WO2024108514A1 - 保护电路、显示装置和检测方法 - Google Patents
保护电路、显示装置和检测方法 Download PDFInfo
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- WO2024108514A1 WO2024108514A1 PCT/CN2022/134189 CN2022134189W WO2024108514A1 WO 2024108514 A1 WO2024108514 A1 WO 2024108514A1 CN 2022134189 W CN2022134189 W CN 2022134189W WO 2024108514 A1 WO2024108514 A1 WO 2024108514A1
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- switch tube
- screen
- circuit
- power supply
- voltage
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- 238000001514 detection method Methods 0.000 title claims abstract description 129
- 238000000034 method Methods 0.000 claims description 9
- 239000003990 capacitor Substances 0.000 claims description 6
- 238000010586 diagram Methods 0.000 description 16
- 238000003780 insertion Methods 0.000 description 10
- 230000037431 insertion Effects 0.000 description 10
- 230000000087 stabilizing effect Effects 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 4
- 239000004020 conductor Substances 0.000 description 3
- 101001121408 Homo sapiens L-amino-acid oxidase Proteins 0.000 description 1
- 101000827703 Homo sapiens Polyphosphoinositide phosphatase Proteins 0.000 description 1
- 102100026388 L-amino-acid oxidase Human genes 0.000 description 1
- 102100023591 Polyphosphoinositide phosphatase Human genes 0.000 description 1
- 101100012902 Saccharomyces cerevisiae (strain ATCC 204508 / S288c) FIG2 gene Proteins 0.000 description 1
- 101100233916 Saccharomyces cerevisiae (strain ATCC 204508 / S288c) KAR5 gene Proteins 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000012772 sequence design Methods 0.000 description 1
Classifications
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05F—SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
- G05F1/00—Automatic systems in which deviations of an electric quantity from one or more predetermined values are detected at the output of the system and fed back to a device within the system to restore the detected quantity to its predetermined value or values, i.e. retroactive systems
- G05F1/10—Regulating voltage or current
- G05F1/46—Regulating voltage or current wherein the variable actually regulated by the final control device is dc
- G05F1/56—Regulating voltage or current wherein the variable actually regulated by the final control device is dc using semiconductor devices in series with the load as final control devices
- G05F1/565—Regulating voltage or current wherein the variable actually regulated by the final control device is dc using semiconductor devices in series with the load as final control devices sensing a condition of the system or its load in addition to means responsive to deviations in the output of the system, e.g. current, voltage, power factor
- G05F1/569—Regulating voltage or current wherein the variable actually regulated by the final control device is dc using semiconductor devices in series with the load as final control devices sensing a condition of the system or its load in addition to means responsive to deviations in the output of the system, e.g. current, voltage, power factor for protection
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H11/00—Emergency protective circuit arrangements for preventing the switching-on in case an undesired electric working condition might result
Definitions
- the present application relates to the field of electronic technology, and in particular to a protection circuit, a display device and a detection method.
- the screen cable station When the factory produces and assembles televisions, the screen cable station is installed at the TCONLESS interface of the movement board. This can easily lead to poor oblique insertion of the screen cable, which can cause quality and safety problems such as burning out electronic components when powered on. This reduces the timeliness of the factory's production and increases hidden dangers on the factory's operation line.
- Embodiments of the present application provide a protection circuit, a display device, and a detection method.
- an embodiment of the present application provides a protection circuit, applied to a display device, comprising:
- a detection pin wherein the detection pin is connected to a screen line
- a micro-electrical providing circuit is connected to the detection pin and provides a first voltage to the detection pin;
- a comparison circuit comprising a first input terminal, a second input terminal and an output terminal, wherein the first input terminal is connected to the detection pin, the second input terminal transmits a reference voltage, and if the voltage of the first input terminal is greater than the reference voltage, the output terminal of the comparison circuit outputs a first level, otherwise the output terminal of the comparison circuit outputs a second level, and the reference voltage is less than the first voltage;
- the power supply control circuit is connected to the comparison circuit. If the output end of the comparison circuit outputs the first level, the power supply control circuit is used to control the display screen to be turned on by the power supply; if the output end of the comparison circuit outputs the second level, the power supply control circuit is used to control the display screen to be turned off by the power supply.
- the power supply control circuit includes a power input terminal, a screen power supply terminal, a screen start terminal and a power supply control terminal, the power input terminal is used to connect the power supply, the screen power supply terminal is used to connect the power pin of the display screen, the screen start terminal is used to receive a screen start signal, and the power supply control terminal is connected to the output terminal of the comparison circuit;
- the power supply control circuit controls the power input end and the screen power supply end to be turned on;
- the power supply control circuit controls the power input terminal and the screen power supply terminal to be disconnected.
- the multiple detection pins are respectively connected to multiple comparison circuits, and the power supply control circuit includes:
- a logic circuit wherein each of the multiple input terminals of the logic circuit is respectively connected to an output terminal of the comparison circuit, the output terminal of the logic circuit is connected to the power supply control terminal, and the logic circuit can perform a logic operation on the output terminal levels of the multiple comparison circuits and then output them.
- the power supply control circuit further includes a first switch tube and a control subcircuit, the input end of the first switch tube is connected to the power input end, the output end of the first switch tube is connected to the screen power supply end, and the screen start end and the output end are connected to the control end of the first switch tube through the control subcircuit;
- the control subcircuit provides a first signal to the control end of the first switch tube to turn on the input end and the output end of the first switch tube;
- control subcircuit If the output end of the logic circuit also outputs the second level, the control subcircuit provides a second signal to the control end of the first switch tube to disconnect the input end and the output end of the first switch tube.
- control subcircuit includes a second switch tube, a third switch tube and a fourth switch tube, the control end of the second switch tube is connected to the screen-on end, and the output end of the second switch tube is grounded;
- the input end of the third switch tube is connected to the output end of the logic circuit, the control end of the third switch tube is connected to the input end of the second switch tube through a first resistor, and the output end of the third switch tube is grounded through a second resistor;
- the input end of the fourth switch tube is connected to the control end of the first switch tube, the output end of the fourth switch tube is grounded, and the control end of the fourth switch tube is connected to the output end of the third switch tube.
- the input end of the fourth switch tube is connected to the control end of the first switch tube through the third resistor, and the input end of the fourth switch tube is connected to the input end of the first switch tube through the fourth resistor.
- the first switch tube is a MOS tube
- the second switch tube and the fourth switch tube are NPN switch tubes
- the third switch tube is a PNP switch tube.
- the protection circuit further includes:
- the indicating circuit comprises an indicating switch tube, an alarm and an indicating resistor, wherein the control end of the indicating switch tube is connected to the output end of the logic circuit, the input end of the indicating switch tube is connected to the power supply end through the indicating resistor, the output end of the indicating switch tube is grounded, one end of the alarm is connected to the input end of the indicating switch tube, and the other end of the alarm is grounded.
- control end of the indicating switch tube is connected to the output end of the logic circuit through a buffer resistor.
- connection interface is provided on a display screen or a circuit board of the display device, the screen cable is connected to the display screen or the circuit board via the connection interface, and the detection pin is provided on the connection interface.
- a plurality of the detection pins are arranged at intervals on the connection interface.
- the micro-electric providing circuit includes a battery, a current limiting resistor, a first voltage dividing resistor, a second voltage dividing resistor and a voltage-stabilizing reference source, the positive electrode of the battery is connected to the current limiting resistor, the first voltage dividing resistor and the second voltage dividing resistor in sequence and then grounded, the cathode of the voltage-stabilizing reference source is connected between the current limiting resistor and the first voltage dividing resistor, the anode of the voltage-stabilizing reference source is grounded, the reference pin of the voltage-stabilizing reference source is connected between the first voltage dividing resistor and the second voltage dividing resistor, and the cathode of the voltage-stabilizing reference source outputs the first voltage.
- the micro-electric supply circuit further includes a micro-electric switch, and the micro-electric switch is arranged between the battery and the current limiting resistor.
- the micro-electricity providing circuit further includes a filter capacitor, one end of the filter capacitor is connected to the positive electrode of the battery, and the other end is grounded.
- the detection pin is a power pin, and other pins adjacent to the power pin are low-level pins; or the detection pin is adjacent to a ground pin.
