CN117116226A - Protection circuit, display device and detection method - Google Patents

Protection circuit, display device and detection method Download PDF

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Publication number
CN117116226A
CN117116226A CN202211486620.1A CN202211486620A CN117116226A CN 117116226 A CN117116226 A CN 117116226A CN 202211486620 A CN202211486620 A CN 202211486620A CN 117116226 A CN117116226 A CN 117116226A
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CN
China
Prior art keywords
circuit
voltage
power supply
switching tube
screen
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202211486620.1A
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Chinese (zh)
Inventor
杨萧
李林
汤旺
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Huizhou Shiwei New Technology Co Ltd
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Huizhou Shiwei New Technology Co Ltd
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Publication date
Application filed by Huizhou Shiwei New Technology Co Ltd filed Critical Huizhou Shiwei New Technology Co Ltd
Priority to CN202211486620.1A priority Critical patent/CN117116226A/en
Publication of CN117116226A publication Critical patent/CN117116226A/en
Pending legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
    • G01R19/165—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G5/00—Control arrangements or circuits for visual indicators common to cathode-ray tube indicators and other visual indicators
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
    • H02H3/24—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to undervoltage or no-voltage
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2330/00—Aspects of power supply; Aspects of display protection and defect management
    • G09G2330/02—Details of power systems and of start or stop of display operation
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2330/00—Aspects of power supply; Aspects of display protection and defect management
    • G09G2330/04—Display protection
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2330/00—Aspects of power supply; Aspects of display protection and defect management
    • G09G2330/12—Test circuits or failure detection circuits included in a display system, as permanent part thereof

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Computer Hardware Design (AREA)
  • Theoretical Computer Science (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)

Abstract

A protection circuit, a display screen and a detection method comprise the following steps: the detection pin is connected with the screen wire; the micro-electricity supply circuit is connected with the detection pin and supplies a first voltage to the detection pin; the comparison circuit comprises a first input end, a second input end and an output end, wherein the first input end is connected with the detection pin, the second input end transmits reference voltage, if the voltage of the first input end is larger than the reference voltage, the output end outputs a first level, otherwise, the output end outputs a second level, and the reference voltage is smaller than the first voltage; the power supply control circuit is connected with the comparison circuit, and is used for controlling the display screen to be conducted with the power supply if the output end outputs the first level; and if the output end outputs the second level, the power supply control circuit is used for controlling the disconnection of the display screen and the power supply. The embodiment of the application can solve the quality safety problem of power-on burning out electronic components caused by oblique insertion short circuit of the screen wire in production operation.

