![]() With the compatible color encoding scheme originally developed by Georges Valensi in 1938, the color was changing continually along the line, which was far too fast for any sort of mechanical filter to follow. Black and white TVs used a continuous signal and the tube could be coated with an even deposit of phosphor. On color sets the signal would be extracted, decoded back into RGB, and displayed.Īlthough RCA's system had enormous benefits, it had not been successfully developed because it was difficult to produce the display tubes. Color information was then separately encoded and folded into the signal as a high-frequency modification to produce a composite video signal – on a black and white television this extra information would be seen as a slight randomization of the image intensity, but the limited resolution of existing sets made this invisible in practice. This was a major advantage over the mechanical systems being proposed by other groups. Luminance closely matched the black and white signal of existing broadcasts, allowing it to be displayed on existing televisions. This system did not directly encode or transmit the RGB signals instead it combined these colors into one overall brightness figure, the " luminance". RCA worked along different lines entirely, using the luminance-chrominance system. In spite of these problems, the United States Federal Communications Commission selected a sequential-frame 144 frame/s standard from CBS as their color broadcast in 1950. Another problem was that the mechanical filter made them flicker unless very high refresh rates were used. Because they broadcast separate signals for the different colors, all of these systems were incompatible with existing black and white sets. Most systems broadcast entire frames in sequence, with a colored filter (or " gel") that rotated in front of an otherwise conventional black and white television tube. At the time, a number of systems were being proposed that used separate red, green and blue signals (RGB), broadcast in succession. However, it was only in the late 1940s that it was perfected by both CBS and RCA. Close-up of phosphor bars on a 14" Sony Trinitron television History Color television A 1970s tabletop size TrinitronĬolor television had been demoed since the 1920s starting with John Logie Baird's system. The name Trinitron was derived from trinity, meaning the union of three, and tron from elec tron tube, after the way that the Trinitron combined the three separate electron guns of other CRT designs into one. Patent protection on the basic Trinitron design ran out in 1996, and it quickly faced a number of competitors at much lower prices. Constant improvement in the basic technology and attention to overall quality allowed Sony to charge a premium for Trinitron devices into the 1990s. One of the first television systems to enter the market since the 1950s. Trinitron was Sony's brand name for its line of aperture-grille-based CRTs used in television sets and computer monitors. ![]() ![]() ( Learn how and when to remove this template message) ![]() ( March 2023) ( Learn how and when to remove this template message) ![]() Please help improve it by removing promotional content and inappropriate external links, and by adding encyclopedic content written from a neutral point of view. This article contains content that is written like an advertisement. ![]()
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