Patent ID: 8436798
Filing Date: 2013-05-07
Classification: G02F,G09G

Abstract:
1. An electro-optic device comprising: a first substrate; a second substrate; an electro-optic layer, wherein the first substrate and the second substrate sandwich the electro-optic layer; a common electrode; a pixel electrode, the common electrode and the pixel electrode being disposed on one of the first substrate and the second substrate, the common electrode being used to drive the electro-optic layer, the pixel electrode being disposed closer to the electro-optic layer than the first electrode, wherein a constant first signal potential is input to the common electrode and a second signal potential is input to the pixel electrode, and wherein according to an alternating current drive signal applied to the electro-optic layer, in a first period the second signal potential applied to the pixel electrode is higher than the first signal potential applied to the common electrode, and in a second period the second signal potential applied to the pixel electrode is lower than the first signal potential applied to the common electrode, the first signal potential remaining constant throughout the first and second periods; and an insulating film formed between the common electrode and the pixel electrode, the pixel electrode being formed between the electro-optic layer and the insulating film, wherein: (a) in the second period when the first signal potential is higher than the second signal potential: (b) in the first period when the first signal potential is lower than the second signal potential: a control unit configured to shift the second signal potential such that the first potential difference (B) is larger than the second potential difference (A) when the first gray-scale is equivalent to the second gray-scale, wherein the control unit is further configured to gradually increase a shift amount (ΔV=B−A) of the one of the first signal potential and the second signal potential based on an increase of the gray-scale level to suppress an image sticking in the electro-optic layer.