Reflective display device and a light source for a display device
AssigneeSharp Kabushiki Kaisha
InventorsGraham John Woodgate, Marina Vladimirovna Khazova
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Abstract
A reflective liquid crystal display device (LCD) (40) includes: a substrate (60), a reflecting layer (61), a liquid crystal layer (62), an electrode layer (63), a color filter layer (64), an upper substrate (65), and a polarizer (66). The reflective liquid crystal display device further includes a holographic field lens (67). By providing the holographic field lens, the LCD can be used with a closely placed, offset light source (41), since the holographic field lens simultaneously concentrates light incident on the LCD and redirects it in a preferred direction. The holographic field lens can be provided within the structure of the LCD.
Claims41
A display device comprising:
- a spatial light modulator having an optical modulation layer;
- a reflector disposed behind the optical modulation layer with respect to a display direction;
- and
- a holographic field lens,
- wherein for a given angle of incidence, the diffraction efficiency of the holographic field lens varies in a gradient manner over the holographic field lens.
Dependencies are inferred from the claim text.