WO2017063251A1 - 线路保护电路以及液晶显示器 - Google Patents

线路保护电路以及液晶显示器 Download PDF

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Publication number
WO2017063251A1
WO2017063251A1 PCT/CN2015/095620 CN2015095620W WO2017063251A1 WO 2017063251 A1 WO2017063251 A1 WO 2017063251A1 CN 2015095620 W CN2015095620 W CN 2015095620W WO 2017063251 A1 WO2017063251 A1 WO 2017063251A1
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Prior art keywords
module
optocoupler
line
circuit
woa
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Ceased
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PCT/CN2015/095620
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English (en)
French (fr)
Inventor
陈辛洪
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TCL China Star Optoelectronics Technology Co Ltd
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Shenzhen China Star Optoelectronics Technology Co Ltd
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Priority to US14/908,113 priority Critical patent/US9959797B2/en
Publication of WO2017063251A1 publication Critical patent/WO2017063251A1/zh
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • 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
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
    • G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
    • 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
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/1306—Details
    • G02F1/1309—Repairing; Testing
    • 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
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
    • G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
    • G09G3/3611—Control of matrices with row and column drivers
    • G09G3/3648—Control of matrices with row and column drivers using an active matrix
    • 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
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
    • G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
    • G09G3/3611—Control of matrices with row and column drivers
    • G09G3/3696—Generation of voltages supplied to electrode drivers
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H1/00—Details of emergency protective circuit arrangements
    • H02H1/0007—Details of emergency protective circuit arrangements concerning the detecting means
    • 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
    • H02H3/02—Details
    • H02H3/025—Disconnection after limiting, e.g. when limiting is not sufficient or for facilitating disconnection
    • 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
    • H02H3/16—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 fault current to earth, frame or mass
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/136—Liquid crystal cells structurally associated with a semi-conducting layer or substrate, e.g. cells forming part of an integrated circuit
    • G02F1/1362—Active matrix addressed cells
    • G02F1/136204—Arrangements to prevent high voltage or static electricity failures
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2300/00—Aspects of the constitution of display devices
    • G09G2300/04—Structural and physical details of display devices
    • G09G2300/0404—Matrix technologies
    • G09G2300/0408—Integration of the drivers onto the display substrate
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2310/00—Command of the display device
    • G09G2310/02—Addressing, scanning or driving the display screen or processing steps related thereto
    • G09G2310/0264—Details of driving circuits
    • G09G2310/0289—Details of voltage level shifters arranged for use in a driving circuit
    • 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
    • G09G2330/027—Arrangements or methods related to powering off a display
    • 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

Definitions

  • the present invention relates to the field of liquid crystal display, and more particularly to a line protection circuit and a liquid crystal display.
  • the driving circuit of the liquid crystal display generally includes a voltage management module (power IC) 110, a level shifting module 120, a WOA line module 130, a GOA line module 140, and a liquid crystal module 150.
  • a voltage management module power IC
  • level shifting module 120 One end of the connection level transfer module 120 of the voltage management module 110, the other end of the level transfer module 120 is connected to one end of the WOA line module 130, and the other end of the WOA line module 130 is connected to one end of the GOA line module 140, and the GOA line module The other end of 140 is connected to the liquid crystal module 150.
  • the voltage management module 110 is powered off for protection when the current exceeds the threshold. However, if the WOA line module 130 and the GOA line module 140 are short-circuited, if the current does not exceed the threshold, the voltage management module 110 does not power off and protect. This will cause the liquid crystal module 150 to be burned.
  • the technical problem to be solved by the embodiments of the present invention is to provide a line protection circuit and a liquid crystal display, which provide protection when the line is short-circuited.
  • the invention provides a line protection circuit, comprising: a detection module and a feedback module, wherein an output end of the power management module is connected to one end of the level transfer module, and the other end of the level transfer module is connected to the detection
  • the first end of the detecting module is connected to the WOA line module or the GOA line module, the third end of the detecting module is connected to one end of the feedback module, and the other end of the feedback module is connected.
  • the enabling end of the power management module, the detecting module includes an optocoupler and a current limiting resistor, wherein a first input end of the optocoupler is used to connect the other end of the level shifting module, a second input end of the optocoupler is configured to connect the WOA line module or the GOA line module, a first output end of the optocoupler is connected to one end of the current limiting resistor, and the other end of the current limiting resistor is For connecting a power source, the second output end of the optocoupler is used for grounding; the feedback module includes a voltage comparator and a switch tube, and a negative end of the voltage comparator is connected to the optocoupler and the current limiting resistor a common end of the voltage comparator for inputting a reference voltage, an output end of the voltage comparator is connected to a first end of the switch tube, and a second end of the switch tube is connected to the power management module The enabling end, the third end of the switch tube is grounded.
