CN107749285A - One kind electric leakage flow control circuit and control method - Google Patents
One kind electric leakage flow control circuit and control method Download PDFInfo
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- CN107749285A CN107749285A CN201711120938.7A CN201711120938A CN107749285A CN 107749285 A CN107749285 A CN 107749285A CN 201711120938 A CN201711120938 A CN 201711120938A CN 107749285 A CN107749285 A CN 107749285A
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
- G09G3/3611—Control of matrices with row and column drivers
- G09G3/3648—Control of matrices with row and column drivers using an active matrix
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- Crystallography & Structural Chemistry (AREA)
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Abstract
The invention discloses one kind electric leakage flow control circuit and control method, the electric leakage flow control circuit includes：Leakage current detecting module, for detecting the leakage current signal of thin film transistor (TFT)；Current Voltage modular converter, for the leakage current signal to be converted into voltage signal；Voltage comparison module, for compared with predeterminated voltage signal, to filter out the voltage signal in predetermined voltage range, and the voltage signal to be generated into comparative level signal；Logical operation module, for carrying out logical operation to the comparative level signal, to generate logic level signal；Time schedule controller, under the control of the logic level signal, being adjusted to the output voltage of the time schedule controller, to cause the leakage current to meet preset value.
Description
Technical field
The present invention relates to the fields such as thin film transistor, leakage current protection, are specially a kind of electric leakage flow control circuit
And control method.
Background technology
In LCDs in use, the reason for causing thin film transistor (TFT) unstable typically has two kinds：First, half in raceway groove
The defects of conductor material internal,；Another is in gate insulator or the charge trap of insulating barrier and channel layer interface.Liquid
Crystal display screen, because the influence of high temperature and illumination can cause leakage current to increase, and then causes in longtime running to thin film transistor (TFT)
Destroy.
The current leakage of LCDs is always a problem, after the panel and long-term use for firm output
Panel, its leakage current differ greatly.In this case, for product initial stage and the design value difference of the VGL voltages in later stage
It is different if designed with initial production, the later stage also to be caused to have larger leakage current very greatly, cause the charge number in panel
According to missing, cause Display panel bad.
The content of the invention
It is an object of the present invention to provide one kind electric leakage flow control circuit and control method, with solve in the prior art because
TFT thin film transistor monitor fluctuation of service problem caused by current leakage.
In order to solve the above technical problems, the present invention provides a kind of electric leakage flow control circuit, including：
Leakage current detecting module, for detecting the leakage current signal of thin film transistor (TFT)；
Current Voltage modular converter, for the leakage current signal to be converted into voltage signal；
Voltage comparison module, for the voltage signal compared with predeterminated voltage signal, to be preset with filtering out
The voltage signal in voltage range, and generate comparative level signal；
Logical operation module, for carrying out logical operation to the comparative level signal, to generate logic level signal；
Time schedule controller, under the control of the logic level signal, to the output voltage of the time schedule controller
It is adjusted, to cause the leakage current to meet preset value.
In the electric leakage flow control circuit of the present invention, the voltage comparison module includes：
Operational amplifier, for carrying out operation amplifier processing to the voltage signal；
Voltage comparator, for the voltage signal after operational amplifier processing to be entered with predeterminated voltage signal
Row contrast, to obtain comparative level signal.
In the electric leakage flow control circuit of the present invention, the predeterminated voltage signal includes the first parameter voltages and the second parameter
Voltage, the voltage comparator are used to judge whether the magnitude of voltage of the voltage signal to join in first parameter voltages and second
Between number voltage, wherein, the voltage signal is described with obtaining the first comparative level signal after first parameter voltages
Voltage signal after second parameter voltages with obtaining the second comparative level signal.
In the electric leakage flow control circuit of the present invention, the logical operation module includes：
With gate circuit, its input inputs the first comparative level signal and second electrical level signal, its output end respectively
Export the first logic level signal；
OR-NOT circuit, its input input the first comparative level signal and second electrical level signal respectively, and it is exported
The second logic level signal of end output；
OR circuit, its output end input first logic level signal, the second logic level signal respectively, and it is exported
The 3rd logic level signal of end output；The time schedule controller is used under the control of the 3rd logic level signal, to institute
The output voltage for stating time schedule controller is adjusted, to cause the leakage current to meet preset value.
