WO2017210985A1 - 一种液晶显示面板的侦测电路和侦测方法 - Google Patents

一种液晶显示面板的侦测电路和侦测方法 Download PDF

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Publication number
WO2017210985A1
WO2017210985A1 PCT/CN2016/093129 CN2016093129W WO2017210985A1 WO 2017210985 A1 WO2017210985 A1 WO 2017210985A1 CN 2016093129 W CN2016093129 W CN 2016093129W WO 2017210985 A1 WO2017210985 A1 WO 2017210985A1
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Prior art keywords
voltage
control signal
switch
turned
comparator
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PCT/CN2016/093129
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English (en)
French (fr)
Inventor
张先明
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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 JP2019514158A priority Critical patent/JP6850876B2/ja
Priority to US15/128,211 priority patent/US10170026B2/en
Priority to KR1020197000358A priority patent/KR102177861B1/ko
Publication of WO2017210985A1 publication Critical patent/WO2017210985A1/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
    • G09G3/006—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
    • 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
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/06—Adjustment of display parameters
    • G09G2320/0626—Adjustment of display parameters for control of overall brightness
    • 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
    • G09G2360/00—Aspects of the architecture of display systems
    • G09G2360/14—Detecting light within display terminals, e.g. using a single or a plurality of photosensors

Definitions

  • the present invention generally relates to the field of display technologies, and in particular, to a detection circuit and a detection method for a liquid crystal display panel.
  • liquid crystal display panels such as TN-LCD, VA-LCD, IPS-LCD, etc.
  • the liquid crystal display panel works normally is usually judged by human eyes. For example, when the liquid crystal display panel is black screened by human eyes, it can be judged that the liquid crystal display panel cannot be normally displayed. However, since the liquid crystal display panel is in a normal use process, when the liquid crystal display panel has problems such as Gamma drift, data disorder, and insufficient driving voltage, although the liquid crystal display panel can be normally displayed, it may cause color shift, insufficient brightness, and the like. Since these problems are sometimes not found in time and effectively by human eyes, the user experience is degraded, and if the problem that the user does not find in time is further deteriorated, a more serious problem may occur (for example, the liquid crystal display screen is burnt out). Wait).
  • problems such as Gamma drift, data disorder, and insufficient driving voltage
  • the object of the present invention is to provide a detection circuit and a detection method for a liquid crystal display panel, so as to solve the problem that the existing liquid crystal display screen is normally operated by human eye observation, and it is not easy to find some users in time. A flaw in the perceived problem.
  • a detection circuit of a liquid crystal display panel includes: at least one photo sensor for detecting brightness of the liquid crystal display panel, and detecting the detected Converting brightness into a first voltage; an operational amplifier for predetermining the first voltage The ratio is amplified to generate a second voltage; and a comparison circuit is configured to generate a control signal that causes the power of the liquid crystal display panel to be turned off by comparing the second voltage generated by the operational amplifier with the plurality of reference voltages.
  • the comparison circuit includes: a first comparator, configured to compare the second voltage with a first reference voltage; and a first switch that is turned on in response to the first control signal output by the first comparator or a second comparator for comparing the second voltage with a second reference voltage; and a second switch that is turned on or off in response to a second control signal output by the second comparator, wherein the second reference voltage Greater than the first reference voltage, and when the first control signal controls the first switch to be turned on or the second control signal controls the second switch to be turned on, the power of the liquid crystal display panel is turned off according to the conduction of the first switch or the second switch .
  • the comparison circuit includes: a third comparator, configured to compare the second voltage with a third reference voltage; and a fourth comparator, configured to perform the second voltage and the fourth reference voltage Comparing; or a circuit, performing a OR operation on the third control signal outputted by the third comparator and the fourth control signal output by the fourth comparator, thereby generating a fifth control signal; and the third switch responding to the output through the OR circuit
  • the fifth control signal is turned on or off, wherein the fourth reference voltage is greater than the third reference voltage, and when the fifth control signal controls the third switch to be turned on, the power of the liquid crystal display panel is turned off according to the conduction of the third switch.
  • the first control signal output by the first comparator controls the first switch to be turned on, when the second voltage is less than the first reference voltage
  • the first control signal outputted by the first comparator controls the first switch to be turned off; when the second voltage is less than the second reference voltage, the second control signal output by the second comparator controls the second switch to be turned on.
  • the second control signal output by the second comparator controls the second switch to be turned off.
  • the third control signal output by the third comparator controls the third switch to be turned on, when the second voltage is less than the third reference voltage.
  • the third control signal outputted by the third comparator controls the third switch to be turned off; when the second voltage is less than the fourth reference voltage, the fourth control signal output by the fourth comparator controls the third switch to be turned on.
  • the fourth control signal output by the fourth comparator controls the third switch to be turned off.
  • a method for detecting a liquid crystal display panel includes: detecting, by at least one photosensor, brightness of the liquid crystal display panel, and detecting the detected brightness Converting to a first voltage; amplifying the first voltage by a predetermined ratio by an operational amplifier to generate a second voltage; and comparing, by comparing, a second voltage generated by the operational amplifier with the plurality of reference voltages to generate a liquid crystal display
  • the panel's power is turned off by the control signal.
  • the step of comparing, by the comparing circuit, the second voltage generated by the operational amplifier with the plurality of reference voltages to generate a control signal that causes the power of the liquid crystal display panel to be turned off includes: the second The voltage is compared with the first reference voltage, and the first control signal is turned on or off by the first switch in response to the first comparator output; the second voltage is compared with the second reference voltage by the second comparator, The second switch is turned on or off in response to the second control signal output by the second comparator, wherein the second reference voltage is greater than the first reference voltage, and when the first control signal controls the first switch to be turned on or the second control signal is controlled When the second switch is turned on, the power of the liquid crystal display panel is turned off according to the conduction of the first switch or the second switch.