  • the current limiting resistor has a resistance of 10 kilo ohms.
  • the switch tube is a P-channel enhancement type triode.
  • the invention provides a line protection circuit, comprising: a detection module and a feedback module, wherein an output end of the power management module is connected to one end of the level transfer module, and the other end of the level transfer module is connected to the detection module
  • the first end of the detecting module is connected to the WOA line module or the GOA line module
  • the third end of the detecting module is connected to one end of the feedback module
  • the other end of the feedback module is connected to the An enabling end of the power management module
  • the detecting module is configured to detect whether the WOA line module or the GOA line module has a short circuit, and when there is a short circuit in the WOA line module or the GOA line module
  • the feedback module is configured to feed back a short circuit signal
  • the feedback module is configured to receive a short circuit signal fed back by the detection module, and send a non-enable signal to the enable end of the power management module according to the short circuit signal, so that the voltage is The management module is disabled.
  • the detecting module includes an optocoupler and a current limiting resistor, wherein a first input end of the optocoupler is used to connect another end of the level shifting module, and a second input end of the optocoupler For connecting the WOA line module or the GOA line module, a first output end of the optocoupler is connected to one end of the current limiting resistor, and the other end of the current limiting resistor is used to connect a power source, the optocoupler The second output is for grounding.
  • the feedback module includes a voltage comparator and a switch, a negative end of the voltage comparator is connected to a common end of the optocoupler and the current limiting resistor, and a positive end of the voltage comparator is used for input
  • the output end of the voltage comparator is connected to the first end of the switch tube, the second end of the switch tube is connected to the enable end of the power management module, and the third end of the switch tube is grounded.
  • the current limiting resistor has a resistance of 10 kilo ohms.
  • the switch tube is a P-channel enhancement type triode.
  • the present invention also provides a liquid crystal display comprising a liquid crystal display panel and a bottom plate, the liquid crystal display panel comprising a line protection circuit, the line protection circuit comprising: a detection module and a feedback module, wherein the output of the power management module is connected One end of the level shifting module is connected to the first end of the detecting module, and the second end of the detecting module is connected to the WOA line module or the GOA line module, and the detecting module is The third end is connected to one end of the feedback module, and the other end of the feedback module is connected to an enable end of the power management module, and the detection module is configured to detect whether the WOA line module or the GOA line module is There is a short circuit, and when there is a short circuit in the WOA line module or the GOA line module, the short circuit signal is fed back to the feedback module; the feedback module is configured to receive the short circuit signal fed back by the detection module, and according to the The short circuit signal sends a disable signal to the enable terminal of the power management module such that the voltage management
  • the detecting module includes an optocoupler and a current limiting resistor, wherein a first input end of the optocoupler is used to connect another end of the level shifting module, and a second input end of the optocoupler For connecting the WOA line module or the GOA line module, a first output end of the optocoupler is connected to one end of the current limiting resistor, and the other end of the current limiting resistor is used to connect a power source, the optocoupler The second output is for grounding.
  • the feedback module includes a voltage comparator and a switch, a negative end of the voltage comparator is connected to a common end of the optocoupler and the current limiting resistor, and a positive end of the voltage comparator is used for input
  • the output end of the voltage comparator is connected to the first end of the switch tube, the second end of the switch tube is connected to the enable end of the power management module, and the third end of the switch tube is grounded.
  • the current limiting resistor has a resistance of 10 kilo ohms.
  • the switch tube is a P-channel enhancement type triode.
  • the detecting module sends a short circuit signal to the feedback module when the WOA line module or the GOA line module is shorted, so that the feedback module sends a non-enable signal to the enable end of the power management module when receiving the short circuit signal.
  • the voltage management module is disabled and power is stopped, thereby preventing the WOA line module or the GOA line module from being burnt due to a short circuit.
  • FIG. 1 is a circuit diagram of a driver of a related art liquid crystal display
  • FIG. 2 is a circuit diagram of a line protection circuit according to an embodiment of the present invention.
  • FIG. 3 is a circuit diagram of another line protection circuit according to an embodiment of the present invention.
  • FIG. 4 is a circuit diagram of still another line protection circuit according to an embodiment of the present invention.
  • FIG. 2 is a circuit diagram of a line protection circuit according to an embodiment of the present invention.
  • the line protection circuit of the embodiment includes: a detection module 230 and a feedback module 270.
  • the output end of the power management module 210 is connected to one end of the level transfer module 220, and the other end of the level transfer module 220 is connected to the detection module 230.
  • the first end of the detection module 230 is connected to one end of the WOA line module 240, the other end of the WOA line module 240 is connected to one end of the GOA line module 250, and the other end of the GOA line module 250 is connected to the liquid crystal module 260.
  • the third end of the connection module 270 is connected to one end of the feedback module 270, and the other end of the feedback module 270 is connected to the enable end of the power management module 210.
