CN108303581B - GOA circuit and GOA circuit overcurrent protection detection method - Google Patents
GOA circuit and GOA circuit overcurrent protection detection method Download PDFInfo
- Publication number
- CN108303581B CN108303581B CN201810100043.5A CN201810100043A CN108303581B CN 108303581 B CN108303581 B CN 108303581B CN 201810100043 A CN201810100043 A CN 201810100043A CN 108303581 B CN108303581 B CN 108303581B
- Authority
- CN
- China
- Prior art keywords
- current
- voltage
- circuit
- comparator
- reference voltage
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- 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
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Control Of Indicators Other Than Cathode Ray Tubes (AREA)
- Emergency Protection Circuit Devices (AREA)
- Liquid Crystal Display Device Control (AREA)
Abstract
The invention provides an overcurrent protection detection method of a GOA circuit, which is used for judging whether current input into a display panel meets an overcurrent protection starting condition or not, wherein the GOA circuit comprises a level conversion circuit, the level conversion circuit comprises a current integrating circuit and a first comparator connected with the current integrating circuit; after the current integrating circuit operates and amplifies the input current, comparison voltage is input to a first input end of a first comparator; inputting a reference voltage to a second input terminal of the first comparator; the first comparator compares the comparison voltage with the voltage value of the reference voltage and outputs a control signal for judging whether to start the overcurrent protection; the beneficial effects are that: according to the overcurrent protection detection method of the GOA circuit, the detection module is additionally arranged in the level conversion circuit, the comparison voltage is output according to the input current operational amplifier, the output comparison voltage is compared with the set reference voltage, and then the control signal is output, so that overcurrent protection on instantaneous large current which does not need to be protected can be eliminated.
Description
Technical Field
The invention relates to the technical field of display driving, in particular to a GOA circuit and an overcurrent protection detection method of the GOA circuit.
Background
At present, the driving architecture of a TFT-LCD (thin film transistor-liquid crystal display panel) increasingly adopts a design of Gate On Array (GOA), and the Gate control circuit function is implemented On the liquid crystal panel through a TFT circuit, thereby effectively reducing the design cost. However, the GOA technology is accompanied by safety problems, and because the voltage value of the GOA signal is very large, when there is a short circuit problem in the array substrate, the current of the GOA control signal is increased, which causes the temperature of the short circuit point on the panel to be too high, and even risks of screen melting, so a detection mechanism is needed to protect the abnormal condition.
Currently, each Level shift IC (Level shift circuit) manufacturer generally adopts an instantaneous value detection technology, and determines whether a trigger condition has been reached by detecting a GOA signal current value at a certain time point or time period, so as to perform protection. However, this technique has a significant technical drawback, because of the Couple effect of Data (Data line) and Gate (Gate line) in the array substrate, the GOA signal may have some transient large current phenomena, and further trigger the OCP (over current Protection) Protection of the IC; actually, such instantaneous large current does not affect the normal operation of the array substrate, and belongs to false triggering.
In summary, in the current over-current protection detection mechanism in the GOA circuit, when detecting a GOA signal value at a certain time point or time period, an instantaneous large current formed by coupling between data and Gate in the array substrate may be erroneously determined as an over-current phenomenon, and further over-current protection is triggered, which may cause an under-voltage defect to occur in the display pixel.
Disclosure of Invention
The invention provides a GOA circuit overcurrent protection detection method, which is characterized in that a detection module is additionally arranged in a level conversion circuit, a comparison voltage is output according to an input current operational amplifier, the output comparison voltage is compared with a set reference voltage, and then a control signal is output, so that overcurrent protection of instantaneous large current which does not need to be protected is eliminated, and the probability of overcurrent protection false triggering is reduced.
In order to solve the above problems, the technical scheme provided by the invention is as follows:
the invention provides an overcurrent protection detection method of a GOA circuit, which is used for judging whether current input into a display panel meets an overcurrent protection starting condition or not, wherein the GOA circuit comprises a level conversion circuit, the level conversion circuit comprises a current integrating circuit and a first comparator connected with the current integrating circuit, and a voltage value output by the current integrating circuit is the integral of the current to time; the method comprises the following steps:
and S10, after the current integrating circuit operates and amplifies the input current, comparing voltage is input to a first input end of the first comparator.
