A high-performance digital convergence and focus system for projection TV

Buttar, Avtar Singh; Jobling, D.; Rusznyak, A.; Gieim, G.; Heizrnann, F.

doi:10.1109/30.156762

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1993

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The poly-phase shift filter for a time-shared DAC in a digital convergence system

Nam

Kwak

Jung

et al.

IEEE Workshop on Signal Processing Systems

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A digital CRT convergence control system usually employs an independent digital-to-analog converter (DAC) for each Red, Green and Blue signals. If the DAC is time-shared among R, G and B signals, the complexity and the size of hardware can be much reduced. However, sharing of the DAC introduces a time-delay among control signals, resulting in a misconvergence and a poor picture quality in projection TV. This paper proposes a digital convergence system that employs poly-phase shift filters to eliminate the time-delay problem in a time-shared DAC. The proposed system got a patent and has been successfully implemented in ASIC, and is currently used in commercial production o f projection TV.0-7803-7587-4/02/$17.00 02002 IEEE

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