Image display device having memory property

An image display device having a memory property comprising:

• a display section comprising a first substance in which pixel electrodes are formed, a second substrate in which a facing electrode is formed, and an electrophoretic layer interposed between said first substrate and said second substrate allowing an electrophoresis of electrophoretic particles;
• a voltage applying unit to apply, at time of renewing a screen, a predetermined voltage waveform to said electrophoretic particles between said pixel electrode and said facing electrode to change a display state of said display section from a previous screen to a next screen;
• wherein said electrophoretic particle comprises n-kinds (“n” is a natural number being 2 or more) of charged particles C1, . . . , Ck, . . . , Cn (k=n−1), however, when n=2, Ck is deleted) having colors being different from each other and threshold voltage to initiate an electrophoresis being different from each other and
• wherein each of charged particles C1, . . . , Ck, . . . , Cn satisfies characteristics of relationship of a threshold value voltage of charged particle C1> . . . >threshold voltage of charged particle Ck> . . . >threshold value voltage of charged particle Cn, wherein, when a relative color density of charged particle C1 on a screen to be removed is R1 (0≦R1≦1), . . . , a relative color density of charged particle Ck is Rk (0≦Rk≦1), . . . , and a relative color density of charged particle Cn is Rn (0≦Rn≦1), said voltage applying unit, by applying said predetermined voltage driving waveform, determines the relative color density of said charged particle C1 to be R1, by applying |first voltage|(>threshold value voltage of charged particle C1) and/or 0V, and by referring to the relative color density of said charged particle C1 on the previous screen,
• . . . ,
• then, the relative color density of said charged particle Ck to be Rk, by applying |k-th voltage|(>threshold value voltage of charged particle Ck) and/or 0V, and by referring the relative color density of said charged particle Ck on the previous screen,
• . . . and,
• finally, the relative color density of said charged particle Ck is determined as Rn and, by applying |n-th voltage|(>threshold value voltage of charged particle Cn) and/or 0V, and by referring to the relative color density of said charged particle Cn on said previous screen, (if the color is not reversed, the relative color density of a given plurality of charged particles can be simultaneously determined), renewal of a screen to a next screen having a desired relative color density is realized.

An image display device having a memory property comprising:

• a display section comprising a first substrate in which pixel electrodes are formed, a second substrate in which a facing electrode is formed, and an electrophoretic layer interposed between said first substrate and said second substrate and having an electrophoretic particle allowing an electrophoresis;
• and
• a voltage applying unit, at time of renewing a screen, to apply a voltage driving waveform to said electrophoretic particle between said pixel electrode and said facing electrode to cause a transition of display state of said display section from a previous screen, through an intermediate transition state, to a next screen, wherein said electrophoretic particle comprises two kinds of charged particles C1 and C2 having colors being different from each other and threshold value voltages being different from each other and wherein the threshold value voltage of said charged particle C1 is set so as to be higher than that of said charged particle C2 and wherein said voltage applying unit, at time of renewing a screen, by first resetting a previous screen and then applying a predetermined voltage driving voltage, determines a relative color density in order of said charged particle C1->C2, (if the order is not reversed, the relative color density of charged particles C1 and C2 can be simultaneously determined) to renew a previous screen to a next screen having a desired density.