electrode of face to realize the broad visible characteristic.
Utilize the photoelectric traditional LCD of liquid crystal to be configured to: transparency electrode is respectively formed on two substrates, the alignment layer that is used to arrange liquid crystal is thereon coated, liquid crystal is filled between the substrate, and two polarizers are separately fixed on the outside surface of two substrates.Traditional LCD sees through by self or stops the light of incident on it, thus in its image display message.In order to see through or to stop light, voltage is applied on the LCD, so that cause liquid crystal molecule to rotate, thereby change the molecular guide device.
Simultaneously, the liquid crystal that is used for LCD is classified as dish shape (smectic) the structure liquid crystal that together exists to row shape liquid crystal and Qi Nei direction order and location order that only has the direction order in it according to its molecules align geometric configuration.The saucer-like configuration liquid crystal also can be categorized as ferroelectric and liquid crystal para-electric according to the existence of spontaneous polarization.Insensitive to the electric polarity that is applied thereto to row shape (nematic) liquid crystal owing to do not have spontaneous polarization in it.Has dielectric anisotropy to row shape liquid crystal.Using in the twisted-nematic shape LCD of row shape liquid crystal, according to dielectric anisotropy, the response speed of liquid crystal molecule from a few tens of milliseconds to the hundreds of millisecond.Thereby, be unsuitable in the high-speed applications to row shape liquid crystal.In addition, do not adopting under multidomain structure or the additional optical films situation, presenting narrower visual angle and lower contrast to row shape liquid crystal.
With opposite to row shape liquid crystal, the ferroelectrics liquid crystal is owing to the molecule rotation that the direct coupling of spontaneous polarization and the electric field that is applied thereto causes is to have very fast response speed on the order of magnitude of tens microseconds, so the ferroelectrics liquid crystal is suitable for the realization of high speed dynamic menu.Yet the ferroelectrics LCD of traditional surface-stable is worked under bistable, so it can not have the analog gray scale grade, and is difficult to realize on wide region evenly distributed.Although utilize time or space subdivision drive pattern to realize the gray shade scale performance recently, the ferroelectrics LCD of surface-stable only presents limited gray shade scale under the drive pattern of complexity.
Under the antiferroelectrics case of liquid crystal displays of introducing recently, it has than to the high response speed of row shape LCD, and has continuous gray shade scale when using the V-arrangement conversion.Yet it has the problem that is difficult to evenly distributed and image flicker in wide region.Simultaneously, proposed a kind of ferroelectrics LCD that is arranged in parallel helix-deformed, it adopts the ferroelectrics liquid crystal that has than the pitch of the remarkable weak point of incident light wavelength.In this LCD, electric field so that make the helical structure distortion in the plane of substrate, thereby is realized the Continuous Gray Scale grade across the electrode for preparing on two substrates.This display has higher response speed, but it need be used for additional alignment processes evenly distributed on wide region, as shearing (shear) or electric field treatment.In addition, can produce defect sturcture such as bar-shaped zone.
As mentioned above, traditional ferroelectrics and antiferroelectrics LCD have the difficulty of the evenly distributed and analog gray scale grade of acquisition on a large scale, and deterioration of image quality.Specifically, be difficult to obtain the arrangement of the even same sex for the ferroelectrics with short pitch and antiferroelectrics liquid crystal, especially because the bar-shaped zone that strong polar interaction is caused between liquid crystal molecule and the arrayed surface.Therefore, the profile for this same sex of ferroelectrics liquid crystal of lacking pitch has worsened contrast and light transmittance.
High-quality large-scale LCD needs fabulous angle of visibility feature, evenly distributed on a large scale, high response speed and high contrast.Liquid crystal is for having very large photoanisotropy material, so its effective refractive index alters a great deal with the angle of the light of incident on it.For present widely used twisted-nematic shape pattern, according to the variation of the contrast of visual angle change for around presenting antisymmetry with angle of rotation perpendicular to the axle vergence direction of substrate.In order to address this problem, be extensive use of a kind of optical compensation method, it adopts the phase retardation film of a single shaft or twin shaft in addition, compensates the effective refractive index of liquid crystal under given conditions.Additive method comprises the multidomain aligning method of the different directions with the liquid crystal molecule in a plurality of subpixel of single pixel, and the method that adopts the face internal conversion of molecule on same substrate.