Description

Protection circuit, display device and detection method
Technical Field
The present application relates to the field of electronic technologies, and in particular, to a protection circuit, a display device, and a detection method.
Background
The low-cost TCONLESS scheme has become the mainstream of the screen matching design in the current television industry, and accordingly, when a factory is used for producing and assembling a television, screen wire stations are arranged on a TCONLESS interface of a core board, the quality safety problem that power-on burns out electronic components due to poor oblique insertion of screen wires is easy to occur, the timeliness of factory production is reduced, and hidden danger on a factory operating line is increased.
Disclosure of Invention
The embodiment of the application provides a protection circuit, a display device and a detection method, which can solve the quality safety problem of power-on burning out of electronic components caused by oblique insertion short circuit of a screen wire in production operation.
In a first aspect, an embodiment of the present application provides a protection circuit applied to a display device, including:
the detection pin is connected with the screen wire;
the micro-electricity supply circuit is connected with the detection pin and supplies a first voltage to the detection pin;
the comparison circuit comprises a first input end, a second input end and an output end, wherein the first input end is connected with the detection pin, the second input end transmits reference voltage, if the voltage of the first input end is larger than the reference voltage, the output end of the comparison circuit outputs a first level, otherwise, the output end of the comparison circuit outputs a second level, and the reference voltage is smaller than the first voltage;
the power supply control circuit is connected with the comparison circuit, and is used for controlling the display screen to be conducted with a power supply if the output end of the comparison circuit outputs the first level; and if the output end of the comparison circuit outputs the second level, the power supply control circuit is used for controlling the disconnection between the display screen and the power supply.
Optionally, the power supply control circuit includes a power input end, a screen power supply end, a screen opening end and a power supply control end, wherein the power input end is used for connecting a power supply, the screen power supply end is used for connecting a power supply pin of the display screen, the screen opening end is used for receiving a screen opening signal, and the power supply control end is connected with an output end of the comparison circuit;
if the output end of the comparison circuit outputs the first level and the screen opening end receives a screen opening signal, the power supply control circuit controls the power supply input end and the screen power supply end to be conducted;
and if the output end of the comparison circuit outputs the second level, the power supply control circuit controls the power supply input end and the screen power supply end to be disconnected.
Optionally, the detection pin is a plurality of, and a plurality of detection pins are connected a plurality of respectively the comparison circuit, the power supply control circuit includes:
and each input end of the logic circuit is respectively connected with the output end of one comparison circuit, the output end of the logic circuit is connected with the power supply control end, and the logic circuit can output the output end level of the comparison circuits after AND logic operation.
Optionally, the power supply control circuit further includes a first switching tube and a control sub-circuit, an input end of the first switching tube is connected with a power supply input end, an output end of the first switching tube is connected with a screen power supply end, and a screen opening end and the output end are connected with a control end of the first switching tube through the control sub-circuit;
if the output end of the logic circuit also outputs the first level and the screen opening end receives a screen opening signal, the control sub-circuit provides a first signal for the control end of the first switching tube so as to conduct the input end and the output end of the first switching tube;
and if the output end of the logic circuit also outputs the second level, the control sub-circuit provides a second signal for the control end of the first switching tube so as to disconnect the input end and the output end of the first switching tube.
Optionally, the control sub-circuit includes a second switching tube, a third switching tube and a fourth switching tube, a control end of the second switching tube is connected with the screen opening end, and an output end of the second switching tube is grounded;
the input end of the third switching tube is connected with the output end of the logic circuit, the control end of the third switching tube is connected with the input end of the second switching tube through a first resistor, and the output end of the third switching tube is grounded through a second resistor;
the input end of the fourth switching tube is connected with the control end of the first switching tube, the output end of the fourth switching tube is grounded, and the control end of the fourth switching tube is connected with the output end of the third switching tube.
Optionally, 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 with the output end of the logic circuit, the input end of the indicating switch tube is connected with 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 with the input end of the indicating switch tube, and the other end of the alarm is grounded.
Optionally, the micro-electricity provides the circuit and includes battery, current-limiting resistor, first bleeder resistor, second bleeder resistor and steady voltage reference source, the positive pole of battery connects gradually the current-limiting resistor first bleeder resistor with ground connection behind the second bleeder resistor, the negative pole of steady voltage reference source connect in current-limiting resistor with between the first bleeder resistor, the positive pole ground connection of steady voltage reference source, the reference foot of steady voltage reference source connect in between the first bleeder resistor with the second bleeder resistor, the negative pole of steady voltage reference source exports the first voltage.
