A device for backlighting a liquid crystal panel

G - Physics – 02 – F

Patent

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Details

G02F 1/1335 (2006.01) G02F 1/13357 (2006.01)

Patent

CA 2207277

A device for backlighting a liquid crystal panel (4) comprises a source (1) of diffuse light, a quarter wave retarder (3), and a circularly polarizing element (2) arranged between the source and the retarder. In operation, diffuse light from the source passes through the circularly polarizing element and then through the retarder, thereby providing un-collimated plane-polarized light for backlighting a liquid crystal display. The device can give the advantage of enabling the use of cheaper, lower quality optical elements and eliminating expensive collimators.

Un dispositif pour éclairer depuis l'arrière un panneau (4) à cristaux liquides comprend une source (1) de lumière diffuse, un dispositif (3) de retardement par un quart d'onde et un élément de polarisation circulaire (2) disposé entre la source et le dispositif de retardement. En opération, la lumière diffuse de la source traverse l'élément de polarisation circulaire et ensuite le dispositif de retardement, ce qui fournit une lumière non collimatée et polarisée dans un plan pour éclairer depuis l'arrière un affichage à cristaux liquides. D'une manière avantageuse, le dispositif peut permettre d'utiliser des éléments optiques meilleur marché et de moins bonne qualité optique, et d'éliminer les collimateurs, qui sont onéreux.

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