Patent ID: 7283119
Filing Date: 2007-10-16
Classification: G02F,G09G

Abstract:
1. An electrophoretic display device comprising unit cells each containing i) two display electrodes and two collection electrodes, ii) a clear electrophoretic liquid and iii) two kinds of translucent colored electrophoretic particles having charge polarities different from each other, the unit cells being so constructed that the two display electrodes are disposed superimposingly as viewed from the observer side, wherein each of the unit cells has a first state in which the two kinds of colored electrophoretic particles are both attracted to the two collection electrodes, a second state in which only first particles of the two kinds of colored electrophoretic particles are attracted to one of the display electrodes, a third state in which only second colored electrophoretic particles are attracted to one of the display electrodes, and a fourth state in which the two kinds of colored electrophoretic particles are attracted to the two display electrodes separately, and the fourth state exhibits a color by the principle of subtractive mixture of color stimuli of the colored electrophoretic particles separately present on the two display electrodes.