Multicolor Electrochromic DOT-Matrix Display Investigation
Abstract
The feasibility of multicolor electrochromic dot-matrix displays based on lutetium diphthalocyanine was investigated on the premise that integrated matrix drive electronics for such devices will become available in several years. A 3 x 3-inch display panel with switchable 5 x 7-dot characters was attractive and clearly legible at 24 lpi. Viewing was hardly impaired when a metal mesh overlay simulating the appearance of matrix drive circuitry was placed in registry with the dot pattern. Color resolution and memory were demonstrated for adjacent red/green, blue/green, and red/blue areas in the matrix. Current and charge transients were recorded for constant-voltage pulses applied to areas representing 2 to 16 dots. Time constants of 10 to 20 ms were typical of the green-to-red electrochromic transition. An effective capacitance of approximately 1000 microform/sq cm arose from the electrochemical reaction of the dye film. Also associated with that process was an area resistance, usually less than 25 ohms.sq cm. Further development of multicolor electrochromic dot-matrix displays is recommended. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Jun 01, 1980
- Accession Number
- ADA085453
Entities
People
- F. A. Pizzarello
- M. M. Nicholson
- T. J. La Chapelle