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US 11,688,360 B2Granted
Overcurrent protection circuit and display drive device
AssigneeHkc Corporation Limited
InventorXiaoyu Huang
Life of this patent
Estimating the term…
Abstract
An overcurrent protection circuit and display drive device, comprising: when input current of a front end corresponding to a logic signal experiences overcurrent, preventing the input current of the front end experiencing overcurrent from being transmitted to a drive chip, thereby preventing damage to the drive chip.
Claims18
An overcurrent protection circuit, comprising:
- a voltage generation module;
- a voltage comparison module;
- a controlled switch module;
- and
- a bias resistor,
- wherein a first input end of the voltage comparison module is configured to access a logic signal, a second input end of the voltage comparison module is configured to access the logic signal via the voltage generation module, and an output end of the voltage comparison module is connected to a controlled end of the controlled switch module,
- wherein an input end of the controlled switch module is configured to access the logic signal, and an output end of the controlled switch module is configured to be connected to an input end of a driver chip, wherein the controlled switch module comprises P-channel field effect transistor, the controlled end of the controlled switch module is a gate electrode of the P-channel field effect transistor, the input end of the controlled switch module is a source electrode of the P-channel field effect transistor, the output end of the controlled switch module is a drain electrode of the P-channel field effect transistor, and the gate electrode of the P-channel field effect transistor is connected to the source electrode of the P-channel field effect transistor via the bias resistor, and
- wherein the voltage comparison module is configured to control the controlled switch module to be turned on with conduction between the input end and the output end of the controlled switch module through the controlled end when a voltage at the first input end is the same as a voltage at the second input end, and to control the controlled switch module to be turned off with no conduction between the input end and the output end of the controlled switch module through the controlled end when the voltage at the first input end is not the same as the voltage at the second input end.
5 more elements
A display driving device, comprising:
- a driver chip;
- and
- an overcurrent protection circuit, comprising a voltage generation module, a voltage comparison module a controlled switch module, and a bias resistor,
- wherein a first input end of the voltage comparison module is configured to access a logic signal, a second input end of the voltage comparison module is configured to access the logic signal via the voltage generation module, and an output end of the voltage comparison module is connected to a controlled end of the controlled switch module,
- wherein an input end of the controlled switch module is configured to access the logic signal, and an output end of the controlled switch module is configured to connect to an input end of the driver chip, wherein the controlled switch module comprises P-channel field effect transistor, the controlled end of the controlled switch module is a gate electrode of the P-channel field effect transistor, the input end of the controlled switch module is a source electrode of the P-channel field effect transistor, the output end of the controlled switch module is a drain electrode of the P-channel field effect transistor, and the gate electrode of the P-channel field effect transistor is connected to the source electrode of the P-channel field effect transistor via the bias resistor,
- wherein the voltage comparison module is configured to control the controlled switch module to be turned on with conduction between the input end and the output end of the controlled switch module through the controlled end when a voltage at the first input end is the same as a voltage at the second input end, and to control the controlled switch module to be turned off with no conduction between the input end and the output end of the controlled switch module through the controlled end when the voltage at the first input end is not the same as the voltage at the second input end, and
- wherein an output end of the driver chip is configured to output a driving signal to a display array of a liquid crystal display panel.
4 more elements
A display device, comprising:
- a display driving device, comprising a driver chip and an overcurrent protection circuit;
- a backlight panel;
- and
- a display array,
- wherein the overcurrent protection circuit comprises a voltage generation module, a voltage comparison module a controlled switch module, and a bias resistor,
- wherein a first input end of the voltage comparison module is configured to access a logic signal, a second input end of the voltage comparison module is configured to access the logic signal via the voltage generation module, and an output end of the voltage comparison module is connected to a controlled end of the controlled switch module,
- wherein an input end of the controlled switch module is configured to access the logic signal, and an output end of the controlled switch module is configured to connect to an input end of the driver chip, wherein the controlled switch module comprises P-channel field effect transistor, the controlled end of the controlled switch module is a gate electrode of the P-channel field effect transistor, the input end of the controlled switch module is a source electrode of the P-channel field effect transistor, the output end of the controlled switch module is a drain electrode of the P-channel field effect transistor, and the gate electrode of the P-channel field effect transistor is connected to the source electrode of the P-channel field effect transistor via the bias resistor,
- wherein the voltage comparison module is configured to control the controlled switch module to be turned on with conduction between the input end and the output end of the controlled switch module through the controlled end when a voltage at the first input end is the same as a voltage at the second input end, and to control the controlled switch module to be turned off with no conduction between the input end and the output end of the controlled switch module through the controlled end when the voltage at the first input end is not the same as the voltage at the second input end,
- wherein an output end of the driver chip is configured to output a driving signal to the display array, and
- wherein the backlight panel is configured to provide a light source for the display array.
7 more elements
Dependencies are inferred from the claim text.