CN110098811A - A kind of operational amplifier and display device - Google Patents
A kind of operational amplifier and display device Download PDFInfo
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- CN110098811A CN110098811A CN201910287052.4A CN201910287052A CN110098811A CN 110098811 A CN110098811 A CN 110098811A CN 201910287052 A CN201910287052 A CN 201910287052A CN 110098811 A CN110098811 A CN 110098811A
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Classifications
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- 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
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- 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
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- 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
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- 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
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- 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
Abstract
This application involves a kind of operational amplifier and display device, which includes: amplification module, and amplification module includes output end, and output end is used for electronic equipment output services electric current；Overcurrent protection module, overcurrent protection module are connected to output end, operating current size are controlled for detecting the temperature of amplification module, and according to temperature, so that temperature is not higher than the first preset temperature threshold.In this way, it can be avoided operational amplifier since electric current is excessive, cause temperature excessively high and damage.
Description
[technical field]
This application involves field of display technology, and in particular to a kind of operational amplifier and display device.
[background technique]
With becoming larger for liquid crystal display panel of thin film transistor size, display panel will appear horizontal crosstalk phenomenon, this
The display effect of phenomena impair picture and the grading of display panel.
In the prior art, usually using common electrode voltage compensation circuit as shown in Figure 1, operational amplifier is by connecing
The public electrode offset voltage Vcom_FB signal of display panel is received, and after being amplified, then be input to display through the end Vout
Panel itself couples the influence to public electrode voltages Vcom with compensating electric capacity, and then improves horizontal crosstalk phenomenon.
But requirement of this route to operational amplifier can be very high, especially for some pictures, such as heavy duty is drawn
Face, operational amplifier can be excessive due to electric current, and temperature is excessively high, and is easy to burn.
[summary of the invention]
The application's is designed to provide a kind of operational amplifier and display device, passes through setting overcurrent protection module, energy
The problem of enough avoiding operational amplifier since electric current is excessive, causing temperature excessively high and damage.
To solve the above-mentioned problems, the embodiment of the present application provides a kind of operational amplifier, which includes: to put
Big module, amplification module include output end, and output end is used for electronic equipment output services electric current；Overcurrent protection module, overcurrent
Protective module is connected to output end, operating current size is controlled for detecting the temperature of amplification module, and according to temperature, so that warm
Degree is not higher than the first preset temperature threshold.
Wherein, overcurrent protection module includes at least one shunt circuit, and shunt circuit includes the first resistor being serially connected
And control switch, one end of shunt circuit are connected to output end, other end ground connection；When temperature is not higher than the first preset temperature threshold
When, control switch disconnects；When temperature is higher than the first preset temperature threshold, at least one control switch conducting, to reduce work
Make electric current.
Wherein, overcurrent protection module further includes detection circuit and the comparison circuit that connect with detection circuit；Detection circuit
For inputting voltage to be compared to comparison circuit, detection circuit includes temperature-sensitive element, and voltage to be compared is the pressure drop of temperature-sensitive element；
When temperature is not higher than the first preset temperature threshold, comparison circuit inputs cut-off signal to each control switch, so that control
Switch disconnects；When temperature is higher than the first preset temperature threshold, comparison circuit inputs conducting letter at least one control switch
Number, so that at least one control switch is connected.
Wherein, shunt circuit at least two；When temperature is higher than the first preset temperature threshold and not higher than the second default temperature
When spending threshold value, comparison circuit inputs Continuity signal at least one control switch, and inputs and disconnect at least one control switch
Signal；When temperature is higher than the second preset temperature threshold, comparison circuit inputs Continuity signal to each control switch.
Wherein, detection circuit further includes second resistance, and one end input of second resistance has a predeterminated voltage, second resistance it is another
One end and one end of temperature-sensitive element connect, the other end ground connection of temperature-sensitive element.
Wherein, temperature-sensitive element is posive temperature coefficient thermistor or negative tempperature coefficient thermistor.
Wherein, control switch is field-effect tube, and the grid connection of comparison circuit and field-effect tube, Continuity signal is voltage letter
Number.