In the electric leakage flow control circuit of the present invention, when the first comparative level signal and second electrical level signal are height
Level or when being low level, the 3rd logic level signal is high level, and the time schedule controller is patrolled according to the described 3rd
It is high level to collect level signal, the output voltage of the time schedule controller is adjusted, make it that it is pre- that the leakage current meets
If value.
In order to solve the above technical problems, the present invention also provides a kind of electric leakage method of flow control, comprise the following steps：Obtain thin
The leakage current signal of film transistor；
The leakage current signal is converted into voltage signal；
By the voltage signal compared with predeterminated voltage signal, to filter out the electricity in predetermined voltage range
Signal is pressed, and generates comparative level signal；
Logical operation is carried out to the comparative level signal, to generate logic level signal；
Under the control of the logic level signal, the output voltage of the time schedule controller is adjusted, to cause
The leakage current meets preset value.
The present invention electric leakage method of flow control in, it is described by the voltage signal compared with predeterminated voltage signal,
To filter out the voltage signal in predetermined voltage range, and the step of generate comparative level signal, including
Operation amplifier processing is carried out to the voltage signal；
The voltage signal after operational amplifier processing is contrasted with predeterminated voltage signal, compared
Level signal.
In the electric leakage method of flow control of the present invention, the predeterminated voltage signal includes the first parameter voltages and the second parameter
Voltage, the voltage comparator are used to judge whether the magnitude of voltage of the voltage signal to join in first parameter voltages and second
Between number voltage, wherein, the voltage signal is described with obtaining the first comparative level signal after first parameter voltages
Voltage signal after second parameter voltages with obtaining the second comparative level signal.
It is described that logical operation is carried out to the comparative level signal in the electric leakage method of flow control of the present invention, with generation
The step of logic level signal, including：
To the first comparative level signal and second electrical level signal carries out and computing, obtains the first logic level signal,
And NOR-operation is carried out to the first comparative level signal and second electrical level signal, obtain the second logic level signal；
To first logic level signal, the second logic level signal carries out or computing, obtains the 3rd logic level letter
Number；
Wherein, when the first comparative level signal and second electrical level signal are high level or are low level, institute
It is high level to state the 3rd logic level signal.
It is described under the control of the logic level signal in the electric leakage method of flow control of the present invention, to the sequential
The output voltage of controller is adjusted, the step of to cause the leakage current to meet preset value, including：
When the 3rd logic level signal is high level, the output voltage of the time schedule controller is adjusted, with
So that the leakage current meets preset value.
It is an advantage of the invention that：The electric leakage flow control circuit and its control method of the present invention, can detect film in real time
The leakage current of transistor, and the size of thin film transistor (TFT) VGL voltages can be regulated and controled according to the result of detecting, to ensure leakage current
Size in specification limit, be effectively guaranteed display screen during display, data charge will not be let go, solve because
Display panel caused by leakage current is excessive is bad.
Brief description of the drawings
The present invention is further explained with reference to the accompanying drawings and examples；
Fig. 1 is the schematic diagram of electric leakage flow control circuit described in the embodiment of the present invention；
Fig. 2 is the partial circuit diagram of electric leakage flow control circuit described in the embodiment of the present invention；
Fig. 3 is the flow chart of electric leakage method of flow control described in the embodiment of the present invention；
Fig. 4 is step S3 in Fig. 3) particular flow sheet；
Fig. 5 is step S4 in Fig. 3) particular flow sheet.