In above-mentioned method, multidomain structure need have the multiple friction or the optical figuring of at least twice photomask, has complicated process, and this has caused arranging the deterioration of reliability and high manufacturing cost.Be used for in-plane-switching-mode to row shape LCD present lower response speed, because low slit than the lower transmissivity of (aperture ratio), and worsens picture because image keeps.Other present higher contrast ratio and visual properties preferably such as optical compensation bending mode and reverse twist nematic-mode, but they still do not have the visual properties of symmetry.
The present invention relates to vertically aligned helix-deformed ferroelectrics LCD, it has eliminated one or more basically because the limitation of correlation technique and the problem that shortcoming causes.
Purpose of the present invention is for providing a kind of vertically aligned helix-deformed ferroelectrics LCD, the ferroelectrics liquid crystal that wherein has the pitch shorter than the wavelength of light between two substrates by homeotropic alignment, and its molecule rotation direction is parallel to electrode control in the face of the electric field that substrate applies based on utilization, evenly distributed on a large scale to obtain, keeping high contrast, and analog gray scale grade and fabulous visual properties are provided.
In order to realize purpose of the present invention, a kind of vertically aligned helix-deformed ferroelectrics LCD is provided, it comprises first and second glass substrates that all have two surfaces, first and second glass substrates face with each other; Be formed at first transparency electrode on the first surface of first glass substrate with first electromotive force; Be formed at second transparency electrode on the first surface of first glass substrate with second electromotive force that is different from first electromotive force; Be formed on the first homeotropic alignment layer on the first surface of first glass substrate, form first and second transparency electrodes on it; Be formed on the second homeotropic alignment layer on the second glass substrate first surface; And be filled in ferroelectrics liquid crystal between first and second glass substrates, the first and second homeotropic alignment layers are formed at respectively on first and second substrates, face with each other, the ferroelectrics liquid crystal has the pitch shorter than light wavelength, the electric field that the ferroelectrics liquid crystal response applies across first and second transparency electrodes and by helix-deformed, so that its molecule rotates on specific direction.
For the through mode LCD, it also comprises first polarizer on the second surface that invests first glass substrate, and invests second polarizer that has the optical axis vertical with the optical axis of first polarizer on the second glass substrate second surface.
For reflection LCD, the catoptron that it also comprises on first or the second surface that is formed on second glass substrate, the compensation film with light delay characteristic of 1/4th of light wavelength is formed on the second surface of first glass substrate; And have with the optical axis at the optical axis angle at 45 of compensation film, be formed on the single polarizer on the compensation film.
It all is exemplary and indicative should understanding above general introduction and the following detailed description, the present invention for required protection is further explained being used for.
Involved further explanation of the present invention to be provided and to explain that with acting as description of the invention has illustrated embodiments of the invention in this accompanying drawing that constitutes the part of instructions.
Among the figure:
Fig. 1 illustrates the structure according to vertically aligned helix-deformed through mode LCD of the present invention;
Fig. 2 illustrates the drive principle of the LCD of Fig. 1;
Fig. 3 is illustrated in optical transmittance and puts on relation between the intensity of electric field of vertically aligned helix-deformed liquid crystal display of the present invention;
Fig. 4 shows the optical transmittance response characteristic and puts on relation between the square wave voltage waveform of vertically aligned helix-deformed liquid crystal display of the present invention;
Fig. 5 shows the example according to the arrangement of the drive electrode of vertically aligned helix-deformed liquid crystal display of the present invention;
Fig. 6 shows another example according to the arrangement of the drive electrode of vertically aligned helix-deformed liquid crystal display of the present invention;
Fig. 7 shows the structure according to vertically aligned helix-deformed reflection LCD of the present invention;
Now will be in detail with reference to the preferred embodiments of the present invention illustrated in the accompanying drawings.
