Common voltage compensation circuit, compensation method, display panel and display device

Abstract

The invention discloses a common voltage compensation circuit, a compensation method, a display panel and a display device. The common voltage compensation circuit converts a common voltage analog signal of a sampling point to a digital signal sampling value via a first conversion module; according to the sampling value, a standard value generated by a decoding module, the preset gain times and the compensation times, through calculation, a processing module determines a signal for common voltage compensation, the compensation signal is thus converted to an analog quantity through a second conversion module, the analog quantity is outputted to a compensation point, real-time common voltage compensation on the display panel is thus realized, and as for a compensation point in a different area, a different compensation value is determined and compensation is carried out; and the common voltage signal adopts a digital quantity through a data bus during a transmission process to be transmitted to the decoding module, accuracy of the common voltage signal value in the case of long-distance transmission can be ensured, the common voltage signal analog quantity is converted into the digital quantity, calculation and comparison are easy to realize, and the design implementation and the operation of the common voltage compensation circuit are facilitated.

Description

Technical field [0001] The present invention relates to the field of display technology, and in particular to a common voltage compensation circuit, a compensation method, a display panel and a display device. Background technique [0002] In the prior art, the voltage Vcom on the common electrode of the liquid crystal panel will change instantaneously with the screen switching. Especially in some specific display screens, Vcom deviates from the initial standard voltage value very seriously. In order to solve the problem of voltage deviation . The technical means used in the prior art is to connect some sampling points of the liquid crystal panel back to the timing controller through wires, and use an operational amplifier in the timing controller to output a voltage signal that is inverted from the input, and then connect back through wires to be compensated Position, so as to realize the deviation compensation of the common voltage. The above-mentioned public voltage compensa...

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Problems solved by technology

The above-mentioned common voltage compensation technical solution can realize direct voltage compensation, but because the transmission lines are all analog signal quantities, and the analog signal quantities will be lost along with the transmission line transmission, and the analog signal quantities have poor anti-interference ability, so after long-distance The transmission of the analog signal used to compensate the common voltage will be lost, especially with the development of large-size display panels, the above-mentioned compensation scheme is adopted for large-size LCD screens (above 65 inches), because the amount of compensated analog signals along with the transmission line loss, the compensation effect is poor, which ultimately affects the display effect of the display screen

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