Electrostatic discharge protection chip and driving circuit
AssigneeShenzhen China Star Optoelectronics Technology Co., Ltd.
InventorXiaoyu HUANG
Life of this patent
Estimating the term…
Abstract
An electrostatic discharge protection chip is provided. The electrostatic discharge protection chip includes an electrostatic discharge module for discharging abnormal static electricity on the driver chip, and at least one detection module for detecting an equivalent resistor of the electrostatic discharge module in the driving circuit to determine whether the electrostatic discharge module is abnormal. The technical problems of the undetectable abnormal condition of the electrostatic discharge module, low functional efficiency, and high production cost are resolved.
Claims17
An electrostatic discharge protection chip disposed in a liquid crystal display device, the liquid crystal display device including a liquid crystal display panel and a driving circuit for driving the liquid crystal display panel, the driving circuit including a driving chip and a connector connected with the liquid crystal display panel, the electrostatic discharge protection chip comprising:
- an electrostatic discharge module for discharging abnormal static electricity on the driver chip;
- and
- at least one detection module for detecting an equivalent resistor of the electrostatic discharge module in the driving circuit to determine whether the electrostatic discharge module is abnormal,
- the electrostatic discharge protection chip being connected with the driving chip and the connector, respectively,
- wherein the detection module comprises a DC power source, a first resistor, a second resistor, a reference resistor, and a detection element,
- an end of the first resistor is connected with an anode of the DC power source, and the other end thereof is connected with an end of the equivalent resistor, and the other end of the equivalent resistor is connected with a cathode of the DC power source,
- an end of the second resistor is connected with the anode of the DC power source, the other end of the second resistor is connected with the reference resistor in series, and then connected with the cathode of the DC power source,
- an end of the detection element is connected between the equivalent resistor and the first resistor, the other end of the detection element is connected between the reference resistor and the second resistor, and the detection element determines whether the equivalent resistor is abnormal by detecting a voltage difference between the equivalent resistor and the reference resistor, wherein a ratio of the first resistor to the equivalent resistor is equal to a ratio of the second resistor to the reference resistor,
- wherein the first resistor is equal to the second resistor,
- wherein the reference resistor is a variable resistor.
An electrostatic discharge protection chip disposed in a liquid crystal display device, the liquid crystal display device including a liquid crystal display panel and a driving circuit for driving the liquid crystal display panel, the driving circuit including a driving chip and a connector connected with the liquid crystal display panel, the electrostatic discharge protection chip comprising:
- an electrostatic discharge module for discharging abnormal static electricity on the driver chip;
- and
- at least one detection module for detecting an equivalent resistor of the electrostatic discharge module in the driving circuit to determine whether the electrostatic discharge module is abnormal;
- the electrostatic discharge protection chip being connected with the driving chip and the connector, respectively.
A driving circuit, the driving circuit comprising a driving chip and a connector connected with the liquid crystal display panel, wherein the driving circuit further comprises an electrostatic discharge protection chip, and the electrostatic discharge protection chip comprises:
- an electrostatic discharge module for discharging abnormal static electricity on the driver chip;
- and
- at least one detection module for detecting an equivalent resistor of the electrostatic discharge module in the driving circuit to determine whether the electrostatic discharge module is abnormal;
- the electrostatic discharge protection chip being connected with the driving chip and the connector, respectively.
Dependencies are inferred from the claim text.