TWI837761B - Vehicle source driving circuit and operating method thereof - Google Patents

Abstract

A vehicle source driving circuit is disclosed. The vehicle source driving circuit includes a plurality of output channels and an output voltage detection circuit. The output channels are coupled to a vehicle display panel and used to output a plurality of output voltages to the vehicle display panel. The output voltage detection circuit includes a determination unit and a notification unit. The determination unit is coupled to the plurality of output channels and used to respectively detect the output voltages outputted by the output channels during a specific period and determine whether the output voltages are abnormal. The notification unit is coupled to the determination unit. If the determination result of the determination unit is yes, then the notification unit immediately outputs a notification signal to start a safe state to comply with specific specifications.

Description

Automotive source drive circuit and operation method thereof

The present invention relates to a source drive circuit, and more particularly to a vehicle source drive circuit and an operating method thereof.

In recent years, as the importance of automotive safety has been increasingly emphasized and the ISO26262 standard has become more popular, all automotive systems on the market are required to have functional safety as specified by ISO26262.

Please refer to Figure 1, which is a schematic diagram of the automotive source drive integrated circuit SIC applied to the automotive display panel PL. Generally speaking, in order to comply with the functional safety specified by ISO26262 and achieve hardware quantitative indicators (SPFM/LFM/PMHF) above ASIL B level, each functional module included in the automotive source drive integrated circuit SIC applied to the automotive display panel PL must have a redundant design or safety mechanism.

In the entire automotive display integrated circuit, the automotive source drive integrated circuit SIC usually occupies the largest area. In addition, once the automotive display integrated circuit has an abnormality (such as particles, EOS, ESD, etc.), it usually also causes the output of the automotive source drive integrated circuit SIC to be abnormal.

However, traditional automotive source-driven integrated circuits (SICs) do not have any output abnormality detection and notification mechanisms, which will directly violate safety goals and make it impossible to achieve the functional safety specified by ISO26262. Therefore, further improvement is urgently needed.

In view of this, the present invention proposes a vehicle source drive circuit and an operating method thereof to effectively solve the above-mentioned problems encountered by the prior art.

According to one specific embodiment of the present invention, a vehicle source drive circuit is provided. In this embodiment, the vehicle source drive circuit includes a plurality of output channels and an output voltage detection circuit. The plurality of output channels are coupled to a vehicle display panel to output a plurality of output voltages to the vehicle display panel. The output voltage detection circuit includes a determination module and a notification module. The determination module is coupled to the plurality of output channels to respectively detect the plurality of output voltages output by the plurality of output channels during a specific period and determine whether the plurality of output voltages are abnormal according to a preset output voltage range. The notification module is coupled to the determination module. If the judgment result of the judgment module is yes, the notification module immediately outputs a notification signal to activate the safety state to comply with specific regulations.

In one embodiment, the specific period refers to the time from when the vehicle source driving circuit is powered on to before the normal display period of the vehicle display panel, and a black picture or a white picture is inserted in the specific period.

In one embodiment, the specific period refers to a vertical blanking period (V-Blanking) within a normal display period of the vehicle display panel.

In one embodiment, the output voltage detection circuit further includes a plurality of switching modules, which are respectively coupled between the plurality of output channels and the determination module, and are used to sequentially switch part of the output channels to be coupled to the determination module according to a line shift signal.

In one embodiment, the determination module includes a first comparator for comparing the plurality of output voltages with a preset output voltage upper limit of a preset output voltage range. If at least one of the plurality of output voltages is higher than the preset output voltage upper limit, the determination module determines that the plurality of output voltages are abnormal.

In one embodiment, the determination module includes a second comparator for comparing the plurality of output voltages with a preset output voltage lower limit of a preset output voltage range. If at least one of the plurality of output voltages is lower than the preset output voltage lower limit, the determination module determines that the plurality of output voltages are abnormal.

In one embodiment, the notification module controls a specific pin through a timing controller to output a notification signal with a low level to the front-end system, thereby notifying the front-end system to make the vehicle source drive circuit enter a safe state.

In one embodiment, the notification module controls a specific pin through a timing controller to output a notification signal with a low level to the front-end system, thereby notifying the front-end system to make the vehicle source drive circuit enter a safe state.