The present invention utilizes basically according to the spiral that is applied to the electric field of ferroelectrics liquid crystal and untwists (helix-unwinding) phenomenon as its drive principle.In helix-deformed ferroelectrics LCD according to the present invention, to compare with traditional helix-deformed ferroelectrics LCD, the direction of the screw axis of LCD is aligned to perpendicular to substrate, and transparency electrode only is present on the substrate.Therefore, analog gray scale grade performance can be easily by realizing across the electric field that is present in the electrode in the same substrate, and because the uniform homeotropic alignment of wide region, and need not adopt additional alignment process, therefore can realize high-contrast such as friction (rubbing) process or electric field treatment.In addition, according to the inherent multidomain structure of two or four subpixel (subpixel) in each pixel, realized the visible angle feature of broad by the molecule sense of rotation, and the molecule sense of rotation depends on the polarity by the electric field that each electrode provided in the face.
Fig. 1 shows according to vertically aligned helix-deformed through mode LCD of the present invention.As shown in Figure 1, through mode LCD of the present invention has first and second indiums-Xi-oxide (ITO) transparency electrode 20 and 30 on the first surface 12 that is formed on first glass substrate 10.Two transparency electrodes alternately are formed on the substrate, shown in Fig. 5 or 6, and keep tens distances to the hundreds of micron between them, are preferably 20 microns in the present embodiment.On the first surface 12 such as coated first glass substrate 10 that is formed with first and second electrodes 20 and 30 thereon of the homeotropic alignment material of JALS-204 (Japan SYnthetic Rubber Co. Ltd), to form the first homeotropic alignment layer 40.The homeotropic alignment material of JALS-204 also is coated on the first surface 52 of second glass substrate 50 to form the second homeotropic alignment layer 60.
Two glass substrates 10 and 50 have several microns distance therebetween toward each other, are preferably 5 microns, so that the first and second homeotropic alignment layers 40 and 60 toward each other.Preferably the optical anisotropy of the liquid crystal that is produced by the distance between two substrates is less than 720nm.The surface pre-tilt angle falls within the 75 °≤θ s≤90 ° scope, and wherein θ s is the surperficial pre-tilt angle of homeotropic alignment layer with respect to substrate, is preferably 90 ° in the present embodiment.Ferroelectrics liquid crystal 70 such as FLC-10817 (Rolic company limited) is inserted between two substrates 10 and 50 and sealing then.The operating voltage that puts on liquid crystal diminishes along with the increase of spontaneous polarization strength.Has 115nC/cm
2The liquid crystal of spontaneous polarization strength is used for present embodiment.The molecule tilt angle is 34 °, and it falls within the scope of 22.5 °≤θ≤45 °.Pitch is 0.2 micron, and it is for less 0.35 micron of the visible light in short wavelength zone.
For evenly distributed, preferably there is smectic phase A, most of material of molecule tilt angle does not have smectic phase A in facies-suite and have greatly.Thereby, adopt isotropic phase (64.5 °-62.4 °)-hand to levy the phase transformation order that nematic phase (62.4 °-61.5 °)-hand is levied smectic phase (ferroelectrics phase) in an embodiment of the present invention.
For through mode, first polarizer 80 invests on the second surface 14 of first glass substrate 10, and second polarizer 90 invests on the second surface 54 of second glass substrate 50.The optical axis of first polarizer 80 be parallel to the direction of an electric field that substrate applies at 45 ± 3 ° angle.The optical axis of the optical axis of second polarizer 90 and first polarizer 80 at an angle of 90.
The drive principle of vertically aligned helix-deformed ferroelectrics LCD will be explained below.Under the central pixel situation of Fig. 1 and Fig. 2, when electric field is not applied to homeotropic texture of the present invention, keep the dish shape helical layer structure of liquid crystal, therefore average optical axis direction 71 is perpendicular to substrate.In Fig. 2, the molecule that shows on the saucer-like configuration awl at the projective structure of the molecules align of the central pixel on one of two substrates points to each direction.So light is stopped fully by orthogonal two polarizers 80 and 90.