Optionally, the micro-electric providing circuit further comprises a micro-electric switch, and the micro-electric switch is arranged between the battery and the current limiting resistor.
Optionally, the detection pin is a power pin, and other pins adjacent to the power pin are low-level pins; or the detection pins are adjacently pins.
In a second aspect, an embodiment of the present application provides a display device including:
a display screen;
a circuit board;
the display screen is connected with the circuit board through the screen wire;
a protection circuit as claimed in any one of the preceding claims, the protection circuit being provided on the display screen or the circuit board.
In a third aspect, an embodiment of the present application provides a detection method, applied to a display device, where the method includes:
providing a first voltage to the detection pin;
after the detection pin is connected with the screen wire, comparing the voltage of the detection pin with a reference voltage, wherein the reference voltage is smaller than the first voltage signal;
if the voltage of the detection pin is larger than the reference voltage and a screen opening signal is received, supplying power to the display screen;
and if the voltage of the detection pin is smaller than the reference voltage, not supplying power to the display screen.
In the embodiment provided by the application, the first voltage is provided for the detection pin, the voltage of the detection pin is compared with the reference voltage by the comparison circuit after the detection pin is connected with the screen wire, if the screen wire is normally spliced with the connection interface, the voltage of the detection pin is the first voltage, namely the voltage is larger than the reference voltage, the comparison circuit correspondingly outputs the first level, and the power supply control circuit controls the display screen to normally supply power. If the screen wire is obliquely inserted with the connecting interface, the detection pin is in contact with the adjacent pin which does not provide the first voltage due to extrusion of the screen wire, so that the voltage of the detection pin is pulled down, or the screen wire is used as a conductor during oblique insertion, the detection pin is possibly conducted with the adjacent pin which does not provide the first voltage, so that the voltage of the detection pin is pulled down, the voltage of the detection pin is less than the reference voltage, the comparison circuit correspondingly outputs the second level, the power supply control circuit controls not to supply power to the display screen, the display screen is protected from being damaged by internal electronic devices caused by oblique insertion of the screen wire, and the quality safety problem that the electronic components are burnt out due to power-on caused by oblique insertion short circuit of the screen wire in production operation is solved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the description of the embodiments will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic structural diagram of a protection circuit according to an embodiment of the present application;
fig. 2 is a schematic distribution diagram of detection pins according to an embodiment of the present application;
FIG. 3 is a schematic diagram of a micro-electro-mechanical providing circuit according to an embodiment of the present application;
FIG. 4 is a schematic diagram of a comparison circuit according to an embodiment of the present application;
fig. 5 is a schematic circuit diagram of a power supply control circuit according to an embodiment of the present application;
FIG. 6 is a diagram illustrating a logic circuit and a logic operation according to an embodiment of the present application;
FIG. 7 is a schematic diagram of an indication circuit according to an embodiment of the present application;
fig. 8 is a schematic structural diagram of a display device according to an embodiment of the present application;
fig. 9 is a schematic flow chart of a detection method according to an embodiment of the present application.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. It will be apparent that the described embodiments are only some, but not all, embodiments of the application. The following description of at least one exemplary embodiment is merely exemplary in nature and is in no way intended to limit the application, its application, or uses. All other embodiments, which can be made by a person skilled in the art without any inventive effort, are intended to be within the scope of the present application based on the embodiments of the present application.
The embodiment of the application provides a protection circuit 100, the protection circuit 100 is applied to a display device, for example, the display device can be a display device such as a television, a computer, a tablet personal computer and the like, the display device can comprise a display screen, a circuit board and a protection circuit, wherein the display screen and the circuit board can be connected through a screen wire, the protection circuit 100 can be arranged on the display screen or the circuit board, and the protection circuit 100 comprises a detection pin 110, a micro-electric providing circuit 120, a comparison circuit 130 and a power supply control circuit 140. Referring to fig. 1 to 5, fig. 1 is a schematic structural diagram of a protection circuit according to an embodiment of the application. Fig. 2 is a schematic diagram of distribution of detection pins provided by an embodiment of the present application, fig. 3 is a schematic diagram of a micro-power supply circuit provided by an embodiment of the present application, fig. 4 is a schematic diagram of a comparison circuit provided by an embodiment of the present application, and fig. 5 is a schematic diagram of a power supply control circuit provided by an embodiment of the present application.