Part numbers are as follows in figure：
1 leakage current detecting module；2 Current Voltage modular converters；
3 voltage comparison modules；4 logical operation modules；
5 time schedule controllers；21 operational amplifiers；
22 voltage comparators；41 and gate circuit；
42 OR-NOT circuits；43 OR circuits.
Embodiment
The explanation of following examples is with reference to additional schema, to illustrate the particular implementation that the present invention can be used to implementation
Example.The direction term that the present invention is previously mentioned, such as " on ", " under ", "front", "rear", "left", "right", " top ", " bottom " etc., only it is
With reference to the direction of annexed drawings.Therefore, the direction term used is to illustrate and understand the present invention, and is not used to limit this hair
It is bright.
Embodiment, as shown in figure 1, a kind of electric leakage flow control circuit, including the conversion of leakage current detecting module 1, Current Voltage
Module 2, voltage comparison module 3, logical operation module 4, time schedule controller 5.
Wherein, leakage current detecting module 1 is used for the leakage current signal for detecting thin film transistor (TFT).
Voltage transformation module 2 is used to leakage current signal being converted to voltage signal.
Voltage comparison module 3 is used for by voltage signal compared with predeterminated voltage signal, to filter out in predeterminated voltage
In the range of voltage signal, and generate comparative level signal.
Specifically, the voltage comparison module 3 includes operational amplifier 31, voltage comparator 32.Wherein, operational amplifier 31
For carrying out operation amplifier processing to voltage signal；Voltage comparator 32 is used to believe the voltage after operational amplifier 31 is handled
Number contrasted with predeterminated voltage signal, to obtain comparative level signal.As shown in Fig. 2 voltage comparator 32 receives default electricity
Signal is pressed, the predeterminated voltage signal includes the first parameter voltages Vref1 and the second parameter voltages Vref2.Voltage comparator 32 is used
In the magnitude of voltage for judging voltage signal whether between the first parameter voltages and the second parameter voltages, if not existing, the electricity is judged
Signal or the electric leakage throat floater are pressed, now, the voltage comparator 32 can generate an alarm signal.If in the first parameter electricity
Pressure after voltage signal with obtaining the first comparative level signal, such as the level V4 in Fig. 2；Second parameter voltages and the voltage
The second comparative level signal is obtained after signal, such as the level V3 in Fig. 2.
Logical operation module 4 is used to carry out logical operation to comparing level signal, generates logic level signal.
Specifically, the logical operation module 4 include with gate circuit 41, OR-NOT circuit 42, OR circuit 43, with gate circuit
41 input inputs the first comparative level signal and second electrical level signal respectively, and its output end exports the first logic level letter
Number, such as the V5 in Fig. 2；The input of OR-NOT circuit 42 inputs the first comparative level signal and second electrical level signal respectively, its
Output end exports the second logic level signal, such as the V6 in Fig. 2；The output end of OR circuit 43 inputs the first logic level respectively
Signal, the second logic level signal, its output end exports the 3rd logic level signal, such as the V7 in Fig. 2.
Time schedule controller 5 is used under the control of logic level signal, and the output voltage of time schedule controller 5 is carried out
Adjustment, to cause leakage current to meet preset value.Further, time schedule controller 5 is used for the control in the 3rd logic level signal
Under, the output voltage of time schedule controller 5 is adjusted, to cause leakage current to meet preset value.When the first comparative level signal
When being high level or be low level with second electrical level signal, the 3rd logic level signal is high level, time schedule controller 5
It is high level according to the 3rd logic level signal, the output voltage of time schedule controller 5 is adjusted, make it that it is pre- that leakage current meets
If value.When the first comparative level signal is high level and second electrical level signal is low level, or, when the first comparative level signal
When for low level and second electrical level signal being high level, the 3rd logic level signal is low level.Now, time schedule controller
5 under the control of the 3rd logic level signal, it is not necessary to which the output voltage of the time schedule controller is adjusted.
The electric leakage flow control circuit of the present invention, the leakage current of thin film transistor (TFT) can be detected in real time, and being capable of basis
The size of the result regulation and control thin film transistor (TFT) VGL voltages of detecting, it is effective to protect to ensure the size of leakage current in specification limit
Display screen has been demonstrate,proved during display, data charge will not be let go, solve due to leakage current it is excessive caused by Display panel not
It is good.
