WO2020206802A1 - 一种运算放大器和显示装置 - Google Patents

一种运算放大器和显示装置 Download PDF

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Publication number
WO2020206802A1
WO2020206802A1 PCT/CN2019/086829 CN2019086829W WO2020206802A1 WO 2020206802 A1 WO2020206802 A1 WO 2020206802A1 CN 2019086829 W CN2019086829 W CN 2019086829W WO 2020206802 A1 WO2020206802 A1 WO 2020206802A1
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Prior art keywords
voltage
signal
temperature
inputs
preset
Prior art date
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Ceased
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PCT/CN2019/086829
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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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Publication of WO2020206802A1 publication Critical patent/WO2020206802A1/zh
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Ceased legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F1/00—Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
    • H03F1/52—Circuit arrangements for protecting such amplifiers
    • H03F1/523—Circuit arrangements for protecting such amplifiers for amplifiers using field-effect devices
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
    • H03F3/45—Differential amplifiers
    • H03F3/45071—Differential amplifiers with semiconductor devices only
    • H03F3/45076—Differential amplifiers with semiconductor devices only characterised by the way of implementation of the active amplifying circuit in the differential amplifier
    • H03F3/45179—Differential amplifiers with semiconductor devices only characterised by the way of implementation of the active amplifying circuit in the differential amplifier using MOSFET transistors as the active amplifying circuit
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
    • H03K17/08—Modifications for protecting switching circuit against overcurrent or overvoltage
    • H03K17/081—Modifications for protecting switching circuit against overcurrent or overvoltage without feedback from the output circuit to the control circuit
    • H03K17/0812—Modifications for protecting switching circuit against overcurrent or overvoltage without feedback from the output circuit to the control circuit by measures taken in the control circuit
    • H03K17/08122—Modifications for protecting switching circuit against overcurrent or overvoltage without feedback from the output circuit to the control circuit by measures taken in the control circuit in field-effect transistor switches
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
    • H03K17/14—Modifications for compensating variations of physical values, e.g. of temperature
    • H03K17/145—Modifications for compensating variations of physical values, e.g. of temperature in field-effect transistor switches
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
    • H03K17/51—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used
    • H03K17/56—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used by the use, as active elements, of semiconductor devices
    • H03K17/687—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used by the use, as active elements, of semiconductor devices the devices being field-effect transistors

Definitions

  • This application relates to the field of display technology, in particular to an operational amplifier and a display device.
  • the display panel will have horizontal crosstalk phenomenon, which affects the display effect of the picture and the rating of the display panel.
  • the common electrode voltage compensation circuit shown in FIG. 1 is usually used.
  • the operational amplifier receives the common electrode compensation voltage Vcom_FB signal of the display panel, amplifies it, and then inputs it into the display panel through the Vout terminal. , In order to compensate the influence of capacitive coupling on the common electrode voltage Vcom, thereby improving the horizontal crosstalk phenomenon.
  • the present application provides an operational amplifier and a display device to avoid the problem of the operational amplifier being damaged due to excessive current caused by excessive temperature.
  • an embodiment of the present application provides an operational amplifier.
  • the operational amplifier includes: an amplifying module, the amplifying module includes an output terminal, and the output terminal is used to output a working current to an electronic device; an overcurrent protection module, an overcurrent protection module Connected to the output terminal and used to detect the temperature of the amplifying module and control the size of the working current according to the temperature so that the temperature is not higher than the first preset temperature threshold.
  • the overcurrent protection module includes at least one shunt circuit, the shunt circuit includes a first resistor and a control switch connected in series with each other, one end of the shunt circuit is connected to the output terminal, and the other end is grounded; when the temperature is not higher than the first preset temperature threshold , The control switches are all turned off; when the temperature is higher than the first preset temperature threshold, at least one control switch is turned on to reduce the operating current.
  • the overcurrent protection module also includes a detection circuit and a comparison circuit connected to the detection circuit; the detection circuit is used to input the voltage to be compared to the comparison circuit, the detection circuit includes a thermal element, and the voltage to be compared is the voltage drop of the thermal element; When the temperature is not higher than the first preset temperature threshold, the comparison circuit inputs a disconnection signal to each control switch, so that the control switches are all turned off; when the temperature is higher than the first preset temperature threshold, the comparison circuit is directed to at least One control switch inputs a conduction signal to turn on at least one control switch.
  • the comparison circuit when the temperature is higher than the first preset temperature threshold and not higher than the second preset temperature threshold, the comparison circuit inputs a conduction signal to at least one control switch, and inputs to at least one control switch Disconnect signal; when the temperature is higher than the second preset temperature threshold, the comparison circuit inputs a conduction signal to each control switch.
  • the detection circuit further includes a second resistor, one end of the second resistor is input with a preset voltage, the other end of the second resistor is connected to one end of the thermal element, and the other end of the thermal element is grounded.
  • the thermal element is a positive temperature coefficient thermistor or a negative temperature coefficient thermistor.
  • control switch is a field effect tube
  • comparison circuit is connected to the gate of the field effect tube
  • conduction signal is a voltage signal
  • the comparison circuit and the shunt circuit have a one-to-one correspondence.
  • the comparison circuit includes at least one voltage comparator and a logic control unit connected to the at least one voltage comparator; the detection circuit is connected to the voltage comparator and inputs the voltage to be compared to the voltage comparator; each voltage comparator corresponds to a preset Set the reference voltage.
  • the voltage comparator inputs a high-level signal to the logic control unit.
  • the voltage comparator controls the logic The unit inputs a low-level signal; the logic control unit is used to input a turn-on signal and/or a turn-off signal to the control switch according to the high-level signal and/or the low-level signal.
  • the overcurrent protection module includes two shunt circuits
  • the comparison circuit includes two voltage comparators, the two voltage comparators respectively correspond to the first preset reference voltage and the second preset reference voltage, and the second preset reference voltage
  • the voltage is greater than the first preset reference voltage; when the voltage to be compared is higher than the second preset reference voltage, the logic control unit inputs conduction signals to the two control switches; when the voltage to be compared is not higher than the second preset reference voltage When the specific voltage is higher than the first preset reference voltage, the logic control unit inputs a turn-on signal to any control switch, and inputs a turn-off signal to the other control switch; when the voltage to be compared is not higher than the first preset reference voltage When voltage is applied, the logic control unit inputs a disconnect signal to the two control switches.