  • the power management module 210 is typically a power IC, such as a TNY274PN, TNY280PN, etc. chip.
  • the power management module 210 converts the commercial power of the alternating current into a plurality of direct currents such as 5V, 12V, and the like, and outputs the same to the level shift 220.
  • Level transfer module 220 will power management module
  • the DC voltage outputted by 210 becomes a voltage matching the voltage of the liquid crystal module 260, and is output to the detecting module 230.
  • the detection module 230 transmits the voltage output by the level shifting module 220 to the WOA line module 240, which in turn transmits the voltage to the GOA line module 250.
  • the GOA line module 250 then transmits the voltage to the liquid crystal module 260 to drive the liquid crystal module 260 to operate.
  • the detecting module 230 detects that the current on the circuit increases sharply, and the detecting module 232 outputs a feedback short circuit signal to the feedback module 270.
  • the feedback module 270 receives the short circuit signal fed back by the detection module 230, and sends a non-enable signal to the enable end of the power management module 210 according to the short circuit signal.
  • the non-enable signal causes the power management module 210 to be disabled, thereby ensuring that the power management module 210, the power management module 210, and the liquid crystal module 260 are not burned out.
  • FIG. 3 is a circuit diagram of another line protection circuit according to an embodiment of the present invention.
  • the line protection circuit of the embodiment includes: a detection module 230 and a feedback module 270, wherein an output end of the power management module 210 is connected to the first end of the level transfer module 220, and a second end of the level transfer module 220 is connected to the WOA line.
  • One end of the module 240, the other end of the WOA line module 240 is connected to the first end of the GOA line module 250, the second end of the GOA line module 250 is connected to the liquid crystal module 260, and the first end of the detecting module 230 is connected to the level shifting module 220.
  • the third end of the detection module 230 is connected to the GOA line module 250.
  • the third end of the detection module 230 is connected to one end of the feedback module 270, and the other end of the feedback module 270 is connected to the enable end of the power management module 210.
  • the power management module 210 is typically a power IC, such as a TNY274PN, TNY280PN, etc. chip.
  • the power management module 210 converts the commercial power of the alternating current into a plurality of direct currents such as 5V, 12V, and the like, and outputs the same to the level shifting module 220.
  • the level shifting module 220 changes the DC voltage output by the power management module 210 to a voltage matching the voltage of the liquid crystal module 260, and outputs the voltage to the WOA line module 240 and the detecting module 230, respectively.
  • the WOA line module 240 and the detection module 230 transmit voltages to the GOA line module 250.
  • the GOA line module 250 transmits a voltage to the liquid crystal module 260 to drive the liquid crystal module 260 to operate.
  • the detecting module 230 detects that the current on the circuit increases sharply, and then the detecting module 232 sends the feedback module.
  • 270 output feedback short circuit signal.
  • the feedback module 270 receives the short circuit signal fed back by the detection module 230, and sends a non-enable signal to the enable end of the power management module 210 according to the short circuit signal.
  • the non-enable signal causes the power management module 210 to be disabled, thereby ensuring that the power management module 210, the power management module 210, and the liquid crystal module 260 are not burned out.
  • FIG. 4 is a circuit diagram of still another circuit protection circuit according to an embodiment of the present invention.
  • the line protection circuit of the embodiment includes a detection module 230 and a feedback module 270.
  • the detection module 230 includes an optocoupler 231 and a current limiting resistor 232.
  • the current limiting resistor 232 has a resistance of 10 kilo ohms.
  • the feedback module 270 includes a voltage comparator 271 and a switch transistor 272, which is a P-channel enhancement type triode.
  • the output end of the power management module 210 is connected to one end of the level transfer module 220, the other end of the level transfer module 220 is connected to the first end input end of the optocoupler 231, and the second input end of the optocoupler 231 is connected to one end of the WOA line module 240.
  • the other end of the WOA line module 240 is connected to one end of the GOA line module 250.
  • the other end of the GOA line module 250 is connected to the liquid crystal module 260.
  • the first output end of the optocoupler 231 is connected to one end of the current limiting resistor 232, and the other end of the current limiting resistor 232 is connected.
  • the second output of the optocoupler 231 is used for grounding.
  • the negative terminal of the voltage comparator 271 is connected to the common terminal of the optocoupler 231 and the current limiting resistor 232.
  • the positive terminal of the voltage comparator 271 is used for inputting a reference voltage, and the output terminal of the voltage comparator 271 is connected to the first end of the switch transistor 272.
  • the second end of the tube 272 is connected to the enable end of the power management module 210, and the third end of the switch tube 272 is grounded.
  • the power management module 210 is typically a power IC, such as a TNY274PN, TNY280PN, etc. chip.