And S20, acquiring a first reference voltage and a second reference voltage.
S30, inputting a reference voltage to the second input terminal of the first comparator, wherein the voltage value of the reference voltage is set to be between the first reference voltage and the second reference voltage.
And S40, the first comparator compares the comparison voltage with the voltage value of the reference voltage and outputs a control signal for judging whether to start over-current protection.
According to a preferred embodiment of the present invention, in S10, the current integrating circuit includes a second comparator, a resistor, and a capacitor, an input end of the resistor is connected to a current signal, an output end of the resistor is connected to an inverting input end of the second comparator, a first connection end of the capacitor is connected to an output end of the resistor, a second connection end of the capacitor is connected to an output end of the second comparator, and a forward input end of the second comparator is grounded.
According to a preferred embodiment of the present invention, the relationship between the current input to the current integration circuit and the comparison voltage output is:
According to a preferred embodiment of the present invention, the first input terminal of the first comparator is an inverted output terminal, and the second input terminal of the first comparator is a forward output terminal; the output end of the second comparator is connected with the reverse output end of the first input end, and the forward output end of the first comparator is connected with a reference voltage signal.
According to a preferred embodiment of the present invention, the S20 includes:
s201, obtaining a waveform diagram of a first current, wherein the waveform diagram of the first current is an abnormal circuit waveform needing overcurrent protection, the waveform diagram comprises a Y coordinate axis representing a current value and an X coordinate axis representing time, a first region is formed between the waveform of the first current and the Y coordinate axis and between the waveform of the first current and the X coordinate axis, the area of the first region is the integral of the first current over time, the integral of the first current over time is the output voltage of the current integrating circuit, and the output voltage of the current integrating circuit corresponding to the area of the first region is set as a first reference voltage.
S202, obtaining a waveform diagram of a second current, wherein the waveform diagram of the second current is an abnormal circuit waveform without overcurrent protection, the waveform diagram comprises a Y coordinate axis representing a current value and an X coordinate axis representing time, a second region is formed between the waveform of the second current and the Y coordinate axis and the X coordinate axis, the area of the second region is the integral of the second current with respect to time, the integral of the second current with respect to time is the output voltage of the current integrating circuit, and the output voltage of the current integrating circuit corresponding to the area of the second region is set as a second reference voltage.
According to a preferred embodiment of the present invention, in S30, the voltage value of the first reference voltage is greater than the voltage value of the second reference voltage; the voltage value of the reference voltage is smaller than that of the first reference voltage and larger than that of the second reference voltage.
According to a preferred embodiment of the present invention, when the voltage value of the comparison voltage is greater than the voltage value of the reference voltage, the first comparator outputs a control signal for activating the overcurrent protection.
According to the above object of the present invention, there is provided a GOA circuit including a level shifter circuit, the level shifter circuit comprising:
the current integrating circuit is used for outputting comparison voltage after the input current is amplified;
a first connection end of the first comparator is connected with the output end of the current integrating circuit to receive the comparison voltage, and a second connection end of the first comparator is connected with a reference voltage;
and after the comparison voltage and the voltage value of the reference voltage are compared by the first comparator, a control signal for judging whether to start over-current protection is output.
According to a preferred embodiment of the present invention, the current integration circuit includes a second comparator, a resistor, and a capacitor, wherein an input terminal of the resistor is connected to a current signal, an output terminal of the resistor is connected to an inverting input terminal of the second comparator, a first connection terminal of the capacitor is connected to an output terminal of the resistor, a second connection terminal of the capacitor is connected to an output terminal of the second comparator, and a forward input terminal of the second comparator is grounded.