  • the step of comparing, by the comparing circuit, the second voltage generated by the operational amplifier with the plurality of reference voltages to generate a control signal that causes the power of the liquid crystal display panel to be turned off includes: the second The voltage is compared with a third reference voltage; the second voltage is compared with a fourth reference voltage by a fourth comparator; the third control signal output by the OR circuit to the third comparator and the fourth comparator output
  • the fourth control signal performs an OR operation to generate a fifth control signal; the third switch is turned on or off in response to a fifth control signal output through the OR circuit, wherein the fourth reference voltage is greater than the third reference voltage, and
  • the fifth control signal controls the third switch to be turned on, the power of the liquid crystal display panel is turned off according to the conduction of the third switch.
  • the first control signal output by the first comparator controls the first switch to be turned on, when the second voltage is less than the first reference voltage
  • the first control signal outputted by the first comparator controls the first switch to be turned off; when the second voltage is less than the second reference voltage, the second control signal outputted by the second comparator controls the second switch And when the second voltage is greater than the second reference voltage, the second control signal output by the second comparator controls the second switch to be turned off.
  • a third control signal output by the third comparator controls the third switch to be turned on, when the second voltage is less than the third reference voltage Time,
  • the third control signal outputted by the third comparator controls the third switch to be turned off; when the second voltage is less than the fourth reference voltage, the fourth control signal output by the fourth comparator controls the third switch to be turned on,
  • the fourth control signal output by the fourth comparator controls the third switch to be turned off.
  • the power supply can be turned off in time when the liquid crystal display panel has a problem, thereby effectively preventing more serious problems from occurring.
  • FIG. 1 is a structural view showing a detecting circuit of a liquid crystal display panel according to an embodiment of the present invention
  • FIG. 2 is a structural diagram showing an example of a comparison circuit in the detection circuit shown in FIG. 1;
  • FIG. 3 is a structural diagram showing another example of a comparison circuit in the detection circuit shown in FIG. 1;
  • FIG. 4 is a circuit diagram showing a detecting circuit of a liquid crystal display panel according to an embodiment of the present invention.
  • FIG. 5 is a flow chart showing a method of detecting a liquid crystal display panel according to an embodiment of the present invention.
  • FIG. 1 is a view showing the configuration of a detecting circuit of a liquid crystal display panel according to an embodiment of the present invention.
  • the detection circuit of the liquid crystal display panel according to the present invention includes at least one photosensor 100, an operational amplifier 200, and a comparison circuit 300.
  • each of the at least one photosensor 100 is used to detect the brightness of the liquid crystal display panel and convert the detected brightness into a first voltage.
  • each of the photosensors 100 can be hidden in any frame of the liquid crystal display panel.
  • the four sensors 100 can be hidden in the four corners of the liquid crystal display panel.
  • each photosensor 100 can convert the detected optical signal indicating the brightness of the liquid crystal display panel during operation into a first voltage, and convert the first voltage It is input to the operational amplifier 200.
  • the operational amplifier 200 is configured to amplify the first voltage by a predetermined ratio to generate a second voltage.
  • the operational amplifier is a circuit unit having a high amplification factor, and the first voltage may be amplified at a predetermined ratio to generate a second voltage.
  • the comparison circuit 300 is for generating a control signal that causes the power supply 400 of the liquid crystal display panel to be turned off by comparing the second voltage generated by the operational amplifier 200 with a plurality of reference voltages.
  • the operating voltage of the liquid crystal display panel may also be abnormal. Therefore, the current working voltage of the liquid crystal display panel can be compared with the predetermined voltage to timely understand the current work of the liquid crystal display panel. status.
  • FIG. 2 is a block diagram showing an example of a comparison circuit 300 in the detection circuit shown in FIG. 1.
  • the comparison circuit 300 can include a first comparator 310, a first switch 320, a second comparator 330, and a second switch 340.
  • the first comparator 310 can be used to compare the second voltage with a first reference voltage; the second comparator 330 is configured to compare the second voltage with a second reference voltage.
  • the first switch 320 may be turned on or off in response to the first control signal output by the first comparator 310, and the second switch 340 is turned on or off in response to the second control signal output by the second comparator 330.
  • the first switch 320 or the second switch 340 may be a field effect transistor such as an NMOS transistor or a PMOS transistor used as an electronic switch.
  • the second reference voltage is greater than the first reference voltage, and when the first control signal controls the first switch 320 to be turned on or the second control signal controls the second switch 340 to be turned on, the power supply 400 of the liquid crystal display panel is according to the first switch 320. Or the second switch 340 is turned on and turned off.
  • the first control signal output by the first comparator 310 controls the first switch 320 to be turned on, when the second voltage is less than the first reference At the time of voltage, the first control signal output by the first comparator 310 controls the first switch 320 to be turned off.
  • the second control signal output by the second comparator 330 controls the second switch 340 to be turned on, and when the second voltage is greater than the second reference voltage, the second comparator The second control signal output by 330 controls the second switch 340 to be turned off. That is, when one of the first switch 320 and the second switch 340 is turned on, the switch enable signal of the liquid crystal display panel can be grounded, thereby turning off the power supply 400 of the liquid crystal display panel.
  • FIG. 3 is a block diagram showing another example of the comparison circuit 300 in the detection circuit shown in FIG. 1.
