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Liquid-crystal-spatial-light-modulator-with-electrically-isolated-reflecting-films-connected-to-electrically-isolated-pixel-portions-of-photo-conductor

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Details

Inventors: Takimoto, Akio; Tanaka, Yukio; Asayama, Junko; Akiyama, Koji; Kuratomi, Yasunori; Ogawa, Hisahito;
Assignee: Matsushita Electric Industrial Co., Ltd. (JP)
Primary Examiner: Gross; Anita Pellman
Assistant Examiner:
Attorney, Agent or Firm: Renner, Otto, Boisselle & Sklar

Pixel portions of a photoconductive layer each have a pin structure for providing a rectifying function and are substantially electrically isolated from one another by a highly resistant inter-pixel portion for preventing diffusion of electrical carriers. Data written into a liquid crystal layer by writing light is read out as an optical output by reading light. Reflecting films are provided on the pixel portions, respectively, and an output light blocking film is provided on the inter-pixel portion formed into a groove. The reflecting films and the output light blocking film are partially overlapped on each other so as to sufficiently block the reading light.

DETAILED DESCRIPTION A spatial light modulator according to the present invention includes a first electrode; a second electrode opposed to the first electrode; a photoconductive layer electrically connected to the first electrode and including a plurality of pixel portions and an inter-pixel portion between the pixel portions, the pixel portions being electrically isolated from one another by the inter-pixel portion; a plurality of reflecting films electrically connected to the pixel portions of the photoconductive layer respectively, the reflecting films being electrically isolated from one another; and a liquid crystal layer interposed between the reflecting films and the second electrode.
The pixel portions each have a rectifying function between the reflecting film connected thereto and the first electrode.
A method for producing a spatial light modulator according to the present invention includes the steps of laminating a plurality of layers to form a photoconductive layer having a diode structure; and selectively etching a specified area of at least one of the plurality of layers to obtain a plurality of pixel portions with no part thereof being etched and an inter-pixel portion for substantially electrically isolating the pixel portions from one another, the inter-pixel portion being obtained between the pixel portions.
Thus, the invention described herein makes possible the advantages of providing (1) a spatial light modulator for displaying a high density image at a high speed response, and a method for producing the same; and (2) a spatial light modulator having excellent blocking for reading light, for displaying an image having a high resolution and a satisfactory contrast ratio, and a method for producing the same.
These and other advantages of the present invention will become apparent to those skilled in the art upon reading and understanding the following detailed description with reference to the accompanying figures.

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