Browse Prior Art Database

Color Display Device

IP.com Disclosure Number: IPCOM000086362D
Original Publication Date: 1976-Aug-01
Included in the Prior Art Database: 2005-Mar-03
Document File: 2 page(s) / 24K

Publishing Venue

IBM

Related People

Axford, JG: AUTHOR [+2]

Abstract

This color display operates by selectively reflecting incident light from interference filters thereby generating selected colors. The display consists of a sheet of glass 1, on the underside of which are thin layers 2 of transparent material of different refractive index to the glass. The combination of glass 1 and layer 2 forms a conventional interference filter, different colors being produced according to the thickness of the layer 2. An interference filter is activated by the plating out on the underside of layer 2, reflective material 3 from an electrolyte 4.

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Color Display Device

This color display operates by selectively reflecting incident light from interference filters thereby generating selected colors. The display consists of a sheet of glass 1, on the underside of which are thin layers 2 of transparent material of different refractive index to the glass. The combination of glass 1 and layer 2 forms a conventional interference filter, different colors being produced according to the thickness of the layer 2. An interference filter is activated by the plating out on the underside of layer 2, reflective material 3 from an electrolyte 4.

Layer 2 is 150-75 nm for the production of blue light and 240-120 nm for red light. The filters can be arranged in conventional triads (Fig. 2) producing the three primary colors red, blue, green, or in strips. The electrolyte 4 or the bottom surface 5 of the device is preferably dark to provide contrast.

If the material of the layers 2 is sufficiently conductive these are used as electrodes, otherwise a thin transparent conductive layer (~20nm) is provided on the underside of the layers. Drive current is supplied from the surface 5 with the filters held at a reference potential.

Observed color will vary with angle of incidence but relative color discrimination will be invariant. Preferably, layer 2 should have a greater refractive index than the glass 1.

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