Parallax-reducing, luminance-preserving diffuser

G - Physics – 02 – B

Patent

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G02B 5/02 (2006.01) G02F 1/1335 (2006.01)

Patent

CA 2573684

A diffuser incorporates diffuser elements (10) that each include a waveguide (12) coupled between a concentrator (14) and an inverse concentrator (16). The diffuser (44) may be disposed between a backlight (102) and a modulator (114) in a display (100). Luminance ratios of light rays emitted by a low resolution image-forming backlight (102) toward a high resolution light modulator (114) may be preserved such that, for viewing directions within the display's preferred angular viewing range, an observer perceives no significant change in the luminance of displayed images, irrespective of changes in the observer's viewing direction.

Cette invention concerne un diffuseur comprenant des éléments de diffuseur (10) qui comprennent chacun un guide d'ondes (12) couplé entre un concentrateur (14) et un concentrateur inverse (16). Le diffuseur (44) peut être placé entre une unité de rétroéclairage (102) et un modulateur (114) dans un écran (100). Des rapports de luminance de rayons lumineux émis par une unité rétroéclairage de formation d'images basse résolution (102) en direction d'un modulateur de lumière haute résolution (114) peuvent être conservés de telle sorte que, pour des directions d'observation comprises dans une plage d'observation angulaire préférée de l'écran, un observateur ne perçoive aucun changement important de luminance des images affichées, quels que soient les changements de direction d'observation de l'observateur.

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