GB1201230A - Chromatic display or storage device - Google Patents
Chromatic display or storage deviceInfo
- Publication number
- GB1201230A GB1201230A GB538269A GB538269A GB1201230A GB 1201230 A GB1201230 A GB 1201230A GB 538269 A GB538269 A GB 538269A GB 538269 A GB538269 A GB 538269A GB 1201230 A GB1201230 A GB 1201230A
- Authority
- GB
- United Kingdom
- Prior art keywords
- cholesteric liquid
- electrode
- liquid crystalline
- chromatic
- transparent
- 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.)
- Expired
Links
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J29/00—Details of cathode-ray tubes or of electron-beam tubes of the types covered by group H01J31/00
- H01J29/02—Electrodes; Screens; Mounting, supporting, spacing or insulating thereof
- H01J29/10—Screens on or from which an image or pattern is formed, picked up, converted or stored
- H01J29/14—Screens on or from which an image or pattern is formed, picked up, converted or stored acting by discoloration, e.g. halide screen
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
- B41M5/00—Duplicating or marking methods; Sheet materials for use therein
- B41M5/26—Thermography ; Marking by high energetic means, e.g. laser otherwise than by burning, and characterised by the material used
- B41M5/28—Thermography ; Marking by high energetic means, e.g. laser otherwise than by burning, and characterised by the material used using thermochromic compounds or layers containing liquid crystals, microcapsules, bleachable dyes or heat- decomposable compounds, e.g. gas- liberating
- B41M5/281—Thermography ; Marking by high energetic means, e.g. laser otherwise than by burning, and characterised by the material used using thermochromic compounds or layers containing liquid crystals, microcapsules, bleachable dyes or heat- decomposable compounds, e.g. gas- liberating using liquid crystals only
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K19/00—Liquid crystal materials
- C09K19/52—Liquid crystal materials characterised by components which are not liquid crystals, e.g. additives with special physical aspect: solvents, solid particles
- C09K19/54—Additives having no specific mesophase characterised by their chemical composition
- C09K19/542—Macromolecular compounds
- C09K19/544—Macromolecular compounds as dispersing or encapsulating medium around the liquid crystal
-
- 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
-
- 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
- G02F1/1334—Constructional arrangements; Manufacturing methods based on polymer dispersed liquid crystals, e.g. microencapsulated 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
- G09G3/001—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes using specific devices not provided for in groups G09G3/02 - G09G3/36, e.g. using an intermediate record carrier such as a film slide; Projection systems; Display of non-alphanumerical information, solely or in combination with alphanumerical information, e.g. digital display on projected diapositive as background
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J29/00—Details of cathode-ray tubes or of electron-beam tubes of the types covered by group H01J31/00
- H01J29/02—Electrodes; Screens; Mounting, supporting, spacing or insulating thereof
- H01J29/10—Screens on or from which an image or pattern is formed, picked up, converted or stored
Landscapes
- Physics & Mathematics (AREA)
- Chemical & Material Sciences (AREA)
- Nonlinear Science (AREA)
- Crystallography & Structural Chemistry (AREA)
- Optics & Photonics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Mathematical Physics (AREA)
- Computer Hardware Design (AREA)
- Theoretical Computer Science (AREA)
- Dispersion Chemistry (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Liquid Crystal (AREA)
Abstract