The detection pin 110 is connected to a screen wire.
The micro-power supply circuit 120 is connected to the detection pin 110 and is capable of supplying a first voltage to the detection pin 110.
The comparison circuit 130 includes a first input end U1, a second input end U2, and an output end U3 of the comparison circuit, where the first input end U1 is connected to the detection pin 110, the second input end U2 is connected to the reference voltage, if the voltage of the detection pin 110 is greater than the reference voltage, the output end U3 of the comparison circuit outputs a first level, otherwise, the output end 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 with the comparison circuit 130, and if the output end U3 of the comparison circuit outputs a first level, the power supply control circuit 140 is used for controlling the display screen to be conducted with the power supply; if the output terminal U3 of the comparing circuit outputs the second level, the power supply control circuit 140 is configured to control the display screen to be disconnected from the power supply.
In the protection circuit 100, a first voltage is provided to the detection pin 110 of the connection interface, after the detection pin 110 is connected with the screen, the voltage of the detection pin 110 is compared with a reference voltage, if the screen 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 correspondingly outputs a first level, and the power supply control circuit 140 controls to normally supply power to the display screen. If the screen wire is obliquely inserted into the connection interface, the detection pin 110 is in contact with an adjacent pin which does not provide the first voltage due to extrusion of the screen wire, so that the voltage of the detection pin 110 is pulled down, or the screen wire is used as a conductor during oblique insertion, the detection pin 110 is possibly conducted with an adjacent pin which does not provide the first voltage, so that the voltage of the detection pin 110 is pulled down, the voltage of the detection pin 110 is less than the reference voltage, the comparison circuit 130 correspondingly outputs the second level, the power supply control circuit 140 controls not to supply power to the display screen, the display screen is prevented from being damaged due to oblique insertion of the screen wire, and the quality safety problem of a power-on burning component caused by oblique insertion short circuit of the screen wire in production operation is solved.
For example, referring to fig. 5, the power supply control circuit 140 includes a power input terminal VDD, a panel power supply terminal pannel_vcc, a panel power ON terminal pannel_on/OFF, and a power supply control terminal D1, wherein the power input terminal VDD is used for connecting a power source, the panel power supply terminal pannel_vcc is used for connecting a power pin of a display panel, the panel power ON terminal pannel_on/OFF is used for receiving a panel power ON signal, and the power supply control terminal D1 is connected to an output terminal U3 of the comparison circuit.
If the output terminal U3 of the comparison circuit outputs the first level and the panel ON terminal pannel_on/OFF receives the panel ON signal, the power supply control circuit 140 controls the power supply input terminal VDD and the panel power supply terminal pannel_vcc to be turned ON; if the output terminal U3 of the comparing circuit outputs the second level, the power supply control circuit 140 controls the power supply input terminal VDD and the panel power supply terminal pannel_vcc to be disconnected.
The display device further includes a screen wire, one end of the screen wire is connected to the display screen, and the other end of the screen wire is connected to the circuit board, and the circuit board or the display screen may be provided with a connection interface, where the screen wire may be connected to the display screen or the circuit board through the connection interface, and the detection pin 110 may be provided at the connection interface. For a better understanding of the sense pin 110, the sense pin 110 is illustrated below. The detection pins 110 of the connection interface can be set according to the requirement, the number of the detection pins 110 is multiple, and the multiple detection pins 110 are arranged at intervals on the connection interface, so that when pins at different positions of the screen wire are obliquely inserted, the pins can be detected. Referring to fig. 2, the connection interface of the display screen or the circuit board may include a left connection interface and a right connection interface, and 12 detection pins 110 are disposed on the left connection interface and the right connection interface, and a first voltage is provided to the 12 detection pins 110, where, as shown in fig. 2, voltages of the 12 detection pins 110 are v_check_1 to v_check_12, respectively.
For example, the detection pin 110 may be a power pin, such as v_check_4, v_check_5, v_check_6, and the like in fig. 2, and the micro-electric supply circuit 120 may provide a relatively low voltage, i.e., a first voltage, to the power pin, and the value of the first voltage may be set as required, for example, 40mV, 50mV, 60mV, 100mV, and the like. The screen line includes the power connecting wire of being connected with the power pin, still include the connecting wire of being connected with other pins that the power pin is adjacent, if screen line and connection interface insert to one side, the power pin can be connected with the connecting wire next door of the power connecting wire in the screen line, because at screen line equipment process, can not go on the electricity to the display screen, consequently except that detect pin 110 provides first voltage, the connecting wire of other pins is in low level state generally, and then makes the voltage of power pin pulled down, if become 0V or less than 10mV. It should be noted that, the power supply pin is selected as the detection pin 110 because the voltage is in the level of several volts when the power supply pin is in normal operation, and even if the display screen is powered on, the power supply pin still has a relatively low first voltage residue, the normal operation of the power supply pin is not affected.
