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1. (WO1992010130) METHOD AND APPARATUS FOR CONTROLLING PERCEIVED BRIGHTNESS USING A TIME VARYING SHUTTER
Latest bibliographic data on file with the International Bureau

Pub. No.: WO/1992/010130 International Application No.: PCT/US1991/005543
Publication Date: 25.06.1992 International Filing Date: 01.08.1991
Chapter 2 Demand Filed: 01.08.1991
IPC:
A61B 3/06 (2006.01) ,A61F 9/06 (2006.01) ,G02C 7/10 (2006.01) ,G02F 1/133 (2006.01)
A HUMAN NECESSITIES
61
MEDICAL OR VETERINARY SCIENCE; HYGIENE
B
DIAGNOSIS; SURGERY; IDENTIFICATION
3
Apparatus for testing the eyes; Instruments for examining the eyes
02
Subjective types, i.e. testing apparatus requiring the active assistance of the patient
06
for testing light sensitivity, e.g. adaptation; for testing colour vision
A HUMAN NECESSITIES
61
MEDICAL OR VETERINARY SCIENCE; HYGIENE
F
FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, E.G. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
9
Methods or devices for treatment of the eyes; Devices for putting in contact-lenses; Devices to correct squinting; Apparatus to guide the blind; Protective devices for the eyes, carried on the body or in the hand
04
Eye-masks
06
Masks, shields, or hoods for welders
G PHYSICS
02
OPTICS
C
SPECTACLES; SUNGLASSES OR GOGGLES INSOFAR AS THEY HAVE THE SAME FEATURES AS SPECTACLES; CONTACT LENSES
7
Optical parts
10
Filters, e.g. for facilitating adaptation of the eyes to the dark; Sunglasses
G PHYSICS
02
OPTICS
F
DEVICES OR ARRANGEMENTS, THE OPTICAL OPERATION OF WHICH IS MODIFIED BY CHANGING THE OPTICAL PROPERTIES OF THE MEDIUM OF THE DEVICES OR ARRANGEMENTS FOR THE CONTROL OF THE INTENSITY, COLOUR, PHASE, POLARISATION OR DIRECTION OF LIGHT, e.g. SWITCHING, GATING, MODULATING OR DEMODULATING; TECHNIQUES OR PROCEDURES FOR THE OPERATION THEREOF; FREQUENCY-CHANGING; NON-LINEAR OPTICS; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
1
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
01
for the control of the intensity, phase, polarisation or colour
13
based on liquid crystals, e.g. single liquid crystal display cells
133
Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
Applicants:
HUMPHREY ENGINEERING, INC. [US/US]; 15333 Via Del Sur Monte Sereno, CA 95030, US
Inventors:
HUMPHREY, John, M.; US
Agent:
LEAVITT, John, J.; 777 North First Street Suite 610 San Jose, CA 95112, US
Priority Data:
628,32314.12.1990US
Title (EN) METHOD AND APPARATUS FOR CONTROLLING PERCEIVED BRIGHTNESS USING A TIME VARYING SHUTTER
(FR) PROCEDE ET APPAREIL PERMETTANT DE COMMANDER LA LUMINOSITE PERÇUE A L'AIDE D'UN OBTURATEUR FAISANT VARIER LA DUREE
Abstract:
(EN) A method and apparatus is presented for successively interrupting the transmission of light through a transparent body at a frequency such that a scene viewed through the transparent body by a human eye is perceived as a continuous image that is less bright than actually, and is viewed with minimal color distortion. In one aspect of the invention, the lenses (17, 18) of spectacles (16) are provided with a layer of liquid crystal material that is normally transparent, but which responds to the application of an electrical charge (24) to render the liquid crystal layer non-transparent. By adjusting the frequency of application of successive electrical charges, the lenses (17, 18) admit light at full brightness for small increments of time, with minimal color distortion, and interrupt the transmission of light for small increments of time, so that the light admitted at full brightness is perceived as being less bright or dimmed. In another aspect, the transparent body (36) is ''nodalized'' so that small increments of the body are independently responsive to successive electrical charges, whereby the brightness of light passing through such ''nodes'' (37) is perceived as being less bright or dimmed.
(FR) Procédé et appareil permettant d'interrompre de manière successive la transmisison de lumière à travers un élément transparent à une fréquence telle que la scène vue par un ÷il humain à travers l'élément transparent est perçue comme une image continue dont la luminosité est inférieure à la luminosité réelle et présentant une dénaturation minimale des couleurs. Dans un mode d'exécution de l'invention, les verres (17, 18) d'une paire de lunettes (16) sont recouverts d'une couche de matériau de cristal liquide qui est transparent dans des conditions normales mais qui réagit à l'application d'une charge électrique (24) en opacifiant la couche de cristal liquide. En réglant la fréquence d'application des charges électriques successives, les verres (17, 18) reçoivent la lumière dans toute sa luminosité pendant des intervalles de temps faiblement augmentés, avec une dénaturation minimale des couleurs, et interrompent la transmission de lumière pendant des intervalles de temps faiblement augmentés, de sorte que la lumière reçue avec toute sa luminosité est perçue comme étant moins lumineuse ou atténuée. Dans un autre mode d'exécution de l'invention, l'élément transparent (36) est 'nodalisé' de sorte que de petites augmentations de l'élément réagissent de manière indépendante aux charges électriques successives et que, par conséquent, la luminosité de la lumière traversant de tels 'n÷uds' (37) est perçue comme étant moins forte ou atténuée.
Designated States: JP
European Patent Office (AT, BE, CH, DE, DK, ES, FR, GB, GR, IT, LU, NL, SE)
Publication Language: English (EN)
Filing Language: English (EN)
Also published as:
EP0611286