Based on the development of the TOLED technology, a highly-innovative SOLED™ stacked OLED was made possible.
Conceived by Dr. Stephen R. Forrest and his team at Princeton University in the mid 1990s, this highly-innovative and award-winning SOLED pixel architecture takes advantage of the TOLED’s transparency so that full-color emission can be achieved from red, green, and blue TOLED subpixels that are placed or ‘stacked’ on top of one another.
In the case of a full-color display, SOLEDs may someday take the place of the red, green and blue subpixels that are positioned side-by-side as in CRTs and LCDs today - to offer the same full-color performance in a fraction of the space. SOLEDs allow intensity, color and gray scales to be independently tuned to achieve full-color performance in one pixel.
SOLEDs also offer potential advantages, as demonstrated through recent research, for high-efficiency white OLED lighting panels. With a SOLED, the white emission can be easily tuned from warm to cool white lighting with the turn of a dial. SOLEDs also lead to an increase in total light emission per unit area and better net power efficiency. Plus, because individual OLED units in the stack are driven at <1/n of the current needed for a single OLED pixel (where n is the number of stacked units), longer lifetimes can be achieved.