EP1759239A1 - Dispositif d'affichage a cristaux liquides comprenant une couche d'alignement heterogene - Google Patents
Dispositif d'affichage a cristaux liquides comprenant une couche d'alignement heterogeneInfo
- Publication number
- EP1759239A1 EP1759239A1 EP05748345A EP05748345A EP1759239A1 EP 1759239 A1 EP1759239 A1 EP 1759239A1 EP 05748345 A EP05748345 A EP 05748345A EP 05748345 A EP05748345 A EP 05748345A EP 1759239 A1 EP1759239 A1 EP 1759239A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- alignment
- liquid crystal
- display device
- layer
- crystal molecules
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Ceased
Links
Classifications
-
- 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
- G02F1/133753—Surface-induced orientation of the liquid crystal molecules, e.g. by alignment layers with different alignment orientations or pretilt angles on a same surface, e.g. for grey scale or improved viewing angle
-
- 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
- G02F1/1391—Bistable or multi-stable liquid crystal cells
-
- 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
- G02F1/133738—Surface-induced orientation of the liquid crystal molecules, e.g. by alignment layers for homogeneous alignment
-
- 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
Definitions
- the present invention relates to a liquid crystal display device of the type comprising a first front substrate and a second rear substrate separated by a space delimiting a volume for the confinement of a liquid crystal layer, a heterogeneous alignment layer being provided. on at least one of the two substrates.
- All liquid crystal applications are based on the simple principle that liquid crystals can be easily aligned by proper treatment of the contact surfaces. Better control of the alignment of liquid crystals is therefore one of the key aspects for new generations of flat panel displays. Uniform chemical surface treatments are often used to induce homeotropic alignment of liquid crystal molecules in line with the substrates of a liquid crystal display cell. It is also possible, through chemical interactions, to obtain a planar alignment of the liquid crystal molecules.
- the alignment thus obtained is not univocal or unidirectional but degenerate, that is to say that all the orientations of the liquid crystal molecules in the plane are possible.
- Such an alignment is called “inhomogeneous planar alignment”.
- the alignment layers are subjected to mechanical friction to induce a preferential orientation of the liquid crystal molecules.
- This preferential orientation is often called "easy axis” (or “easy axis” in English terminology) of liquid crystal molecules.
- the liquid crystal molecules therefore line up parallel to the easy axis.
- the mechanical friction of the alignment layers also usually makes it possible to control the polar orientation, in other words the tilt angle, of these molecules.
- the object of the present invention is to provide a liquid crystal display cell comprising a heterogeneous alignment layer of the liquid crystal molecules enabling the abovementioned drawbacks of the alignment layers of the prior art to be obviated.
- the subject of the present invention is a liquid crystal display device comprising a first front substrate and a second rear substrate separated by a space delimiting a volume for the confinement of a layer of liquid crystal molecules, these substrates comprising on their internal faces opposite a first and a second group of electrodes respectively, the application of an appropriate control voltage to selected electrodes making it possible to locally modify the optical properties of the liquid crystal, this display device comprising in in addition to a heterogeneous alignment layer provided on the inner face of at least one of the two substrates, this alignment layer comprising a film which induces either a planar alignment or a homeotropic alignment of the liquid crystal molecules and on which is structured a periodic network of elementary patterns which induce a homeotropic alignment of the moles liquid crystal cules if the film induces a
- the present invention provides a liquid crystal display device comprising a heterogeneous alignment layer formed on the inner face of at least one of the two substrates and making it possible to simultaneously control the polar orientation and the azimuthal orientation of liquid crystal molecules.
- the alignment of the liquid crystal molecules thus obtained is a unique or unidirectional alignment, which means that the polar orientation and the azimuthal orientation of the liquid crystal molecules are the same throughout the volume of the cell.
- a liquid crystal display device according to the invention has a homogeneous optical appearance, devoid of differently oriented domains which usually constitute as many display defects visible to the naked eye between crossed polarizers.
- the present invention makes it possible to produce bistable display cells in which the liquid crystal molecules can be switched between two determined positions.
