Array addressing of pneumatically switched image display device

G - Physics – 09 – F

Patent

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Details

G09F 9/37 (2006.01)

Patent

CA 2301320

Apparature for controlling an image display device having at least one element (10) with a reflective state in which incident light undergoes total internal reflection and a non-reflective state in which the total internal reflection is prevented. A member (18) is positioned adjacent the element for deformation of the member between a first position in which a gap (20) remains between the member and the elements and a second positon in which the member is in optical contact with the element. The apparatus incorporates a support structure (26) having one or more display chambers (24). Each display chamber contains one of the elements and members aforesaid. A first aperture (32) is provided in the support structure for air communication between the display chamber and a second chamber (30) provided in the support structure. A preferably elastomeric valve member (38) is provided in the second chamber, for deformation of the valve member between a closed position in which the valve member is biased against the first aperture to prevent air communication through the first aperture and an open position in which the valve member is biased away from the first aperture to permit air communication through the first aperture. A second aperture (36) is provided in the support structure for air communication against a base of the valve member; and, a third aperture (34) is provided in the support structure for air communication through the second chamber and through the first aperture when the valve member is in the open position.

L'invention concerne un appareil de commande d'un dispositif d'affichage d'images comprenant au moins un élément (10), qui peut passer d'un état réfléchissant permettant de réfléchir entièrement la lumière incidente vers l'intérieur, à un état non réfléchissant empêchant toute réflexion de cette lumière vers l'intérieur. Un second élément (18) est placé à proximité du premier afin de passer d'une première position, dans laquelle un espacement (20) sépare ces deux éléments, à une seconde position, dans laquelle le second élément est en contact optique avec le premier. Cet appareil comprend également une structure support (26), pourvue d'une ou plusieurs chambres d'affichage (24), chacune d'entre elles contenant l'un des deux éléments susmentionnés. Un premier orifice (32) est ménagé sur cette structure support afin de permettre à l'air de circuler entre la chambre d'affichage et une seconde chambre (30), située dans ladite structure support. Une soupape de préférence élastomère (38), placée à l'intérieur de cette seconde chambre, passe d'une position fermée, dans laquelle cette soupape est orientée vers le premier orifice afin d'empêcher l'air de passer par celui-ci, à une position ouverte, dans laquelle ladite soupape est détournée de ce premier orifice afin de permettre à l'air de passer par celui-ci. Un deuxième orifice (36), ménagé sur ladite structure support, permet à l'air de circuler jusqu'au culot de la soupape, un troisième orifice (34), également ménagé sur ladite structure support, permettant en outre à l'air de traverser la seconde chambre et le deuxième orifice lorsque ladite soupape se trouve en position ouverte.

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