In another example, the detection pins 110 may be adjacent pins, such as corresponding pins V_CHECK_1, V_CHECK_2, V_CHECK_3, etc. in FIG. 2. That is, a pin next to the ground pin is set as the detection pin 110, and a first voltage is supplied. If the screen line is obliquely inserted into the connection interface, the detection pin 110 is connected to a connection line beside the screen line, which is connected to the ground pin, so that the voltage of the detection pin 110 is pulled down, for example, to 0V or less than 10mV. It should be noted that, based on the line sequence design of the screen line of the existing display screen, the pins adjacent to the ground pins are generally not used for transmitting differential data, so that even after the display screen is powered on, the pins adjacent to the ground pins still have relatively low first voltage residues, and the influence on data transmission of the screen line is small.
It should be noted that, the number of connection interfaces at the display screen or the circuit board end for connection with the screen line may be set according to design requirements, for example, may be 1 or 3, etc., and the number of the detection pins 110 may be set according to requirements, for example, may be 1, 8, 15, etc., which is not limited in this embodiment.
Referring to fig. 4 and fig. 6, fig. 6 is a schematic diagram of a logic circuit and a logic operation according to an embodiment of the application.
In this embodiment, if the connection interface has a plurality of detection pins 110, the plurality of detection pins 110 are respectively connected to the plurality of comparison circuits 120. The power supply control circuit 140 may further include a logic circuit 150, where each of a plurality of input terminals of the logic circuit 150 is connected to an output terminal U3 of one comparison circuit, an output terminal of the logic circuit 150 is connected to the power supply control terminal D1, and the logic circuit 150 can perform an and logic operation on the levels of the output terminals U3 of the plurality of comparison circuits and output the level, for example, the voltage output by the output terminal of the logic circuit 150 is v_check_bus.
Specifically, the comparing circuit 120 includes a low noise operational amplifier U, where the low noise operational amplifier U includes a first input terminal U1, a second input terminal U2, and an output terminal U3 of the comparing circuit, the first input terminal U1 is connected to a detection pin 110, the second input terminal U2 is connected to a reference voltage, for example, 25mv, the voltage v_check_n of the detection pin 110 is compared with the reference voltage, if the voltage v_check_n of the detection pin 110 is greater than the reference voltage, the level v_check_n_op output by the output terminal U3 of the comparing circuit is the first level, otherwise, the level v_check_n_op output by the output terminal U3 of the comparing circuit is the second level, for example, the first level is the high level, and the second level is the low level.
The output terminals U3 of the plurality of comparison circuits are connected to the logic circuit 150 to perform an and logic operation, and for example, the number of the detection pins 110 is 12, the 12 detection pins 110 are respectively connected to the 12 comparison circuits 120, the output terminals U3 of the 12 comparison circuits respectively output 12 comparison results v_check_1_op to v_check_12_op, and the output terminals U3 of the 12 comparison circuits are input to the logic circuit 150 to perform an and logic operation. Exemplary, as shown in fig. 6: the two input terminals of v_check_1_op and v_check_2_op input to the logic circuit 150150 perform an and logic operation, and output one of the first intermediate operation results v_check_a_bus, and so on, and the logic circuit 150 obtains 6 first intermediate operation results, which are respectively: V_CHECK_A_BUS, V_CHECK_B_BUS, V_CHECK_C_BUS, V_CHECK_D_BUS and V_CHECK_E_BUS, V_CHECK_F_BUS; then, the other two input ends of the v_check_a_bus and the v_check_b_bus are input into the logic circuit 150 to perform and logic operation, one of the second intermediate operation structures v_check_1_si NK is output, and so on, the logic circuit 150 further obtains 3 second intermediate operation results, which are respectively: v_check_1_si NK, v_check_2_si NK, v_check_3_si NK; then, the other two input terminals of the v_check_1_si NK and v_check_2_si NK input logic circuit 150 perform an and logic operation, and output v_check_a_si NK; finally, the other two input terminals of the v_check_a_si NK and v_check_3_si NK input to the logic circuit 150 perform an and logic operation, and the output terminal of the logic circuit 150 outputs the final operation result v_check_bus.
It can be understood that if one of the detection pins 110 is pulled down to a low level due to the oblique insertion, the output result of the comparison circuit 120 is subjected to an and logic operation by the logic circuit 150, and the voltage v_check_bus output by the output end of the logic circuit 150 is at a low level; only the voltage v_check_bus output from the output terminal of the logic circuit 150 is at the high level if all the detection pins 110 are at the first voltage.
It should be noted that if there is only one detection pin 110, the logic circuit 150 is not required to perform the logic and calculation, and the v_check_n_op output by the output terminal U3 of the comparison circuit 120 in fig. 4 is directly connected to the power supply control terminal D1, that is, the v_check_n_op corresponds to the v_check_bus.
In one embodiment, the voltage of the plurality of detection pins 110 may be subjected to an and logic operation, and then input into the first input terminal U1 of the comparison circuit 120 for comparison with the reference voltage, and the level output by the output terminal U3 of the comparison circuit is v_check_bus.