According to a preferred embodiment of the present invention, the relationship between the current input to the current integration circuit and the comparison voltage output is:
The invention has the beneficial effects that: compared with the overcurrent protection circuit of the GOA circuit in the prior art, the GOA circuit and the overcurrent protection detection method of the GOA circuit provided by the invention have the advantages that the detection module is additionally arranged in the level conversion circuit, the comparison voltage is output according to the input current operational amplifier, the output comparison voltage is compared with the set reference voltage, and then the control signal is output, so that the overcurrent protection of instantaneous large current which does not need to be protected can be eliminated, and the false triggering probability of the overcurrent protection is reduced; the over-current protection detection mechanism in the existing GOA circuit solves the technical problem that when a GOA signal value at a certain time point or time period is detected, instantaneous large current formed by coupling between data and Gate in an array substrate can be misjudged as an over-current phenomenon, over-current protection is further triggered, and under-voltage defects of display pixels can be caused.
Drawings
In order to illustrate the embodiments or the technical solutions in the prior art more clearly, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the invention, and it is obvious for a person skilled in the art that other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a flow chart of a method for detecting the overcurrent protection of the GOA circuit according to the present invention.
FIG. 2a is a schematic diagram of a current waveform of a normal GOA signal without protection;
FIG. 2b is a schematic diagram of a current waveform of a GOA signal requiring protection;
FIG. 2c is a schematic diagram showing the current waveform of an abnormal GOA signal without protection;
fig. 3 is a schematic diagram of a GOA circuit structure provided in the present invention.
Detailed Description
The following description of the various embodiments refers to the accompanying drawings that illustrate specific embodiments in which the invention may be practiced. The directional terms mentioned in the present invention, such as [ upper ], [ lower ], [ front ], [ rear ], [ left ], [ right ], [ inner ], [ outer ], [ side ], are only referring to the directions of the attached drawings. Accordingly, the directional terms used are used for explanation and understanding of the present invention, and are not used for limiting the present invention. In the drawings, elements having similar structures are denoted by the same reference numerals.
Aiming at an overcurrent protection detection mechanism in the existing GOA circuit, when a GOA signal value at a certain time point or time period is detected, instantaneous large current formed by coupling between data and Gate in an array substrate can be judged to be an overcurrent phenomenon by mistake, overcurrent protection is further triggered, and the technical problem that undervoltage defects of display pixels can be caused can be solved.
As shown in fig. 1, the present invention provides an overcurrent protection detection method for a GOA circuit, which is used for determining whether a current input to a display panel meets an overcurrent protection starting condition, where the GOA circuit includes a level shifter circuit, the level shifter circuit includes a current integrator circuit and a first comparator connected to the current integrator circuit, and a voltage value output by the current integrator circuit is an integral of the current with respect to time; the overcurrent protection detection method comprises the following steps:
and S10, after the current integrating circuit operates and amplifies the input current, comparing voltage is input to a first input end of the first comparator.
And S20, acquiring a first reference voltage and a second reference voltage.
S30, inputting a reference voltage to the second input terminal of the first comparator, wherein the voltage value of the reference voltage is set to be between the first reference voltage and the second reference voltage.
And S40, the first comparator compares the comparison voltage with the voltage value of the reference voltage and outputs a control signal for judging whether to start over-current protection.
In S10, the current integrating circuit includes a second comparator, a resistor, and a capacitor, an input end of the resistor is connected to a current signal, an output end of the resistor is connected to a reverse input end of the second comparator, a first connection end of the capacitor is connected to an output end of the resistor, a second connection end of the capacitor is connected to an output end of the second comparator, and a forward input end of the second comparator is grounded.
A first input end of the first comparator is a reverse output end, and a second input end of the first comparator is a forward output end; the output end of the second comparator is connected with the reverse output end of the first input end, and the forward output end of the first comparator is connected with a reference voltage signal.
The relation between the current input by the current integration circuit and the comparison voltage output by the current integration circuit is as follows:
wherein I is the current and Vo is the comparison voltage; the integral formula can calculate the comparison voltage according to the input current.
In the prior art, overcurrent protection is started when overcurrent protection detects a large current, however, the large current of part of abnormal circuits is an instantaneous current, which does not affect the circuits of the display panel, and when the large current in the abnormal circuits lasts for a long time, the circuits of the display panel are damaged.
