<P> The 1977 model was monochromatic by design . The efficient Blue LED completing the color triad , did not arrive for another decade . Large displays now use high - brightness diodes to generate a wide spectrum of colors . It took three decades and organic light - emitting diodes for Sony to introduce an OLED TV , the Sony XEL - 1 OLED screen which was marketed in 2009 . Later , at CES 2012 , Sony presented Crystal LED , a TV with a true LED - display ( in which LEDs are used to produce actual images rather than acting as backlighting for other types of display , as in LED - backlit LCDs which are commonly marketed as LED TVs ) . </P>
<P> The 1977 model was monochromatic by design . The efficient Blue LED completing the color triad , did not arrive for another decade . Large displays now use high - brightness diodes to generate a wide spectrum of colors . It took three decades and organic light - emitting diodes for Sony to introduce an OLED TV , the Sony XEL - 1 OLED screen which was marketed in 2009 . Later , at CES 2012 , Sony presented Crystal LED , a TV with a true LED - display ( in which LEDs are used to produce actual images rather than acting as backlighting for other types of display , as in LED - backlit LCDs which are commonly marketed as LED TVs ) . </P>
when did the first led tv come out
when did the first led tv come out
2009
2009