ors have exceptional performance for polymers and meet all the requirements for addressing displays. Along with a high mobility, they have very low leakage and good stability. PAPER-LIKE VIDEO DISPLAYS There is much more involved in the fabrication of a low-cost transistor array than just printing the polymer semiconductor. As with any integrated elec- tronic device, metals and insulators must also be deposited and patterned into a multi-layer structure having the right electronic circuit and an appropriate physical size. The PARC scientists have successfully integrated the jet-printed polymer into a prototype display circuit, in which printing techniques define all the patterns. The electronic properties and physical dimensions meet the needs of flat-panel displays, and the complete absence of photolithography promises low-cost manufacture. The PARC array design also solves key issues of unwanted interactions between pixels of the display, accurate layer-to-layer alignment, and materials compatibility. Although much more development is needed to make the jet-printed organic semiconductor display process ready for manufacture, this break- through demonstration at PARC represents proof that it can be done successfully. 9.9.4 Quantum Displays Massachusetts Institute of Technology (MIT) researchers have developed a new display technology that promises to someday replace conventional LCDs. The technology-a quantum dot-organic light-emitting device (QD-OLED)- allows the creation of flat-panel screens that consume less power and produce better images than existing counterparts. Based on high-performing inorganic nanocrystals-combined with organic materials-QD-OLEDs would be ideal for use in mobile devices. Unlike tra- ditional LCDs, which must be lit from behind, quantum dots generate their own light. Depending on their size, the dots can be "tuned" to emit any color in the rainbow. Better yet, the colors they produce are highly saturated, per- mitting richer, more lifelike images. Also known as "artificial atoms," qua