Or an analog signal and you do it the way TVs used to do. There were analog HDTV standards before we all moved to digital.
Modern digital transfer protocols are generally 10x the pixel clock in analog terms. For a given clock speed, analog video can be several multiples of effective resolution delivered on time.
Analog standards seem to have stopped at 1080p. Nothing prevents signalling faster, but there are no capable displays to read it. I suppose that might be a neat FPGA project. Take 4K analog signals and stream them to a digital display. Really would only need a scanline or two of buffer for the simpler "just push all the pixels" use case. Frame buffer.
8-bit computers likely wouldn't be able to keep up with the bandwidth requirements of those systems either.
Also, nothing stops you from implementing an 8-bit CPU with a modern process and push it into the multi gigahertz range except perhaps the fact it’ll be too small for current machinery to manipulate.