🚀 go-pugleaf

Take a typical low-cost He-Ne or semiconductor-diode laser -- average
power is a few milliwatts (and only red is conveniently available --
blue or green still hard to obtain).  Spread that average light power
out to fill a reasonable TV screen size.  It will be so faint as to be
invisible. To put enough light onto a screen to have a good viewable
picture requires on the order of _watts_ of each color (obviously the
total power needed goes up with screen size).  Present-day visible
lasers with average power outputs in the few watt range cost
kilo-dollars and require kilowatts of electrical power input (not to
mention cooling water, short lifetime, etc.)

Laser projection TV may come, but not for a few years, until major
improvements in visible lasers have occurred.