On the other hand, when the electric field greater than threshold value is applied to LCD, according to the polarization of the electric field that is applied that directly is coupled with the spontaneous polarization strength of ferroelectrics liquid crystal, average optical axis makes direction inclination and depart from the Normal plane of substrate.As a result, incident light is by the polarizer propagation at 45 with direction of an electric field.Specifically, the liquid crystal molecule in the pixel of left side is aligned to-90 ° angle, so that average optical axis makes direction 72 is downward-sloping from vertical direction.In the projective structure of the liquid crystal molecule of the left side of Fig. 2 pixel, molecule is arranged downwards.The Liquid Crystal Molecules Alignment of right side pixel is spent at an angle of 90, so that average optical axis makes 73 is inclined upwardly from vertical direction.In Fig. 2, the molecule of right side pixel is upwards arranged.
Fig. 3 shows at optical transmittance and puts on relation between the intensity of electric field of vertically aligned helix-deformed liquid crystal display of the present invention.It shows liquid crystal molecule lasting rotation with the intensity according to the electric field that is applied on the surface of saucer-like configuration awl and makes the helical structure distortion, and the size of effective birefringence of liquid crystal changes continuously, so that change continuously across the light intensity with direction of an electric field polarizer at 45.The result has realized the analog gray scale grade.Be parallel to electric field intensity that substrate applies and have maximal value having on first glass substrate 10 of electrode, and when second glass substrate that does not have electrode is propagated, diminish first.The speed of molecule rotation is directly proportional with the intensity of electric field.
Fig. 4 shows the optical transmittance response characteristic and puts on relation between the square wave voltage waveform of vertically aligned helix-deformed liquid crystal display of the present invention.With reference to Fig. 4, by applying square wave, liquid crystal changes to ON state (light transmission state) from OFF state (light blocking state) in about 140 microseconds of the time that raises for voltage, by removing square wave, liquid crystal changes to the OFF state from the ON state in about 40 microseconds that reduce the time for voltage.As shown in Figure 3, the transmissivity under the ON state is directly proportional with the electric field intensity that is applied.
Fig. 5 shows the example according to the arrangement of the drive electrode of vertically aligned helix-deformed liquid crystal display of the present invention.First transparency electrode 20 has the shape of letter " n ", and second transparency electrode 30 has the shape of letter " m ", and two electrodes 20 and 30 are alternately arranged.Thereby, have betwixt in 1 * 4 the matrix of electrode branches and have 4 subpixel.So, the subpixel 101 of odd numbered and 103 and the subpixel 102 of even-numbered and 104 average optical axis makes comparative electrode branch have the antisymmetrization feature, this is owing to replace in pixel 100 at the electric field that puts under the ON state on four subpixel 101,102,103,104.The antisymmetry optical axis of the subpixel in a pixel brings the visible angle of broad.Therefore, according to the structure of transparency electrode, compare with traditional LCD, LCD of the present invention can guarantee the visual properties of broad easily, and the optical thin film that need not add.
Fig. 6 shows another example according to the arrangement of the drive electrode of vertically aligned helix-deformed liquid crystal display of the present invention.In this electroplax structure, second transparency electrode 30 is arranged between two first transparency electrodes 20, and alternately arranges from a plurality of branches that first electrode 30 vertically stretches out with from each branch that second electrode 30 stretches out.Thereby pixel is divided into a plurality of subpixel by electrode branches, and two adjacent subpixel have optical axis respect to one another in the horizontal direction.Four subpixel are arranged in 2 * 2 the matrix in this electroplax structure.
Fig. 7 shows according to vertically aligned helix-deformed liquid crystal display of the present invention.Compare with the through mode among Fig. 1, a catoptron 120 is fixed on the first surface 52 or second surface 54 of second glass substrate 50 in this structure, and on the second surface 54 of second glass substrate 50, do not have polarizer, and compensation film 84 is arranged between first glass substrate 10 and the polarizer 80.Components identical is by identical designated in Fig. 1 and Fig. 7.
