日立公司中央研究实验室与国家广播公司共同进一步发展激光彩色放映。目前的行密度为每帧1125行,较过去高两倍。以氪激光器提供红光,氩激光器提供蓝光和绿光。 Hitachi Central Research Laboratory and the State Broadcasting Corporation to further develop the laser color screening. The current line density is 1125 lines per frame, twice as high as in the past. The krypton laser provides red light, the argon laser provides blue and green light.