  • the comparison circuit 300 can include a third comparator 350, a fourth comparator 360, or a circuit 370 and a third switch 380.
  • the third comparator 350 can be used to compare the second voltage with a third reference voltage
  • the fourth comparator 360 can be used to compare the second voltage with a fourth reference voltage
  • the OR circuit 370 performs an OR operation on the third control signal output from the third comparator and the fourth control signal output from the fourth comparator, thereby generating a fifth control signal.
  • the OR circuit 370 may be a unit circuit that performs basic logic operations and logical operations.
  • the third switch 380 can be turned “on” or “off” in response to a fifth control signal output by the OR circuit 370.
  • the third switch 380 may also be a field effect transistor such as an NMOS transistor or a PMOS transistor used as an electronic switch.
  • the fourth reference voltage is greater than the third reference voltage, and when the fifth control signal controls the third switch 380 to be turned on, the power of the liquid crystal display panel is turned off according to the conduction of the third switch 380.
  • the third control signal output by the third comparator 350 controls the third switch 380 to be turned on, when the second voltage is less than the third reference.
  • the third control signal output by the third comparator controls the third switch 380 to be turned off.
  • the fourth control signal output by the fourth comparator controls the third switch 380 to be turned on, and when the second voltage is greater than the fourth reference voltage, the fourth The fourth control signal output by the comparator 360 controls the third switch 380 to be turned off.
  • the OR circuit 370 can generate a fifth control signal for controlling the third switch 380 to be turned on.
  • the grounding enable signal of the liquid crystal display panel can be grounded, thereby turning off the power supply 400 of the liquid crystal display panel.
  • the comparison circuit 300 includes a first comparator 310, a first switch 320, a second comparator 330, and a second switch 340.
  • one end of the photosensor 100 is connected to a voltage of 5V, and the other end of the photosensor 100 is connected to the forward input terminal of the operational amplifier 200.
  • the negative input terminal of the operational amplifier 200 is connected to one end of the resistor R2, and the other end of the resistor R2 is grounded.
  • the output terminal of the operational amplifier 200 is connected in parallel to the forward input terminal of the first comparator 310 and the negative input terminal of the second comparator 320.
  • the negative input terminal of the first comparator 310 is connected to the first reference voltage VREF1, and the second The forward input end of the comparator 320 is connected to the second reference voltage VREF2, the output end of the first comparator 310 is connected to the source of the first switch 330, and the output end of the second comparator 320 is connected to the source of the second switch 340.
  • the drain of a switch 330 is connected to the control terminal of the power supply, and the drain of the second switch 340 is connected to the control terminal of the power supply.
  • the photo sensor 100 detects the brightness of the liquid crystal display panel, and converts the detected brightness into a first voltage V1.
  • the operational amplifier 200 amplifies the first voltage V1 by a predetermined ratio after receiving the first voltage V1 to generate a first
  • the second voltage V2 is input to the first comparator 310 and the second comparator 330, and the first comparator 310 compares the second voltage V2 with the first reference voltage VREF1, wherein When the second voltage V2 is greater than the first reference voltage VREF1, it is proved that the brightness of the liquid crystal display panel is higher than the normal brightness, and an abnormality may occur, for example, Gamma drift, data disorder, etc., and the first comparator 310 may generate
  • the first switch 330 is turned on when receiving the first control signal (for example, a high level signal) for turning on the first switch 320, thereby causing the liquid crystal display panel power supply
  • the power enable signal is grounded to control the power to turn off.
  • the first comparator 310 is generated for making the first The first control signal is turned off by the switch 320. Therefore, the first switch 330 is in an off state, and the liquid crystal display panel is normally displayed.
  • the second comparator 330 compares the second voltage V2 with the second reference voltage VREF2, wherein, when the second voltage V2 is smaller than the second reference voltage VREF2, it is proved that the brightness of the liquid crystal display panel is lower than the normal brightness, and an abnormality may occur, for example, Gamma drift, data disorder, etc., and the second comparator 330 may Generating a second control signal for turning on the second switch 340, the second switch 340 is turned on when receiving a second control signal (eg, a high level signal) for turning it on, thereby causing liquid crystal display
  • the power supply enable signal of the panel power supply is grounded to control the power off.
  • the second comparator 330 when the second voltage V2 is greater than the second reference voltage VREF2, it is proved that the brightness of the liquid crystal display panel is not lower than the normal brightness, in the normal display state, and the second comparator 330 generates the second switch 340.
  • the second control signal is cut off. Therefore, the second switch is in an off state, and the liquid crystal display panel is normally displayed.
  • the second reference voltage VREF2 is greater than the first reference voltage VREF1, and therefore, only one of the first comparator 310 and the second comparator 330 may generate a control signal for controlling the corresponding switch to be turned on.
  • the power can be turned off in the event of a problem in the liquid crystal display panel in time, effectively preventing more serious problems from occurring.
  • FIG. 5 is a flow chart showing a method of detecting a liquid crystal display panel according to an embodiment of the present invention.
  • step S100 the brightness of the liquid crystal display panel is detected by at least one photosensor 100, and the detected brightness is converted into a first voltage.
  • the detected optical signal indicating the brightness of the liquid crystal display panel during operation may be converted into a first voltage by the at least one photosensor 100, and the first voltage may be input to the operational amplifier 200.
  • the first voltage is amplified by a predetermined ratio by the operational amplifier 200 to generate a second voltage.
  • a comparison signal 300 is used to compare the second voltage generated by the operational amplifier 200 with a plurality of reference voltages to generate a control signal that causes the power supply 400 of the liquid crystal display panel to be turned off.