  • the embodiment of the present application also provides a display device, the display device includes an operational amplifier and an electronic device connected to the operational amplifier.
  • the electronic device is a display panel.
  • the operational amplifier includes an amplifying module, and the amplifying module includes an output.
  • the output terminal is used to output the working current to the electronic device;
  • the overcurrent protection module, the overcurrent protection module is connected to the output terminal, is used to detect the temperature of the amplifying module, and control the working current according to the temperature, so that the temperature is not higher than the first A preset temperature threshold.
  • the overcurrent protection module includes at least one shunt circuit, the shunt circuit includes a first resistor and a control switch connected in series with each other, one end of the shunt circuit is connected to the output terminal, and the other end is grounded; when the temperature is not higher than the first preset temperature threshold , The control switches are all turned off; when the temperature is higher than the first preset temperature threshold, at least one control switch is turned on to reduce the operating current.
  • the overcurrent protection module also includes a detection circuit and a comparison circuit connected to the detection circuit; the detection circuit is used to input the voltage to be compared to the comparison circuit, the detection circuit includes a thermal element, and the voltage to be compared is the voltage drop of the thermal element; When the temperature is not higher than the first preset temperature threshold, the comparison circuit inputs a disconnection signal to each control switch, so that the control switches are all turned off; when the temperature is higher than the first preset temperature threshold, the comparison circuit is directed to at least One control switch inputs a conduction signal to turn on at least one control switch.
  • the comparison circuit when the temperature is higher than the first preset temperature threshold and not higher than the second preset temperature threshold, the comparison circuit inputs a conduction signal to at least one control switch, and inputs to at least one control switch Disconnect signal; when the temperature is higher than the second preset temperature threshold, the comparison circuit inputs a conduction signal to each control switch.
  • the detection circuit further includes a second resistor, one end of the second resistor is input with a preset voltage, the other end of the second resistor is connected to one end of the thermal element, and the other end of the thermal element is grounded.
  • the thermal element is a positive temperature coefficient thermistor or a negative temperature coefficient thermistor.
  • control switch is a field effect tube
  • comparison circuit is connected to the gate of the field effect tube
  • conduction signal is a voltage signal
  • the comparison circuit and the shunt circuit have a one-to-one correspondence.
  • the comparison circuit includes at least one voltage comparator and a logic control unit connected to the at least one voltage comparator; the detection circuit is connected to the voltage comparator and inputs the voltage to be compared to the voltage comparator; each voltage comparator corresponds to a preset Set the reference voltage.
  • the voltage comparator inputs a high-level signal to the logic control unit.
  • the voltage comparator controls the logic The unit inputs a low-level signal; the logic control unit is used to input a turn-on signal and/or a turn-off signal to the control switch according to the high-level signal and/or the low-level signal.
  • the overcurrent protection module includes two shunt circuits
  • the comparison circuit includes two voltage comparators, the two voltage comparators respectively correspond to the first preset reference voltage and the second preset reference voltage, and the second preset reference voltage
  • the voltage is greater than the first preset reference voltage; when the voltage to be compared is higher than the second preset reference voltage, the logic control unit inputs conduction signals to the two control switches; when the voltage to be compared is not higher than the second preset reference voltage When the specific voltage is higher than the first preset reference voltage, the logic control unit inputs a turn-on signal to any control switch, and inputs a turn-off signal to the other control switch; when the voltage to be compared is not higher than the first preset reference voltage When voltage is applied, the logic control unit inputs a disconnect signal to the two control switches.
  • the operational amplifier provided in the present application includes an amplifying module and an overcurrent protection module, wherein the amplifying module includes an output terminal, and the output terminal is used to output working current to the electronic device.
  • the module is connected to the output terminal and is used to detect the temperature of the amplifying module and control the working current according to the temperature so that the temperature is not higher than the first preset temperature threshold, so as to prevent the operational amplifier from being damaged due to excessive current and high temperature.
  • FIG. 1 is a schematic diagram of a common electrode voltage compensation circuit provided by the prior art
  • FIG. 2 is a schematic structural diagram of an operational amplifier provided by an embodiment of the present application.
  • FIG. 3 is another schematic structural diagram of an operational amplifier provided by an embodiment of the present application.
  • FIG. 4 is another schematic structural diagram of an operational amplifier provided by an embodiment of the present application.
  • FIG. 5 is a schematic diagram of the structure of the comparison circuit in FIG. 4;
  • FIG. 6 is another schematic structural diagram of an operational amplifier provided by an embodiment of the present application.
  • FIG. 7 is a schematic structural diagram of a display device provided by an embodiment of the present application.
  • the technical solution adopted in this application is to provide an overcurrent protection module in the operational amplifier to avoid the problem of the operational amplifier being damaged due to excessive current and high temperature.
  • FIG. 2 is a schematic structural diagram of an operational amplifier provided by an embodiment of the present application.
  • the operational amplifier 20 includes an amplification module 21 and an overcurrent protection module 22.
  • the amplifying module 21 includes an output terminal 211, and the output terminal 211 is used to output a working current to the electronic device 30.
  • the overcurrent protection module 22 is connected to the output terminal 211 for detecting the temperature of the amplifying module 21 and controlling the working current according to the temperature so that the temperature is not higher than the first preset temperature threshold, thereby preventing the operational amplifier 20 from being overheated And destroyed.
  • the amplifying module 21 further includes an input terminal (not shown in the figure), and the input terminal is used to receive the signal to be amplified. After amplifying the signal to be amplified, the amplifying module 21 outputs the amplified signal to the electronic device 30 through the output terminal 211 to output a working current to the electronic device 30.
  • the overcurrent protection module 22 includes at least one shunt circuit 221.
