Driver IC, display panel and driving method of the display panel
View Patent ↗Embodiments of the present disclosure provide a driver IC, a display panel and a driving method of the display panel. The driver IC includes a fast discharge circuit, and the fast discharge circuit includes an access port for accessing a fast discharge signal, a judgment sub-circuit, a buffer sub-circuit and a power-off sub-circuit. The judgment sub-circuit generates a judgment signal according to a target signal within a preset time in response to a falling edge of the fast discharge signal; the buffer sub-circuit generates a control signal and sends the control signal to the power-off sub-circuit in response to the judgment signal; and the power-off sub-circuit controls the driver IC to perform or not to perform a power-off operation in response to the control signal.
1 . A driver IC, comprising a fast discharge circuit, wherein the fast discharge circuit comprises:
an access port, configured to access a fast discharge signal; wherein the fast discharge signal is used to indicate that the driver IC is powered off;
a sensing sub-circuit, connected to the access port and a power supply voltage, and configured to sense a falling edge of the fast discharge signal;
a buffer sub-circuit, connected to the sensing sub-circuit, a judgment sub-circuit and a power-off sub-circuit, and configured to generate a control signal and send the control signal to the power-off sub-circuit in response to a judgment signal output by the judgment sub-circuit within a preset time after the sensing sub-circuit senses the falling edge of the fast discharge signal;
the judgment sub-circuit, connected to the buffer sub-circuit, and configured to generate the judgment signal according to a state of a target signal within the preset time, and send the judgment signal to the buffer sub-circuit; and
the power-off sub-circuit, connected to the buffer sub-circuit, and configured to control the driver IC to perform or not to perform a power-off operation in response to the control signal.
2 . The driver IC according to claim 1 , wherein the judgment sub-circuit is further configured to:
generate a first judgment signal and send the first judgment signal to the buffer sub-circuit in response to a rising edge of the target signal within the preset time.
3 . The driver IC according to claim 2 , wherein the judgment sub-circuit is further configured to:
generate the first judgment signal and send the first judgment signal to the buffer sub-circuit in response to a rising edge of the fast discharge signal within the preset time; or
generate the first judgment signal and send the first judgment signal to the buffer sub-circuit in response to a rising edge of a scan driver start pulse signal within the preset time; wherein the scan driver start pulse signal is used to indicate that an image signal frame starts to be transmitted.
4 . The driver IC according to claim 2 ,
wherein the buffer sub-circuit is further configured to:
generate a first control signal and send the first control signal to the power-off sub-circuit in response to the first judgment signal within the preset time; and
the power-off sub-circuit is further configured to:
control the driver IC not to perform the power-off operation in response to the first control signal.
5 . The driver IC according to claim 1 , wherein the judgment sub-circuit is further configured to:
generate a second judgment signal and send the second judgment signal to the buffer sub-circuit in response to a continuous low-level state of the target signal within the preset time.
6 . The driver IC according to claim 5 , wherein the judgment sub-circuit is further configured to:
generate the second judgment signal and send the second judgment signal to the buffer sub-circuit in response to a continuous low-level state of the fast discharge signal within the preset time; or
generate the second judgment signal and send the second judgment signal to the buffer sub-circuit in response to a continuous low-level state of a scan driver start pulse signal within the preset time; wherein the scan driver start pulse signal is used to indicate that an image signal frame starts to be transmitted.
7 . The driver IC according to claim 5 ,
wherein the buffer sub-circuit is further configured to:
generate a second control signal and send the second control signal to the power-off sub-circuit in response to the second judgment signal within the preset time; and
the power-off sub-circuit is further configured to:
control the driver IC to perform the power-off operation in response to the second control signal.
8 . The driver IC according to claim 1 , wherein the driver IC is applicable to a China Standard Point to Point Interface transmission protocol.
9 . The driver IC according to claim 1 , wherein the fast discharge circuit further comprises:
an electrostatic protection sub-circuit, connected to the access port and the sensing sub-circuit, and configured to perform an electrostatic discharge on the driver IC.
10 . The driver IC according to claim 9 , wherein the electrostatic protection sub-circuit comprises:
a diode, comprising a positive electrode connected to a preset low potential and a negative electrode connected to the access port and the sensing sub-circuit; and
a transistor, comprising a control electrode connected to the preset low potential, a first electrode connected to the preset low potential, and a second electrode connected to the access port and the sensing sub-circuit.
11 . The driver IC according to claim 1 , wherein the power-off sub-circuit comprises:
a latch unit, configured to generate a latch signal and send the latch signal to a power-off unit in response to the control signal; and
the power-off unit, configured to perform or not to perform the power-off operation in response to the latch signal.
