3.2: Digital Drive with White OLEDs

Abstract

2T1C digital drive has been investigated with stable white OLEDs. A 2.5″ QVGA digital drive AMOLED prototype exhibited quite stable lifetime under constant voltage stress. The lifetime (T50) of an OLED device with 40% aperture ratio was over 5,000 h at an initial condition of 442 cd/m2 while the T50 at an initial condition of 175 cd/m2 is estimated to be over 20,000 h even under constant voltage stress. Motion artifacts are also improved with an automatic refresh rate conversion with less impact on power consumption.

45.1: Invited Paper: Commercialization of World's First all‐phosphorescent OLED Product for Lighting Application

“…Though before Tang's paper, OLED used to require very high voltage for emission like more than 100V, state-of-art OLED device has very high luminous efficacy enough to be used for various displays including television [3] and even for cellular phone displays, which requires very low power consumption. [4] The luminous efficacy was improved enough for OLED displays to compete with other technologies. However, for lighting application, the luminous efficacy requirement is more stringent, especially when energy saving is stressed these days.…”

Paper No P6: Feasibility Study of Digital Driving for AMOLED Displays

“…Due to digital driving some temporal artifacts like dynamic false contour might occur especially for moving images . They could not be investigated yet by using the current test setup.…”

Principle and validation of digital driving for active matrix organic light emitting diodes displays

“…This leads to artificial dark or bright lines appearing in the image. The topic of false contouring can be resolved using very high frame rates as presented by Kawabe et al . This has the disadvantage that dynamic power loss increases.…”