  • the shunt circuit 221 includes a first resistor R1 and a control switch S1 connected in series with each other. One end of the shunt circuit 221 is connected to the output terminal 211. , The other end is grounded.
  • the control switches S1 are all turned off.
  • at least one control switch S1 is turned on to reduce the operating current, so that the temperature of the amplifying module 21 is not higher than the first preset temperature threshold.
  • the overcurrent protection module 22 includes three shunt circuits 221.
  • the control switches S1 of the three shunt circuits 221 are all turned off, that is, the overcurrent protection module 22 has no effect on the working current output from the output terminal 211 to the electronic device 30.
  • the control switch S1 of the shunt circuit 221 is turned on, so that the first resistor R1 of the shunt circuit 221 is connected in parallel with the electronic device 30, This reduces the operating current output from the output terminal 211 to the electronic device 30 to a certain extent.
  • the control switches S1 of the two shunt circuits 221 are turned on, so that the first resistor R1 of the two shunt circuits 221 and the electronic device 30 is connected in parallel to reduce the operating current output from the output terminal 211 to the electronic device 30 to a greater extent.
  • the control switches S1 of the three shunt circuits 221 are all turned on, so that the first resistors R1 of the three shunt circuits 221 are all connected in parallel with the electronic device 30 to minimize
  • the output terminal 211 outputs the operating current to the electronic device 30.
  • the first preset temperature threshold is less than the second preset temperature threshold
  • the second preset temperature threshold is less than the third preset temperature threshold.
  • the overcurrent protection module 22 further includes a detection circuit 222 and a comparison circuit 223 connected to the detection circuit 222.
  • the detection circuit 222 is used to input the voltage VA to be compared to the comparison circuit 223, and the detection circuit 222 includes a thermal element P, and the voltage VA to be compared is the voltage drop of the thermal element P.
  • the comparison circuit 223 inputs a disconnection signal to each control switch S1 to turn off the control switches S1.
  • the comparison circuit 223 inputs a conduction signal to the at least one control switch S1, so that the at least one control switch S1 is turned on.
  • the detection circuit 222 may further include a second resistor R2, one end of the second resistor R2 is input with a preset voltage V1, and the other end of the second resistor R2 is connected to one end of the thermistor P Connect, the other end of the thermal element P is grounded.
  • the thermal element P can be a positive temperature coefficient thermistor or a negative temperature coefficient thermistor. If the thermal element P is a positive temperature coefficient thermistor, when the temperature of the amplifying module 21 is not higher than the first preset temperature threshold, the voltage to be compared VA is not greater than the first preset reference voltage Vref1, and when the amplifying module 21 When the temperature of is higher than the first preset temperature threshold, the voltage to be compared VA is greater than the first preset reference voltage Vref1.
  • the thermal element p is a negative temperature coefficient thermistor
  • the voltage to be compared VA is not less than the first preset reference voltage Vref1
  • the voltage to be compared VA is less than the first preset reference voltage Vref1.
  • the thermal element P is a positive temperature coefficient thermistor
  • the first preset reference voltage Vref1 is less than the second preset reference voltage Vref2.
  • the to-be-compared voltage VA is not greater than the first preset reference voltage Vref1
  • the comparison circuit 223 inputs an off signal to each control switch S1.
  • the comparison circuit 223 inputs an on signal to at least one control switch S1, and inputs an off signal to at least one control switch S1.
  • the comparison voltage VA is greater than the first preset reference voltage Vref2
  • the comparison circuit 223 inputs a conduction signal to each control switch S1.
  • control switch S1 may be a field effect tube, for example, a MOS tube
  • the comparison circuit 223 is connected to the gate G of the field effect tube S1
  • the above-mentioned turn-on signal is a voltage signal
  • the voltage value corresponding to the voltage signal is greater than that of the field effect tube
  • the threshold voltage of S1 correspondingly, the above-mentioned disconnection signal is also a voltage signal, and the voltage value corresponding to the voltage signal is smaller than the threshold voltage of the field effect transistor S1.
  • the comparison circuit 223 includes a first circuit 2231 and a comparator 2232.
  • the first circuit 2231 includes a third resistor R3 and a fourth resistor R4.
  • One end of the third resistor R3 is input with a preset voltage V2
  • the other end of the third resistor R3 is connected to one end of the fourth resistor R4, and the other end of the fourth resistor R4 is grounded.
  • the first preset reference voltage Vref1 or the second preset reference voltage Vref2 is the voltage of the fourth resistor R4.
  • the different first circuits 223 provide different preset reference voltages Vref to the corresponding comparator 2232.
  • the comparator 2232 inputs a conduction signal to the control switch S1 in the corresponding shunt circuit 221
  • the comparator 2232 inputs a disconnection signal to the control switch S1 in the corresponding shunt circuit 221.
  • the aforementioned first preset temperature threshold and the voltage drop of the fourth resistor R4 correspond to each other.
  • the fourth resistor R4 may be an adjustable resistor, that is, the size of the fourth resistor R4 can be artificially adjusted to adjust the size of the first preset temperature threshold.
  • the first preset temperature threshold needs to be set to 60°C, it is necessary to obtain the to-be-compared voltage VA output by the detection circuit 222 at 60°C, and then adjust the first circuit 2231 of the corresponding comparison circuit 223
  • the size of the third resistor R3 or the fourth resistor R4 is such that the voltage drop of the fourth resistor R4 is equal to the voltage VA to be compared under the condition of 60°C.
  • the corresponding voltage VA to be compared will be greater than the first preset reference voltage Vref1, and the comparator 2232 inputs a conduction signal to at least one control switch S1 to reduce the work
  • the current in turn makes the temperature of the amplifying module 21 not higher than 60°C.
  • the comparison circuit 223 includes at least one voltage comparator 2233 and a logic control unit 2234 connected to the at least one voltage comparator 2233.
  • the detection circuit 222 is connected to the voltage comparator 2233, and inputs the voltage VA to be compared to the voltage comparator 2233.