- the invention can also be applied to the production of hybrid cells or "Super Twist Nematic" (STN) cells with a high tilt and twist angle which have the advantage of having a high switching speed and being able to be more easily multiplexed.
- STN Super Twist Nematic
- liquid crystals with negative dielectric anisotropy can be used.
- the resulting cells have a high switching speed, good viewing angle and excellent contrast.
- the tilt angle of the liquid crystal molecules depends on the ratio between the surfaces of the domains which induce planar alignment and the domains which induce homeotropic alignment.
- the present invention also relates to a method for manufacturing a liquid crystal display device comprising the steps consisting in: - providing a first front substrate and a second rear substrate separated by a space delimiting a confinement volume in which a layer of liquid crystal is introduced; structuring on the interior faces opposite the first and second substrates a first and a second group of electrodes respectively; - deposit on the inner face of at least one of the two substrates a heterogeneous alignment layer comprising a film which induces either a planar alignment or a homeotropic alignment of the liquid crystal molecules, and - structure on the film a periodic network of elementary patterns which induce a homeotropic alignment of the liquid crystal molecules if the film induces a planar alignment of these molecules or a planar alignment if the film induces a homeotropic alignment, the manufacturing process further comprising the steps of: - structuring the elementary patterns in a first direction with a pitch greater than or equal to the pitch with which these same elementary patterns are repeated in a second direction not parallel to the first direction;
- the polar orientation of the liquid crystal molecules is adjusted by modulating the density of coverage, that is to say the ratio between the quantity of material inducing a deposited homeotropic alignment and the maximum amount of material inducing a homeotropic alignment that can be deposited per unit area.
- the polar orientation of the liquid crystal molecules is adjusted by modulating the surface ratio between the domains which induce a homeotropic alignment and the domains which induce a planar alignment.
- the structuring of the heterogeneous alignment layer comprises the steps consisting in: - provide a buffer with a relief structure whose image corresponds to that of the desired network; - successively depositing on the substrate a layer of a material inducing a planar alignment of the liquid crystal molecules, then a layer of a material in which the image of the relief structure can be transferred; - imprinting the layer of thermoplastic material by means of the buffer to transfer the image of the relief structure into said layer of material; - unmolding the pad so that the layer of material has a succession of trenches; - remove by ion attack the remainder of the thermoplastic material which remains in the bottom of the trenches; - deposit in the gas phase or from a solution a layer of material inducing a homeotropic alignment, and - remove by removal or by dissolution the residual thermoplastic material.
- FIG. 1 is a schematic representation of a liquid crystal molecule on which are represented the polar and azimuthal orientations as well as the tilt angle of the molecule;
- - Figure 2 is a schematic sectional representation of a liquid crystal display cell according to the invention;
- - Figure 3 is a plan view of a heterogeneous alignment layer comprising first and second zones which periodically alternate and which respectively induce planar alignment and homeotropic alignment of the liquid crystal molecules;
- - Figures 4A to 4E are schematic views illustrating the different stages of the manufacturing process of the heterogeneous alignment layer shown in Figure 3;
- FIG. 1 is a schematic representation of a liquid crystal molecule on which are represented the polar and azimuthal orientations as well as the tilt angle of the molecule;
- - Figure 2 is a schematic sectional representation of a liquid crystal display cell according to the invention;
- - Figure 3 is a plan view of a heterogeneous alignment layer comprising first and second zones which periodically alternate and which respectively induce planar alignment and homeotropic alignment
- FIG. 5 is a curve representing the variation of the polar orientation or tilt angle of the liquid crystal molecules as a function of the density of coverage of the material inducing a homeotropic alignment
- - Figures 6A and 6B are perspective views of an elementary domain inducing a planar alignment of the liquid crystal molecules and having areas in relief
- - Figure 7 is a graph which shows the variations of the gradients of the widths of the domains of Figure 3 as a function of x
- FIG. 8A is a partial plan view of a heterogeneous alignment layer comprising domains which respectively induce planar and homeotropic alignments of the liquid crystal molecules and which are repeated periodically with the same pitch in the directions x, y;
- FIG. 8B is a graph which shows the variations of the gradients of the widths of the domains of FIG. 8A as a function of z;
- - Figure 9A is a partial plan view of a heterogeneous alignment layer according to the invention comprising yet another form of domains, and
- - Figure 9B is a graph which shows the variations of the gradients of the widths of the domains of the Figure 9A as a function of x.
