LCD with reduced canopy reflection having a retarder of 220-320

Details LCD with reduced canopy reflection having a retarder of 220-320 LCD with reduced canopy reflection having a retarder of 220-320

1995-06-07

1996-11-26

Gross, Anita Pellman

Optical: systems and elements

Holographic system or element

Using a hologram as an optical element

359 63, 359 53, G02F 11341, G02F 11335

Patent

active

055791395

ABSTRACT:
A liquid crystal display and corresponding method are provided for reducing display image reflections off of a reflection point on an external medium (e.g. cockpit canopy or automotive windshield). A retarder is provided on the front side of the display so that the polarization direction of the display image is substantially parallel to the plane of incidence when the image reaches the reflection point. Additionally, the angle of incidence .THETA..sub.i is substantially matched to the Brewster angle .THETA..sub.P in order to maximize the reduction of reflection at the reflection point. The retarder has a retardation value of from about 220-320 nm according to certain embodiments, and is a 1/2.lambda. retarder according to preferred embodiments.

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Eugene Hecht, "Optics", pp. 296-300, 1987, Second Edition.

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