Liquid crystal display device
AssigneesJapan Display Inc., Panasonic Liquid Crystal Display Co., Ltd.
InventorsMasahiro Maki, Hideo Sato, Hiroyuki Abe
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Abstract
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.
Claims3
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.
Dependencies are inferred from the claim text.