WO2023216602A1 - 控制电路、控制方法和显示装置 - Google Patents

控制电路、控制方法和显示装置 Download PDF

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Publication number
WO2023216602A1
WO2023216602A1 PCT/CN2022/140897 CN2022140897W WO2023216602A1 WO 2023216602 A1 WO2023216602 A1 WO 2023216602A1 CN 2022140897 W CN2022140897 W CN 2022140897W WO 2023216602 A1 WO2023216602 A1 WO 2023216602A1
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WIPO (PCT)
Prior art keywords
feedback
switch
signal
module
constant current
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PCT/CN2022/140897
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English (en)
French (fr)
Inventor
刘洪海
阮永鑫
于德伟
郑浩旋
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惠科股份有限公司
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Priority to EP22930140.3A priority Critical patent/EP4297004A1/en
Publication of WO2023216602A1 publication Critical patent/WO2023216602A1/zh

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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
    • G09G3/3406—Control of illumination source
    • 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
    • G09G3/3406—Control of illumination source
    • G09G3/3413—Details of control of colour illumination sources
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
    • Y02B20/30—Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]

Definitions

  • the present application relates to the field of display driving technology, and in particular to a control circuit, a control method and a display device.
  • the lighting of the light-emitting diodes is controlled through PWM (Pulse width modulation) pulse width modulation.
  • the current PWM signal has a low-level signal setting.
  • the low-level signal of the PWM signal is converted into a current signal, the current value is lower.
  • the low current causes the amplitude of the voltage fluctuation at the feedback terminal of the light-emitting diode to become larger. Large fluctuations in voltage cause the brightness of the light-emitting diodes to fluctuate, causing the problem of the light-emitting diodes constantly flickering.
  • This application provides a technical solution for reducing the continuous flickering of light-emitting diodes when using low-level PWM signals.
  • the application provides a control circuit, including a sampling module, the sampling module is used to collect a level signal corresponding to the pulse width modulation signal, and the control circuit also includes:
  • the switching module can switch between the first mode and the second mode based on the relationship between the level signal and the preset threshold; in the first mode, the switching module can control the signal in the signal feedback terminal. Each feedback point is independent of each other; in the second mode, the switching module can control each feedback point in the signal feedback terminal to be related to each other; and
  • a working power supply is connected to the sampling module and the switching module, and the working power supply supplies power to the sampling module and the switching module.
  • the application also provides a control method, the control method includes:
  • the control sampling module collects the level signal corresponding to the pulse width modulation signal, and transmits the level signal to the switching module, wherein one end of the switching module is connected to the sampling module, and the other end is connected to at least one set of signal feedback terminals , the signal feedback end includes at least two feedback points, the feedback points are used to connect with the light-emitting unit, and the switching module and the sampling module are both connected to the working power supply;
  • the switching module is controlled to receive the level signal, and based on the relationship between the level signal and the preset threshold, the switching module is controlled to switch between the first mode and the second mode, wherein in the third In one mode, the switching module can control each feedback point in the signal feedback terminal to be independent of each other. In the second mode, the switching module can control each feedback point in the signal feedback terminal to be associated with each other.
  • the present application also provides a display device, including a plurality of light-emitting units and the control circuit as described above, and the feedback points are connected to the light-emitting units in one-to-one correspondence.
  • the working power supply provides power for the operation of the sampling module and the switching module, and the sampling module sends the collected level signal to the switching module, where the level signal corresponds to the pulse width modulation signal.
  • the switching module can switch between the first mode and the second mode according to the driving level signal. In the first mode, each feedback point is independent of each other, and the current connected to each feedback point is also independent. In the second mode, the two feedback points will be related to each other. At this time, the two feedback points are connected under the same line. When the signal is low, the switching module switches to the second mode, which is equivalent to merging two low-current lines together, thus increasing the amount of current in the line. By increasing the current, the relative fluctuation of the voltage is reduced, the brightness of the light-emitting diode becomes stable, and the brightness does not change high or low. Therefore, this technical solution can effectively reduce the brightness flicker of the light-emitting diode.
  • Figure 1 is a schematic connection diagram of the first embodiment of the present application.
  • FIG. 2 is a schematic diagram of the connection of the light-emitting unit in FIG. 1 in this application.
  • Figure 3 is a circuit diagram of the first embodiment of the present application.
  • Figure 4 is a flow chart of the control method in the second embodiment of the present application.
  • FIG. 5 is a specific flow chart of step S20 in the second embodiment of the present application.
  • Figure 6 is a schematic connection diagram of the third embodiment of the present application.
  • Example embodiments will now be described more fully with reference to the accompanying drawings.
  • Example embodiments may, however, be embodied in various forms and should not be construed as limited to the examples set forth herein; rather, these example embodiments are provided so that this description will be thorough and complete and will convey the concepts of the example embodiments fully communicated to those skilled in the art.
  • the drawings are merely schematic illustrations of the present application and are not necessarily drawn to scale.
  • the same reference numerals in the drawings represent the same or similar parts, and thus their repeated description will be omitted.
  • the control circuit includes a sampling module 1, a switching module 2 and a working power supply 3.
  • the working power supply 3 is connected to the sampling module 1 and the switching module 2, and the working power supply 3 supplies power to the sampling module 1 and the switching module 2.
  • the working power supply 3 is the DC power supply VCC.
  • the power supply of the working power supply 3 ensures that various electronic components in the sampling module 1 and the switching module 2 can operate and work normally.
  • the voltage of the working power supply 3 can be 5 volts or 12 volts. .
  • the sampling module 1 is used to collect the level signal corresponding to the pulse width modulation signal.
  • the pulse width modulation signal is also referred to as the PWM signal for short.
  • One end of the switching module 2 is connected to the sampling module 1, and the other end is connected to at least one set of signal feedback terminals 4.
  • the signal feedback terminals 4 include at least two feedback points.
  • each group of signal feedback terminals 4 there can be multiple signal feedback terminals 4, not limited to one, such as two or three. Moreover, the number of feedback points in each group of signal feedback terminals 4 is not limited to two, and may be more than three.
  • the feedback point is used to connect with the lighting unit 5. Generally speaking, one end of the light-emitting unit 5 is connected to the feedback point, and the other end is connected to the negative electrode 6 of the backlight connector. By turning on the switching module 2, the lighting unit 5 can be turned on or off.
  • the light-emitting unit 5 can be an LED (light-emitting diode, light-emitting diode), an OLED (Organic Light-Emitting Diode, an organic light-emitting diode), or an AMOLED (Active-matrix organic light-emitting diode, an active matrix organic light-emitting diode). diode) etc.
  • the light-emitting unit 5 connected to the feedback point in this embodiment is not limited to one, and may be a light string composed of multiple light-emitting units 5 .
