Control circuit, control method and display device

Abstract

The invention provides a control circuit, a control method and a display device. The control circuit comprises a control module and a driving module; firstly, by virtue of the control module, before triggering the driving module to output voltage to various canning lines after shutdown, existing second voltage is increased to third voltage and the third voltage is outputted to the driving module,and then the third voltage is outputted to the various canning lines by virtue of the driving modules; by increasing the voltage which is outputted to the various canning lines, voltage decrease caused by power consumption or output delay of self-wiring of a panel can be partially offset; in comparison with the prior art, the control circuit can prolong TFT starting time in the display panel, so that the complete release of charges in the panel is achieved and a purpose of eliminating shutdown ghost is achieved; and meanwhile, a splash screen phenomenon, which is caused when the display deviceis rapidly turned on and turned off for several times, can be prevented.

Description

technical field [0001] The invention relates to the technical field of photoelectric display, in particular to a control circuit, a control method and a display device. Background technique [0002] At present, in TFT-LCD (Thin Film Transistor Liquid Crystal Display, Thin Film Transistor Liquid Crystal Display, thin film transistor liquid crystal display, there is a problem of residual image after shutdown. The existing solution is to use the drive module POWER IC or LevelShifter IC to detect power-down of the power supply voltage VDDin to the setting When the value is Vref, the XON (or XAO, Output All-OnControl) signal is triggered, and the Gout signals of all rows are pulled up to the VGH level, and the TFTs of the pixel electrodes of all rows are all turned on, so that the panel is discharged. However, due to the power consumption and output delay of the panel's own wiring, the potential of VGH will drop rapidly under the consumption of the back-end load when the power is...

AI Technical Summary

Problems solved by technology

However, due to the power consumption and output delay of the panel's own wiring, when the power is turned off, the VGH potential will drop rapidly under the consumption of the back-end load. In addition, the IC needs a certain response time to pull up all Gate signals to VGH, resulting in The amplitude of the VGH that is actually transmitted to the Gate line is reduced, and the discharge time for the Pixel is shortened, resulting in the inability to fully discharge the charge in the Panel, there is still a power-off afterimage, and there will be a flickering phenomenon when the power is turned on many times quickly, especially in the pursuit of In the NB products with fast power on and off, with the upgrade of the Bios of the whole machine, the speed of VDDin power down will be accelerated as a whole, which will lead to more serious after-image after power off

Images