FIG. 2a is a schematic diagram showing a current waveform of a normal GOA signal; the graph comprises a Y coordinate axis representing the magnitude of the current value, an X coordinate axis representing the duration of the current, and a waveform line of the current value changing along with the time, wherein a shaded area is formed between the waveform line and the X coordinate axis and between the waveform line and the Y coordinate axis, and the shaded area is the area of the current to the coordinate axis and the integral of the current to the time.
In the figure, the GOA current is initially large and then decreases at a fast rate, the shaded area is relatively small, and no over-current protection needs to be activated.
As shown in fig. 2b, it is a schematic diagram of the current waveform of the GOA signal requiring overcurrent protection; the graph comprises a Y coordinate axis representing the magnitude of the current value, an X coordinate axis representing the duration of the current, and a waveform line of the current value changing along with the time, wherein a shaded area is formed between the waveform line and the X coordinate axis and between the waveform line and the Y coordinate axis, and the shaded area is the area of the current to the coordinate axis and the integral of the current to the time.
In the figure, the duration of the GOA large current is long and the shaded area is relatively large.
As shown in fig. 2c, it is a schematic diagram of current waveforms of abnormal GOA signals without overcurrent protection; the graph comprises a Y coordinate axis representing the magnitude of the current value, an X coordinate axis representing the duration of the current, and a waveform line of the current value changing along with the time, wherein a shaded area is formed between the waveform line and the X coordinate axis and between the waveform line and the Y coordinate axis, and the shaded area is the area of the current to the coordinate axis and the integral of the current to the time.
In the figure, the instantaneous GOA large current is shown, the duration of the large current is very short, the shaded area is larger than that of fig. 1 and is close to that of fig. 1, and the shaded area is smaller than that of fig. 2, so that overcurrent protection is not needed.
Specifically, the S20 includes:
s201, obtaining a waveform diagram of a first current, wherein the waveform diagram of the first current is an abnormal circuit waveform needing overcurrent protection, the waveform diagram comprises a Y coordinate axis representing a current value and an X coordinate axis representing time, a first region is formed between the waveform of the first current and the Y coordinate axis and between the waveform of the first current and the X coordinate axis, the area of the first region is the integral of the first current over time, the integral of the first current over time is the output voltage of the current integrating circuit, and the output voltage of the current integrating circuit corresponding to the area of the first region is set as a first reference voltage.
S202, obtaining a waveform diagram of a second current, wherein the waveform diagram of the second current is an abnormal circuit waveform without overcurrent protection, the waveform diagram comprises a Y coordinate axis representing a current value and an X coordinate axis representing time, a second region is formed between the waveform of the second current and the Y coordinate axis and the X coordinate axis, the area of the second region is the integral of the second current with respect to time, the integral of the second current with respect to time is the output voltage of the current integrating circuit, and the output voltage of the current integrating circuit corresponding to the area of the second region is set as a second reference voltage.
In S30, the voltage value of the first reference voltage is greater than the voltage value of the second reference voltage; the voltage value of the reference voltage is smaller than that of the first reference voltage and larger than that of the second reference voltage.
For example, when the voltage value of the comparison voltage is greater than the voltage value of the reference voltage, the first comparator outputs a control signal that activates overcurrent protection.
As shown in fig. 3, according to the present invention, a method for detecting an overcurrent protection of a GOA circuit is provided, where the GOA circuit includes a level shifter circuit, and the level shifter circuit includes: the current integrating circuit 303 is configured to output the comparison voltage Vo after amplifying the input current I; a first comparator 301, a first connection terminal of the first comparator 301 is connected to the output terminal of the current integrating circuit 303 to receive the comparison voltage Vo, and a second connection terminal of the first comparator 301 is connected to a reference voltage Vref; after the comparison voltage Vo and the voltage value of the reference voltage Vref are compared by the first comparator 301, a control signal OCP indicating whether to start the overcurrent protection is output.