- an embodiment of the present application provides a display device, the display device comprising:
- a protection circuit wherein the protection circuit is as described in any one of the above items, and the protection circuit is arranged on the display screen or the circuit board.
- an embodiment of the present application provides a detection method, which is applied to a display device, and the method includes:
- the voltage of the detection pin is compared with a reference voltage, and the reference voltage is smaller than the first voltage signal
- the display screen is not powered.
- a first voltage is provided to the detection pin.
- the comparison circuit compares the voltage of the detection pin with the reference voltage. If the screen line is normally plugged into the connection interface, the voltage of the detection pin is the first voltage, that is, greater than the reference voltage.
- the comparison circuit outputs the first level accordingly, and the power supply control circuit controls the normal power supply to the display screen.
- the detection pin may contact the adjacent pin that does not provide the first voltage, causing the voltage of the detection pin to be pulled down, or when obliquely inserted, the screen line as a conductor may also conduct the detection pin with the adjacent pin that does not provide the first voltage, thereby causing the voltage of the detection pin to be pulled down, causing the voltage of the detection pin to be less than the reference voltage.
- the comparison circuit outputs the second level accordingly, and the power supply control circuit controls not to supply power to the display screen, protecting the display screen from damage to its internal electronic devices due to the oblique insertion of the screen line, and solving the quality safety problem of burning electronic components when the screen line is short-circuited due to oblique insertion in production operations.
- FIG1 is a schematic diagram of the structure of a protection circuit provided in an embodiment of the present application.
- FIG2 is a schematic diagram of the distribution of detection pins provided in an embodiment of the present application.
- FIG3 is a schematic diagram of a micro-electric circuit provided in an embodiment of the present application.
- FIG4 is a schematic diagram of a comparison circuit provided in an embodiment of the present application.
- FIG5 is a circuit diagram of a power supply control circuit provided in an embodiment of the present application.
- FIG6 is an example diagram of a logic circuit and a logic operation provided by an embodiment of the present application.
- FIG7 is a schematic diagram of an indication circuit provided in an embodiment of the present application.
- FIG8 is a schematic diagram of the structure of a display device provided in an embodiment of the present application.
- FIG. 9 is a schematic flow chart of the detection method provided in an embodiment of the present application.
- the embodiment of the present application provides a protection circuit 100, which is applied to a display device, such as a television, a computer, a tablet computer, etc.
- the display device may include a display screen, a circuit board, and a protection circuit, wherein the display screen and the circuit board may be connected via a screen line, and the protection circuit 100 may be arranged on the display screen or on the circuit board, and the protection circuit 100 includes a detection pin 110, a micro-electric supply circuit 120, a comparison circuit 130, and a power supply control circuit 140.
- Figure 1 is a schematic diagram of the structure of the protection circuit provided in the embodiment of the present application.
- Figure 2 is a schematic diagram of the distribution of the detection pins provided in the embodiment of the present application
- Figure 3 is a schematic diagram of the micro-electric supply circuit provided in the embodiment of the present application
- Figure 4 is a schematic diagram of the comparison circuit provided in the embodiment of the present application
- Figure 5 is a schematic diagram of the power supply control circuit provided in the embodiment of the present application.
- the detection pin 110 is connected to the screen line.
- the micro-electricity providing circuit 120 is connected to the detection pin 110 and can provide a first voltage to the detection pin 110 .
- the comparison circuit 130 includes a first input terminal U1, a second input terminal U2 and an output terminal U3 of the comparison circuit.
- the first input terminal U1 is connected to the detection pin 110, and the second input terminal U2 is connected to the reference voltage. If the voltage of the detection pin 110 is greater than the reference voltage, the output terminal U3 of the comparison circuit outputs a first level, otherwise the output terminal U3 of the comparison circuit outputs a second level, and the reference voltage is less than the first voltage.
- the power supply control circuit 140 is connected to the comparison circuit 130. If the output terminal U3 of the comparison circuit outputs a first level, the power supply control circuit 140 is used to control the display screen to be turned on and off by the power supply. If the output terminal U3 of the comparison circuit outputs a second level, the power supply control circuit 140 is used to control the display screen to be turned off and off by the power supply.
- a first voltage is provided to the detection pin 110 of the connection interface. After the detection pin 110 is connected to the screen line, the voltage of the detection pin 110 is compared with the reference voltage. If the screen line is normally plugged into the connection interface, the voltage of the detection pin 110 is the first voltage, that is, greater than the reference voltage.
- the comparison circuit 130 outputs the first level accordingly, and the power supply control circuit 140 controls the normal power supply to the display screen.
- the detection pin 110 may contact the adjacent pin that does not provide the first voltage, resulting in the voltage of the detection pin 110 being pulled down, or when the screen line is inserted obliquely, the screen line as a conductor may also conduct the detection pin 110 with the adjacent pin that does not provide the first voltage, thereby causing the voltage of the detection pin 110 to be pulled down, resulting in the voltage of the detection pin 110 being less than the reference voltage.
- the comparison circuit 130 outputs the second level accordingly, and the power supply control circuit 140 controls not to supply power to the display screen, protecting the display screen from damage to its internal electronic devices due to the oblique insertion of the screen line, and solving the quality safety problem of burning components caused by the oblique insertion of the screen line in the production operation.
- the power supply control circuit 140 includes a power input terminal VDD, a screen power supply terminal PANNEL_VCC, a screen turn-on terminal PANNEL_ON/OFF and a power supply control terminal D1.
- the power input terminal VDD is used to connect the power supply
- the screen power supply terminal PANNEL_VCC is used to connect the power pin of the display screen
- the screen turn-on terminal PANNEL_ON/OFF is used to receive a screen turn-on signal
- the power supply control terminal D1 is connected to the output terminal U3 of the comparison circuit.
- the power supply control circuit 140 controls the power input terminal VDD and the screen power supply terminal PANNEL_VCC to be turned on; if the output terminal U3 of the comparison circuit outputs the second level, the power supply control circuit 140 controls the power input terminal VDD and the screen power supply terminal PANNEL_VCC to be turned off.
- the display device also includes a screen cable, one end of which is connected to the display screen, and the other end is connected to the circuit board.
- a connection interface may be provided on the circuit board or the display screen, and the screen cable may be connected to the display screen or the circuit board through the connection interface, wherein a detection pin 110 may be provided at the connection interface.
- the power supply control circuit 140 does not supply power to the display screen to protect the electronic components from being damaged due to the oblique insertion of the screen cable.
- the detection pin 110 is illustrated below.
- the detection pin 110 of the connection interface may be provided as needed, and the number of the detection pins 110 may be multiple, and the multiple detection pins 110 may be spaced apart at the connection interface, so that when the pins at different positions of the screen cable are obliquely inserted, they can all be detected.
- the connection interface of the display screen or circuit board may include two left and right connection interfaces, and 12 detection pins 110 are set on the left and right connection interfaces, and a first voltage is provided to the 12 detection pins 110 respectively. As shown in Figure 2, the voltages of the 12 detection pins 110 are V_CHECK_1 to V_CHECK_12 respectively.
- the detection pin 110 can be a power pin, such as the pins corresponding to V_CHECK_4, V_CHECK_5, V_CHECK_6, etc. in FIG. 2.
- the micro-electric providing circuit 120 can provide a relatively low voltage, i.e., a first voltage, to the power pin.
- the value of the first voltage can be set as needed, such as 40mV, 50mV, 60mV, 100mV, etc.
- the screen line includes a power connection line connected to the power pin, and also includes a connection line connected to other pins adjacent to the power pin. If the screen line is inserted obliquely with the connection interface, the power pin will be connected to the connection line next to the power connection line in the screen line.
- the connection lines of other pins are generally in a low level state, thereby pulling down the voltage of the power pin, such as becoming 0V or less than 10mV.
- the power pin is selected as the detection pin 110 because the voltage of the power pin is at the level of several volts when it is working normally. Even if the power pin still has a relatively low first voltage residue after the display screen is powered on, it will not affect the normal operation of the power pin.
- the detection pin 110 can be adjacent to a ground pin, such as the pins corresponding to V_CHECK_1, V_CHECK_2, V_CHECK_3, etc. in Figure 2. That is, the pin next to the ground pin is set as the detection pin 110, and a first voltage is provided. If the screen line is inserted obliquely into the connection interface, the detection pin 110 will be connected to the connection line next to it in the screen line that is connected to the ground pin, thereby causing the voltage of the detection pin 110 to be pulled down, such as becoming 0V or less than 10mV. It should be noted that based on the screen line sequence design of the existing display screen, the pins adjacent to the ground pin are generally not used to transmit differential data. Therefore, even after the display screen is powered on, the pins adjacent to the ground pin still have a relatively low first voltage residue, and the impact on the data transmission of the screen line is also very small.
