Liquid crystal display panel, driving method and driving circuit thereof and display device

Abstract

The invention discloses a liquid crystal display panel, a driving method and a driving circuit thereof and a display device. The driving method comprises the following steps: a temperature detector detects the temperature of an environment in which the liquid crystal display panel is located, and transmits the temperature to a clock controller; the clock controller controls a power supply management circuit to output a grid signal opening voltage and a grid signal closing voltage to a grid driving circuit and controls a public electrode driving circuit to output a public electrode voltage according to the received temperature and the pre-stored correspondence of the temperature and the grid signal opening voltage, the grid signal closing voltage and the public electrode voltage; thus, the grid signal opening voltage, the grid signal closing voltage and the public electrode voltage can be adjusted to optimum values in real time according to the temperature of the environment in which the liquid display panel is located, so as to avoid the problem of abnormal displayed pictures of the liquid display panel in different temperature environments.

Description

technical field [0001] The invention relates to the field of display technology, in particular to a liquid crystal display panel, a driving method thereof, a driving circuit thereof and a display device. Background technique [0002] Due to the advantages of low power consumption, low driving voltage, easy driving, direct drive by large-scale integrated circuits, simple structure, low cost, and long life, liquid crystal display panels have become a new star in the display field and a bright spot in economic development. [0003] When the liquid crystal display panel is in a low-temperature environment, the mobility of carriers in the active layer of the thin film transistor (Thin Film Transistor, TFT) will decrease, and it is necessary to increase the gate signal turn-on voltage V gh To improve the driving capability of the TFT, however, the gate signal turn-on voltage V gh Increasing the capacitance C between the gate line and the source gs increased by Among them, ΔV ...

AI Technical Summary

Problems solved by technology

[0003] When the liquid crystal display panel is in a low-temperature environment, the mobility of carriers in the active layer of the thin film transistor (Thin Film Transistor, TFT) will decrease, and it is necessary to increase the gate signal turn-on voltage V gh To improve the driving capability of the TFT, however, the gate signal turn-on voltage V gh Increasing the capacitance C between the gate line and the source gs increased by Among them, ΔV P V gh is the gate signal turn-on voltage, V gl is the gate signal off voltage, C gs is the capacitance between the gate line and the source, C lc is the capacitance between the pixel electrode and the liquid crystal molecules, C s is the storage capacitance between the pixel electrode and the common electrode, it can be deduced that the gate signal turn-on voltage V gh and the capacitance C between the gate line and the source gs Increasing the voltage difference ΔV before and after the voltage of the pixel electrode jumps P becomes larger, and the common electrode voltage V com Left unchanged, can cause serious flickering issues with LCD panels

When the LCD panel is in a high temperature environment, the threshold voltage V of the TFT th will drift toward lower voltages, and a gate signal shutdown voltage V gl greater than the threshold voltage V th In this case, the leakage current of the TFT will increase, which will affect the display quality of the liquid crystal display panel.

[0004] Therefore, how to avoid the abnormality of the display screen of the liquid crystal display panel in different temperature environments is a technical problem that those skilled in the art need to solve urgently.

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