CN108303581A - GOA circuits and GOA circuit overcurrent protection method for detecting - Google Patents
GOA circuits and GOA circuit overcurrent protection method for detecting Download PDFInfo
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- CN108303581A CN108303581A CN201810100043.5A CN201810100043A CN108303581A CN 108303581 A CN108303581 A CN 108303581A CN 201810100043 A CN201810100043 A CN 201810100043A CN 108303581 A CN108303581 A CN 108303581A
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- 230000009286 beneficial effect Effects 0.000 abstract description 3
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/165—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values
- G01R19/16566—Circuits and arrangements for comparing voltage or current with one or several thresholds and for indicating the result not covered by subgroups G01R19/16504, G01R19/16528, G01R19/16533
- G01R19/16576—Circuits and arrangements for comparing voltage or current with one or several thresholds and for indicating the result not covered by subgroups G01R19/16504, G01R19/16528, G01R19/16533 comparing DC or AC voltage with one threshold
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H1/00—Details of emergency protective circuit arrangements
- H02H1/0007—Details of emergency protective circuit arrangements concerning the detecting means
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- Control Of Indicators Other Than Cathode Ray Tubes (AREA)
- Liquid Crystal Display Device Control (AREA)
- Emergency Protection Circuit Devices (AREA)
Abstract
The present invention provides a kind of GOA circuits overcurrent protection method for detecting; for judging whether the electric current of input display panel meets overcurrent protection unlocking condition; GOA circuits include level shifting circuit, and level shifting circuit includes current integration circuit and connects the first comparator of current integration circuit；After current integration circuit is to the electric current amplifier of input, comparison voltage is inputted to the first input end of first comparator；To the second input terminal input reference voltage of first comparator；After first comparator is compared processing to the voltage value of comparison voltage and reference voltage, whether output starts the control signal of overcurrent protection；It has the beneficial effect that：The overcurrent protection method for detecting of GOA circuits provided by the invention; detecting module is added in level shifting circuit; comparison voltage is exported according to the electric current amplifier of input; the comparison voltage of output and the reference voltage of setting are exported to control signal more afterwards, the overcurrent protection to being not required to transient high-current to be protected can be excluded.
Description
Technical field
The present invention relates to display actuation techniques field more particularly to a kind of GOA circuits and GOA circuit overcurrent protections detecting sides
Method.
Background technology
GOA is more and more used on the driving framework of TFT-LCD (Thin Film Transistors-LCD display panel) at present
The design of (Gate On Array, array substrate row actuation techniques) leads to Gate grid control circuit functions on liquid crystal display panel
TFT circuit realization is crossed, to effectively reduce design cost.But there is its safety problem with what is occurred with GOA technologies, because
GOA signal voltage values are very big, so when, there are when short circuit problem, GOA control signal codes can increase, being caused in array substrate
Short dot temperature is excessively high on panel, or even has the risk of molten screen to be protected to unusual condition so needing a kind of detecting mechanism
Shield.
Current each Level shift IC (level shifting circuit) manufacturer generally uses instantaneous value detection techniques, by detecing
It surveys some time point or period GOA signal code value size judges whether to have reached trigger condition, to be protected.
But there are an apparent technological deficiencies for this technology, because the Data (data line) in array substrate and Gate (grid line)
Couple (coupling) effect, GOA signals may have certain transient high-current phenomenons, and then trigger IC OCP (Over
Current Protection, current foldback circuit) protection；And practical such transient high-current can't be in array substrate
Regular event generates any influence, belongs to false triggering.
In conclusion mechanism is detected in overcurrent protection in existing GOA circuits, some time point or period are being detected
When GOA signal values, may be by the transient high-current erroneous judgement for coupling formation between the data and Gate in array substrate
Flow phenomenon further triggers overcurrent protection, and display pixel may be caused under-voltage defect occur.
