A display device comprising an electrophoretic medium, a first viewing surface on one side of the electrophoretic medium and a second surface on the opposite side of the electrophoretic medium, the electrophoretic medium being sandwiched between a common electrode (15; 25) adjacent to the viewing surface and a layer of pixel electrodes (16a; 26) adjacent to the second surface defining pixels, respectively, and comprising a first type of particles (11; 21), a second type of particles (12; 22), and a third type of particles (13; 23), all dispersed in a solvent or solvent mixture; the first (11; 21), second (12; 22) and third (13; 23) types of particles having respectively first, second and third colors differing from one another; the first type of particles (11; 21) having a charge of one polarity and the second (12; 22) and third (13; 23) types of particles having charges of the opposite polarity, and the second type of particles (12; 22) having an electric field threshold such that the application of an electric field lower than the electric field threshold to the electrophoretic medium of a pixel for a period of 15 seconds will not cause the second color to be visible at the viewing surface when the pixel is driven from a color different from the second color; the display device further comprising driving means arranged to: (a) apply a potential difference between the common electrode (15; 25) and a pixel electrode (16a; 26) to generate an electric field stronger than the electric field threshold and having a polarity driving the second type of particles (12; 22) towards the common electrode (15; 25), thereby causing the pixel to display the second color at the viewing surface; (b) apply a potential difference between the common electrode (15; 25) and said pixel electrode (16a; 26) to generate an electric field stronger than the electric field threshold and having an opposite polarity to drive the first type of particles (11; 21) towards the common electrode (15; 25), thereby causing the pixel to display the first color at the viewing surface; and (c) once the first optical characteristic is displayed at the viewing surface, apply a potential difference between the common electrode (15; 25) and said pixel electrode (16a; 26) to generate an electric field weaker than the electric field threshold and having a polarity driving the third type of particles (13; 23) towards the common electrode (15; 25), thereby causing the pixel to display the third color at the viewing surface, the display device being characterized in that the electrophoretic medium further comprises a fourth type of particles (14; 24) which are color-enhancing particles, bear charges of the same polarity as the second (12; 22) and third (13; 23) types of particles and have a mobility similar to that of the third type (13; 23) of particles so that when the third color is displayed at the viewing surface, the fourth type (14; 24) of particles block the first (11; 21) and second (12; 22) types of particles from being seen at the viewing surface, thus enhancing the third color. (a) apply a potential difference between the common electrode (15; 25) and a pixel electrode (16a; 26) to generate an electric field stronger than the electric field threshold and having a polarity driving the second type of particles (12; 22) towards the common electrode (15; 25), thereby causing the pixel to display the second color at the viewing surface; (b) apply a potential difference between the common electrode (15; 25) and said pixel electrode (16a; 26) to generate an electric field stronger than the electric field threshold and having an opposite polarity to drive the first type of particles (11; 21) towards the common electrode (15; 25), thereby causing the pixel to display the first color at the viewing surface; and (c) once the first optical characteristic is displayed at the viewing surface, apply a potential difference between the common electrode (15; 25) and said pixel electrode (16a; 26) to generate an electric field weaker than the electric field threshold and having a polarity driving the third type of particles (13; 23) towards the common electrode (15; 25), thereby causing the pixel to display the third color at the viewing surface,