In one embodiment, the specific standard is the ISO 26262 standard.

Another specific embodiment of the present invention is a method for operating a vehicle source drive circuit. In this embodiment, the method for operating a vehicle source drive circuit is used to operate a vehicle source drive circuit. The vehicle source drive circuit includes a plurality of output channels coupled to a vehicle display panel. The operating method of the automotive source drive circuit includes the following steps: (a) outputting a plurality of output voltages to the automotive display panel through the plurality of output channels; (b) detecting the plurality of output voltages output by the plurality of output channels respectively during a specific period; (c) determining whether the plurality of output voltages are abnormal according to a preset output voltage range; and (d) if the determination result of step (c) is yes, immediately outputting a notification signal to activate a safety state.

Compared with the prior art, the automotive source driver circuit and its operation method according to the present invention proposes a detection and notification mechanism for output abnormality of the automotive source driver circuit, so that when the automotive source driver circuit detects output abnormality, it can immediately notify the front-end system to enter a safe state to meet the safety goal, thereby achieving the functional safety of ISO26262 specification and the hardware quantitative indicators of ASIL level specification.

The advantages and spirit of the present invention can be further understood through the following detailed description of the invention and the attached drawings.

A specific embodiment of the present invention is a vehicle source driving circuit. In this embodiment, the vehicle source driving circuit can be applied to various different vehicle display devices to drive the vehicle display panel to display, but is not limited thereto.

First, please refer to FIG. 2A , which is a schematic diagram showing that a plurality of output channels of the vehicle source drive circuit in this embodiment are divided into a first part to a fourth part.

As shown in FIG2A , the vehicle source driving circuit SIC includes a plurality of output channels SOUT1 to SOUT2400 for respectively outputting a plurality of output voltages to the vehicle display panel. In practical applications, the plurality of output channels SOUT1 to SOUT2400 can be divided into a plurality of parts.

For example, if the output channels SOUT1~SOUT2400 are divided into the first part SA~the fourth part SD, the first part SA includes the output channels SOUT1~SOUT600, the second part SB includes the output channels SOUT601~SOUT1200, the third part SC includes the output channels SOUT1201~SOUT1800 and the fourth part SD includes the output channels SOUT1801~SOUT2400.

Next, please refer to FIG. 2B , which shows a schematic diagram of a vehicle source driver circuit using the fourth portion SD (ie, output channels SOUT1801 to SOUT2400 ) as an example.

As shown in FIG. 2B , the vehicle source driver circuit includes a source driver module 20 and an output voltage detection circuit 21. The source driver module 20 includes a fourth portion SD (i.e., a plurality of output channels SOUT1801 to SOUT2400). The source driver module 20 and the output voltage detection circuit 21 are coupled to each other. In practice, the plurality of output channels SOUT1801 to SOUT2400 can be coupled to a vehicle display panel to output a plurality of output voltages to the vehicle display panel.

In this embodiment, the source driving module 20 includes a plurality of pairs of first operational amplifiers POP and second operational amplifiers NOP, a plurality of output multiplexers OM1-OM300 and a plurality of output channels SOUT1801-SOUT2400.

Taking the first pair of the first operational amplifier POP and the second operational amplifier NOP as an example, an input terminal and an output terminal of the first operational amplifier POP are both coupled to an input terminal of the output multiplexer OM1, and an input terminal and an output terminal of the second operational amplifier NOP are both coupled to another input terminal of the output multiplexer OM1. The two output terminals of the output multiplexer OM1 are respectively coupled to two corresponding output channels SOUT1801 and SOUT1802.

Similarly, if the second pair of the first operational amplifier POP and the second operational amplifier NOP is taken as an example, an input terminal and an output terminal of the first operational amplifier POP are both coupled to an input terminal of the output multiplexer OM2, and an input terminal and an output terminal of the second operational amplifier NOP are both coupled to another input terminal of the output multiplexer OM2. The two output terminals of the output multiplexer OM2 are respectively coupled to two corresponding output channels SOUT1803 and SOUT1804.

By analogy, if the 300th pair of the first operational amplifier POP and the second operational amplifier NOP is taken as an example, an input terminal and an output terminal of the first operational amplifier POP are both coupled to an input terminal of the output multiplexer OM300, and an input terminal and an output terminal of the second operational amplifier NOP are both coupled to another input terminal of the output multiplexer OM300. The two output terminals of the output multiplexer OM300 are respectively coupled to two corresponding output channels SOUT2399 and SOUT2400.

