Holographic high contrast viewing screen embedded in a...

G - Physics – 02 – F

Patent

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G02F 1/1335 (2006.01) G02B 5/32 (2006.01)

Patent

CA 2235247

Systems and methods for shaping light from a liquid crystal display such that the field of view, including the horizontal and vertical extent, can be determined, in advance by the manufacturer. An LCD device includes a first substrate (10) having a first electrode (20); a light shaping holographic surface relief diffuser (30) connected to said first electrode and having a first orientation and a first refractive index; a liquid crystal (70) adjacent said holographic diffuser, an alignment layer (60) adjacent said liquid crystal and having a second orientation that is substantially orthogonal to said first orientation; and a second substrate (10) having a second electrode (80) connected to said alignment layer, the liquid crystal having a second refractive index that is substantially equal to the first refractive index in the absence of a liquid crystal driving voltage, and varies as a function of such driving voltage.

Systèmes et procédés pour la mise en forme de la lumière émise par un afficheur à cristaux liquides, permettant au fabricant de déterminer à l'avance le champ visuel, et notamment ses étendues horizontale et verticale. Un dispositif à cristaux liquides comprend un premier substrat (10) possédant une première électrode (20); un diffuseur holographique à relief superficiel (30) pour la mise en forme de la lumière, ce diffuseur étant relié à ladite première électrode, et présentant une première orientation et un premier indice de réfraction; un cristal liquide (70) contigu audit diffuseur holographique; une couche d'alignement (60) contiguë audit cristal liquide et présentant une seconde orientation sensiblement orthogonale à ladite première orientation; et un second substrat (10) possédant une seconde électrode (80) reliée à ladite couche d'alignement. Le cristal liquide présente un second indice de réfraction qui est sensiblement égal au premier indice de réfraction en l'absence d'une tension d'attaque du cristal liquide, et qui varie en fonction de cette tension d'attaque.

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