WO2022213416A1 - 驱动电路及显示装置 - Google Patents

驱动电路及显示装置 Download PDF

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Publication number
WO2022213416A1
WO2022213416A1 PCT/CN2021/087829 CN2021087829W WO2022213416A1 WO 2022213416 A1 WO2022213416 A1 WO 2022213416A1 CN 2021087829 W CN2021087829 W CN 2021087829W WO 2022213416 A1 WO2022213416 A1 WO 2022213416A1
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WO
WIPO (PCT)
Prior art keywords
resistor
branch
control module
dip switch
voltage
Prior art date
Application number
PCT/CN2021/087829
Other languages
English (en)
French (fr)
Inventor
李文芳
Original Assignee
Tcl华星光电技术有限公司
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Tcl华星光电技术有限公司 filed Critical Tcl华星光电技术有限公司
Priority to US17/294,800 priority Critical patent/US11908359B2/en
Publication of WO2022213416A1 publication Critical patent/WO2022213416A1/zh

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Classifications

    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/006—Electronic inspection or testing of displays and display drivers, e.g. of LED or LCD displays
    • 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
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L25/00—Assemblies consisting of a plurality of individual semiconductor or other solid state devices ; Multistep manufacturing processes thereof
    • H01L25/16—Assemblies consisting of a plurality of individual semiconductor or other solid state devices ; Multistep manufacturing processes thereof the devices being of types provided for in two or more different main groups of groups H01L27/00 - H01L33/00, or in a single subclass of H10K, H10N, e.g. forming hybrid circuits
    • H01L25/167—Assemblies consisting of a plurality of individual semiconductor or other solid state devices ; Multistep manufacturing processes thereof the devices being of types provided for in two or more different main groups of groups H01L27/00 - H01L33/00, or in a single subclass of H10K, H10N, e.g. forming hybrid circuits comprising optoelectronic devices, e.g. LED, photodiodes

Definitions

  • the present application relates to the field of display, and in particular, to a driving circuit and a display device.
  • LED is composed of multiple light boards. Due to the manufacturing process, the light board will be damaged to a certain extent. When the light board is tested for lighting, it is difficult to find very small damage to the light board. However, as the lighting time increases, the light board is damaged. Abnormalities will appear, resulting in abnormal display, resulting in customer complaints or returns.
  • the embodiment of the present application provides a driving circuit and a display device, which can increase the test voltage of the lighting test, so that the subtle damage of the mini LED lamp board can be exposed in time during the lighting test process, which is conducive to timely removal of defective products and improves the shipment rate. quality, reduce the occurrence of customer complaints or returns.
  • An embodiment of the present application provides a driving circuit, including: a power supply control module and an output control module, an output end of the power supply control module is connected to an input end of the output control module, and the output control module includes a first resistor, a third A second resistor, a third resistor and a switch control unit, the switch control unit is connected in series with the third resistor and then connected in parallel with the second resistor, and then connected in series with the first resistor;
  • the switch control unit When the drive circuit is in the first state, the switch control unit is disconnected, the branch where the third resistor is located is disconnected, the first resistor and the second resistor are connected in series, and the drive circuit outputs a voltage Vout1;
  • the switch control unit When the driving circuit is in the second state, the switch control unit is turned on, the branch where the third resistor is located is turned on, and the third resistor is connected in parallel with the second resistor and then connected to the first resistor connected in series, the drive circuit outputs a voltage Vout2;
  • Vout2 The absolute value of Vout2 is greater than the absolute value of Vout1.
  • the switch control unit is a DIP switch.
  • the switch control unit at least includes a MOS transistor, a DIP switch, and a resistor, the DIP switch and the resistor form a branch in series with each other, and the DIP switch and the resistor form a branch in series with each other.
  • the MOS transistor is connected in series with the third resistor, the gate of the MOS transistor is connected to the branch, and the gate voltage of the MOS transistor is controlled by the conduction of the branch.
  • one end of the branch circuit is connected to the input voltage, the other end of the branch circuit is grounded, and the DIP switch is provided at the voltage access end of the branch circuit and the other end of the branch circuit. between the gates of the MOS transistors.
  • the switch control unit includes a MOS transistor, a DIP switch, and a resistor.
  • the first end of the DIP switch is connected to the input voltage
  • the second end of the DIP switch is connected to the first end of the resistor and the MOS transistor.
  • the gate is connected, and the second end of the resistor is grounded.
  • the switch control unit includes a MOS transistor, a DIP switch, an indicator light, a fourth resistor, a fifth resistor, the DIP switch, the fourth The resistor, the indicator light and the fifth resistor form a branch circuit connected in series with each other.
  • the first end of the fourth resistor is connected to the input voltage
  • the second end of the fourth resistor is connected to the first end of the indicator light
  • the The second end of the indicator light is connected to the first end of the DIP switch
  • the second end of the DIP switch is connected to the first end of the fifth resistor and the gate of the MOS transistor
  • the second end of the DIP switch is connected to the first end of the fifth resistor and the gate of the MOS transistor.
  • the second terminal of the five resistors is grounded.
  • the first end of the fourth resistor is connected to the input voltage
  • the second end of the fourth resistor is connected to the first end of the DIP switch
  • the second end of the dip switch is connected to the first end of the indicator light and the gate of the MOS transistor
  • the second end of the indicator light is connected to the first end of the fifth resistor
  • the first end of the indicator light is connected to the first end of the fifth resistor.
  • the second terminal of the five resistors is grounded.
  • the input end of the power control module is connected to a first external power supply, and is connected to the first end of the first resistor and the output end of the drive circuit, so The output end of the power control module is connected to the second end of the first resistor, the first end of the second resistor, and the first end of the third resistor, and the second end of the second resistor is grounded,
  • the first end of the MOS transistor is connected to the second end of the third resistor, the second end of the MOS transistor is grounded, and the first end of the branch where the DIP switch is located is connected to the second external power supply, so The second end of the branch where the DIP switch is located is grounded.
  • the input end of the power control module is connected to a first external power supply
  • the first output end of the power control module is connected to the first end of the first resistor and grounded
  • the second output end of the power control module is connected to the second end of the first resistor, the first end of the second resistor, and the first end of the third resistor
  • the first end of the MOS transistor One end is connected to the second end of the third resistor
  • the third output end of the power control module is connected to the second end of the second resistor
  • the second end of the MOS transistor where the DIP switch is located
  • the first end of the branch is connected to the output end of the driving circuit, and the second end of the branch where the DIP switch is located is grounded.
  • the drive circuit further includes a voltage stabilization module, one end of the voltage stabilization module is connected to the power control module, and the other end is connected to the first end of the first resistor. connected to ensure the stability of the output voltage of the driving circuit.
  • the voltage regulator module includes at least one of a capacitor or an inductor.
  • an embodiment of the present application further provides a display device, which includes a drive circuit, the drive circuit includes a power supply control module and an output control module, and an output end of the power supply control module is connected to an input end of the output control module , the output control module includes a first resistor, a second resistor, a third resistor and a switch control unit, the switch control unit is connected in series with the third resistor and then connected in parallel with the second resistor, and then connected with the first resistor resistor in series;
  • the switch control unit When the drive circuit is in the first state, the switch control unit is disconnected, the branch where the third resistor is located is disconnected, the first resistor and the second resistor are connected in series, and the drive circuit outputs a voltage Vout1;
  • the switch control unit When the driving circuit is in the second state, the switch control unit is turned on, the branch where the third resistor is located is turned on, and the third resistor is connected in parallel with the second resistor and then connected to the first resistor connected in series, the drive circuit outputs a voltage Vout2;
  • Vout2 The absolute value of Vout2 is greater than the absolute value of Vout1.
  • the switch control unit is a DIP switch.
  • the switch control unit at least includes a MOS transistor, a DIP switch, and a resistor, the DIP switch and the resistor form a branch in series with each other, and the DIP switch and the resistor form a branch in series with each other.
  • the MOS transistor is connected in series with the third resistor, the gate of the MOS transistor is connected to the branch, and the gate voltage of the MOS transistor is controlled by the conduction of the branch.