  • the power management module 210 converts the commercial power of the alternating current into a plurality of direct currents such as 5V, 12V, and the like, and outputs the same to the level shift 220.
  • the level shifting module 220 changes the DC voltage output by the power management module 210 to a voltage matching the voltage of the liquid crystal module 260, and outputs the voltage to the detecting module 230.
  • the WOA line module 240 and the GOA line module 250 are not short-circuited, the voltage output by the level shifting module 220 is transmitted to the WOA line module 240 through the light-emitting diodes in the optocoupler 231, and the WOA line module 240 transmits the voltage to the GOA line module. 250.
  • the GOA line module 250 then transmits the voltage to the liquid crystal module 260 to drive the liquid crystal module 260 to operate. Since the WOA line module 240 and the GOA line module 250 are not short-circuited, they pass through the light-emitting diodes in the optocoupler 231. The current is not large, the light generated by the LED is not large, and the phototransistor in the photocoupler 231 is turned off.
  • the current generated by the power source VCC is input to the negative terminal of the comparator 271 through the current limiting resistor 232.
  • the voltage at the negative terminal of the input comparator 271 is greater than the reference voltage at the positive terminal of the input comparator, so the output of the comparator 271 outputs a low level to the first terminal of the switch transistor 272. Under the action of the low level, the switch tube 272 is turned off, and the power management module 210 operates normally.
  • the short circuit occurs in the WOA line module 240 or the GOA line module 250
  • the current passing through the light emitting diodes in the optocoupler 231 increases sharply, so that the light generated by the light emitting diodes increases, and the phototransistor in the photocoupler 231 is turned on, low.
  • the level is input to the negative terminal of the comparator 271 through the photo transistor.
  • the voltage at the negative terminal of the input comparator 271 is less than the reference voltage at the positive terminal of the input comparator, so the output of the comparator 271 outputs a high level to the first terminal of the switch transistor 272.