A kind of electric leakage method of flow control realized according to above-mentioned electric leakage flow control circuit, as shown in figure 3, specifically include with
Lower step：
Step S1) obtain thin film transistor (TFT) leakage current signal.
Step S2) the leakage current signal is converted into voltage signal.
Step S3) by the voltage signal compared with predeterminated voltage signal, to filter out in predetermined voltage range
The voltage signal, and generate comparative level signal.
Step S4) logical operation is carried out to the comparative level signal, to generate logic level signal.
Step S5) under the control of the logic level signal, the output voltage of the time schedule controller is adjusted,
To cause the leakage current to meet preset value.
Wherein, it is described by the voltage signal compared with predeterminated voltage signal, to filter out in predetermined voltage range
The interior voltage signal, and the step of generate comparative level signal, including
Step S31) operation amplifier processing is carried out to the voltage signal；
Step S32) voltage signal after operational amplifier processing is contrasted with predeterminated voltage signal,
Obtain comparative level signal.
Specifically, in step S32) in, predeterminated voltage signal includes the first parameter voltages and the second parameter voltages, voltage ratio
It is used to judge the magnitude of voltage of the voltage signal whether between first parameter voltages and the second parameter voltages compared with device 22,
If not existing, the voltage signal or the electric leakage throat floater are judged, now, the voltage comparator 22 can generate an alarm signal；
If the first comparative level signal, the second parameter voltages and electricity are being obtained after the first parameter voltages and the voltage signal
The second comparative level signal is obtained after pressure signal.
Wherein, it is described that logical operation is carried out to the comparative level signal, the step of to generate logic level signal, bag
Include：
Step S41) to the first comparative level signal and the progress of second electrical level signal and computing, obtain the first logic electricity
Ordinary mail number, and NOR-operation is carried out to the first comparative level signal and second electrical level signal, obtain the second logic level
Signal；
Step S42) to first logic level signal, the progress of the second logic level signal or computing, obtain the 3rd and patrol
Collect level signal；
Wherein, when the first comparative level signal and second electrical level signal are high level or are low level, institute
It is high level to state the 3rd logic level signal.
Wherein, it is described under the control of the logic level signal, the output voltage of the time schedule controller is adjusted
It is whole, the step of to cause the leakage current to meet preset value, including：
When the 3rd logic level signal is high level, the output voltage of the time schedule controller is adjusted, with
So that the leakage current meets preset value.
The electric leakage flow control circuit and its control method of the present invention, the leakage current of thin film transistor (TFT) can be detected in real time,
And the size of thin film transistor (TFT) VGL voltages can be regulated and controled according to the result of detecting, to ensure the size of leakage current in specification model
In enclosing, display screen is effectively guaranteed during display, and data charge will not be let go, and solve that due to leakage current is excessive to be caused
Display panel it is bad.
These are only presently preferred embodiments of the present invention, be not intended to limit the invention, it is all the present invention spirit and
All any modification, equivalent and improvement made within principle etc., should be included in the scope of the protection.
Claims (10)
1. one kind electric leakage flow control circuit, it is characterised in that including：
Leakage current detecting module, for detecting the leakage current signal of thin film transistor (TFT)；
Current Voltage modular converter, for the leakage current signal to be converted into voltage signal；
Voltage comparison module, for by the voltage signal compared with predeterminated voltage signal, to filter out in predeterminated voltage
In the range of the voltage signal, and generate comparative level signal；
Logical operation module, for carrying out logical operation to the comparative level signal, to generate logic level signal；
Time schedule controller, under the control of the logic level signal, being carried out to the output voltage of the time schedule controller
Adjustment, to cause the leakage current to meet preset value.
2. electric leakage flow control circuit according to claim 1, it is characterised in that the voltage comparison module includes：
Operational amplifier, for carrying out operation amplifier processing to the voltage signal；
Voltage comparator, for the voltage signal and the predeterminated voltage signal after operational amplifier processing to be carried out pair
Than to obtain comparative level signal.
