Young Sun Na

42.2: 1.8-inch Full-Color OEL Display for IMT2000 Terminals

We have developed the 1.8-inch 128(×RGB)×160 full-color passive matrix organic electro-luminescent display (PMOELD) for IMT-2000 terminals and its driver chipset. A PWM (Pulse Width Modulated) current-controlled gray scale method with a new pre-charging architecture, which considers the power limitation of the battery-operated systems, has been proposed for the accurate gray scale with securing safe operation. The measured results show that the proposed gray scale method has the merits of linear gray scale realization and over 15% power saving effect in comparison with the conventional method.

Silicon‐based 0.69‐inch AMOEL microdisplay with integrated driver circuits

Abstract Silicon‐based 0.69‐inch AMOEL microdisplay with integrated driver and timing controller circuits for microdisplay applications has been developed using 0.35 μm 1‐poly 4‐metal standard CMOS process with 5 V CMOS devices and CMP (Chemical Mechanical Polishing) technology. To reduce the large data programming time consumed in a conventional current programming pixel circuit technique and to achieve uniform display, de‐amplifying current mirror pixel circuit and the current‐mode data driver circuit with threshold roltage compensation are proposed. The proposed current‐mode data driver circuit is inherently immune to the ground‐bouncing effect. The Monte‐Carlo simulation results show that the proposed current‐mode data driver circuit has channel‐to‐channel non‐uniformity of less than ±0.6 LSB under ±70 mV threshold voltage variaions for both NMOS and PMOS transistors, which gives very good display uniformity.