Patent ID: 9626920
Date: 2017-04-18
CPC Classifications: G09G

Claim:
1. A liquid crystal display device, which employs pause driving to provide a pause frame for suspending a refresh of a screen between two refresh frames for performing a refresh of the screen, and performs image display by applying an AC voltage to liquid crystal based on an image signal irregularly inputted from an external portion, the liquid crystal display device comprising: a liquid crystal panel that includes a plurality of pixel electrodes arranged in a matrix form and a common electrode provided for applying a voltage between the common electrode and the plurality of pixel electrodes through the liquid crystal, and displays an image based on the image signal; a liquid crystal panel driving portion that drives the liquid crystal panel; and a reversal driving control portion that receives the image signal, decides which of a refresh frame or a pause frame each frame is set to, and decides a reversal driving technique for applying an AC voltage to the liquid crystal to be either a first reversal driving technique where the frequency of the spatial polarity reversal of the voltage applied to liquid crystal is relatively low or a second reversal driving technique where the frequency of the spatial polarity reversal of the voltage applied to the liquid crystal is relatively high, to control an operation of the liquid crystal panel driving portion, wherein, when a frame in which the image signal is inputted from the external portion without requesting the external portion to input the image signal is defined as a first input frame, the reversal driving control portion sets the reversal driving technique in the first input frame to the first reversal driving technique while setting the first input frame to a refresh frame that is defined as a first refresh frame, sets n (n is an integer not smaller than 1) frames subsequent to the first refresh frame to pause frames, sets a frame subsequent to the final pause frame to a refresh frame that is defined as a second refresh frame, and sets the reversal driving technique in the second refresh frame to the second reversal driving technique.