Patent ID: 9589517
Date: 2017-03-07
CPC Classifications: G09G

Claim:
1. A liquid crystal display device, which employs pause driving of providing 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 inputted from the outside, 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; an image change determination portion that receives the image signal and determines the presence or absence of an image change with respect to each frame; and a reversal driving control portion that 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 spatial polarity reversal of the voltage applied to the liquid crystal is relatively low or a second reversal driving technique where the frequency of 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 the image change determination portion detects an image change in a period from the previous refresh frame until generation of m (m is an integer not smaller than 2) times of pause frames, the reversal driving control portion sets the next frame after the frame where an image change has been detected to a refresh frame and sets a reversal driving technique in the refresh frame to the first reversal driving technique, and when the image change determination portion does not detect an image change in the period from the previous refresh frame until generation of m times of pause frames, the reversal driving control portion sets the next frame after the final pause frame to a refresh frame and sets an reversal driving technique in the refresh frame to the second reversal driving technique.