  • the switch tube 272 is turned on, and the low level is output to the enable end of the power management module 210 so that the power management module 210 is disabled, thereby ensuring the power management module 210, the power management module 210, and the liquid crystal module 260. Not burned out.
  • the detecting module sends a short circuit signal to the feedback module when the WOA line module or the GOA line module is shorted, so that the feedback module sends a non-enable signal to the enable end of the power management module when receiving the short circuit signal.
  • the voltage management module is disabled and power is stopped, thereby preventing the WOA line module or the GOA line module from being burnt due to a short circuit.
  • the present invention also provides a liquid crystal display comprising a liquid crystal display panel and a bottom plate, the liquid crystal display panel comprising the line protection circuit as shown in FIG. 2, FIG. 3 and FIG. 4, please refer to FIG. 2 to FIG. 4 and related descriptions. I will not repeat them one by one.
  • the storage medium may be a magnetic disk, an optical disk, a read-only memory (ROM), or a random access memory (RAM).

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Computer Hardware Design (AREA)
  • Theoretical Computer Science (AREA)
  • Nonlinear Science (AREA)
  • Optics & Photonics (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)
  • Liquid Crystal Display Device Control (AREA)
  • Liquid Crystal (AREA)

Abstract

一种线路保护电路以及液晶显示器。该线路保护电路包括：侦测模块（230）以及反馈模块（270）。其中，电压管理模块（210）的输出端连接电平转移模块（220）的一端，电平转移模块（220）的另一端连接侦测模块（230）的第一端，侦测模块（230）的第二端连接WOA线路模块（240）或GOA线路模块（250），侦测模块（230）的第三端连接反馈模块（270）的一端，反馈模块（270）的另一端连接电压管理模块（210）的使能端。侦测模块（230）用于检测WOA线路模块（240）或GOA线路模块（250）是否存在短路，并在WOA线路模块（240）或GOA线路模块（250）存在短路时，向反馈模块（270）反馈短路信号；反馈模块（270）用于接收侦测模块（230）反馈的短路信号，并根据短路信号向电压管理模块（210）的使能端发送非使能信号，使得电压管理模块（210）被禁用。该线路保护电路以及液晶显示器能够防止 WOA线路模块或GOA线路模块因为短路而导致烧毁。

Description

线路保护电路以及液晶显示器
本发明要求2015年10月13日递交的发明名称为“线路保护电路以及液晶显示器”的申请号201510670979.8的在先申请优先权，上述在先申请的内容以引入的方式并入本文本中。
技术领域
本发明涉及液晶显示领域，尤其涉及一种线路保护电路以及液晶显示器。
背景技术
如图1所示，液晶显示器的驱动电路通常包括电压管理模块(power IC)110、电平转移模块120、WOA线路模块130、GOA线路模块140以及液晶模块150。其中，电压管理模块110的连接电平转移模块120的一端、电平转移模块120的另一端连接WOA线路模块130的一端、WOA线路模块130的另一端连接GOA线路模块140的一端，GOA线路模块140的另一端连接液晶模块150。电压管理模块110在电流超过阈值时会断电进行保护，但是，如果WOA线路模块130、GOA线路模块140出现了短路时，如果电流没有超过阈值，则电压管理模块110并不会断电进行保护，就会导致液晶模块150会被烧毁。
发明内容
本发明实施例所要解决的技术问题在于，提供一种线路保护电路以及液晶显示器，实现在线路短路时提供保护。