The direction of the optical axis of compensation film 84 and polarizer 80 angles at 45.Compensation film 84 has 1/4th phase delay of lambda1-wavelength.The phase delay of preferred compensation film 84 cover from 160 * Nnm to 200 * Nnm (N=1,2,3...).For reflection-type, optical signature is because when do not have electric field to be applied to substrate, the average optical axis makes of liquid crystal is vertical with substrate by the decision of the phase delay of compensation film, and effective phase delay of light is two times of phase delay of compensation film 84, the realization dark state.When electric field was applied to reflection LCD, the average optical axis makes of liquid crystal tilted and away from the normal direction of substrate, thereby has effective birefringence.Thereby, according to having realized bright state by the phase delay apart from the product size between effective birefringence and two substrates.As mentioned above,, be easy to realize evenly distributed and analog gray scale grade performance according to the present invention, and owing to homeotropic alignment has obtained high contrast.In addition, according to the visual properties of having realized broad based on the multidomain structure of the inherence of electrode arranging structure.In addition, owing to no longer need handle such as the alignment layer of friction process, and manufacture process is simplified, and reduced manufacturing cost.
Should be understood that for those skilled in the art, do not deviating under the scope of the invention and the marrow prerequisite, can in vertically aligned helix-deformed ferroelectrics LCD of the present invention, make various modifications and improvement.Thereby if they fall in the scope of the present invention that is limited by claim and equivalent thereof, these modifications and improvement are just contained in the present invention so.
Claims (10)
1. a vertically aligned helix-deformed liquid crystal display comprises
Each all has first and second glass substrates on two surfaces, and first and second glass substrates face with each other;
First transparency electrode with first electromotive force, it is formed on the first surface of first glass substrate;
Have second transparency electrode of second electromotive force different with first electromotive force, it is formed on the first surface of first glass substrate;
Be formed on the first homeotropic alignment layer on the first surface of first glass substrate, be formed with first and second transparency electrodes on it;
Be formed on the second homeotropic alignment layer on the first surface of second glass substrate; And
Fill the ferroelectrics liquid crystal between first and second glass substrates that are formed with the first and second homeotropic alignment layers thereon respectively and face with each other, described ferroelectrics liquid crystal has the pitch shorter than light wavelength, the electric field that response applies across first and second transparency electrodes, the ferroelectrics liquid crystal is by helix-deformed, so that its molecule rotates on specific direction.
2. LCD as claimed in claim 1 is characterized in that, when the molecule inclination angle for screw axis ferroelectrics liquid crystal was θ, the molecule inclination angle fell in the scope of 22.5 °≤θ≤45 °.
3. LCD as claimed in claim 1 is characterized in that the pitch of ferroelectrics liquid crystal is less than 0.35 micron.
4. LCD as claimed in claim 1 is characterized in that, surperficial pre-tilt angle falls into 75 °≤θ s≤90 °, and wherein θ s is the surperficial pre-tilt angle of the relative substrate of homeotropic alignment layer.
5. LCD as claimed in claim 1 is characterized in that, amassing less than 720nm between the refractive index anisotropy of each substrate distance and ferroelectrics liquid crystal.
6. LCD as claimed in claim 1 is characterized in that, also comprises:
Invest first polarizer on the second surface of first glass substrate; And
Invest second polarizer that has the optical axis vertical on the second surface of second glass substrate with the first polarizer optical axis.
7. LCD as claimed in claim 6 is characterized in that, first polarizer has and is the optical axis across the direction angle at 45 of the electric field of first and second transparency electrodes.
8. LCD as claimed in claim 1 is characterized in that first and second transparency electrodes are alternately arranged, so that the optical axis of adjacent two pixels antisymmetry each other.
9. vertically aligned helix-deformed ferroelectrics LCD comprises:
Each all has first and second glass substrates on two surfaces, and described first and second glass substrates face with each other;
Be formed on first transparency electrode on the first surface of first glass substrate with first electromotive force;
Be formed on second transparency electrode on the first surface of first glass substrate with second electromotive force that is different from first electromotive force;
Be formed on the first homeotropic alignment layer on the first surface of first glass substrate, form first and second transparency electrodes on it;
Invest the catoptron on the side of second glass substrate;
Be formed on the second homeotropic alignment layer on the first surface of second glass substrate;
Be formed on the compensation film on the second surface of first glass substrate, described compensation film has the quarter-wave light delay characteristic of light;
Be formed on the polarizer on the second surface of first glass substrate, described polarizer has the optical axis with the optical axis angle at 45 of compensation film; And
Fill the ferroelectrics liquid crystal between first and second glass substrates that form the first and second homeotropic alignment layers thereon respectively and face with each other, described ferroelectrics liquid crystal has the pitch shorter than light wavelength, the electric field that response applies across first and second transparency electrodes, the ferroelectrics liquid crystal is by helix-deformed, so that its molecule rotates on specific direction.
