Driving method for removing residual images of LCD display screen, LCD display screen and storage medium

Abstract

The invention discloses a driving method for removing residual images of an LCD display screen, the LCD display screen and a storage medium. The method comprises the steps of obtaining theoretical optimal driving voltage of liquid crystal pixels of the LCD display screen and corrected optimal driving voltage which actually drives the liquid crystal pixels of the LCD display screen; according to the theoretical optimal driving voltage and the corrected optimal driving voltage, obtaining debugging voltage for adjusting standard optimal driving voltage (Vcom) to the theoretical optimal driving voltage (V); according to the corrected optimal driving voltage and the debugging voltage, determining the highest amplitude and lowest amplitude of actual driving voltage; according to the highest amplitude and lowest amplitude of the actual driving voltage, determining the waveform of the actual driving voltage and driving the LCD display screen under the actual driving voltage. By dynamically adjusting the Vcom value before and after a thin film transistor is turned on / off, positive and negative residual image influences generated on liquid crystals can counteract each other, so that generation of polarization is avoided, the residual images are removed, the failure rate of the residual images on the LCD display screen is decreased, and the service life is prolonged.

Description

technical field [0001] The invention relates to the technical field of LCD display screens, in particular to a driving method for eliminating residual images of LCD display screens, LCD display screens and storage media. Background technique [0002] TFT-LCD (Thin Film Transistor-Liquid Crystal Display, Thin Film Transistor-Liquid Crystal Display) is a common display product at present. Because of its small size, low power consumption, no radiation and relatively low production cost, more and more It is widely used in high-performance display fields, such as outdoor display applications and vehicle displays. [0003] A TFT-LCD display is controlled by multiple pixel (pixel) switches, and a pixel (pixel) such as figure 1 As shown, it is composed of Gate electrode, Source electrode, and Vcom electrode. The Gate electrode controls the Source to turn on or off, and the voltage between the Source and Vcom electrodes is the required voltage for the actual display screen of the TF...

AI Technical Summary

Problems solved by technology

[0004] When the TFT-LCD is working, when a forward voltage is applied to the liquid crystal molecules, due to the effect of coupling voltage and parasitic voltage, on the falling edge of the Gate signal, that is, when the Gate signal disappears, the charging power of the Pixel has a weak charge. During the falling process, the voltage held by a part of the Pixel will be lost, and when the liquid crystal is charged with a reverse current, it can also be found that there is a slight loss of voltage after the charging is completed.

Therefore, after a charge and discharge is completed, the Pixel has voltage asymmetry in the relative direction: the positive and negative directions of the Vcom voltage (that is, figure 2 The theory of the example is that the positive and negative voltage difference between the source and vcom in the perfect pixel driving waveform is difficult to be symmetrical about vcom), so that DC (direct current) will inevitably be generated in the liquid crystal box when the LCD is charged and discharged. When the residual DC is large enough , it will cause the liquid crystal molecules not to be driven by the signal voltage, which will cause the liquid crystal molecules to be polarized, which will cause the liquid crystal molecules to not deflect normally under the control of the signal voltage, and cause the LCD screen to produce afterimages when the screen is replaced under long-term action (Area Image) phenomenon

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