  • the switching module 2 can switch between the first mode and the second mode based on the relationship between the level signal and the preset threshold; in the first mode, the switching module 2 can control each feedback point in the signal feedback terminal 4 to be independent of each other. ; Each feedback point is independent of each other, which means that the current or voltage between each other is separate, and each has an independent circulation line. In the second mode, the switching module 2 can control the feedback points in the signal feedback terminal 4 to be related to each other. Interrelation can be understood as connecting various feedback points together and sharing a common circulation line.
  • the preset threshold can be understood as the basis for judging the level of the level signal.
  • the size of the preset threshold can be adjusted, and generally the range of the preset threshold is between 0.1% and 10%.
  • the preset threshold can be a specific value or a range value. For example, when the preset threshold is 5%, 5% is used as the limit to determine whether the switching module 2 switches to the first mode or the second mode.
  • the preset thresholds can also be 0.1%, 0.3%, 0.5%, 1%, 2%, 3%, 4%, 6%, 7%, 8%, 9%, 10%, etc.
  • the working power supply 3 provides power for the operation of the sampling module 1 and the switching module 2, and the sampling module 1 sends the collected level signal to the switching module 2, where the level signal and pulse width corresponding to the modulated signal.
  • the switching module 2 can switch between the first mode and the second mode according to the driving level signal. In the first mode, each feedback point is independent of each other, and the current connected to each feedback point is also independently supplied through different lines. In the second mode, the two feedback points will be related to each other. At this time, the two feedback points are connected under the same line. When the signal is low, the switching module 2 switches to the second mode, which is equivalent to merging two low-current lines together, thereby increasing the amount of current in the line. By increasing the current, the relative fluctuation of the voltage is reduced, the brightness of the light-emitting diode becomes stable, and the brightness does not change high or low. Therefore, this technical solution can effectively reduce the brightness flicker of the light-emitting diode.
  • the switching module 2 includes at least one set of constant current source sub-modules 21 and at least one set of control switch sub-modules 22.
  • the constant current source sub-module 21, the control switch sub-module 22 and the signal feedback terminal 4 are arranged in one-to-one correspondence; wherein, the control switch sub-module 21 Module 22 includes a first switch K1 and a second switch K2;
  • the constant current source sub-module 21 includes at least two constant current sources.
  • the constant current source has a power terminal, an input terminal and an output terminal.
  • the input terminal of the constant current source is connected to the sampling module 1 through an input line.
  • the power terminal of the constant current source is connected to the sampling module 1 through an input line.
  • a power line is connected to the working power supply 3, and the output end of the constant current source is connected to a feedback point of the signal feedback end 4 through a feedback line; the constant current source provides stable DC current, and the light-emitting unit 5 can continue to operate through the stable DC current.
  • the power terminal of the constant current source includes the positive pole of the power supply and the negative pole of the power supply.
  • the positive pole of the power supply is connected to the working power supply 3, and the negative pole of the power supply is connected to the ground.
  • the multiple power lines there is one power line that is not set with the first switch K1, and the remaining power lines are set with the first switch K1; in the signal feedback terminal 4, each feedback line connected to each feedback point is connected through a second switch; There may be one second switch K2, or there may be multiple second switches K2.
  • the plurality of second switches K2 connect each feedback line.
  • the working power supply 3 In a constant current source that is not connected to the power line of the first switch K1, the working power supply 3 always remains connected to it. In this way, when the first switch K1 in the remaining power lines is turned off, the second switch K2 is turned on. In this way, the constant current sources in the constant current source sub-module 21 are all connected to the working source through one line.
  • the first switch K1 is closed and the second switch K2 is opened. If multiple first switches K1 and multiple second switches K2 are provided, then the first switch K1 is in a closed state, and the second switch K2 is in an open state; in the second mode, the first switch K1 is open, and the second switch K2 is closed. It can also be seen that if there are multiple first switches K1 and multiple second switches K2, then the first switches K1 are all in the open state and the second switches K2 are all in the closed state.
  • multiple constant current source sub-modules 21 are provided, and the multiple constant current source sub-modules 21 are arranged in parallel.
  • Each constant current source sub-module 21 is connected to a group of signal feedback terminals 4 . It can be seen from this that there are multiple signal feedback terminals 4 provided.
  • there are multiple control switch sub-modules 22 and each group of constant current sources is connected to a group of control switch sub-modules 22 .
  • Each group of control switch sub-modules 22 controls the connection state between each group of signal feedback terminals 4 and the constant current source sub-module 21 .
  • two constant current source sub-modules 21 can be provided, but it is not limited to this, and more constant current source sub-modules 21 can also be provided.
  • the switching module 2 also includes a control unit 23.
  • the control unit 23 is connected to the control switch sub-module 22.
  • the control unit 23 is used to control the closing or opening of the first switch K1 and the closing or opening of the second switch K2.
  • the control unit 23 can be understood as an MCU (Microcontroller Unit).
  • the MCU is provided with a memory, and the preset threshold value can be stored in the memory.
  • the MCU also includes a processor. When the switching module 2 is working, the processor retrieves the preset threshold saved in the memory.
  • the processor compares the duty cycle (Duty Ratio) in the received PWM signal with the preset threshold in the memory. Compare and perform subsequent control operations based on the size comparison results between the two.
  • the duty cycle in the PWM signal corresponds to the level signal collected by the sampling module 1.
  • the duty cycle is the ratio of the power-on time and the total time in a pulse signal cycle. What we can know is that the lower the duty cycle, the shorter the power-on time.
  • the level signal collected by sampling module 1 is converted from the duty cycle. When the duty cycle is low, the level signal is low level; when the duty cycle is high, the level signal is high level.
  • the constant current source includes a first operational amplifier U1, a first field effect transistor Q1 and a first resistor R1.
  • the positive terminal of the power supply of the first operational amplifier U1 is connected to the working power supply 3, and the negative terminal of the power supply of the first operational amplifier U1 is connected to the ground.
  • the positive signal input terminal of the first operational amplifier U1 is connected to the sampling module 1, the negative signal input terminal of the first operational amplifier U1 is connected to the first resistor R1, the other end of the first resistor R1 is grounded, and the signal output terminal of the first operational amplifier U1 is connected to the first resistor R1.
  • Field effect transistor Q1, one end of the first field effect transistor Q1 is connected to the first resistor R1, and the other end of the first field effect transistor Q1 is connected to a feedback point.
  • one constant current source sub-module 21 includes two constant current sources
  • one constant current source includes the first operational amplifier U1 and the first field effect transistor.
  • Q1 one end of the first operational amplifier U1 and the first field effect transistor Q1 are all connected to the first resistor R1.
  • the other constant current source includes a third operational amplifier U3 and a third field effect transistor Q3.
  • One ends of the third operational amplifier U3 and the third field effect transistor Q3 are both connected to the fourth resistor R4.
