Shifting register and thin film transistor liquid crystal display

Abstract

The invention provides a shifting register and a thin film transistor liquid crystal display. The shifting register comprises multiple cascaded shifting registering circuits, and each circuit is composed of nine transistors and one capacitor, wherein each shifting registering circuit comprises a pulling-up transistor, a first pulling-down transistor and a second pulling-down transistor of a signal output module, a third pulling-down transistor, a switching transistor, a first capacitor, a resetting transistor, a first auxiliary pulling-down transistor and a second auxiliary pulling-down transistor of an auxiliary pulling-down module, a third auxiliary pulling-down transistor and a second capacitor; and the third auxiliary pulling-down transistor and the second capacitor are connected in parallel. The second capacitor is used as a buffering device and can filter surplus burr signals in output signals to reduce signal crosstalk; and meanwhile, the first pulling-down transistor and the second pulling-down transistor can respectively work in a half pulling-down period so that the drifting of threshold voltage, caused by too big width-length ratio of the transistor is inhibited and the stability of a circuit is further guaranteed. The auxiliary pulling-down module is arranged so that an output waveform of a second node is more stable.

Description

technical field [0001] The invention relates to liquid crystal flat panel display technology, in particular to a shift register and a thin film transistor liquid crystal display. Background technique [0002] The FPD (Flat Panel Display Device) technology represented by TFT-LCD (Thin film transistor-Liquid crystal display) has developed rapidly since the 1990s and gradually matured. Since TFT-LCD has the advantages of high definition, low power consumption, thinness, and portability, it has been widely used in the above-mentioned information display products, making LCD enter a new stage of high-quality, high-color display, and has broad market prospects. At present, almost all high-end LCDs use TFT active matrix without exception. TFT (Thin film transistor) active matrix mainly includes A-Si (amorphous silicon) TFT active matrix and P-Si (poly-silicon) TFT active matrix. Compared with P-Si TFT technology, A-Si TFT technology is more mature, with good uniformity and lower ...

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Problems solved by technology

When the product resolution is further increased, it becomes very difficult to make more external leads in a limited space

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