Liquid crystal display device including common electrode control circuit

A liquid crystal display device comprising:

• a liquid crystal panel having a common electrode and formed using oxide semiconductor;
• a power supply control circuit configured to output a control signal which becomes an active level in a period set after power off, and a power supply voltage which is kept at an operation level even after power off until a middle of the period;
• and
• a common electrode control circuit configured to connect the common electrode to a ground when the control signal is at the active level and the power supply voltage is at the operation level, wherein
• the common electrode control circuit includes:
• a first resistor having one end to which the power supply voltage is supplied and another end connected to a first node;
• a second resister having one end connected to the first node and another end connected to the ground;
• a NOT circuit configured to output an inverted signal of the control signal;
• a first transistor having a first conduction terminal connected to the first node, a second conduction terminal connected to the ground, and a control terminal to which the inverted signal is supplied;
• and
• a second transistor having a first conduction terminal connected to the common electrode, a second conduction terminal connected to the ground, and a control terminal connected to the first node.