Abstract: A display may include an array of pixels. A pixel can include an organic light-emitting diode, up to three thin-film transistors, and up to two capacitors. The pixel can include a drive transistor, an emission transistor, and a select transistor. The select transistor can be used to apply a reference voltage to the gate of the drive transistor during a global reset phase and during a global threshold voltage sampling phase and can also be used to apply a data voltage to the gate of the drive transistor during a data programming phase. The drive transistor can receive a power supply voltage that toggles between a low voltage during the global reset phase and a high voltage during other phases of operation. Configured and operated in this way, the pixel need not include separate dedicated anode reset and initialization transistors.

Abstract: A method for preparing a composite oxide having oxygen absorbing and desorbing capability involves the steps of: providing a starting composite oxide comprising cerium oxide, zirconium oxide, and hafnium oxide; subjecting the starting composite oxide to heating-deoxidation to give a deoxidized composite oxide; and subjecting the deoxidized composite oxide to heating-oxidation.

Abstract: A composite oxide having oxygen absorbing and desorbing capability contains 4.99-98.99% by weight of cerium oxide, 1-95% by weight of zirconium oxide and 0.01-20% by weight of hafnium oxide. The composite oxide includes .PHI.' phase as a crystal phase and has oxygen absorbing and desorbing capability of at least 100 .mu.mol/g at 400.degree. to 700.degree. C.