Display driving circuit, voltage conversion device, and display device and shutdown control method thereof

Abstract

The invention discloses a display driving circuit, a voltage conversion device, and a display device and a shutdown control method thereof, and belongs to the field of display. The display driving circuit includes a voltage converter and a source driver. The voltage converter has a first end to be connected to the positive voltage of a power source, and a second end for outputting a digital positive voltage to the source driver. The display driving circuit further includes a switch module and a voltage comparison module, wherein the switch module is disposed on a voltage transmission path between the second end of the voltage converter and the source driver; and the voltage comparison module is connected to the first end of the voltage converter and is configured to control the switch module to cut off the voltage transmission path when a voltage at the first end of the voltage converter is less than a reference voltage. The display driving circuit helps to eliminate the shutdown display anomaly caused by the excessively fast power-down speed and improve the performance of the display device.

Description

technical field [0001] The invention relates to the display field, in particular to a display driving circuit, a voltage conversion device, a display device and a shutdown control method thereof. Background technique [0002] In existing display devices, the voltage converter (DC-DC Converter) is mainly used to convert the power supply voltage into various voltages required by other components, such as timing controller (Timimg Controller, TCON), gate driver (Gate Driver ) and the digital positive voltage (AVDD) required by both the source driver (Source Driver), the turn-on voltage (Von) and turn-off voltage (Voff) required by the gate driver, and the common voltage (Vcom) required by the display panel, etc. Wait. During the normal shutdown process of the display device, the voltage converter that loses power supply will use the charge stored in the capacitor to supply power to other components for a short period of time, so that the relevant components can complete operat...

AI Technical Summary

Problems solved by technology

[0003] However, in some application scenarios, the voltage drop rate at the power connection terminal of the voltage converter may be too fast, so that the voltage obtained by the relevant components has dropped below the working voltage before the shutdown operation is completed.

For example, when shutting down, the gate driver needs to output the turn-on voltage to all gate lines under the trigger of the high level of the full-on control signal (XON), but the full-on control signal may drop to low level prematurely, which will make the Some pixels cannot fully return to the reset state, resulting in bad image after shutdown

Images