CN-122024606-A - Driving chip, current detection method and display device

CN122024606ACN 122024606 ACN122024606 ACN 122024606ACN-122024606-A

Abstract

The embodiment of the invention discloses a driving chip, a current detection method and a display device, wherein the driving chip comprises a control module, a current detection module, a feedback output module and a power module, a first end of the current detection module is connected with a detection control end of the control module, a first end of the feedback output module is connected with an indication signal output end of the control module, each voltage output end of the power module is connected with a second end of the current detection module, a third end of the current detection module and a second end of the feedback output module are connected with a detection end of the control module, the control module is used for controlling the current detection module to collect current detection signals of each voltage output end of the power module and generate current specification indication signals according to each current detection signals, and the feedback output module is used for generating current abnormal indication signals or current normal indication signals according to each current detection signals and current specification indication signals so as to realize real-time monitoring of current of each voltage of the power supply.

Inventors

WU ERPING

Assignees

昆山龙腾光电股份有限公司

Dates

Publication Date: 20260512
Application Date: 20260317

Claims (10)

1. The driving chip is characterized by comprising a control module, a current detection module, a feedback output module and a power supply module; the first end of the current detection module is connected with the detection control end of the control module, the first end of the feedback output module is connected with the indication signal output end of the control module, each voltage output end of the power supply module is connected with the second end of the current detection module, and the third end of the current detection module and the second end of the feedback output module are connected with the detection end of the control module; The control module is used for controlling the current detection module to collect current detection signals of each voltage output end of the power supply module and generate current specification indication signals according to each current detection signal, and the feedback output module is used for generating current abnormality indication signals or current normal indication signals according to each current detection signal and each current specification indication signal.
2. The driver chip of claim 1, wherein the current detection module comprises a plurality of current detection units; the detection end of the control module comprises a plurality of detection receiving ends; The first end of each current detection unit is connected with the detection control end, the second end of each current detection unit is connected with one voltage output end of the power supply module, and the third end of each current detection unit is connected with one detection receiving end.
3. The driving chip of claim 2, wherein the current detection unit comprises a load resistor, a sampling resistor, a first resistor, a second resistor, a third resistor, a fourth resistor, a first operational amplifier and a first transistor, wherein the resistance values of the fourth resistor and the third resistor are equal, and the resistance values of the first resistor and the second resistor are equal; The control end of the first transistor is used as the first end of the current detection unit, the first end of the load resistor is used as the second end of the current detection unit, the second end of the load resistor and the first end of the sampling resistor are both connected with the first end of the first resistor, the second end of the sampling resistor and the first end of the second resistor are both connected with the first pole of the first transistor, the second end of the first transistor is grounded, the second end of the first resistor and the first end of the third resistor are connected with the positive input end of the first operational amplifier, the second end of the third resistor is grounded, the second end of the second resistor and the first end of the fourth resistor are both connected with the negative input end of the first operational amplifier, the first power end of the first operational amplifier is connected with a first potential, the second power end of the first operational amplifier is connected with a second potential, and the output end of the first operational amplifier and the fourth end of the fourth resistor are connected as the third end of the current detection unit.
4. The driver chip of claim 2, wherein the feedback output module comprises a plurality of feedback output units; The first end of each feedback output unit is connected with the third end of one current detection unit, and the second end of each feedback output unit is connected with the indication signal output end.
5. The driver chip of claim 4, wherein the feedback output unit comprises a second operational amplifier, an or gate, a fifth resistor, and a second transistor; The positive input end of the second operational amplifier is used as the first end of the feedback output unit, the negative input end of the second operational amplifier is connected with a reference potential, the first power end of the second operational amplifier and the first end of the fifth resistor are both connected with a third potential and used as the output end of the feedback output unit, the second power end of the second operational amplifier is connected with a fourth potential, the output end of the second operational amplifier is connected with the first input end of the OR gate, the second input end of the OR gate is used as the second end of the feedback output unit, the output end of the OR gate is connected with the control end of the second transistor, the second end of the fifth resistor is connected with the first pole of the second transistor, and the second pole of the second transistor is grounded.
6. The drive chip 4 as claimed in claim 1, further comprising a register, a scan signal output module, a data signal output module, an output buffer, and a low voltage differential signal receiver; The register, the scanning signal output module, the data signal output module, the output buffer and the low-voltage differential signal receiver are all connected with the control module, and the data signal output module is connected with the output buffer.
7. A current detection method, characterized in that it is performed using the driving chip according to any one of claims 1 to 6; The current detection method comprises the following steps: The control module controls the current detection module to collect current detection signals of each voltage output end of the power supply module and generates current specification indication signals according to each current detection signal; The feedback output module generates a current abnormality indication signal or a current normal indication signal according to each current detection signal and the current specification indication signal.
8. The method of claim 7, wherein the driver chip further comprises a register, the register being coupled to the control module; Before the control module controls the current detection module to collect the current detection signal of each voltage output end of the power module, the method further comprises the following steps: the control module reads a function enabling bit of a current detection function control register in the register to determine whether a current detection function is in an enabling state; If the current detection function is in an enabling state, the control module outputs a detection starting signal so that the current detection module acquires a current detection signal of each voltage output end of the power supply module; And if the current detection function is in an disabled state, the control module outputs a detection closing signal so that the current detection module stops collecting the current detection signal of each voltage output end of the power supply module.
9. The current detection method according to claim 8, wherein the current specification indication signal includes a current overstatic indication signal and a current non-overstatic indication signal; The control module generates a current specification indication signal according to each current detection signal, and the control module comprises: The control module reads a current threshold value stored in a current threshold value register in the register; the control module calculates a detection current value corresponding to each voltage output end according to each current detection signal; the control module judges the magnitude of each detected current value and the magnitude of the current threshold value to obtain a first comparison result, and generates a current overstatic indication signal or a current non-overstatic indication signal according to the first comparison result.
10. A display device comprising the driver chip according to any one of claims 1 to 6.