Invention content
The present invention provides a kind of GOA circuits overcurrent protection method for detecting, and detecting module, root are added in level shifting circuit
Comparison voltage is exported according to the electric current amplifier of input, the comparison voltage of output and the reference voltage of setting are exported into control letter more afterwards
Number, to exclude the overcurrent protection to being not required to transient high-current to be protected, reduce overcurrent protection false triggering probability.
To solve the above problems, technical solution provided by the invention is as follows：
The present invention provides a kind of GOA circuits overcurrent protection method for detecting, for judge input display panel electric current whether
Meet overcurrent protection unlocking condition, the GOA circuits include level shifting circuit, and the level shifting circuit includes current integration
The voltage value of the first comparator of circuit and the connection current integration circuit, the current integration circuit output is electric current
To the integral of time；The method includes：
S 10, after the current integration circuit is to the electric current amplifier of input, to the first input end of the first comparator
Input comparison voltage.
S20 obtains the first reference voltage and the second reference voltage.
S30, to the second input terminal input reference voltage of the first comparator, wherein the voltage of the reference voltage
Value is set as between first reference voltage and second reference voltage.
S40, after the first comparator is compared processing to the voltage value of the comparison voltage and the reference voltage,
Whether output starts the control signal of overcurrent protection.
According to one preferred embodiment of the present invention, in the S 10, the current integration circuit includes the second comparator, resistance
And capacitance, the input terminal of the resistance access current signal, the output end of the resistance connects the anti-of second comparator
To input terminal, the first connecting pin of the capacitance connects the output end of the resistance, and the second connection end of the capacitance connects institute
State the output end of the second comparator, the positive input ground connection of second comparator.
According to one preferred embodiment of the present invention, the comparison of the electric current and output of the current integration circuit input
Relationship between voltage is：
Wherein, I is the electric current, and Vo is the comparison voltage.
According to one preferred embodiment of the present invention, the first input end of the first comparator is inverse output terminal, described the
Second input terminal of one comparator is positive output end；The output end of second comparator connects the anti-of the first input end
To output end, the positive output end of the first comparator accesses reference voltage signal.
According to one preferred embodiment of the present invention, the S20 includes：
S201 obtains the oscillogram of the first electric current, and the oscillogram of first electric current is to need the exception of overcurrent protection electric
Road waveform, the oscillogram include the Y-coordinate axle for representing current value and the X-coordinate axle for representing the time, the wave of first electric current
First area is formed between shape and the Y-coordinate axle and the X-coordinate axle, the area of the first area is first electric current
To the integral of time, the integral of first Current versus time is the output voltage of the current integration circuit, by described the
The output voltage setting of the corresponding current integration circuit of area in one region is the first reference voltage.
S202 obtains the oscillogram of the second electric current, and the oscillogram of second electric current is not need the exception of overcurrent protection
Circuit waveform, the oscillogram include the Y-coordinate axle for representing current value and the X-coordinate axle for representing the time, second electric current
Second area is formed between waveform and the Y-coordinate axle and the X-coordinate axle, the area of the second area is second electricity
The integral to the time is flowed, the integral of second Current versus time is the output voltage of the current integration circuit, will be described
The output voltage setting of the corresponding current integration circuit of area of second area is the second reference voltage.
According to one preferred embodiment of the present invention, in the S30, the voltage value of first reference voltage is more than described second
The voltage value of reference voltage；The voltage value of the reference voltage is less than the voltage value of first reference voltage, and more than described
The voltage value of second reference voltage.
According to one preferred embodiment of the present invention, when the voltage value of the comparison voltage is more than the voltage value of the reference voltage
When, the first comparator output starts the control signal of overcurrent protection.
Above-mentioned purpose according to the present invention provides a kind of GOA circuits, and the GOA circuits include level shifting circuit, described
Level shifting circuit includes：
Current integration circuit, for after the electric current amplifier that will input, output comparison voltage；
First connecting pin of first comparator, the first comparator connects the output end of the current integration circuit to connect
The comparison voltage is received, the second connection end of the first comparator accesses reference voltage；
Wherein, the first comparator is compared processing to the voltage value of the comparison voltage and the reference voltage
Afterwards, whether output starts the control signal of overcurrent protection.
