Common voltage calibration circuit, circuit board and display device

Abstract

The embodiment of the invention discloses a common voltage calibration circuit, a circuit board and a display device and relates to the technical field of display. The precision and stability degree of common voltage which is actually input to a common electrode can be improved. The common voltage calibration circuit comprises a differencing module, an integral module, a compensation module and asummation module; the input end of the differencing module is connected with the input end of the common voltage and the feedback end of the common voltage, the differencing module is used for acquiring a voltage difference value of the input end of the common voltage and the feedback end of the common voltage, and the voltage difference value is output through the output end; the input end of theintegral module is connected with the output end of the differencing module, the output end of the integral module is connected with the input end of the summation module, and the integral module isused for controlling the precision of the common voltage; the input end of the compensation module is connected with the output end of the differencing module, the output end of the compensation module is connected with the input end of the summation module, and the compensation module is used for compensating the common voltage; the output end of the summation module is connected with the outputend of the common voltage, and the summation module is used for overlapping and outputting results output by the integral module and the compensation module.

Description

technical field [0001] The invention relates to the field of display technology, in particular to a common voltage calibration circuit, a circuit board and a display device. Background technique [0002] Liquid crystal display has become the leading product at present with its advantages such as low power consumption, no radiation, and high resolution. [0003] During the display driving process of the liquid crystal display, the common voltage (V COM ) as the reference voltage for charging each pixel, its stability is related to the actual charging voltage of each pixel, which in turn affects the display effect of the display. In the actual driving process of the panel, due to the interference between the load and the coupling between the signals, it will affect the V COM Pulling occurs, which in turn leads to distortion of the actual charging voltage of the pixel and asymmetry of positive and negative polarity voltages, resulting in display defects such as cross-talk and...

AI Technical Summary

Problems solved by technology

In the actual driving process of the panel, due to the interference between the load and the coupling between the signals, it will affect the V COM Pulling occurs, which in turn leads to distortion of the actual charging voltage of the pixel and asymmetry of positive and negative polarity voltages, resulting in display defects such as cross-talk and afterimages

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