10. LCD as claimed in claim 9 is characterized in that, the phase delay of compensation film comprise from the scope of 160 * Nnm to 200 * Nnm (N=1,2,3......).
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1019980050029A KR100320102B1 (en) | 1998-11-21 | 1998-11-21 | Vertically Aligned Helix-Deformed Liquid Crystal Display |
| KR1998/50029 | 1998-11-21 |
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| Publication Number | Publication Date |
|---|---|
| CN1326560A true CN1326560A (en) | 2001-12-12 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN99813483A Pending CN1326560A (en) | 1998-11-21 | 1999-11-20 | Vertically aligned helix-deformed liquid crystal display |
Country Status (6)
| Country | Link |
|---|---|
| EP (1) | EP1131671A1 (en) |
| JP (1) | JP2002530720A (en) |
| KR (1) | KR100320102B1 (en) |
| CN (1) | CN1326560A (en) |
| AU (1) | AU1187900A (en) |
| WO (1) | WO2000031582A1 (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7623209B2 (en) | 2005-11-03 | 2009-11-24 | Au Optronics Corp. | Liquid crystal display panel and method for manufacturing thereof and liquid crystal display incorporating the same |
| CN101156107B (en) * | 2005-02-03 | 2010-11-24 | 北卡罗来纳大学查珀尔希尔分校 | Low surface energy polymeric material for use in liquid crystal displays |
| CN102298237A (en) * | 2010-06-25 | 2011-12-28 | 乐金显示有限公司 | Liquid crystal display device |
| CN102074200B (en) * | 2003-03-31 | 2012-11-28 | 伊英克公司 | Methods for driving bistable electro-optic displays |
| WO2016116040A1 (en) * | 2015-01-20 | 2016-07-28 | The Hong Kong University Of Science And Technology | Standing helix ferroelectric liquid crystal display cell |
| TWI559059B (en) * | 2012-06-06 | 2016-11-21 | 迪愛生股份有限公司 | Liquid crystalline light modulator |
| CN108572488A (en) * | 2017-12-08 | 2018-09-25 | 北京航空航天大学 | A kind of photoswitch based on electrolysis screw type ferroelectric liquid crystals |
| CN117331260A (en) * | 2023-11-20 | 2024-01-02 | 南京邮电大学 | Method for realizing microsecond electro-optic response of low driving electric field in ferroelectric nematic liquid crystal |
Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| MXPA02004594A (en) | 1999-11-16 | 2002-10-23 | Boehringer Ingelheim Pharma | Urea derivatives as anti inflammatory agents. |
| KR100852224B1 (en) * | 2000-12-28 | 2008-08-13 | 하야시 텔렘프 가부시끼가이샤 | Retardation film and process for producing the same |
| JP4773649B2 (en) * | 2001-09-20 | 2011-09-14 | 株式会社リコー | Optical deflection apparatus and image display apparatus |
| KR20030005927A (en) * | 2001-07-11 | 2003-01-23 | 학교법인고려중앙학원 | Ferroelectric Liquid Crystal Display Device Applied by Normally White Mode |
| US7304705B2 (en) * | 2002-03-26 | 2007-12-04 | Ricoh Company, Ltd. | Imaging unit, optical write unit, optical read unit and image forming apparatus |
| GB0414882D0 (en) | 2004-07-02 | 2004-08-04 | Univ Cambridge Tech | Liquid crystal device |
| KR101667052B1 (en) * | 2010-06-15 | 2016-10-17 | 한양대학교 산학협력단 | Liquid crystal display |
| KR101495700B1 (en) * | 2011-11-18 | 2015-03-02 | 디아이씨 가부시끼가이샤 | Liquid crystal display element |
| CN109270760A (en) * | 2018-10-08 | 2019-01-25 | 新辉开科技（深圳）有限公司 | A kind of bistable liquid crystal display for air-conditioning remote control |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0032362B1 (en) * | 1980-01-10 | 1984-08-22 | Noel A. Clark | Chiral smectic liquid crystal electro-optical device and process of making the same |
