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US 6,337,695 B1Granted
Circuit for controlling a contrast level and compensating a brightness level of a video display apparatus and method therefor
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A circuit for compensating a brightness level of a video display apparatus capable of simplifying a circuit configuration and reducing a cost of production by placing a brightness level compensation circuit for the video display apparatus is disclosed. Microprocessor memorizes a predetermined data for a brightness level compensation and outputs a data signal and a clock signal based on the data for the brightness level compensation. Video pre-amplifier receives a video signal and horizontal and vertical fly-back pulse signals from an outside and controls a contrast level and compensates a brightness level of the video signal in accordance with the data signal and the clock signal to output a compensated video signal. Accordingly, the design of the brightness level compensation circuit is simplified and the size of the printed circuit board is reduced. In addition, the cost of production decreases and the productivity of products increases by reducing a number of components of the brightness level compensation circuit.
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