Projection system and display apparatus for compressing and expa

Details Projection system and display apparatus for compressing and expa Projection system and display apparatus for compressing and expa

1992-04-24

1995-01-31

Groody, James J.

Television

Video display

Projection device

348751, 359454, 359670, H04N 574, H04N 931

Patent

active

053862520

ABSTRACT:
A projection system for pictures and a projection display apparatus which are designed to improve the luminance and contrast of a magnified picture on a projection screen by increasing the luminous flux projected within the effective size of projection optical systems. The projection display apparatus has a picture compression device for compressing the aspect ratio of the source picture formed on the face plate panel (PNL) of a projection cathode-ray tube (PRT) or a liquid crystal panel (LCP) to make it substantially 1 and an optical system for extending a picture (EXT) for extending the source picture having the same aspect ratio as that of the original picture. With this construction, the whole luminous flux passing the effective size of the projection optical system is maximized with the effect of improving the luminance and contrast of the magnified pictured projected onto the projection screen.

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