Wherein, comparison circuit includes at least one voltage comparator and patrols with what at least one voltage comparator was connect
Collect control unit；Detection circuit is connected to voltage comparator, and inputs voltage to be compared to voltage comparator；Each voltage compares
Device corresponds to a default reference voltage, and when voltage to be compared is higher than default reference voltage, voltage comparator is to logic control element
Input high level signal, when voltage to be compared is lower than default reference voltage, voltage comparator inputs low to logic control element
Level signal；Logic control element is used for according to high level signal and/or low level signal, inputs Continuity signal to control switch
And/or cut-off signal.
Wherein, overcurrent protection module includes two shunt circuits, and comparison circuit includes two voltage comparators, two voltages
Comparator respectively corresponds the first default reference voltage and the second default reference voltage, and it is default that the second default reference voltage is greater than first
Reference voltage；When voltage to be compared is higher than the second default reference voltage, logic control element is led to two control switch inputs
Messenger；When voltage to be compared is not higher than the second default reference voltage and is higher than the first default reference voltage, logic control list
Member inputs Continuity signal to any one control switch, inputs cut-off signal to another control switch；When voltage to be compared not
When higher than the first default reference voltage, logic control element inputs cut-off signal to two control switches.
To solve the above-mentioned problems, the embodiment of the present application also provides a kind of display device, which includes above-mentioned
The operational amplifier of any one and the electronic equipment connecting with operational amplifier, electronic equipment are display panel.
The beneficial effect of the application is: being different from the prior art, operational amplifier provided by the present application includes amplification module
And overcurrent protection module, wherein amplification module includes output end, and output end is used for electronic equipment output services electric current, overcurrent
Protective module is connected to output end, operating current size is controlled for detecting the temperature of amplification module, and according to temperature, so that warm
Degree causes temperature excessively high and damages not higher than the first preset temperature threshold to avoid operational amplifier since electric current is excessive.
[Detailed description of the invention]
In order to more clearly explain the technical solutions in the embodiments of the present application, make required in being described below to embodiment
Attached drawing is briefly described, it should be apparent that, the drawings in the following description are only some examples of the present application, for
For those skilled in the art, without creative efforts, it can also be obtained according to these attached drawings other attached
Figure.
Fig. 1 is the common electrode voltage compensation circuit diagram that the prior art provides；
Fig. 2 is the structural schematic diagram of operational amplifier provided by the embodiments of the present application；
Fig. 3 is another structural schematic diagram of operational amplifier provided by the embodiments of the present application；
Fig. 4 is another structural schematic diagram of operational amplifier provided by the embodiments of the present application；
Fig. 5 is the structural schematic diagram of comparison circuit in Fig. 4；
Fig. 6 is another structural schematic diagram of operational amplifier provided by the embodiments of the present application；
Fig. 7 is the structural schematic diagram of display device provided by the embodiments of the present application.
[specific embodiment]
With reference to the accompanying drawings and examples, the application is described in further detail.It is emphasized that following implement
Example is merely to illustrate the application, but is not defined to scope of the present application.Likewise, following embodiment is only the portion of the application
Point embodiment and not all embodiments, institute obtained by those of ordinary skill in the art without making creative efforts
There are other embodiments, shall fall in the protection scope of this application.
Since requirement of the pixel common electrode voltage compensation circuit to operational amplifier is very high in display device, especially
For some pictures, such as heavily loaded picture, operational amplifier can be excessive due to electric current, and temperature is excessively high, and is easy to burn.On solving
Technical problem is stated, the application in operational amplifier the technical solution adopted is that by being arranged overcurrent protection module, to avoid fortune
Amplifier is calculated since electric current is excessive, the problem of causing temperature excessively high and damage.
Referring to Fig. 2, Fig. 2 is the structural schematic diagram of operational amplifier provided by the embodiments of the present application.As shown in Fig. 2, fortune
Calculating amplifier 20 includes amplification module 21 and overcurrent protection module 22.Wherein, amplification module 21 includes output end 211, output end
211 are used for 30 output services electric current of electronic equipment.Overcurrent protection module 22 is connected to output end 211, for detecting amplification mould
The temperature of block 21, and operating current size is controlled according to temperature, so that temperature is not higher than the first preset temperature threshold, and then avoid
Operational amplifier 20 is damaged because temperature is excessively high.