For a better understanding of the power supply control circuit 140 of the present embodiment, the following is exemplified. Referring to fig. 5, the power supply control circuit 140 further includes a first switching tube T and a control sub-circuit D, wherein an input terminal T1 of the first switching tube is connected to a power input terminal VDD, the power input terminal can provide a power voltage for driving the display screen, such as 12V or other voltages, an output terminal T2 of the first switching tube T is connected to a screen power supply terminal pannel_vcc, and a screen opening terminal pannel_on/OFF and an output terminal v_check_bus are connected to a control terminal T3 of the first switching tube T through the control sub-circuit D. The screen ON-end PANNEL ON/OFF may be connected to a processor, which sends a signal to control the ON or OFF of the display screen.
If the output terminal v_check_bus of the logic circuit 150 outputs the first level and the panel ON terminal pannel_on/OFF receives the panel ON signal, the control sub-circuit D provides the first signal to the control terminal T3 of the first switching tube T to turn ON the input terminal T1 and the output terminal T2 of the first switching tube T; if the output terminal v_check_bus of the logic circuit 150 outputs the second level, the control sub-circuit D provides the second signal to the control terminal T3 of the first switching tube T to disconnect the input terminal T1 and the output terminal T2 of the first switching tube T. The first switching tube T can conveniently control the connection or disconnection of the power input end VDD and the PANNEL_VCC of the screen power supply end of the display screen. The control sub-circuit D for controlling the first switching transistor T is controlled by the output terminal v_check_bus and the panel ON terminal pannel_on/OFF of the logic circuit 150, and the control sub-circuit D is a logic circuit, that is, when the output terminal v_check_bus and the panel ON terminal pannel_on/OFF of the logic circuit 150 meet the conditions (e.g., are both at high level), the first switching transistor T1 can be controlled to be turned ON, and when the output terminal v_check_bus and the panel ON terminal pannel_on/OFF of the logic circuit 150 have an unsatisfied condition (e.g., have a low level), the first switching transistor T will not be turned ON.
The control sub-circuit D comprises a second switching tube K, a third switching tube Q and a fourth switching tube P, wherein a control end K3 of the second switching tube K is connected with a screen opening end PANNEL_ON/OFF, and an output end K2 of the second switching tube K is grounded; the input end Q1 of the third switching tube Q is connected with the output end V_CHECK_BUS of the logic circuit 150, the control end Q3 of the third switching tube Q is connected with the input end K1 of the second switching tube K through a first resistor R1, and the output end Q2 of the third switching tube Q is grounded through a second resistor R2; the input end P1 of the fourth switching tube P is connected with the control end T3 of the first switching tube T, the output end P2 of the fourth switching tube P is grounded, and the control end P3 of the fourth switching tube P is connected with the output end Q2 of the third switching tube Q.
When the panel ON-end PANNEL_ON/OFF outputs high level, the second switching tube K is conducted, the voltage of the first resistor R1 is pulled down, so that the third switching tube Q is conducted, and if the voltage V_CHECK_BUS output by the output end of the logic circuit 150 is high level, the fourth switching tube P can be controlled to be conducted, and then the first switching tube T is controlled to be conducted. The first switching tube T is a MOS tube, the second switching tube K and the fourth switching tube P are NPN switching tubes, and the third switching tube Q is a PNP switching tube.
The input end P1 of the fourth switching tube P is connected with the control end T3 of the first switching tube T through a third resistor R3, and the input end P1 of the fourth switching tube P is also connected with the input end T1 of the first switching tube T3 through a fourth resistor.
For a better understanding of the micro-electrical supply circuit 120 in this embodiment, it is exemplified below. Referring to fig. 3, the micro-power supply 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, wherein the positive electrode of the battery B is sequentially connected to the current-limiting resistor R7, the first voltage-dividing resistor R8, and the second voltage-dividing resistor R9 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.
For example, battery B may be a button cell battery.
Illustratively, the micro-electrical supply circuit 120 further includes a micro-electrical switch L disposed between the battery B and the current limiting resistor R7.
When the display screen is formally started, the micro-electric switch L can be controlled to be turned off, so that the consumption of the battery B can be reduced, the service life of the battery B can be prolonged, and the influence of the micro-electric supply circuit 120 on the display screen can be removed.
Illustratively, the micro-electric providing circuit 120 further includes a filter capacitor C, one end of which is connected to the positive electrode of the battery B, and the other end of which is grounded.
Referring to fig. 7, fig. 7 is a schematic diagram of an indication circuit provided in the embodiment of the present application, the protection circuit 100 further includes an indication circuit 160, the indication circuit includes an indication switch tube G, an alarm F and an indication resistor R5, a control end G3 of the indication switch tube G is connected to an output end v_check_bus of the logic circuit 150, an input end G1 of the indication switch tube G is connected to a power supply end VDD through the indication resistor R5, an 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.
