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Liquid crystal panel polarity inversion driving method and device
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A polarity reversal and liquid crystal panel technology, applied in the direction of instruments, static indicators, etc., can solve problems such as unbalanced liquid crystal deflection, differences in real values, and rising costs, and achieve the effect of avoiding liquid crystal polarization and preventing burn-in
Inactive Publication Date: 2017-02-15
BOE TECH GRP CO LTD +1
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The 2D function is simply processed through the data of several lines in this frame, and the real value of the data in this line cannot be known, which inevitably differs from the real value of the next frame.
Because the polarity is opposite, there is a DC difference value. If a static picture is played for a long time, it will produce a long-term residual DC
The 3D function has a larger storage unit for storing the signals of at least two frames. By comparing the signals of the frames, the signal of the Interlace row is obtained through calculation. The 3D function can handle the above problems well, but because it uses a larger storage unit, rising costs
[0008] Under the action of an electric field, the polar axis of the liquid crystal is affected by the induced charge, resulting in polarization and deflection under the action of the electric field; if it is driven by direct current for a long time, the PI (polyimide) liquid layer and the liquid crystal layer will Accumulated charge, the charge is difficult to release quickly, when the positive and negative polarities are reversed, the residual charge will affect the normal voltage, and the induced charge on the liquid crystal will be inconsistent, resulting in unbalanced liquid crystal deflection and abnormal display. to disappear, such as Figure 4 shown
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Embodiment 1
[0032] This embodiment provides a polarity inversion driving method for a liquid crystal panel. The liquid crystal panel displays images in an interlaced scanning mode. In the method, each frame includes an odd field or an even field, and the odd field and the even field The polarities are different, and the polarity is reversed at a period of 2N frames to drive the liquid crystal for display, where N is a positive integer. The input voltage values of the odd field and the even field are different. The polarity is relative to the polarity of the common electrode voltage. In this embodiment, N=1, the polarity arrangement of a polarity inversion driving cycle is positive, negative, negative, positive, and the effect of the polarity inversion function is as follows Figure 5b shown. For comparison, such as Figure 5a As shown, the signals provided by the existing TV are two frames of odd field and even field alternately, and at the same time, the polarity of TFT-LCD is also ...
Embodiment 2
[0036] In this embodiment, N=4, and the polarity arrangement of a polarity inversion driving cycle is positive, negative, positive, negative, positive, negative, positive, negative, negative, positive, negative, positive, negative, positive , negative, positive. 8-frame polarity inversion function achieves effects such as Figure 5c shown.
Embodiment 3
[0038]This embodiment also provides a polarity inversion drive device for a liquid crystal panel, the liquid crystal panel displays images in an interlaced scanning mode, the device includes a polarity inversion drive unit, and the polarity inversion drive unit is used to 2N frames are cycles of polarity inversion to drive liquid crystals for display. Each frame includes an odd field or an even field, and the polarity of the odd field and the even field are different, where N is a positive integer. Odd field and even field input voltage values are different. Preferably, when N=1, the polarity arrangement of one polarity inversion driving cycle is positive, negative, negative, positive. Preferably, when N=4, the polarity arrangement of one polarity inversion driving cycle is positive, negative, positive, negative, positive, negative, positive, negative, negative, positive, negative, positive, negative, positive, Negative, positive.
[0039] It can be seen from the above emb...
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Abstract
The invention relates to the technical field of liquid crystal panel driving, disclosing a polarity inversion driving method and device for a liquid crystal panel. The liquid crystal panel is used for displaying images by adopting an interlaced scanning way. According to the polarity inversion driving method, each frame comprises an odd filed and an even filed; the polarity of the odd filed is different from that of the even field; and the polarity inversion is carried out with 2N frames as one period so as to drive a liquid crystal for displaying, wherein N is a positive integer. The invention further provides a polarity inversion driving device. According to the polarity inversion driving method, an original positive and negative electrode alternating mode is changed and a fixing frame is added for carrying out one-time polarity inversion, so that an original direct current component towards a certain polarity is transferred to an opposite polarity for residing and further the rotation of the liquid crystal towards one polarity direction due to long-time direct current is avoided, the polarization of the liquid crystal is avoided and the burning is prevented.
Description
technical field [0001] The invention relates to the technical field of liquid crystal panel driving, in particular to a polarity inversion driving method and device for a liquid crystal panel. Background technique [0002] TFT-LCD uses the optical anisotropy and birefringence properties of liquid crystal molecules to display images. According to the video signal, the electric field generated by the electrodes on the opposite substrate surface changes the alignment direction of the liquid crystal molecules, controls the light transmittance of the liquid crystal cell, and thus displays the picture. Generally, TFT-LCD is driven by the alternating voltage polarity method, in which the voltage polarity is alternated between adjacent liquid crystal cells and between continuous frame periods, in order to reduce the deterioration of liquid crystals and enable liquid crystals to Maintain normal characteristics for a long time, and display normally for a long time. If either polarit...
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