Computer graphics processing and selective visual display system – Plural physical display element control system – Segmented display elements
Patent
1997-11-17
1999-11-23
Shalwala, Bipin H.
Computer graphics processing and selective visual display system
Plural physical display element control system
Segmented display elements
345 84, 348744, 348756, 349 24, 349 25, G02F 1135
Patent
active
059908530
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates a projection type image displaying apparatus for displaying images of television, VTR or the like through larger picture scenes with higher quality.
BACKGROUND ART
Recently, images of television, VTR or the like are enlarged. Development of the image displaying apparatus for displaying larger picture scenes is active. For the reason, larger size is difficult to make in the conventional direct viewing type television. Also, in the projection type image displaying apparatus using a CRT or a liquid crystal displaying apparatus such as liquid crystal panel (hereinafter referred to as TFT-LCD) driving by a thin film transistor liquid crystal panel, it becomes difficult to be higher in resolution for brighter operation. A projection type image displaying apparatus attracts public attention, using a light storing, or writing, optically addressed spatial light modulation (hereinafter referred to as OASLM) with a photoconductive layer and a modulating layer being combined (for example, Y. Tanaka and others, Japanese Journal of Applied Physics, Vol. 33 in 1994, Page 3469 through Page 3477 (Jpn. J. Appl. Phys. 33 (1994) pp. 3469-3477)).
To understand the features of the present invention, the summary of the projection type image displaying apparatus using the most fundamental OASLM will be described in accordance with FIG. 17 through FIG. 27. The explanation in accordance with FIG. 17 through FIG. 27 indicates the contents experimented by us inventors, and is not prior art. FIG. 17 shows the basic construction of the OASLM. The OASLM 151 has construction where a photoconductive layer 4, a light reflection layer 5, and a light modulation 6 are held between glass substrates 2 and 2' with conductive transparent electrodes 3 and 3' being respectively provided on it. The light reflection layer 5 is divided into a plurality of pixels as shown. The photoconductive layer 4 is etched through the gaps between the pixels and a light absorbing layer 7 is formed therein.
When the write lights are inputted into the photoconductive layer 4 from the side of the glass substrate 2 of the OASLM 151, the voltage corresponding to the two-dimensional light intensity distribution of the image is applied upon the light modulation layer 6 and it switches in accordance with the voltage. As a result, reading lights which come from the side of the glass substrate 2' are modulated within the light modulation layer 6 and are outputted after the reflection by the light reflection layer 5. The light absorbing layer 7 prevents the reading lights from leaking to the photoconductive layer 4 from between the pixels of light reflection layer 5.
A projection type image displaying apparatus using the OASLM will be described in FIG. 18. The CRT, TFT-LCD and so on are used as an image source 8. The image inputting to the OASLM 151 is operated by focusing write lights 9 which are images of the image source 8 on the photoconductive layer 4 by the write lens 10. The reading lights 12 from the light source 11 are incident from the side of the light modulation layer 6 of the OASLM 151. The reading lights are modulated by the light modulation layer 6. After that, the lights have been reflected by the reflection layer 5, and are outputted through the light modulating layer 6 again. The output lights 13 are visualized through the visualizing means 14 and are enlargingly projected onto the screen 16 by the projection lens 15. The driving signal generating circuit 30 produces a driving signal S5 which drives the OASLM 151, and is produced from the vertical synchronous signal from the image source 8, to erase, and/or store images from the image source 8.
A liquid crystal material such as nematic type liquid crystal, ferroelectric liquid crystal and so on can be used as the light modulation layer 6, and the amorphous silicon of p-i-n structure can be used as the photoconductive layer 4. As a visualizing means 14, a polarization beam splitter can be used, and a metal hyride lamp, a xenon lamp or the like can be used as t
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"Analysis of Charge-Controlled Gray Scale in Ferroelectric Liquid Crystal Optically Addressed Spatial Light Modulator", Yukio Tanaka et al., vol. 33 (19944) pp. 3469-3477.
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Akiyama Koji
Kawakami Toshikatsu
Kuratomi Yasunori
Miyai Hiroshi
Muto Yasuaki
Kovalick Vincent E.
Matsushita Electric - Industrial Co., Ltd.
Shalwala Bipin H.
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