When the output terminal v_check_bus of the logic circuit 150 outputs a high level, the switch tube F is instructed to be turned on, the electric signal provided by the power supply terminal VDD is led to the ground, and the electric signal provided by the power supply terminal VDD does not pass through the alarm F. When the output terminal v_check_bus of the logic circuit 150 outputs a low level, the switching tube G is instructed to be turned off, and the electric signal provided by the power supply terminal VDD passes through the alarm F, and the alarm F starts to operate. For example, alarm F may be an LED light and may illuminate to indicate that the screen is being inserted obliquely. For another example, the alarm may be an electrical-to-acoustic transducer (e.g., a buzzer) that sounds an alarm to alert the screen wire to be inserted obliquely.
In some examples, control terminal G3 of indication switch tube G may be connected to output terminal v_check_bus of logic circuit 150 through buffer resistor R6.
Referring to fig. 8, fig. 8 is a schematic structural diagram of a display device according to an embodiment of the present application, where 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 may be disposed on either side of the circuit 300 or the display screen 200, and the protection circuit 100 is disposed on the display screen side as illustrated in fig. 8. In this embodiment, no matter the screen wires at the end of the circuit board 300 are inserted obliquely or the screen wires at the end of the display screen 200 are inserted obliquely, no power is supplied to the display screen 200, so that the electronic components of the display screen 200 are protected from being damaged due to the oblique insertion of the screen wires. The specific protection circuit 100 is described in detail above, and will not be described here.
Referring to fig. 9, fig. 9 is a flow chart of a detection method according to an embodiment of the present application, and the detection method is applied to a display device, and includes:
in 101, providing a first voltage to a sense pin;
the display device may include a protection circuit, where the protection circuit may be disposed on the display screen or on the circuit board, and the protection circuit is provided with a dedicated micro-electric providing circuit, where the micro-electric providing circuit may be self-charged, and the battery may provide the first voltage to the detection pin, and the detailed description of the protection circuit is omitted herein. In another example, the power circuit of the display device may also provide the first voltage to the detection pin.
Wherein, can set up connection interface on circuit board or the display screen, the screen line passes through connection interface and is connected with display screen or circuit board, and detection pin can be located connection interface, and the quantity of detection pin can be 1 or more, and the value of first voltage can be set up as required, for example 40mV, 50mV, 60mV, 100mV etc..
In 102, after the detection pin is connected with the screen line, comparing the voltage of the detection pin with a reference voltage, wherein the reference voltage is smaller than a first voltage signal;
in 103, if the voltage of the detection pin is greater than the reference voltage and a screen opening signal is received, power is supplied to the display screen;
in 104, if the voltage of the detection pin is less than the reference voltage, power is not supplied to the display screen.
Illustratively, the reference voltage is less than the first voltage, such as may be 20mV, 25mV, 30mV, etc. Because the screen line assembly procedure can not power on the display screen, the connecting wires of other pins except the first voltage provided by the detection pins are generally in a low level state, if the connecting interface is obliquely inserted with the screen line, the detection pins can be contacted with adjacent pins which do not provide the first voltage due to the extrusion of the screen line, so that the voltage of the detection pins is pulled down, or the screen line as a conductor can conduct the detection pins with the adjacent pins which do not provide the first voltage during oblique insertion, so that the voltage of the detection pins is pulled down, for example, 0V or less than 10mV. Therefore, after the detection pin is connected with the screen wire, the voltage of the detection pin is compared with the reference voltage, if the screen wire is normally spliced with the connecting interface, the voltage of the detection pin is larger than the reference voltage, and the screen opening signal is received, so that power is supplied to the display screen. If the voltage of the detection pin is smaller than the reference voltage, the screen wire is obliquely inserted, and power is not supplied to the display screen. For example, if there are multiple detection pins, a first voltage is provided to each detection pin; after the plurality of detection pins are connected with the screen wire, comparing the voltage of each detection pin with the reference voltage, and if the voltage of each detection pin is all greater than the reference voltage and a screen opening signal is received, supplying power to the display screen; if the voltage of any one of the detection pins is smaller than the reference voltage, the power is not supplied to the display screen.
Therefore, the detection method in the embodiment can protect the display screen from damaging the internal electronic devices caused by oblique insertion of the screen wires, and solves the quality safety problem of the power-on burned components caused by oblique insertion and short circuit of the screen wires in production operation
In the foregoing embodiments, the descriptions of the embodiments are focused on, and the portions of a certain embodiment that are not described in detail may be referred to the detailed description of the protection circuit, which is not repeated herein.
The protection circuit, the display screen and the detection method provided by the embodiment of the application are described in detail, and specific examples are applied to the description of the principle and the implementation mode of the application, and the description of the above embodiments is only used for helping to understand the method and the core idea of the application; meanwhile, as those skilled in the art will vary in the specific embodiments and application scope according to the ideas of the present application, the present description should not be construed as limiting the present application in summary.

