Attiganal Narayanaswamy Sreeram

31.2: Fabrication of 165 μm Pitched PDP Back Panel Based on LTCC‐M Technology

Orion Electric Co. has developed an XGA resolution, 165 μm pitch 25″ Plasma Display Back Panel by combining the process and cost benefits of the LTCC-M (Low Temperature Co-fired Ceramic on Metal) substrate technology with a high-resolution one-step “Barrier Embossing” technique. Tensile tests on green sheets were conducted and the effects of green sheet mechanical properties on embossed barrier height were investigated. LTCCM back panels (8″) were sealed to sodalime glass front panels and the assembled parts were successfully evacuated to 10−7 torr without cracks on the glass side.

Integration of electroluminescent displays on multilayer ceramic-on-metal circuit boards for application in military vehicles

Display system requirements for deployment in military vehicles are very demanding. Multilayer ceramic-on-metal circuit board technology is being applied to enable the fabrication of electroluminescent displays with enhanced performance, ruggedness, and functionality. The circuit board is utilized as the display substrate. The metal core of the circuit board provides a highly rugged panel with excellent thermal dissipation. Display packaging is simplified and display system size and weight are reduced by integrating drivers onto the display. This approach enables increases in display brightness by addressing the EL display in multiple segments with conductive vias through the circuit board. System cost is reduced by eliminating flex-cable edge connectors and by simplifying the package. Display functionality can be extended by integrating related electronics onto the display panel. Monochrome display samples have been demonstrated with performance similar to samples fabricated on traditional glass substrates. Current efforts are directed toward demonstrating high-performance color EL, utilizing the ability of the ceramic substrates to accommodate high-temperature phosphor annealing required to fully activate blue phosphors.