Sony: first flexible colour OLED display
CNET News is reporting on the world’s first truly flexible OLED display fabricated by Sony.
According to Pink Tentacle
The 2.5-inch prototype display supports 16.8 million colors at a 120 x 160 pixel resolution (80 ppi, .318-mm pixel pitch), is 0.3 mm thick and weighs 1.5 grams without the driver.
The prototype, as well as technical details were presented at the SID conferernce. Apparently the display is driven by pentacene TFTs with a mobility of 0.1 cm2/Vs.
Each subpixel (red, green or blue)is driven by a two-transistor, one-capacitor PMOS voltage programming circuit. The display operates at a frame rate of 60 Hz with a signal voltage of 12 V.
Sony uses a top-emission structure for its OLED displays, meaning they have driving transistors on the bottom and emit light from a top OLED layer. [...] The structure reportedly allowed the engineers to fabricate the electrodes before fabricating the organic TFT layer, without damaging the semiconductor layer.
The latter is achieved by depositing the pentacene on a patterned, negatively-sloped layer acting as a “built-in shadow mask”.