TFT-LCD display is a thin film transistor type liquid crystal display, known as "true color" (TFT). Each pixel of TFT-LCD has a semiconductor switch, and each pixel can be directly controlled by a point pulse, so each node is relatively independent and can be continuously controlled, which not only improves the response speed of the display, but also can accurately control the display color level, so the color of TFT-LCD is more realistic, vibrant colors, but also has the disadvantages of relatively high power consumption and high cost.

Thin-film transistor is a kind of active matrix liquid crystal display. It can "actively" control each individual pixel on the screen, which can greatly improve the response time. The general response time of TFT is relatively fast, about 80 milliseconds, and the viewing angle is large, generally reaching about 130 degrees.

Thin film transistor LCD polarity conversion mode:

The driving voltage of the liquid crystal molecule cannot be fixed at a certain value, otherwise the liquid crystal molecule will be polarized for a long time and thus gradually lose its spin characteristics. Therefore, in order to avoid damaging the nature of the liquid crystal molecules, the polarity of the driving voltage of the liquid crystal molecules must be changed, which requires the display voltage in the TFT-LCD to be divided into two polarities, one is positive and the other is negative. When the voltage of the display electrode is higher than the voltage of the common electrode, it is called positive polarity. When the voltage of the display electrode is lower than the voltage of the common electrode, it is called negative polarity. Whether positive or negative, there will be a set of grayscale with the same brightness, so when the absolute value of the pressure difference between the upper and lower glass layers is fixed, the displayed grayscale is exactly the same. However, in both cases, the liquid crystal molecules are turned in exactly opposite directions, which avoids the destruction of the above-mentioned characteristics when the turn of the liquid crystal molecules is always fixed in one direction. There are four common polarity conversion modes, namely frame-by-frame inversion, row-by-row inversion, column-by-column inversion and point-by-point inversion.

For frame-by-frame inversion, all adjacent points in the same frame have the same polarity and adjacent frames have different polarities; for line-by-line inversion mode, the same polarity exists on the same line, but adjacent lines have different polarities; for column-by-column inversion mode, the same column has the same polarity and adjacent columns have different polarities; for point-by-point inversion, each point has different polarities from its adjacent upper, lower, left and right points.

At present, most of the TFT-LCD commonly used in personal computers are changing the polarity of the panel point by point.

The reason is that the display quality of point-by-point inversion is much better than other transformation methods. The table shows the performance comparison of four polarity conversion modes: frame-by-frame inversion, row-by-row inversion, column-by-column inversion and point-by-point inversion. The so-called flicker phenomenon is that the screen will have a flickering feeling, but it is not a special visual effect, but because every time the screen is updated - the gray scale of the displayed screen will change slightly, giving the impression that the screen is flickering. This is most likely to happen when using the frame-by-frame reversal of polarity conversion mode. Since the whole picture is of the same polarity when reversed frame by frame, the picture will be of positive polarity this time and negative polarity next time. If there is a small error in the common voltage, then the grayscale voltage of the same positive and negative polarity will be different, and of course the grayscale sense will be different. In the case of constantly switching screens, flicker will occur due to the alternating positive and negative screens. The polarity change mode of other panels will also have this flicker phenomenon, because unlike the frame-by-frame inversion, the polarity of the whole screen is changed at the same time, only one line or column, or even a point to change the polarity, the human eye is not obvious.

The so-called crosstalk phenomenon is that between adjacent points, the data to be displayed will affect each other, and thus the displayed picture will be incorrect. Although there are many reasons for the Ctosstalk phenomenon, the CTOSS Talk phenomenon can be reduced as long as the polarity of adjacent points are different.