In this embodiment, the output voltage detection circuit 21 includes a switching module 22, a polarity multiplexing module 24, a determination module 26 and a notification module 28. The switching module 22 is coupled to the source driving module 20. The polarity multiplexing module 24 is coupled to the switching module 22. The determination module 26 is coupled to the polarity multiplexing module 24. The notification module 28 is coupled to the determination module 26.

The switching module 22 includes a plurality of switching units SW1~SW600, which are respectively coupled between the plurality of output channels SOUT1801~SOUT2400 and the polarity multiplexing module 24, and are used to sequentially switch some of the plurality of output channels SOUT1801~SOUT2400 to be coupled to two input ends of the polarity multiplexing module 24 according to a line shift signal (Line shift signal) LSS.

For example, the switching module 22 can switch the odd-numbered switching units SW1, SW3, ..., SW599 of the plurality of switching units SW1~SW600 to be coupled to an input end of the polarity multiplexing module 24 according to the line shift signal LSS, and can switch the even-numbered switching units SW2, SW4, ..., SW600 of the plurality of switching units SW1~SW600 to be coupled to another input end of the polarity multiplexing module 24 according to the line shift signal LSS, but is not limited to this.

The polarity multiplexing module 24 is coupled between the switching module 22 and the determination module 26 to switch the coupling relationship between the plurality of switching units SW1~SW600 and the determination module 26 according to the polarity signal POL, so that the plurality of output voltages output by the plurality of output channels SOUT1801~SOUT2400 can be selectively transmitted to the determination module 26.

The determination module 26 is coupled between the polarity multiplexing module 24 and the notification module 28. The determination module 26 is used to perform a voltage range check during a specific period, for example, respectively detecting the plurality of output voltages output by the plurality of output channels SOUT1801~SOUT2400, and determining whether the plurality of output voltages are abnormal according to a preset output voltage range, and then outputting the determination result to the notification module 28. In actual applications, the preset output voltage range is between a preset output voltage upper limit and a preset output voltage lower limit.

Please refer to FIG3, which shows a timing diagram of a specific period for voltage range inspection. As shown in FIG3, after the vehicle source drive circuit is powered on, the first frame F1 and the second frame F2 before the normal display period of the vehicle display panel (starting from the fifth frame F5 when the backlight starts to start) can be inserted with a black picture and the third frame F3 and the fourth frame F4 can be inserted with a white picture. Then, the first frame F1, the second frame F2, the third frame F3 and the fourth frame F4 can all be the "specific period" for voltage range inspection, but not limited to this. In addition, the vertical blanking period (V-Blanking) within the normal display period of the automotive display panel (starting from the fifth frame F5 when the backlight starts to be activated) can also be the "specific period" for performing the voltage range check, but is not limited to this.

In this embodiment, the determination module 26 may include a plurality of comparators, such as the first comparator CP1 to the fourth comparator CP4 in FIG. 2B , but not limited thereto. As shown in FIG. 2B , if the preset output voltage range is between the preset output voltage upper limit VHTH and the preset output voltage lower limit VHTL, the positive input terminal + of the first comparator CP1 is coupled to the preset output voltage upper limit VHTH, the negative input terminal - of the first comparator CP1 and the positive input terminal + of the second comparator CP2 are both coupled to an output terminal of the polarity multiplexing module 24, and the negative input terminal - of the second comparator CP2 is coupled to the preset output voltage lower limit VHTL. The output terminals of the first comparator CP1 and the second comparator CP2 are both coupled to the notification module 28.

For the first comparator CP1, if the output voltage received by its negative input terminal - from the output terminal of the polarity multiplexer module 24 is higher than the preset output voltage upper limit VHTH received by its positive input terminal +, it means that the output voltage is outside the preset output voltage range, and the first comparator CP1 outputs the judgment result that the output voltage is abnormal to the notification module 28; if the output voltage received by its negative input terminal - from the output terminal of the polarity multiplexer module 24 is not higher than the preset output voltage upper limit VHTH, it means that the output voltage is still within the preset output voltage range, and the first comparator CP1 outputs the judgment result that the output voltage is not abnormal to the notification module 28.

