When electronics became more advanced, it became clear that adding some extra devices for an OSD was cheaper than adding a second display device. Including this display increased manufacturing costs. They needed an external display, which was LED, LCD, or VFD based.
After remote controls were invented, digital adjustments became common. This was used more recently also in monochrome portable TVs. In the past, most adjustments on TV sets were performed with analog controls such as potentiometers and switches.
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