According to one preferred embodiment of the present invention, the current integration circuit includes the second comparator, resistance and capacitance, institute
The input terminal access current signal of resistance is stated, the output end of the resistance connects the reverse input end of second comparator, institute
The first connecting pin for stating capacitance connects the output end of the resistance, and the second connection end of the capacitance connects second comparator
Output end, second comparator positive input ground connection.
According to one preferred embodiment of the present invention, the comparison of the electric current and output of the current integration circuit input
Relationship between voltage is：
Wherein, I is the electric current, and Vo is the comparison voltage.
Beneficial effects of the present invention are：It is provided by the invention compared with the current foldback circuit of the GOA circuits of the prior art
The overcurrent protection method for detecting of GOA circuits and GOA circuits, adds detecting module in level shifting circuit, according to the electricity of input
It flows amplifier and exports comparison voltage, the comparison voltage of output and the reference voltage of setting are exported into control signal more afterwards, can be excluded
To being not required to the overcurrent protection of transient high-current to be protected, reduce overcurrent protection false triggering probability；To solve existing GOA circuits
In overcurrent protection detect mechanism, may will be in array substrate when detecting the GOA signal values of some time point or period
Data and Gate between couple formation transient high-current erroneous judgement be over-current phenomenon avoidance, further trigger overcurrent protection, may
Display pixel is caused the technical issues of under-voltage defect occur.
Description of the drawings
It, below will be to embodiment or the prior art in order to illustrate more clearly of embodiment or technical solution in the prior art
Attached drawing needed in description is briefly described, it should be apparent that, the accompanying drawings in the following description is only some invented
Embodiment for those of ordinary skill in the art without creative efforts, can also be attached according to these
Figure obtains other attached drawings.
Fig. 1 is GOA circuits overcurrent protection method for detecting flow chart of the present invention.
Fig. 2 a are the normal GOA current waveform signals schematic diagram for being not required to protection；
Fig. 2 b are to need GOA current waveform signals schematic diagram to be protected；
Fig. 2 c are the abnormal GOA current waveform signals schematic diagram for being not required to protection；
Fig. 3 is GOA circuit structure schematic diagram provided by the invention.
Specific implementation mode
The explanation of following embodiment is referred to the additional illustration, to illustrate the present invention can be used to implement particular implementation
Example.The direction term that the present invention is previously mentioned, such as [on], [under], [preceding], [rear], [left side], [right side], [interior], [outer], [side]
Deng being only the direction with reference to annexed drawings.Therefore, the direction term used be illustrate and understand the present invention, rather than to
The limitation present invention.The similar unit of structure is with being given the same reference numerals in the figure.
The present invention is directed to the overcurrent protection in existing GOA circuits and detects mechanism, is detecting some time point or period
GOA signal values when, may be by the transient high-current erroneous judgement for coupling formation between the data and Gate in array substrate
Over-current phenomenon avoidance further triggers overcurrent protection, and display pixel may be caused the technical issues of under-voltage defect, the present embodiment energy occur
Enough solve the defect.
As shown in Figure 1, the present invention provides a kind of GOA circuits overcurrent protection method for detecting, for judging input display panel
Electric current whether meet overcurrent protection unlocking condition, the GOA circuits include level shifting circuit, the level shifting circuit packet
Include the first comparator of current integration circuit and the connection current integration circuit, the electricity of the current integration circuit output
Pressure value is the integral of Current versus time；The overcurrent protection method for detecting includes：
S 10, after the current integration circuit is to the electric current amplifier of input, to the first input end of the first comparator
Input comparison voltage.
S20 obtains the first reference voltage and the second reference voltage.
S30, to the second input terminal input reference voltage of the first comparator, wherein the voltage of the reference voltage
Value is set as between first reference voltage and second reference voltage.
S40, after the first comparator is compared processing to the voltage value of the comparison voltage and the reference voltage,
Whether output starts the control signal of overcurrent protection.
