Patent ID: 8149185
Filing Date: 2012-04-03
Classification: G09G,H05B

Abstract:
1. A pixel circuit for driving an electro-optic element having a luminance variation according to a flowing current, comprising: a data line configured to supply a data signal in accordance with luminance information to the pixel circuit; a drive transistor configured to control a current flowing from a first reference potential to the electro-optic element connected to the drive transistor via a first node, the current flowing through the drive transistor corresponding to a control voltage applied to a gate of the drive transistor via a second node connected thereto; a pixel capacitance element connected between said first node and said second node, the pixel capacitance maintaining a constant voltage between the first and second nodes when the electro-optic element is emitting light; a first switch connected between said data line and the second node, the first switch being controlled by a first control line; and a first circuit configured to disconnect said first node from the drive transistor when said electro-optic element is in a first non-emitting state, the first circuit being controlled by a second control line, the first node being at a second reference potential when disconnected from the drive transistor; a second circuit configured to hold said first node at a fixed potential other than the first or second reference potentials when the electro-optic element is in a second non-emitting state, the second circuit being controlled by a third control line separate from the second control line, wherein the first switch, first circuit and second circuit are held in non-conductive states during the first non-emitting state of the electro-optic element, and the first switch and second circuit are held in conductive states and the first circuit is held in a non-conductive state during the second non-emitting state of the electro-optic element, the drive transistor, said first node, and said electro-optic element being connected in series between said first reference potential and second reference potential.