本发明提供了一种一种线路保护电路，包括：侦测模块以及反馈模块，其中，电源管理模块的输出端连接电平转移模块的一端，所述电平转移模块的另一端连接所述侦测模块的第一端，所述侦测模块的第二端连接WOA线路模块或GOA线路模块，所述侦测模块的第三端连接所述反馈模块的一端，所述反馈模块的另一端连接所述电源管理模块的使能端，所述侦测模块包括光耦以及限流电阻，其中，所述光耦的第一输入端用于连接所述电平转移模块的另一端， 所述光耦的第二输入端用于连接所述WOA线路模块或所述GOA线路模块，所述光耦的第一输出端连接所述限流电阻的一端，所述限流电阻的另一端用于连接电源，所述光耦的第二输出端用于接地；所述反馈模块包括电压比较器以及开关管，所述电压比较器的负端连接所述光耦和所述限流电阻的公共端，所述电压比较器的正端用于输入参考电压，所述电压比较器的输出端连接所述开关管的第一端，所述开关管的第二端连接所述电源管理模块的使能端，所述开关管的第三端接地。
可选地，所述限流电阻的阻值为10千欧姆。
可选地，所述开关管为P沟道增强型三极管。
本发明提供了一种线路保护电路，包括：侦测模块以及反馈模块，其中，电源管理模块的输出端连接电平转移模块的一端，所述电平转移模块的另一端连接所述侦测模块的第一端，所述侦测模块的第二端连接WOA线路模块或GOA线路模块，所述侦测模块的第三端连接所述反馈模块的一端，所述反馈模块的另一端连接所述电源管理模块的使能端，所述侦测模块用于检测所述WOA线路模块或所述GOA线路模块是否存在短路，并在所述WOA线路模块或所述GOA线路模块存在短路时，向所述反馈模块反馈短路信号；所述反馈模块用于接收所述侦测模块反馈的短路信号，并根据所述短路信号向所述电源管理模块的使能端发送非使能信号，使得所述电压管理模块被禁用。
可选地，所述侦测模块包括光耦以及限流电阻，其中，所述光耦的第一输入端用于连接所述电平转移模块的另一端，所述光耦的第二输入端用于连接所述WOA线路模块或所述GOA线路模块，所述光耦的第一输出端连接所述限流电阻的一端，所述限流电阻的另一端用于连接电源，所述光耦的第二输出端用于接地。
可选地，所述反馈模块包括电压比较器以及开关管，所述电压比较器的负端连接所述光耦和所述限流电阻的公共端，所述电压比较器的正端用于输入参考电压，所述电压比较器的输出端连接所述开关管的第一端，所述开关管的第二端连接所述电源管理模块的使能端，所述开关管的第三端接地。
可选地，所述限流电阻的阻值为10千欧姆。
可选地，所述开关管为P沟道增强型三极管。
本发明还提供了一种液晶显示器，包括液晶显示面板以及底板，所述液晶显示面板包括线路保护电路，所述线路保护电路包括：侦测模块以及反馈模块，其中，电源管理模块的输出端连接电平转移模块的一端，所述电平转移模块的另一端连接所述侦测模块的第一端，所述侦测模块的第二端连接WOA线路模块或GOA线路模块，所述侦测模块的第三端连接所述反馈模块的一端，所述反馈模块的另一端连接所述电源管理模块的使能端，所述侦测模块用于检测所述WOA线路模块或所述GOA线路模块是否存在短路，并在所述WOA线路模块或所述GOA线路模块存在短路时，向所述反馈模块反馈短路信号；所述反馈模块用于接收所述侦测模块反馈的短路信号，并根据所述短路信号向所述电源管理模块的使能端发送非使能信号，使得所述电压管理模块被禁用。
可选地，所述侦测模块包括光耦以及限流电阻，其中，所述光耦的第一输入端用于连接所述电平转移模块的另一端，所述光耦的第二输入端用于连接所述WOA线路模块或所述GOA线路模块，所述光耦的第一输出端连接所述限流电阻的一端，所述限流电阻的另一端用于连接电源，所述光耦的第二输出端用于接地。
可选地，所述反馈模块包括电压比较器以及开关管，所述电压比较器的负端连接所述光耦和所述限流电阻的公共端，所述电压比较器的正端用于输入参考电压，所述电压比较器的输出端连接所述开关管的第一端，所述开关管的第二端连接所述电源管理模块的使能端，所述开关管的第三端接地。
可选地，所述限流电阻的阻值为10千欧姆。
可选地，所述开关管为P沟道增强型三极管。
通过实施本发明实施例，侦测模块在WOA线路模块或GOA线路模块短路时向反馈模块发送短路信号，使得反馈模块在接收到短路信号时向电源管理模块的使能端发送非使能信号，使得电压管理模块被禁用而停止供电，从而防止WOA线路模块或GOA线路模块因为短路而导致烧毁。
附图说明
为了更清楚地说明本发明实施例或现有技术中的技术方案，下面将对实施例或现有技术描述中所需要使用的附图作简单地介绍，显而易见地，下面描述 中的附图仅仅是本发明的一些实施例，对于本领域普通技术人员来讲，在不付出创造性劳动的前提下，还可以根据这些附图获得其他的附图。
图1是现有技术的液晶显示器的驱动器的电路图；
图2是本发明实施例提供的一种线路保护电路的电路图；
图3是本发明实施例提供的另一种线路保护电路的电路图；
图4是本发明实施例提供的再一种线路保护电路的电路图。
具体实施方式
下面将结合本发明实施例中的附图，对本发明实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例仅仅是本发明一部分实施例，而不是全部的实施例。基于本发明中的实施例，本领域普通技术人员在没有作出创造性劳动前提下所获得的所有其他实施例，都属于本发明保护的范围。
需要说明的是，在本发明实施例中使用的术语是仅仅出于描述特定实施例的目的，而非旨在限制本发明。在本发明实施例和所附权利要求书中所使用的单数形式的“一种”、“所述”和“该”也旨在包括多数形式，除非上下文清楚地表示其他含义。还应当理解，本文中使用的术语“和/或”是指并包含一个或多个相关联的列出项目的任何或所有可能组合。
请参阅图2，图2是本发明实施例提供的一种线路保护电路的电路图。本实施例的线路保护电路包括：侦测模块230以及反馈模块270，其中，电源管理模块210的输出端连接电平转移模块220的一端，电平转移模块220的另一端连接侦测模块230的第一端，侦测模块230的第二端连接WOA线路模块240的一端，WOA线路模块240的另一端连接GOA线路模块250的一端，GOA线路模块250的另一端连接液晶模块260，侦测模块230的第三端连接反馈模块270的一端，反馈模块270的另一端连接电源管理模块210的使能端。
