Liquid crystal display device and driving method therefor

Abstract

Disclosed is a liquid crystal display device provided with a monolithic gate driver, wherein residual charge in a pixel formation portion can be rapidly eliminated when the power is turned off. In a bistable circuit which constitutes a shift register in a gate driver (24), a thin-film transistor having a drain terminal connected to a gate bus line, a source terminal connected to a reference potential line for transmitting a reference potential (H_SIG_VSS), and a gate terminal to which a clock signal (HCK_1, HCK_2) for operating the shift register is given is provided. When a power OFF detection unit (17) detects the cutoff of the supply of power-supply voltage (PW) from the outside, the clock signal (HCK_1, HCK_2) is driven high to turn the thin-film transistor on, and a reference potential switching circuit (19) switches the reference potential (H_SIG_VSS) from a gate off potential (VGL) to a gate on potential (VGH).

Description

[0001] technology area [0002] The present invention relates to a liquid crystal display device including a single-chip gate driver and a driving method thereof. Background technique [0003] Generally, an active matrix liquid crystal display device includes a liquid crystal panel composed of two substrates sandwiching a liquid crystal layer, and a plurality of gate bus lines (scanning signal lines) are connected to one of the two substrates. Lines) and a plurality of source bus lines (video signal lines) are arranged in a lattice, and a plurality of pixel forming portions arranged in a matrix corresponding to the intersections of the plurality of gate bus lines and the plurality of source bus lines are provided. Each pixel forming part includes a thin film transistor (TFT) as a switching element, a pixel capacitor for holding a pixel value, and the like. Source bus connection at the crossover point. In addition, on the other one of the above-mentioned two substrates, a com...

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Problems solved by technology

In addition, if the power of the device is turned on in a state where residual charges are accumulated in the pixel formation portion, the shift of impurities in the residual charges will cause flickering, etc., resulting in a decrease in display quality.

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