Alternating-current thin-film electroluminescent (ACTFEL) devices are used in the
formation of pixels in flat panel displays. ACTFEL flat panel displays have many
advantages over other flat panel technologies. Specifically, ACTFEL panels are emissive
displays, they have high brightness, wide viewing angles, and rugged construction.
Although much is already known about the operation of ACTFEL devices, several topics
related to the device physics and modeling of these devices require further research.
In this work, existing ACTFEL device models are refined by expanding the
understanding of ACTFEL device physics and operation. Modeling is separated into three
levels of increasing complexity as follows; (1) equivalent circuit modeling, (2) device
physics or electrostatic modeling, or (3) Monte Carlo modeling. Each level of model is
addressed in this thesis. Existing equivalent circuit models are empirically refined to
account for device response to variations in the shape of the driving waveform pulse. The
device physics model is expanded by presenting evidence for the formation of space
charge in the phosphor layer and the equations prescribing device response are modified
accordingly. Also, a new technique for measuring the distribution of interface states in
ACTFEL devices is presented. This gives new insight into device operation, as the
interface state distribution is one of the most difficult parameters to estimate/measure in
the device physics model. Finally, an experiment is presented which attempts to measure
the maximum energy of hot electrons during conduction in the phosphor. This research
leads to a recommendation of the complexity of the conduction band model needed for
accurate Monte Carlo simulation of ACTFEL devices. / Graduation date: 1993
| Identifer | oai:union.ndltd.org:ORGSU/oai:ir.library.oregonstate.edu:1957/36463 |
| Date | 27 April 1993 |
| Creators | Douglas, Allan A. |
| Contributors | Wager, John F. |
| Source Sets | Oregon State University |
| Language | en_US |
| Detected Language | English |
| Type | Thesis/Dissertation |
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