- the present invention proceeds from the general inventive idea which consists in providing at least one of the opposite faces of two substrates of a liquid crystal display cell with a so-called heterogeneous alignment layer, that is to say that is to say formed by a periodic alternation of first and second domains which respectively induce a planar alignment and a homeotropic alignment of the liquid crystal molecules.
- a so-called heterogeneous alignment layer that is to say that is to say formed by a periodic alternation of first and second domains which respectively induce a planar alignment and a homeotropic alignment of the liquid crystal molecules.
- Figure 1 is a schematic representation of a liquid crystal molecule 1 which is in a generally cylindrical shape and whose position in space is determined relative to a three-dimensional orthogonal coordinate system x, y, z.
- FIG. 1 is a sectional view of part of a liquid crystal display cell according to the invention. Designated as a whole by the general reference numeral 2, this cell comprises a first front substrate 4 and a second rear substrate 6 separated by an interval 8 delimiting a volume for the confinement of a layer 10 of liquid crystals.
- the substrates 4 and 6 have on their opposite faces a first and a second group of electrodes, respectively 12 and 14, arranged so that the application of an appropriate control voltage to selected electrodes makes it possible to locally modify the properties. liquid crystal optics.
- the display cell 2 according to the invention further comprises a heterogeneous alignment layer 16 formed on the inner face of at least one of the substrates 4 and 6 and described in detail below.
- the display cell 2 also comprises other elements necessary for its operation such as, in particular, polarizers, retarding films, reflectors and the like but which will not be described here insofar as they play no role in the part of the present invention and that they are well known to those skilled in the art. As can be seen on examining FIG.
- the alignment layer 16 is an alignment layer of the heterogeneous type comprising a plurality of first and second domains 18 and 20 which alternate periodically and which induce, respectively, planar alignment and homeotropic alignment of liquid crystal molecules. It will be recalled for all practical purposes that the liquid crystal molecules are arranged in a planar alignment when they extend substantially parallel to the substrates of a cell, and that their arrangement is said to be homeotropic when the molecules extend substantially perpendicular to the plane cell substrates.
- the domains 20 which induce a homeotropic alignment of the liquid crystal molecules all have the same shapes and dimensions, in this case isosceles triangles, and are repeated with a step Pi in a first rectilinear direction x which is greater than the step P2 with which these same domains 20 repeat in a second rectilinear direction y perpendicular to the direction x.
- the step P-) is equal to 286 nm, while the step P2 is of the order of 190 nm.
- the step Pi with which the elementary patterns 20 which induce a homeotropic alignment of the liquid crystal molecules are repeated must be substantially less than the space 8 separating the two substrates 4 and 6 from cell 2, the values commonly observed are between 4 and 9 ⁇ m. This is why the preferred maximum value of the step Pi will be less than 1 ⁇ m and, more preferably still, less than 0.5 ⁇ m.
- the area of the domains 20 decreases according to the x direction, this in order to fix the azimuthal orientation of the liquid crystal molecules.
- L- the width of the domains 18 and L 2 the width of the domains 20.
- the direction of variation or gradient ⁇ Li / ⁇ x of the width L1 as a function of x is constant and positive as shown in FIG. 7.
- the gradient ⁇ L2 ⁇ x of the width L 2 is constant and negative, which is easily understood insofar as the domains 20 are the complements of the domains 18.
- the polar orientation or tilt angle molecules of liquid crystal it is fixed by the ratio of the areas of domains 18 and 20 as will be described in more detail below. It will of course be understood that the example of a heterogeneous alignment layer illustrated in conjunction with FIG. 3 is given purely by way of illustration and without limitation only. In particular, it is not necessary for the domains 20 to be arranged one after the other in a matrix arrangement.
- FIG. 4A illustrates the step of hot stamping.
- the substrate 6, for example made of glass, is covered with a thin electrically conductive layer, for example made of indium tin oxide (ITO) at the places where the electrodes are located 14.
