A human performance experiment was conducted to investigate pixel parameter requirements for three types of flat-panel display images: an alphanumeric character, an oscilloscope waveform, and a real-world image. Subjects performed similarity judgments between an extremely high-quality image and an image composed of different levels of anti-aliasing and pixel width-plus-pixel separation (pitch). It was found that the effect of pitch had greater influence on perceived image quality for the alphanumeric character and oscilloscope waveform than for the real-world image. The results of this research provide empirical evidence showirg that the pixel pitch requirements for flat-panel systems that are used to display binary, high-contrast images (such as text and waveforms) will be more stringent than for low-contrast pictorial images. The three levels of grey-scale anti-aliasing investigated were found to improve image quality for only the binary, high-contrast images.

The accomplishments presented in this thesis are the development of three models for simulation of space charge generation in the phosphor layer of alternating current thin-film electroluminescent (ACTFEL) devices and the results from simulation of these models. First, a single sheet charge model is developed and simulated. The single sheet charge model is a model that simplifies the problem of modeling an arbitrary distribution of space charge across the phosphor layer by lumping all of the space charge into a sheet of charge at a specified location in the phosphor layer. In this model and all subsequent models, space charge creation is assumed to occur by field emission from bulk traps or by impact ionization of deep-level traps. A fairly exhaustive parametric variation study of the single sheet charge model is performed and the results are presented and discussed. The results show space charge effects that are quite dependent on several parameters such as the number of bulk traps in the phosphor layer, the location of the sheet of charge, the capture efficiency for space charge annihilation, and the characteristic field for impact ionization of the deep-level traps. The second model considered is a logical extension of the single sheet charge model, the two sheet charge model, which models the space charge distribution as two sheets of charge rather than one. This model has potential application in the simulation of ACTFEL devices which exhibit large and/or symmetrical space charge effects. The final model developed is an equivalent circuit/SPICE model of the single sheet charge model. Actually, two models are developed, one for space charge creation by field emission and one for impact ionization of deep-levels. Two SPICE models are required because of functional differences in the dependencies of space charge creation. The results of a simulation showing overshoot generated by SPICE are given for the field emission equivalent circuit. / Graduation date: 1996

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Thesis (Ph.D.) -- McMaster University, 1999. / Includes bibliographical references (leaves 98-103). Also available via World Wide Web.

Thesis (Ph.D.)--McMaster University (Canada), 1991. / Source: Dissertation Abstracts International, Volume: 54-02, Section: B, page: 1040.

Thesis (M.S.)--Oregon State University, 1992. / Typescript (photocopy). Includes bibliographical references (leaves 82-85). Also available on the World Wide Web.