A system for displaying an image or object in the presence of ambient light

A required visual signal for direct observation is produced from a first source of light (4) in the presence of a second source of light, such as ambient light. Light is transmitted from the first source to a defined surface (10) or defined region distant from the first source (4). A means (10) for...

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Bibliographic Details
Main Author SHANKS, IAN ALEXANDER
Format Patent
LanguageEnglish
French
German
Published 19.04.1995
Edition5
Subjects
ACCESSORIES THEREFOR
ADVERTISING
APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USINGWAVES OTHER THAN OPTICAL WAVES
APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FORPROJECTING OR VIEWING THEM
CINEMATOGRAPHY
CRYPTOGRAPHY
DEVICES OR ARRANGEMENTS, THE OPTICAL OPERATION OF WHICH ISMODIFIED BY CHANGING THE OPTICAL PROPERTIES OF THE MEDIUM OF THEDEVICES OR ARRANGEMENTS FOR THE CONTROL OF THE INTENSITY,COLOUR, PHASE, POLARISATION OR DIRECTION OF LIGHT, e.g.SWITCHING, GATING, MODULATING OR DEMODULATING
DISPLAY
DISPLAYING
EDUCATION
ELECTRIC COMMUNICATION TECHNIQUE
ELECTRICITY
ELECTROGRAPHY
FREQUENCY-CHANGING
HOLOGRAPHY
LABELS OR NAME-PLATES
NON-LINEAR OPTICS
OPTICAL ANALOGUE/DIGITAL CONVERTERS
OPTICAL LOGIC ELEMENTS
OPTICS
PHOTOGRAPHY
PHYSICS
PICTORIAL COMMUNICATION, e.g. TELEVISION
SEALS
SIGNS
TECHNIQUES OR PROCEDURES FOR THE OPERATION THEREOF
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Summary:A required visual signal for direct observation is produced from a first source of light (4) in the presence of a second source of light, such as ambient light. Light is transmitted from the first source to a defined surface (10) or defined region distant from the first source (4). A means (10) for modulating light is operated between at least a first mode and a second mode. This operation is synchronised with a varying of the intensity of at least one of the sources of light at or above a given frequency equal to or greater than the critical fusion frequency for the size and luminance of the required visual signal. When the modulating means (10) is in the first mode, this allows the required visual signal to be directly observed on the defined surface or in the defined region. When the modulating means (10) is in the second mode, this allows the effect produced by any light from the second source incident on the defined surface or in the defined region to be reduced.
Bibliography:Application Number: EP19890310225