- a ground pin such as the pins corresponding to V_CHECK_1, V_CHECK_2, V_CHECK_
- connection interfaces on the display screen or circuit board end used to connect to the screen cable can be set according to design requirements, such as 1 or 3, and the number of detection pins 110 can also be set according to needs, such as 1, 8, 15, etc. This embodiment does not limit this.
- FIG. 6 is a schematic diagram of a logic circuit and logic operations provided in an embodiment of the present application.
- connection interface has a plurality of detection pins 110
- the plurality of detection pins 110 are respectively connected to a plurality of comparison circuits 120.
- the power supply control circuit 140 may further include a logic circuit 150, each of the plurality of input terminals of the logic circuit 150 is respectively connected to an output terminal U3 of a comparison circuit, the output terminal of the logic circuit 150 is connected to the power supply control terminal D1, and the logic circuit 150 can perform a logic operation on the levels of the output terminals U3 of the plurality of comparison circuits and then output them, for example, the voltage outputted by the output terminal of the logic circuit 150 is V_CHECK_BUS.
- the comparison circuit 120 includes a low-noise operational amplifier U, which includes a first input terminal U1, a second input terminal U2 and an output terminal U3 of the comparison circuit.
- the first input terminal U1 is connected to a detection pin 110, and the second input terminal U2 is connected to a reference voltage.
- the reference voltage is, for example, 25mv.
- the voltage V_CHECK_n of the detection pin 110 is compared with the reference voltage.
- the level V_CHECK_N_OP output by the output terminal U3 of the comparison circuit is a first level, otherwise the level V_CHECK_N_OP output by the output terminal U3 of the comparison circuit is a second level, for example, the first level is a high level and the second level is a low level.
- the output ends U3 of multiple comparison circuits are connected to the logic circuit 150 for AND logic operation.
- the logic circuit 150 for AND logic operation.
- the output ends U3 of the 12 comparison circuits respectively output 12 comparison results V_CHECK_1_OP to V_CHECK_12_OP, and the output ends U3 of the 12 comparison circuits are input to the logic circuit 150 for AND logic operation.
- V_CHECK_1_OP and V_CHECK_2_OP are input to two input terminals of the logic circuit 150150 for AND logic operation, and one of the first intermediate operation results V_CHECK_A_BUS is output.
- the logic circuit 150 obtains six first intermediate operation results, namely: V_CHECK_A_BUS, V_CHECK_B_BUS, V_CHECK_C_BUS, V_CHECK_D_BUS, V_CHECK_E_BUS, and V_CHECK_F_BUS; then V_CHECK_A_BUS and V_CHECK_B_BUS are input to the other two input terminals of the logic circuit 150 for AND logic operation, and one of the first intermediate operation results V_CHECK_A_BUS is output.
- a second intermediate operation structure V_CHECK_1_SINK, and so on, the logic circuit 150 further obtains three second intermediate operation results, namely: V_CHECK_1_SINK, V_CHECK_2_SINK, V_CHECK_3_SINK; then V_CHECK_1_SINK and V_CHECK_2_SINK are input to the other two input terminals of the logic circuit 150 for AND logic operation, and output V_CHECK_A_SINK; finally, V_CHECK_A_SINK and V_CHECK_3_SINK are input to the other two input terminals of the logic circuit 150 for AND logic operation, and the output terminal of the logic circuit 150 outputs the final operation result V_CHECK_BUS.
- V_CHECK_N_OP is equivalent to V_CHECK_BUS.
- the voltages of the plurality of detection pins 110 may be subjected to an AND logic operation first and then input to the first input terminal U1 of the comparison circuit 120 for comparison with a reference voltage. Then, the level output by the output terminal U3 of the comparison circuit is V_CHECK_BUS, which is not limited in this embodiment.
- the power supply control circuit 140 also includes a first switch tube T and a control subcircuit D.
- the input terminal T1 of the first switch tube is connected to the power input terminal VDD.
- the power input terminal can provide a power supply voltage for driving the display screen, such as 12V or other voltages.
- the output terminal T2 of the first switch tube T is connected to the screen power supply terminal PANNEL_VCC.
- the screen opening terminal PANNEL_ON/OFF and the output terminal V_CHECK_BUS are connected to the control terminal T3 of the first switch tube T through the control subcircuit D.
- the screen opening terminal PANNEL_ON/OFF can be connected to a processor, and the processor sends a signal to control the display screen to turn on or off.
- the control subcircuit D If the output terminal V_CHECK_BUS of the logic circuit 150 outputs a first level, and the screen-on terminal PANNEL_ON/OFF receives a screen-on signal, the control subcircuit D provides a first signal to the control terminal T3 of the first switch tube T, so that the input terminal T1 and the output terminal T2 of the first switch tube T are turned on; if the output terminal V_CHECK_BUS of the logic circuit 150 outputs a second level, the control subcircuit D provides a second signal to the control terminal T3 of the first switch tube T, so that the input terminal T1 and the output terminal T2 of the first switch tube T are turned off.
- the first switch tube T can conveniently control the power input terminal VDD and the screen power supply terminal PANNEL_VCC of the display screen to be turned on or off.
- the control sub-circuit D for controlling the first switch tube T is jointly controlled by the output terminal V_CHECK_BUS of the logic circuit 150 and the screen-on terminal PANNEL_ON/OFF.
- the control sub-circuit D is a logic circuit, that is, the first switch tube T1 can be controlled to be turned on only when the output terminal V_CHECK_BUS of the logic circuit 150 and the screen-on terminal PANNEL_ON/OFF both meet the conditions (such as both are high levels). If one of the output terminal V_CHECK_BUS and the screen-on terminal PANNEL_ON/OFF of the logic circuit 150 does not meet the conditions (such as one is low level), the first switch tube T will not be turned on.
- the control subcircuit D includes a second switch tube K, a third switch tube Q and a fourth switch tube P.
- the control end K3 of the second switch tube K is connected to the screen-on end PANNEL_ON/OFF, and the output end K2 of the second switch tube K is grounded;
- the input end Q1 of the third switch tube Q is connected to the output end V_CHECK_BUS of the logic circuit 150,
- the control end Q3 of the third switch tube Q is connected to the input end K1 of the second switch tube K through the first resistor R1, and the output end Q2 of the third switch tube Q is grounded through the second resistor R2;
- the input end P1 of the fourth switch tube P is connected to the control end T3 of the first switch tube T, the output end P2 of the fourth switch tube P is grounded, and the control end P3 of the fourth switch tube P is connected to the output end Q2 of the third switch tube Q.
- the second switch tube K When the screen-on terminal PANNEL_ON/OFF outputs a high level, the second switch tube K is turned on, and the voltage of the first resistor R1 is pulled down, thereby turning on the third switch tube Q. If the voltage V_CHECK_BUS outputted by the output terminal of the logic circuit 150 is at a high level, the fourth switch tube P can be controlled to be turned on, thereby controlling the first switch tube T to be turned on.
- the first switch tube T is a MOS tube
- the second switch tube K and the fourth switch tube P are NPN switch tubes
- the third switch tube Q is a PNP switch tube.
- the input end P1 of the fourth switch tube P is connected to the control end T3 of the first switch tube T through the third resistor R3.
- the input end P1 of the fourth switch tube P is also connected to the input end T1 of the first switch tube T3 through the fourth resistor.
- the micro-electricity providing circuit 120 includes a battery B, a current limiting resistor R7, a first voltage dividing resistor R8, a second voltage dividing resistor R9 and a voltage stabilizing reference source V, the positive electrode of the battery B is connected to the current limiting resistor R7, the first voltage dividing resistor R8 and the second voltage dividing resistor R9 in sequence and then grounded, the cathode V3 of the voltage stabilizing reference source V is connected between the current limiting resistor R7 and the first voltage dividing resistor R8, the anode V2 of the voltage stabilizing reference source V is grounded, the reference pin V1 of the voltage stabilizing reference source V is connected between the first voltage dividing resistor R7 and the second voltage dividing resistor R8, and the cathode V3 of the voltage stabilizing reference source V outputs a first voltage, for example, the first voltage is 50mv.
