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电视的任务是将光的景象转换成电信号,经过传输,在别处即时显现原来的景象.早在十九世纪(约1875年)人们就开始进行这方面的探索工作,并在十九世纪末实现了有线机械电视.到本世纪二十年代,发展到无线机械电视,并逐渐向电子电视方面过渡.初期的电视质量是很差的,第二次世界大战结束后,电子技术有了较大的进展,黑白电子电视也发展到比较完善的地步.到1950年后,人们又发明了彩色电视,但是直到现在彩色电视系统的结构仍很复杂,价格昂贵,因此还不能普及,尚有待于进一步的研究和改进.
The task of the television was to convert the scene of light into an electrical signal which, when transmitted, immediately visualized the scene elsewhere, and as early as the nineteenth century (circa 1875), people began to carry out exploration work in this area and realized it by the end of the nineteenth century Cable mechanical television .Twenty years of this century, the development of wireless mechanical television, and gradually transition to the electronic TV. The initial television quality is very poor, after the end of World War II, electronic technology has a larger Progress, black and white electronic television has also developed to a more perfect point .5050 people invented the color TV, but until now the color television system is still very complicated and expensive, so it is not yet universal, yet to be further Research and improvement.