Built-in high level generating circuit of liquid crystal display panel

Abstract

The invention provides a built-in high level generating circuit of a liquid crystal display panel, which comprises a driving chip, a VGH / VGL (gate driver high voltage / gate driver low voltage) charge pump, two first level switch circuits and a second level generating circuit, wherein the VGH / VGL charge pump generates high VGH / VGL according to a control signal of the driving chip; the VGH and the VGL are closing and opening voltages of a thin film transistor on the liquid crystal display panel; each of the first level switch circuits is connected with a gate driver on the side of each first level switch circuit, the VGH / VGL charge pump and the driving chip; a control signal voltage region generated by the driving chip is converted to the VGL-VGH and transmitted to the gate drivers; the second level switch circuit is connected with the driving chip and the VGH / VGL charge pump respectively; a working state of the VGH / VGL charge pump is controlled by an instruction of the driving chip; and the VGH / VGL charge pump, the first level switch circuits and the second level switch circuit are all arranged in the liquid crystal display panel and are independent of the driving chip. With the adoption of the built-in high level generating circuit, the area of the driving chip is reduced; a high-voltage process is no longer needed; the production cost is lowered; and as the VGH / VGL of a gate scanning line is generated by the panel automatically, lowering of an effective level caused by connection impedance is reduced.

Description

technical field [0001] The invention relates to the technical field of gate driver switch control of a liquid crystal display panel, in particular, the invention relates to a built-in high level generating circuit of a liquid crystal display panel. Background technique [0002] At present, the GIP (gate Driver in panel (row driver integrated on the panel) technology is to integrate the row driver (gated driver) on the panel (panel), which reduces the impedance of the row scanning signal connected to the panel, and technically improves the display effect of the panel. In addition, because the row driver traces from the driver IC to the panel are reduced, the distance from the panel display area to the edge of the panel is narrowed, thereby improving the utilization rate of the panel and directly increasing the profit of the panel factory. Therefore, major panel makers are scrambling to develop GIP technology, especially the strong demand for high-resolution screens for smart...

AI Technical Summary

Problems solved by technology

[0004] It can be seen that the existing GIP technology integrates the row driver on the panel, but does not include VGH / VGL (respectively, the turn-on voltage / turn-off voltage of the thin film transistor connected to the row scan line of the liquid crystal display panel) high-level generation circuit, which causes the charge pump in the driver chip to generate 32V VGH / VGL power

As a result, on the one hand, the design and manufacturing cost of the driver chip increases, and on the other hand, the effective VGH / VGL level decreases because it needs to be connected to the panel side separately.

[0005] In addition, the line control (gate control) signal amplitude (VGH-VGL) required to turn on / off the thin-film transistor (TFT) on the driver chip control panel is as high as 32V, so the driver chip needs to use a high-voltage process, which is very important for the driver chip manufacturer. Said to increase the cost of production

Images