3. electric leakage flow control circuit according to claim 2, it is characterised in that the predeterminated voltage signal includes the first ginseng
Number voltage and the second parameter voltages, whether the magnitude of voltage that the voltage comparator is used to judge the voltage signal is described first
Between parameter voltages and the second parameter voltages, wherein, the voltage signal after first parameter voltages with obtaining first
Comparative level signal, the voltage signal after second parameter voltages with obtaining the second comparative level signal.
4. electric leakage flow control circuit according to claim 3, it is characterised in that the logical operation module includes：
With gate circuit, its input inputs the first comparative level signal and second electrical level signal, the output of its output end respectively
First logic level signal；
OR-NOT circuit, its input input the first comparative level signal and second electrical level signal respectively, and its output end is defeated
Go out the second logic level signal；
OR circuit, its output end input first logic level signal, the second logic level signal respectively, and its output end is defeated
Go out the 3rd logic level signal；The time schedule controller be used under the control of the 3rd logic level signal, to it is described when
The output voltage of sequence controller is adjusted, to cause the leakage current to meet preset value.
5. electric leakage flow control circuit according to claim 3, it is characterised in that when the first comparative level signal and
When two level signals are high level or are low level, the 3rd logic level signal is high level, the SECO
Device is high level according to the 3rd logic level signal, and the output voltage of the time schedule controller is adjusted, to cause
The leakage current meets preset value.
6. one kind electric leakage method of flow control, it is characterised in that comprise the following steps：
Obtain the leakage current signal of thin film transistor (TFT)；
The leakage current signal is converted into voltage signal；
By the voltage signal compared with predeterminated voltage signal, to filter out the letter of the voltage in predetermined voltage range
Number, and generate comparative level signal；
Logical operation is carried out to the comparative level signal, to generate logic level signal；
Under the control of the logic level signal, the output voltage of the time schedule controller is adjusted, it is described to cause
Leakage current meets preset value.
7. electric leakage method of flow control according to claim 3, it is characterised in that described by the voltage signal and default electricity
Pressure signal is compared, and to filter out the voltage signal in predetermined voltage range, and generates the step of comparative level signal
Suddenly, including：
Operation amplifier processing is carried out to the voltage signal；
The voltage signal after operational amplifier processing is contrasted with predeterminated voltage signal, obtains comparative level
Signal.
8. electric leakage method of flow control according to claim 7, it is characterised in that the predeterminated voltage signal includes the first ginseng
Number voltage and the second parameter voltages, whether the magnitude of voltage that the voltage comparator is used to judge the voltage signal is described first
Between parameter voltages and the second parameter voltages, wherein, the voltage signal after first parameter voltages with obtaining first
Comparative level signal, the voltage signal after second parameter voltages with obtaining the second comparative level signal.
9. electric leakage method of flow control according to claim 8, it is characterised in that described to be carried out to the comparative level signal
Logical operation, the step of to generate logic level signal, including：
To the first comparative level signal and second electrical level signal carries out and computing, obtains the first logic level signal, and
NOR-operation is carried out to the first comparative level signal and second electrical level signal, obtains the second logic level signal；
To first logic level signal, the second logic level signal carries out or computing, obtains the 3rd logic level signal；
Wherein, when the first comparative level signal and second electrical level signal are high level or are low level, described
Three logic level signals are high level.
10. electric leakage method of flow control according to claim 9, it is characterised in that described in the logic level signal
Under control, the output voltage of the time schedule controller is adjusted, the step of to cause the leakage current to meet preset value, bag
Include：
When the 3rd logic level signal is high level, the output voltage of the time schedule controller is adjusted, to cause
The leakage current meets preset value.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201711120938.7A CN107749285A (en) | 2017-11-14 | 2017-11-14 | One kind electric leakage flow control circuit and control method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711120938.7A CN107749285A (en) | 2017-11-14 | 2017-11-14 | One kind electric leakage flow control circuit and control method |
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Family
ID=61250662
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110910836A (en) * | 2019-12-25 | 2020-03-24 | 厦门天马微电子有限公司 | Control method of organic light emitting display panel, electronic device and controller |
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Application publication date: 20180302 |
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