- battery B may be a button battery.
- the micro-electric supply circuit 120 further includes a micro-electric switch L, which is disposed between the battery B and the current limiting resistor R7.
- the micro-electric switch L can be controlled to be disconnected, which can reduce the consumption of the battery B, extend the service life of the battery B, and eliminate the impact of the micro-electric supply circuit 120 on the display screen.
- the micro-electricity providing circuit 120 further includes a filter capacitor C, one end of the filter capacitor C is connected to the positive electrode of the battery B, and the other end is grounded.
- the protection circuit 100 also includes an indication circuit 160, which includes an indication switch tube G, an alarm F and an indication resistor R5.
- the control end G3 of the indication switch tube G is connected to the output end V_CHECK_BUS of the logic circuit 150, the input end G1 of the indication switch tube G is connected to the power supply end VDD through the indication resistor R5, the output end G2 of the indication switch tube G is grounded, one end of the alarm F is connected to the input end G1 of the indication switch tube G, and the other end of the alarm F is grounded.
- the indicator switch tube F When the output terminal V_CHECK_BUS of the logic circuit 150 outputs a high level, the indicator switch tube F is turned on, and the electrical signal provided by the power supply terminal VDD is directed to the ground, and the electrical signal provided by the power supply terminal VDD does not pass through the alarm F.
- the output terminal V_CHECK_BUS of the logic circuit 150 When the output terminal V_CHECK_BUS of the logic circuit 150 outputs a low level, the indicator switch tube G is disconnected, and the electrical signal provided by the power supply terminal VDD passes through the alarm F, and the alarm F starts to work.
- the alarm F can be an LED light, and the alarm F can light up to prompt that the screen cable is obliquely inserted.
- the alarm can be an electro-acoustic converter (such as a buzzer), and the electro-acoustic converter can emit an alarm sound to prompt that the screen cable is obliquely inserted.
- control terminal G3 of the indicator switch tube G can be connected to the output terminal V_CHECK_BUS of the logic circuit 150 through the buffer resistor R6.
- the display device 10 includes a display screen 200, a circuit board 300, a screen line 400 and a protection circuit 100.
- the circuit board 300 and the display screen 200 provide a screen line 400 connection.
- the protection circuit 100 can be set on any side of the circuit 300 or the display screen 200. Taking Figure 8 as an example, the protection circuit 100 is set on the display screen side. In this embodiment, whether the screen line at the end of the circuit board 300 is inserted obliquely or the screen line at the end of the display screen 200 is inserted obliquely, the display screen 200 is not powered to protect the electronic components of the display screen 200 from being damaged due to the oblique insertion of the screen line. Please refer to the detailed description above for the specific protection circuit 100, which will not be repeated here.
- FIG. 9 is a flow chart of a detection method provided in an embodiment of the present application.
- the detection method in an embodiment of the present application is applied to a display device, and the method includes:
- a first voltage is provided to a detection pin
- the display device may include a protection circuit, which may be arranged on a display screen or on a circuit board.
- the protection circuit is provided with a special micro-electric supply circuit, which may have its own battery, and the battery may provide a first voltage to the detection pin.
- the specific protection circuit please refer to the detailed description above, which will not be repeated here.
- the power supply circuit of the display device may also provide a first voltage to the detection pin.
