Victor Company of Japan, Limited

Jvc Kenwood Corporation

Nippon Hoso' Kyokai

Makoto Yoshimura

Masato Furuya

Masaru Kanazawa

Yuichi Kusakabe

An optical system attaining a nearly double resolving power in spite of one projector and also eliminating a convergence device is provided. The system includes an 1:1 relay lens in place of a projector lens of a RGB split-combine projection system, and a quarter-wave plate for P-S polarization separation. In operation, once-modulated RGB composite light is divided into a P-polarized light and a S-polarized light by a PS separation wire grid. The S-polarized light is modulated by a luminance signal Yat a Ydevice. The P-polarized light is modulated by a luminance signal Yat a Ydevice. The lights modulated by the Y/Ydevices are combined with each other at a PS composite wire grid to project a synthetic light on a screen.

Projection display device and optical system modulating separated P-polarized light and S-polarazed light

Light in primary colors RGB modulated in a first modulation optical system is transmitted through a relay lens () and further divided into a P-polarized light and an S-polarized light by a PS separation wire grid (). The S-polarized light is transmitted through a wavelength spectral filter () to select red/green/blue light components R, G, Bof 615, 515, 450 nm in wavelength, which are then modulated by a Ydevice (). The P-polarized light is transmitted through a wavelength spectral filter () to select red/green/blue light components R, G, Bof 650, 550, 475 nm in wavelength, which are then modulated by a Ydevice (). The 3 -primary color lights modulated by the Y/Ydevices (), () are combined with each other at a PS composite wire grid () to project a synthetic light on a screen.

Growing community of inventors

Yokohama, Japan

Makoto Yoshimura