  • One constant current source includes a fourth operational amplifier U4 and a fourth field effect transistor Q4, and one end of the fourth operational amplifier U4 and the fourth field effect transistor Q4. Both are connected to the fifth resistor R5.
  • the other constant current source includes a fifth operational amplifier U5 and a fifth field effect transistor Q5.
  • One end of the fifth operational amplifier U5 and the fifth field effect transistor Q5 is connected to the sixth resistor R6.
  • the resistance values of the first resistor R1, the fourth resistor R4, the fifth resistor R5 and the sixth resistor R6 are equal.
  • the constant current source sub-module 21 is also connected in parallel with a seventh resistor R7, and the resistance of the seventh resistor R7 can also be equal to the resistance of the first resistor R1.
  • field effect tube can be understood as MOS tube, which is the abbreviation of MOSFET.
  • MOSFE Metal-Oxide Semiconductor Field Effect Transistor referred to as Metal-Oxide-Semiconductor Field-Effect Transistor, MOSFET. It is generally a metal-oxide-semiconductor field effect transistor, or a metal-insulator-semiconductor.
  • G gate; S: source; D: drain. The source and drain of the MOS tube can be swapped.
  • the sampling module 1 includes a second operational amplifier U2, a first sampling point A and a second sampling point B.
  • the first sampling point A is connected to the positive signal input of the second operational amplifier U2, and the second sampling point B is connected to the second operational amplifier U2.
  • the second field effect transistor Q2 is disposed between the negative signal input terminal of the second operational amplifier U2 and the second sampling point B.
  • the field effect transistor is equivalent to a switch in this embodiment. When the level is low, the second field effect transistor Q2 is turned off. When the level is high, the second field effect transistor Q2 is turned on. It can be seen that at low level, the second field effect transistor Q2 is turned off.
  • the sampling module 1 also includes a second resistor R2 and a third resistor R3.
  • One end of the second field effect transistor Q2 is connected to the second resistor R2, and the other end of the second resistor R2 is grounded; one end of the third resistor R3 is connected to the second resistor R2.
  • the signal input of the operational amplifier U2 is the negative electrode, the other end of the third resistor R3 is connected to the ground, and the line composed of the second field effect transistor Q2 and the second resistor R2 is connected in parallel with the third resistor R3.
  • the second field effect transistor Q2 is turned off, and the current flows through the second resistor R2 and the third resistor R3.
  • the series resistance of the second resistor R2 and the third resistor R3 becomes larger. It can be seen that the current flowing to the second operational amplifier U2 changes. Small.
  • the second field effect transistor Q2 is closed, and current flows through the second field effect transistor Q2.
  • the second resistor R2 and the third resistor R3 are connected in parallel, and the resistance becomes smaller. It can be seen that the current flowing to the second operational amplifier U2 increases.
  • the positive signal input terminal of the operational amplifier can be understood as the positive input terminal
  • the negative signal input terminal of the operational amplifier can also be understood as the inverting input terminal.
  • the sampling module 1 also includes a sixth field effect transistor Q6 and a seventh field effect transistor Q7.
  • the sixth field effect transistor Q6 and the seventh field effect transistor Q7 are both connected to the working power supply 3.
  • the sixth field effect transistor Q6 and the seventh field effect transistor Q7 are connected to the working power supply 3.
  • the seventh field effect transistor Q7 is connected in parallel.
  • the other ends of the sixth field effect transistor Q6 and the seventh field effect transistor Q7 are connected to the eighth field effect transistor Q8.
  • the eighth field effect transistor Q8 is connected to the output end of the second operational amplifier U2. Furthermore, it should be noted that the first sampling point A and the second sampling point B are the same sampling point and two lines extending from the same point.
  • This application also provides a control method, which includes:
  • Step S10 control the sampling module to collect the level signal corresponding to the pulse width modulation signal, and transmit the level signal to the switching module.
  • One end of the switching module is connected to the sampling module, and the other end is connected to at least one set of signal feedback terminals.
  • the signal feedback The terminal includes at least two feedback points. The feedback points are used to connect to the light-emitting unit.
  • Both the switching module and the sampling module are connected to the working power supply.
  • the working power supply is a DC power supply. Through the power supply of the working power supply, various electronic components in the sampling module and the switching module are ensured. The component can operate and work normally, and the voltage of the working power supply can be 5 volts or 12 volts.
  • the sampling module is used to collect the level signal corresponding to the pulse width modulation signal.
  • the pulse width modulation signal is also referred to as PWM signal for short.
  • Step S20 control the switching module to receive the level signal, and based on the relationship between the level signal and the preset threshold, control the switching module to switch between the first mode and the second mode, wherein in the first mode, the switching module can Each feedback point in the control signal feedback terminal is independent of each other. In the second mode, the switching module can control each feedback point in the signal feedback terminal to be related to each other. Interrelation can be understood as connecting various feedback points together and sharing a common circulation line.
  • the preset threshold can be understood as the basis for judging the level of the level signal.
  • the size of the preset threshold can be adjusted, and generally the range of the preset threshold is between 0.1% and 10%. And the preset threshold can be a specific value or a range value.
  • the preset threshold when the preset threshold is 5%, 5% is used as the limit to determine whether the switching module switches to the first mode or the second mode.
  • the preset thresholds can also be 0.1%, 0.3%, 0.5%, 1%, 2%, 3%, 4%, 6%, 7%, 8%, 9%, 10%, etc.
  • the step of controlling the switching module to switch between the first mode and the second mode includes:
  • Step S210 Obtain the duty cycle representing the level signal from the pulse width modulation signal; the duty cycle is the ratio of the power-on time and the total time within a pulse signal period. What we can know is that the lower the duty cycle, the shorter the power-on time.
  • the level signal collected by the sampling module is converted from the duty cycle. When the duty cycle is low, the level signal is low level; when the duty cycle is high, the level signal is high level.
  • Step S220 Compare the duty cycle with the preset threshold; compare the magnitudes of the two, and output a switching instruction based on the comparison result between the two.
  • Step S230 When the duty cycle is less than the preset threshold, a first switching instruction is output.
  • the switching module is controlled to switch to the first mode; in the first mode, the switching module can control each of the signal feedback terminals.
  • Feedback points are independent of each other; each feedback point is independent of each other, which means that the current or voltage between them is separated, and each has an independent circulation line.
  • Step S240 When the duty cycle is greater than or equal to the preset threshold, a second switching instruction is output, and the switching module is controlled to switch to the second mode according to the second switching instruction.
  • the switching module can control the feedback points in the signal feedback terminal to be related to each other. Interrelation can be understood as connecting various feedback points together and sharing a common circulation line.
  • each feedback point is independent of each other, and the current connected to each feedback point is also independent.