In the S 10, the current integration circuit include the second comparator, resistance and capacitance, the resistance it is defeated
Entering and terminates into current signal, the output end of the resistance connects the reverse input end of second comparator, and the of the capacitance
One connecting pin connects the output end of the resistance, and the second connection end of the capacitance connects the output end of second comparator,
The positive input of second comparator is grounded.
The first input end of the first comparator is inverse output terminal, and the second input terminal of the first comparator is just
To output end；The output end of second comparator connects the inverse output terminal of the first input end, the first comparator
Positive output end access reference voltage signal.
Relationship between the electric current and the comparison voltage of output of current integration circuit input is：Wherein, I is the electric current, and Vo is the comparison voltage；It can be according to input current meter by the integral formula
Calculate comparison voltage.
In the prior art, overcurrent protection can be started when overcurrent protection detects high current, however, part abnormal circuit
High current be transient current, the circuit of display panel will not be impacted, when high current continues longer in abnormal circuit
Between then display panel circuit can be caused to damage.
As shown in Figure 2 a, it is normal GOA current waveform signals schematic diagram；Figure includes the Y coordinate for indicating current value size
The wavy line that the value of axis, the X-coordinate axle for indicating current duration and electric current changes over time, the wavy line are sat with the X
Shadow region is formed between parameter and the Y-coordinate axle, which is area and Current versus time of the electric current to reference axis
Integral.
The initial time of GOA electric currents is larger in the figure, is then reduced with speed quickly, shaded area is relatively small, no
It needs to start overcurrent protection.
As shown in Figure 2 b, to need the GOA current waveform signal schematic diagrames of overcurrent protection；Figure includes indicating that current value is big
The wavy line that small Y-coordinate axle, the X-coordinate axle of expression current duration and the value of electric current changes over time, the wavy line
Shadow region is formed between the X-coordinate axle and the Y-coordinate axle, which is area of the electric current to reference axis, and
The integral of Current versus time.
The duration of GOA high currents is longer in the figure, and shaded area is relatively large.
As shown in Figure 2 c, not need the abnormal GOA current waveform signals schematic diagram of overcurrent protection；Figure includes indicating electricity
The wavy line that the value of the Y-coordinate axle of flow valuve size, the X-coordinate axle for indicating current duration and electric current changes over time, should
Shadow region is formed between wavy line and the X-coordinate axle and the Y-coordinate axle, which is face of the electric current to reference axis
The integral of product and Current versus time.
Moment GOA high current is shown as in the figure, and the high current duration is extremely short, and shaded area is with respect to Fig. 1 shaded areas
It is larger and close with Fig. 1 shaded areas, and opposite Fig. 2 shaded areas are smaller, therefore do not need overcurrent protection.
Specifically, the S20 includes：
S201 obtains the oscillogram of the first electric current, and the oscillogram of first electric current is to need the exception of overcurrent protection electric
Road waveform, the oscillogram include the Y-coordinate axle for representing current value and the X-coordinate axle for representing the time, the wave of first electric current
First area is formed between shape and the Y-coordinate axle and the X-coordinate axle, the area of the first area is first electric current
To the integral of time, the integral of first Current versus time is the output voltage of the current integration circuit, by described the
The output voltage setting of the corresponding current integration circuit of area in one region is the first reference voltage.
S202 obtains the oscillogram of the second electric current, and the oscillogram of second electric current is not need the exception of overcurrent protection
Circuit waveform, the oscillogram include the Y-coordinate axle for representing current value and the X-coordinate axle for representing the time, second electric current
Second area is formed between waveform and the Y-coordinate axle and the X-coordinate axle, the area of the second area is second electricity
The integral to the time is flowed, the integral of second Current versus time is the output voltage of the current integration circuit, will be described
The output voltage setting of the corresponding current integration circuit of area of second area is the second reference voltage.
In the S30, the voltage value of first reference voltage is more than the voltage value of second reference voltage；The base
The voltage value of quasi- voltage is less than the voltage value of first reference voltage, and more than the voltage value of second reference voltage.
