Patent ID: 9390662
Filing Date: 2016-07-12
CPC Classification: G09G

Claim Text:
1. A liquid crystal display device comprising: a liquid crystal display unit that includes a plurality of source signal lines, a plurality of gate signal lines, and a plurality of pixels connected to the source signal lines and the gate signal lines, and displays, for each of frames, an image based on an input image signal; a source drive unit that applies a voltage based on the input image signal to the plurality of pixels of the liquid crystal display unit; and a control unit that controls an amplitude of the voltage applied to the plurality of pixels by the source drive unit, wherein the source drive unit applies, in one of the frames, a voltage of the same polarity to the plurality of pixels connected to one of the source signal lines, the control unit includes: the control unit controls, on the basis of the output value of the adding unit, the amplitude of the voltage applied to the plurality of pixels by the source drive unit, the signal level of the input image signal is a value in a range from a predetermined minimum value to a predetermined maximum value, the gain setting unit sets the gain to a value that is not more than 1, in a case where the temperature information of the source drive unit acquired by the temperature-information acquiring unit indicates that the temperature of the source drive unit is equal to or higher than the reference temperature, the gain setting unit sets the gain to a small value when the signal level of the input image signal is in a vicinity of the minimum value or in a vicinity of the maximum value, compared with a value set when the signal level of the input image signal is an intermediate value between the minimum value and the maximum value, and the control unit reduces, by using the gain set by the gain setting unit, the amplitude of the applied voltage more when the signal level of the input image signal is in the vicinity of the minimum value or in the vicinity of the maximum value than when the signal level of the input image signal is the intermediate value between the minimum value and the maximum value.