| 摘要 |
<p>PURPOSE:To prevent contrast lowering and crosstalk of a picture due to spike- shaped voltage by providing electron beams to be emitted from an electron emitting element array with a modulation grid and timely impressing cut-off voltage. CONSTITUTION:A timing control circuit 103 changes the contents of output of a line memory 105 every one line synchronously with the serial picture data to be inputted into a shift register 104. On the other hand, aforesaid control circuit generates control signals to the switching element array 102 to drive in sequence, however generating spike--shaped impression voltage due to characteristic diversity of the switching elements S1 to Sm+1. There, by inputting cut-off timing signals to a gate array 106 ranging at least 100 n s, a modulation grid cuts-off needless electron beams by a modulation grid. Thereby, lowering of brightness contrast and crosstalk can perfectly be removed.</p> |