Wherein, amplification module 21 further includes input terminal (not shown), and input terminal is signal to be amplified for receiving.Amplification
Module 21 to this it is signal to be amplified amplify after, amplified signal is exported to electronic equipment 30 by output end 211, with to
30 output services electric current of electronic equipment.
In one embodiment, as shown in figure 3, overcurrent protection module 22 includes at least one shunt circuit 221, electricity is shunted
Road 221 includes the first resistor R1 and control switch S1 being serially connected, and one end of shunt circuit 221 is connected to output end 211, separately
One end ground connection.When the temperature of amplification module 21 is not higher than the first preset temperature threshold, control switch S1 is disconnected.When amplification mould
When the temperature of block 21 is higher than the first preset temperature threshold, at least one control switch S1 conducting to reduce operating current, and then makes
The temperature for obtaining amplification module 21 is not higher than the first preset temperature threshold.
For example, overcurrent protection module 22 includes three shunt circuits 221 with continued reference to Fig. 3.When temperature is pre- not higher than first
If when temperature threshold, the control switch S1 of three shunt circuits 221 is disconnected, i.e. overcurrent protection module 22 is defeated to output end 211
Out to the operating current of electronic equipment 30 without influence.When temperature is higher than the first preset temperature threshold and is not higher than the second preset temperature
When threshold value, the control switch S1 of only one shunt circuit 221 is connected, so that the first resistor R1 of the shunt circuit 221 and electricity
Sub- equipment 30 is in parallel, to reduce the operating current of the output of output end 211 to electronic equipment 30 to a certain extent.When temperature is higher than
Second preset temperature threshold and when being not higher than third preset temperature threshold, only leads there are two the control switch S1 of shunt circuit 221
It is logical, so that the first resistor R1 of the two shunt circuits 221 is in parallel with electronic equipment 30, largely to reduce output end
211 export to the operating current of electronic equipment 30.When temperature is higher than third preset temperature threshold, three shunt circuits 221
Control switch S1 is both turned on, so that the first resistor R1 of three shunt circuits 221 is in parallel with electronic equipment 30, in maximum journey
Reduce the operating current of the output of output end 211 to electronic equipment 30 on degree.Wherein, the first preset temperature threshold is default less than second
Temperature threshold, the second preset temperature threshold are less than third preset temperature threshold.In this way, by the way that multiple temperature ranges are arranged to output
The operating current of end 211 output to electronic equipment 30 is reduced to some extent, so that the temperature of amplification module 21 is not high
In the first preset temperature threshold, is conducive to improve rate of temperature fall and reduces power consumption.
In a specific embodiment, as shown in figure 4, overcurrent protection module 22 further include detection circuit 222 and with inspection
The comparison circuit 223 that slowdown monitoring circuit 222 connects.Wherein, detection circuit 222 is used to input voltage VA to be compared to comparison circuit 223,
Detection circuit 222 includes temperature-sensitive element P, and voltage VA to be compared is the pressure drop of temperature-sensitive element P.When the temperature of amplification module 21 is not high
When the first preset temperature threshold, comparison circuit 223 inputs cut-off signal to each control switch S1, so that control switch S1
Disconnect.When the temperature of amplification module 21 is higher than the first preset temperature threshold, comparison circuit 223 is at least one control switch
S1 inputs Continuity signal, so that at least one control switch S1 is connected.
Optionally, as shown in figure 4, detection circuit 222 further includes second resistance R2, one end input of second resistance R2 has pre-
If voltage V1, the other end of second resistance R2 is connect with one end of temperature-sensitive element P, the other end ground connection of temperature-sensitive element P.
