Full color and monochrome passive-matrix polymer light-emitting diodes flat panel displays made with solution processes

1.5 in. diagonal red, green, and blue monochrome passive-matrix (PM) polymer light-emitting diodes (PLED) flat panel displays (FPDs) with format 96 × 64 were fabricated by spin-coating technology with device structure of ITO/PEDOT/Emissive layer/Ba/Al. During spin-coating process, by rearranging the location and the direction of the panel with respect to the center of the spinner, the piling of organic materials under the cathode separator was significantly reduced, resulting in a more uniform light emission. The final display showed neither dead pixels nor dead lines. Current efficiencies of 1.37, 9.5 and 1.44 cd/A, and CIE color coordinates of (0.62, 0.37), (0.37, 0.60) and (0.15, 0.13), for red, green, and blue monochrome displays, respectively, have been achieved. Further, 1.5 in. full color PM PLED FPDs with format 96 × RGB × 64 was successfully fabricated by inkjet printing technology. The current efficiency was about 0.75 cd/A at full screen white with color coordinates located at (0.34, 0.35). A color gamut of 50% NTSC was obtained. For all the displays, the 5-point uniformity was more than 80%.