1,201,230. Matrix displays. NATIONAL CASH REGISTER CO. 31 Jan., 1969 [23 Feb., 1968 (2)], No. 5382/69. Heading G5C. [Also in Divisions G1, H1 and H4] A chromatic display or storage device comprises disposed between a pair of spaced electrodes a cholesteric liquid crystalline member responsive to an electric filed and comprised of cholesteric liquid crystalline material enclosed in polymeric material. The member may comprise a plurality of individual minute droplets of cholesteric liquid crystalline material contained in a continuous polymeric film, or a plurality of minute polymeric capsules containing cholesteric liquid crystalline material, which capsules may be incorporated in and/or carried on a film of polymeric material. When an electric field is imposed on the cholesteric liquid crystalline member it instantaneously changes colour and/or reflective intensity (as viewed from incident white light) to shift from a first chromatic state to a second chromatic state. Upon removal of the electric field the colour changes from the second chromatic state to a third chromatic state which exhibits a colour (or reflective intensity) different from the colour given off in the second and first chromatic states. This third state does not fade readily and thus the retention ability of this third state by the device may be employed for storing information. By heating the member to the isotropic transition temperature of the cholesteric liquid crystals the third chromatic state is erasing and upon cooling the member returns to its original first state. A polychromatic display may be achieved by having a plurality of different cholesteric liquid crystalline materials in different layers, or in one layer, the droplets (or capsules) being formed of different material. The cholesteric liquid crystalline materials may comprise mixtures of different liquid crystalline substances. Polychormatic displays may also be achieved by using a plurality of switched electrodes as one of the electrodes, and by using a plurality of mixtures each responsive to a different field potential to exhibit different colours. The polymer matrix-retained or encapsulated cholesteric liquid crystal droplets may be prepared to be either flat or curved, and either rigid or flexible. The capsular wall material of the dropletretaining polymeric matrix may be tinted and thusa ct as a colour filter. Both electrodes may comprise non-transparent material although it is preferable that the first electrode (the electrode closer to the viewer) is transparent. When the first electrode is non-transparent e.g. in the form of thin electron-emitting resistive wire(s) it is preferably positioned so as not to obstruct the observed image. The second electrode need not be transparent nor coextensive with the first electrode, and it may for example comprise the pattern of a printed circuit. An opaque e.g. black, constrasting background is preferably provided behind the cholesteric liquid crystalline member, either in front or behind the second electrode. Specific embodiments described comprise, Figs. 1 and 2, a transparent insulating protective layer 1, a transparent first electrode 2, the cholesteric liquid crystalline member 3, a black lacquer insulating film 4, conducting element(s) 5 and a lower protective layer 6. In Fig. 2 to erase the third chromatic state a current is passed through leads 7 and 7<SP>1</SP>. The device may be disposed within a vacuum tube 9, Fig. 3, the conductive elements 5 being held at positive potentials and a current being passed through thin, non-transparent resistive wire 12 (which acts as the second electrode) so that it is heated and emits electrons which are drawn to the surface of the liquid crystal film 3. The third chromatic state may be erased by using a heat lamp or heat wires or by passing a current through elements 5. The device may comprise, coated on the inner surface of the faceplate of a CRT, a transparent electrode which is held at a positive potential, a layer of liquid crystal and a black insulator film, the black insulator film being scanned by the electron beam, Fig. 4 (not shown). Alternatively the latter device may be coated on the outside surface of the faceplate of a CRT, the faceplate having a plurality of conductive wires extending therethrough, Fig. 5 (not shown). The device of Fig. 6 comprises a transparent conductive coating 2 on a substrate 1, bus-bars 7, 7<SP>1</SP> attached to coating 2, a black insulator film 4, a cholesteric liquid crystal layer 3, and conductor elements 5 each having a pair of leads 8, 8<SP>1</SP>. In a first mode of operation a potential is applied between coating 2 and any one or more of resistive elements 5. The areas in the third chromatic state (when the field is removed) may be selectively erased by