  • the two feedback points will be related to each other. At this time, the two feedback points are connected under the same line.
  • the switching module switches to the second mode, which is equivalent to merging two low-current lines together, thus increasing the amount of current in the line.
  • the present application also provides a display device.
  • the display device includes a plurality of light-emitting units 5 and a control circuit.
  • the feedback points 41 are connected to the light-emitting units 5 in one-to-one correspondence.
  • the lighting of the light-emitting unit 5 is controlled by the switching module 2 in the control circuit.
  • the display device includes but is not limited to a liquid crystal display panel, an organic light-emitting diode display panel, a field emission display panel, a plasma display panel, and a curved panel.
  • the liquid crystal panel includes a thin film transistor liquid crystal display panel, a TN panel (TN panel) Twisted Nematic), VA panel (VA stands for wide viewing angle), IPS panel (IPS stands for In-Plane Switching, plane switching), etc.
  • the embodiments of the display device of the present application include all the technical solutions of all the embodiments of the above-mentioned control circuit, and the technical effects achieved are exactly the same, and will not be described again here.

Abstract

一种控制电路、控制方法和显示装置。控制电路包括采样模块（1）、切换模块（2）和工作电源（3），采样模块（1）用于采集与脉冲宽度调制信号对应的电平信号，切换模块（2）的一端连接采样模块（1），另一端连接至少一组信号反馈端（4），信号反馈端（4）包括至少两个反馈点（41），反馈点（41）用于与发光单元（5）连接，切换模块（2）能够基于电平信号与预设阈值之间的关系在第一模式和第二模式之间切换；在第一模式下，切换模块（2）能够控制信号反馈端（4）内的各反馈点（41）相互独立；在第二模式下，切换模块（2）能够控制信号反馈端（4）内的各反馈点（41）相互关联；工作电源（3）连接采样模块（1）和切换模块（2），工作电源（3）为采样模块（1）和切换模块（2）供电。

Description

控制电路、控制方法和显示装置
本申请要求于2022年5月9日提交中国专利局，申请号为CN 202210498041.2，申请名称为“控制电路、控制方法和显示装置”的中国专利申请的优先权，其全部内容通过引用结合在本申请中。
技术领域
本申请涉及显示驱动技术领域，特别涉及一种控制电路、控制方法和显示装置。
背景技术
在显示面板的背光源(Back Light)中，通过PWM(Pulse width modulation)脉冲宽度调制来控制发光二极管的点亮。但是，目前的PWM信号出现了低电平信号的设置。低电平信号的PWM信号转化为电流的信号时，电流值较低。低电流导致在发光二极管的反馈端的电压波动的幅度变大。而电压的较大幅度波动导致发光二极管的亮度高低起伏，出现发光二极管不断闪烁的问题。
在所述背景技术部分公开的上述信息仅用于加强主要作用于减少对本申请的背景的理解，因此它可以包括不构成对本领域普通技术人员已知的现有技术的信息。
申请内容
本申请提供一种低电平信号的PWM信号时，减少发光二极管不断闪烁的技术方案。
根据本申请的第一方面，本申请提供一种控制电路，包括采样模块，所述采样模块用于采集与脉冲宽度调制信号对应的电平信号，所述控制电路还包括：
切换模块，所述切换模块的一端连接所述采样模块，另一端连接至少一组信号反馈端，所述信号反馈端包括至少两个反馈点，所述反馈点用于与发光单元连接，所述切换模块能够基于所述电平信号与预设阈值之间的关系在第一模式和第二模式之间切换；在所述第一模式下，所述切换模块能够控制所述信号反馈端内的各反馈点相互独立；在所述第二模式下，所述切换模块能够控制所述信号反馈端内的各反馈点相互关联；以及
工作电源，所述工作电源连接所述采样模块和所述切换模块，所述工作电源为所述采样模块和所述切换模块供电。
根据本申请的第二方面，本申请还提供一种控制方法，所述控制方法包括：
控制采样模块采集与脉冲宽度调制信号对应的电平信号，并将所述电平信号传输给切换模块，其中，所述切换模块的一端连接所述采样模块，另一端连接至少一组信号反馈端， 所述信号反馈端包括至少两个反馈点，所述反馈点用于与发光单元连接，所述切换模块和所述采样模块均连接工作电源；
控制所述切换模块接收所述电平信号，基于所述电平信号与预设阈值之间的关系，控制所述切换模块在第一模式和第二模式之间切换，其中，在所述第一模式下，所述切换模块能够控制所述信号反馈端内的各反馈点相互独立，在所述第二模式下，所述切换模块能够控制所述信号反馈端内的各反馈点相互关联。
根据本申请的第三方面，本申请还提供一种显示装置，包括多个发光单元和如上文所述的控制电路，所述反馈点与所述发光单元一一对应连接。