电源管理模块210通常为power IC，例如，TNY274PN、TNY280PN等等芯片。电源管理模块210将交流的市电转变为5V、12V等多种的直流电，并输出到电平转移模块(level shift)220中。电平转移模块220将电源管理模块 210输出的直流电压变成与液晶模块260的电压匹配的电压，并输出到侦测模块230。
在WOA线路模块240和GOA线路模块250没有短路时，侦测模块230将电平转移模块220输出的电压传输到WOA线路模块240，WOA线路模块240再将电压传输至GOA线路模块250。GOA线路模块250再将电压传输至液晶模块260以驱动液晶模块260进行工作。在WOA线路模块240或GOA线路模块250发生短路时，侦测模块230侦测到电路上的电流急剧增大，于是，侦测模块232向反馈模块270输出反馈短路信号。反馈模块270接收侦测模块230反馈的短路信号，并根据短路信号向电源管理模块210的使能端发送非使能信号。非使能信号使得电源管理模块210被禁用，从而确保电源管理模块210、电源管理模块210以及液晶模块260不被烧坏。
请参阅图3，图3是本发明实施例提供的另一种线路保护电路的电路图。本实施例的线路保护电路包括：侦测模块230以及反馈模块270，其中，电源管理模块210的输出端连接电平转移模块220的第一端，电平转移模块220的第二端连接WOA线路模块240的一端，WOA线路模块240的另一端连接GOA线路模块250的第一端，GOA线路模块250的第二端连接液晶模块260，侦测模块230的第一端连接电平转移模块220的第三端，侦测模块230的第二端连接GOA线路模块250，侦测模块230的第三端连接反馈模块270的一端，反馈模块270的另一端连接电源管理模块210的使能端。
电源管理模块210通常为power IC，例如，TNY274PN、TNY280PN等等芯片。电源管理模块210将交流的市电转变为5V、12V等多种的直流电，并输出到电平转移模块220中。电平转移模块220将电源管理模块210输出的直流电压变成与液晶模块260的电压匹配的电压，并分别输出到WOA线路模块240以及侦测模块230。WOA线路模块240以及侦测模块230将电压传输给GOA线路模块250。
在GOA线路模块250没有短路时，GOA线路模块250将电压传输至液晶模块260以驱动液晶模块260进行工作。在GOA线路模块250发生短路时，侦测模块230侦测到电路上的电流急剧增大，于是，侦测模块232向反馈模块 270输出反馈短路信号。反馈模块270接收侦测模块230反馈的短路信号，并根据短路信号向电源管理模块210的使能端发送非使能信号。非使能信号使得电源管理模块210被禁用，从而确保电源管理模块210、电源管理模块210以及液晶模块260不被烧坏。
请参阅图4，图4是本发明实施例提供的再一种线路保护电路的电路图。本实施例的线路保护电路包括：侦测模块230以及反馈模块270，其中，侦测模块230包括光耦231以及限流电阻232，限流电阻232的阻值为10千欧姆。反馈模块270包括电压比较器271以及开关管272，开关管272为P沟道增强型三极管。
电源管理模块210的输出端连接电平转移模块220的一端，电平转移模块220的另一端连接光耦231第一端输入端，光耦231的第二输入端连接WOA线路模块240的一端，WOA线路模块240的另一端连接GOA线路模块250的一端，GOA线路模块250的另一端连接液晶模块260，光耦231的第一输出端连接限流电阻232的一端，限流电阻232的另一端用于连接电源VCC，光耦231的第二输出端用于接地。电压比较器271的负端连接光耦231和限流电阻232的公共端，电压比较器271的正端用于输入参考电压，电压比较器271的输出端连接开关管272的第一端，开关管272的第二端连接电源管理模块210的使能端，开关管272的第三端接地。
电源管理模块210通常为power IC，例如，TNY274PN、TNY280PN等等芯片。电源管理模块210将交流的市电转变为5V、12V等多种的直流电，并输出到电平转移模块(level shift)220中。电平转移模块220将电源管理模块210输出的直流电压变成与液晶模块260的电压匹配的电压，并输出到侦测模块230中。
在WOA线路模块240和GOA线路模块250没有短路时，电平转移模块220输出的电压透过光耦231中的发光二极管传输到WOA线路模块240，WOA线路模块240再将电压传输至GOA线路模块250。GOA线路模块250再将电压传输至液晶模块260以驱动液晶模块260进行工作。由于WOA线路模块240和GOA线路模块250没有短路，所以，通过光耦231中的发光二极管的 电流不大，发光二极管所产生的光线不大，光耦231中的光敏三极管截止。电源VCC产生的电流通过限流电阻232输入到比较器271的负端。输入比较器271负端的电压大于输入比较器正端的参考电压，所以比较器271的输出端输出低电平至开关管272的第一端。在低电平的作用下，开关管272截止，电源管理模块210正常工作。
在WOA线路模块240或GOA线路模块250发生短路时，通过光耦231中的发光二极管的电流急剧增大，于是，发光二极管所产生的光线增大，光耦231中的光敏三极管导通，低电平通过光敏三极管输入到比较器271的负端。输入比较器271负端的电压小于输入比较器正端的参考电压，所以比较器271的输出端输出高电平至开关管272的第一端。在高电平的作用下，开关管272导通，向电源管理模块210的使能端输出低电平使得电源管理模块210被禁用，从而确保电源管理模块210、电源管理模块210以及液晶模块260不被烧坏。