  • one end of the branch circuit is connected to the input voltage, the other end of the branch circuit is grounded, and the DIP switch is provided at the voltage access end of the branch circuit and the other end of the branch circuit. between the gates of the MOS transistors.
  • the first end of the DIP switch is electrically connected to the voltage access end, and the second end of the DIP switch is electrically connected to the first end of the resistor.
  • the gate of the MOS transistor is electrically connected.
  • the input end of the power control module is connected to a first external power supply, and is connected to the first end of the first resistor and the output end of the drive circuit, so The output end of the power control module is connected to the second end of the first resistor, the first end of the second resistor, and the first end of the third resistor, and the second end of the second resistor is grounded,
  • the first end of the MOS transistor is connected to the second end of the third resistor, the second end of the MOS transistor is grounded, and the first end of the branch where the DIP switch is located is connected to the second external power supply, so The second end of the branch where the DIP switch is located is grounded.
  • the input end of the power control module is connected to a first external power supply
  • the first output end of the power control module is connected to the first end of the first resistor and grounded
  • the second output end of the power control module is connected to the second end of the first resistor, the first end of the second resistor, and the first end of the third resistor
  • the first end of the MOS transistor One end is connected to the second end of the third resistor
  • the third output end of the power control module is connected to the second end of the second resistor
  • the second end of the MOS transistor where the DIP switch is located
  • the first end of the branch is connected to the output end of the driving circuit, and the second end of the branch where the DIP switch is located is grounded.
  • Embodiments of the present application provide a driving circuit and a display device, the driving circuit includes a power control module and an output control module, an output end of the power control module is connected to an input end of the output control module, and the output control module includes a first resistor, a third Two resistors, a third resistor and a switch control unit, the switch control unit is connected in series with the third resistor and then connected in parallel with the second resistor, and then connected in series with the first resistor; when the drive circuit is in the first state, the switch control unit is disconnected, The branch where the third resistor is located is disconnected, the first resistor and the second resistor are connected in series, and the driving circuit outputs the voltage Vout1; when the driving circuit is in the second state, the switch control unit is turned on, and the branch where the third resistor is located is turned on, The third resistor is connected in parallel with the second resistor and then connected in series with the first resistor, and the driving circuit outputs a voltage Vout2; the absolute value of Vout2 is greater
  • the driving circuit when the display panel is in the lighting test state and the driving circuit is in the second state, the driving circuit outputs a lighting test voltage higher than the normal output voltage, thereby improving the lighting test process the test voltage in so that the mini The slight damage of the LED light board can be exposed in time during the lighting test process, which is conducive to timely removal of defective products, improving the quality of shipments, and reducing the occurrence of customer complaints or returns.
  • FIG. 1 is a first circuit diagram of a drive circuit provided by an embodiment of the present application.
  • FIG. 2 is a second circuit diagram of the driving circuit provided by the embodiment of the present application.
  • the embodiments of the present application provide a driving circuit and a display device, so as to increase the test voltage of the lighting test, so that the slight damage of the mini LED lamp board can be exposed in time during the lighting test process, which is conducive to timely removal of defective products and improves the shipment rate. quality, reduce the occurrence of customer complaints or returns.
  • a driving circuit and a display device so as to increase the test voltage of the lighting test, so that the slight damage of the mini LED lamp board can be exposed in time during the lighting test process, which is conducive to timely removal of defective products and improves the shipment rate. quality, reduce the occurrence of customer complaints or returns.
  • the driving circuit provided by the embodiment of the present application includes: a power supply control module 110 and an output control module 120, the output end of the power supply control module 110 is connected to the input end of the output control module 120, and the output control module 120 includes a first resistor R1, the second resistor R2, the third resistor R3 and the switch control unit 121, the switch control unit 121 is connected in series with the third resistor R3 and then connected in parallel with the two resistors R2, and then connected in series with the first resistor R1; In one state, the switch control unit 121 is disconnected, the branch where the third resistor R3 is located is disconnected, the first resistor R1 and the second resistor R2 are connected in series, and the drive circuit outputs the voltage Vout1; when the drive circuit
  • the driving circuit when the display panel is in the lighting test state and the driving circuit is in the second state, the driving circuit outputs a lighting test voltage higher than the normal output voltage, thereby improving the lighting test process the test voltage in so that the mini The slight damage of the LED light board can be exposed in time during the lighting test process, which is conducive to timely removal of defective products, improving the quality of shipments, and reducing the occurrence of customer complaints or returns.
  • the driving circuit includes a power control module 110 , an output control module 120 and a voltage regulator module 130 , the input terminal of the power control module 110 is connected to the first terminal of the voltage regulator module 130 , and the power control The output terminal of the module 110 is connected to the first input terminal of the output control module 120 , the second terminal of the voltage regulator module 130 is connected to the second input terminal of the output control module 120 , and is connected to the output terminal of the driving circuit at point A.
  • the power control module 110 includes a power control chip, and the power control chip is used to control the output voltage of the power control module 110 .
  • the voltage regulator module 130 includes an inductor L1, the first end of the inductor L1 is connected to the input end of the power control module 110 and connected to the external input voltage V0, the second end of the inductor L1 is connected to the second input end of the output control module 120, the driving circuit
  • the output end of the voltage regulator module 130 is connected to the point A, and the voltage regulator module 130 uses the inductor L1 to filter the clutter in the voltage of the output control module 120, so as to ensure the stability of the output voltage of the driving circuit.
  • the output control module 120 is used for controlling the magnitude of the output voltage Vout of the driving circuit.
  • the output control module 120 includes a first resistor R1 , a second resistor R2 , a third resistor R3 and a switch control unit 121 .
  • the first end of the first resistor R1 is connected to point A, that is, connected to the first input end of the output control module 120 and the output end of the driving circuit, the second end of the first resistor R1 and the first end of the second resistor R2 terminal and the first terminal of the third resistor R3 are connected to point B, that is, connected to the first input terminal of the output control module 120 and the input terminal of the power supply control module 110, the second terminal of the second resistor R2 is grounded, and the third resistor R3
  • the second end of the switch control unit 121 is connected to the first end of the switch control unit 121, and the second end of the switch control unit 121 is grounded.
  • the switch control unit 121 includes a MOS transistor Q1, a fourth resistor R4, an indicator light D1, a DIP switch S1, and a fifth resistor R5.
  • the first end of the MOS transistor Q1 is connected to the first end of the switch control unit 121, that is, to the second end of the third resistor R3, the second end of the MOS transistor Q1 is grounded; the first end of the fourth resistor R4 is connected to the ground Input the external voltage V1, the second end of the fourth resistor R4 is connected to the first end of the indicator light D1, the second end of the indicator light D1 is connected to the first end of the DIP switch S1, and the second end of the DIP switch S1 is connected to the The first end of the fifth resistor R5 is connected, the second end of the fifth resistor R5 is grounded, the gate of the MOS transistor Q1 is connected to the second end of the dip switch S1 and the first end of the fifth resistor R5 is connected to point C.
  • the first end of the third resistor R3 is connected to the first end of the second resistor R2, and the second end of the third resistor R3 is grounded through the switch control unit 121.
  • the switch control unit 121 When the switch control unit 121 is turned on, the third resistor R3 is connected to the ground.
  • the voltage of the first end is consistent with the voltage of the first end of the second resistor R2, and the voltage of the second end of the third resistor R3 is consistent with the voltage of the first end of the second resistor R2, which can be regarded as the third resistor R3 and the first end.
  • the two resistors R2 are connected in parallel; when the switch control unit 121 is disconnected, the branch where the third resistor R3 is located is disconnected.
  • R1 and R2 are both fixed-value resistors, R1 and R2 are divided in series to determine the output voltage of the drive circuit, and the switch control unit 121 controls the conduction state of the branch where the third resistor R3 is located, thereby controlling the third resistor.
  • the parallel state of R3 and the second resistor R2 can adjust the voltage division across the second resistor R2, thereby adjusting the voltage division across the first resistor R1, thereby adjusting the output voltage Vout of the driving circuit.
  • the conduction state of the switch control unit 121 is determined by the conduction state of the MOS transistor Q1, and the gate voltage of the MOS transistor Q1 is a branch formed by the fourth resistor R4, the indicator light D1, the DIP switch S1 and the fifth resistor R5 in series. control.