本申请的技术方案中，工作电源为采样模块和切换模块的运转提供电力，采样模块将采集到的电平信号发送给切换模块，其中，所述电平信号和脉冲宽度调制信号相对应。切换模块能够依据驱动电平信号在第一模式和第二模式之间切换。在第一模式下，各个反馈点是相互独立的，此时连接每个反馈点的电流也是独立的。在第二模式下，两个反馈点会相互关联，此时，该两个反馈点连接在同一线路下。在低电平信号时，切换模块切换到第二模式，相当于将两个低电流的线路合并到了一起，由此，增加了该线路中的电流量。通过电流的增加，电压的相对波动减小，发光二极管的亮度趋于稳定，亮度不会出现高低变化。由此本技术方案能够有效减少发光二极管的亮度闪烁。
应当理解的是，以上的一般描述和后文的细节描述仅是示例性的，并不能限制本申请。
附图说明
此处的附图被并入说明书中并构成本说明书的一部分，示出了符合本申请的实施例，并于说明书一起用于解释本申请的原理。
为了使本公开的内容更容易被清楚的理解，下面根据本公开的具体实施例并结合附图，对本公开作进一步详细的说明，其中：
图1是本申请中第一实施例的连接示意图。
图2是本申请中图1中连接发光单元的连接示意图。
图3是本申请中第一实施例的电路图。
图4是本申请中第二实施例的控制方法流程图。
图5是本申请中第二实施例中步骤S20的具体流程图。
图6是本申请中第三实施例连接示意图。
具体实施方式
尽管本申请可以容易地表现为不同形式的实施方式，但在附图中示出并且在本说明书中将详细说明的仅仅是其中一些具体实施方式，同时可以理解的是本说明书应视为是本申请原理的示范性说明，而并非旨在将本申请限制到在此所说明的那样。
由此，本说明书中所指出的一个特征将用于说明本申请的一个实施方式的其中一个特征，而不是暗示本申请的每个实施方式必须具有所说明的特征。此外，应当注意的是本说明书描述了许多特征。尽管某些特征可以组合在一起以示出可能的系统设计，但是这些特征也可用于其他的未明确说明的组合。由此，除非另有说明，所说明的组合并非旨在限制。
在附图所示的实施方式中，方向的指示(诸如上、下、左、右、前和后)用于解释本申请的各种元件的结构和运动不是绝对的而是相对的。当这些元件处于附图所示的位置时，这些说明是合适的。如果这些元件的位置的说明发生改变时，则这些方向的指示也相应地改变。
现在将参考附图更全面地描述示例实施方式。然而，示例实施方式能够以多种形式实施，且不应被理解为限于在此阐述的范例；相反，提供这些示例实施方式使得本申请的描述将更加全面和完整，并将示例实施方式的构思全面地传达给本领域的技术人员。附图仅为本申请的示意性图解，并非一定是按比例绘制。图中相同的附图标记表示相同或类似的部分，因而将省略对它们的重复描述。
以下结合本说明书的附图，对本申请的较佳实施方式予以进一步地详尽阐述。
实施例一
参阅图1和图2所示，本申请提供一种控制电路，控制电路包括采样模块1、切换模块2和工作电源3。工作电源3连接采样模块1和切换模块2，工作电源3为采样模块1和切换模块2供电。工作电源3为直流电源VCC，通过工作电源3的供电，保证采样模块1和切换模块2中的各种电子元件能够运转、正常工作，工作电源3的电压可以是5伏，也可以是12伏。采样模块1用于采集与脉冲宽度调制信号对应的电平信号，脉冲宽度调制信号也简称为PWM信号。切换模块2的一端连接采样模块1，另一端连接至少一组信号反馈端4，信号反馈端4包括至少两个反馈点。
这里需要说明的是，信号反馈端4可以有多个，不限于一个，比如两个或者三个等。并且，每组信号反馈端4中反馈点的数量也不限于两个，可以是三个以上。反馈点用于与发光单元5连接。一般来说，发光单元5一端连接反馈点，另一端连接背光 连接器负极6。通过切换模块2的接通，可以实现发光单元5的点亮或者关闭。发光单元5可以为LED(light-emitting diode，发光二极管)，还可以是OLED(Organic Light-Emitting Diode，有机发光二极管)，或者是AMOLED(Active-matrix organic light-emitting diode，有源矩阵有机发光二极管)等。
另外，本实施例中连接反馈点的发光单元5不限于一个，可以是多个发光单元5组成的灯串。切换模块2能够基于电平信号与预设阈值之间的关系在第一模式和第二模式之间切换；在第一模式下，切换模块2能够控制信号反馈端4内的各反馈点相互独立；各反馈点相互独立是指彼此之间的电流或者电压是分开的，各自拥有独立的流通线路。在第二模式下，切换模块2能够控制信号反馈端4内的各反馈点相互关联。相互关联可以理解为将各个反馈点连接在一起，公用一个流通线路。预设阈值可以理解为是对电平信号中电平的高低进行判断的依据。预设阈值的大小可以调整，一般预设阈值的范围在0.1％-10％之间。并且预设阈值可以是其中的具体值，也可以是范围值。例如预设阈值为5％时，以5％为界限，判断切换模块2是切换到第一模式还是第二模式。除此之外，预设阈值还可以是0.1％、0.3％、0.5％、1％、2％、3％、4％、6％、7％、8％、9％、10％等。
本实施例的技术方案中，工作电源3为采样模块1和切换模块2的运转提供电力，采样模块1将采集到的电平信号发送给切换模块2，其中，所述电平信号和脉冲宽度调制信号相对应。切换模块2能够依据驱动电平信号在第一模式和第二模式之间切换。在第一模式下，各个反馈点是相互独立的，此时连接每个反馈点的电流也是通过不同线路独立供给的。在第二模式下，两个反馈点会相互关联，此时，该两个反馈点连接在同一线路下。在低电平信号时，切换模块2切换到第二模式，相当于将两个低电流的线路合并到了一起，由此，增加了该线路中的电流量。通过电流的增加，电压的相对波动减小，发光二极管的亮度趋于稳定，亮度不会出现高低变化。由此本技术方案能够有效减少发光二极管的亮度闪烁。
参阅图3所示，为了有效完成切换模块2的切换工作。切换模块2包括至少一组恒流源子模块21和至少一组控制开关子模块22，恒流源子模块21、控制开关子模块22及信号反馈端4一一对应设置；其中，控制开关子模块22包括第一开关K1和第二开关K2；
恒流源子模块21包括至少两个恒流源，恒流源具有电源端、输入端和输出端，恒流源的输入端通过一条输入线路与采样模块1连接，恒流源的电源端通过一条电源 线路与工作电源3连接，恒流源的输出端通过一条反馈线路与信号反馈端4的一个反馈点连接；恒流源提供稳定的直流电流，通过稳定的直流电流发光单元5能够持续的被点亮，不会出现关闭、点亮到再关闭、再点亮的一个过程。在显示屏幕上，也就不会出现闪烁的条纹，从而能够更好的显示画面。恒流源的电源端包括电源正极和电源负极，电源正极连接工作电源3，电源负极接地。