- ITO indium tin oxide
- the entire surface of the substrate 6 is then covered with 'a film 22 of a material inducing a planar alignment of liquid crystal molecules such as silicon oxide, Zr ⁇ 2, I ⁇ I 2 O3, CaF2, a polyimide, a polyamide-imide, a polyphenylene or a polyamide.
- the thickness of the film 22 is typically between 10 and 100 nm.
- the film 22 should be as thin as possible at the places where it covers the ITO film so as not to cause a decrease in the electric field used for driving the liquid crystal molecules at the point of intersection of two given electrodes.
- the film 22 is then covered with a layer 24 of a thermoplastic material such as PMMA (polymethyl methacrylate) whose molecular weight is 25 kg / mole.
- thermoplastic materials used in the field of hot stamping such as polyacrylates, polycarbonates, polyamides or others, can be used. It is then provided with a buffer 26 having a relief structure 28 whose image corresponds to the arrangement of the areas 18 and 20 sought.
- the buffer 26 is obtained by replicating a master mask produced by writing using an electron beam (resolution of the order of 10 nm) or by laser interference (resolution from 250 nm depending on the length of the laser beam used).
- the pad 26 is applied hot and under pressure against the layer 24 of thermoplastic material so as to transfer the image of the relief structure into said layer of material 24.
- FIG. 4B represents the step of demolding the pad 26 so that the layer of thermoplastic material 24 has a succession of trenches 30 delimited by knolls 32.
- FIG. 4C the residue of thermoplastic material remaining in the bottom of the trenches 30 is removed by ionic attack so as to cause day the underlying film 22 of material inducing a planar alignment. The attack can be done in such a way as to create symmetrical or asymmetrical structures.
- FIG. 4D a layer 34 of material is induced in the vapor phase inducing a homeotropic alignment of the liquid crystal molecules.
- the material chosen is a fluorinated silane ((tridecafluoro-1, 1,2,2-tetrahydrooctyl) trichlorosilane).
- the film 22 of material inducing a planar alignment serves as a bonding layer to the fluorinated silane.
- the thickness of the layer 34 of fluorinated silane is of the order of 1 to 3 nm, which corresponds substantially to the average length of the silane molecules.
- silanes with a long chain of fluorinated or non-fluorinated alkyls silanes having different functionalities (mono, bi or trifunctional) or mixtures of these two types of materials can also be used.
- a process implemented at ambient temperature or at relatively low temperature and at a pressure of the order of one bar consists in depositing on the film 22 a photopolymerizable or thermosetting product in the more or less liquid state. to which the stamp is applied to transfer the desired image.
- the polymerization is carried out by means of adequate actinic radiation such as visible light, ultraviolet rays, X-rays, a electron beam or by simple heating during the application of the tampon.
- the structures are thus transferred to the film 22, the rest of the process being similar to that described above.
- photopolymerizable material there may be used acrylates, methacrylates, vinyls, thioenols, unsaturated esters and other products still known to those skilled in the art.
- thermosetting material epoxides, polyurethanes or other thermosetting materials known to those skilled in the art can be used.
- a copy of the master can be used, either in a metallic material such as nickel (the copy is better known by its Anglo-Saxon name “nickel shim”), or in a non-metallic material such as thermosetting polymers, thermoplastics or elastomers.
- the polar orientation or tilt angle of the liquid crystal molecules is influenced by the ratio between the surface of the domains which induce a planar alignment and the surface of the domains which induce a homeotropic alignment.
- the tilt angle is also influenced by the density of coverage of the material inducing a homeotropic alignment, in other words by the ratio between the quantity of material inducing a homeotropic alignment deposited and the maximum quantity of this material which it is possible to deposit by unit of area.
- FIG. 5 shows the variations in degrees of the tilt angle as a function of the percentage value of the density of coverage of the material inducing a homeotropic alignment (fluorinated silane). The curve illustrated in FIG. 5 has been established for a surface ratio between the domains which induce a planar alignment and those which induce a homeotropic alignment equal to 1.
- the present invention is not limited to the mode of embodiment which has just been described and that various simple modifications and variants can be envisaged by those skilled in the art without departing from the scope of the invention as defined by the appended claims.