  • the MOS transistor Q1 is an N-type transistor. When the gate of the MOS transistor Q1 is at a high potential, the MOS transistor Q1 is turned on, and when the gate of the MOS transistor Q1 is at a low potential, the MOS transistor Q1 is turned off.
  • the DIP switch S1 When the DIP switch S1 is closed, the branch formed by the fourth resistor R4, the indicator light D1, the DIP switch S1 and the fifth resistor R5 in series with each other is turned on, and the external voltage V1 is input to the branch, and the external voltage V1 is a high potential
  • the voltage for example, can be selected as 5V, and the second end of the fifth resistor R5 is grounded, then the first end of the fifth resistor R5 is at a high potential, that is, the point C is at a high potential, and the gate of the MOS transistor Q1 is connected to the point C.
  • the MOS transistor Q1 is turned on, the branch where the third resistor R3 is located is turned on, and the third resistor R3 is connected in parallel with the second resistor R2; at the same time, the indicator light D1 is lit, indicating that the switch control unit 121 is in a conducting state, It further indicates the output voltage state of the driving circuit corresponding to this state.
  • the DIP switch S1 when the DIP switch S1 is disconnected, the branch formed by the fourth resistor R4, the indicator light D1, the DIP switch S1 and the fifth resistor R5 in series with each other is disconnected, and the second end of the fifth resistor R5 is grounded, then The first end of the fifth resistor R5 is the ground potential, that is, the point C is at the ground potential, the gate of the MOS transistor Q1 is connected to the point C, and is also at the ground potential, the MOS transistor Q1 is off, and the branch where the third resistor R3 is located is off.
  • the indicator light D1 does not light up, indicating that the switch control unit 121 is in an off state, and further indicates the output voltage state of the drive circuit corresponding to this state.
  • the MOS transistor Q1 may also be a P-type transistor.
  • the first end of the fourth resistor R4 is grounded, and the second end of the fifth resistor R5 is connected to an external low-potential voltage.
  • any one or two of the fourth resistor R4 and the indicator light D1 can also be selectively removed, and the normal operation of the entire switch control unit 121 is not affected.
  • the switch control unit 121 can also be directly replaced by a DIP switch, the first end of the DIP switch is connected to the second end of the third resistor, and the second end is grounded.
  • the DIP switch is closed, the branch where the third resistor R3 is located is turned on, and the third resistor R3 is connected in parallel with the second resistor R2; when the DIP switch is disconnected, the branch where the third resistor R3 is located is disconnected.
  • the output voltage Vout1 of the drive circuit is:
  • Vout1 VB(1+R1/R2)
  • VB is the voltage of the first end of the second resistor R2
  • R1 is the resistance value of the first resistor R1
  • R2 is the resistance value of the second resistor R2.
  • VB is usually a fixed voltage value, such as 0.6V.
  • the switch control unit 121 When the driving circuit is in the second state, the switch control unit 121 is turned on, the branch where the third resistor R3 is located is turned on, the second resistor R2 and the third resistor R3 are connected in parallel and then connected in series with the first resistor R1.
  • the output voltage Vout2 of the drive circuit is:
  • Vout2 VB(1+R1 ⁇ (R2+R3)/(R2 ⁇ R3))
  • VB is the voltage of the first terminal of the second resistor R2
  • R1 is the resistance value of the first resistor R1
  • R2 is the resistance value of the second resistor R2
  • R3 is the resistance value of the third resistor R3.
  • VB is usually a fixed voltage value, such as 0.6V.
  • the third resistor R3 may be a fixed-value resistor or a sliding resistor.
  • the output voltage Vout2 of the driving circuit in the second state can be fixedly adjusted; when the third resistor R3 is a sliding resistor, the second state can be adjusted within a certain range according to specific needs is the output voltage Vout2 of the driving circuit.
  • the driving circuit When the driving circuit is in the first state, the display panel is in a normal state, and the output voltage Vout1 of the driving circuit is a normal output voltage at this time.
  • the driving circuit When the driving circuit is in the second state, the display panel is in the lighting test state.
  • the output voltage Vout2 of the driving circuit is the lighting test voltage, and the lighting test voltage is higher than the normal output voltage, that is, the driving circuit provided by the embodiment of the present application improves the lighting
  • the test voltage during the test makes the mini The slight damage of the LED light board can be exposed in time during the lighting test process, which is conducive to timely removal of defective products, improving the quality of shipments, and reducing the occurrence of customer complaints or returns.
  • the driving circuit includes a power control module 110 , an output control module 120 and a voltage regulator module 130 .
  • the input end of the power control module 110 is connected to the external input voltage V0 , and the The first output terminal is connected to the first terminal of the voltage regulator module 130 , the second output terminal of the power supply control module 110 is connected to the first input terminal of the output control module 120 , and the third output terminal of the power supply control module 110 is connected to the output control module 120
  • the second input terminal of 130 is connected to the output terminal of the driving circuit at point E, and the second terminal of the voltage regulator module 130 is connected to the output control module 120 at point A and is grounded.
  • the power control module 110 includes a power control chip, which is used to control the output voltage of the power control module 110 , and specifically convert the positive external input voltage V0 into a negative voltage and output it to the output control module 120 .
  • the voltage regulator module 130 includes a capacitor C1 and an inductor L1, the first end of the capacitor C1 is connected to the first output end of the power control module 110, the second end of the capacitor C1 is connected to the first end of the inductor L1, and the second end of the inductor L1 Connected to the output control module 120 at point A and grounded, the voltage regulator module 130 uses the capacitor C1 and the inductor L1 to filter the clutter in the voltage of the output control module 120 to ensure the stability of the output voltage of the driving circuit.
  • the output control module 120 is used for controlling the magnitude of the output voltage Vout of the driving circuit.
  • the output control module 120 includes a first resistor R1 , a second resistor R2 , a third resistor R3 and a switch control unit 121 .
  • the first end of the first resistor R1 is connected to point A, that is, the first end of the first resistor R1 is grounded, the second end of the first resistor R1, the first end of the second resistor R2 and the third end of the third resistor R3
  • point B that is, connected to the first input end of the output control module 120 and the first output end of the power control module 110
  • the second end of the third resistor R3 is connected to the first end of the switch control unit 121
  • the second end of the two resistors R2 and the second end of the switch control unit 121 are connected to the point E, that is, to the third output end of the power control module 110, the second input end of the output control module 120 and the output end of the drive circuit,
  • the switch control unit 121 includes a MOS transistor Q1, a fourth resistor R4, an indicator light D1, a DIP switch S1, and a fifth resistor R5.
  • the first end of the MOS transistor Q1 is connected to the first end of the switch control unit 121, that is, to the second end of the third resistor R3, and the second end of the MOS transistor Q1 is connected to the point E, that is, to the switch control unit 121.
  • the second end of the fourth resistor R4 is connected to the second end of the second resistor R2; the first end of the fourth resistor R4 is grounded, the second end of the fourth resistor R4 is connected to the first end of the indicator light D1, and the second end of the indicator light D1 It is connected to the first end of the DIP switch S1, the second end of the DIP switch S1 is connected to the first end of the fifth resistor R5, and the second end of the fifth resistor R5 is connected to the point E, that is, to the switch control unit 121.
  • the second end is connected, the gate of the MOS transistor Q1 is connected to the second end of the indicator light D1 and the first end of the DIP switch S1 is connected to the point C.
  • the first end of the third resistor R3 is connected to the first end of the second resistor R2, and the second end of the third resistor R3 is connected to the second end of the second resistor R2 through the switch control unit 121.
  • the switch control unit 121 When turned on, the voltage of the first end of the third resistor R3 is consistent with the voltage of the first end of the second resistor R2, the voltage of the second end of the third resistor R3 is consistent with the voltage of the first end of the second resistor R2, It can be considered that the third resistor R3 is connected in parallel with the second resistor R2; when the switch control unit 121 is disconnected, the branch where the third resistor R3 is located is an open circuit.
