BISTABLE EL PANEL STUDY.
Abstract
The study was performed to determine the most feasible method to incorporate semiconductor integrated circuits into an electroluminescent display panel to control the EL lamps and to provide memory. A basic circuit was developed that consists of a high voltage, silicon-controlled rectifier (SCR) to control the EL lamp, and a low-voltage SCR to provide the memory. The memory circuit can be turned ON or OFF by application of coincident X and Y selection pulses of the proper polarity; thus, many such circuits can be connected in a rectangular matrix to facilitate addressing the elements in a large panel. The performance objectives for this study included an ON brightness of 20 foot lamberts, a contrast ratio of at least 20:1 between ON and OFF elements, resolution of at least 8 elements per inch, and the capability for expansion to a large-area display consisting of 1,000,000 elements. Specific studies were conducted to determine the suitability of oxide-isolation techniques to provide circuit isolation, and it was determined that this method, while feasible, would be more costly than other available methods, such as beam-leading. A technique was developed that allows electrical contacts to be soldered directly to the rear electrode of an electroluminescent lamp. A high-voltage, low-leakage SCR (less than 3 microamperes RMS at 250 volts RMS) was designed and used successfully in a breadboard-model display consisting of one-hundred elements. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Oct 01, 1966
- Accession Number
- AD0802125
Entities
People
- Frank Macey
- Robert L Barry
- Rosario Cushera
- S. Novak
- Sidney Johnson
Organizations
- Sylvania Electric Products