A vintage cathode ray tube contains no physical grid of digital pixels. Inside the vacuum tube, an electron gun fires a continuous beam across a glass face coated with rare-earth phosphors. Guided by magnetic deflection yokes, this beam sweeps horizontally from left to right, line by line, painting an analog luminance waveform.
Consoles like the Sega Genesis, Super Nintendo, and Sony PlayStation outputted a non-standard timing trick known as 240p resolution. Instead of alternating odd and even fields to compose a standard 480i television broadcast, the consoles instructed the electron gun to re-trace over the exact same 240 horizontal scan paths sixty times per second. The unpainted lines between these sweeps formed empty, dark gaps. This scanline rendering eliminated interlace flicker and produced high-contrast visual separation.
Because the electron beam traveled horizontally as a continuous wave, horizontal detail was governed by analog bandwidth, not fixed boundaries. The light emitted by struck phosphors did not shut off instantly; it bloomed outward in a soft Gaussian distribution, overlapping adjacent points along the scanline. A single point of light on a tube TV possessed a luminous halo that softened transitions while preserving razor-sharp vertical focus.
