| 摘要 |
PURPOSE:To recognize a slight change of control quantity, by providing a horizontal display region containing different colors at right and left sides to a picture receiving screen, showing the size and the margin of the control quantity by the lengths of the left and right sides of said display region and furthermore by providing a slit to the display region. CONSTITUTION:The output signals of AND circuits 29 and 30 are impressed to a proper one of red, green and blue video output circuits via a color designating circuit 37 which is controlled by color designating signals Dvol and Dbri, etc. of a control IC. Then a display region of a color corresponding to the control subject is formed on the screen of a TV receiver. Thus it is possible to show the size and the margin of control quantity by the lengths of one side and the other side respectively. At the same time, a slit is formed at the display region by a slit forming signal producing circuit 33. Thus it is possible to observe the boundary position between two parts of different colors of the display region in comparison with the slit. Therefore the delicate position of the boundary can be known, and it is possible to know a slight change of the control quantity. |
