Full-color displays of passive-matrix driven organic electroluminescence panels

2.2 inch diagonal full-color passive-matrix displays of organic electroluminescence panels were fabricated, and the possibility of mass production was examined. The panel consisted of 132 x 162 pixels, and each pixel had three subpixels of red, green and blue emission in line. The panel contained stripe-shaped ITO lines, multi layers of organic materials, and cathode lines orthogonal to ITO lines. The organic layers of the electroluminescence panels were fabricated by vacuum evaporation method. Full-color emission was performed by patterning directly the emitting layers of red, green and blue color through metal mask in order to take most advantage of the luminous efficiency of electroluminescence. Pixel size of 0.272 mm x 0.264 mm was performed by vacuum evaporation using metal mask. This simple-structured panel was driven with passive matrix drive method. Dual scan drive method was adopted to lower the duty ratio, which made the peak luminance lower. Total thickness of the module was only 2.5 mm. We started pilot production of the 2.2 inch diagonal full-color organic electroluminescence panels, and good manufacturability is promised.