| EP0309774B1 (en) * | 1987-09-18 | 1992-11-19 | F. Hoffmann-La Roche Ag | Ferroelectric liquid-crystal cell |
| EP0405346B1 (en) * | 1989-06-29 | 1995-09-20 | F. Hoffmann-La Roche Ag | Bistable ferroelectric liquid cristal display |
| US5539555A (en) * | 1990-07-20 | 1996-07-23 | Displaytech, Inc. | High contrast distorted helex effect electro-optic devices and tight ferroelectric pitch ferroelectric liquid crystal compositions useful therein |
| KR970007426A (en) * | 1995-07-20 | 1997-02-21 | 윤종용 | Ferroelectric Nematic Liquid Crystal Display |
| US6606134B1 (en) * | 1997-03-11 | 2003-08-12 | Rolic Ag | Reflective ferroelectric liquid crystal display and projection system |
-
1998
- 1998-11-21 KR KR1019980050029A patent/KR100320102B1/en not_active IP Right Cessation
-
1999
- 1999-11-20 CN CN99813483A patent/CN1326560A/en active Pending
- 1999-11-20 EP EP99972747A patent/EP1131671A1/en not_active Withdrawn
- 1999-11-20 JP JP2000584341A patent/JP2002530720A/en not_active Ceased
- 1999-11-20 AU AU11879/00A patent/AU1187900A/en not_active Abandoned
- 1999-11-20 WO PCT/KR1999/000700 patent/WO2000031582A1/en not_active Application Discontinuation
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102074200B (en) * | 2003-03-31 | 2012-11-28 | 伊英克公司 | Methods for driving bistable electro-optic displays |
| CN101156107B (en) * | 2005-02-03 | 2010-11-24 | 北卡罗来纳大学查珀尔希尔分校 | Low surface energy polymeric material for use in liquid crystal displays |
| US7623209B2 (en) | 2005-11-03 | 2009-11-24 | Au Optronics Corp. | Liquid crystal display panel and method for manufacturing thereof and liquid crystal display incorporating the same |
| US8289485B2 (en) | 2005-11-03 | 2012-10-16 | Au Optronics Corp. | Liquid crystal display panel and method for manufacturing thereof and liquid crystal display incorporating the same |
| CN102298237A (en) * | 2010-06-25 | 2011-12-28 | 乐金显示有限公司 | Liquid crystal display device |
| TWI559059B (en) * | 2012-06-06 | 2016-11-21 | 迪愛生股份有限公司 | Liquid crystalline light modulator |
| WO2016116040A1 (en) * | 2015-01-20 | 2016-07-28 | The Hong Kong University Of Science And Technology | Standing helix ferroelectric liquid crystal display cell |
| CN107209431A (en) * | 2015-01-20 | 2017-09-26 | 香港科技大学 | Vertical helical ferroelectric liquid crystals display unit |
| US10451948B2 (en) | 2015-01-20 | 2019-10-22 | The Hong Kong University Of Science And Technology | Standing helix ferroelectric liquid crystal display cell |
| CN108572488A (en) * | 2017-12-08 | 2018-09-25 | 北京航空航天大学 | A kind of photoswitch based on electrolysis screw type ferroelectric liquid crystals |
| CN108572488B (en) * | 2017-12-08 | 2021-07-06 | 北京航空航天大学 | Optical switch based on electrolytic spiral ferroelectric liquid crystal |
| CN117331260A (en) * | 2023-11-20 | 2024-01-02 | 南京邮电大学 | Method for realizing microsecond electro-optic response of low driving electric field in ferroelectric nematic liquid crystal |
Also Published As
| Publication number | Publication date |
|---|---|
| KR100320102B1 (en) | 2002-04-22 |
| EP1131671A1 (en) | 2001-09-12 |
| JP2002530720A (en) | 2002-09-17 |
| KR20000033252A (en) | 2000-06-15 |
| AU1187900A (en) | 2000-06-13 |
| WO2000031582A1 (en) | 2000-06-02 |
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