| 摘要 |
<p>PURPOSE: A circuit for automatically selecting a video input level is provided to automatically select a video level without a user's specific adjustment by comparing an R,G,B signal inputted with a reference voltage through a comparator, by adjusting an input gain level in a level control unit. CONSTITUTION: A video signal output unit(16) processes a video signal inputted from a PC. A pre-amplifier(17) amplifies and outputs an R,G,B signal outputted. A video output unit(18) outputs the R,G,B signal amplified and outputted from the pre-amplifier(17). A signal comparison unit(20) compares the R,G,B signal with a reference voltage. A level discrimination unit(30) discriminates a level of the R,G,B signal. A level control unit(40) adjusts an input gain level of the R,G,B signal. A contrast adjustment unit(50) outputs a contrast electric potential.</p> |