通过实施本发明实施例，侦测模块在WOA线路模块或GOA线路模块短路时向反馈模块发送短路信号，使得反馈模块在接收到短路信号时向电源管理模块的使能端发送非使能信号，使得电压管理模块被禁用而停止供电，从而防止WOA线路模块或GOA线路模块因为短路而导致烧毁。
本发明还提供了一种液晶显示器，包括液晶显示面板以及底板，液晶显示面板包括如图2、图3、图4所示的线路保护电路，具体请参阅图2至图4以及相关描述，此处不再一一赘述。
本领域普通技术人员可以理解实现上述实施例方法中的全部或部分流程，是可以通过计算机程序来指令相关的硬件来完成，所述的程序可存储于一计算机可读取存储介质中，该程序在执行时，可包括如上述各方法的实施例的流程。其中，所述的存储介质可为磁碟、光盘、只读存储记忆体(Read-Only Memory，ROM)或随机存储记忆体(Random Access Memory，RAM)等。
以上所揭露的仅为本发明一种较佳实施例而已，当然不能以此来限定本发明之权利范围，本领域普通技术人员可以理解实现上述实施例的全部或部分流 程，并依本发明权利要求所作的等同变化，仍属于发明所涵盖的范围。

Claims (13)

  1. 一种线路保护电路，其特征在于，包括：侦测模块以及反馈模块，其中，电源管理模块的输出端连接电平转移模块的一端，所述电平转移模块的另一端连接所述侦测模块的第一端，所述侦测模块的第二端连接WOA线路模块或GOA线路模块，所述侦测模块的第三端连接所述反馈模块的一端，所述反馈模块的另一端连接所述电源管理模块的使能端，
    所述侦测模块包括光耦以及限流电阻，其中，所述光耦的第一输入端用于连接所述电平转移模块的另一端，所述光耦的第二输入端用于连接所述WOA线路模块或所述GOA线路模块，所述光耦的第一输出端连接所述限流电阻的一端，所述限流电阻的另一端用于连接电源，所述光耦的第二输出端用于接地；
    所述反馈模块包括电压比较器以及开关管，所述电压比较器的负端连接所述光耦和所述限流电阻的公共端，所述电压比较器的正端用于输入参考电压，所述电压比较器的输出端连接所述开关管的第一端，所述开关管的第二端连接所述电源管理模块的使能端，所述开关管的第三端接地。
  2. 根据权利要求1所述的电路，其特征在于，所述限流电阻的阻值为10千欧姆。
  3. 根据权利要求1所述的电路，其特征在于，所述开关管为P沟道增强型三极管。
  4. 一种线路保护电路，其特征在于，包括：侦测模块以及反馈模块，其中，电源管理模块的输出端连接电平转移模块的一端，所述电平转移模块的另一端连接所述侦测模块的第一端，所述侦测模块的第二端连接WOA线路模块或GOA线路模块，所述侦测模块的第三端连接所述反馈模块的一端，所述反馈模块的另一端连接所述电源管理模块的使能端，
    所述侦测模块用于检测所述WOA线路模块或所述GOA线路模块是否存在短路，并在所述WOA线路模块或所述GOA线路模块存在短路时，向所述反馈模块反馈短路信号；
    所述反馈模块用于接收所述侦测模块反馈的短路信号，并根据所述短路信号向所述电源管理模块的使能端发送非使能信号，使得所述电压管理模块被禁用。
  5. 根据权利要求4所述的电路，其特征在于，所述侦测模块包括光耦以及限流电阻，其中，所述光耦的第一输入端用于连接所述电平转移模块的另一端，所述光耦的第二输入端用于连接所述WOA线路模块或所述GOA线路模块，所述光耦的第一输出端连接所述限流电阻的一端，所述限流电阻的另一端用于连接电源，所述光耦的第二输出端用于接地。
  6. 根据权利要求4所述的电路，其特征在于，所述反馈模块包括电压比较器以及开关管，所述电压比较器的负端连接所述光耦和所述限流电阻的公共端，所述电压比较器的正端用于输入参考电压，所述电压比较器的输出端连接所述开关管的第一端，所述开关管的第二端连接所述电源管理模块的使能端，所述开关管的第三端接地。
  7. 根据权利要求6所述的电路，其特征在于，所述限流电阻的阻值为10千欧姆。
  8. 根据权利要求4所述的电路，其特征在于，所述开关管为P沟道增强型三极管。
  9. 一种液晶显示器，其特征在于，包括液晶显示面板以及底板，所述液晶显示面板包括线路保护电路，所述线路保护电路包括：侦测模块以及反馈模块，其中，电源管理模块的输出端连接电平转移模块的一端，所述电平转移模块的另一端连接所述侦测模块的第一端，所述侦测模块的第二端连接WOA线路模块或GOA线路模块，所述侦测模块的第三端连接所述反馈模块的一端，所述反馈模块的另一端连接所述电源管理模块的使能端，
    所述侦测模块用于检测所述WOA线路模块或所述GOA线路模块是否存在短路，并在所述WOA线路模块或所述GOA线路模块存在短路时，向所述反馈模块反馈短路信号；
    所述反馈模块用于接收所述侦测模块反馈的短路信号，并根据所述短路信号向所述电源管理模块的使能端发送非使能信号，使得所述电压管理模块被禁用。
  10. 根据权利要求9所述的液晶显示器，其特征在于，所述侦测模块包括光耦以及限流电阻，其中，所述光耦的第一输入端用于连接所述电平转移模块的另一端，所述光耦的第二输入端用于连接所述WOA线路模块或所述GOA 线路模块，所述光耦的第一输出端连接所述限流电阻的一端，所述限流电阻的另一端用于连接电源，所述光耦的第二输出端用于接地。
  11. 根据权利要求9所述的液晶显示器，其特征在于，所述反馈模块包括电压比较器以及开关管，所述电压比较器的第一输入负端连接所述光耦和所述限流电阻的公共端，所述电压比较器的正端用于输入参考电压，所述电压比较器的输出端连接所述开关管的第一端，所述开关管的第二端连接所述电源管理模块的使能端，所述开关管的第三端接地。
  12. 根据权利要求11所述的液晶显示器，其特征在于，所述限流电阻的阻值为10千欧姆。
  13. 根据权利要求9所述的液晶显示器，其特征在于，所述开关管为P沟道增强型三极管。
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