  • Each voltage comparator 2233 corresponds to a preset reference voltage. When the voltage to be compared is higher than the preset reference voltage, the voltage comparator 2233 inputs a high-level signal to the logic control unit 2234. When the voltage to be compared VA is lower than When the reference voltage is preset, the voltage comparator 2233 inputs a low-level signal to the logic control unit 2234.
  • the logic control unit 2234 is configured to input an on signal and/or an off signal to the control switch S1 according to the high-level signal and/or the low-level signal.
  • the high level signal is the logic level "1”
  • the low level signal is the logic level "0”.
  • the logic control unit 2234 inputs a turn-on signal and/or a turn-off signal to the control switch S1 according to the number of "1"s and or "0"s received, and the more “1”s it receives, the more the control switch S1 is turned on. many.
  • the overcurrent protection module 22 includes two shunt circuits 221, and the comparison circuit 223 includes two voltage comparators 2233.
  • the two voltage comparators 2233 respectively correspond to the first preset reference voltage Vref1 and the second preset reference voltage. Assuming the reference voltage Vref2, the second preset reference voltage Vref2 is greater than the first preset reference voltage Vref1.
  • the A0 and A1 output by the comparator 2233 are both "1"
  • the logic control unit 2234 inputs conduction signals to the two control switches S1.
  • the operational amplifier provided in this application includes an amplifying module and an overcurrent protection module.
  • the amplifying module includes an output terminal.
  • the output terminal is used to output working current to the electronic device.
  • the overcurrent protection module is connected to the output terminal. To detect the temperature of the amplifying module, and control the working current according to the temperature, so that the temperature is not higher than the first preset temperature threshold, so as to prevent the operational amplifier from being damaged due to excessive current caused by excessive temperature.
  • FIG. 7 is a schematic structural diagram of a display device provided by an embodiment of the present application.
  • the display device 70 includes the operational amplifier 71 of any of the above-mentioned embodiments, and an electronic device 72 connected to the operational amplifier.
  • the electronic device 72 is a display panel.
  • the operational amplifier 71 includes an amplifying module and an overcurrent protection module.
  • the amplifying module includes an output terminal.
  • the output terminal is used to output working current to the display panel 72.
  • the overcurrent protection module is connected to the output terminal and is used to detect Temperature, and control the size of the operating current according to the temperature, so that the temperature of the amplifying module is not higher than the first preset temperature threshold.