- a connection interface can be set on the circuit board or display screen, the screen cable is connected to the display screen or circuit board through the connection interface, the detection pin can be located on the connection interface, the number of detection pins can be one or more, and the value of the first voltage can be set as needed, such as 40mV, 50mV, 60mV, 100mV, etc.
- the voltage of the detection pin is compared with a reference voltage, and the reference voltage is smaller than the first voltage signal
- the reference voltage is less than the first voltage, for example, it can be 20mV, 25mV, 30mV, etc. Since the display screen will not be powered on during the screen cable assembly process, except for the detection pin that provides the first voltage, the connection lines of other pins are generally in a low-level state.
- the detection pin will contact the adjacent pin that does not provide the first voltage, causing the voltage of the detection pin to be pulled down, or when the screen cable is inserted obliquely, the screen cable as a conductor may also connect the detection pin with the adjacent pin that does not provide the first voltage, thereby causing the voltage of the detection pin to be pulled down, such as becoming 0V or less than 10mV. Therefore, when the detection pin is connected to the screen cable, the voltage of the detection pin is compared with the reference voltage.
- the display screen is powered. If the voltage of the detection pin is less than the reference voltage, it means that the screen cable is inserted obliquely, and the display screen is not powered.
- a first voltage is provided to each detection pin; after the multiple detection pins are connected to the screen line, the voltage of each detection pin is compared with the reference voltage. If the voltage of each detection pin is greater than the reference voltage and a screen-on signal is received, power is supplied to the display screen; if the voltage of any one of the detection pins is less than the reference voltage, power is not supplied to the display screen.
- the detection method in this embodiment can protect the display screen from damage to its internal electronic components due to the oblique insertion of the screen cable, and solves the quality safety problem of burning components due to short circuit caused by oblique insertion of the screen cable in production operations.
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Abstract
一种保护电路（100），包括：与屏线连接的检测引脚（110）、与检测引脚（110）连接并提供第一电压的微电提供电路（120）、比较电路（130）和供电控制电路（140）。若比较电路（130）第一输入端（U1）的电压大于参考电压，则输出端（U3）输出第一电平，否则输出第二电平；若输出端（U3）输出第一电平，则与比较电路（130）连接的供电控制电路（140）控制显示屏（200）与电源导通；若输出端（U3）输出第二电平，则控制显示屏（200）与电源断开。
Description
本申请涉及电子技术领域，尤其涉及一种保护电路、显示装置和检测方法。
低成本的TCONLESS方案已经成为当今电视行业配屏设计的主流。
工厂在生产组装电视时，在机芯板TCONLESS接口安装屏线工位，容易发生屏线斜插不良造成上电烧坏电子元器件的质量安全问题，降低了工厂生产的时效性，增加了工厂作业线上的隐患。
本申请实施例提供一种保护电路、显示装置和检测方法。
第一方面，本申请实施例提供一种保护电路，应用于显示装置，其包括：
检测引脚，所述检测引脚与屏线连接；
微电提供电路，与所述检测引脚连接，给所述检测引脚提供第一电压；
比较电路，包括第一输入端、第二输入端和输出端，所述第一输入端连接所述检测引脚，所述第二输入端传输参考电压，若所述第一输入端的电压大于所述参考电压，则所述比较电路的输出端输出第一电平，否则所述比较电路的输出端输出第二电平，所述参考电压小于所述第一电压；
供电控制电路，与所述比较电路连接，若所述比较电路的输出端输出所述第一电平，则所述供电控制电路用于控制显示屏与电源导通；若所述比较电路的输出端输出所述第二电平，则所述供电控制电路用于控制显示屏与电源断开。
可选的，所述供电控制电路包括电源输入端、屏供电端、屏开启端和供电控制端，所述电源输入端用于连接电源，所述屏供电端用于连接所述显示屏的电源引脚，所述屏开启端用于接收屏开启信号，所述供电控制端连接所述比较电路的输出端；
若所述比较电路的输出端输出所述第一电平，且所述屏开启端接收到屏开启信号，则所述供电控制电路控制所述电源输入端和所述屏供电端导通；
若所述比较电路的输出端输出所述第二电平，则所述供电控制电路控制所述电源输入端和所述屏供电端断开。
可选的，所述检测引脚为多个，多个所述检测引脚分别连接多个所述比较电路，所述供电控制电路包括：
逻辑电路，所述逻辑电路多个输入端中的每一个输入端分别与一个所述比较电路的输出端连接，所述逻辑电路的输出端连接所述供电控制端，所述逻辑电路能够将多个所述比较电路的输出端电平进行与逻辑运算后输出。
可选的，所述供电控制电路还包括第一开关管、控制子电路，所述第一开关管的输入端连接电源输入端，所述第一开关管的输出端连接屏供电端，所述屏开启端和所述输出端通过所述控制子电路与所述第一开关管的控制端连接；
其中，若所述逻辑电路的输出端也输出所述第一电平，且所述屏开启端接收到屏开启信号，则所述控制子电路给所述第一开关管的控制端提供第一信号，以使所述第一开关管的输入端和输出端导通；
若所述逻辑电路的输出端也输出所述第二电平，则所述控制子电路给所述第一开关管的控制端提供第二信号，以使所述第一开关管的输入端和输出端断开。
可选的，所述控制子电路包括第二开关管、第三开关管和第四开关管，所述第二开关管的控制端连接所述屏开启端，所述第二开关管的输出端接地；
所述第三开关管的输入端连接所述逻辑电路的输出端，所述第三开关管的控制端通过第一电阻连接所述第二开关管的输入端，所述第三开关管的输出端通过第二电阻接地；
所述第四开关管的输入端连接所述第一开关管的控制端，所述第四开关管的输出端接地，所述第四开关管的控制端连接所述第三开关管的输出端。
可选的，所述第四开关管的输入端通过所述第三电阻连接所述第一开关管的控制端，所述第四开关管的输入端通过所述第四电阻连接所述第一开关管的输入端。
可选的，所述第一开关管为MOS管，所述第二开关管和所述第四开关管为NPN开关管，所述第三开关管为PNP开关管。
可选的，所述保护电路还包括：
指示电路，包括指示开关管、报警器和指示电阻，所述指示开关管的控制端连接所述逻辑电路的输出端，所述指示开关管的输入端通过所述指示电阻连接供电端，所述指示开关管的输出端接地，所述报警器的一端连接所述指示开关管的输入端，所述报警器的另一端接地。
可选的，所述指示开关管的控制端通过缓冲电阻连接所述逻辑电路的输出端。
