Electronic light control visor with two mutually...

G - Physics – 02 – F

Patent

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Details

G02F 1/133 (2006.01) A61F 9/06 (2006.01) G01J 1/32 (2006.01) G02F 1/1335 (2006.01) G05D 25/02 (2006.01)

Patent

CA 2241154

An electronically controlled visor (10) that includes a panel (20) composed of a number of liquid crystal pixels (22) that act as shutters to attenuate offending light sources. Pixels (22) are driven by electronic control unit (40) that in turn is driven by light sensor assemblies (60) that detect the angle of incidence of the offending radiation. A correlation exists between the elements of the light sensor assemblies (60) that are activated and the pixels (22) that end up being energized, changing their opacity, as a result of detecting the offending light source so that the latter can be attenuated. A bias adjustment control circuit adjusts the level of light that is to be considered offending (damaging or distracting to a user). Sections (24) of the panel (20) comprising several pixels (22) can be activated together or in non- contiguous patterns in order to optimize the effectiveness of the attenuation with a minimum of peripheral unneeded attenuation of neighboring pixels.

La présente invention concerne un pare-lumière (10) à commande électronique, qui comprend un panneau (20) constitué par un certain nombre de pixels (22) de cristaux liquides qui jouent le rôle d'obturateurs pour atténuer les sources lumineuses gênantes. Les pixels (22) sont commandés par l'unité électronique de commande (40), qui est elle-même commandée par des assemblages de capteurs lumineux (60), qui détectent l'angle d'incidence du rayonnement gênant. Il existe une corrélation entre les éléments des ensembles de capteurs lumineux (60) qui sont excités et les pixels (22) qui sont finalement rendus actifs, changeant d'opacité, à la suite de la détection de la source de lumière gênante, de telle sorte que celle-ci peut être atténuée. Un circuit de commande de réglage de polarisation règle le niveau de lumière qui doit être considéré comme gênant (nocif ou gênant pour l'utilisateur). Des parties (24) du panneau (20) comprenant plusieurs pixels (22) peuvent être rendues actives ensemble ou selon des motifs non contigus afin de rendre optimale l'efficacité de l'atténuation avec un minimum d'atténuation périphérique superflue de pixels voisins.

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