Holographic transflector

Optical: systems and elements – Holographic system or element – Using a hologram as an optical element

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Details

359599, 359636, 349 64, 349113, G02B 532, G02B 502, G02F 11335

Patent

active

059262931

ABSTRACT:
A light-diffusing holographic transflector comprising a holographic layer and a transflective layer is disclosed. The transflector is capable under good ambient lighting conditions of illuminating an LCD display element by holographic reflection, and under poor ambient lighting conditions, by the transmission therethrough of internal edge- or back-lighting. The transmission of light is accomplished to form a predetermined visually-perceptible image (e.g., graphics, designs, and logos) by the provision in said transflector of a corresponding pattern of light-transmitting microholes. The light-transmitting microholes are formed preferably by laser ablation or etching.

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J.M. Tedesco et al., "Holographic Diffusers for LCD Backlights and Projection Screens", SID International Symposium-Digest of Technical Papers, vol. 24, No. 1, May 1, 1993.

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