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Enhanced Backscattering and Light Transmission in A Guest Host Display
| Content Provider | The Lens |
|---|---|
| Description | L'appareil à cristaux liquides décrit (30) comprend un milieu de confinement (56), un matériau à cristaux liquides biréfringent (38) et un colorant pléochroïque (54) contenu dans le matériau à cristaux liquides. La différence entre les indices de réfraction ordinaire et extraordinaire du matériau à cristaux liquides est comprise entre environ 0,23 et 0,30. Le matériau à cristaux liquides est dispersé en plusieurs volumes dans le milieu de confinement et la grandeur de ces volumes est de l'ordre d'environ 0,5 à 2,5 microns. L'épaisseur du milieu de confinement est comprise entre 8 et 18 microns. Un colorant pléochroïque est présent dans le matériau à cristaux liquides selon une concentration comprise entre environ 0,6 et 1,2 %. Ledit appareil se caractérise par une rétrodiffusion améliorée en état hors champ et par une transmission de la lumière améliorée en état sur champ. |
| Abstract | A liquid crystal apparatus (30) comprising a containment medium (56), a birefringent liquid crystal material (38) and a pleochroic dye (54) contained in the liquid crystal material. The difference between the ordinary and extraordinary indices of refraction of the liquid crystal material is between about .23 and .30. The liquid crystal material is dispersed in plural volumes in the containment medium and the size of those volumes are on the order of about .5 to 2.5 microns. The thickness of the containment medium is between about 8 and 18 microns. A pleochroic dye is present in the liquid crystal material in a concentration of about .6 % to 1.2 %. The apparatus has enhanced backscattering in the field-off state and enhanced light transmission in the field-on state. |
| Related Links | https://www.lens.org/images/patent/WO/1990003593/A1/WO_1990_003593_A1.pdf |
| Language | English |
| Publisher Date | 1990-04-05 |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Patent |
| Date Applied | 1989-09-26 |
| Agent | Egan, William, J. |
| Applicant | Taliq Corp |
| Application No. | 8904097 |
| Claim | A liquid crystal apparatus comprising: a containment medium, a birefringent liquid crystal material wherein the difference between the ordinary and extraordinary indices of refraction of said liquid crystal material is greater than or equal to about .23, said liquid crystal material dispersed in plural volumes in said containment medium wherein said volumes have a size from about .5 to 2.5 microns, the thickness of said containment medium between about 8 and 18 microns, and a pleochroic dye contained in said liquid crystal material that conforms to the structure thereof wherein the concentration of said dye in said liquid crystal material is on the order between about .6% and 1.2%. The apparatus of Claim 1 wherein a reflector means is disposed on a non-viewing side of said containment medium. The apparatus of Claim 1 or 2 wherein the concentration of said dye is between about .8% and 2%. The apparatus of Claim 3 wherein the thickness of said containment medium is between 13 and 16 microns. The apparatus of Claim 4 wherein the difference between the ordinary and extraordinary indices of refraction is between about .23 and .30. The apparatus of Claim 5 wherein the difference between the ordinary and extraordinary indices of separation is between about .23 and .26. 7. The apparatus of Claim 5 wherein the size of said volumes is between about 1.3 and 1.8 microns. The apparatus of Claim 1 wherein said liquid crystal material and said containment medium cooperate to backscatter, absorb and transmit light incident thereon independently of the polarization of such incident light. The apparatus of Claim 8 wherein said volumes are formed in said containment medium in a three dimensional matrix. The apparatus of Claim 1 wherein said liquid crystal material is operationally nematic liquid crystal material having a positive dielectric anisotropy. The apparatus of Claim 1 further including electrode means for applying an electric field across said liquid crystal materia The apparatus of Claim 11 further including substrate means for supporting said electrode means. The apparatus of Claim 12 further including circuit means for controlling the application of said electric field. A liquid crystal apparatus, comprising: a containment medium, a birefringent liquid crystal material wherein the difference between the ordinary and extraordinary indices of refraction of said liquid crystal material is between about .23 and .30, said liquid crystal material dispersed in substantially spherical capsules in said medium wherein said capsules have a diameter of between about .5 and 2.5 microns, said medium producing a generally distorted alignment of said liquid crystal material which in response to such alignment at least one of scatters and absorbs light and which in response to an electric field reduces the amount of such scattering or absorption, electrode-coated substrate means for applying said electric field and said medium disposed therebetween and having a thickness between about 8 and 18 microns, and a pleochroic dye contained in said liquid crystal material that conforms to the structure thereof with the concentration of said dye in said liquid crystal material on the order of between about .6% and 1.2' a • The apparatus of Claim 14 further including a reflector means disposed on a non-viewing side of said medium. The apparatus of Claim 15 wherein the difference between the ordinary and extraordinary indices of refraction of said liquid crystal material is between about .23 and .26. The apparatus of Claim 14 or 15 wherein the concentration of said dye is between about .8% and The apparatus of Claim 17 wherein the thickness of said containment medium is between about 13 and 16 microns. 