Touch display apparatus and shift register thereof

A touch display apparatus, comprising:

• a sensing driver outputting a plurality of touch scan signals to drive a touch panel according to a touch-enable signal;
• and
• a display driver outputting a plurality of display scan signals to drive a display panel according to a plurality of clock signals and a touch-stop signal, wherein when the touch-enable signal is enabled, the clock signals and the touch-stop signal are disabled, and when the touch-stop signal is enabled, the clock signals and the touch-enable signal are disabled, wherein the display driver has multi-stage shift register circuits connected to each other, and each of the shift register circuits comprises:
• a driving unit electrically connected to a driving node and outputting a first scan signal to an output end according to a first clock signal;
• a pull up unit outputting a driving voltage to the driving node according to one of a second scan signal and a third scan signal;
• a pull down unit electrically connected to the output end and a voltage source, being configured to pull down an output end voltage level of the output end according to a second clock signal;
• a pull down control unit electrically connected to the driving node, the output end, and the first voltage source, for controlling the output end voltage level and a driving node voltage level the driving node according to the first clock signal;
• and
• a reset unit electrically connected between the driving node and the first voltage source, for pulling down the driving node voltage level when the touch-enable signal is enabled;
• wherein the driving node is charged according to the touch-stop signal.

A scan driving method adapted to a shift register circuit, wherein said shift register circuit comprises

• a driving unit electrically connected to a driving node and outputting a first scan signal to an output end according to a first clock signal;
• a pull up unit outputting a driving voltage to the driving node according to one of a second scan signal and a third scan signal;
• a pull down unit, electrically connected to the output end and a first voltage source, for pulling down an output end voltage level of the output end according to a second clock signal, wherein the first clock signal and the second clock signal are complementary periodic signals, and the first voltage source is a power source having a constant low voltage level;
• a pull down control unit, electrically connected to the driving node, the output end, and the first voltage source, for controlling the output end voltage level and a driving node voltage level of the driving node according to the first clock signal;
• a reset unit, electrically connected between the driving node and the first voltage source, for pulling down the driving node voltage level according to a touch-enable signal;
• and
• an electric storage unit, electrically connected to the driving node, for adjusting the driving node voltage level according to a touch-stop signal;
• wherein the electric storage unit further comprises:
• a first switch having a first end, a second end and a gate end, wherein the first end of the first switch is configured to receive the touch-stop signal, the second end of the first switch is connected to a first node, and the gate end of the first switch is connected to a second node;
• a second switch having a first end, a second end and a gate end, wherein the first end of the second switch is electrically connected to the first node, the second end of the second switch is electrically connected to the driving node, and the gate end of the second switch is configured to receive the touch-stop signal, wherein when the touch-enable signal is enabled, the first clock signal, the second clock signal and the touch-stop signal are disabled, and when the touch-stop signal is enabled, the first clock signal, the second clock signal and the touch-enable signal are disabled;
• a first capacitor electrically connected between the first node and the second node;
• and
• a charging unit electrically connected to the gate end of the first switch and charging the second node according to a control signal,
• the driving method comprising:
• in a first period of time, providing the second clock signal to the shift register, such that the second node and the driving node have a high voltage level, and outputting the second scan signal;
• in a second period of time, providing the touch-enable signal to the shift register, and disabling the clock signals, to pull down the driving node to a low voltage level, maintain the second node at the high voltage level, and pull down the first node to the low voltage level;
• in a third period of time, providing the touch-stop signal to the shift register, and disabling the touch-enable signal and the clock signals, to raise the driving node, the first node and the second node to the high voltage level;
• and
• in a fourth period of time, providing the clock signals to the shift register, and disabling the touch-enable signal and the touch-stop signal, to output the first scan signal.