12 . A display panel, comprising a driver IC, and the driver IC comprising a fast discharge circuit; wherein the fast discharge circuit comprises:
an access port, configured to access a fast discharge signal; wherein the fast discharge signal is used to indicate that the driver IC is powered off;
a sensing sub-circuit, connected to the access port and a power supply voltage, and configured to sense a falling edge of the fast discharge signal;
a buffer sub-circuit, connected to the sensing sub-circuit, a judgment sub-circuit and a power-off sub-circuit, and configured to generate a control signal and send the control signal to the power-off sub-circuit in response to a judgment signal output by the judgment sub-circuit within a preset time after the sensing sub-circuit senses the falling edge of the fast discharge signal;
the judgment sub-circuit, connected to the buffer sub-circuit, and configured to generate the judgment signal according to a state of a target signal within the preset time, and send the judgment signal to the buffer sub-circuit; and
the power-off sub-circuit, connected to the buffer sub-circuit, and configured to control the driver IC to perform or not to perform a power-off operation in response to the control signal.
13 . A driving method of a display panel, applied to a driver IC, wherein the driver IC comprises a fast discharge circuit, and the fast discharge circuit comprises an access port for accessing a fast discharge signal, a judgment sub-circuit, a buffer sub-circuit and a power-off sub-circuit, and the driving method comprises:
generating, by the judgment sub-circuit, a judgment signal according to a target signal within a preset time in response to a falling edge of the fast discharge signal;
generating, by the buffer sub-circuit, a control signal and sending the control signal to the power-off sub-circuit in response to the judgment signal; and
controlling, by the power-off sub-circuit, the driver IC to perform or not to perform a power-off operation in response to the control signal.
14 . The driving method of the display panel according to claim 13 , wherein generating, by the judgment sub-circuit, the judgment signal according to the target signal within the preset time in response to the falling edge of the fast discharge signal comprises:
generating, by the judgment sub-circuit, a first judgment signal and sending the first judgment signal to the buffer sub-circuit in response to a rising edge of the target signal within the preset time.
15 . The driving method of the display panel according to claim 14 , wherein generating, by the judgment sub-circuit, the first judgment signal and sending the first judgment signal to the buffer sub-circuit in response to the rising edge of the target signal within the preset time comprises:
generating, by the judgment sub-circuit, the first judgment signal and sending the first judgment signal to the buffer sub-circuit in response to a rising edge of the fast discharge signal within the preset time; or
generating, by the judgment sub-circuit, the first judgment signal and sending the first judgment signal to the buffer sub-circuit in response to a rising edge of a scan driver start pulse signal within the preset time; wherein the scan driver start pulse signal is used to indicate that an image signal frame starts to be transmitted.
16 . The driving method of the display panel according to claim 14 , wherein the driving method further comprises:
generating, by the buffer sub-circuit, a first control signal and sending the first control signal to the power-off sub-circuit in response to the first judgment signal within the preset time; and
controlling, by the power-off sub-circuit, the driver IC not to perform the power-off operation in response to the first control signal.
17 . The driving method of the display panel according to claim 13 , wherein generating, by the judgment sub-circuit, the judgment signal according to the target signal within the preset time in response to the falling edge of the fast discharge signal comprises:
generating, by the judgment sub-circuit, a second judgment signal and sending the second judgment signal to the buffer sub-circuit in response to a continuous low-level state of the target signal within the preset time.
18 . The driving method of the display panel according to claim 17 , wherein generating, by the judgment sub-circuit, the second judgment signal and sending the second judgment signal to the buffer sub-circuit in response to the continuous low-level state of the target signal within the preset time comprises:
generating, by the judgment sub-circuit, the second judgment signal and sending the second judgment signal to the buffer sub-circuit in response to a continuous low-level state of the fast discharge signal within the preset time; or
generating, by the judgment sub-circuit, the second judgment signal and sending the second judgment signal to the buffer sub-circuit in response to a continuous low-level state of a scan driver start pulse signal within the preset time; wherein the scan driver start pulse signal is used to indicate that an image signal frame starts to be transmitted.
19 . The driving method of the display panel according to claim 17 , wherein the driving method further comprises:
generating, by the buffer sub-circuit, a second control signal and sending the second control signal to the power-off sub-circuit in response to the second judgment signal within the preset time; and
controlling, by the power-off sub-circuit, the driver IC to perform the power-off operation in response to the second control signal.
20 . The driving method of the display panel according to claim 13 , wherein the driving method is applicable to a China Standard Point to Point Interface transmission protocol.