在多条电源线路中：存在一条电源线路未设置第一开关K1，剩余其他电源线路设置第一开关K1；在信号反馈端4中，与各反馈点连接的各反馈线路通过第二开关连接；第二开关K2可以设置有一个，也可以设置有多个。在第二开关K2设置有多个时，多个第二开关K2连通各反馈线路。在没有设置第一开关K1的电源线路连接的恒流源中，工作电源3始终保持与其连接。这样在剩余其他电源线路中的第一开关K1断开的情况下，第二开关K2闭合，如此，恒流源子模块21中的恒流源均通过一条线路连通工作源。
具体地，切换模块2在工作过程中，第一模式下，第一开关K1闭合，第二开关K2断开，如果设置有多个第一开关K1和多个第二开关K2，则第一开关K1均处于闭合状态，第二开关K2均处于断开；第二模式中，第一开关K1断开，第二开关K2闭合。同样可知，如果设置有多个第一开关K1和多个第二开关K2，则第一开关K1均处于断开状态，第二开关K2均处于闭合状态。
在其中一个方面，恒流源子模块21设置有多个，多个恒流源子模块21之间并联设置，每一恒流源子模块21连接一组信号反馈端4。由此可知信号反馈端4设置有多个。并且控制开关子模块22也设置有多个，每一组恒流源连接一组控制开关子模块22。各组控制开关子模块22控制每组信号反馈端4和恒流源子模块21之间的连接状态。如图3所示，恒流源子模块21可以设置两个，但不限于此，也可设置更多个。
在其中一个方面，切换模块2还包括控制单元23，控制单元23连接控制开关子模块22，控制单元23用于控制第一开关K1的闭合或断开、以及第二开关K2的闭合或断开。控制单元23可以理解为MCU(Microcontroller Unit，微控制单元)，MCU中设置有存储器，预设阈值可以保存在存储器中。MCU还包括处理器，在切换模块2工作时，处理器调取存储器中保存的预设阈值，处理器将接收到的PWM信号中的占空比(Duty Ratio)和存储器中的预设阈值进行对比，依据两者之间的大小对比结果进行后续控制作业。该PWM信号中的占空比和采样模块1采集到的电平信号是相对 应的。其中，占空比是在一个脉冲信号周期内通电时间和总时间的比值。可以知道的是，占空比越低，通电的时间越短。采样模块1采集到的电平信号是占空比转化而来。占空比低时，电平信号就是低电平，占空比高时，电平信号就是高电平。
在其中一个方面，恒流源包括第一运算放大器U1、第一场效应管Q1和第一电阻R1，第一运算放大器U1的电源正极连接工作电源3，第一运算放大器U1的电源负极接地，第一运算放大器U1的信号输入正极连接采样模块1，第一运算放大器U1的信号输入负极连接第一电阻R1，第一电阻R1的另一端接地，第一运算放大器U1的信号输出端连接第一场效应管Q1，第一场效应管Q1的一端连接第一电阻R1，第一场效应管Q1的另一端连接一个反馈点。
举例说明，比如说，恒流源子模块21设置有两个，其中一个恒流源子模块21包括有两个恒流源，一个恒流源中包括第一运算放大器U1和第一场效应管Q1，第一运算放大器U1和第一场效应管Q1的一端均连接第一电阻R1。另一个恒流源中包括第三运算放大器U3和第三场效应管Q3，第三运算放大器U3和第三场效应管Q3的一端均连接第四电阻R4。在第一开关K1闭合，第二开关K2打开时，这两个恒流源是并联的。另外一个恒流源子模块21也包括有两个恒流源，一个恒流源中包括第四运算放大器U4和第四场效应管Q4，第四运算放大器U4和第四场效应管Q4的一端均连接第五电阻R5。另一个恒流源中包括第五运算放大器U5和第五场效应管Q5，第五运算放大器U5和第五场效应管Q5的一端均连接第六电阻R6。一般情况下，第一电阻R1、第四电阻R4、第五电阻R5和第六电阻R6的阻值大小相等。另外，恒流源子模块21还并联一个第七电阻R7，第七电阻R7的阻值也可以等于第一电阻R1的阻值。其中场效应管可以理解为MOS管，是MOSFET的缩写。MOSFE金属-氧化物半导体场效应晶体管，简称金氧半场效晶体管(Metal-Oxide-Semiconductor Field-Effect Transistor，MOSFET)。一般是金属(metal)-氧化物(oxide)-半导体(semiconductor)场效应晶体管，或者称是金属-绝缘体(insulator)-半导体。G：gate栅极；S：source源极；D：drain漏极。MOS管的source(源极)和drain(漏极)是可以对调的。
在其中一个方面，采样模块1包括第二运算放大器U2、第一采样点A和第二采样点B，第一采样点A连接第二运算放大器U2的信号输入正极，第二采样点B连接第二运算放大器U2的信号输入负极，第二运算放大器U2的信号输入负极和第二采样点B之间设置第二场效应管Q2。场效应管在本实施例中相当于一个开关，在低电 平时，第二场效应管Q2是断开的，在高电平时，第二场效应管Q2是导通的。由此可知，在低电平时，第二场效应管Q2是断开。进一步地，采样模块1还包括第二电阻R2和第三电阻R3，第二场效应管Q2的一端连接第二电阻R2，第二电阻R2的另一端接地；第三电阻R3的一端连接第二运算放大器U2的信号输入负极，第三电阻R3的另一端接地，第二场效应管Q2和第二电阻R2组成的线路与第三电阻R3并联。低电平时，第二场效应管Q2断开，电流流经第二电阻R2和第三电阻R3，第二电阻R2和第三电阻R3串联电阻变大，可知流向第二运算放大器U2的电流变小。在高电平时，第二场效应管Q2闭合，电流流经第二场效应管Q2，此时，第二电阻R2和第三电阻R3并联，电阻变小。可知流向第二运算放大器U2的电流变大。其中，运算放大器的信号输入正极可以理解为正相输入端，运算放大器的信号输入负极也可以理解为反相输入端。
进一步地，为了保证第二场效应管Q2和第二电阻R2组成的线路与第三电阻R3的线路的电流相同，第二电阻R2和第三电阻R3的阻值可以相等，第二电阻R2和第三电阻R3的阻值为60.4kΩ。另外，在采样模块1中还包括第六场效应管Q6和第七场效应管Q7，第六场效应管Q6和第七场效应管Q7均连接于工作电源3，第六场效应管Q6和第七场效应管Q7并联。第六场效应管Q6和第七场效应管Q7另一端连接第八场效应管Q8。第八场效应管Q8连接第二运算放大器U2的输出端。再者，需要说明的是，第一采样点A和第二采样点B为同一处采样点，同一点延伸出的两条线路。
实施例二
本申请还提供一种控制方法，控制方法包括：
步骤S10，控制采样模块采集与脉冲宽度调制信号对应的电平信号，并将电平信号传输给切换模块，其中，切换模块的一端连接采样模块，另一端连接至少一组信号反馈端，信号反馈端包括至少两个反馈点，反馈点用于与发光单元连接，切换模块和采样模块均连接工作电源；工作电源为直流电源，通过工作电源的供电，保证采样模块和切换模块中的各种电子元件能够运转、正常工作，工作电源的电压可以是5伏，也可以是12伏。采样模块用于采集与脉冲宽度调制信号对应的电平信号，脉冲宽度调制信号也简称为PWM信号。