  • R1 and R2 are both fixed-value resistors, R1 and R2 are divided in series to determine the output voltage of the drive circuit, and the switch control unit 121 controls the conduction state of the branch where the third resistor R3 is located, thereby controlling the third resistor.
  • the parallel state of R3 and the second resistor R2 can adjust the voltage division across the second resistor R2, thereby adjusting the voltage division across the first resistor R1, thereby adjusting the output voltage Vout of the driving circuit.
  • the conduction state of the switch control unit 121 is determined by the conduction state of the MOS transistor Q1, and the gate voltage of the MOS transistor Q1 is a branch formed by the fourth resistor R4, the indicator light D1, the DIP switch S1 and the fifth resistor R5 in series. control.
  • the MOS transistor Q1 is a P-type transistor. When the gate of the MOS transistor Q1 is at a low potential, the MOS transistor Q1 is turned on, and when the gate of the MOS transistor Q1 is at a high potential, the MOS transistor Q1 is turned off.
  • the first end of the fourth resistor R4 is grounded, then the second end of the fourth resistor R4 is at a negative low potential, then the point C is at a negative low potential, and the gate of the MOS transistor Q1 is connected At point C, which is also at a negative low potential, the MOS transistor Q1 is turned on, the branch where the third resistor R3 is located is turned on, and the third resistor R3 is connected in parallel with the second resistor R2; at the same time, the indicator light D1 lights up, indicating the switch
  • the control unit 121 is in an on state, and further indicates the output voltage state of the driving circuit corresponding to this state.
  • the DIP switch S1 when the DIP switch S1 is disconnected, the branch formed by the fourth resistor R4, the indicator light D1, the DIP switch S1 and the fifth resistor R5 in series with each other is disconnected, and the first end of the fourth resistor R4 is grounded, then The first end of the fourth resistor R4 is the ground potential, that is, the point C is at the ground potential, the gate of the MOS transistor Q1 is connected to the point C, and is also at the ground potential, the MOS transistor Q1 is off, and the branch where the third resistor R3 is located is off.
  • the indicator light D1 does not light up, indicating that the switch control unit 121 is in an off state, and further indicates the output voltage state of the drive circuit corresponding to this state.
  • any one or two of the fifth resistor R5 and the indicator light D1 can also be selectively removed, and the normal operation of the entire switch control unit 121 is not affected.
  • the switch control unit 121 can also be directly replaced by a DIP switch, the first end of the DIP switch is connected to the second end of the third resistor, and the second end is grounded.
  • the DIP switch is closed, the branch where the third resistor R3 is located is turned on, and the third resistor R3 is connected in parallel with the second resistor R2; when the DIP switch is disconnected, the branch where the third resistor R3 is located is disconnected.
  • the output voltage Vout1 of the drive circuit is:
  • Vout1 VB(1+R1/R2)
  • VB is the voltage of the first end of the second resistor R2
  • R1 is the resistance value of the first resistor R1
  • R2 is the resistance value of the second resistor R2.
  • VB is usually a fixed voltage value, such as -0.6V.
  • the switch control unit 121 When the driving circuit is in the second state, the switch control unit 121 is turned on, the branch where the third resistor R3 is located is turned on, the second resistor R2 and the third resistor R3 are connected in parallel and then connected in series with the first resistor R1.
  • the output voltage Vout2 of the drive circuit is:
  • Vout2 VB(1+R1 ⁇ (R2+R3)/(R2 ⁇ R3))
  • VB is the voltage of the first terminal of the second resistor R2
  • R1 is the resistance value of the first resistor R1
  • R2 is the resistance value of the second resistor R2
  • R3 is the resistance value of the third resistor R3.
  • VB is usually a fixed voltage value, such as -0.6V.
  • the third resistor R3 may be a fixed-value resistor or a sliding resistor.
  • the output voltage Vout2 of the driving circuit in the second state can be fixedly adjusted; when the third resistor R3 is a sliding resistor, the second state can be adjusted within a certain range according to specific needs is the output voltage Vout2 of the driving circuit.
  • the driving circuit When the driving circuit is in the first state, the display panel is in a normal state, and the output voltage Vout1 of the driving circuit is a normal output voltage at this time.
  • the driving circuit When the driving circuit is in the second state, the display panel is in the lighting test state.
  • the output voltage Vout2 of the driving circuit is the lighting test voltage, and the lighting test voltage is higher than the normal output voltage, that is, the driving circuit provided by the embodiment of the present application improves the lighting
  • the test voltage during the test makes the mini The slight damage of the LED light board can be exposed in time during the lighting test process, which is conducive to timely removal of defective products, improving the quality of shipments, and reducing the occurrence of customer complaints or returns.
  • the embodiments of the present application also provide a display device, the display device includes any of the driving circuits provided in the embodiments of the present application, and has the technical features and technical effects of any of the driving circuits provided in the embodiments of the present application.
  • the display device includes any of the driving circuits provided in the embodiments of the present application, and has the technical features and technical effects of any of the driving circuits provided in the embodiments of the present application.
  • the embodiments of the present application provide a driving circuit and a display device, the driving circuit includes: a power control module and an output control module, an output end of the power control module is connected to an input end of the output control module, and the output control module includes A first resistor, a second resistor, a third resistor and a switch control unit, the switch control unit is connected in series with the third resistor and then connected in parallel with the two resistors, and then connected in series with the first resistor; when the drive circuit is in the first state, the switch The control unit is disconnected, the branch where the third resistor is located is disconnected, the first resistor and the second resistor are connected in series, and the drive circuit outputs the voltage Vout1; when the drive circuit is in the second state, the switch control unit is turned on, and the third resistor is connected to the circuit.
  • the branch is turned on, the third resistor is connected in parallel with the second resistor and then connected in series with the first resistor, and the drive circuit outputs a voltage Vout2; the absolute value of Vout2 is greater than the absolute value of Vout1.

