Liquid crystal display device
View Patent ↗A liquid crystal display device which can reduce a circuit scale of a drive circuit is provided. A TFT substrate of the liquid crystal display device includes a pixel circuit in each pixel, and the pixel circuit includes a thin film transistor, a pixel electrode which is connected to a source side of the thin film transistor, and a common electrode which is one planar transparent electrode extending in a display region in a planar shape. A vertical drive circuit includes a transistor which is driven by a control signal voltage including a clock signal from a drive IC, and constitutes a damper for a high voltage. The drive IC outputs an equalizing switch signal voltage to equalizing switches which connect the common electrode and data signal lines.
1. A liquid crystal display device comprising:
a liquid crystal display panel;
a plurality of pixel electrodes which are mounted on the liquid crystal display panel;
a common electrode which is arranged on the same substrate as the pixel electrodes and forms an electric field between the common electrode and the pixel electrodes;
pixel transistors each of which is connected to the pixel electrode and constitutes a switch for applying a grayscale voltage to the pixel electrode;
data signal lines which are connected to the pixel transistors and to which the grayscale voltage is applied;
equalizing transistors which constitute switches for making the common electrode and the data signal lines conductive with each other; and
a shift register which sequentially applies a signal to gate lines of the pixel transistors, wherein
the equalizing transistor is located at a position sandwiched between the same substrate and the common electrode, and is operated so as to make the common electrode and the data signal line conductive with each other at a cycle that the polarity of the common electrode is reversed, and
the shift register includes a transistor which constitutes a damper for attenuating a potential difference.
2. The liquid crystal display device according to claim 1 , wherein a clock signal is inputted to the shift register, and the transistor which constitutes the damper is arranged between a node to which a voltage which is twice as large as a voltage of a clock signal is applied and a node to which the clock signal is inputted.
3. The liquid crystal display device according to claim 1 , wherein a plurality of transistors each of which constitutes the damper are connected in series.