Patent ID: 8514158
Filing Date: 2013-08-20
Classification: G09G

Abstract:
1. A liquid crystal driving device comprising: a liquid crystal panel whose transmittance changes depending on an applied voltage; and a source driver that applies a display voltage set according to a gray level of an input signal to said liquid crystal panel with timing determined by an input signal; wherein, said source driver applies an overshooting driving voltage for only transition to a higher voltage, when the display voltage to be applied to said liquid crystal panel is controlled so as to be a highest-level voltage out of display voltages corresponding to a range of input gray levels, which is added to a voltage side being higher than said highest-level voltage out of said display voltages, to said liquid crystal panel; wherein, said source driver applies an overshooting driving voltage for only transition to a lower voltage, when the display voltage to be applied to said liquid crystal panel is controlled so as to be a lowest-level voltage out of display voltages corresponding to a range of input gray levels, which is added to a voltage side being lower than said lowest-level voltage out of said display voltages, to said liquid crystal panel; wherein the overshooting driving voltages for only transition to a higher voltage and for only transition to a lower voltage are set independently from said display voltages, each of which is output from a resistor ladder circuit, the overshooting driving voltages being output from a circuit other than said resistor ladder circuit; wherein the overshooting driving voltages for only transition to a higher voltage and for only transition to a lower voltage are only used for overshooting driving voltages; wherein a frame rate controller generates display voltages for halftones, corresponding to a number of voltages for input gray levels being in short supply caused by setting of the overshooting driving voltages for transition to a higher voltage and for transition to a lower voltage, based on the input signals; and wherein the frame rate controller generates the display voltages for halftones by performing a frame thinning-out operation for the number of voltages for input gray levels being in short supply; wherein the display voltages for halftones are either continuous display voltages or discrete display voltages.