Wherein, temperature-sensitive element P can be posive temperature coefficient thermistor or negative tempperature coefficient thermistor.If temperature-sensitive element
P is posive temperature coefficient thermistor, then when the temperature of amplification module 21 is not higher than the first preset temperature threshold, voltage to be compared
VA is not more than the first default reference voltage Vref1, to be compared when the temperature of amplification module 21 is higher than the first preset temperature threshold
Voltage VA is greater than the first default reference voltage Vref1.If temperature-sensitive element p is negative tempperature coefficient thermistor, work as amplification module
When 21 temperature is not higher than the first preset temperature threshold, voltage VA to be compared is not less than the first default reference voltage Vref1, when putting
When the temperature of big module 21 is higher than the first preset temperature threshold, voltage VA to be compared reference voltage Vref1 default less than first.
For example, shunt circuit 221 is at least two with continued reference to Fig. 4, temperature-sensitive element P is posive temperature coefficient thermistor,
First default reference voltage Vref1 reference voltage Vref2 default less than second.When the temperature of amplification module 21 is pre- not higher than first
If when temperature threshold, voltage VA to be compared is not more than the first default reference voltage Vref1, comparison circuit 223 is opened to each control
It closes S1 and inputs cut-off signal.When the temperature of amplification module 21 is higher than the first preset temperature threshold and is not higher than the second preset temperature
When threshold value, voltage VA to be compared is greater than the first default reference voltage Vref1 and is not more than the second default reference voltage Vref2, than
Continuity signal is inputted at least one control switch S1 compared with circuit 223, and inputs cut-off signal at least one control switch S1.
When the temperature of amplification module 21 is higher than the second preset temperature threshold, voltage VA to be compared is greater than the first default reference voltage
Vref2, comparison circuit 223 input Continuity signal to each control switch S1.
Wherein, control switch S1 can be field-effect tube, for example, metal-oxide-semiconductor, the grid of comparison circuit 223 and field-effect tube S1
Pole G connection, above-mentioned Continuity signal is voltage signal, and threshold value of the corresponding voltage value of the voltage signal greater than field-effect tube S1 is electric
Pressure, accordingly, above-mentioned cut-off signal is also voltage signal, and the corresponding voltage value of the voltage signal is less than the threshold of field-effect tube S1
Threshold voltage.
Optionally, it as shown in figure 4, comparison circuit 223 is at least one, and is corresponded with shunt circuit 221.Specifically
Ground, as shown in figure 5, comparison circuit 223 includes the first circuit 2231 and comparator 2232, the first circuit 2231 includes 3rd resistor
One end input of R3 and the 4th resistance R4,3rd resistor R3 have predeterminated voltage V2, the other end of 3rd resistor R3 and the 4th resistance
One end of R4 connects, the other end ground connection of the 4th resistance R4, the above-mentioned first default default reference electricity of reference voltage Vref1 or second
Pressing Vref2 is the pressure drop Vref of the 4th resistance R4, and according to Ohm's law, Vref=V2*R4/ (R3+R4).The first different electricity
Road 223 provides different default reference voltage Vref to corresponding comparator 2232, when voltage VA to be compared is greater than Vref, than
Continuity signal is inputted compared with control switch S1 of the device 2232 into corresponding shunt circuit 221, when voltage VA to be compared is no more than pre-
If when reference voltage Vref, control switch S1 of the comparator 2232 into corresponding shunt circuit 221 inputs cut-off signal.
Further, above-mentioned first preset temperature threshold is corresponded to each other with the pressure drop of the 4th resistance R4.For example, in default electricity
Under conditions of pressing V2 certain, by the relative size for changing 3rd resistor R3 and the 4th resistance R4, thus it is possible to vary the 4th resistance R4
Pressure drop, corresponding first preset temperature threshold can also change.In another example the 4th resistance R4 can be adjustable resistance, Ji Ketong
The artificial size for adjusting the 4th resistance R4 is crossed, to adjust the size of above-mentioned first preset temperature threshold.
For example, the first preset temperature threshold if desired set as 60 DEG C, then needs first to obtain detection circuit 222 at 60 DEG C
Under the conditions of the voltage VA to be compared that exports, then by adjusting the third electricity of the first circuit 2231 of corresponding comparison circuit 223
The size of R3 or the 4th resistance R4 is hindered, so that the pressure drop of the 4th resistance R4 is equal to the voltage VA to be compared under the conditions of 60 DEG C.In this way,
When the operating temperature of amplification module 21 is higher than 60 DEG C, corresponding voltage VA to be compared can be greater than the first default reference voltage
Vref1, comparator 2232 inputs Continuity signal at least one control switch S1, to reduce operating current, so that amplification
The temperature of module 21 is not higher than 60 DEG C.