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Abstract

一种驱动电路及显示装置，驱动电路的输出控制模块（120）包括第一电阻（R1）、第二电阻（R2）、第三电阻（R3）和开关控制单元（121），开关控制单元（121）与第三电阻（R3）串联后与二电阻（R2）并联，然后再与第一电阻（R1）串联；第一状态时，开关控制单元（121）断开，驱动电路输出电压Vout1；第二状态时，开关控制单元（121）导通，驱动电路输出电压Vout2；Vout2的绝对值大于Vout1的绝对值。

Description

驱动电路及显示装置 技术领域
本申请涉及显示领域，具体涉及一种驱动电路及显示装置。
 背景技术
随着人们对于显示装置显示效果的要求越来越高，mini LED已经成为现在高阶显示装置的应用趋势，mini LED是由多个灯板组成的，由于制程原因灯板会存在一定的损伤，在对灯板进行点灯测试时，灯板很细小的损伤不易被发现，但是随着点灯时间加长，灯板的异常就会出现，造成显示异常，从而引起客诉或退货。
 技术问题
本申请实施例提供一种驱动电路及显示装置，可以提高点灯测试的测试电压，使得mini LED灯板的细微损伤能够在点灯测试过程中及时暴露出来，有利于及时剔除残次品，提高出货品质，降低客诉或退货现象的发生。
 技术解决方案
本申请实施例提供一种驱动电路，包括：电源控制模块和输出控制模块，所述电源控制模块的输出端与所述输出控制模块的输入端连接，所述输出控制模块包括第一电阻、第二电阻、第三电阻和开关控制单元，所述开关控制单元与所述第三电阻串联后与所述二电阻并联，然后再与所述第一电阻串联；
当所述驱动电路处于第一状态时，所述开关控制单元断开，所述第三电阻所在的支路断接，所述第一电阻和所述第二电阻串联，所述驱动电路输出电压Vout1；
当所述驱动电路处于第二状态时，所述开关控制单元导通，所述第三电阻所在的支路导通，所述第三电阻与所述第二电阻并联后与所述第一电阻串联，所述驱动电路输出电压Vout2；
所述Vout2的绝对值大于所述Vout1的绝对值。
可选的，在本申请的一些实施例中，所述开关控制单元为拨码开关。
可选的，在本申请的一些实施例中，所述开关控制单元至少包括一个MOS晶体管、一个拨码开关和一个电阻，所述拨码开关和所述电阻形成相互串联的支路，所述MOS晶体管与所述第三电阻串联，所述MOS晶体管的栅极与所述支路连接，通过所述支路的导通控制所述MOS晶体管的栅极电压。
可选的，在本申请的一些实施例中，所述支路的一端接输入电压，所述支路的另一端接地，所述拨码开关设于所述支路的电压接入端和所述MOS晶体管的栅极之间。
可选的，在本申请的一些实施例中，所述开关控制单元包括一个MOS晶体管、一个拨码开关和一个电阻。
可选的，在本申请的一些实施例中，所述拨码开关的第一端接所述输入电压，所述拨码开关的第二端与所述电阻的第一端、所述MOS晶体管的栅极连接，所述电阻的第二端接地。
可选的，在本申请的一些实施例中，所述开关控制单元包括一个MOS晶体管、一个拨码开关、一个指示灯和第四电阻、第五电阻，所述拨码开关、所述第四电阻、所述指示灯和所述第五电阻形成相互串联的支路。
可选的，在本申请的一些实施例中，所述第四电阻的第一端接所述输入电压，所述第四电阻的第二端与所述指示灯的第一端连接，所述指示灯的第二端与所述拨码开关的第一端连接，所述拨码开关的第二端与所述第五电阻的第一端、所述MOS晶体管的栅极连接，所述第五电阻的第二端接地。
可选的，在本申请的一些实施例中，所述第四电阻的第一端接所述输入电压，所述第四电阻的第二端与所述拨码开关的第一端连接，所述拨码开关的第二端与所述指示灯的第一端、所述MOS晶体管的栅极连接，所述指示灯的第二端与所述第五电阻的第一端连接，所述第五电阻的第二端接地。
可选的，在本申请的一些实施例中，所述电源控制模块的输入端接入第一外接电源，且与所述第一电阻的第一端、所述驱动电路的输出端连接，所述电源控制模块的输出端与所述第一电阻的第二端、所述第二电阻的第一端、所述第三电阻的第一端连接，所述第二电阻的第二端接地，所述MOS晶体管的第一端与所述第三电阻的第二端连接，所述MOS晶体管的第二端接地，所述拨码开关所在支路的第一端接入第二外接电源，所述拨码开关所在支路的第二端接地。
可选的，在本申请的一些实施例中，所述电源控制模块的输入端接入第一外接电源，所述电源控制模块的第一输出端与所述第一电阻的第一端连接且接地，所述电源控制模块的第二输出端与所述第一电阻的第二端、所述第二电阻的第一端、所述第三电阻的第一端连接，所述MOS晶体管的第一端与所述第三电阻的第二端连接，所述电源控制模块的第三输出端与所述第二电阻的第二端、所述MOS晶体管的第二端、所述拨码开关所在支路的第一端、以及所述驱动电路的输出端连接，所述拨码开关所在支路的第二端接地。
可选的，在本申请的一些实施例中，所述驱动电路还包括稳压模块，所述稳压模块的一端与所述电源控制模块连接，另一端与所述第一电阻的第一端连接，用于保证所述驱动电路输出电压的稳定性。
可选的，在本申请的一些实施例中，所述稳压模块至少包括电容或电感中的一种。
相应的，本申请实施例还提供一种显示装置，其包括驱动电路，所述驱动电路包括电源控制模块和输出控制模块，所述电源控制模块的输出端与所述输出控制模块的输入端连接，所述输出控制模块包括第一电阻、第二电阻、第三电阻和开关控制单元，所述开关控制单元与所述第三电阻串联后与所述二电阻并联，然后再与所述第一电阻串联；
当所述驱动电路处于第一状态时，所述开关控制单元断开，所述第三电阻所在的支路断接，所述第一电阻和所述第二电阻串联，所述驱动电路输出电压Vout1；
当所述驱动电路处于第二状态时，所述开关控制单元导通，所述第三电阻所在的支路导通，所述第三电阻与所述第二电阻并联后与所述第一电阻串联，所述驱动电路输出电压Vout2；
所述Vout2的绝对值大于所述Vout1的绝对值。
可选的，在本申请的一些实施例中，所述开关控制单元为拨码开关。
可选的，在本申请的一些实施例中，所述开关控制单元至少包括一个MOS晶体管、一个拨码开关和一个电阻，所述拨码开关和所述电阻形成相互串联的支路，所述MOS晶体管与所述第三电阻串联，所述MOS晶体管的栅极与所述支路连接，通过所述支路的导通控制所述MOS晶体管的栅极电压。
可选的，在本申请的一些实施例中，所述支路的一端接输入电压，所述支路的另一端接地，所述拨码开关设于所述支路的电压接入端和所述MOS晶体管的栅极之间。
可选的，在本申请的一些实施例中，所述拨码开关的第一端与所述电压接入端电性连接，所述拨码开关的第二端与所述电阻的第一端、所述MOS晶体管的栅极电性连接。
可选的，在本申请的一些实施例中，所述电源控制模块的输入端接入第一外接电源，且与所述第一电阻的第一端、所述驱动电路的输出端连接，所述电源控制模块的输出端与所述第一电阻的第二端、所述第二电阻的第一端、所述第三电阻的第一端连接，所述第二电阻的第二端接地，所述MOS晶体管的第一端与所述第三电阻的第二端连接，所述MOS晶体管的第二端接地，所述拨码开关所在支路的第一端接入第二外接电源，所述拨码开关所在支路的第二端接地。
可选的，在本申请的一些实施例中，所述电源控制模块的输入端接入第一外接电源，所述电源控制模块的第一输出端与所述第一电阻的第一端连接且接地，所述电源控制模块的第二输出端与所述第一电阻的第二端、所述第二电阻的第一端、所述第三电阻的第一端连接，所述MOS晶体管的第一端与所述第三电阻的第二端连接，所述电源控制模块的第三输出端与所述第二电阻的第二端、所述MOS晶体管的第二端、所述拨码开关所在支路的第一端、以及所述驱动电路的输出端连接，所述拨码开关所在支路的第二端接地。
 有益效果