  • the amplifying module further includes two input terminals, wherein one input terminal is used to receive the common electrode voltage signal to be input to the display panel 72, and the other input terminal is used to receive the common electrode compensation voltage signal.
  • the common electrode compensation voltage signal is amplified by the amplifying module, it is output to the pixel common electrode of the display panel 72 through the output terminal of the amplifying module to compensate for the effect of capacitive coupling on the common electrode voltage signal and provide the above-mentioned working current, thereby avoiding Horizontal crosstalk occurs on the display panel 72.
  • the operational amplifier includes an amplifying module and an overcurrent protection module, wherein the amplifying module includes an output terminal, the output terminal is used to output working current to the display panel, and the overcurrent protection module is connected to the output The terminal is used to detect the temperature of the amplifying module, and control the working current according to the temperature, so that the temperature is not higher than the first preset temperature threshold, so as to prevent the operational amplifier from being damaged due to the high current caused by the high temperature.

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Abstract

公开了一种运算放大器和显示装置，运算放大器（20）包括：放大模块（21），放大模块（21）包括输出端（211），输出端（211）用于向电子设备（30）输出工作电流；过流保护模块（22），过流保护模块（22）连接于输出端（211），用于检测放大模块（21）的温度，并根据温度控制工作电流大小，以使温度不高于第一预设温度阈值。

Description

一种运算放大器和显示装置 技术领域
本申请涉及显示技术领域，具体涉及一种运算放大器和显示装置。
 背景技术
随着薄膜晶体管液晶显示面板尺寸的变大，显示面板会出现水平串扰现象，这种现象影响画面的显示效果以及显示面板的评级。
在现有技术中，通常使用如图1所示的公共电极电压补偿电路，运算放大器通过接收显示面板的公共电极补偿电压Vcom_FB信号，并将其进行放大后，再经Vout端输入到显示面板内部，以补偿电容耦合对公共电极电压Vcom的影响，进而改善水平串扰现象。
但是，这种线路对运算放大器的要求会非常高，特别是对于一些画面，如重载画面，运算放大器会由于电流过大，温度过高，而容易烧毁。
 技术问题
本申请提供了一种运算放大器和显示装置，以避免运算放大器由于电流过大，导致温度过高而损坏的问题。
 技术解决方案
为了解决上述问题，本申请实施例提供了一种运算放大器，该运算放大器包括：放大模块，放大模块包括输出端，输出端用于向电子设备输出工作电流；过流保护模块，过流保护模块连接于输出端，用于检测放大模块的温度，并根据温度控制工作电流大小，以使温度不高于第一预设温度阈值。
其中，过流保护模块包括至少一个分流电路，分流电路包括相互串联的第一电阻和控制开关，分流电路的一端连接于输出端，另一端接地；当温度不高于第一预设温度阈值时，控制开关均断开；当温度高于第一预设温度阈值时，至少一个控制开关导通，以减小工作电流。
其中，过流保护模块还包括检测电路、以及与检测电路连接的比较电路；检测电路用于向比较电路输入待比较电压，检测电路包括热敏元件，待比较电压为热敏元件的压降；当温度不高于第一预设温度阈值时，比较电路向每个控制开关均输入断开信号，以使控制开关均断开；当温度高于第一预设温度阈值时，比较电路向至少一个控制开关输入导通信号，以使至少一个控制开关导通。
其中，分流电路为至少两个；当温度高于第一预设温度阈值且不高于第二预设温度阈值时，比较电路向至少一个控制开关输入导通信号，并向至少一个控制开关输入断开信号；当温度高于第二预设温度阈值时，比较电路向每一控制开关均输入导通信号。
其中，检测电路还包括第二电阻，第二电阻的一端输入有预设电压，第二电阻的另一端与热敏元件的一端连接，热敏元件的另一端接地。
其中，热敏元件为正温度系数热敏电阻或负温度系数热敏电阻。
其中，控制开关为场效应管，比较电路与场效应管的栅极连接，导通信号为电压信号。
其中，比较电路为至少一个，比较电路与分流电路一一对应。
其中，比较电路包括至少一个电压比较器、以及与至少一个电压比较器连接的逻辑控制单元；检测电路连接于电压比较器，并向电压比较器输入待比较电压；每一电压比较器对应一预设参比电压，当待比较电压高于预设参比电压时，电压比较器向逻辑控制单元输入高电平信号，当待比较电压低于预设参比电压时，电压比较器向逻辑控制单元输入低电平信号；逻辑控制单元用于根据高电平信号和/或低电平信号，向控制开关输入导通信号和/或断开信号。
其中，过流保护模块包括两个分流电路，比较电路包括两个电压比较器，两个电压比较器分别对应第一预设参比电压和第二预设参比电压，第二预设参比电压大于第一预设参比电压；当待比较电压高于第二预设参比电压时，逻辑控制单元向两个控制开关输入导通信号；当待比较电压不高于第二预设参比电压且高于第一预设参比电压时，逻辑控制单元向任意一个控制开关输入导通信号，向另一个控制开关输入断开信号；当待比较电压不高于第一预设参比电压时，逻辑控制单元向两个控制开关输入断开信号。
为了解决上述问题，本申请实施例还提供了一种显示装置，该显示装置包括运算放大器、以及与运算放大器连接的电子设备，电子设备为显示面板，运算放大器包括：放大模块，放大模块包括输出端，输出端用于向电子设备输出工作电流；过流保护模块，过流保护模块连接于输出端，用于检测放大模块的温度，并根据温度控制工作电流大小，以使温度不高于第一预设温度阈值。