可选的，所述显示装置的显示屏或电路板上设置有连接接口，所述屏线通过所述连接接口与所述显示屏或所述电路板连接，所述检测引脚设置在所述连接接口。
可选的，多个所述检测引脚间隔设置于所述连接接口。
可选的，所述微电提供电路包括电池、限流电阻、第一分压电阻、第二分压电阻和稳压基准源，所述电池的正极依次连接所述限流电阻、所述第一分压电阻和所述第二分压电阻后接地，所述稳压基准源的阴极连接于所述限流电阻和所述第一分压电阻之间，所述稳压基准源的阳极接地，所述稳压基准源的参考脚连接于所述第一分压电阻和所述第二分压电阻之间，所述稳压基准源的阴极输出所述第一电压。
可选的，所述微电提供电路还包括微电开关，所述微电开关设置于所述电池和所述限流电阻之间。
可选的，所述微电提供电路还包括滤波电容，所述滤波电容的一端与所述电池的正极连接，另一端接地。
可选的，所述检测引脚为电源引脚，与所述电源引脚相邻的其他引脚为低电平引脚；或者所述检测引脚相邻接地引脚。
第二方面，本申请实施例提供一种显示装置，所述显示装置包括：
显示屏；
电路板；
屏线，所述显示屏通过所述屏线与所述电路板连接；
保护电路，所述保护电路如上述任一项所述的保护电路，所述保护电路设置在所述显示屏或所述电路板。
第三方面，本申请实施例提供一种检测方法，应用于显示装置，所述方法包括：
给检测引脚提供第一电压；
所述检测引脚与屏线连接后，将所述检测引脚的电压与参考电压进行比较，所述参考电压小于所述第一电压信号；
若所述检测引脚的电压大于所述参考电压，且接收到屏开启信号，则给所述显示屏供电；
若所述检测引脚的电压小于所述参考电压，则不给所述显示屏供电。
本申请提供的实施例中，给检测引脚提供第一电压，检测引脚与屏线连接后，比较电路将检测引脚的电压与参考电压进行比较，若屏线与连接接口正常插接，则检测引脚的电压为第一电压，即大于参考电压，比较电路对应输出第一电平，则供电控制电路控制给显示屏正常供电。若屏线与连接接口斜插，由于屏线的挤压，会导致检测引脚与相邻的未提供第一电压的引脚接触，导致检测引脚的电压被拉低，或者斜插时屏线作为导体也可能会把检测引脚与相邻的未提供第一电压的引脚相导通，进而使检测引脚的电压被拉低，导致检测引脚的电压小于参考电压，比较电路对应输出第二电平，则供电控制电路控制不给显示屏供电，保护显示屏不会因为屏线斜插导致其内部电子器件损坏，解决了生产作业上的屏线斜插短路造成上电烧坏电子元器件的质量安全问题。
为了更清楚地说明本申请实施例中的技术方案，下面将对实施例描述中所需要使用的附图作简单地介绍，显而易见地，下面描述中的附图仅仅是本申请的一些实施例，对于本领域技术人员来讲，在不付出创造性劳动的前提下，还可以根据这些附图获得其他的附图。
图1为本申请实施例提供的保护电路的结构示意图；
图2为本申请实施例提供的检测引脚的分布示意图；
图3为本申请实施例提供的微电提供电路的示意图；
图4为本申请实施例提供的比较电路的示意图；
图5为本申请实施例提供的供电控制电路的电路示意图；
图6为本申请实施例提供的逻辑电路与逻辑运算的示例图；
图7本申请实施例提供的指示电路的示意图；
图8为本申请实施例提供的显示装置的结构示意图；
图9为本申请实施例提供的检测方法的流程示意图。
下面将结合本申请实施例中的附图，对本申请实施例中的技术方案进行清楚、完整地描述。显然，所描述的实施例仅仅是本申请一部分实施例，而不是全部的实施例。以下对至少一个示例性实施例的描述实际上仅仅是说明性的，决不作为对本申请及其应用或使用的任何限制。基于本申请中的实施例，本领域技术人员在没有付出创造性劳动前提下所获得的所有其他实施例，都属于本申请的保护范围。
本申请实施例提供一种保护电路100,保护电路100应用在显示装置上，显示装置比如可以为电视、电脑、平板电脑等显示装置，显示装置可以包括显示屏、电路板和保护电路，其中，显示屏和电路板可以通过屏线进行连接，保护电路100可以设置在显示屏或设置在电路板上，保护电路100包括检测引脚110、微电提供电路120、比较电路130和供电控制电路140。请参考图1至图5，图1为本申请实施例提供的保护电路的结构示意图。图2为本申请实施例提供的检测引脚的分布示意图，图3为本申请实施例提供的微电提供电路的示意图，图4为本申请实施例提供的比较电路的示意图，图5为本申请实施例提供的供电控制电路的示意图。
检测引脚110与屏线连接。
微电提供电路120与检测引脚110连接，能够给检测引脚110提供第一电压。
比较电路130包括第一输入端U1、第二输入端U2和比较电路的输出端U3，第一输入端U1连接检测引脚110，第二输入端U2连接参考电压，若检测引脚110的电压大于参考电压，则比较电路的输出端U3输出第一电平，否则比较电路的输出端U3输出第二电平，参考电压小于第一电压。
供电控制电路140与比较电路130连接，若比较电路的输出端U3输出第一电平，则供电控制电路140用于控制显示屏与电源导通；若比较电路的输出端U3输出第二电平，则供电控制电路140用于控制显示屏与电源断开。
保护电路100中，给连接接口的检测引脚110提供第一电压，检测引脚110与屏线连接后，将检测引脚110的电压与参考电压进行比较，若屏线与连接接口正常插接，则检测引脚110的电压为第一电压，即大于参考电压，比较电路130对应输出第一电平，则供电控制电路140控制给显示屏正常供电。若屏线与连接接口斜插，由于屏线的挤压，会导致检测引脚110与相邻的未提供第一电压的引脚接触，导致检测引脚110的电压被拉低，或者斜插时屏线作为导体也可能会把检测引脚110与相邻的未提供第一电压的引脚相导通，进而使检测引脚110的电压被拉低，导致检测引脚110的电压小于参考电压，比较电路130对应输出第二电平，则供电控制电路140控制不给显示屏供电，保护显示屏不会因为屏线斜插导致其内部电子器件损坏，解决了生产作业上的屏线斜插短路造成上电烧元器件的质量安全问题。
示例性的，请参考图5，供电控制电路140包括电源输入端VDD、屏供电端PANNEL_VCC、屏开启端PANNEL_ON/OFF和供电控制端D1，电源输入端VDD用于连接电源，屏供电端PANNEL_VCC用于连接显示屏电源引脚，屏开启端PANNEL_ON/OFF用于接收屏开启信号，供电控制端D1连接比较电路的输出端U3。
若比较电路的输出端U3输出第一电平，且屏开启端PANNEL_ON/OFF接收到屏开启信号，则供电控制电路140控制电源输入端VDD和屏供电端PANNEL_VCC导通；若比较电路的输出端U3输出第二电平，则供电控制电路140控制电源输入端VDD和屏供电端PANNEL_VCC断开。
示例性的，显示装置还包括屏线，屏线的一端连接显示屏，一端连接电路板，电路板或显示屏上可以设置连接接口，屏线可以通过连接接口与显示屏或电路板连接，其中，检测引脚110可以设置在连接接口，本实施例中无论是电路板端的屏线发生斜插或者是显示屏端的屏线发生斜插，供电控制电路140都不给显示屏供电，以保护电子元器件不会因此屏线斜插而发生损坏。为了更好理解检测引脚110，以下对检测引脚110进行举例说明。连接接口的检测引脚110可以根据需要设置，检测引脚110的数量为多个，多个检测引脚110间隔设置于连接接口，使得当屏线不同位置的引脚发生斜插时，都能够被检测出来。请参考图2，显示屏或电路板的连接接口可以包括左右两个连接接口，并在左右两个连接接口上设置了12个检测引脚110，并分别给该12个检测引脚110提供了第一电压，如图2所示，该12个检测引脚110的电压分别为V_CHECK_1至V_CHECK_12。
示例性的，检测引脚110可以为电源引脚，如图2中V_CHECK_4、V_CHECK_5、V_CHECK_6等对应的引脚，微电提供电路120可以给电源引脚提供比较低的电压即第一电压，第一电压的值可以根据需要设置，例如40mV、50mV、60mV、100mV等。屏线包括与电源引脚连接的电源连接线，还包括与电源引脚相邻的其他引脚连接的连接线，若屏线与连接接口斜插，电源引脚会与屏线中电源连接线旁边的连接线连接，由于在屏线组装工序，不会对显示屏进行上电，因此除了检测引脚110提供了第一电压以外，其他引脚的连接线一般都处于低电平状态，进而使电源引脚的电压被拉低，如变为0V或小于10mV。需要说明的是，之所以选择电源引脚作为检测引脚110，是因为电源引脚在正常工作的时候，电压都是几伏级别的，即使显示屏上电后，电源引脚还具有比较低的第一电压残留，也不会影响电源引脚的正常工作。
另一示例中，检测引脚110可以相邻接地引脚，比如图2中的V_CHECK_1、V_CHECK_2、V_CHECK_3等对应的引脚。即，将接地引脚旁边的引脚设为检测引脚110，并提供第一电压。若屏线与连接接口斜插，检测引脚110会与屏线中其旁边的与接地引脚连接的连接线连接，进而使检测引脚110的电压被拉低，如变为0V或小于10mV。需要说明的是，基于现有的显示屏的屏线线序设计，与接地引脚相邻的引脚一般都不会用于传输差分数据，因此即使显示屏上电后，与接地引脚相邻的引脚还具有比较低的第一电压残留，对屏线进行数据传输的影响也很小。
需要说明的是，显示屏或电路板端用于与屏线连接的连接接口的数量可以根据设计需要进行设置，比如还可以为1个或3个等，检测引脚110的数量也可以根据需要进行设置，比如可以为1个、8个、15个等，本实施例不对此进行限定。
请参考图4和图6，图6为本申请实施例提供的逻辑电路与逻辑运算的示意图。
本实施例中，若连接接口具有多个检测引脚110，多个检测引脚110分别连接多个比较电路120。供电控制电路140还可以包括逻辑电路150，逻辑电路150多个输入端中的每一个输入端分别与一个比较电路的输出端U3连接，逻辑电路150的输出端连接供电控制端D1，逻辑电路150能够将多个比较电路的输出端U3的电平进行与逻辑运算后输出，比如，逻辑电路150的输出端输出的电压为V_CHECK_BUS。