For example, when the voltage value of the comparison voltage is more than the voltage value of the reference voltage, the first comparator
Output starts the control signal of overcurrent protection.
As shown in figure 3, according to GOA circuits overcurrent protection method for detecting of the present invention, a kind of GOA circuits, the GOA electricity are provided
Road includes level shifting circuit, and the level shifting circuit includes：Current integration circuit 303, the electric current I amplifiers for that will input
Afterwards, output comparison voltage Vo；First connecting pin of first comparator 301, the first comparator 301 connects the current integration
For the output end of circuit 303 to receive the comparison voltage Vo, the second connection end of the first comparator 301 accesses reference voltage
Vref；Wherein, the first comparator 301 is compared the voltage value of the comparison voltage Vo and the reference voltage V ref
After processing, whether output starts the control signal OCP of overcurrent protection.
The current integration circuit 303 includes the second comparator 302, resistance R and capacitance C, the input terminal of the resistance R
Current I signal is accessed, the output end of the resistance R connects the reverse input end of second comparator 302, the capacitance C's
First connecting pin connects the output end of the resistance R, and the second connection end of the capacitance C connects second comparator 302
Output end, the positive input ground connection of second comparator 302.
Beneficial effects of the present invention are：It is provided by the invention compared with the current foldback circuit of the GOA circuits of the prior art
The overcurrent protection method for detecting of GOA circuits and GOA circuits, adds detecting module in level shifting circuit, according to the electricity of input
It flows amplifier and exports comparison voltage, the comparison voltage of output and the reference voltage of setting are exported into control signal more afterwards, can be excluded
To being not required to the overcurrent protection of transient high-current to be protected, reduce overcurrent protection false triggering probability；To solve existing GOA circuits
In overcurrent protection detect mechanism, may will be in array substrate when detecting the GOA signal values of some time point or period
Data and Gate between couple formation transient high-current erroneous judgement be over-current phenomenon avoidance, further trigger overcurrent protection, may
Display pixel is caused the technical issues of under-voltage defect occur.
In conclusion although the present invention is disclosed above with preferred embodiment, above preferred embodiment is not to limit
The system present invention, those skilled in the art can make various changes and profit without departing from the spirit and scope of the present invention
Decorations, therefore protection scope of the present invention is subject to the range that claim defines.
Claims (10)
1. a kind of GOA circuits overcurrent protection method for detecting, for judging whether the electric current of input display panel meets overcurrent protection
Unlocking condition, the GOA circuits include level shifting circuit, which is characterized in that the level shifting circuit includes current integration
The voltage value of the first comparator of circuit and the connection current integration circuit, the current integration circuit output is electric current
To the integral of time；The method includes：
After the current integration circuit is to the electric current amplifier of input, ratio is inputted to the first input end of the first comparator by S10
Compared with voltage；
S20 obtains the first reference voltage and the second reference voltage；
S30, to the second input terminal input reference voltage of the first comparator, wherein the voltage value of the reference voltage is set
It is set between first reference voltage and second reference voltage；
S40, after the first comparator is compared processing to the voltage value of the comparison voltage and the reference voltage, output
Whether the control signal of overcurrent protection is started.
2. according to the method described in claim 1, it is characterized in that, in the S 10, the current integration circuit includes second
The input terminal of comparator, resistance and capacitance, the resistance accesses current signal, the output end connection described second of the resistance
The reverse input end of comparator, the first connecting pin of the capacitance connect the output end of the resistance, and the second of the capacitance connects
Connect the output end that end connects second comparator, the positive input ground connection of second comparator.
3. according to the method described in claim 2, it is characterized in that, the electric current of current integration circuit input and output
The comparison voltage between relationship be：
Wherein, I is the electric current, and Vo is the comparison voltage.
4. according to the method described in claim 2, it is characterized in that,
The first input end of the first comparator is inverse output terminal, and the second input terminal of the first comparator is positive defeated
Outlet；
The output end of second comparator connects the inverse output terminal of the first input end, the forward direction of the first comparator
Output end accesses reference voltage signal.
