The original flat screen television had a bent cathode ray tube with an electron gun projecting to one side. A transparent electrostatically-charged plate is used to reflect the beam at right angles to its original path, enabling sets to be made thinner than the older design of CRT. The wall screen version consists of four tubes joined together with the electron guns projecting above and below the screens, doubling the resolution in both dimensions. The smaller, single-gun form is still used for computer displays. In the second decade of the Caroline Era, additional innovations enabled the tubes to be made flatter.
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