其中，过流保护模块包括至少一个分流电路，分流电路包括相互串联的第一电阻和控制开关，分流电路的一端连接于输出端，另一端接地；当温度不高于第一预设温度阈值时，控制开关均断开；当温度高于第一预设温度阈值时，至少一个控制开关导通，以减小工作电流。
其中，过流保护模块还包括检测电路、以及与检测电路连接的比较电路；检测电路用于向比较电路输入待比较电压，检测电路包括热敏元件，待比较电压为热敏元件的压降；当温度不高于第一预设温度阈值时，比较电路向每个控制开关均输入断开信号，以使控制开关均断开；当温度高于第一预设温度阈值时，比较电路向至少一个控制开关输入导通信号，以使至少一个控制开关导通。
其中，分流电路为至少两个；当温度高于第一预设温度阈值且不高于第二预设温度阈值时，比较电路向至少一个控制开关输入导通信号，并向至少一个控制开关输入断开信号；当温度高于第二预设温度阈值时，比较电路向每一控制开关均输入导通信号。
其中，检测电路还包括第二电阻，第二电阻的一端输入有预设电压，第二电阻的另一端与热敏元件的一端连接，热敏元件的另一端接地。
其中，热敏元件为正温度系数热敏电阻或负温度系数热敏电阻。
其中，控制开关为场效应管，比较电路与场效应管的栅极连接，导通信号为电压信号。
其中，比较电路为至少一个，比较电路与分流电路一一对应。
其中，比较电路包括至少一个电压比较器、以及与至少一个电压比较器连接的逻辑控制单元；检测电路连接于电压比较器，并向电压比较器输入待比较电压；每一电压比较器对应一预设参比电压，当待比较电压高于预设参比电压时，电压比较器向逻辑控制单元输入高电平信号，当待比较电压低于预设参比电压时，电压比较器向逻辑控制单元输入低电平信号；逻辑控制单元用于根据高电平信号和/或低电平信号，向控制开关输入导通信号和/或断开信号。
其中，过流保护模块包括两个分流电路，比较电路包括两个电压比较器，两个电压比较器分别对应第一预设参比电压和第二预设参比电压，第二预设参比电压大于第一预设参比电压；当待比较电压高于第二预设参比电压时，逻辑控制单元向两个控制开关输入导通信号；当待比较电压不高于第二预设参比电压且高于第一预设参比电压时，逻辑控制单元向任意一个控制开关输入导通信号，向另一个控制开关输入断开信号；当待比较电压不高于第一预设参比电压时，逻辑控制单元向两个控制开关输入断开信号。
 有益效果
本申请的有益效果是：区别于现有技术，本申请提供的运算放大器包括放大模块和过流保护模块，其中，放大模块包括输出端，输出端用于向电子设备输出工作电流，过流保护模块连接于输出端，用于检测放大模块的温度，并根据温度控制工作电流大小，以使温度不高于第一预设温度阈值，从而避免运算放大器由于电流过大，导致温度过高而损坏。
 附图说明
为了更清楚地说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介绍，显而易见地，下面描述中的附图仅仅是发明的一些实施例，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是现有技术提供的公共电极电压补偿电路示意图；
图2是本申请实施例提供的运算放大器的结构示意图；
图3是本申请实施例提供的运算放大器的另一结构示意图；
图4是本申请实施例提供的运算放大器的另一结构示意图；
图5是图4中比较电路的结构示意图；
图6是本申请实施例提供的运算放大器的另一结构示意图；
图7是本申请实施例提供的显示装置的结构示意图。
 本发明的实施方式
下面结合附图和实施例，对本申请作进一步地详细描述。特别指出的是，以下实施例仅用于说明本申请，但不对本申请的范围进行限定。同样的，以下实施例仅为本申请的部分实施例而非全部实施例，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它实施例，都属于本申请保护的范围。
由于显示装置中像素公共电极电压补偿电路对运算放大器的要求非常高，特别是对于一些画面，如重载画面，运算放大器会由于电流过大，温度过高，而容易烧毁。为解决上述技术问题，本申请采用的技术方案是通过在运算放大器中设置过流保护模块，以避免运算放大器由于电流过大，导致温度过高而损坏的问题。
请参阅图2，图2是本申请实施例提供的运算放大器的结构示意图。如图2所示，运算放大器20包括放大模块21和过流保护模块22。其中，放大模块21包括输出端211，输出端211用于向电子设备30输出工作电流。过流保护模块22连接于输出端211，用于检测放大模块21的温度，并根据温度控制工作电流大小，以使温度不高于第一预设温度阈值，进而避免运算放大器20因温度过高而毁坏。
其中，放大模块21还包括输入端（图中未示出），输入端用于接收待放大信号。放大模块21对该待放大信号进行放大后，通过输出端211输出放大后的信号至电子设备30，以向电子设备30输出工作电流。
在一个实施例中，如图3所示，过流保护模块22包括至少一个分流电路221，分流电路221包括相互串联的第一电阻R1和控制开关S1，分流电路221的一端连接于输出端211，另一端接地。当放大模块21的温度不高于第一预设温度阈值时，控制开关S1均断开。当放大模块21的温度高于第一预设温度阈值时，至少一个控制开关S1导通，以减小工作电流，进而使得放大模块21的温度不高于第一预设温度阈值。
例如，继续参阅图3，过流保护模块22包括三个分流电路221。当温度不高于第一预设温度阈值时，三个分流电路221的控制开关S1均断开，即过流保护模块22对输出端211输出至电子设备30的工作电流无影响。当温度高于第一预设温度阈值且不高于第二预设温度阈值时，只有一个分流电路221的控制开关S1导通，使得该分流电路221的第一电阻R1与电子设备30并联，以在一定程度上减小输出端211输出至电子设备30的工作电流。当温度高于第二预设温度阈值且不高于第三预设温度阈值时，只有两个分流电路221的控制开关S1导通，使得这两个分流电路221的第一电阻R1与电子设备30并联，以在较大程度上减小输出端211输出至电子设备30的工作电流。当温度高于第三预设温度阈值时，三个分流电路221的控制开关S1均导通，使得三个分流电路221的第一电阻R1均与电子设备30并联，以在最大程度上减小输出端211输出至电子设备30的工作电流。其中，第一预设温度阈值小于第二预设温度阈值，第二预设温度阈值小于第三预设温度阈值。如此，通过设置多个温度区间对输出端211输出至电子设备30的工作电流进行不同程度地减小，以使得放大模块21的温度不高于第一预设温度阈值，有利于提高降温速率及减小功耗。
在一个具体实施例中，如图4所示，过流保护模块22还包括检测电路222、以及与检测电路222连接的比较电路223。其中，检测电路222用于向比较电路223输入待比较电压VA，检测电路222包括热敏元件P，待比较电压VA为热敏元件P的压降。当放大模块21的温度不高于第一预设温度阈值时，比较电路223向每个控制开关S1均输入断开信号，以使控制开关S1均断开。当放大模块21的温度高于第一预设温度阈值时，比较电路223向至少一个控制开关S1输入导通信号，以使至少一个控制开关S1导通。
在一些实施例中，如图4所示，检测电路222还可以包括第二电阻R2，第二电阻R2的一端输入有预设电压V1，第二电阻R2的另一端与热敏元件P的一端连接，热敏元件P的另一端接地。