  • the operating voltage of the liquid crystal display panel may also be abnormal. Therefore, the current working voltage of the liquid crystal display panel can be compared with the predetermined voltage to timely understand the current state of the liquid crystal display panel. Working status.
  • the second voltage is compared with the first reference voltage by the first comparator 310, and turned on or off by the first switch 320 in response to the first control signal output by the first comparator 310;
  • the device 330 compares the second voltage with a second reference voltage, and is turned on or off by the second switch 340 in response to the second control signal output by the second comparator 330.
  • the second reference voltage is greater than the first reference voltage, and when the first control signal controls the first switch 320 to be turned on or the second control signal controls the second switch 340 to be turned on, the power of the liquid crystal display panel is according to the first switch 320 or The second switch 340 is turned on and turned off.
  • the first control signal output by the first comparator 310 controls the first switch 320 to be turned on, when the second voltage is less than the first
  • the first control signal outputted by the first comparator 310 controls the first switch 320 to be turned off
  • the second control signal output by the second comparator 330 The second switch 340 is controlled to be turned on.
  • the second control signal output by the second comparator 330 controls the second switch 340 to be turned off. That is, when one of the first switch 320 and the second switch 340 is turned on, the switch enable signal of the liquid crystal display panel can be grounded, thereby turning off the power supply 400 of the liquid crystal display panel.
  • the second voltage is compared to a third reference voltage by a third comparator 350, the second voltage is compared to a fourth reference voltage by a fourth comparator 360;
  • the third control signal output by the third comparator 350 and the fourth control signal output by the fourth comparator 360 perform an OR operation to generate a fifth control signal;
  • the fifth control signal is output by the third switch 380 in response to the fifth control signal output through the OR circuit Turn on or off.
  • the fourth reference voltage is greater than the third reference voltage, and when the fifth control signal controls the third switch 380 to be turned on, the power of the liquid crystal display panel is turned off according to the conduction of the third switch 380.
  • the third control signal output by the third comparator 350 controls the third switch 380 to be turned on, when the second voltage is less than the third