5. according to the method described in claim 1, it is characterized in that,
The S20 includes：
S201 obtains the oscillogram of the first electric current, and the oscillogram of first electric current is to need the abnormal circuit wave of overcurrent protection
Shape, the oscillogram include the Y-coordinate axle for representing current value and the X-coordinate axle for representing the time, the waveform of first electric current with
First area is formed between the Y-coordinate axle and the X-coordinate axle, the area of the first area is the first electric current clock synchronization
Between integral, first Current versus time integral be the current integration circuit output voltage, by firstth area
The output voltage setting of the corresponding current integration circuit of area in domain is the first reference voltage；
S202 obtains the oscillogram of the second electric current, and the oscillogram of second electric current is not need the abnormal circuit of overcurrent protection
Waveform, the oscillogram include the Y-coordinate axle for representing current value and the X-coordinate axle for representing the time, the waveform of second electric current
Second area is formed between the Y-coordinate axle and the X-coordinate axle, the area of the second area is second electric current pair
The integral of time, the integral of second Current versus time is the output voltage of the current integration circuit, by described second
The output voltage setting of the corresponding current integration circuit of area in region is the second reference voltage.
6. according to the method described in claim 5, it is characterized in that, in the S30, the voltage value of first reference voltage is big
In the voltage value of second reference voltage；The voltage value of the reference voltage is less than the voltage value of first reference voltage,
And more than the voltage value of second reference voltage.
7. according to the method described in claim 6, it is characterized in that, when the voltage value of the comparison voltage is more than benchmark electricity
When the voltage value of pressure, the first comparator output starts the control signal of overcurrent protection.
8. a kind of GOA circuits, the GOA circuits include level shifting circuit, which is characterized in that the level shifting circuit packet
It includes：
Current integration circuit, for after the electric current amplifier that will input, output comparison voltage；
First connecting pin of first comparator, the first comparator connects the output end of the current integration circuit to receive
Comparison voltage is stated, the second connection end of the first comparator accesses reference voltage；
Wherein, it is defeated after the first comparator is compared processing to the voltage value of the comparison voltage and the reference voltage
Go out whether to start the control signal of overcurrent protection.
9. GOA circuits according to claim 8, which is characterized in that the current integration circuit includes the second comparator, electricity
The input terminal of resistance and capacitance, the resistance accesses current signal, and the output end of the resistance connects second comparator
Reverse input end, the first connecting pin of the capacitance connect the output end of the resistance, the second connection end connection of the capacitance
The output end of second comparator, the positive input ground connection of second comparator.
10. GOA circuits according to claim 9, which is characterized in that the electric current of current integration circuit input with
Output the comparison voltage between relationship be：
Wherein, I is the electric current, and Vo is the comparison voltage.
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| CN201810100043.5A CN108303581B (en) | 2018-02-01 | 2018-02-01 | GOA circuit and GOA circuit overcurrent protection detection method |
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| CN201810100043.5A CN108303581B (en) | 2018-02-01 | 2018-02-01 | GOA circuit and GOA circuit overcurrent protection detection method |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109617008A (en) * | 2018-12-12 | 2019-04-12 | 惠科股份有限公司 | Overcurrent protection method, display panel and display device |
| CN110910844A (en) * | 2019-11-13 | 2020-03-24 | Tcl华星光电技术有限公司 | Level conversion chip and display device |
| WO2020103308A1 (en) * | 2018-11-22 | 2020-05-28 | 深圳市华星光电技术有限公司 | Overcurrent protection control circuit for use in level shift circuit |
| CN111312194A (en) * | 2020-04-03 | 2020-06-19 | 深圳市华星光电半导体显示技术有限公司 | Protection system for GOA circuit and liquid crystal display panel |
| CN114512079A (en) * | 2020-11-16 | 2022-05-17 | 群创光电股份有限公司 | Electronic device |
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| CN114512079A (en) * | 2020-11-16 | 2022-05-17 | 群创光电股份有限公司 | Electronic device |
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