| 摘要 |
<p>A display apparatus including a modular type display tube (10) having a cathodoluminescent screen (16) an elongate thermionic or P-N electron emitter (22), a channel plate electron multiplier (38) and an apertured control plate (30) between the emitter (22) and the multiplier (38).</p><p>The control plate (30) has a plurality of switching electrodes (34) on the side facing the emitter (22) and a set of brightness electrodes (36) on the opposite side and extending transverse to the switching electrodes (34). In order to compensate for the variations in emission from the emitters, the brightness voltage to the brightness electrodes is turned-off and the emission is measured by scanning using the switching electrodes, a correction voltage is computed and is applied together with the modulation signal in synchronism with the scanning of the switching electrodes (34). An apertured shielding plate (28) is provided to avoid the switching voltages from the switching electrodes (34) from affecting the emissions from the emitters (22).</p> |