  • the third control signal output by the third comparator 350 controls the third switch 380 to be turned off.
  • the fourth control signal output by the fourth comparator 360 controls the third switch 380 to be turned on, when the second voltage is greater than the fourth reference voltage, By the fourth The fourth control signal output by the comparator 360 controls the third switch 380 to be turned off.
  • the OR circuit 370 when one of the third control signal and the fourth control signal is a control signal that controls the third switch 370 to be turned on, the OR circuit 370 generates a fifth control signal for controlling the third switch 380 to be turned on.
  • the grounding enable signal of the liquid crystal display panel can be grounded, thereby turning off the power supply 400 of the liquid crystal display panel.
  • the power supply can be turned off in time when the liquid crystal display panel has a problem, thereby effectively preventing more serious problems from occurring. .

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

Abstract

一种液晶显示面板的侦测电路和侦测方法，所述侦测电路包括：至少一个光传感器(100)，用于检测液晶显示面板的亮度，并将检测到的亮度转换成第一电压(V1)；运算放大器(200)，用于将所述第一电压(V1)按预定比例进行放大以产生第二电压(V2)；比较电路(300)，用于通过将运算放大器(200)产生的第二电压(V2)与多个参考电压进行比较以产生使得液晶显示面板的电源(400)被关闭的控制信号。根据所述侦测电路和方法，能够及时地在液晶显示面板出现问题的情况下关闭电源(400)，有效地防止了更严重的问题产生。

Description

一种液晶显示面板的侦测电路和侦测方法 技术领域
本发明总体说来涉及显示技术领域，更具体地讲，尤其涉及一种液晶显示面板的侦测电路和侦测方法。
背景技术
随着液晶显示技术的发展，越来越多的终端设备(如，平板电脑、智能手机、智能电视等)使用液晶显示面板(如，TN-LCD、VA-LCD和IPS-LCD等)作为其主显示屏幕。
目前，液晶显示面板是否正常工作通常是通过人眼观察判断，例如，当通过人眼观察发现液晶显示面板黑屏时，可判断液晶显示面板无法正常显示。然而，由于液晶显示面板在正常使用过程中，当液晶显示面板发生Gamma漂移、数据错乱、驱动电压不足等问题时，虽然液晶显示面板可以正常显示，但是会带来色偏、亮度不足等现象，由于通过人眼观察有时并不能及时有效地发现这些问题，因此使得用户体验降低，并且，如果用户未及时发现的问题一旦进一步恶化，会导致更严重的问题产生(例如，液晶显示屏幕被烧坏等)。
因此，现有的通过人眼观察来侦测液晶显示屏幕是否正常工作的方式无法及时地发现一些用户不易察觉的问题。
发明内容
有鉴于此，本发明目的是提供一种液晶显示面板的侦测电路和侦测方法，以解决现有的通过人眼观察来侦测液晶显示屏幕是否正常工作的方式无法及时地发现一些用户不易察觉的问题的缺陷。
根据本发明示例性实施例的一方面，提供一种液晶显示面板的侦测电路，其中，所述侦测电路包括：至少一个光传感器，用于检测液晶显示面板的亮度，并将检测到的亮度转换成第一电压；运算放大器，用于将所述第一电压按预定 比例进行放大以产生第二电压；比较电路，用于通过将运算放大器产生的第二电压与多个参考电压进行比较以产生使得液晶显示面板的电源被关闭的控制信号。
可选地，所述比较电路包括：第一比较器，用于将所述第二电压与第一参考电压进行比较；第一开关，响应于第一比较器输出的第一控制信号导通或截止；第二比较器，用于将所述第二电压与第二参考电压进行比较；第二开关，响应于第二比较器输出的第二控制信号导通或截止，其中，第二参考电压大于第一参考电压，并且当第一控制信号控制第一开关导通或者第二控制信号控制第二开关导通时，液晶显示面板的电源根据第一开关或第二开关的导通而被关闭。
可选地，所述比较电路包括：第三比较器，用于将所述第二电压与第三参考电压进行比较；第四比较器，用于将所述第二电压与第四参考电压进行比较；或电路，对第三比较器输出的第三控制信号和第四比较器输出的第四控制信号执行或运算，从而产生第五控制信号；第三开关，响应于通过或电路输出的第五控制信号而导通或截止，其中，第四参考电压大于第三参考电压，并且当第五控制信号控制第三开关导通时，液晶显示面板的电源根据第三开关的导通而被关闭。
可选地，当所述第二电压大于所述第一参考电压时，第一比较器输出的第一控制信号控制第一开关导通，当所述第二电压小于所述第一参考电压时，第一比较器输出的第一控制信号控制第一开关截止；当所述第二电压小于所述第二参考电压时，第二比较器输出的第二控制信号控制第二开关导通，当所述第二电压大于所述第二参考电压时，第二比较器输出的第二控制信号控制第二开关截止。
可选地，当所述第二电压大于所述第三参考电压时，第三比较器输出的第三控制信号控制第三开关导通，当所述第二电压小于所述第三参考电压时，第三比较器输出的第三控制信号控制第三开关截止；当所述第二电压小于所述第四参考电压时，第四比较器输出的第四控制信号控制第三开关导通，当所述第二电压大于所述第四参考电压时，第四比较器输出的第四控制信号控制第三开关截止。
