| 摘要 |
<p>A cathode-ray tube, such as a color television picture tube of the feedback or sensing type including a viewing screen comprising an array of different color light-emitting phosphor strips, and indexing means comprising a periodic series of spaced indexing strip-like areas extending parallel to the phosphor strips. The elements of one of the indexing strip-like areas or the spaces therebetween alternate in width across the screen between two different values. The elements of the other of the indexing strip-like areas and the spaces therebetween are of substantially equal width. In operation, beam-produced control signals from the indexing strip-like areas are processed to produce a periodic signal wave, which is used to synchronize the application of color signals to the beam with the instantaneous position of the beam on the screen.</p> |
