Browse Prior Art Database

High Resolution Display Device

IP.com Disclosure Number: IPCOM000087047D
Original Publication Date: 1976-Dec-01
Included in the Prior Art Database: 2005-Mar-03
Document File: 3 page(s) / 51K

Publishing Venue

IBM

Related People

Gamblin, RL: AUTHOR [+2]

Abstract

This high-resolution display device utilizes a layered photoconductor. In Fig. 1 the layered photoconductor comprises a charge-generation layer 10 and an elastomeric charge-transporting layer 12. Bonded to the bottom of the photoconductor is a thin layer of aluminum 14 or other conductive metal sufficiently thin as to be transparent. A transparent substrate 16 supports the structure, which substrate might consist of glass or MYLAR*. The top of the layered photoconductor is covered by an optical interference layer 18.

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High Resolution Display Device

This high-resolution display device utilizes a layered photoconductor. In Fig. 1 the layered photoconductor comprises a charge-generation layer 10 and an elastomeric charge-transporting layer 12. Bonded to the bottom of the photoconductor is a thin layer of aluminum 14 or other conductive metal sufficiently thin as to be transparent. A transparent substrate 16 supports the structure, which substrate might consist of glass or MYLAR*. The top of the layered photoconductor is covered by an optical interference layer 18.

The charge-generating layer might consist of squarylium dyes, chlorodiane blue, selenium tellurium, certain of the phthalocyanine dyes or other such materials. The transporting layer 12 would use an elastomeric material as a binder which would be doped with any material having a high hole mobility such as 1-phenyl-3(p-diethylaminostyryl)-5 (p-diethylaminophenyl)-pyrazoline.

The operation of the display device will now be discussed with reference to both Figs. 1 and 2. Initially, the upper surface or the surface of layer 18 in Fig. 1 is given a uniform negative static charge, for example, by passing a charge corona over the surface. Thereafter, an image source 20 writes on the display device 22 by shining light through the transparent substrate 16 and transparent conductive layer 14 to the charge-generation layer 10. Where light strikes the charge-generation layer 10, charges are generated and flow through the transport ' layer 12 to discharge the upper surface of the display device 22. The image source may be a projected image flash exposed, a scanned image or a laser written image.

With an electrostatic image now on the upper surface of the display device 22, the elastomeric material in the transporting layer 12 will deform in accordance with the charge on the surface. Those areas of the surface not discharged by the light image will remain flat while those areas which were discharged by the light image will become corrugated. Accordingly, the image on the upper surface of the display device 22 may be read out by shining light from light sourc...