Claims (11)

1. A protection circuit for a display device, comprising:
the detection pin is connected with the screen wire;
the micro-electricity supply circuit is connected with the detection pin and can supply a first voltage to the detection pin;
the comparison circuit comprises a first input end, a second input end and an output end, wherein the first input end is connected with the detection pin, the second input end transmits reference voltage, if the voltage of the first input end is larger than the reference voltage, the output end of the comparison circuit outputs a first level, otherwise, the output end of the comparison circuit outputs a second level, and the reference voltage is smaller than the first voltage;
the power supply control circuit is connected with the comparison circuit, and is used for controlling the display screen of the display device to be conducted with a power supply if the output end of the comparison circuit outputs the first level; and if the output end of the comparison circuit outputs the second level, the power supply control circuit is used for controlling the display screen of the display device to be disconnected from the power supply.
2. The protection circuit of claim 1, wherein the power supply control circuit comprises a power input end, a screen power supply end, a screen opening end and a power supply control end, the power input end is used for connecting a power supply, the screen power supply end is used for connecting a power pin of the display screen, the screen opening end is used for receiving a screen opening signal, and the power supply control end is connected with an output end of the comparison circuit;
if the output end of the comparison circuit outputs the first level and the screen opening end receives a screen opening signal, the power supply control circuit controls the power supply input end and the screen power supply end to be conducted;
and if the output end of the comparison circuit outputs the second level, the power supply control circuit controls the power supply input end and the screen power supply end to be disconnected.
3. The protection circuit according to claim 2, wherein the plurality of detection pins are plural, the plural detection pins are respectively connected to the plural comparison circuits, the power supply control circuit includes:
and each input end of the logic circuit is respectively connected with the output end of one comparison circuit, the output end of the logic circuit is connected with the power supply control end, and the logic circuit can output the output end level of the comparison circuits after AND logic operation.
4. The protection circuit according to claim 3, wherein the power supply control circuit further comprises a first switching tube and a control sub-circuit, an input end of the first switching tube is connected with a power supply input end, an output end of the first switching tube is connected with a screen power supply end, and the screen opening end and the output end are connected with a control end of the first switching tube through the control sub-circuit;
if the output end of the logic circuit also outputs the first level and the screen opening end receives a screen opening signal, the control sub-circuit provides a first signal for the control end of the first switching tube so as to conduct the input end and the output end of the first switching tube;
and if the output end of the logic circuit also outputs the second level, the control sub-circuit provides a second signal for the control end of the first switching tube so as to disconnect the input end and the output end of the first switching tube.
5. The protection circuit according to claim 4, wherein the control sub-circuit comprises a second switching tube, a third switching tube and a fourth switching tube, a control end of the second switching tube is connected with the screen opening end, and an output end of the second switching tube is grounded;
the input end of the third switching tube is connected with the output end of the logic circuit, the control end of the third switching tube is connected with the input end of the second switching tube through a first resistor, and the output end of the third switching tube is grounded through a second resistor;
the input end of the fourth switching tube is connected with the control end of the first switching tube, the output end of the fourth switching tube is grounded, and the control end of the fourth switching tube is connected with the output end of the third switching tube.
6. A protection circuit according to claim 3, wherein the protection circuit further comprises:
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 with the output end of the logic circuit, the input end of the indicating switch tube is connected with 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 with the input end of the indicating switch tube, and the other end of the alarm is grounded.
7. The protection circuit according to any one of claims 1 to 6, wherein the micro-electric supply circuit comprises a battery, a current limiting resistor, a first voltage dividing resistor, a second voltage dividing resistor and a voltage stabilizing reference source, wherein the positive electrode of the battery is sequentially connected with the current limiting resistor, the first voltage dividing resistor and the second voltage dividing resistor 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.
8. The protection circuit of claim 7, wherein the micro-electrical supply circuit further comprises a micro-electrical switch disposed between the battery and the current limiting resistor.
9. The protection circuit of claim 1, wherein the detection pin is a power pin and the other pins adjacent to the power pin are low level pins; or the detection pins are adjacently pins.
10. A display device, characterized in that the display device comprises:
a display screen;
a circuit board;
the display screen is connected with the circuit board through the screen wire;
protection circuit according to any one of claims 1-9, which is provided on the display screen or the circuit board.
11. A detection method applied to a display device, the method comprising:
providing a first voltage to the detection pin;
after the detection pin is connected with the screen wire, comparing the voltage of the detection pin with a reference voltage, wherein the reference voltage is smaller than the first voltage signal;
if the voltage of the detection pin is larger than the reference voltage and a screen opening signal is received, supplying power to the display screen;
and if the voltage of the detection pin is smaller than the reference voltage, not supplying power to the display screen.
CN202211486620.1A 2022-11-24 2022-11-24 Protection circuit, display device and detection method Pending CN117116226A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202211486620.1A CN117116226A (en) 2022-11-24 2022-11-24 Protection circuit, display device and detection method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202211486620.1A CN117116226A (en) 2022-11-24 2022-11-24 Protection circuit, display device and detection method

Publications (1)

Publication Number Publication Date
CN117116226A true CN117116226A (en) 2023-11-24

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Family Applications (1)

Application Number Title Priority Date Filing Date
CN202211486620.1A Pending CN117116226A (en) 2022-11-24 2022-11-24 Protection circuit, display device and detection method

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Country Link
CN (1) CN117116226A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN117826032A (en) * 2024-02-23 2024-04-05 深圳市灰度科技有限公司 Method, device, equipment and medium for detecting wiring between main board end and screen end

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN117826032A (en) * 2024-02-23 2024-04-05 深圳市灰度科技有限公司 Method, device, equipment and medium for detecting wiring between main board end and screen end
CN117826032B (en) * 2024-02-23 2024-06-04 深圳市灰度科技有限公司 Method, device, equipment and medium for detecting wiring between main board end and screen end

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