Patent ID: 7724415
Filing Date: 2010-05-25
Classification: G02F,G09G

Abstract:
1. A display drive device comprising: a display element including at least one display electrode and one counter electrode disposed opposite to the display electrode, and an electrolyte between the display electrode and the counter electrode, the display element being colored by injecting a first electric charge into the electrolyte via the display electrode due to an oxidation-deoxidization reaction and being decolored by injecting a second electric charge having an inverse polarity of the first electric charge into the electrolyte; at least one constant current supply circuit which supplies a constant current as a decoloration current pulse having a predetermined pulse width to the display electrode upon the decoloration and injects the second electric charge having the inverse polarity into the electrolyte; a voltage detection circuit which detects a voltage value generated in the display electrode; and a control circuit which controls an operation of the constant current supply circuit such that the constant current is supplied to the display electrode continuously from the constant current supply circuit at first, and when the voltage value to be detected by the voltage detection circuit exceeds a preset threshold value, intermittently and repeatedly supplies the decoloration current pulse from the constant current supply circuit to the display electrode upon the decoloration, and ends the decoloration based on the voltage value to be detected by the voltage detection circuit; wherein the threshold value is undated every time the decoloration is made a predetermined number of times, and said predetermined number of times is at least once.