本申请实施例提供一种驱动电路及显示装置，所述驱动电路包括电源控制模块和输出控制模块，电源控制模块的输出端与输出控制模块的输入端连接，输出控制模块包括第一电阻、第二电阻、第三电阻和开关控制单元，开关控制单元与第三电阻串联后与所述二电阻并联，然后再与第一电阻串联；当驱动电路处于第一状态时，开关控制单元断开，第三电阻所在的支路断接，第一电阻和第二电阻串联，驱动电路输出电压Vout1；当驱动电路处于第二状态时，开关控制单元导通，第三电阻所在的支路导通，第三电阻与第二电阻并联后与第一电阻串联，驱动电路输出电压Vout2；Vout2的绝对值大于Vout1的绝对值。本申请实施例通过在驱动电路中设置开关控制单元，在显示面板处于点灯测试状态时，驱动电路处于第二状态时，驱动电路输出比正常输出电压更高的点灯测试电压，提高了点灯测试过程中的测试电压，使得mini LED灯板的细微损伤能够在点灯测试过程中及时暴露出来，有利于及时剔除残次品，提高出货品质，降低客诉或退货现象的发生。
 附图说明
下面结合附图，通过对本申请的具体实施方式详细描述，将使本申请的技术方案及其它有益效果显而易见。
图1是本申请实施例提供的驱动电路的第一种电路图；
图2是本申请实施例提供的驱动电路的第二种电路图。
 本发明的实施方式
本申请实施例提供一种驱动电路及显示装置，以提高点灯测试的测试电压，使得mini LED灯板的细微损伤能够在点灯测试过程中及时暴露出来，有利于及时剔除残次品，提高出货品质，降低客诉或退货现象的发生。以下分别进行详细说明。需说明的是，以下实施例的描述顺序不作为对实施例优选顺序的限定。
在一种实施例中，请参照图1和图2所示，1示出了本申请实施例提供的驱动电路的第一种电路图；图2示出了本申请实施例提供的驱动电路的第二种电路图。如图所示，本申请实施例提供的驱动电路包括：电源控制模块110和输出控制模块120，电源控制模块110的输出端与输出控制模块120的输入端连接，输出控制模块120包括第一电阻R1、第二电阻R2、第三电阻R3和开关控制单元121，开关控制单元121与第三电阻R3串联后与所述二电阻R2并联，然后再与第一电阻R1串联；当驱动电路处于第一状态时，开关控制单元121断开，第三电阻R3所在的支路断接，第一电阻R1和第二电阻R2串联，驱动电路输出电压Vout1；当驱动电路处于第二状态时，开关控制单元121导通，第三电阻R3所在的支路导通，第三电阻R3与第二电阻R2并联后与第一电阻R1串联，驱动电路输出电压Vout2；Vout2的绝对值大于Vout1的绝对值。
本申请实施例通过在驱动电路中设置开关控制单元，在显示面板处于点灯测试状态时，驱动电路处于第二状态时，驱动电路输出比正常输出电压更高的点灯测试电压，提高了点灯测试过程中的测试电压，使得mini LED灯板的细微损伤能够在点灯测试过程中及时暴露出来，有利于及时剔除残次品，提高出货品质，降低客诉或退货现象的发生。
在一种实施例中，请参照图1，驱动电路包括电源控制模块110、输出控制模块120和稳压模块130，电源控制模块110的输入端与稳压模块130的第一端连接，电源控制模块110的输出端与输出控制模块120的第一输入端连接，稳压模块130的第二端与输出控制模块120的第二输入端连接，且与驱动电路的输出端连接于点A。
其中，电源控制模块110包括电源控制芯片，电源控制芯片用于控制电源控制模块110的输出电压。
稳压模块130包括电感L1，电感L1的第一端与电源控制模块110的输入端连接，接入外部输入电压V0，电感L1的第二端与输出控制模块120的第二输入端、驱动电路的输出端连接于点A，稳压模块130采用电感L1过滤输出控制模块120的电压中的杂波，从而保证驱动电路输出电压的稳定性。
输出控制模块120用于控制驱动电路输出电压Vout的大小，输出控制模块120包括第一电阻R1、第二电阻R2、第三电阻R3和开关控制单元121。其中，第一电阻R1的第一端连接于点A，即与输出控制模块120的第一输入端、驱动电路的输出端连接，第一电阻R1的第二端、第二电阻R2的第一端和第三电阻R3的第一端连接于点B，即与输出控制模块120的第一输入端、电源控制模块110的输入端连接，第二电阻R2的第二端接地，第三电阻R3的第二端与开关控制单元121的第一端连接，开关控制单元121的第二端接地。
进一步，开关控制单元121包括MOS晶体管Q1、第四电阻R4、指示灯D1、拨码开关S1、以及第五电阻R5。其中，MOS晶体管Q1的第一端与开关控制单元121的第一端连接，即与第三电阻R3的第二端连接，MOS晶体管Q1的第二端接地；第四电阻R4的第一端接入外部电压V1，第四电阻R4的第二端与指示灯D1的第一端连接，指示灯D1的第二端与拨码开关S1的第一端连接，拨码开关S1的第二端与第五电阻R5的第一端连接，第五电阻R5的第二端接地，MOS晶体管Q1的栅极与拨码开关S1的第二端、第五电阻R5的第一端连接于点C。
其中，第三电阻R3的第一端与第二电阻R2的第一端连接，第三电阻R3的第二端通过开关控制单元121接地，当开关控制单元121导通时，第三电阻R3的第一端的电压与第二电阻R2的第一端电压保持一致，第三电阻R3的第二端的电压与第二电阻R2的第一端的电压保持一致，可视为第三电阻R3与第二电阻R2并联；当开关控制单元121断开时，第三电阻R3所在的支路为断路。
又由于R1和R2均为定值电阻，R1和R2通过串联分压以决定驱动电路输出电压的大小，通过开关控制单元121控制第三电阻R3所在支路的导通状态，从而控制第三电阻R3与第二电阻R2的并联状态，可以调节第二电阻R2两端的分压大小，从而调节第一电阻R1两端的分压大小，进而调节驱动电路的输出电压Vout的大小。
开关控制单元121的导通状态由MOS晶体管Q1的导通状态决定，MOS晶体管Q1的栅极电压由第四电阻R4、指示灯D1、拨码开关S1和第五电阻R5相互串联形成的支路控制。在本实施例中，MOS晶体管Q1为N型晶体管，当MOS晶体管Q1的栅极处于高电位时，MOS晶体管Q1导通，当MOS晶体管Q1的栅极处于低电位时，MOS晶体管Q1断开。
当拨码开关S1闭合时，第四电阻R4、指示灯D1、拨码开关S1和第五电阻R5相互串联形成的支路导通，外部电压V1输入该支路，该外部电压V1为高电位电压，例如可选为5V，第五电阻R5的第二端接地，则第五电阻R5的第一端处于高电位，即点C处于高电位，MOS晶体管Q1的栅极连接于点C，同样处于高电位，MOS晶体管Q1导通，第三电阻R3所在的支路导通，第三电阻R3与第二电阻R2并联；同时，指示灯D1点亮，指示开关控制单元121处于导通状态，进而指示该状态对应的驱动电路的输出电压状态。
相反的，当拨码开关S1断开时，第四电阻R4、指示灯D1、拨码开关S1和第五电阻R5相互串联形成的支路断开，第五电阻R5的第二端接地，则第五电阻R5的第一端为接地电位，即点C处于地电位，MOS晶体管Q1的栅极连接于点C，同样处于地电位，MOS晶体管Q1断开，第三电阻R3所在的支路断接；同时，指示灯D1不点亮，指示开关控制单元121处于断开状态，进而指示该状态对应的驱动电路的输出电压状态。
在本实施例中，MOS晶体管Q1也可以为P型晶体管，相对应的，第四电阻R4的第一端接地，第五电阻R5的第二端接入外部低电位电压。
在本实施例中，第四电阻R4、指示灯D1也可以选择性的去除其中任意一个或两个，且不影响整个开关控制单元121的正常运行。
在本实施例中，开关控制单元121也可以直接采用拨码开关替代，该拨码开关的第一端与第三电阻的第二端连接，第二端接地。当拨码开关闭合时，第三电阻R3所在的支路导通，第三电阻R3与第二电阻R2并联；当拨码开关断开时，第三电阻R3所在的支路断接。
当驱动电路处于第一状态时，开关控制单元121断开，第三电阻R3所在的支路断接，第一电阻R1和第二电阻R2串联。驱动电路的输出电压Vout1为：
Vout1=VB(1+R1/R2)
其中，VB为第二电阻R2的第一端的电压，R1为第一电阻R1的电阻值，R2为第二电阻R2的电阻值。VB通常为一固定电压值，如0.6V。
当驱动电路处于第二状态时，开关控制单元121导通，第三电阻R3所在的支路导通，第二电阻R2和第三电阻R3并联后与第一电阻R1串联。驱动电路的输出电压Vout2为：
Vout2=VB(1+R1×(R2+R3)/(R2×R3))
其中，VB为第二电阻R2的第一端的电压，R1为第一电阻R1的电阻值，R2为第二电阻R2的电阻值，R3为第三电阻R3的电阻值。VB通常为一固定电压值，如0.6V。