根据本发明示例性实施例的另一方面，提供一种液晶显示面板的侦测方法，其中，所述侦测方法包括：由至少一个光传感器检测液晶显示面板的亮度，并将检测到的亮度转换成第一电压；由运算放大器将所述第一电压按预定比例进行放大以产生第二电压；由比较电路通过将运算放大器产生的第二电压与多个参考电压进行比较以产生使得液晶显示面板的电源被关闭的控制信号。
可选地，由比较电路通过将运算放大器产生的第二电压与多个参考电压进行比较以产生使得液晶显示面板的电源被关闭的控制信号的步骤包括：由第一比较器将所述第二电压与第一参考电压进行比较，由第一开关响应于第一比较器输出的第一控制信号导通或截止；由第二比较器将所述第二电压与第二参考电压进行比较，由第二开关响应于第二比较器输出的第二控制信号导通或截止，其中，第二参考电压大于第一参考电压，并且当第一控制信号控制第一开关导通或者第二控制信号控制第二开关导通时，液晶显示面板的电源根据第一开关或第二开关的导通而被关闭。
可选地，由比较电路通过将运算放大器产生的第二电压与多个参考电压进行比较以产生使得液晶显示面板的电源被关闭的控制信号的步骤包括：由第三比较器将所述第二电压与第三参考电压进行比较；由第四比较器将所述第二电压与第四参考电压进行比较；由或电路对第三比较器输出的第三控制信号和第四比较器输出的第四控制信号执行或运算，从而产生第五控制信号；由第三开关响应于通过或电路输出的第五控制信号而导通或截止，其中，第四参考电压大于第三参考电压，并且当第五控制信号控制第三开关导通时，液晶显示面板的电源根据第三开关的导通而被关闭。
可选地，当所述第二电压大于所述第一参考电压时，由第一比较器输出的第一控制信号控制第一开关导通，当所述第二电压小于所述第一参考电压时，由第一比较器输出的第一控制信号控制第一开关截止；当所述第二电压小于所述第二参考电压时，由第二比较器输出的第二控制信号控制第二开关导通，当所述第二电压大于所述第二参考电压时，由第二比较器输出的第二控制信号控制第二开关截止。
可选地，当所述第二电压大于所述第三参考电压时，由第三比较器输出的第三控制信号控制第三开关导通，当所述第二电压小于所述第三参考电压时， 由第三比较器输出的第三控制信号控制第三开关截止；当所述第二电压小于所述第四参考电压时，由第四比较器输出的第四控制信号控制第三开关导通，当所述第二电压大于所述第四参考电压时，由第四比较器输出的第四控制信号控制第三开关截止。
根据本发明示例性实施例提供的液晶显示屏幕的侦测电路和侦测方法，能够及时地在液晶显示面板出现问题的情况下关闭电源，有效地防止了更严重的问题产生。
附图说明
通过下面结合附图进行的详细描述，本发明示例性实施例的上述和其它目的、特点和优点将会变得更加清楚，其中：
图1示出本发明的一个实施例的液晶显示面板的侦测电路的结构图；
图2示出图1所示出的侦测电路中的比较电路的一个示例的结构图；
图3示出图1所示出的侦测电路中的比较电路的另一个示例的结构图；
图4示出本发明的一个实施例的液晶显示面板的侦测电路的电路图；
图5示出本发明的一个实施例的液晶显示面板的侦测方法的流程图。
具体实施方式
现在，将参照附图更充分地描述不同的示例实施例，其中，一些示例性实施例在附图中示出，其中，相同的标号始终表示相同的部件。
图1示出本发明的一个实施例的液晶显示面板的侦测电路的结构图。
如图1所示，根据本发明的液晶显示面板的侦测电路包括：至少一个光传感器100、运算放大器200和比较电路300。
具体说来，至少一个光传感器100中的每个光传感器100用于检测液晶显示面板的亮度，并将检测到的亮度转换成第一电压。这里，可将每个光传感器100隐藏设置于液晶显示面板的任意边框里，优选地，可将四个传感器100隐藏设置于液晶显示面板的四个边角中。具体说来，每个光传感器100可将检测的指示液晶显示面板工作时亮度的光信号转换成第一电压，并将所述第一电压 输入给运算放大器200。
运算放大器200用于将所述第一电压按预定比例进行放大以产生第二电压。这里，作为示例，所述运算放大器为具有高放大倍数的电路单元，可以将所述第一电压按预定比例进行放大以产生第二电压。
比较电路300用于通过将运算放大器200产生的第二电压与多个参考电压进行比较以产生使得液晶显示面板的电源400被关闭的控制信号。
具体说来，由于液晶显示面板工作异常时，液晶显示面板的工作电压也会产生异常，因此，可通过将液晶显示面板当前工作电压与预定电压进行比较的方式来及时了解液晶显示面板当前的工作状态。
下面，将结合具体的示例来描述将第二电压与多个参考电压进行比较以产生使得液晶显示面板的电源被关闭的示例。
图2示出图1所示出的侦测电路中的比较电路300的一个示例的结构图。
如图2所示，比较电路300可包括：第一比较器310，第一开关320、第二比较器330和第二开关340。
这里，作为示例，第一比较器310可用于将所述第二电压与第一参考电压进行比较；第二比较器330用于将所述第二电压与第二参考电压进行比较。
第一开关320可响应于第一比较器310输出的第一控制信号导通或截止，第二开关340响应于第二比较器330输出的第二控制信号导通或截止。这里，所述第一开关320或第二开关340可以是被用作电子开关的NMOS管、PMOS管等场效应管。
其中，第二参考电压大于第一参考电压，并且当第一控制信号控制第一开关320导通或者第二控制信号控制第二开关340导通时，液晶显示面板的电源400根据第一开关320或第二开关340的导通而被关闭。
具体说来，当所述第二电压大于所述第一参考电压时，第一比较器310输出的第一控制信号控制第一开关320导通，当所述第二电压小于所述第一参考电压时，第一比较器310输出的第一控制信号控制第一开关320截止。当所述 第二电压小于所述第二参考电压时，第二比较器330输出的第二控制信号控制第二开关340导通，当所述第二电压大于所述第二参考电压时，第二比较器330输出的第二控制信号控制第二开关340截止。也就是说，当第一开关320和第二开关340中二者之一是导通的时，可使液晶显示面板的开关使能信号接地，从而关闭液晶显示面板的电源400。
图3示出图1所示出的侦测电路中的比较电路300的另一个示例的结构图。
如图3所示，比较电路300可包括：第三比较器350，第四比较器360、或电路370和第三开关380。
这里，作为示例，第三比较器350可用于将所述第二电压与第三参考电压进行比较，第四比较器360可用于将所述第二电压与第四参考电压进行比较。
或电路370对第三比较器输出的第三控制信号和第四比较器输出的第四控制信号执行或运算，从而产生第五控制信号。这里，所述或电路370可以是执行基本逻辑运算和符合逻辑运算的单元电路。
第三开关380可响应于通过或电路370输出的第五控制信号而导通或截止。这里，所述第三开关380也可以是被用作电子开关的NMOS管、PMOS管等场效应管。
