Image screen adjustment apparatus for video monitor

摘要

A control apparatus adapted to adjust the image screen display characteristics of a video monitor. The apparatus comprises a microprocessor, an encoder, and a rotary input signal processor. The microprocessor implements operation and adjustment control of the monitor. The encoder provides a rotary knob that a user of the monitor device may rotate in either direction for generating a pair of pulse signals. The rotary input signal processor is coupled between the microprocessor and the encoder for receiving the pair of pulse signals generated by the encoder and reshaping the pulses for input to the microprocessor. The microprocessor receives the reshaped pulse signals to determine the direction of rotation and the range of rotation of the encoder. The determined direction and speed of rotation are utilized as the basis for the adjustment of the image screen of the video monitor device. The microprocessor further determines the speed of rotation of the encoder utilizing the received reshaped pulse signals for adjusting the image screen. The image screen is adjusted in a manner corresponding to the determined speed of rotation of the encoder wherein a faster rotation corresponds to faster image screen adjustment.