Display apparatus

Details Display apparatus Display apparatus

1993-12-20

1995-05-09

Gross, Anita Pellman

Optical: systems and elements

Holographic system or element

Using a hologram as an optical element

345 8, 351158, 359630, 359 83, G02F 1133, G02B 2714

Patent

active

054145449

ABSTRACT:
Disclosed is a head-mount type display apparatus having an optical system which is of the back-irradiation type by which the user can see an extremely high-quality video image and by which the user makes only in-focus adjustment thereby improving operation convenience. The head-mount type display apparatus includes at least two optical systems each including a light source, a LCD through which the light from the light source is passed, a reflecting plate which reflects the light passing through the LCD, a screen on the back side of which the reflected light from the reflecting plate is focused to form an image and a lens by which the light from the screen is focused to form an image at a viewing point, and a head-mount type member for supporting the two optical systems which are opposed to left and right eyes. According to the preferred embodiment, interference and distortion in the projected images arising from the image of the edges of the LCDs is substantially reduced.

REFERENCES:
patent: 4561723 (1985-12-01), Hamano et al.
patent: 4695129 (1987-09-01), Faessen et al.
patent: 4896209 (1990-01-01), Matsuzaki et al.
patent: 5129716 (1992-07-01), Holakovsky et al.
patent: 5334991 (1994-08-01), Wells et al.
British Search Report.

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