Image display apparatus

Details Image display apparatus Image display apparatus

1993-04-27

1996-04-30

Mullins, James B.

Optical: systems and elements

Holographic system or element

Using a hologram as an optical element

359562, 359563, 359569, 359 69, 359 95, G02F 11335, G02F 1137, G02B 2746, G02B 518

Patent

active

055130259

ABSTRACT:
An image display apparatus includes an image display device such as, for example, a liquid crystal display panel, having a plurality of dot-shaped picture elements arranged in a two-dimensional pattern, and a diffraction grating disposed on an optical path through which imagewise rays of light emerging from the device travel. To minimize a reduction in quality and contrast of an image displayed by the device, the member has a spatial cut-off frequency chosen to be of a value lying between the sampling frequency, determined by the pitch between picture elements of the image display device, and the Nyquist frequency. For the same purpose, the intensity of .+-.1st order light relative to the intensity of 0-th order light in the diffraction grating is within the range of 60 to 80% at a center wavelength of the image display device, and the sum of the intensity of the 0-th order light and that of the .+-.1st order light relative to that of total diffracted light is equal to or higher than 80% at the center wavelength of the device.

REFERENCES:
patent: 3914761 (1975-10-01), Murase et al.
patent: 4998800 (1991-03-01), Nishida et al.
patent: 5046827 (1991-09-01), Frost et al.
Patent Abstracts of Japan, vol. 15, No. 503, (P-1290) Dec. 19, 1991, JP-A-03 219 207, Sep. 26, 1991.
Patent Abstracts of Japan, vol. 9, No. 86, (P-349), Apr. 16, 1985, JP-A-59 214 825, Dec. 4, 1984.
SPIE vol. 679- Current Developments in Optical Engineering and Diffraction Phenomena, pp. 165-168, M. T. Gale, et al., "Diffractive Diffusers for Display Applications".

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