For the second comparator CP2, if the output voltage received by its positive input terminal + from the output terminal of the polarity multiplexer module 24 is lower than the preset output voltage lower limit VHTL received by its negative input terminal -, it means that the output voltage is outside the preset output voltage range, and the second comparator CP2 outputs the judgment result that the output voltage is abnormal to the notification module 28; if the output voltage received by its positive input terminal + from the output terminal of the polarity multiplexer module 24 is not lower than the preset output voltage lower limit VHTL, it means that the output voltage is still within the preset output voltage range, and the second comparator CP2 outputs the judgment result that the output voltage is not abnormal to the notification module 28.

Similarly, if the preset output voltage range is between the preset output voltage upper limit VLTH and the preset output voltage lower limit VLTL, the positive input terminal + of the third comparator CP3 is coupled to the preset output voltage upper limit VLTH, the negative input terminal - of the third comparator CP3 and the positive input terminal + of the fourth comparator CP4 are both coupled to another output terminal of the polarity multiplexing module 24, and the negative input terminal - of the fourth comparator CP4 is coupled to the preset output voltage lower limit VLTL. The output terminals of the third comparator CP3 and the fourth comparator CP4 are both coupled to the notification module 28.

For the third comparator CP3, if the output voltage received by its negative input terminal - from the other output terminal of the polarity multiplexer module 24 is higher than the preset output voltage upper limit VLTH received by its positive input terminal +, it means that the output voltage is outside the preset output voltage range, and the third comparator CP3 outputs the judgment result that the output voltage is abnormal to the notification module 28; if the output voltage received by its negative input terminal - from the output terminal of the polarity multiplexer module 24 is not higher than the preset output voltage upper limit VLTH, it means that the output voltage is still within the preset output voltage range, and the third comparator CP3 outputs the judgment result that the output voltage is not abnormal to the notification module 28.

For the fourth comparator CP4, if the output voltage received by its positive input terminal + from the other output terminal of the polarity multiplexer module 24 is lower than the preset output voltage lower limit VLTL received by its negative input terminal -, it means that the output voltage is outside the preset output voltage range, and the fourth comparator CP4 outputs the judgment result that the output voltage is abnormal to the notification module 28; if the output voltage received by its positive input terminal + from the output terminal of the polarity multiplexer module 24 is not lower than the preset output voltage lower limit VHTL, it means that the output voltage is still within the preset output voltage range, and the fourth comparator CP4 outputs the judgment result that the output voltage is not abnormal to the notification module 28.

When the notification module 28 receives multiple judgment results from the first comparator CP1 to the fourth comparator CP4 respectively, if at least one of the judgment results is that the output voltage is abnormal, which means that at least one of the multiple output voltages is abnormal, the notification module 28 will immediately output a notification signal CON to activate the safety state to comply with specific standards (such as ISO26262 standards, but not limited to this).

In practical applications, the notification module 28 can control a specific pin through its timing controller TCON to output a notification signal CON with a low level to the front-end system, so as to notify the front-end system to make the vehicle source drive circuit enter a safe state, but the present invention is not limited thereto.

Please refer to FIG. 4, which shows a schematic diagram of a self-detection function that can be performed when the vehicle source drive circuit is powered on. As shown in FIG. 4, the first comparator CP1 to the fourth comparator CP4 in the judgment module 26 used to detect the source output voltage in FIG. 2B can perform a self-detection function when the vehicle source drive circuit is powered on. The comparison results of the first comparator CP1 to the fourth comparator CP4 can be obtained by inputting a high voltage level VH and a low voltage level VL (or vice versa) to the positive input terminal + and the negative input terminal - of the first comparator CP1 to the fourth comparator CP4, and the timing controller TCON judges whether the comparison results of the first comparator CP1 to the fourth comparator CP4 meet expectations. If the timing controller TCON determines that at least one of the comparison results does not meet expectations, the timing controller TCON will output a notification signal CON with a low level to the front-end system to notify the front-end system to put the vehicle source drive circuit into a safe state, but not limited to this.

