Patent ID: 8629858
Filing Date: 2014-01-14
Classification: G06F,G09G

Abstract:
1. A liquid crystal device comprising: a first substrate; a second substrate that is opposed to the first substrate; liquid crystal that is sealed in a gap between the first substrate and the second substrate; a detection electrode that is provided on a side of the first substrate, opposite to a side on which the liquid crystal is provided, wherein the detection electrode detects a contact on the basis of variation in capacitance; a plurality of scanning lines; at least one signal line that intersects with the plurality of scanning lines; a plurality of control lines that are provided in correspondence with the scanning lines; a plurality of pixel circuits that are formed in the second substrate at positions corresponding to intersections of the at least one signal line and the plurality of scanning lines, wherein each of the plurality of pixel circuits includes a storage capacitor, a liquid crystal capacitor formed of a pixel electrode that is connected through a switching element to a corresponding one of the at least one signal line, an opposite electrode that is formed between the pixel electrode and the liquid crystal and is connected to a corresponding one of the control lines, and the liquid crystal to which lateral electric field generated between the pixel electrode and the opposite electrode is applied; a selection circuit that selects each of the plurality of scanning lines in every selection period arranged at an early stage of each inversion unit, wherein the selection circuit makes the switching element of the pixel circuit a conductive state during one selection period in one inversion unit, the pixel circuit corresponding to the scanning line selected during the one selection period and wherein the selection circuit makes the switching element of the pixel circuit a non-conductive state after the one selection period in the one inversion unit; a signal supplying circuit that supplies a data signal to the signal line during each of the selection periods, the data signal being supplied with an electric potential corresponding to a gray scale level designated for the pixel circuit; and an electric potential control circuit that generates a control signal for determining a voltage to be applied to the liquid crystal capacitor in the pixel circuit corresponding to the selected scanning line, and outputs the control signal to the corresponding one of the control lines, wherein the plurality of control lines are disposed between a detection electrode and at least the pixel electrode, an electric potential of the control signal is set to a low electric potential when the polarity of voltage to be applied to the liquid crystal capacitor is positive in a first selection period in a first inversion unit, set to a reference electric potential after the first selection period in the first inversion unit, set to a high electric potential when the polarity of voltage to be applied to the liquid crystal capacitor is negative in a second selection period in a second inversion unit consecutive to the first inversion unit, and set to the reference electric potential after the second selection period in the second inversion unit, the reference electric potential being an intermediate electric potential between the low electric potential and the high electric potential, and among the plurality of control lines, only an electric potential to be applied to the control line corresponding to the scanning line selected by the selection circuit is set to the low electric potential or the high electric potential during the selection period, while an electric potential to be applied to the control lines corresponding to the non-selected scanning lines are maintained at the reference electric potential, thereby reducing a noise of the detection electrode due to variation in electric potential of the opposite electrodes.