Pixel circuit, display device and driving method

A driving method for a pixel circuit, the pixel circuit comprising:

• a liquid crystal capacitor having a first end and a second end;
• a selection unit having a first end, a second end, and an output end, wherein the first end of the selection unit is configured to receive a column control signal, the second end of the selection unit is configured to receive a row control signal, and the selection unit is configured to determine whether to charge the liquid crystal capacitor according to the row control signal and the column control signal;
• a gray scale writing unit having a first end, a second end, and an output end, wherein the first end of the gray scale writing unit is connected to the output end of the selection unit, and the second end of the gray scale writing unit is connected to a gray scale voltage signal, the output end of the gray scale writing unit is connected to the second end of the liquid crystal capacitor, and the gray scale writing unit is configured to, when the selection unit determines to charge the liquid crystal capacitor, apply the gray scale voltage signal to the liquid crystal capacitor, and a gray scale level displayed by the liquid crystal capacitor is controlled by an application duration of the gray scale voltage signal control;
• and
• a reset unit having a first end, a second end, a third end, and a fourth end, wherein the first end of the reset unit is connected to a reset signal end, the second end of the reset unit is connected to the output end of the selection unit, and the third end of the reset unit is connected to the output end of the gray scale writing unit, the fourth end of the reset unit is connected to a common voltage signal, and the reset unit is configured to disconnect the gray scale writing unit and the liquid crystal capacitor to stop charging the liquid crystal capacitor upon receiving the reset signal end, and reset voltage of the liquid crystal capacitor to an initial state,
• wherein the driving method comprises:
• determining whether to charge the liquid crystal capacitor according to the row control signal and the column control signal;
• and
• applying the gray scale voltage signal to the liquid crystal capacitor when determining to charge the liquid crystal capacitor;
• wherein the gray scale level of the liquid crystal capacitor is determined by the application duration of the gray scale voltage signal.