具体的，比较电路120包括一个低噪运算放大器U，低噪运算放大器U包括第一输入端U1、第二输入端U2和比较电路的输出端U3，第一输入端U1连接一个检测引脚110，第二输入端U2连接参考电压，参考电压比如为25mv，将检测引脚110的电压V_CHECK_n与参考电压进行比较，若检测引脚110的电压V_CHECK_n大于参考电压，则比较电路的输出端U3输出的电平V_CHECK_N_OP为第一电平，否则比较电路的输出端U3输出的电平V_CHECK_N_OP为第二电平，比如，第一电平为高电平，第二电平为低电平。
多个比较电路的输出端U3连接逻辑电路150进行与逻辑运算，示例性的，检测引脚110为12个，12个检测引脚110分别连接12个比较电路120，12个比较电路的输出端U3分别输出12个比较结果V_CHECK_1_OP至V_CHECK_12_OP，将该12个比较电路的输出端U3输入逻辑电路150进行与逻辑运算。示例性的，如图6所示：将V_CHECK_1_OP和V_CHECK_2_OP输入逻辑电路150150的两个输入端进行与逻辑运算，输出其中一个第一中间运算结果V_CHECK_A_BUS，依次类推，逻辑电路150得到6个第一中间运算结果，分别为：V_CHECK_A_BUS、V_CHECK_B_BUS、V_CHECK_C_BUS、V_CHECK_D_BUS和V_CHECK_E_BUS、V_CHECK_F_BUS；然后将V_CHECK_A_BUS和V_CHECK_B_BUS输入逻辑电路150的另外两个输入端进行与逻辑运算，输出其中一个第二中间运算结构V_CHECK_1_SINK，依次类推，逻辑电路150进一步得到3个第二中间运算结果，分别为：V_CHECK_1_SINK、V_CHECK_2_SINK、V_CHECK_3_SINK；接着将V_CHECK_1_SINK和V_CHECK_2_SINK输入逻辑电路150的其它两个输入端进行与逻辑运算，输出V_CHECK_A_SINK；最后将V_CHECK_A_SINK和V_CHECK_3_SINK输入逻辑电路150的其它两个输入端进行与逻辑运算，逻辑电路150输出端输出最终运算结果V_CHECK_BUS。
可以理解的，若全部检测引脚110中有一个检测引脚110由于斜插被拉低为低电平，则比较电路120的输出结果经过逻辑电路150进行与逻辑运算后，逻辑电路150的输出端输出的电压V_CHECK_BUS为低电平；只有全部的检测引脚110均为第一电压，逻辑电路150的输出端输出的电压V_CHECK_BUS才会为高电平。
需要说明的是，若检测引脚110只有一个，则不需要逻辑电路150进行逻辑与计算，那么图4中比较电路120的输出端U3输出的V_CHECK_N_OP直接与供电控制端D1连接，也即V_CHECK_N_OP相当于V_CHECK_BUS。
在一种实施方式中，也可以将多个检测引脚110的电压先进行与逻辑运算后，再输入比较电路120的第一输入端U1与参考电压进行比较，那么比较电路的输出端U3输出的电平即为V_CHECK_BUS，本实施例不对此进行限定。
为了更好的理解本实施例的供电控制电路140，下面举例说明。请参考图5，供电控制电路140还包括第一开关管T和控制子电路D，第一开关管的输入端T1连接电源输入端VDD，电源输入端可以提供驱动显示屏的电源电压，如12V或其他电压，第一开关管T的输出端T2连接屏供电端PANNEL_VCC，屏开启端PANNEL_ON/OFF和输出端V_CHECK_BUS通过控制子电路D与第一开关管T的控制端T3连接。屏开启端PANNEL_ON/OFF可以连接处理器，处理器发送控制显示屏开启或关闭的信号。
其中，若逻辑电路150的输出端V_CHECK_BUS输出第一电平，且屏开启端PANNEL_ON/OFF接收到屏开启信号，则控制子电路D给第一开关管T的控制端T3提供第一信号，以使第一开关管T的输入端T1和输出端T2导通；若逻辑电路150的输出端V_CHECK_BUS输出第二电平，则控制子电路D给第一开关管T的控制端T3提供第二信号，以使第一开关管T的输入端T1和输出端T2断开。通过第一开关管T可以方便地控制电源输入端VDD和显示屏的屏供电端的PANNEL_VCC导通或断开。控制第一开关管T的控制子电路D被逻辑电路150的输出端V_CHECK_BUS和屏开启端PANNEL_ON/OFF共同控制，控制子电路D为逻辑电路，即逻辑电路150的输出端V_CHECK_BUS和屏开启端PANNEL_ON/OFF都满足条件时（如均为高电平）才能控制第一开关管T1导通，逻辑电路150的输出端V_CHECK_BUS和屏开启端PANNEL_ON/OFF有一个不满足条件（如有一个为低电平），则第一开关管T都不会导通。
其中，控制子电路D包括第二开关管K、第三开关管Q和第四开关管P，第二开关管K的控制端K3连接屏开启端PANNEL_ON/OFF，第二开关管K的输出端K2接地；第三开关管Q的输入端Q1连接逻辑电路150的输出端V_CHECK_BUS，第三开关管Q的控制端Q3通过第一电阻R1连接第二开关管K的输入端K1，第三开关管Q的输出端Q2通过第二电阻R2接地；第四开关管P的输入端P1连接第一开关管T的控制端T3，第四开关管P的输出端P2接地，第四开关管P的控制端P3连接第三开关管Q的输出端Q2。
当屏开启端PANNEL_ON/OFF输出高电平时，第二开关管K导通，将第一电阻R1的电压拉低，从而导通第三开关管Q，若逻辑电路150输出端输出的电压V_CHECK_BUS的高电平，则可以控制第四开关管P导通，进而控制第一开关管T导通。其中，第一开关管T为MOS管，第二开关管K、第四开关管P为NPN开关管，第三开关管Q为PNP开关管。
第四开关管P的输入端P1通过第三电阻R3连接第一开关管T的控制端T3，第四开关管P的输入端P1还通过第四电阻连接第一开关管T3的输入端T1。
为了更好的理解本实施例中的微电提供电路120,下面举例说明。请参考图3，微电提供电路120包括电池B、限流电阻R7、第一分压电阻R8、第二分压电阻R9和稳压基准源V，电池B的正极依次连接限流电阻R7、第一分压电阻R8和第二分压电阻R9后接地，稳压基准源V的阴极V3连接于限流电阻R7和第一分压电阻R8之间，稳压基准源V的阳极V2接地，稳压基准源V的参考脚V1连接于第一分压电阻R7和第二分压电阻R8之间，稳压基准源V的阴极V3输出第一电压,比如第一电压为50mv。
示例性的，电池B可以为纽扣电池。
示例性的，微电提供电路120还包括微电开关L，微电开关L设置于电池B和限流电阻R7之间。
当显示屏正式启动后，可以控制微电开关L断开，可以减少电池B的消耗，延长电池B的使用寿命，也可以去除微电提供电路120给显示屏带来的影响。
示例性的，微电提供电路120还包括滤波电容C，滤波电容C的一端与电池B的正极连接，另一端接地。
请参考图7，图7本申请实施例提供的指示电路的示意图，保护电路100还包括指示电路160，指示电路包括指示开关管G、报警器F和指示电阻R5，指示开关管G的控制端G3连接逻辑电路150的输出端V_CHECK_BUS，指示开关管G的输入端G1通过指示电阻R5连接供电端VDD，指示开关管G的输出端G2接地，报警器F的一端连接指示开关管G的输入端G1，报警器F的另一端接地。
当逻辑电路150的输出端V_CHECK_BUS输出高电平时，指示开关管F导通，将供电端VDD提供的电信号导入地，供电端VDD提供的电信号不会经过报警器F。当逻辑电路150的输出端V_CHECK_BUS输出低电平时，指示开关管G断开，供电端VDD提供的电信号通过报警器F，报警器F开始工作。例如，报警器F可以为LED灯，报警器F可以亮起以提示屏线斜插。又例如，报警器可以为电音转换器（如蜂鸣器），电音转换器可以发出报警声以提示屏线斜插。
在一些示例中，指示开关管G的控制端G3可以通过缓冲电阻R6连接逻辑电路150的输出端V_CHECK_BUS。
请参考图8，图8为本申请实施例提供的显示装置的结构示意图，显示装置10包括显示屏200、电路板300、屏线400和保护电路100，电路板300和显示屏200提供屏线400连接，保护电路100可以设置在电路300或显示屏200中的任意一侧，以图8为例，保护电路100设置在显示屏侧。本实施例中无论是电路板300端的屏线发生斜插或者是显示屏200端的屏线发生斜插，不给显示屏200供电，以保护显示屏200的电子元器件不会因此屏线斜插而发生损坏。具体的保护电路100请参考上文的详细描述，此处不再赘述。
请参考图9，图9为本申请实施例提供的检测方法的流程示意图，本申请实施例一种检测方法，应用于显示装置，方法包括：
在101中，给检测引脚提供第一电压；
示例性的，显示装置可以包括保护电路，保护电路可以设置在显示屏，也可以设置在电路板上，示例性的，保护电路设置有专门的微电提供电路，微电提供电路可以自带电池，电池可以给检测引脚提供第一电压，具体的保护电路请参考上文的详细描述，此处不再赘述。另一示例中，显示装置的电源电路也可以给检测引脚提供第一电压。
其中，电路板或显示屏上可以设置连接接口，屏线通过连接接口与显示屏或电路板连接，检测引脚可以位于连接接口上，检测引脚的数量可以为1个或多个，第一电压的值可以根据需要设置，例如40mV、50mV、60mV、100mV等。
在102中，检测引脚与屏线连接后，将检测引脚的电压与参考电压进行比较，参考电压小于第一电压信号；
在103中，若检测引脚的电压大于参考电压，且接收到屏开启信号，则给显示屏供电；
在104中，若检测引脚的电压小于参考电压，则不给显示屏供电。
