MONITOR INSPECTING CIRCUIT AND MONITOR INCLUDING INSPECTING CIRCUIT

PURPOSE:To provide a monitor inspecting circuit to be built in a monitor by reducing data quantity at the time of inspecting the monitor and simplifying the constitution of the circuit. CONSTITUTION:This monitor inspecting circuit consists of an H generating part 1, a V generating part 2 and a data generating part 3 and the data generating part 3 is constituted of a data part 4, a level data part 6 and a selector 5. The H and V generating parts 1, 2 respectively generates synchronizing signals to be outputted to the monitor. The data part 4 generates gradation data to be a reference and the level data part 6 outputs level data for determining a level to be displayed on the monitor. The selector 5 switches signals outputted from the data part 4 and the level data part 6 based upon a horizontal synchronizing signal H outputted from the H generating part 1 and outputs selected data to the monitor.