Image display apparatus

Details Image display apparatus Image display apparatus

1994-06-22

1998-04-21

Powell, Mark R.

Computer graphics processing and selective visual display system

Image superposition by optical means

Operator body-mounted heads-up display

H04N 564, H04N 1700

Patent

active

057422621

ABSTRACT:
An image display apparatus, e.g., a head-mounted image display apparatus, which uses a compact optical system and yet has minimal aberrations and a large exit pupil diameter. The image display apparatus has a liquid crystal display device (2), and an ocular lens (3) for projecting an image displayed by the liquid crystal display device (2) on a user's retina. A pair of first and second diffraction gratings (11) and (12) are provided in an optical path lying between the ocular lens (3) and an exit pupil (6) formed by the ocular lens (3). The first and second diffraction gratings (11) and (12) are arranged so that the angle of diffraction caused by the second diffraction grating (12) for each wavelength of the displayed image is approximately coincident with the angle of diffraction caused by the first diffraction grating (11).

REFERENCES:
patent: 4636866 (1987-01-01), Hattori
patent: 5035473 (1991-07-01), Kuwayama et al.
patent: 5106179 (1992-04-01), Kamaya et al.
patent: 5539528 (1996-07-01), Togino et al.

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