In the early 90's, TV's started including low-resolution "Teletype" type chips (the kind you see overlay information on security cameras) that would generate menu text for volume control, etc.
Frequently these TV's would have a "muting" mechanism - if you selected a channel without a signal, it would mute the audio and display a blue background instead of the underlying signal.
When LCD TV's and HDTV started gaining traction the "No Signal" screen was often some text bouncing around in some manner.
Frequently these TV's would have a "muting" mechanism - if you selected a channel without a signal, it would mute the audio and display a blue background instead of the underlying signal.
When LCD TV's and HDTV started gaining traction the "No Signal" screen was often some text bouncing around in some manner.