Paul (#7), the green and blue lasers can be generated simply by IR laser diode pumped crystals just like the (now illegal in the US) green and blue laser pointers. The LEDs, however, need a lot of power compared to the baclight for an LCD or you get a washed out picture (perhaps 2W to 5W will be needed for a decent sized picture and about 1W for a 15 inch diagonal in a dimly lit room). I'd guess it's the difficulties with this and the power they need that are slowing things down. You do *not* want to know how much the direct green laser diodes go for
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Paul (#7), the green and blue lasers can be generated simply by IR laser diode pumped crystals just like the (now illegal in the US) green and blue laser pointers. The LEDs, however, need a lot of power compared to the baclight for an LCD or you get a washed out picture (perhaps 2W to 5W will be needed for a decent sized picture and about 1W for a 15 inch diagonal in a dimly lit room). I'd guess it's the difficulties with this and the power they need that are slowing things down. You do *not* want to know how much the direct green laser diodes go for