其中，热敏元件P可以为正温度系数热敏电阻或负温度系数热敏电阻。若热敏元件P为正温度系数热敏电阻，则当放大模块21的温度不高于第一预设温度阈值时，待比较电压VA不大于第一预设参比电压Vref1，当放大模块21的温度高于第一预设温度阈值时，待比较电压VA大于第一预设参比电压Vref1。若热敏元件p为负温度系数热敏电阻，则当放大模块21的温度不高于第一预设温度阈值时，待比较电压VA不小于第一预设参比电压Vref1，当放大模块21的温度高于第一预设温度阈值时，待比较电压VA小于第一预设参比电压Vref1。
例如，继续参阅图4，分流电路221为至少两个，热敏元件P为正温度系数热敏电阻，第一预设参比电压Vref1小于第二预设参比电压Vref2。当放大模块21的温度不高于第一预设温度阈值时，待比较电压VA不大于第一预设参比电压Vref1，比较电路223向每个控制开关S1均输入断开信号。当放大模块21的温度高于第一预设温度阈值且不高于第二预设温度阈值时，待比较电压VA大于第一预设参比电压Vref1且不大于第二预设参比电压Vref2，比较电路223向至少一个控制开关S1输入导通信号，并向至少一个控制开关S1输入断开信号。当放大模块21的温度高于第二预设温度阈值时，待比较电压VA大于第一预设参比电压Vref2，比较电路223向每一控制开关S1均输入导通信号。
其中，控制开关S1可以为场效应管，例如，MOS管，比较电路223与场效应管S1的栅极G连接，上述导通信号为电压信号，且该电压信号对应的电压值大于场效应管S1的阈值电压，对应地，上述断开信号也为电压信号，且该电压信号对应的电压值小于场效应管S1的阈值电压。
在一些实施例中，如图4所示，比较电路223为至少一个，且与分流电路221一一对应。具体地，如图5所示，比较电路223包括第一电路2231和比较器2232，第一电路2231包括第三电阻R3和第四电阻R4，第三电阻R3的一端输入有预设电压V2，第三电阻R3的另一端与第四电阻R4的一端连接，第四电阻R4的另一端接地，上述第一预设参比电压Vref1或第二预设参比电压Vref2为第四电阻R4的压降Vref，且根据欧姆定律，Vref=V2*R4/(R3+R4)。不同的第一电路223提供不同的预设参比电压Vref至对应的比较器2232，当待比较电压VA大于Vref时，比较器2232向对应的分流电路221中的控制开关S1输入导通信号，当待比较电压VA不大于预设参比电压Vref时，比较器2232向对应的分流电路221中的控制开关S1输入断开信号。
具体地，上述第一预设温度阈值与第四电阻R4的压降相互对应。例如，在预设电压V2一定的条件下，通过改变第三电阻R3和第四电阻R4的相对大小，可以改变第四电阻R4的压降，对应的第一预设温度阈值也会改变。又例如，第四电阻R4可以为可调电阻，即可通过人为调节第四电阻R4的大小，以调整上述第一预设温度阈值的大小。
例如，若需要设定的第一预设温度阈值为60℃，则需要先获取检测电路222在60℃条件下输出的待比较电压VA，然后通过调整对应的比较电路223的第一电路2231的第三电阻R3或第四电阻R4的大小，以使第四电阻R4的压降等于60℃条件下的待比较电压VA。如此，当放大模块21的工作温度高于60℃时，对应的待比较电压VA会大于第一预设参比电压Vref1，比较器2232向至少一个控制开关S1输入导通信号，以减小工作电流，进而使得放大模块21的温度不高于60℃。
在另一个具体实施例中，如图6所示，比较电路223包括至少一个电压比较器2233、以及与所述至少一个电压比较器2233连接的逻辑控制单元2234。检测电路222连接于电压比较器2233，并向电压比较器2233输入待比较电压VA。每一电压比较器2233对应一预设参比电压，当待比较电压高VA于预设参比电压时，电压比较器2233向逻辑控制单元2234输入高电平信号，当待比较电压VA低于预设参比电压时，电压比较器2233向逻辑控制单元2234输入低电平信号。逻辑控制单元2234用于根据高电平信号和/或低电平信号，向控制开关S1输入导通信号和/或断开信号。
其中，高电平信号为逻辑准位“1”，低电平信号为逻辑准位“0”。逻辑控制单元2234根据接收到“1”和或“0”的数量，向控制开关S1输入导通信号和/或断开信号,且接收到的“1”越多，导通的控制开关S1越多。
例如，继续参阅图6，过流保护模块22包括两个分流电路221，比较电路223包括两个电压比较器2233，两个电压比较器2233分别对应第一预设参比电压Vref1和第二预设参比电压Vref2，第二预设参比电压Vref2大于第一预设参比电压Vref1。当待比较电压VA高于第二预设参比电压Vref2时，比较器2233输出的A0和A1均为“1”，逻辑控制单元2234向两个控制开关S1输入导通信号。当待比较电压VA不高于第二预设参比电压Vref2且高于第一预设参比电压Vref1时，比较器2233输出的A0位“1”，A1均为“0”，逻辑控制单元2234向任意一个控制开关S1输入导通信号，向另一个控制开关S1输入断开信号。当待比较电压VA不高于第一预设参比电压Vref1时，比较器2233输出的A0和A1均为“0”，逻辑控制单元向两个控制开关输入断开信号。
区别于现有技术，本申请提供的运算放大器包括放大模块和过流保护模块，其中，放大模块包括输出端，输出端用于向电子设备输出工作电流，过流保护模块连接于输出端，用于检测放大模块的温度，并根据温度控制工作电流大小，以使温度不高于第一预设温度阈值，从而避免运算放大器由于电流过大，导致温度过高而损坏。
请参阅图7，图7是本申请实施例提供的显示装置的结构示意图。如图7所示，该显示装置70包括上述任一实施例的运算放大器71、以及与运算放大器连接的电子设备72，电子设备72为显示面板。
具体地，运算放大器71包括放大模块和过流保护模块，其中，放大模块包括输出端，输出端用于向显示面板72输出工作电流，过流保护模块连接于输出端，用于检测放大模块的温度，并根据温度控制工作电流大小，以使放大模块的温度不高于第一预设温度阈值。
在一个实施例中，放大模块还包括两个输入端，其中，一个输入端用于接收待输入显示面板72的公共电极电压信号，另一个输入端用于接收公共电极补偿电压信号。并且，公共电极补偿电压信号通过放大模块进行放大后，经过放大模块的输出端输出至显示面板72的像素公共电极，以补偿电容耦合对上述公共电极电压信号的影响并提供上述工作电流，进而避免显示面板72发生水平串扰。
区别于现有技术，本申请提供的显示装置，运算放大器包括放大模块和过流保护模块，其中，放大模块包括输出端，输出端用于向显示面板输出工作电流，过流保护模块连接于输出端，用于检测放大模块的温度，并根据温度控制工作电流大小，以使温度不高于第一预设温度阈值，从而避免运算放大器由于电流过大，导致温度过高而损坏。
以上所述仅为本申请的较佳实施例而已，并不用以限制本申请，凡在本申请的精神和原则之内所作的任何修改、等同替换和改进等，均应包含在本申请的保护范围之内。

Claims (20)

  1. 一种运算放大器，其包括：
    放大模块，所述放大模块包括输出端，所述输出端用于向电子设备输出工作电流；
    过流保护模块，所述过流保护模块连接于所述输出端，用于检测所述放大模块的温度，并根据所述温度控制所述工作电流大小，以使所述温度不高于第一预设温度阈值。
