Patent ID: 8917439

Claim:
A display device comprising one or more sub-pixels or pixels, which device comprises a) a display fluid comprising a first type of charged pigment particles and a second type of charged pigment particles dispersed in a solvent or solvent mixture and said display fluid is sandwiched between a first layer comprising a common electrode which is a transparent electrode layer spreading over the entire top of the display device and on a viewing side and a second layer comprising multiple driving electrodes; and b) a reflective background layer capable of reflecting light back to the viewing side, wherein exposed area in one of said sub-pixels or pixels is at least about 30% of the area of the sub-pixel or pixel and said sub-pixel or pixel displays color of the first type of charged pigment particles when the first type of charged pigment particles moves to be near or at the common electrode, displays color of the second type of charged pigment particles when the second type of charged pigment particles moves to be near or at the common electrode, and displays color of the reflective background layer or color of the solvent or solvent mixture when the first type of charged pigment particles moves to be near or at first selected driving electrodes and at the same time the second type of charged pigment particles moves to be near or at the common electrode at positions opposite the first selected driving electrodes.