由上述公式可知，驱动电路在第二状态下的输出电压Vout2比在第一状态下的输出电压Vout1大。在本申请实施例中，第三电阻R3可以是定值电阻，也可以是滑动电阻器。当第三电阻R3为定值电阻时，可以固定调节第二状态时驱动电路的输出电压Vout2；当第三电阻R3为滑动电阻器时，可以根据具体的需要，在一定范围内调节第二状态时驱动电路的输出电压Vout2。
当驱动电路处于第一状态时，显示面板处于一般状态，此时驱动电路的输出电压Vout1为正常输出电压。当驱动电路处于第二状态时，显示面板处于点灯测试状态，此时驱动电路的输出电压Vout2为点灯测试电压，点灯测试电压比正常输出电压高，即本申请实施例提供的驱动电路提高了点灯测试过程中的测试电压，使得mini LED灯板的细微损伤能够在点灯测试过程中及时暴露出来，有利于及时剔除残次品，提高出货品质，降低客诉或退货现象的发生。
在另一种实施例中，请参照图2，驱动电路包括电源控制模块110、输出控制模块120和稳压模块130，电源控制模块110的输入端接入外部输入电压V0，电源控制模块110的第一输出端与稳压模块130的第一端连接，电源控制模块110的第二输出端与输出控制模块120的第一输入端连接，电源控制模块110的第三输出端与输出控制模块120的第二输入端连接，且与驱动电路的输出端连接于点E，稳压模块130的第二端与输出控制模块120连接于点A且接地。
其中，电源控制模块110包括电源控制芯片，电源控制芯片用于控制电源控制模块110的输出电压，具体的将正向的外部输入电压V0转换为负向电压输出至输出控制模块120。
稳压模块130包括电容C1和电感L1，电容C1的第一端与电源控制模块110的第一输出端连接，电容C1的第二端与电感L1的第一端连接，电感L1的第二端与输出控制模块120连接于点A且接地，稳压模块130采用电容C1和电感L1共同过滤输出控制模块120的电压中的杂波，从而保证驱动电路输出电压的稳定性。
输出控制模块120用于控制驱动电路输出电压Vout的大小，输出控制模块120包括第一电阻R1、第二电阻R2、第三电阻R3和开关控制单元121。其中，第一电阻R1的第一端连接于点A，即第一电阻R1的第一端接地，第一电阻R1的第二端、第二电阻R2的第一端和第三电阻R3的第一端连接于点B，即与输出控制模块120的第一输入端、电源控制模块110的第一输出端连接，第三电阻R3的第二端与开关控制单元121的第一端连接，第二电阻R2的第二端、开关控制单元121的第二端连接于点E，即与电源控制模块110的第三输出端、输出控制模块120的第二输入端和驱动电路的输出端连接，开关控制单元121的第三端接地。
进一步，开关控制单元121包括MOS晶体管Q1、第四电阻R4、指示灯D1、拨码开关S1、以及第五电阻R5。其中，MOS晶体管Q1的第一端与开关控制单元121的第一端连接，即与第三电阻R3的第二端连接，MOS晶体管Q1的第二端连接于点E，即与开关控制单元121的第二端、第二电阻R2的第二端连接；第四电阻R4的第一端接地，第四电阻R4的第二端与指示灯D1的第一端连接，指示灯D1的第二端与拨码开关S1的第一端连接，拨码开关S1的第二端与第五电阻R5的第一端连接，第五电阻R5的第二端连接于点E，即与开关控制单元121的第二端连接，MOS晶体管Q1的栅极与指示灯D1的第二端、拨码开关S1的第一端连接于点C。
其中，第三电阻R3的第一端与第二电阻R2的第一端连接，第三电阻R3的第二端通过开关控制单元121与第二电阻R2的第二端连接，当开关控制单元121导通时，第三电阻R3的第一端的电压与第二电阻R2的第一端电压保持一致，第三电阻R3的第二端的电压与第二电阻R2的第一端的电压保持一致，可视为第三电阻R3与第二电阻R2并联；当开关控制单元121断开时，第三电阻R3所在的支路为断路。
又由于R1和R2均为定值电阻，R1和R2通过串联分压以决定驱动电路输出电压的大小，通过开关控制单元121控制第三电阻R3所在支路的导通状态，从而控制第三电阻R3与第二电阻R2的并联状态，可以调节第二电阻R2两端的分压大小，从而调节第一电阻R1两端的分压大小，进而调节驱动电路的输出电压Vout的大小。
开关控制单元121的导通状态由MOS晶体管Q1的导通状态决定，MOS晶体管Q1的栅极电压由第四电阻R4、指示灯D1、拨码开关S1和第五电阻R5相互串联形成的支路控制。在本实施例中，MOS晶体管Q1为P型晶体管，当MOS晶体管Q1的栅极处于低电位时，MOS晶体管Q1导通，当MOS晶体管Q1的栅极处于高电位时，MOS晶体管Q1断开。
当拨码开关S1闭合时，第四电阻R4、指示灯D1、拨码开关S1和第五电阻R5相互串联形成的支路导通，电源控制模块110的第三输出端向输出控制模块120输入低电位的负向电压，第四电阻R4的第一端接地，则第四电阻R4的第二端处于负向的低电位，则点C处于负向的低电位，MOS晶体管Q1的栅极连接于点C，同样处于负向的低电位，MOS晶体管Q1导通，第三电阻R3所在的支路导通，第三电阻R3与第二电阻R2并联；同时，指示灯D1点亮，指示开关控制单元121处于导通状态，进而指示该状态对应的驱动电路的输出电压状态。
相反的，当拨码开关S1断开时，第四电阻R4、指示灯D1、拨码开关S1和第五电阻R5相互串联形成的支路断开，第四电阻R4的第一端接地，则第四电阻R4的第一端为接地电位，即点C处于地电位，MOS晶体管Q1的栅极连接于点C，同样处于地电位，MOS晶体管Q1断开，第三电阻R3所在的支路断接；同时，指示灯D1不点亮，指示开关控制单元121处于断开状态，进而指示该状态对应的驱动电路的输出电压状态。
在本实施例中，第五电阻R5、指示灯D1也可以选择性的去除其中任意一个或两个，且不影响整个开关控制单元121的正常运行。
在本实施例中，开关控制单元121也可以直接采用拨码开关替代，该拨码开关的第一端与第三电阻的第二端连接，第二端接地。当拨码开关闭合时，第三电阻R3所在的支路导通，第三电阻R3与第二电阻R2并联；当拨码开关断开时，第三电阻R3所在的支路断接。
当驱动电路处于第一状态时，开关控制单元121断开，第三电阻R3所在的支路断接，第一电阻R1和第二电阻R2串联。驱动电路的输出电压Vout1为：
Vout1=VB(1+R1/R2)
其中，VB为第二电阻R2的第一端的电压，R1为第一电阻R1的电阻值，R2为第二电阻R2的电阻值。VB通常为一固定电压值，如-0.6V。
当驱动电路处于第二状态时，开关控制单元121导通，第三电阻R3所在的支路导通，第二电阻R2和第三电阻R3并联后与第一电阻R1串联。驱动电路的输出电压Vout2为：
Vout2=VB(1+R1×(R2+R3)/(R2×R3))
其中，VB为第二电阻R2的第一端的电压，R1为第一电阻R1的电阻值，R2为第二电阻R2的电阻值，R3为第三电阻R3的电阻值。VB通常为一固定电压值，如-0.6V。
由上述公式可知，驱动电路在第二状态下的输出电压Vout2的绝对值比在第一状态下的输出电压Vout1的绝对值大。在本申请实施例中，第三电阻R3可以是定值电阻，也可以是滑动电阻器。当第三电阻R3为定值电阻时，可以固定调节第二状态时驱动电路的输出电压Vout2；当第三电阻R3为滑动电阻器时，可以根据具体的需要，在一定范围内调节第二状态时驱动电路的输出电压Vout2。
当驱动电路处于第一状态时，显示面板处于一般状态，此时驱动电路的输出电压Vout1为正常输出电压。当驱动电路处于第二状态时，显示面板处于点灯测试状态，此时驱动电路的输出电压Vout2为点灯测试电压，点灯测试电压比正常输出电压高，即本申请实施例提供的驱动电路提高了点灯测试过程中的测试电压，使得mini LED灯板的细微损伤能够在点灯测试过程中及时暴露出来，有利于及时剔除残次品，提高出货品质，降低客诉或退货现象的发生。
相应的，本申请实施例还提供一种显示装置，该显示装置包括本申请实施例提供的任意一种驱动电路，具备本申请实施例提供的任意一种驱动电路的技术特征和技术效果，具体实施方式及工作原理请参照上述具体实施例，在此不再赘述。