示例性的，参考电压小于第一电压，比如可以为20mV、25mV、30mV等。由于在屏线组装工序，不会对显示屏进行上电，因此除了检测引脚提供了第一电压以外，其他引脚的连接线一般都处于低电平状态，若连接接口与屏线斜插，由于屏线的挤压，会导致检测引脚与相邻的未提供第一电压的引脚接触，导致检测引脚的电压被拉低，或者斜插时屏线作为导体也可能会把检测引脚与相邻的未提供第一电压的引脚相导通，进而使检测引脚的电压被拉低，如变为0V或小于10mV。因此，当检测引脚与屏线连接后，将检测引脚的电压与参考电压进行比较，若屏线与连接接口正常插接，则检测引脚的电压大于参考电压，且接收到屏开启信号，则给显示屏供电。若检测引脚的电压小于参考电压，说明屏线斜插，则不给显示屏供电。示例性的，若具有多个检测引脚，则给每一个检测引脚提供第一电压；多个检测引脚与屏线连接后，将每一个检测引脚的电压与参考电压进行比较，若每一个检测引脚的电压全部都大于参考电压，且接收到屏开启信号，则给显示屏供电；若其中任意一个检测引脚的电压小于参考电压，则不给显示屏供电。
从而本实施例中的检测方法可以保护显示屏不会因为屏线斜插导致其内部电子器件损坏，解决了生产作业上的屏线斜插短路造成上电烧元器件的质量安全问题
在上述实施例中，对各个实施例的描述都各有侧重，某个实施例中没有详述的部分，可以参见上文针对保护电路的详细描述，此处不再赘述。
以上对本申请实施例所提供的保护电路、显示屏和检测方法进行了详细介绍，本文中应用了具体个例对本申请的原理及实施方式进行了阐述，以上实施例的说明只是用于帮助理解本申请的方法及其核心思想；同时，对于本领域的技术人员，依据本申请的思想，在具体实施方式及应用范围上均会有改变之处，综上，本说明书内容不应理解为对本申请的限制。
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- 一种保护电路，应用于显示装置，其中，包括：检测引脚，所述检测引脚与屏线连接；微电提供电路，与所述检测引脚连接，能够给所述检测引脚提供第一电压；比较电路，包括第一输入端、第二输入端和输出端，所述第一输入端连接所述检测引脚，所述第二输入端传输参考电压，若所述第一输入端的电压大于所述参考电压，则所述比较电路的输出端输出第一电平，否则所述比较电路的输出端输出第二电平，所述参考电压小于所述第一电压；供电控制电路，与所述比较电路连接，若所述比较电路的输出端输出所述第一电平，则所述供电控制电路用于控制所述显示装置的显示屏与电源导通；若所述比较电路的输出端输出所述第二电平，则所述供电控制电路用于控制所述显示装置的显示屏与电源断开。
- 根据权利要求1所述的保护电路，其中，所述供电控制电路包括电源输入端、屏供电端、屏开启端和供电控制端，所述电源输入端用于连接电源，所述屏供电端用于连接所述显示屏的电源引脚，所述屏开启端用于接收屏开启信号，所述供电控制端连接所述比较电路的输出端；若所述比较电路的输出端输出所述第一电平，且所述屏开启端接收到屏开启信号，则所述供电控制电路控制所述电源输入端和所述屏供电端导通；若所述比较电路的输出端输出所述第二电平，则所述供电控制电路控制所述电源输入端和所述屏供电端断开。
- 根据权利要求2所述的保护电路，其中，所述检测引脚为多个，多个所述检测引脚分别连接多个所述比较电路，所述供电控制电路包括：逻辑电路，所述逻辑电路多个输入端中的每一个输入端分别与一个所述比较电路的输出端连接，所述逻辑电路的输出端连接所述供电控制端，所述逻辑电路能够将多个所述比较电路的输出端电平进行与逻辑运算后输出。
- 根据权利要求3所述的保护电路，其中，所述供电控制电路还包括第一开关管、控制子电路，所述第一开关管的输入端连接电源输入端，所述第一开关管的输出端连接屏供电端，所述屏开启端和所述输出端通过所述控制子电路与所述第一开关管的控制端连接；其中，若所述逻辑电路的输出端也输出所述第一电平，且所述屏开启端接收到屏开启信号，则所述控制子电路给所述第一开关管的控制端提供第一信号，以使所述第一开关管的输入端和输出端导通；若所述逻辑电路的输出端也输出所述第二电平，则所述控制子电路给所述第一开关管的控制端提供第二信号，以使所述第一开关管的输入端和输出端断开。
- 根据权利要求4所述的保护电路，其中，所述控制子电路包括第二开关管、第三开关管和第四开关管，所述第二开关管的控制端连接所述屏开启端，所述第二开关管的输出端接地；所述第三开关管的输入端连接所述逻辑电路的输出端，所述第三开关管的控制端通过第一电阻连接所述第二开关管的输入端，所述第三开关管的输出端通过第二电阻接地；所述第四开关管的输入端连接所述第一开关管的控制端，所述第四开关管的输出端接地，所述第四开关管的控制端连接所述第三开关管的输出端。
- 根据权利要求5所述的保护电路，其中，所述第四开关管的输入端通过所述第三电阻连接所述第一开关管的控制端，所述第四开关管的输入端通过所述第四电阻连接所述第一开关管的输入端。
- 根据权利要求5所述的保护电路，其中，所述第一开关管为MOS管，所述第二开关管和所述第四开关管为NPN开关管，所述第三开关管为PNP开关管。
- 根据权利要求3所述的保护电路，其中，所述保护电路还包括：指示电路，包括指示开关管、报警器和指示电阻，所述指示开关管的控制端连接所述逻辑电路的输出端，所述指示开关管的输入端通过所述指示电阻连接供电端，所述指示开关管的输出端接地，所述报警器的一端连接所述指示开关管的输入端，所述报警器的另一端接地。
- 根据权利要求8所述的保护电路，其中，所述指示开关管的控制端通过缓冲电阻连接所述逻辑电路的输出端。
- 根据权利要求2所述的保护电路，其中，所述显示装置的显示屏或电路板上设置有连接接口，所述屏线通过所述连接接口与所述显示屏或所述电路板连接，所述检测引脚设置在所述连接接口。
- 根据权利要求10所述的保护电路，其中，多个所述检测引脚间隔设置于所述连接接口。
- 根据权利要求1所述的保护电路，其中，所述微电提供电路包括电池、限流电阻、第一分压电阻、第二分压电阻和稳压基准源，所述电池的正极依次连接所述限流电阻、所述第一分压电阻和所述第二分压电阻后接地，所述稳压基准源的阴极连接于所述限流电阻和所述第一分压电阻之间，所述稳压基准源的阳极接地，所述稳压基准源的参考脚连接于所述第一分压电阻和所述第二分压电阻之间，所述稳压基准源的阴极输出所述第一电压。
- 根据权利要求12所述的保护电路，其中，所述微电提供电路还包括微电开关，所述微电开关设置于所述电池和所述限流电阻之间。
- 根据权利要求12所述的保护电路，其中，所述微电提供电路还包括滤波电容，所述滤波电容的一端与所述电池的正极连接，另一端接地。
- 根据权利要求1所述的保护电路，其中，所述检测引脚为电源引脚，与所述电源引脚相邻的其他引脚为低电平引脚；或者所述检测引脚相邻接地引脚。
- 一种显示装置，其中，所述显示装置包括：显示屏；电路板；屏线，所述显示屏通过所述屏线与所述电路板连接；保护电路，所述保护电路设置在所述显示屏或所述电路板，所述保护电路包括：检测引脚，所述检测引脚与屏线连接；微电提供电路，与所述检测引脚连接，能够给所述检测引脚提供第一电压；比较电路，包括第一输入端、第二输入端和输出端，所述第一输入端连接所述检测引脚，所述第二输入端传输参考电压，若所述第一输入端的电压大于所述参考电压，则所述比较电路的输出端输出第一电平，否则所述比较电路的输出端输出第二电平，所述参考电压小于所述第一电压；供电控制电路，与所述比较电路连接，若所述比较电路的输出端输出所述第一电平，则所述供电控制电路用于控制所述显示装置的显示屏与电源导通；若所述比较电路的输出端输出所述第二电平，则所述供电控制电路用于控制所述显示装置的显示屏与电源断开。
- 根据权利要求15所述的显示装置，其中，所述供电控制电路包括电源输入端、屏供电端、屏开启端和供电控制端，所述电源输入端用于连接电源，所述屏供电端用于连接所述显示屏的电源引脚，所述屏开启端用于接收屏开启信号，所述供电控制端连接所述比较电路的输出端；若所述比较电路的输出端输出所述第一电平，且所述屏开启端接收到屏开启信号，则所述供电控制电路控制所述电源输入端和所述屏供电端导通；若所述比较电路的输出端输出所述第二电平，则所述供电控制电路控制所述电源输入端和所述屏供电端断开。
- 根据权利要求16所述的显示装置，其中，所述检测引脚为多个，多个所述检测引脚分别连接多个所述比较电路，所述供电控制电路包括：逻辑电路，所述逻辑电路多个输入端中的每一个输入端分别与一个所述比较电路的输出端连接，所述逻辑电路的输出端连接所述供电控制端，所述逻辑电路能够将多个所述比较电路的输出端电平进行与逻辑运算后输出。
- 根据权利要求17所述的显示装置，其中，所述供电控制电路还包括第一开关管、控制子电路，所述第一开关管的输入端连接电源输入端，所述第一开关管的输出端连接屏供电端，所述屏开启端和所述输出端通过所述控制子电路与所述第一开关管的控制端连接；其中，若所述逻辑电路的输出端也输出所述第一电平，且所述屏开启端接收到屏开启信号，则所述控制子电路给所述第一开关管的控制端提供第一信号，以使所述第一开关管的输入端和输出端导通；若所述逻辑电路的输出端也输出所述第二电平，则所述控制子电路给所述第一开关管的控制端提供第二信号，以使所述第一开关管的输入端和输出端断开。
- 根据权利要求18所述的显示装置，其中，所述控制子电路包括第二开关管、第三开关管和第四开关管，所述第二开关管的控制端连接所述屏开启端，所述第二开关管的输出端接地；所述第三开关管的输入端连接所述逻辑电路的输出端，所述第三开关管的控制端通过第一电阻连接所述第二开关管的输入端，所述第三开关管的输出端通过第二电阻接地；所述第四开关管的输入端连接所述第一开关管的控制端，所述第四开关管的输出端接地，所述第四开关管的控制端连接所述第三开关管的输出端。
- 一种检测方法，应用于显示装置，其中，所述方法包括：给检测引脚提供第一电压；所述检测引脚与屏线连接后，将所述检测引脚的电压与参考电压进行比较，所述参考电压小于所述第一电压信号；若所述检测引脚的电压大于所述参考电压，且接收到屏开启信号，则给所述显示屏供电；若所述检测引脚的电压小于所述参考电压，则不给所述显示屏供电。
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