UNIFORM DIFFRACTIVE BACKLIGHT

A backlight is provided for illuminating an at least partially transmissive display. The backlight includes a light source. A light guide receives the light from an edge surface and guides the light by total internal reflection. The light is extracted from the lightguide using sub-wavelength extract...

Ausführliche Beschreibung

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Bibliographische Detailangaben
Hauptverfasser: PAPAKONSTANTINOU IOANNIS, MONTGOMERY DAVID J
Format: Patent
Sprache:eng
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Beschreibung
Zusammenfassung:A backlight is provided for illuminating an at least partially transmissive display. The backlight includes a light source. A light guide receives the light from an edge surface and guides the light by total internal reflection. The light is extracted from the lightguide using sub-wavelength extraction features designed on the basis of one grating structure with a second interlinks structure cut into the first structure. The first structure determines the extraction properties. The second structure determines the extraction efficiency and uniformity of the system. Higher efficiency and more uniform sub-wavelength extraction are possible with a device in accordance with the invention.