sony xperia xa1 when did it come out
Sony Xperia XA1 The Sony Xperia XA1 is an Android smartphone produced by Sony. Part of the Xperia X Series, the device was unveiled along with the Sony Xperia XZ Premium, Sony Xperia XZs and Sony Xperia XA1 Ultra at the annual Mobile World Congress in February 2017.
LED display 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).