Touch display apparatus, driving circuit, and driving method

A driving circuit for driving a touch display apparatus, wherein the touch display apparatus comprises:

• a first substrate;
• a second substrate arranged opposite to the first substrate, wherein gate lines, data lines and thin film transistors are arranged on a surface of the second substrate facing towards the first substrate;
• a liquid crystal layer arranged between the first substrate and the second substrate;
• and a common electrode arranged between the first substrate and the second substrate and used as a touch sensing electrode during a touch sensing stage;
• wherein the driving circuit comprises:
• a first driving module configured to provide a first signal to the common electrode for realizing touch detection during the touch sensing stage;
• a second driving module configured to provide a second signal to the gate line during the touch sensing stage, wherein the second signal is used to control the thin film transistor to be switched off and is used to decrease charge and discharge capacity of a capacitor formed by the common electrode and the gate line;
• and
• a third driving module configured to provide a third signal during the touch sensing stage,
• wherein the third signal is used to decrease charge and discharge capacity of a capacitor formed by the common electrode and the data line,
• wherein the second signal is a pulse signal with a same frequency and a same phase as the first signal, but has a different voltage level from the first signal, or the second signal is a pulse signal with a same frequency, a same phase, and a same amplitude as the first signal, but has a different voltage level from the first signal;
• wherein the driving circuit provides the third signal to the data line, and the third signal is a pulse signal with a same frequency, a same phase, and a same voltage level as the first signal, or the third signal is a pulse signal with a same frequency, a same phase, a same voltage level, and a same amplitude as the first signal;
• and
• wherein the first signal, the second signal or the third signal is a square signal, a sine wave signal or a stair-step signal.

A driving method for driving a touch display apparatus, wherein the touch display apparatus comprises:

• a first substrate;
• a second substrate arranged opposite to the first substrate, wherein gate lines, data lines and thin film transistors are arranged on a surface of the second substrate facing towards the first substrate;
• a liquid crystal layer arranged between the first substrate and the second substrate;
• and a common electrode arranged between the first substrate and the second substrate and used as a touch sensing electrode during a touch sensing stage;
• wherein the driving method comprises:
• providing a driving signal to the plurality of gate lines sequentially, providing a display signal to the data line, and providing a common voltage signal to a plurality of electrode units of the common electrode, during a display stage;
• providing a first signal to the common electrode for realizing touch detection during the touch sensing stage;
• providing a second signal to the gate line in the process of providing the first signal to the common electrode, wherein the second signal is used to control the thin film transistor to be switched off and is used to decrease charge and discharge capacity of a capacitor formed by the common electrode and the gate line;
• and
• providing a third signal in the process of providing the first signal to the common electrode,
• wherein the third signal is used to decrease charge and discharge capacity of a capacitor formed by the common electrode and the data line,
• wherein the second signal is a pulse signal with a same frequency and a same phase as the first signal, but has a different voltage level from the first signal, or the second signal is a pulse signal with a same frequency, a same phase, and a same amplitude as the first signal, but has a different voltage level from the first signal;
• wherein the driving circuit provides the third signal to the data line, and the third signal is a pulse signal with a same frequency, a same phase, and a same voltage level as the first signal, or the third signal is a pulse signal with a same frequency, a same phase, a same voltage level, and a same amplitude as the first signal;
• and
• wherein the first signal, the second signal or the third signal is a square signal, a sine wave signal or a stair-step signal.