  2. 根据权利要求1所述的运算放大器，其中，所述过流保护模块包括至少一个分流电路，所述分流电路包括相互串联的第一电阻和控制开关，所述分流电路的一端连接于所述输出端，另一端接地；
    当所述温度不高于所述第一预设温度阈值时，所述控制开关均断开；当所述温度高于所述第一预设温度阈值时，至少一个所述控制开关导通，以减小所述工作电流。
  3. 根据权利要求2所述的运算放大器，其中，所述过流保护模块还包括检测电路、以及与所述检测电路连接的比较电路；
    所述检测电路用于向所述比较电路输入待比较电压，所述检测电路包括热敏元件，所述待比较电压为所述热敏元件的压降；
    当所述温度不高于所述第一预设温度阈值时，所述比较电路向每个所述控制开关均输入断开信号，以使所述控制开关均断开；当所述温度高于所述第一预设温度阈值时，所述比较电路向至少一个所述控制开关输入导通信号，以使至少一个所述控制开关导通。
  4. 根据权利要求3所述的运算放大器，其中，所述分流电路为至少两个；
    当所述温度高于所述第一预设温度阈值且不高于第二预设温度阈值时，所述比较电路向至少一个所述控制开关输入所述导通信号，并向至少一个所述控制开关输入断开信号；
    当所述温度高于所述第二预设温度阈值时，所述比较电路向每一所述控制开关均输入所述导通信号。
  5. 根据权利要求3所述的运算放大器，其中，所述检测电路还包括第二电阻，所述第二电阻的一端输入有预设电压，所述第二电阻的另一端与所述热敏元件的一端连接，所述热敏元件的另一端接地。
  6. 根据权利要求3所述的运算放大器，其中，所述热敏元件为正温度系数热敏电阻或负温度系数热敏电阻。
  7. 根据权利要求3所述的运算放大器，其中，所述控制开关为场效应管，所述比较电路与所述场效应管的栅极连接，所述导通信号为电压信号。
  8. 根据权利要求3所述的运算放大器，其中，所述比较电路为至少一个，所述比较电路与所述分流电路一一对应。
  9. 根据权利要求3所述的运算放大器，其中，所述比较电路包括至少一个电压比较器、以及与所述至少一个电压比较器连接的逻辑控制单元；
    所述检测电路连接于所述电压比较器，并向所述电压比较器输入所述待比较电压；
    每一所述电压比较器对应一预设参比电压，当所述待比较电压高于所述预设参比电压时，所述电压比较器向所述逻辑控制单元输入高电平信号，当所述待比较电压低于所述预设参比电压时，所述电压比较器向所述逻辑控制单元输入低电平信号；
    所述逻辑控制单元用于根据所述高电平信号和/或所述低电平信号，向所述控制开关输入所述导通信号和/或所述断开信号。
  10. 根据权利要求9所述的运算放大器，其中，所述过流保护模块包括两个分流电路，所述比较电路包括两个电压比较器，所述两个电压比较器分别对应第一预设参比电压和第二预设参比电压，所述第二预设参比电压大于所述第一预设参比电压；
    当所述待比较电压高于所述第二预设参比电压时，所述逻辑控制单元向两个所述控制开关输入所述导通信号；当所述待比较电压不高于所述第二预设参比电压且高于所述第一预设参比电压时，所述逻辑控制单元向任意一个所述控制开关输入所述导通信号，向另一个所述控制开关输入所述断开信号；当所述待比较电压不高于所述第一预设参比电压时，所述逻辑控制单元向两个所述控制开关输入所述断开信号。
  11. 一种显示装置，其包括运算放大器、以及与所述运算放大器连接的电子设备，所述电子设备为显示面板，
    所述运算放大器包括：
    放大模块，所述放大模块包括输出端，所述输出端用于向电子设备输出工作电流；
    过流保护模块，所述过流保护模块连接于所述输出端，用于检测所述放大模块的温度，并根据所述温度控制所述工作电流大小，以使所述温度不高于第一预设温度阈值。
  12. 根据权利要求11所述的显示装置，其中，所述过流保护模块包括至少一个分流电路，所述分流电路包括相互串联的第一电阻和控制开关，所述分流电路的一端连接于所述输出端，另一端接地；
    当所述温度不高于所述第一预设温度阈值时，所述控制开关均断开；当所述温度高于所述第一预设温度阈值时，至少一个所述控制开关导通，以减小所述工作电流。
  13. 根据权利要求12所述的显示装置，其中，所述过流保护模块还包括检测电路、以及与所述检测电路连接的比较电路；
    所述检测电路用于向所述比较电路输入待比较电压，所述检测电路包括热敏元件，所述待比较电压为所述热敏元件的压降；
    当所述温度不高于所述第一预设温度阈值时，所述比较电路向每个所述控制开关均输入断开信号，以使所述控制开关均断开；当所述温度高于所述第一预设温度阈值时，所述比较电路向至少一个所述控制开关输入导通信号，以使至少一个所述控制开关导通。
  14. 根据权利要求13所述的显示装置，其中，所述分流电路为至少两个；
    当所述温度高于所述第一预设温度阈值且不高于第二预设温度阈值时，所述比较电路向至少一个所述控制开关输入所述导通信号，并向至少一个所述控制开关输入断开信号；
    当所述温度高于所述第二预设温度阈值时，所述比较电路向每一所述控制开关均输入所述导通信号。
  15. 根据权利要求13所述的显示装置，其中，所述检测电路还包括第二电阻，所述第二电阻的一端输入有预设电压，所述第二电阻的另一端与所述热敏元件的一端连接，所述热敏元件的另一端接地。
  16. 根据权利要求13所述的显示装置，其中，所述热敏元件为正温度系数热敏电阻或负温度系数热敏电阻。
  17. 根据权利要求13所述的显示装置，其中，所述控制开关为场效应管，所述比较电路与所述场效应管的栅极连接，所述导通信号为电压信号。
  18. 根据权利要求13所述的显示装置，其中，所述比较电路为至少一个，所述比较电路与所述分流电路一一对应。
  19. 根据权利要求13所述的显示装置，其中，所述比较电路包括至少一个电压比较器、以及与所述至少一个电压比较器连接的逻辑控制单元；
    所述检测电路连接于所述电压比较器，并向所述电压比较器输入所述待比较电压；
    每一所述电压比较器对应一预设参比电压，当所述待比较电压高于所述预设参比电压时，所述电压比较器向所述逻辑控制单元输入高电平信号，当所述待比较电压低于所述预设参比电压时，所述电压比较器向所述逻辑控制单元输入低电平信号；
    所述逻辑控制单元用于根据所述高电平信号和/或所述低电平信号，向所述控制开关输入所述导通信号和/或所述断开信号。
  20. 根据权利要求19所述的显示装置，其中，所述过流保护模块包括两个分流电路，所述比较电路包括两个电压比较器，所述两个电压比较器分别对应第一预设参比电压和第二预设参比电压，所述第二预设参比电压大于所述第一预设参比电压；
    当所述待比较电压高于所述第二预设参比电压时，所述逻辑控制单元向两个所述控制开关输入所述导通信号；当所述待比较电压不高于所述第二预设参比电压且高于所述第一预设参比电压时，所述逻辑控制单元向任意一个所述控制开关输入所述导通信号，向另一个所述控制开关输入所述断开信号；当所述待比较电压不高于所述第一预设参比电压时，所述逻辑控制单元向两个所述控制开关输入所述断开信号。
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