- the domains which induce a planar alignment of the liquid crystal molecules have raised areas having a determined topography as illustrated in FIGS. 6A and 6B.
- Such a network better known by its Anglo-Saxon name of "grating”, can be symmetrical (FIG. 6A) or asymmetrical (FIG. 6B).
- the periodic profile 36 of the relief structure 38 has a longitudinal symmetry along the axis ll between the passage through two successive maxima or two minima.
- An asymmetrical network is, for its part, a periodic network 40 devoid of axis of symmetry.
- the periodic profile 36, 40 of the relief structures 38, 42 extends in one direction.
- FIG. 8A is a partial plan view of a heterogeneous alignment layer comprising domains 18 ′ and 20 ′ which induce planar alignment and homeotropic alignment of the liquid crystal molecules, respectively.
- the pitch P'i with which the patterns 20 'repeat in the direction x is equal to the pitch P'2 with which these same patterns 20' repeat in the direction y perpendicular to the direction x.
- the surface of said patterns 20 ′ decreases with a periodicity P 3 in a third direction z which forms an angle of 45 ° with the direction x.
- L'1 the width of the domains 18 'and L'2 the width of the domains 20'.
- the gradient ⁇ L'-j / ⁇ z of the width L'i as a function of z is constant and positive as shown in Figure 8B.
- FIG. 9A is a partial plan view of a heterogeneous alignment layer according to the invention comprising yet another form of domains.
- the surface of the 20 "domains which induce a homeotropic alignment of the liquid crystal molecules generally increases in the direction x but that it presents a succession of maxima and minima, each maximum ( respectively minimum) being closer to the x axis than the previous maximum (respectively minimum).
Abstract
Description
Claims
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP05748345A EP1759239A1 (fr) | 2004-06-15 | 2005-06-01 | Dispositif d'affichage a cristaux liquides comprenant une couche d'alignement heterogene |
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP04013933A EP1607790A1 (fr) | 2004-06-15 | 2004-06-15 | Dispositif d'affichage à cristaux liquides comprenant une couche d'alignement hétérogène |
EP05748345A EP1759239A1 (fr) | 2004-06-15 | 2005-06-01 | Dispositif d'affichage a cristaux liquides comprenant une couche d'alignement heterogene |
PCT/EP2005/005867 WO2005124443A1 (fr) | 2004-06-15 | 2005-06-01 | Dispositif d’affichage a cristaux liquides comprenant une couche d’alignement heterogene |
Publications (1)
Publication Number | Publication Date |
---|---|
EP1759239A1 true EP1759239A1 (fr) | 2007-03-07 |
Family
ID=34925356
Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP04013933A Withdrawn EP1607790A1 (fr) | 2004-06-15 | 2004-06-15 | Dispositif d'affichage à cristaux liquides comprenant une couche d'alignement hétérogène |
EP05748345A Ceased EP1759239A1 (fr) | 2004-06-15 | 2005-06-01 | Dispositif d'affichage a cristaux liquides comprenant une couche d'alignement heterogene |
Family Applications Before (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP04013933A Withdrawn EP1607790A1 (fr) | 2004-06-15 | 2004-06-15 | Dispositif d'affichage à cristaux liquides comprenant une couche d'alignement hétérogène |
Country Status (2)
Country | Link |
---|---|
EP (2) | EP1607790A1 (fr) |
WO (1) | WO2005124443A1 (fr) |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3234074A1 (de) * | 1982-09-14 | 1984-03-15 | Siemens AG, 1000 Berlin und 8000 München | Fluessigkristallzelle und ihre verwendung |
JPH0650368B2 (ja) * | 1986-07-07 | 1994-06-29 | キヤノン株式会社 | 液晶素子 |
US4878742A (en) * | 1986-08-04 | 1989-11-07 | Canon Kabushiki Kaisha | Liquid crystal optical modulator |
