Data driven unit and drive method thereof

Abstract

The invention relates to a data driven unit and a drive method thereof. The data driven unit comprises a first switching element, a second switching element and a polarity controller, wherein the first switching element is connected between a drive chip buffer and an output end of a drive chip; the second switching element is serially connected with a delay load and connected between the drive chip buffer and the output end of the drive chip; the polarity controller is connected with the first switching element and the second switching element and controls one of the first switching element and the second switching element to be conductive, while the other one to be broken. The drive method comprises the steps that the polarity controller monitors the polarity of data voltage; when the polarity changes, the polarity controller controls the first switching element to be conductive to ensure that the drive chip buffer and the output end of the drive chip are directly connected; and when the polarity is unchanged, the polarity controller controls the second switching element to be conductive to ensure that the drive chip buffer and the output end of the drive chip are connected by the delay load. The invention reduces the deviation of output waveforms of two rows of grate lines, improves the concealed wire phenomenon and increases the display quality.

Description

technical field [0001] The invention relates to a driving device and a driving method of a liquid crystal display, in particular to a data driving device and a driving method thereof. Background technique [0002] At present, the share of thin film transistor liquid crystal display (TFT-LCD) is getting higher and higher. TFT-LCD is developing towards large size and high resolution in terms of size, number of colors and resolution. [0003] In the existing TFT-LCD, the output mode of the data-driven integrated circuit (Driver IC) has nothing to do with the inversion of the polarity, because the waveform output by the data-driven integrated circuit under the same polarity and the output of the data-driven integrated circuit after changing the polarity Different degrees of waveform delay will result in dim line phenomenon. Figure 6a , Figure 6b It is a schematic diagram of driving in a 2-point inversion mode in the prior art, Figure 6a is the schematic diagram of the nth f...

AI Technical Summary

Problems solved by technology

For the first row of gate lines, the polarity of the output data voltage of the data-driven integrated circuit changes, and the increase of the driving area leads to a serious charging delay; for the second row of gate lines, the polarity of the output data voltage of the data-driven integrated circuit does not change , with a slight charge delay

from Figure 7 From the comparison, it can be seen that the delay of the data voltage output on the first row of gate lines is greater than the delay of the data voltage output on the second row of gate lines. The deviation of the data voltage output slew rate (slew rate) leads to the phenomenon of horizontal dark lines. Reduced screen display quality

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