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为使电视接收机小形化,必须做到电器元件小形化。使显象管的厚度减小的同时,又要显象面大,为此人们发明了大偏转角显象管。然而大偏转角显象管的管长限于显象面对角线长度的50～60％。把显象管的厚度作得更薄就成为扁平显象管,它的长度应叫厚度,只及显象面对角线长度的10～25％。 显象管的扁平化有两种:用电子束偏转并扫描的扁平显象管和半导体的平板显示。在这里就前者给于叙述。
In order to make the TV receiver small, it is necessary to make the electrical components smaller. So that the thickness of the CRT decreases at the same time, but also to display a large surface, for which people invented a large deflection angle tube. However, the tube length of a large deflection yoke is limited to 50 to 60% of the diagonal length of the display surface. To make the thickness of the CRT thinner becomes a flat CRT, its length should be called the thickness of only 10 ~ 25% of the diagonal length of the imaging plane. There are two types of flattening of the picture tube: a flat display tube deflected and scanned with an electron beam and a flat panel display of a semiconductor. Here for the former to narrate.