Optical: systems and elements – Holographic system or element – Using a hologram as an optical element
Patent
1989-11-30
1991-12-10
Miller, Stanley D.
Optical: systems and elements
Holographic system or element
Using a hologram as an optical element
359 72, G02F 1133
Patent
active
050712306
ABSTRACT:
Several large-screen displays making use of liquid crystal light valve have been realized. The photoactivated liquid crystal light valve is composed by intervening a photoconductor layer between a liquid crystal layer and an electrode. The photoconductor layer changes in impedance when exposed with light. Therefore, when light is emitted to the photoconductor layer while a voltage is applied between electrodes, the voltage applied to the exposed portion varies, and the orientation state of the liquid crystal layer changes. Thus, an image is formed on the liquid crystal layer. The structure for emitting/interrupting the light mentioned above may be reduced in size by using liquid crystal shutter arrays. As the liquid crystal layer usable in the liquid crystal shutter arrays, SmC* phase liquid crystal showing a ferrodielectric property may be used, so that the response may be enhanced. Therefore, not limited to the still picture display alone, a moving picture may be also displayed. Still further, since the liquid crystal shutter arrays are statically driven, the control is easy, and the number of electrodes may be increased. Thus, an image of high resolution may be displayed on the liquid crystal display valve.
REFERENCES:
patent: 4110014 (1978-08-01), Yevick
patent: 4622654 (1986-11-01), Yaniv et al.
patent: 4908584 (1990-03-01), Reichman
Joseph et al., "Response Time of a Liquid Crystal Image Transducer", Applied Optics vol. 17, No. 13, 1978, pp. 1987-1989.
Bleha et al., "Application of the Liquid Crystal Light Valve to Real-Time Optical Data Processing", Optical Engineering, vol. 17, No. 4, 1978, pp. 371-384.
Reif et al., "Hybrid Liquid Crystal Light Valve-Image Tube Devices for Optical Data Processing", SPIE, vol. 83 Optical Information Processing (1976), pp. 34-43.
Hatano Akitsugu
Ishii Yutaka
Gross Anita Pellman
Miller Stanley D.
Sharp Kabushiki Kaisha
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