Optical: systems and elements – Glare or unwanted light reduction – Directional or angular discrimination
Reexamination Certificate
2006-08-01
2006-08-01
Thomas, Alexander S. (Department: 1772)
Optical: systems and elements
Glare or unwanted light reduction
Directional or angular discrimination
C359S614000, C428S212000
Reexamination Certificate
active
07083292
ABSTRACT:
A PDP resin sheet11capable of transmitting a rectilinear light is prepared by alternately arranging a transparent section12and a dark section13in the direction of the sheet surface. The transparent section12and the dark section13may be formed perpendicular or inclined to the sheet surface, respectively. In the sheet11, the thickness T of the sheet may be about 0.12 to 0.25 mm, and the angle of the dark section13to the sheet surface may be about 70 to 90°. In addition, the ratio [P/T] of the periodical width P of the dark section relative to the thickness T of the sheet may be about 1/1 to 1/2, and the ratio [W1/W2] of the width W1of the transparent section relative to the width W2of the dark section may be about 30/1 to 10/1. Soft resins constituting the transparent section and the dark section may for example be an olefinic resin (particularly an ethylene-vinyl ester copolymer). Such a PDP sheet ensures an image display at high contrast even under a daylight environment, without reducing a plasma display luminance.
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Daicel Chemical Industries Ltd.
Thomas Alexander S.
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