passing current through the elements 5. To erase the entire stored image the remaining elements may be heated or a current may be passed through coating 2. In a second mode of operation a current is passed through elements 5 to raise the temperature of the liquid crystal above the isotropic melting point. The heated portion becomes non-reflective in contrast to the coloured appearance of the unheated areas. When the current is interrupted the elements cools to ambient temperature and the liquid crystal returns to its initial coloured (first chromatic) state. Thus different characters corresponding to the shape of the elements 5 may be displaced in transient manner. To store an image a voltage source is connected between one of leads 8, 8<SP>1</SP> and electrode 2. Methods of preparation of the cholesteric liquid crystalline member and construction of the devices together with examples of materials used therein are given in the Specification.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US70782368A | 1968-02-23 | 1968-02-23 | |
US70770668A | 1968-02-23 | 1968-02-23 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB1201230A true GB1201230A (en) | 1970-08-05 |
Family
ID=27107936
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB538269A Expired GB1201230A (en) | 1968-02-23 | 1969-01-31 | Chromatic display or storage device |
Country Status (6)
Country | Link |
---|---|
CH (1) | CH523564A (en) |
DE (1) | DE1908118B2 (en) |
FR (1) | FR1601599A (en) |
GB (1) | GB1201230A (en) |
NL (1) | NL163329C (en) |
SE (1) | SE338386B (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2216282A (en) * | 1988-02-19 | 1989-10-04 | Gen Electric Co Plc | Optical storage devices |
WO2010115809A1 (en) * | 2009-04-06 | 2010-10-14 | Giesecke & Devrient Gmbh | Microcapsule comprising liquid crystal |
Families Citing this family (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2300856A1 (en) * | 1973-01-09 | 1974-07-18 | Delog Detag Flachglas Ag | OPTICAL DISPLAY ELEMENT WITH LIQUID CRYSTALS |
CA1273192A (en) * | 1985-06-10 | 1990-08-28 | Nuno A. Vaz | Liquid crystal droplets dispersed in thin films of uv- curable polymers |
US4728547A (en) * | 1985-06-10 | 1988-03-01 | General Motors Corporation | Liquid crystal droplets dispersed in thin films of UV-curable polymers |
US4891152A (en) * | 1987-12-28 | 1990-01-02 | Hughes Aircraft Company | Dispersion of liquid crystal droplets in a photopolymerized matrix and devices made therefrom |
DE69021789T2 (en) * | 1989-06-22 | 1996-01-11 | Victor Company Of Japan | Recording medium. |
DE4106353A1 (en) * | 1991-02-28 | 1992-09-03 | Basf Ag | REVERSIBLE OR IRREVERSIBLE GENERATION OF AN IMAGE |
CN110200421B (en) * | 2019-05-31 | 2021-01-08 | 上海智蕙林医疗科技有限公司 | Observation cabinet and article viewing control method |
-
1968
- 1968-12-30 FR FR1601599D patent/FR1601599A/fr not_active Expired
-
1969
- 1969-01-31 GB GB538269A patent/GB1201230A/en not_active Expired
- 1969-02-19 DE DE19691908118 patent/DE1908118B2/en not_active Withdrawn
- 1969-02-20 CH CH273069A patent/CH523564A/en not_active IP Right Cessation
- 1969-02-21 SE SE243669A patent/SE338386B/xx unknown
- 1969-02-24 NL NL6902850A patent/NL163329C/en active
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2216282A (en) * | 1988-02-19 | 1989-10-04 | Gen Electric Co Plc | Optical storage devices |
US5073219A (en) * | 1988-02-19 | 1991-12-17 | The General Electric Company, P.L.C. | Method of and apparatus for making optical storage devices |
GB2216282B (en) * | 1988-02-19 | 1992-09-23 | Gen Electric Co Plc | Optical storage devices |
WO2010115809A1 (en) * | 2009-04-06 | 2010-10-14 | Giesecke & Devrient Gmbh | Microcapsule comprising liquid crystal |
RU2537610C2 (en) * | 2009-04-06 | 2015-01-10 | Гизеке Унд Девриент Гмбх | Microcapsule with liquid crystal |
Also Published As
Publication number | Publication date |
---|---|
FR1601599A (en) | 1970-08-31 |
DE1908118B2 (en) | 1971-11-11 |
NL163329C (en) | 1980-08-15 |
DE1908118A1 (en) | 1969-10-02 |
SE338386B (en) | 1971-09-06 |
NL6902850A (en) | 1969-08-26 |
CH523564A (en) | 1972-05-31 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PS | Patent sealed | ||
732 | Registration of transactions, instruments or events in the register (sect. 32/1977) | ||
PCNP | Patent ceased through non-payment of renewal fee |