Another specific embodiment of the present invention is a method for operating a vehicle source drive circuit. In this embodiment, the method for operating a vehicle source drive circuit is used to operate a vehicle source drive circuit. The vehicle source drive circuit may include a plurality of output channels coupled to a vehicle display panel, but is not limited thereto.

Please refer to FIG. 5 , which is a flow chart showing the operation method of the vehicle source drive circuit in this embodiment. As shown in FIG. 5 , the operation method of the vehicle source drive circuit may include the following steps:

Step S10: outputting a plurality of output voltages to a vehicle display panel via a plurality of output channels;

Step S12: Detecting the plurality of output voltages outputted by the plurality of output channels respectively during a specific period;

Step S14: determining whether the plurality of output voltages are abnormal according to a preset output voltage range;

If the judgment result of step S14 is yes, it means that an abnormal output voltage occurs, then step S16 is executed: a notification signal is immediately output to activate the safety state.

On the contrary, if the determination result of step S14 is negative, it means that there is no abnormal output voltage, and the process returns to step S12 to continue the output voltage detection.

It should be noted that the "specific period" in step S12 may be a plurality of frames after the vehicle source drive circuit is powered on and before the normal display period of the vehicle display panel, which can be used to insert black or white images, and the voltage range check is performed during the period of these frames, but it is not limited to this. In addition, the "specific period" may also be the vertical blanking period (V-Blanking) within the normal display period of the vehicle display panel, and the voltage range check is performed during these vertical blanking periods, but it is not limited to this.

In practical applications, step S12 may detect the output voltage of some of the plurality of output channels according to the line shift signal, but the present invention is not limited thereto. The "specific standard" mentioned in step S16 may be the ISO26262 standard, but the present invention is not limited thereto.

In one embodiment, the preset output voltage range may include a preset output voltage upper limit and a preset output voltage lower limit. Step S14 may compare the plurality of output voltages with the preset output voltage upper limit respectively. If at least one of the plurality of output voltages is higher than the preset output voltage upper limit, it may be determined that an output voltage abnormality has occurred. Similarly, step S14 may compare the plurality of output voltages with the preset output voltage lower limit respectively. If at least one of the plurality of output voltages is lower than the preset output voltage lower limit, it may be determined that an output voltage abnormality has occurred.

On the contrary, if the plurality of output voltages are all within the preset output voltage range, that is, the plurality of output voltages are not higher than the preset output voltage upper limit and are not lower than the preset output voltage lower limit, it can be determined that no output voltage abnormality occurs.

In one embodiment, step S16 can immediately control a specific pin through a timing controller to output a notification signal with a low level to the front-end system, so as to notify the front-end system to make the vehicle source drive circuit enter a safe state, but not limited thereto.

In practical applications, step S14 can also perform a self-test function when the vehicle source drive circuit is powered on. It can generate a comparison result by inputting a high voltage level and a low voltage level to the two input terminals of each comparator respectively, and the timing controller determines whether the comparison result of each comparator meets expectations, but is not limited to this.

If at least one of the comparison results is negative, indicating that at least one comparator is detected to be abnormal, the timing controller will immediately control a specific pin to output a notification signal with a low level to the front-end system, thereby notifying the front-end system to put the automotive source drive circuit into a safe state to comply with the ISO26262 specification.

Please refer to FIG. 6 , which is a flow chart showing an operation method of a vehicle source drive circuit in another specific embodiment of the present invention. As shown in FIG. 6 , the operation method of the vehicle source drive circuit may include the following steps:

Step S20: power on (working voltage VDD rises);

Step S21: Start IC power-on sequence;

Step S22: input a black pattern (or other pattern) and check the source output voltage range;

Step S23: voltage range check;

If the check result of step S23 is passed (Pass), it means that the output voltage is not abnormal, and a notification signal with a high level (ERROPB=HI) is output;

If the check result of step S23 is Failure, it means that the output voltage is abnormal, and a notification signal with a low level (ERROPB=LO) is output;

Next, after entering the normal display period, execute step S24: input a normal pattern and check the source output voltage range during the vertical blanking period (V-Blanking);

Step S25: voltage range check;

If the check result of step S25 is passed, it means that the output voltage is not abnormal, and a notification signal with a high level (ERROPB=HI) is output;

If the check result of step S25 is failure, indicating that the output voltage is abnormal, a notification signal with a low level (ERROPB=LO) is output; and

Step S26: Shutdown (operating voltage VDD drops).