其中，第四参考电压大于第三参考电压，并且当第五控制信号控制第三开关380导通时，液晶显示面板的电源根据第三开关380的导通而被关闭。
具体说来，当所述第二电压大于所述第三参考电压时，第三比较器350输出的第三控制信号控制第三开关380导通，当所述第二电压小于所述第三参考电压时，第三比较器输出的第三控制信号控制第三开关380截止。当所述第二电压小于所述第四参考电压时，第四比较器输出的第四控制信号控制第三开关380导通，当所述第二电压大于所述第四参考电压时，第四比较器360输出的第四控制信号控制第三开关380截止。也就是说，当第三控制信号和第四控制信号二者之一是控制第三开关370导通的控制信号时，或电路370可产生用于控制第三开关380导通的第五控制信号，可使液晶显示面板的开关使能信号接地，从而关闭液晶显示面板的电源400。
下面，将结合图4来详细描述根据本发明示例性实施例的液晶显示面板的侦测电路的电路图的一个示例。
如图4所示，作为示例，比较电路300包括第一比较器310、第一开关320、第二比较器330和第二开关340。具体说来，光传感器100的一端连接5V电压，光传感器100的另一端连接运算放大器200的正向输入端，运算放大器200的负向输入端连接电阻R2的一端，电阻R2的另一端接地，运算放大器200的输出端并联地连接第一比较器310的正向输入端和第二比较器320的负向输入端，第一比较器310的负向输入端连接第一参考电压VREF1，第二比较器320的正向输入端连接第二参考电压VREF2，第一比较器310的输出端连接第一开关330的源极，第二比较器320的输出端连接第二开关340的源极，第一开关330的漏极与电源的控制端相连接，第二开关340的漏极与电源的控制端相连接。
以下，对根据本发明示例性实施例的液晶显示面板的侦测电路的工作原理进行描述。
具体说来，光传感器100检测液晶显示面板的亮度，并将检测的亮度转换成第一电压V1，运算放大器200在接收到第一电压V1后将第一电压V1按预定比例进行放大以产生第二电压V2，并将所述第二电压V2分别输入给第一比较器310和第二比较器330，第一比较器310将所述第二电压V2与第一参考电压VREF1进行比较，其中，当所述第二电压V2大于第一参考电压VREF1时，则证明液晶显示面板的亮度相对于正常亮度偏高，可能出现异常，例如，Gamma漂移、数据错乱等，第一比较器310会产生用于使第一开关320导通的第一控制信号，第一开关330在接收到用于使其导通的第一控制信号(例如，高电平信号)时导通，从而使得液晶显示面板电源的电源使能信号接地，从而控制电源关闭。相应地，当所述第二电压V2小于第一参考电压VREF1，则证明液晶显示面板的亮度并未高于正常亮度，处于正常显示状态，因此，第一比较器310会产生用于使第一开关320截止的第一控制信号，因此，第一开关330处于截止状态，液晶显示面板正常显示。
此外，在第一比较器310将第二电压V2与第一参考电压VREF1进行比较的同时，第二比较器330将所述第二电压V2与第二参考电压VREF2进行比较， 其中，当所述第二电压V2小于第二参考电压VREF2时，则证明液晶显示面板的亮度相对于正常亮度偏低，可能出现异常，例如，Gamma漂移、数据错乱等，第二比较器330会产生用于使第二开关340导通的第二控制信号，第二开关340在接收到用于使其导通的第二控制信号(例如，高电平信号)时导通，从而使得液晶显示面板电源的电源使能信号接地，从而控制电源关闭。相应地，当所述第二电压V2大于第二参考电压VREF2，则证明液晶显示面板的亮度并未低于正常亮度，处于正常显示状态，第二比较器330会产生用于使第二开关340截止的第二控制信号，因此，第二开关处于截止状态，液晶显示面板正常显示。
这里，应注意，第二参考电压VREF2大于第一参考电压VREF1，因此，第一比较器310和第二比较器330之中仅有一个可能产生用于控制对应开关导通的控制信号。
在根据本发明示例性实施例的液晶显示面板的侦测电路中，能够及时地在液晶显示面板出现问题的情况下关闭电源，有效地防止了更严重的问题产生。
图5示出本发明的一个实施例的液晶显示面板的侦测方法的流程图。
如图5所示，在步骤S100，由至少一个光传感器100检测液晶显示面板的亮度，并将检测到的亮度转换成第一电压。具体说来，可由至少一个光传感器100将检测的指示液晶显示面板工作时亮度的光信号转换成第一电压，并将所述第一电压输入给运算放大器200。
在步骤S200，由运算放大器200将所述第一电压按预定比例进行放大以产生第二电压。
在步骤S300，由比较电路300通过将运算放大器200产生的第二电压与多个参考电压进行比较以产生使得液晶显示面板的电源400被关闭的控制信号。
具体说来，由于当液晶显示面板工作异常时，液晶显示面板的工作电压也会产生异常，因此，可通过将液晶显示面板当前工作电压与预定电压进行比较的方式来及时了解液晶显示面板当前的工作状态。
下面，将结合具体的示例来描述将第二电压与多个参考电压进行比较以产 生使得液晶显示面板的电源被关闭的示例。
作为示例，由第一比较器310将所述第二电压与第一参考电压进行比较，由第一开关320响应于第一比较器310输出的第一控制信号导通或截止；由第二比较器330将所述第二电压与第二参考电压进行比较，由第二开关340响应于第二比较器330输出的第二控制信号导通或截止。
其中，第二参考电压大于第一参考电压，并且当第一控制信号控制第一开关320导通或者第二控制信号控制第二开关340导通时，液晶显示面板的电源根据第一开关320或第二开关340的导通而被关闭。
具体说来，当所述第二电压大于所述第一参考电压时，由第一比较器310输出的第一控制信号控制第一开关320导通，当所述第二电压小于所述第一参考电压时，由第一比较器310输出的第一控制信号控制第一开关320截止；当所述第二电压小于所述第二参考电压时，由第二比较器330输出的第二控制信号控制第二开关340导通，当所述第二电压大于所述第二参考电压时，由第二比较器330输出的第二控制信号控制第二开关340截止。也就是说，当第一开关320和第二开关340中二者之一是导通的时，可使液晶显示面板的开关使能信号接地，从而关闭液晶显示面板的电源400。
作为另一示例，由第三比较器350将所述第二电压与第三参考电压进行比较，由第四比较器360将所述第二电压与第四参考电压进行比较；由或电路370对第三比较器350输出的第三控制信号和第四比较器360输出的第四控制信号执行或运算，从而产生第五控制信号；由第三开关380响应于通过或电路输出的第五控制信号而导通或截止。
