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【资源】磁矩阵的设计和分析/美/博士论文Design And Analysis Of ........
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Design And Analysis Of The Magnetic Matrix Display. Andrew R. Knox. A thesis presented to the University of Glasgow Faculty of Engineering in partial fulfilment of the requirements for the degree of Doctor of Philosophy. November 2000. University of Glasgow, Department of Electronics and Electrical Engineering. Rankine Building, Glasgow, G12 8QQ. Scotland, U.K. IBM (UK) Ltd, Advanced Displays Technology, Development Laboratory. Spango Valley, Greenock, PA16 0AH. Scotland, U.K. Abstract A matrix addressed flat CRT using an area cathode and high voltage phosphors is presented. The display uses a permanent magnet that is perforated to provide an aperture for each pixel. Beam current modulation is by the use of a pair of orthogonal grids deposited on the side of the magnet facing the area cathode. Primary colour subpixel selection is by an electrostatic micro indexing structure deposited on the side of the magnet facing the phosphors. Electron beam path length is of the order of 7mm. To facilitate design of the display a stochastic model for simulating the behaviour of a thermionic cathode has been developed that takes into account the angular distribution and thermal velocity spread of the emitted electrons and does not rely on problem geometry in its formulation. In conjunction with a Finite Element space charge solver, electron beam formation and modulation may be examined by the use of particles traced from an electron emission surface that has a fixed work function and temperature. Techniques to reduce the number of particles required to represent the emission current whilst retaining a very fine resolution with high dynamic range of beam current are presented and assessed. The emission model uses an independent random selection of particle positions, directions and velocities from the computed cathode properties and the effects of this selection process on model performance and ergodicity are explored in detail. Comparisons between the approach adopted and conventional deterministic methods are made and indicate the new model may offer an order of magnitude reduction in the number of particles required to represent the emission properties. Further comparisons are made in the requirements the emission model imposes on the discretisation of the solution domain in order to properly represent the potential barrier formed by a space charge limited thermionic cathode. The model is applied in evaluation of a remote virtual cathode system for use with the display using thermionic filament cathodes. A comparison of the expected pixel beam current density profile between the previous and new models is also made and conclusions drawn about the effectiveness of the approach taken. The effects of electron lens aberrations on the beams and on the cathode system selected for use with the display are discussed in detail. 下载地址： http://d.namipan.com/sd/901008 不要金币的啊。 [ Last edited by zhousatan on 2009-9-26 at 00:41 ] |
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