步骤S20，控制切换模块接收电平信号，基于电平信号与预设阈值之间的关系， 控制切换模块在第一模式和第二模式之间切换，其中，在第一模式下，切换模块能够控制信号反馈端内的各反馈点相互独立，在第二模式下，切换模块能够控制信号反馈端内的各反馈点相互关联。相互关联可以理解为将各个反馈点连接在一起，公用一个流通线路。预设阈值可以理解为是对电平信号中电平的高低进行判断的依据。预设阈值的大小可以调整，一般预设阈值的范围在0.1％-10％之间。并且预设阈值可以是其中的具体值，也可以是范围值。例如预设阈值为5％时，以5％为界限，判断切换模块是切换到第一模式还是第二模式。除此之外，预设阈值还可以是0.1％、0.3％、0.5％、1％、2％、3％、4％、6％、7％、8％、9％、10％等。
具体地，在其中一个方面，基于电平信号与预设阈值之间的关系，控制切换模块在第一模式和第二模式之间切换的步骤，包括：
步骤S210，从脉冲宽度调制信号获取代表电平信号的占空比；占空比是在一个脉冲信号周期内通电时间和总时间的比值。可以知道的是，占空比越低，通电的时间越短。采样模块采集到的电平信号是占空比转化而来。占空比低时，电平信号就是低电平，占空比高时，电平信号就是高电平。
步骤S220，将占空比和预设阈值进行对比；对比两者的大小，经过两者的对比结果输出切换指令。
步骤S230，在占空比小于预设阈值时，输出第一切换指令，依据第一切换指令，控制切换模块切换至第一模式；在第一模式下，切换模块能够控制信号反馈端内的各反馈点相互独立；各反馈点相互独立是指彼此之间的电流或者电压是分开的，各自拥有独立的流通线路。
步骤S240，在占空比大于或等于预设阈值时，输出第二切换指令，依据第二切换指令，控制切换模块切换至第二模式。在第二模式下，切换模块能够控制信号反馈端内的各反馈点相互关联。相互关联可以理解为将各个反馈点连接在一起，公用一个流通线路。
在第一模式下，各个反馈点是相互独立的，此时连接每个反馈点的电流也是独立的。在第二模式下，两个反馈点会相互关联，此时，该两个反馈点连接在同一线路下。在低电平信号时，切换模块切换到第二模式，相当于将两个低电流的线路合并到了一起，由此，增加了该线路中的电流量。通过电流的增加，电压的相对波动减小，发光二极管的亮度趋于稳定，亮度不会出现高低变化。由此本技术方案能够有效减少发光 二极管的亮度闪烁。
实施例三
参阅图6所示，本申请还提供一种显示装置，显示装置包括多个发光单元5和控制电路，反馈点41与发光单元5一一对应连接。通过控制电路中切换模块2控制发光单元5的点亮。
本实施例中，显示装置包括但不限于液晶显示面板、有机发光二极管显示面板、场发射显示面板、等离子显示面板、曲面型面板，所述液晶面板包括薄膜晶体管液晶显示面板、TN面板(TN即Twisted Nematic，扭曲向列型)、VA类面板(VA即广视角类)、IPS面板(IPS即In-Plane Switching，平面转换)等。
本申请的显示装置的实施例包括上述控制电路全部实施例的全部技术方案，且所达到的技术效果也完全相同，在此不再赘述。
虽然已参照几个典型实施方式描述了本申请，但应当理解，所用的术语是说明和示例性、而非限制性的术语。由于本申请能够以多种形式具体实施而不脱离申请的精神或实质，所以应当理解，上述实施方式不限于任何前述的细节，而应在随附权利要求所限定的精神和范围内广泛地解释，因此落入权利要求或其等效范围内的全部变化和改型都应为随附权利要求所涵盖。

Claims (20)

  1. 一种控制电路，包括采样模块，所述采样模块用于采集与脉冲宽度调制信号对应的电平信号，其中，所述控制电路还包括：
    切换模块，所述切换模块的一端连接所述采样模块，另一端连接至少一组信号反馈端，所述信号反馈端包括至少两个反馈点，所述反馈点用于与发光单元连接，所述切换模块能够基于所述电平信号与预设阈值之间的关系在第一模式和第二模式之间切换；在所述第一模式下，所述切换模块能够控制所述信号反馈端内的各反馈点相互独立；在所述第二模式下，所述切换模块能够控制所述信号反馈端内的各反馈点相互关联，其中，所述各反馈点相互独立是指各反馈点具有相互独立的流通线路，所述各反馈点相互关联是指各反馈点共用一个流通线路；以及
    工作电源，所述工作电源连接所述采样模块和所述切换模块，所述工作电源为所述采样模块和所述切换模块供电。
  2. 根据权利要求1所述的控制电路，其中，所述切换模块包括至少一组恒流源子模块和至少一组控制开关子模块，所述恒流源子模块、所述控制开关子模块及所述信号反馈端一一对应设置；其中，
    所述控制开关子模块包括第一开关和第二开关；
    所述恒流源子模块包括至少两个恒流源，所述恒流源具有电源端、输入端和输出端，所述恒流源的输入端通过一条输入线路与所述采样模块连接，所述恒流源的电源端通过一条电源线路与所述工作电源连接，所述恒流源的输出端通过一条反馈线路与所述信号反馈端的一个反馈点连接；
    在多条所述电源线路中：存在一条电源线路未设置所述第一开关，剩余其他所述电源线路设置所述第一开关；
    在所述信号反馈端中，与各所述反馈点连接的各反馈线路通过所述第二开关连接；
    所述第一模式中，所述第一开关闭合，所述第二开关断开；
    所述第二模式中，所述第一开关断开，所述第二开关闭合。
  3. 根据权利要求2所述的控制电路，其中，所述恒流源子模块设置有多个，多个所述恒流源子模块之间并联设置，每一所述恒流源子模块连接一组所述信号反馈端。
  4. 根据权利要求2所述的控制电路，其中，所述切换模块还包括控制单元，所述控制单元连接所述控制开关子模块，所述控制单元用于控制所述第一开关的闭合或断开、以及所述第二开关的闭合或断开。
  5. 根据权利要求2所述的控制电路，其中，所述恒流源包括第一运算放大器、第一场效应管和第一电阻，所述第一运算放大器的电源正极连接所述工作电源，所述第一运算放大器的电源负极接地，所述第一运算放大器的信号输入正极连接所述采样模块，所述第一运算放大器的信号输入负极连接所述第一电阻，所述第一电阻的另一端接地，所述第一运算放大器的信号输出端连接所述第一场效应管，所述第一场效应管的一端连接所述第一电阻，所述第一场效应管的另一端连接一个所述反馈点。
  6. 根据权利要求1所述的控制电路，其中，所述采样模块包括第二运算放大器、第二场效应管、第一采样点和第二采样点，所述第一采样点连接所述第二运算放大器的信号输入正极，所述第二采样点连接所述第二场效应管的控制端，所述采样模块还包括第二电阻，所述第二场效应管的一端连接所述第二电阻，所述第二电阻的另一端接地，所述第二场效应管的另一端连接所述第二运算放大器的信号输入负极。
  7. 根据权利要求6所述的控制电路，其中，所述采样模块还包括第三电阻，所述第三电阻的一端连接所述第二运算放大器的信号输入负极，所述第三电阻的另一端接地，所述第二场效应管和所述第二电阻组成的线路与所述第三电阻并联。
  8. 一种控制方法，包括：