其中，第四参考电压大于第三参考电压，并且当第五控制信号控制第三开关380导通时，液晶显示面板的电源根据第三开关380的导通而被关闭。
具体说来，当所述第二电压大于所述第三参考电压时，由第三比较器350输出的第三控制信号控制第三开关380导通，当所述第二电压小于所述第三参考电压时，由第三比较器350输出的第三控制信号控制第三开关380截止。当所述第二电压小于所述第四参考电压时，由第四比较器360输出的第四控制信号控制第三开关380导通，当所述第二电压大于所述第四参考电压时，由第四 比较器360输出的第四控制信号控制第三开关380截止。也就是说，当第三控制信号和第四控制信号二者之一是控制第三开关370导通的控制信号时，由或电路370产生用于控制第三开关380导通的第五控制信号，可使液晶显示面板的开关使能信号接地，从而关闭液晶显示面板的电源400。
综上所述，在根据本发明示例性实施例的液晶面板的侦测电路和侦测方法中，能够及时地在液晶显示面板出现问题的情况下关闭电源，有效地防止了更严重的问题产生。
显然，本发明的保护范围并不局限于上诉的具体实施方式，本领域的技术人员可以对发明进行各种改动和变型而不脱离本发明的精神和范围。这样，倘若本发明的这些修改和变型属于本发明权利要求及其等同技术的范围之内，则本发明也意图包含这些改动和变型在内。

Claims (10)

  1. 一种液晶显示面板的侦测电路，其中，所述侦测电路包括：
    至少一个光传感器，用于检测液晶显示面板的亮度，并将检测到的亮度转换成第一电压；
    运算放大器，用于将所述第一电压按预定比例进行放大以产生第二电压；
    比较电路，用于通过将运算放大器产生的第二电压与多个参考电压进行比较以产生使得液晶显示面板的电源被关闭的控制信号。
  2. 如权利要求1所述的侦测电路，其中，所述比较电路包括：
    第一比较器，用于将所述第二电压与第一参考电压进行比较；
    第一开关，响应于第一比较器输出的第一控制信号导通或截止；
    第二比较器，用于将所述第二电压与第二参考电压进行比较；
    第二开关，响应于第二比较器输出的第二控制信号导通或截止，
    其中，第二参考电压大于第一参考电压，并且当第一控制信号控制第一开关导通或者第二控制信号控制第二开关导通时，液晶显示面板的电源根据第一开关或第二开关的导通而被关闭。
  3. 如权利要求1所述的侦测电路，其中，所述比较电路包括：
    第三比较器，用于将所述第二电压与第三参考电压进行比较；
    第四比较器，用于将所述第二电压与第四参考电压进行比较；
    或电路，对第三比较器输出的第三控制信号和第四比较器输出的第四控制信号执行或运算，从而产生第五控制信号；
    第三开关，响应于通过或电路输出的第五控制信号而导通或截止，
    其中，第四参考电压大于第三参考电压，并且当第五控制信号控制第三开关导通时，液晶显示面板的电源根据第三开关的导通而被关闭。
  4. 如权利要求2所述的侦测电路，其中，当所述第二电压大于所述第一参考电压时，第一比较器输出的第一控制信号控制第一开关导通，当所述第二电压小于所述第一参考电压时，第一比较器输出的第一控制信号控制第一开关截止；
    当所述第二电压小于所述第二参考电压时，第二比较器输出的第二控制信号控制第二开关导通，当所述第二电压大于所述第二参考电压时，第二比较器输出的第二控制信号控制第二开关截止。
  5. 如权利要求3所述的侦测电路，其中，当所述第二电压大于所述第三参考电压时，第三比较器输出的第三控制信号控制第三开关导通，当所述第二电压小于所述第三参考电压时，第三比较器输出的第三控制信号控制第三开关截止；
    当所述第二电压小于所述第四参考电压时，第四比较器输出的第四控制信号控制第三开关导通，当所述第二电压大于所述第四参考电压时，第四比较器输出的第四控制信号控制第三开关截止。
  6. 一种液晶显示面板的侦测方法，其中，所述侦测方法包括：
    由至少一个光传感器检测液晶显示面板的亮度，并将检测到的亮度转换成第一电压；
    由运算放大器将所述第一电压按预定比例进行放大以产生第二电压；
    由比较电路通过将运算放大器产生的第二电压与多个参考电压进行比较以产生使得液晶显示面板的电源被关闭的控制信号。
  7. 如权利要求6所述的侦测方法，其中，由比较电路通过将运算放大器产生的第二电压与多个参考电压进行比较以产生使得液晶显示面板的电源被关闭的控制信号的步骤包括：
    由第一比较器将所述第二电压与第一参考电压进行比较，由第一开关响应 于第一比较器输出的第一控制信号导通或截止；
    由第二比较器将所述第二电压与第二参考电压进行比较，由第二开关响应于第二比较器输出的第二控制信号导通或截止，
    其中，第二参考电压大于第一参考电压，并且当第一控制信号控制第一开关导通或者第二控制信号控制第二开关导通时，液晶显示面板的电源根据第一开关或第二开关的导通而被关闭。
  8. 如权利要求6所述的侦测方法，其中，由比较电路通过将运算放大器产生的第二电压与多个参考电压进行比较以产生使得液晶显示面板的电源被关闭的控制信号的步骤包括：
    由第三比较器将所述第二电压与第三参考电压进行比较；
    由第四比较器将所述第二电压与第四参考电压进行比较；
    由或电路对第三比较器输出的第三控制信号和第四比较器输出的第四控制信号执行或运算，从而产生第五控制信号；
    由第三开关响应于通过或电路输出的第三控制信号或第三控制信号而导通或截止，
    其中，第四参考电压大于第三参考电压，并且当第五控制信号控制第三开关导通时，液晶显示面板的电源根据第三开关的导通而被关闭。
  9. 如权利要求7所述的侦测方法，其中，当所述第二电压大于所述第一参考电压时，由第一比较器输出的第一控制信号控制第一开关导通，当所述第二电压小于所述第一参考电压时，由第一比较器输出的第一控制信号控制第一开关截止；
    当所述第二电压小于所述第二参考电压时，由第二比较器输出的第二控制信号控制第二开关导通，当所述第二电压大于所述第二参考电压时，由第二比较器输出的第二控制信号控制第二开关截止。
  10. 如权利要求8所述的侦测方法，其中，当所述第二电压大于所述第三 参考电压时，由第三比较器输出的第三控制信号控制第三开关导通，当所述第二电压小于所述第三参考电压时，由第三比较器输出的第三控制信号控制第三开关截止；
    当所述第二电压小于所述第四参考电压时，由第四比较器输出的第四控制信号控制第三开关导通，当所述第二电压大于所述第四参考电压时，由第四比较器输出的第四控制信号控制第三开关截止。
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