KR0148669B1 (ko) * | 1994-06-24 | 1998-11-16 | 가다오까 마사다까 | 액정소자, 그의 제조방법, 액정소자배향막의 형성방법, 액정소자배향막형성용 전사형, 그의 제조방법 및 배향막에 대한 요철모양의 전사장치 |
GB9502635D0 (en) * | 1995-02-10 | 1995-03-29 | Secr Defence | Liquid crystal device alignment |
-
2004
- 2004-06-15 EP EP04013933A patent/EP1607790A1/fr not_active Withdrawn
-
2005
- 2005-06-01 WO PCT/EP2005/005867 patent/WO2005124443A1/fr not_active Application Discontinuation
- 2005-06-01 EP EP05748345A patent/EP1759239A1/fr not_active Ceased
Non-Patent Citations (1)
Title |
---|
See references of WO2005124443A1 * |
Also Published As
Publication number | Publication date |
---|---|
WO2005124443A1 (fr) | 2005-12-29 |
EP1607790A1 (fr) | 2005-12-21 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
FR2743155A1 (fr) | Procede de fabrication d'un dispositif d'affichage a cristaux liquides a l'aide d'un rayonnement lumineux | |
FR2755518A1 (fr) | Procede de fabrication d'un afficheur a cristal liquide | |
EP0202974B1 (fr) | Ecran matriciel à couleurs, sa fabrication et dispositif comprenant un tel écran | |
FR2764087A1 (fr) | Dispositif d'affichage a cristal liquide | |
FR2764085A1 (fr) | Procede de production de deux domaines au sein d'une couche de cristal liquide, et dispositif d'affichage a cristal liquide et son procede de fabrication | |
EP2366125B1 (fr) | Element optique a puissance variable | |
FR2773225A1 (fr) | Dispositif d'affichage a cristal liquide et son procede de fabrication | |
FR2862141A1 (fr) | Panneau d'affichage a cristaux liquides et son procede de fabrication | |
FR2801408A1 (fr) | Dispositif d'affichage a cristal liquide multi-domaines | |
FR2623649A1 (fr) | Cellule d'affichage a cristal liquide | |
EP2576229B1 (fr) | Fabrication de structures en relief par procédés d'impression | |
FR2569280A1 (fr) | Cellule a cristal liquide | |
FR2885233A1 (fr) | Panneau d'affichage a cristaux liquides et son procede de fabrication | |
EP1430357B1 (fr) | Dispositif d'affichage bistable a cristal liquide nematique a masque optique perfectionne | |
EP0217844B1 (fr) | Procede de fabrication d'un ecran d'affichage a cristaux liquides et a reseau de diodes | |
WO2005124443A1 (fr) | Dispositif d’affichage a cristaux liquides comprenant une couche d’alignement heterogene | |
FR2733253A1 (fr) | Dispositif pour deposer un materiau par evaporation sur des substrats de grande surface | |
FR2887345A1 (fr) | Dispositif d'affichage a cristaux liquides et son procede de fabrication | |
FR2803940A1 (fr) | Dispositif d'affichage a cristaux liquides multi-domaines | |
EP0731374B1 (fr) | Ecran à cristaux liquides à angle de vue amélioré | |
EP0964287B1 (fr) | Dispositif d'affichage électro-optique à cristaux liquides et procédé de fabrication d'un tel dispositif | |
CH619052A5 (fr) | ||
EP3213146B1 (fr) | Cellule reflechissante a reflectivite modulable | |
FR2744535A1 (fr) | Procede de fabrication d'une cellule a cristaux liquides | |
FR2679048A1 (fr) | Modulateur electrooptique. |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
17P | Request for examination filed |
Effective date: 20070115 |
|
AK | Designated contracting states |
Kind code of ref document: A1 Designated state(s): AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LI LT LU MC NL PL PT RO SE SI SK TR |
|
17Q | First examination report despatched |
Effective date: 20070320 |
|
RIN1 | Information on inventor provided before grant (corrected) |
Inventor name: BASTURK, NACI Inventor name: PADESTE, CELESTINO Inventor name: GRUPP, JOACHIM Inventor name: PARK, SUNGGOOK Inventor name: SCHARF, TORALF Inventor name: SCHIFT, HELMUT |
|
DAX | Request for extension of the european patent (deleted) | ||
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE APPLICATION HAS BEEN REFUSED |
|
18R | Application refused |
Effective date: 20080906 |