In another specific embodiment, as shown in fig. 6, comparison circuit 223 include at least one voltage comparator 2233,
And the logic control element 2234 being connect at least one described voltage comparator 2233.Detection circuit 222 is connected to voltage
Comparator 2233, and voltage VA to be compared is inputted to voltage comparator 2233.The default ginseng of each voltage comparator 2233 corresponding one
Than voltage, when the high VA of voltage to be compared is when default reference voltage, voltage comparator 2233 is inputted to logic control element 2234
High level signal, when voltage VA to be compared is lower than default reference voltage, voltage comparator 2233 is to logic control element 2234
Input low level signal.Logic control element 2234 is used for according to high level signal and/or low level signal, to control switch S1
Input Continuity signal and/or cut-off signal.
Wherein, high level signal is logic level " 1 ", and low level signal is logic level " 0 ".Logic control element 2234
According to the quantity for receiving " 1 " and/or " 0 ", Continuity signal and/or cut-off signal are inputted to control switch S1, and receive
" 1 " is more, and the control switch S1 of conducting is more.
For example, overcurrent protection module 22 includes two shunt circuits 221 with continued reference to Fig. 6, comparison circuit 223 includes two
A voltage comparator 2233, two voltage comparators 2233 respectively correspond the default ginseng of the first default reference voltage Vref1 and second
Than voltage Vref2, the second default reference voltage Vref2 is greater than the first default reference voltage Vref1.When voltage VA to be compared is higher than
When the second default reference voltage Vref2, the A0 and A1 that comparator 2233 exports are " 1 ", and logic control element 2234 is to two
Control switch S1 inputs Continuity signal.When voltage VA to be compared not higher than the second default reference voltage Vref2 and is higher than first in advance
If when reference voltage Vref1, the position A0 " 1 " that comparator 2233 exports, A1 is " 0 ", logic control element 2234 is to any one
A control switch S1 inputs Continuity signal, inputs cut-off signal to another control switch S1.When voltage VA to be compared is not higher than
When the first default reference voltage Vref1, the A0 and A1 that comparator 2233 exports are " 0 ", and logic control element is controlled to two
Switch input cut-off signal.
It is different from the prior art, operational amplifier provided by the present application includes amplification module and overcurrent protection module, wherein
Amplification module includes output end, and output end is used for electronic equipment output services electric current, and overcurrent protection module is connected to output end,
Operating current size is controlled for detecting the temperature of amplification module, and according to temperature, so that temperature is not higher than the first preset temperature
Threshold value causes temperature excessively high and damages to avoid operational amplifier since electric current is excessive.
Referring to Fig. 7, Fig. 7 is the structural schematic diagram of display device provided by the embodiments of the present application.As shown in fig. 7, this is aobvious
The operational amplifier 71 of showing device 70 including any of the above-described embodiment and the electronic equipment 72 connect with operational amplifier, it is electric
Sub- equipment 72 is display panel.
Specifically, operational amplifier 71 includes amplification module and overcurrent protection module, wherein amplification module includes output
End, output end are used for 72 output services electric current of display panel, and overcurrent protection module is connected to output end, for detecting amplification mould
The temperature of block, and operating current size is controlled according to temperature, so that the temperature of amplification module is not higher than the first preset temperature threshold.
In one embodiment, amplification module further includes two input terminals, wherein an input terminal is to be entered for receiving
The public electrode voltages signal of display panel 72, another input terminal is for receiving public electrode compensation voltage signal.Also, it is public
After common electrode compensation voltage signal is amplified by amplification module, export by the output end of amplification module to display panel 72
Pixel public electrode, influence to above-mentioned public electrode voltages signal is coupled with compensating electric capacity and above-mentioned operating current is provided,
And then avoid display panel 72 that horizontal crosstalk occurs.
