These two passive matrix OLED (organic light emitting diode) display modules offer 256RGBx64 dot pixel resolution. The OLED modules provide an efficient and economical emissive display capable of a wide variety of animations, patterns, and backgrounds for use in medical diagnostic instrumentation. Available in full-color and monochrome versions, the OLED modules provide active viewing areas of 2.9-inch and 3.2-inch diagonal, respectively, and require no backlight.