Method for driving liquid crystal display device

摘要

An object is to suppress deterioration of a displayed image even when a refresh rate is reduced in displaying a still image. A liquid crystal display device includes a pixel transistor electrically connected to a pixel electrode, and a capacitor having one electrode electrically connected to the pixel electrode and the other electrode electrically connected to a capacitor line. The pixel transistor is turned on and a voltage based on an image signal is supplied to the pixel electrode, and then, the pixel transistor is turned off so that a holding period during which the pixel electrode holds the voltage based on the image signal starts. A holding signal corresponding to change of the voltage based on the image signal in the pixel electrode in the holding period is supplied to the capacitor line so that a potential of the pixel electrode is constant.

主权项

1. A method for driving a liquid crystal display device that is capable of displaying a still image and a moving image, the liquid crystal display device comprising a transistor electrically connected to a pixel electrode, and a capacitor having a first electrode electrically connected to the pixel electrode and a second electrode electrically connected to a capacitor line, wherein a gate of the transistor is electrically connected to a gate line, wherein a channel formation region of the transistor comprises an oxide semiconductor, and wherein an off-state current per micrometer of a channel width of the transistor is 10 aA/μm or less,
the method comprising the steps of: supplying an image signal to the pixel electrode through the transistor by turning on the transistor in a writing period; holding a potential of the pixel electrode by turning off the transistor in a holding period to display the still image; and adjusting a potential of the capacitor line at least during the holding period in a manner that accounts for changes in the potential of the pixel electrode due to leakage current in the liquid crystal, whereby image deterioration during display of the still image is reduced, wherein a refresh rate during display of the still image is lower than a refresh rate during display of the moving image.