It is different from the prior art, display device provided by the present application, operational amplifier includes amplification module and overcurrent protection
Module, wherein amplification module includes output end, and output end is used for display panel output services electric current, and overcurrent protection module connects
It is connected to output end, controls operating current size for detecting the temperature of amplification module, and according to temperature, so that temperature is not higher than the
One preset temperature threshold causes temperature excessively high and damages to avoid operational amplifier since electric current is excessive.
The foregoing is merely the preferred embodiments of the application, not to limit the application, all essences in the application
Made any modifications, equivalent replacements, and improvements etc., should be included within the scope of protection of this application within mind and principle.
Claims (10)
1. a kind of operational amplifier characterized by comprising
Amplification module, the amplification module include output end, and the output end is used for electronic equipment output services electric current；
Overcurrent protection module, the overcurrent protection module are connected to the output end, for detecting the temperature of the amplification module,
And the operating current size is controlled according to the temperature, so that the temperature is not higher than the first preset temperature threshold.
2. operational amplifier according to claim 1, which is characterized in that the overcurrent protection module includes at least one point
Current circuit, the shunt circuit include the first resistor and control switch being serially connected, and one end of the shunt circuit is connected to
The output end, other end ground connection；
When the temperature is not higher than first preset temperature threshold, the control switch is disconnected；When the temperature is higher than
When first preset temperature threshold, at least one described control switch conducting, to reduce the operating current.
3. operational amplifier according to claim 2, which is characterized in that the overcurrent protection module further includes detection electricity
Road and the comparison circuit being connect with the detection circuit；
The detection circuit is used to input voltage to be compared to the comparison circuit, and the detection circuit includes temperature-sensitive element, institute
State the pressure drop that voltage to be compared is the temperature-sensitive element；
When the temperature is not higher than first preset temperature threshold, the comparison circuit is defeated to each control switch
Enter cut-off signal, so that the control switch disconnects；When the temperature is higher than first preset temperature threshold, the ratio
Continuity signal is inputted to control switch described at least one compared with circuit, so that at least one described control switch conducting.
4. operational amplifier according to claim 3, which is characterized in that the shunt circuit is at least two；
When the temperature is higher than first preset temperature threshold and is not higher than the second preset temperature threshold, the comparison circuit
The Continuity signal is inputted to control switch described at least one, and inputs cut-off signal to control switch described at least one；
When the temperature is higher than second preset temperature threshold, the comparison circuit is inputted to each control switch
The Continuity signal.
5. display panel according to claim 3, which is characterized in that the detection circuit further includes second resistance, described
One end input of second resistance has predeterminated voltage, and the other end of the second resistance is connect with one end of the temperature-sensitive element, institute
State the other end ground connection of temperature-sensitive element.
6. display panel according to claim 3, which is characterized in that the temperature-sensitive element is posive temperature coefficient thermistor
Or negative tempperature coefficient thermistor.
7. display panel according to claim 3, which is characterized in that the control switch is field-effect tube, the comparison
Circuit is connect with the grid of the field-effect tube, and the Continuity signal is voltage signal.
8. operational amplifier according to claim 3, which is characterized in that the comparison circuit includes at least one voltage ratio
Compared with device and the logic control element being connect at least one described voltage comparator；
The detection circuit is connected to the voltage comparator, and inputs the voltage to be compared to the voltage comparator；
Each corresponding default reference voltage of the voltage comparator, when the voltage to be compared is higher than the default reference voltage
When, the voltage comparator is to the logic control element input high level signal, when the voltage to be compared is lower than described pre-
If when reference voltage, the voltage comparator is to the logic control element input low level signal；
The logic control element is used for according to the high level signal and/or the low level signal, Xiang Suoshu control switch
Input the Continuity signal and/or the cut-off signal.