Description

Driving chip, current detection method and display device Technical Field The embodiment of the invention relates to the technical field of display panels, in particular to a driving chip, a current detection method and a display device. Background The current of each path of voltage of the existing vehicle-mounted module can be larger due to certain abnormality in long-time use, so that the vehicle-mounted module fails. For example, when the driving chip is sealed, a conductive path is formed by the contact of the negative Gate current (VGL) circuit of the driving chip with the anisotropic conductive adhesive particles, so that the negative Gate Voltage is short-circuited with the peripheral potential (GND/VGH/AVDD/Gate line), and the negative Gate current is larger and lower, thereby causing the vehicle-mounted module to display the faults of residual shadow, vertical line, screen, driving chip heating, screen burning and the like. Disclosure of Invention The embodiment of the invention provides a driving chip, a current detection method and a display device, which are used for realizing real-time monitoring of the current of each path of voltage of a power supply and locking the abnormal condition of the current of the power supply in time. In a first aspect, an embodiment of the present invention provides a driving chip, where the driving chip includes a control module, a current detection module, a feedback output module, and a power module; the first end of the current detection module is connected with the detection control end of the control module, the first end of the feedback output module is connected with the indication signal output end of the control module, each voltage output end of the power supply module is connected with the second end of the current detection module, and the third end of the current detection module and the second end of the feedback output module are connected with the detection end of the control module; The control module is used for controlling the current detection module to collect current detection signals of each voltage output end of the power supply module and generate current specification indication signals according to each current detection signal, and the feedback output module is used for generating current abnormality indication signals or current normal indication signals according to each current detection signal and each current specification indication signal. Optionally, the current detection module includes a plurality of current detection units; the detection end of the control module comprises a plurality of detection receiving ends; The first end of each current detection unit is connected with the detection control end, the second end of each current detection unit is connected with one voltage output end of the power supply module, and the third end of each current detection unit is connected with one detection receiving end. Optionally, the current detection unit comprises a load resistor, a sampling resistor, a first resistor, a second resistor, a third resistor, a fourth resistor, a first operational amplifier and a first transistor, wherein the resistance values of the fourth resistor and the third resistor are equal, and the resistance values of the first resistor and the second resistor are equal; The control end of the first transistor is used as the first end of the current detection unit, the first end of the load resistor is used as the second end of the current detection unit, the second end of the load resistor and the first end of the sampling resistor are both connected with the first end of the first resistor, the second end of the sampling resistor and the first end of the second resistor are both connected with the first pole of the first transistor, the second end of the first transistor is grounded, the second end of the first resistor and the first end of the third resistor are connected with the positive input end of the first operational amplifier, the second end of the third resistor is grounded, the second end of the second resistor and the first end of the fourth resistor are both connected with the negative input end of the first operational amplifier, the first power end of the first operational amplifier is connected with a first potential, the second power end of the first operational amplifier is connected with a second potential, and the output end of the first operational amplifier and the fourth end of the fourth resistor are connected as the third end of the current detection unit. Optionally, the feedback output module includes a plurality of feedback output units; The first end of each feedback output unit is connected with the third end of one current detection unit, and the second end of each feedback output unit is connected with the indication signal output end. Optionally, the feedback output unit includes a second operational amplifier, an or gate, a fifth resistor, and a second transistor; The positi