Projection display apparatus

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United States of America Patent

PATENT NO 9235111
APP PUB NO 20140092320A1
SERIAL NO

14039565

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Abstract

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A projection display apparatus includes a polarization beam splitter, a first phase compensation plate including two layers, and a light modulator. Each layer has a constant axial angle, and an optical axis of each layer inclines with respect to the x axis in an xz plane. The axial angle of the layer closer to the polarization beam splitter among the two layers is larger than the axial angle of the layer farther from the polarization beam splitter. 20°≦θmax−θmin≦80° is satisfied where θmax is a maximum value of the axial angle and θmin is a minimum value of the axial angle. 40°≦θave≦70° is satisfied where θave is an average value of axial angles of the two layers.

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Patent Owner(s)

  • CANON KABUSHIKI KAISHA

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Yamaguchi, Yutaka Utsunomiya, JP 112 1445

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