Shifting register and thin film transistor liquid crystal displayer

Abstract

The invention provides a shifting register and a thin film transistor liquid crystal displayer. The shifting register comprises multiple levels of shifting register circuits, wherein each of shifting register circuit is composed of eight transistors and two capacitors, each shifting register circuit comprises a pull-up transistor, a first pull-down transistor, a second pull-down transistor, a switch transistor, a first capacitor, a reset transistor, a first auxiliary pull-down transistor, a second auxiliary pull-down transistor, a third auxiliary pull-down transistor and a second capacitor, wherein the pull-up transistor, the first pull-down transistor and the second pull-down transistor are arranged on a signal output module, the first auxiliary pull-down transistor and the second auxiliary pull-down transistor are arranged on an auxiliary pull-down module, and the third auxiliary pull-down transistor and the second capacitor are connected in parallel. The second capacitor serves as a buffer device and can filter out redundant glitch signals of output signals and reduce signal crosstalk. Meanwhile, due to the fact that the first pull-down transistor and the second pull-down transistor respectively work in each half pull-down period, drifting of the threshold voltage due to the over-large breadth-length ratio of each transistor is restrained, and stability of circuits can be ensured. The auxiliary pull-down module is arranged, so that the output waveform of a second node is made to be 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. Because TFT-LCD has the advantages of high definition, low power consumption, light and thin, and easy to carry, it has been widely used in the above information display products, making LCD enter a new stage of high image quality and 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 relatively mature, with good unifor...

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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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