Compared with the prior art, the automotive source driver circuit and its operation method of the present invention proposes a detection and notification mechanism for the output abnormality of the automotive source driver circuit, so that when the automotive source driver circuit detects an output abnormality, it can immediately notify the front-end system to enter a safe state to meet the safety goals, thereby achieving the functional safety of the ISO26262 specification and the hardware quantitative indicators of the ASIL level specification.

PL: Automotive display panel DA: Display area SIC: Automotive source drive integrated circuit GIC: Automotive gate drive integrated circuit GP: Gate pulse signal SDAT: Data signal ERROPB: Notification signal SOUT1~SOUT600: Output channel SOUT601~SOUT1200: Output channel SOUT1201~SOUT1800: Output channel SOUT1801~SOUT2400: Output channel SA: Part 1 SB: Part 2 SC: Part 3 SD: Part 4 20: Source drive module 21: Output voltage detection circuit 22: Switching module 24: Polarity multiplexing module 26: Judgment module 28: Notification module POP: First operational amplifier NOP: Second operational amplifier OM1~OM300: Output multiplexer LSS: Line shift signal SW1~SW600: Switching unit POL: Polarity signal CP1: First comparator CP2: Second comparator CP3: Third comparator CP4: Fourth comparator +: Positive input -: Negative input VHTH: Default output voltage upper limit VHTL: Default output voltage lower limit VLTH: Default output voltage upper limit VLTL: Default output voltage lower limit TCON: Timing controller CON: Notification signal VDD: Working voltage GRB/STBYB: Display switch control signal F1: First frame F2: Second frame F3: Third frame F4: 4th frame F5: 5th frame FN: Nth frame FN+1: N+1th frame FN+2: N+2th frame FN+3: N+3th frame FN+4: N+4th frame PM: Polarity multiplexing module VH: High voltage level VL: Low voltage level S10~S16: Steps S20~S26: Steps HI: High level LO: Low level

The attached drawings of the present invention are described as follows: FIG. 1 is a schematic diagram of a vehicle source driver integrated circuit applied to a vehicle display panel. FIG. 2A is a schematic diagram of a plurality of output channels of a vehicle source driver circuit divided into the first to fourth parts according to one specific embodiment of the present invention. FIG. 2B is a schematic diagram of a vehicle source driver circuit using the fourth part (output channels SOUT1801 to SOUT2400) as an example. FIG. 3 is a timing diagram of a specific period for voltage range check. FIG. 4 is a schematic diagram of a self-test function when the vehicle source driver circuit is powered on. FIG. 5 is a flow chart of a vehicle source driver circuit operation method according to another specific embodiment of the present invention. FIG6 shows a flow chart of an operation method of a vehicle source drive circuit according to another specific embodiment of the present invention.

S10~S16: Steps

Claims (8)

