GOA (Gate Driver On Array) circuit for liquid crystal display device

Abstract

The invention discloses a GOA (Gate Driver On Array) circuit for a liquid crystal display device. The liquid crystal display device comprises a plurality of scanning lines, and the GOA circuit comprises a plurality of shifting cache units which are in cascade connection. The Nth level of shifting cache unit controls charging to the Nth level of scanning line. The Nth level of shifting cache unit comprises a forward and reverse scanning control circuit, a pull-up circuit, a bootstrap capacitive circuit, a grid signal point electric leakage prevention circuit and a pull-down holding circuit. The bootstrap capacitive circuit, the grid signal point electric leakage prevention circuit and the pull-down holding circuit are connected together to form a grid signal point so that the stability of the grid signal point can be improved and the switch use can be reduced.

Description

【Technical field】 [0001] The present invention relates to the field of liquid crystal display technology, in particular to a GOA (Gate Driver On Array, array substrate line scanning) based on LTPS (Low-Temperature Poly-Si) PMOS (P-channel Metal Oxide Semiconductor) used for liquid crystal display devices Drive circuit. 【Background technique】 [0002] GOA is a technology that uses the existing thin-film transistor liquid crystal display array (Array) process to fabricate the gate (Gate) line scanning drive signal circuit on the array substrate to realize the drive mode of progressive scanning of the gate. [0003] With the development of low-temperature polysilicon semiconductor (LTPS) thin-film transistor (TFT), and due to the ultra-high carrier mobility characteristics of LTPS semiconductor itself, the corresponding panel peripheral integrated circuit, that is, GOA, has become the focus of attention, and many People have invested in the related technology research of syste...

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Problems solved by technology

[0003] With the development of low-temperature polysilicon semiconductor (LTPS) thin-film transistor (TFT), and due to the ultra-high carrier mobility characteristics of LTPS semiconductor itself, the corresponding panel peripheral integrated circuit, that is, GOA, has become the focus of attention, and many People have invested in the related technology research of system integration panel (System on Panel, SOP), and it has gradually become a reality. Since LTPS can use ion arrangement technology to adjust the TFT type, NMOS, PMOS and CMOS circuits can be selected, but CMOS and NMOS are in the optical Compared with PMOS, the cost of the cover will be greatly increased, and the circuit structure of CMOS is too complicated, so it is difficult to achieve the design of ultra-narrow bezel. This is particularly important when targeting small-sized display devices. PMOS circuits are cost and circuit structures The advantages on the market make it gradually become the mainstream

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