Method and apparatus for making corrections in a video monitor

摘要

A circuit within a video monitor (12) for making corrections during horizontal scan includes a data storage device (42) containing information relating to a selected display parameter, an integrator (46) receptive to the stored information and adapted to produce an integrated signal therefor, and an amplifier receptive to the integrated signal for supplying signals to the video monitor based on the integrated signal. The information supplied from the data storage device to the integrator is encoded in a pulse density modulated waveform via a tri-state gate and a one-shot timer. Also, an on-screen display chip uses stored fonts to generate a pulse-density modulated signal. Gradients between rows of fonts can be generated using selected fonts from a font gradient table, or can be produced using an up-down counter. Gain matrix tables are also disclosed within the vision system to aid the vision system in predicted proper alignment of less intelligent monitors.