    控制采样模块采集与脉冲宽度调制信号对应的电平信号，并将所述电平信号传输给切换模块，其中，所述切换模块的一端连接所述采样模块，另一端连接至少一组信号反馈端，所述信号反馈端包括至少两个反馈点，所述反馈点用于与发光单元连接，所述切换模块和所述采样模块均连接工作电源；
    控制所述切换模块接收所述电平信号，基于所述电平信号与预设阈值之间的关系，控制所述切换模块在第一模式和第二模式之间切换，其中，在所述第一模式下，所述切换模块能够控制所述信号反馈端内的各反馈点相互独立，在所述第二模式下，所述切换模块能够控制所述信号反馈端内的各反馈点相互关联，其中，所述各反馈点相互独立是指各反馈点具有相互独立的流通线路，所述各反馈点相互关联是指各反馈点共用一个流通线路。
  9. 根据权利要求8所述的控制方法，其中，所述基于所述电平信号与预设阈值之间的关系，控制所述切换模块在第一模式和第二模式之间切换的步骤，包括：
    从脉冲宽度调制信号获取代表所述电平信号的占空比；
    将所述占空比和预设阈值进行对比；
    在所述占空比小于所述预设阈值时，输出第一切换指令，依据所述第一切换指令， 控制所述切换模块切换至所述第一模式；
    在所述占空比大于或等于所述预设阈值时，输出第二切换指令，依据所述第二切换指令，控制所述切换模块切换至所述第二模式。
  10. 根据权利要求9所述的控制方法，其中，所述预设阈值的范围为0.1％-10％。
  11. 根据权利要求8所述的控制方法，其中，所述切换模块包括至少一组恒流源子模块和至少一组控制开关子模块，所述恒流源子模块、所述控制开关子模块及所述信号反馈端一一对应设置；其中，
    所述控制开关子模块包括第一开关和第二开关；
    所述恒流源子模块包括至少两个恒流源，所述恒流源具有电源端、输入端和输出端，所述恒流源的输入端通过一条输入线路与所述采样模块连接，所述恒流源的电源端通过一条电源线路与所述工作电源连接，所述恒流源的输出端通过一条反馈线路与所述信号反馈端的一个反馈点连接；
    在多条所述电源线路中：存在一条电源线路未设置所述第一开关，剩余其他所述电源线路设置所述第一开关；
    在所述信号反馈端中，与各所述反馈点连接的各反馈线路通过所述第二开关连接；
    所述第一模式中，所述第一开关闭合，所述第二开关断开；
    所述第二模式中，所述第一开关断开，所述第二开关闭合。
  12. 根据权利要求11所述的控制方法，其中，所述恒流源子模块设置有多个，多个所述恒流源子模块之间并联设置，每一所述恒流源子模块连接一组所述信号反馈端。
  13. 根据权利要求11所述的控制方法，其中，所述恒流源包括第一运算放大器、第一场效应管和第一电阻，所述第一运算放大器的电源正极连接所述工作电源，所述第一运算放大器的电源负极接地，所述第一运算放大器的信号输入正极连接所述采样模块，所述第一运算放大器的信号输入负极连接所述第一电阻，所述第一电阻的另一端接地，所述第一运算放大器的信号输出端连接所述第一场效应管，所述第一场效应管的一端连接所述第一电阻，所述第一场效应管的另一端连接一个所述反馈点。
  14. 一种显示装置，包括多个发光单元和控制电路，所述反馈点与所述发光单元一一对应连接，所述控制电路包括：
    采样模块，所述采样模块用于采集与脉冲宽度调制信号对应的电平信号；
    切换模块，所述切换模块的一端连接所述采样模块，另一端连接至少一组信号反馈端，所述信号反馈端包括至少两个反馈点，所述反馈点用于与发光单元连接，所述切换模块能够基于所述电平信号与预设阈值之间的关系在第一模式和第二模式之间切换；在所述第一模式下，所述切换模块能够控制所述信号反馈端内的各反馈点相互独立；在所述第二模式下，所述切换模块能够控制所述信号反馈端内的各反馈点相互关联，其中，所述各反馈点相互独立是指各反馈点具有相互独立的流通线路，所述各反馈点相互关联是指各反馈点共用一个流通线路；以及
    工作电源，所述工作电源连接所述采样模块和所述切换模块，所述工作电源为所述采样模块和所述切换模块供电。
  15. 根据权利要求14所述的显示装置，其中，所述切换模块包括至少一组恒流源子模块和至少一组控制开关子模块，所述恒流源子模块、所述控制开关子模块及所述信号反馈端一一对应设置；其中，
    所述控制开关子模块包括第一开关和第二开关；
    所述恒流源子模块包括至少两个恒流源，所述恒流源具有电源端、输入端和输出端，所述恒流源的输入端通过一条输入线路与所述采样模块连接，所述恒流源的电源端通过一条电源线路与所述工作电源连接，所述恒流源的输出端通过一条反馈线路与所述信号反馈端的一个反馈点连接；
    在多条所述电源线路中：存在一条电源线路未设置所述第一开关，剩余其他所述电源线路设置所述第一开关；
    在所述信号反馈端中，与各所述反馈点连接的各反馈线路通过所述第二开关连接；
    所述第一模式中，所述第一开关闭合，所述第二开关断开；
    所述第二模式中，所述第一开关断开，所述第二开关闭合。
  16. 根据权利要求15所述的显示装置，其中，所述恒流源子模块设置有多个，多个所述恒流源子模块之间并联设置，每一所述恒流源子模块连接一组所述信号反馈端。
  17. 根据权利要求15所述的显示装置，其中，所述切换模块还包括控制单元，所述控制单元连接所述控制开关子模块，所述控制单元用于控制所述第一开关的闭合或断开、以及所述第二开关的闭合或断开。
  18. 根据权利要求15所述的显示装置，其中，所述恒流源包括第一运算放大器、第一场效应管和第一电阻，所述第一运算放大器的电源正极连接所述工作电源，所述第一运算放大器的电源负极接地，所述第一运算放大器的信号输入正极连接所述采样模块，所述第一运算放大器的信号输入负极连接所述第一电阻，所述第一电阻的另一端接地，所述第一运算放大器的信号输出端连接所述第一场效应管，所述第一场效应管的一端连接所述第一电阻，所述第一场效应管的另一端连接一个所述反馈点。
  19. 根据权利要求14所述的显示装置，其中，所述采样模块包括第二运算放大器、第二场效应管、第一采样点和第二采样点，所述第一采样点连接所述第二运算放大器的信号输入正极，所述第二采样点连接所述第二场效应管的控制端，所述采样模块还包括第二电阻，所述第二场效应管的一端连接所述第二电阻，所述第二电阻的另一端接地，所述第二场效应管的另一端连接所述第二运算放大器的信号输入负极。
  20. 根据权利要求19所述的显示装置，其中，所述采样模块还包括第三电阻，所述第三电阻的一端连接所述第二运算放大器的信号输入负极，所述第三电阻的另一端接地，所述第二场效应管和所述第二电阻组成的线路与所述第三电阻并联。
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