1985 March 17

At the Tsukuba Science Expo held in Japan, a super-large screen color TV wall built by Sony was unveiled. It is located in the central square, 40 meters long and 25 meters high, with an area of 1000 square meters. The whole building is as high as 14 floors. It is equivalent to a 1857 inch color TV. The super-large screen consists of 36 large luminous screens, each weighing 1 ton and being1.8m thick. 4 rows, 9 works, 450,000 color luminous elements. Through the camera installed at the top, you can show all kinds of activities at the venue at any time and play all kinds of advertising videos of Sony. 199 1 year165438+1October 25th.

The HDTV of Sony Corporation of Japan started trial broadcasting: its scanning line is 1 125, which is twice as much as the current 525, and the picture quality is improved by100%; The aspect ratio of the picture is changed from the traditional 9: 12 to 9: 16, which enhances the audience's sense of presence; The viewing angle of the tablet machine is extended from 10 to 30 degrees, which makes the map feel deeper; The "pixel" of TV has increased from 280,000 to 6.5438+0.27 million, and the amount of information per unit area has increased by nearly four times ... So the distance to watch HDTV is not seven times that of the screen in the past, but three times, and the sound is realistic, and the four-channel high-fidelity stereo is infectious.