综上所述，本申请实施例提供一种驱动电路及显示装置，该驱动电路包括：电源控制模块和输出控制模块，电源控制模块的输出端与输出控制模块的输入端连接，输出控制模块包括第一电阻、第二电阻、第三电阻和开关控制单元，开关控制单元与第三电阻串联后与所述二电阻并联，然后再与第一电阻串联；当驱动电路处于第一状态时，开关控制单元断开，第三电阻所在的支路断接，第一电阻和第二电阻串联，驱动电路输出电压Vout1；当驱动电路处于第二状态时，开关控制单元导通，第三电阻所在的支路导通，第三电阻与第二电阻并联后与第一电阻串联，驱动电路输出电压Vout2；Vout2的绝对值大于Vout1的绝对值。本申请实施例通过在驱动电路中设置开关控制单元，在显示面板处于点灯测试状态时，驱动电路处于第二状态时，驱动电路输出比正常输出电压更高的点灯测试电压，提高了点灯测试过程中的测试电压，使得mini LED灯板的细微损伤能够在点灯测试过程中及时暴露出来，有利于及时剔除残次品，提高出货品质，降低客诉或退货现象的发生。
以上对本申请实施例所提供的驱动电路及显示装置进行了详细介绍，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，综上所述，本说明书内容不应理解为对本申请的限制。

Claims (20)

  1. 一种驱动电路，其包括电源控制模块和输出控制模块，所述电源控制模块的输出端与所述输出控制模块的输入端连接，所述输出控制模块包括第一电阻、第二电阻、第三电阻和开关控制单元，所述开关控制单元与所述第三电阻串联后与所述二电阻并联，然后再与所述第一电阻串联；
    当所述驱动电路处于第一状态时，所述开关控制单元断开，所述第三电阻所在的支路断接，所述第一电阻和所述第二电阻串联，所述驱动电路输出电压Vout1；
    当所述驱动电路处于第二状态时，所述开关控制单元导通，所述第三电阻所在的支路导通，所述第三电阻与所述第二电阻并联后与所述第一电阻串联，所述驱动电路输出电压Vout2；
    所述Vout2的绝对值大于所述Vout1的绝对值。
  2. 如权利要求1所述的驱动电路，其中，所述开关控制单元为拨码开关。
  3. 如权利要求1所述的驱动电路，其中，所述开关控制单元至少包括一个MOS晶体管、一个拨码开关和一个电阻，所述拨码开关和所述电阻形成相互串联的支路，所述MOS晶体管与所述第三电阻串联，所述MOS晶体管的栅极与所述支路连接，通过所述支路的导通控制所述MOS晶体管的栅极电压。
  4. 如权利要求3所述的驱动电路，其中，所述支路的一端接输入电压，所述支路的另一端接地，所述拨码开关设于所述支路的电压接入端和所述MOS晶体管的栅极之间。
  5. 如权利要求4所述的驱动电路，其中，所述开关控制单元包括一个MOS晶体管、一个拨码开关和一个电阻。
  6. 如权利要求5所述的驱动电路，其中，所述拨码开关的第一端接所述输入电压，所述拨码开关的第二端与所述电阻的第一端、所述MOS晶体管的栅极连接，所述电阻的第二端接地。
  7. 如权利要求4所述的驱动电路，其中，所述开关控制单元包括一个MOS晶体管、一个拨码开关、一个指示灯和第四电阻、第五电阻，所述拨码开关、所述第四电阻、所述指示灯和所述第五电阻形成相互串联的支路。
  8. 如权利要求7所述的驱动电路，其中，所述第四电阻的第一端接所述输入电压，所述第四电阻的第二端与所述指示灯的第一端连接，所述指示灯的第二端与所述拨码开关的第一端连接，所述拨码开关的第二端与所述第五电阻的第一端、所述MOS晶体管的栅极连接，所述第五电阻的第二端接地。
  9. 如权利要求7所述的驱动电路，其中，所述第四电阻的第一端接所述输入电压，所述第四电阻的第二端与所述拨码开关的第一端连接，所述拨码开关的第二端与所述指示灯的第一端、所述MOS晶体管的栅极连接，所述指示灯的第二端与所述第五电阻的第一端连接，所述第五电阻的第二端接地。
  10. 如权利要求4所述的驱动电路，其中，所述电源控制模块的输入端接入第一外接电源，且与所述第一电阻的第一端、所述驱动电路的输出端连接，所述电源控制模块的输出端与所述第一电阻的第二端、所述第二电阻的第一端、所述第三电阻的第一端连接，所述第二电阻的第二端接地，所述MOS晶体管的第一端与所述第三电阻的第二端连接，所述MOS晶体管的第二端接地，所述拨码开关所在支路的第一端接入第二外接电源，所述拨码开关所在支路的第二端接地。
  11. 如权利要求4所述的驱动电路，其中，所述电源控制模块的输入端接入第一外接电源，所述电源控制模块的第一输出端与所述第一电阻的第一端连接且接地，所述电源控制模块的第二输出端与所述第一电阻的第二端、所述第二电阻的第一端、所述第三电阻的第一端连接，所述MOS晶体管的第一端与所述第三电阻的第二端连接，所述电源控制模块的第三输出端与所述第二电阻的第二端、所述MOS晶体管的第二端、所述拨码开关所在支路的第一端、以及所述驱动电路的输出端连接，所述拨码开关所在支路的第二端接地。
  12. 如权利要求10或11所述的驱动电路，其中，所述驱动电路还包括稳压模块，所述稳压模块的一端与所述电源控制模块连接，另一端与所述第一电阻的第一端连接，用于保证所述驱动电路输出电压的稳定性。
  13. 如权利要求12所述的驱动电路，其中，所述稳压模块至少包括电容或电感中的一种。
  14. 一种显示装置，其包括驱动电路，所述驱动电路包括电源控制模块和输出控制模块，所述电源控制模块的输出端与所述输出控制模块的输入端连接，所述输出控制模块包括第一电阻、第二电阻、第三电阻和开关控制单元，所述开关控制单元与所述第三电阻串联后与所述二电阻并联，然后再与所述第一电阻串联；
    当所述驱动电路处于第一状态时，所述开关控制单元断开，所述第三电阻所在的支路断接，所述第一电阻和所述第二电阻串联，所述驱动电路输出电压Vout1；
    当所述驱动电路处于第二状态时，所述开关控制单元导通，所述第三电阻所在的支路导通，所述第三电阻与所述第二电阻并联后与所述第一电阻串联，所述驱动电路输出电压Vout2；
    所述Vout2的绝对值大于所述Vout1的绝对值。
  15. 如权利要求14所述的显示装置，其中，所述开关控制单元为拨码开关。
  16. 如权利要求14所述的显示装置，其中，所述开关控制单元至少包括一个MOS晶体管、一个拨码开关和一个电阻，所述拨码开关和所述电阻形成相互串联的支路，所述MOS晶体管与所述第三电阻串联，所述MOS晶体管的栅极与所述支路连接，通过所述支路的导通控制所述MOS晶体管的栅极电压。
  17. 如权利要求16所述的显示装置，其中，所述支路的一端接输入电压，所述支路的另一端接地，所述拨码开关设于所述支路的电压接入端和所述MOS晶体管的栅极之间。
  18. 如权利要求17所述的显示装置，其中，所述拨码开关的第一端与所述电压接入端电性连接，所述拨码开关的第二端与所述电阻的第一端、所述MOS晶体管的栅极电性连接。
  19. 如权利要求18所述的显示装置，其中，所述电源控制模块的输入端接入第一外接电源，且与所述第一电阻的第一端、所述驱动电路的输出端连接，所述电源控制模块的输出端与所述第一电阻的第二端、所述第二电阻的第一端、所述第三电阻的第一端连接，所述第二电阻的第二端接地，所述MOS晶体管的第一端与所述第三电阻的第二端连接，所述MOS晶体管的第二端接地，所述拨码开关所在支路的第一端接入第二外接电源，所述拨码开关所在支路的第二端接地。
  20. 如权利要求18所述的显示装置，其中，所述电源控制模块的输入端接入第一外接电源，所述电源控制模块的第一输出端与所述第一电阻的第一端连接且接地，所述电源控制模块的第二输出端与所述第一电阻的第二端、所述第二电阻的第一端、所述第三电阻的第一端连接，所述MOS晶体管的第一端与所述第三电阻的第二端连接，所述电源控制模块的第三输出端与所述第二电阻的第二端、所述MOS晶体管的第二端、所述拨码开关所在支路的第一端、以及所述驱动电路的输出端连接，所述拨码开关所在支路的第二端接地。
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