| 摘要 |
The invention provides a circuit for controlling a cathode ray tube. The circuit comprises a source of input colour signals (Uin(R), Uin(G), Uin(B)) for the primary colours of the cathode ray tube. Output amplifiers are coupled to the source of colour input signals and to electron guns of the cathode ray tube. Finally, limiting means are provided to limit the colour input signals to a predetermined threshold value. In this way the output amplifiers are prevented from saturation and undesirable smears do not appear on the screen. In an advantageous embodiment the limiting means are realized by a diode biased in reverse direction. <IMAGE> |