9. operational amplifier according to claim 8, which is characterized in that the overcurrent protection module includes two shunting electricity
Road, the comparison circuit include two voltage comparators, and described two voltage comparators respectively correspond the first default reference voltage
With the second default reference voltage, the second default reference voltage is greater than the described first default reference voltage；
When the voltage to be compared is higher than the second default reference voltage, the logic control element is to two controls
Switch inputs the Continuity signal；When the voltage to be compared not higher than the described second default reference voltage and is higher than described first
When default reference voltage, the logic control element inputs the Continuity signal to any one of control switch, to another
A control switch inputs the cut-off signal；When the voltage to be compared is not higher than the first default reference voltage,
The logic control element inputs the cut-off signal to two control switches.
10. a kind of display device, which is characterized in that the display device includes such as the described in any item operations of claim 1-9
Amplifier and the electronic equipment connecting with the operational amplifier, the electronic equipment are display panel.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910287052.4A CN110098811A (en) | 2019-04-11 | 2019-04-11 | A kind of operational amplifier and display device |
| PCT/CN2019/086829 WO2020206802A1 (en) | 2019-04-11 | 2019-05-14 | Operational amplifier and display device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910287052.4A CN110098811A (en) | 2019-04-11 | 2019-04-11 | A kind of operational amplifier and display device |
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| Publication Number | Publication Date |
|---|---|
| CN110098811A true CN110098811A (en) | 2019-08-06 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910287052.4A Pending CN110098811A (en) | 2019-04-11 | 2019-04-11 | A kind of operational amplifier and display device |
Country Status (2)
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|---|---|
| CN (1) | CN110098811A (en) |
| WO (1) | WO2020206802A1 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110796989A (en) * | 2019-11-08 | 2020-02-14 | 广州小鹏汽车科技有限公司 | Control circuit of display screen, display screen and vehicle |
| CN113630093A (en) * | 2020-05-09 | 2021-11-09 | 博通集成电路（上海）股份有限公司 | Power amplifier and overcurrent protection circuit |
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| CN206365081U (en) * | 2016-12-17 | 2017-07-28 | 北京银星通达科技开发有限责任公司 | A kind of resistance self-regulation circuit |
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| CN101470142B (en) * | 2007-12-27 | 2011-03-09 | 英业达股份有限公司 | Overcurrent detection circuit, decompression converter and overcurrent detection method |
| CN102740567B (en) * | 2012-07-04 | 2014-10-29 | 深圳市华星光电技术有限公司 | LED (light-emitting diode) backlight driving circuit, backlight module and liquid crystal display device |
| CN108010497A (en) * | 2017-11-27 | 2018-05-08 | 深圳市华星光电技术有限公司 | A kind of liquid crystal display and its over-current protection method |
| CN108377137A (en) * | 2018-05-07 | 2018-08-07 | 贵州大学 | A kind of high-power integrated operational amplifier |
| CN108832900A (en) * | 2018-05-31 | 2018-11-16 | 北京集创北方科技股份有限公司 | Operational amplification circuit and its over-current protection method |
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2019
- 2019-04-11 CN CN201910287052.4A patent/CN110098811A/en active Pending
- 2019-05-14 WO PCT/CN2019/086829 patent/WO2020206802A1/en active Application Filing
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| CN1052232A (en) * | 1989-11-28 | 1991-06-12 | 汤姆森消费电子有限公司 | Switching device with cascaded switch sections |
| CN106535391A (en) * | 2016-10-11 | 2017-03-22 | 昆山龙腾光电有限公司 | Peak current absorption circuit and control method thereof and light-emitting diode drive device |
| CN206365081U (en) * | 2016-12-17 | 2017-07-28 | 北京银星通达科技开发有限责任公司 | A kind of resistance self-regulation circuit |
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| CN110796989A (en) * | 2019-11-08 | 2020-02-14 | 广州小鹏汽车科技有限公司 | Control circuit of display screen, display screen and vehicle |
| CN113630093A (en) * | 2020-05-09 | 2021-11-09 | 博通集成电路（上海）股份有限公司 | Power amplifier and overcurrent protection circuit |
| CN113630093B (en) * | 2020-05-09 | 2023-07-18 | 博通集成电路（上海）股份有限公司 | Power amplifier and overcurrent protection circuit |
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|---|---|
| WO2020206802A1 (en) | 2020-10-15 |
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