Significant problems occur when Developers of flexible displays attempt to use OLED's because they are hampered by the fact that the OLEDs get hotter than the plastic substrate, making manufacture difficult and expensive.
So LG Philips instead of making pixels out of OLEDs, has designed pixels out of oil and water contained in tiny plastic cells connected to plastic electrodes. The oil, which is opaque, floats on the water and obscures a coloured surface beneath. But applying an electric field forces the oil away from the water, revealing the coloured layer beneath and changing the colour of the pixel. This type of reflective display can be made at low temperatures in a small number of steps, says the company.
via Endgadget