19. The apparatus of Claim 18 wherein the diameter of said capsules is between about 1.3 and 1.8 microns. A method of making a liquid crystal apparatus, comprising: forming a plurality of volumes of a birefringent liquid crystal material and a pleochroic dye that conforms to the structure thereof in a containment medium such that the walls of said volumes produce a distorted alignment of said liquid crystal material which in response to such alignment at least one of scatters and absorbs light and which in response to an electric field reduces the amount of such scattering or absorption wherein said volumes have a size of between about .5 and 2.5 microns, selecting said liquid crystal material such that the difference between its ordinary and extraordinary indices of refraction is greater than or equal to about .23 wherein the concentration of said pleochroic dye in said liquid crystal material is in the order of between about .6% and 1.2%, and forming said containment medium to have a thickness of between about 8 and 18 microns. A liquid crystal apparatus comprising: a containment medium, a birefringent liquid crystal material wherein the difference between the ordinary and extraordinary indices of refraction of said liquid crystal material is greater than or equal to about .23, said liquid crystal material dispersed in plural volumes in said containment medium wherein said volumes have a mean volume diameter from about .5 to 2.5 microns, the thickness of said containment medium between about 8 and 18 microns, a blue pleochroic dye contained in said liquid crystal material that conforms to the structure thereof wherein the concentration of said dye in said liquid crystal material is on the order between about .6% and 2.0%, and a fluorescent reflector disposed on a non-viewing side of said containment medium. The apparatus of Claim 21 wherein the concentration of said dye is between about 1.0% and 1.5%. The apparatus of Claim 22 wherein the thickness of said containment medium is between 13 and 16 microns. The apparatus of Claim 23 wherein the difference between the ordinary and extraordinary indices of refraction is between about .23 and .30. The apparatus of Claim 24 wherein the difference between the ordinary and extraordinary indices of refraction is between about .23 and .26. The apparatus of Claim 25 wherein the mean volume diameter of said volumes is between about 1.3 and 1.8 microns. The apparatus of Claim 21 wherein said liquid crystal material and said containment medium cooperate to backscatter, absorb and transmit light incident thereon independently of the polarization of such incident light. The apparatus of Claim 27 further including electrode means for applying an electric field across said liquid crystal materia 29. The apparatus of Claim 28 further including substrate means for supporting said electrode means. The apparatus of Claim 29 further including circuit means for controlling the application of said electric field. A display, comprising: a liquid crystal material; a containment medium for containing plural volumes of said -liquid crystal material, said medium producing a distorted alignment of said liquid crystal material which at least one of scatters and absorbs light and which in response to a prescribed input reduces the amount of such scattering or absorption; a blue pleochroic dye contained in said volumes with said liquid crystal material to conform to the structure thereof, said dye blocking the transmission of light at wavelengths between 550 and 650 nanometers in the absence of said prescribed input; and a fluorescent reflector disposed on a non- viewing side of said medium. The display of Claims 31 wherein said dye is present in said liquid crystal material at a concentration of between about 0.50 and 2.0 percent. The display of Claim 31 wherein said reflector emits yellow, orange or red light. A liquid crystal apparatus comprising: a containment medium, a birefringent liquid crystal material wherein the difference between the extraordinary index of refraction of said liquid crystal material and the containment medium is greater than or equal to about .23, said liquid crystal material dispersed in plural volumes in said containment medium wherein said volumes have a size from about .5 to 3.0 microns, the thickness of said containment medium between about 8 and 18 microns, and a pleochroic dye contained in said liquid crystal material that conforms to the structure thereof wherein the concentration of said dye in said liquid crystal material is on the order between about .6% and 1.2%. |
| CPC Classification | 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 |
| Extended Family | 084-593-367-147-978 078-707-227-656-645 168-595-148-740-856 034-912-418-511-082 099-486-740-282-096 071-241-662-160-322 047-544-079-554-234 185-798-856-696-872 133-091-695-835-070 090-329-309-665-130 |
| Patent ID | 1990003593 |
| Inventor/Author | Wiley Richard Drzaic Paul |
| IPC | G02F1/137 G02F1/1333 G02F1/1334 |
| Status | Patented |
| Simple Family | 090-329-309-665-130 084-593-367-147-978 168-595-148-740-856 034-912-418-511-082 071-241-662-160-322 047-544-079-554-234 185-798-856-696-872 078-707-227-656-645 133-091-695-835-070 |
| CPC (with Group) | G02F1/1334 G02F1/13725 |
| Issuing Authority | World Intellectual Property Organization (WIPO) |
| Kind | Patent Application Publication |
