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Photoconductor Electrochromic Element for Laser Beam Addressable Display

IP.com Disclosure Number: IPCOM000087633D
Original Publication Date: 1977-Feb-01
Included in the Prior Art Database: 2005-Mar-03
Document File: 2 page(s) / 54K

Publishing Venue

IBM

Related People

Melz, PJ: AUTHOR

Abstract

A photoconductor/electrochromic display is illustrated in Fig. 1 and 2. The device 10 has a pair of transparent conducting electrodes 12 and 14 positioned on glass or equivalent transparent substrates 16 and 18, respectively. Positioned between the electrodes 12 and 14 is a photoconductor 20, an interfacial layer 22 and an electrochemical layer 24.

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Photoconductor Electrochromic Element for Laser Beam Addressable Display

A photoconductor/electrochromic display is illustrated in Fig. 1 and 2. The device 10 has a pair of transparent conducting electrodes 12 and 14 positioned on glass or equivalent transparent substrates 16 and 18, respectively. Positioned between the electrodes 12 and 14 is a photoconductor 20, an interfacial layer 22 and an electrochemical layer 24.

The interfacial layer 22 (Fig. 2) consists of a dielectric mirror 26 having a plurality of metal inserts 28 penetrating the mirror. example of an interfacial layer for a two-inch square cell suitable for use with a projection display would consist of a 1000 x 1000 array of spots on two mil centers. The interfacial layer provides one dimensional conductivity and has one total surface reflecting. The interfacial layer optically isolates the photoconductor from either the ambient lighting or the projection illumination (32 shown in Fig. 1), and simultaneously provides DC electrical contact between the photoconductor and electrochromic layer. It is desirable for the interfacial layer to have high diffuse reflectivity for the direct view configuration and high specular reflectivity for the projection mode. The interfacial layer must have good DC conductivity normal to its surface, but at the same time it must have poor conductivity parallel to the surface in order to obtain the desired resolution.

In operation, the laser beam 30 writes information onto...