Vcom adjusting method and device for liquid crystal panel

Abstract

The invention relates to a Vcom adjusting method and device for a liquid crystal panel. The Vcom adjusting method for the liquid crystal panel comprises the following steps of: 1, partitioning the liquid crystal panel into a plurality of regions, wherein each region corresponds to a logical operation module; 2, supplying initial data by using a time sequence controller and the logical operation modules in a matched way; 3, making a corresponding logical operation module obtain the liquid crystal capacitance charging voltage of a corresponding region; 4, performing logical processing through the logical operation modules to obtain a positive voltage and a negative voltage; 5, transmitting the positive voltage and the negative voltage to a power supply module; and 6, calculating a common-electrode voltage Vcom needed by the liquid crystal panel by using the power supply module. According to the method and the device, Vcom can be adjusted to an optimal state under the condition that an LCD (Liquid Crystal Display) is in different environments.

Description

technical field [0001] The invention relates to the technical field of liquid crystal images, in particular to a method and device for adjusting Vcom of a liquid crystal panel. Background technique [0002] TFT (ThinFilmTransistor) - thin film field effect transistor, means that each liquid crystal pixel on the liquid crystal display is driven by a thin film transistor integrated behind it, so that high-speed, high-brightness and high-contrast display screen information can be achieved, common The TFT-LCD (Thin Film Transistor Liquid Crystal Display) is a type of most liquid crystal displays. Please refer to figure 1 , is the equivalent circuit of the entire TFT panel, where each TFT is connected in parallel with Clc (liquid crystal capacitor) and Cs (storage capacitor), representing a display point. A basic display unit, Pixel, needs three dots displayed in this way, representing the three primary colors of RGB respectively. When the panel is working, the scanning driver...

AI Technical Summary

Problems solved by technology

[0007] Second, according to the current LCD development trend, the adjustable rheostat will inevitably adopt a smaller package, which will inevitably bring inconvenience to the production personnel to adjust the Vcom voltage during mass production

Moreover, the Vcom voltage occupies a larger space than other components. If this component can be removed, the area of ​​the PCB can be reduced.

[0008] Third, the basis for judging whether the Vcom voltage is properly adjusted is that the specific screen does not flicker, and the judgment has personal subjective factors, so it may be due to individual differences among personnel that the Vcom voltage is not adjusted to the best state

[0009] Fourth, the adjustable rheostat is a mechanical knob, and the LCD may cause the Vcom voltage to shift during transportation

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