Drive circuit of liquid crystal display

Abstract

This invention provides a driving circuit of LCD including: a first resistor, a second resistor, a first transistor and a second transistor, in which, the first resistor is parallel between the grid and the source of the first transistor, the second resistor is parallel between the grid and the source of the second transistor, the sources of the two transistors are used in receiving voltage signals, the drains of them are used in outputting voltage signals, in which, the driving circuit also includes a delay circuit connected with the grids of the two transistors and delaying the output of the voltage signals output by the two transistors. The driving circuit of the invention applies digital circuit to delay signals, its design sequence of the time sequence will not change because of environment factors, so it's more stable than analog circuit.

Description

【Technical field】 [0001] The invention relates to a liquid crystal display drive circuit. 【Background technique】 [0002] TFT-LCD is a kind of active-matrix LCD. The TFT-LCD panel is provided with a light source on its back, which can actively control each independent pixel on the panel. Moreover, since the thin film transistor liquid crystal display is an active matrix driving method, the arrangement of the liquid crystal has memory, and it will not return to the original state immediately after the current disappears. [0003] In the current liquid crystal display driving circuit, the gate driver needs to use two different driving voltages of high voltage (about 20V) and low voltage (about -7V) to drive the gate of the thin film transistor, which are used to turn on and off the thin film transistor respectively; at the same time, the source The electrode driver needs to use an AVDD voltage (about 9V) to drive the source of the thin film transistor. In the design process ...

AI Technical Summary

Problems solved by technology

[0005] The above-mentioned first delay circuit 1 and second delay circuit 2 are all analog circuits, which are respectively composed of analog element resistance and capacitance, because the analog circuit forms a delay circuit with resistance and capacitance, and the principle of delay is to use resistance to limit the current flowing into the capacitance, so Make the charging of the capacitor slow and get the time difference

This kind of circuit will be inaccurate due to heat or differences in the performance of various components, so the circuit is not stable enough

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