A vehicle source drive circuit is coupled to a vehicle display panel, comprising: a plurality of output channels, coupled to the vehicle display panel, for outputting a plurality of output voltages to the vehicle display panel; and an output voltage detection circuit, comprising: a judgment module, coupled to the plurality of output channels, for respectively detecting the plurality of output voltages output by the plurality of output channels during a specific period and judging whether the plurality of output voltages are abnormal according to a preset output voltage range; and a notification module. A group is coupled to the judgment module. If the judgment result of the judgment module is yes, the notification module immediately outputs a notification signal to activate a safety state to comply with a specific specification. The judgment module includes a first comparator for respectively comparing the plurality of output voltages with a preset output voltage upper limit of the preset output voltage range. If at least one of the plurality of output voltages is higher than the preset output voltage upper limit, the judgment module determines that the plurality of output voltages are abnormal. The automotive source drive circuit as described in claim 1, wherein the specific standard is the ISO26262 standard. A vehicle source drive circuit is coupled to a vehicle display panel, comprising: a plurality of output channels, coupled to the vehicle display panel, for outputting a plurality of output voltages to the vehicle display panel; and an output voltage detection circuit, comprising: a judgment module, coupled to the plurality of output channels, for respectively detecting the plurality of output voltages output by the plurality of output channels during a specific period and judging whether the plurality of output voltages are abnormal according to a preset output voltage range; and a notification module; module, coupled to the judgment module, if the judgment result of the judgment module is yes, the notification module immediately outputs a notification signal to activate a safety state to comply with a specific specification; wherein the judgment module includes a second comparator for respectively comparing the plurality of output voltages with a preset output voltage lower limit of the preset output voltage range, if at least one of the plurality of output voltages is lower than the preset output voltage lower limit, the judgment module determines that the plurality of output voltages are abnormal. A vehicle source drive circuit is coupled to a vehicle display panel, comprising: a plurality of output channels, coupled to the vehicle display panel, for outputting a plurality of output voltages to the vehicle display panel; and an output voltage detection circuit, comprising: a judgment module, coupled to the plurality of output channels, for respectively detecting the plurality of output voltages output by the plurality of output channels during a specific period and judging whether the plurality of output voltages are abnormal according to a preset output voltage range; and a notification module, coupled to the judgment module, for notifying the vehicle if the judgment result of the judgment module is yes. The notification module immediately outputs a notification signal to activate a safe state to comply with a specific specification; wherein the judgment module includes a comparator, which can perform a self-detection function when the vehicle source drive circuit is turned on, and generates a comparison result by inputting a high voltage level and a low voltage level to a timing controller, and the timing controller determines whether the comparison result meets expectations. If not, the timing controller controls a specific pin to output the notification signal with a low level to a front-end system, so as to notify the front-end system to make the vehicle source drive circuit enter the safe state. A vehicle source drive circuit operation method is used to operate a vehicle source drive circuit, the vehicle source drive circuit includes a plurality of output channels, coupled to a vehicle display panel, the vehicle source drive circuit operation method includes the following steps: (a) outputting a plurality of output voltages to the vehicle display panel through the plurality of output channels; (b) detecting the plurality of output voltages output by the plurality of output channels during a specific period; (c) detecting the plurality of output voltages outputted by the plurality of output channels according to a preset output voltage; range to determine whether the plurality of output voltages are abnormal; and (d) if the determination result of step (c) is yes, immediately output a notification signal to activate a safety state to comply with a specific specification; wherein step (c) includes: respectively comparing the plurality of output voltages with a preset output voltage upper limit of the preset output voltage range, and if at least one of the plurality of output voltages is higher than the preset output voltage upper limit, determining that the plurality of output voltages are abnormal. The method for operating a source drive circuit for an automobile as described in claim 5, wherein the specific standard is the ISO26262 standard. A vehicle source drive circuit operation method is used to operate a vehicle source drive circuit, the vehicle source drive circuit includes a plurality of output channels, coupled to a vehicle display panel, the vehicle source drive circuit operation method includes the following steps: (a) outputting a plurality of output voltages to the vehicle display panel through the plurality of output channels; (b) detecting the plurality of output voltages output by the plurality of output channels respectively during a specific period; (c) detecting the plurality of output voltages outputted by the plurality of output channels according to a preset output voltage (d) if the determination result of step (c) is yes, a notification signal is immediately output to activate a safety state to comply with a specific specification; wherein step (c) includes: comparing the plurality of output voltages with a preset output voltage lower limit of the preset output voltage range, and if at least one of the plurality of output voltages is lower than the preset output voltage lower limit, determining that the plurality of output voltages are abnormal. A vehicle source drive circuit operation method is used to operate a vehicle source drive circuit, the vehicle source drive circuit includes a plurality of output channels, coupled to a vehicle display panel, the vehicle source drive circuit operation method includes the following steps: (a) outputting a plurality of output voltages to the vehicle display panel through the plurality of output channels; (b) detecting the plurality of output voltages output by the plurality of output channels respectively during a specific period; (c) determining whether the plurality of output voltages are abnormal according to a preset output voltage range; and (d) if step (c) fails, the plurality of output voltages are abnormal; ) is yes, then a notification signal is immediately output to start a safe state to meet a specific specification; wherein, step (c) includes: performing a self-detection function when the vehicle source drive circuit is turned on, by inputting a high voltage level and a low voltage level to a comparator to generate a comparison result and a timing controller determines whether the comparison result meets expectations. If not, the timing controller controls a specific pin to output the notification signal with a low level to a front-end system, so as to notify the front-end system to make the vehicle source drive circuit enter the safe state.

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