| 摘要 |
Direct-current light-emitting panels and plasma displays require a constant-current power supply in order to be able to operate optimally. According to the invention, a current mirror 19 is used which constitutes a constant-current source for a column excitation circuit 7 which produces constant-current signals making it possible to excite column electrodes of a light-emitting panel or of a plasma display 1. The column excitation circuit initially therefore produces 55 a precharge current pulse in addition to a constant-current signal so as rapidly to charge the excited image elements up to a voltage which will allow lighting of the image elements under the required constant current and to a desirable, relatively high excitation frequency of the complete images. These constant-current excitation signals reduce the power dissipation in the display and thus make it possible to increase the lifespan of the latter. <IMAGE> |
