| 摘要 |
A television receiver in which a plurality of picture-displaying fluorescent lines (3), which are disposed on a screen (2) as the display surface of a cathode ray-tube so as to extend generally in the horizontal direction (in the direction of the arrow X) as the beam main-scanning direction, and generally in the vertical direction (in the direction of the arrow Y) as the beam sub-scanning direction, and a single electron beam is arranged to scan across the screen (2) to display a picture. The television receiver has two kinds of beam detection stripes (5A), (5B) disposed in each guard band portion between adjacent fluorescent lines (3) so as to be parallel to the fluorescent lines (3). On the basis of beam detection signals independently taken from the beam detection stripes (5A), (5B) in correspondence to beam spots (S) of the electorn beam on the screen (2), the vertical positions (in the direction of the arrow Y) of the electron beam spots (S) with respect to the fluorescent lines (3) are controlled. For the beam detections stripes, it is possible to employ index fluorescent stripes employing two kinds of fluorescent substances or a pair of comb electrodes. |