The current integrating circuit 303 includes a second comparator 302, a resistor R, and a capacitor C, an input end of the resistor R is connected to a current I signal, an output end of the resistor R is connected to a reverse input end of the second comparator 302, a first connection end of the capacitor C is connected to an output end of the resistor R, a second connection end of the capacitor C is connected to an output end of the second comparator 302, and a forward input end of the second comparator 302 is grounded.
The invention has the beneficial effects that: compared with the overcurrent protection circuit of the GOA circuit in the prior art, the GOA circuit and the overcurrent protection detection method of the GOA circuit provided by the invention have the advantages that the detection module is additionally arranged in the level conversion circuit, the comparison voltage is output according to the input current operational amplifier, the output comparison voltage is compared with the set reference voltage, and then the control signal is output, so that the overcurrent protection of instantaneous large current which does not need to be protected can be eliminated, and the false triggering probability of the overcurrent protection is reduced; the over-current protection detection mechanism in the existing GOA circuit solves the technical problem that when a GOA signal value at a certain time point or time period is detected, instantaneous large current formed by coupling between data and Gate in an array substrate can be misjudged as an over-current phenomenon, over-current protection is further triggered, and under-voltage defects of display pixels can be caused.
In summary, although the present invention has been described with reference to the preferred embodiments, the above-described preferred embodiments are not intended to limit the present invention, and those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention, therefore, the scope of the present invention shall be determined by the appended claims.
Claims (10)
1. A GOA circuit over-current protection detection method is used for judging whether current input into a display panel meets an over-current protection starting condition or not, wherein the GOA circuit comprises a level conversion circuit, and the GOA circuit is characterized in that the level conversion circuit comprises a current integrating circuit and a first comparator connected with the current integrating circuit, and a voltage value output by the current integrating circuit is the integral of the current with respect to time; the method comprises the following steps:
s10, after the current integrating circuit operates and amplifies the input current, a comparison voltage is input to the first input terminal of the first comparator;
s20, acquiring a first reference voltage and a second reference voltage;
wherein the S20 includes:
s201, acquiring a waveform diagram of a first current, wherein the waveform diagram of the first current is an abnormal circuit waveform needing overcurrent protection, acquiring an output voltage of the first current, and setting the output voltage as a first reference voltage;
s202, acquiring a waveform diagram of a second current, wherein the waveform diagram of the second current is an abnormal circuit waveform without overcurrent protection, acquiring an output voltage of the second current, and setting the output voltage as a second reference voltage;
s30, inputting a reference voltage to a second input terminal of the first comparator, wherein a voltage value of the reference voltage is set to be between the first reference voltage and the second reference voltage;
and S40, the first comparator compares the comparison voltage with the voltage value of the reference voltage and outputs a control signal for judging whether to start over-current protection.
2. The method according to claim 1, wherein in S10, the current integration circuit includes a second comparator, a resistor, and a capacitor, an input terminal of the resistor is connected to a current signal, an output terminal of the resistor is connected to an inverting input terminal of the second comparator, a first connection terminal of the capacitor is connected to an output terminal of the resistor, a second connection terminal of the capacitor is connected to an output terminal of the second comparator, and a forward input terminal of the second comparator is grounded.
3. The method of claim 2, wherein the relationship between the current input to the current integration circuit and the comparison voltage output is:
4. The method of claim 2,
a first input end of the first comparator is a reverse output end, and a second input end of the first comparator is a forward output end;
the output end of the second comparator is connected with the reverse output end of the first input end, and the forward output end of the first comparator is connected with a reference voltage signal.
5. The method of claim 1,
specifically, the S20 includes:
s201, obtaining a waveform diagram of a first current, wherein the waveform diagram of the first current is an abnormal circuit waveform needing overcurrent protection, the waveform diagram comprises a Y coordinate axis representing a current value and an X coordinate axis representing time, a first region is formed between the waveform of the first current and the Y coordinate axis and between the waveform of the first current and the X coordinate axis, the area of the first region is the integral of the first current with respect to time, the integral of the first current with respect to time is the output voltage of the current integrating circuit, and the output voltage of the current integrating circuit corresponding to the area of the first region is set as a first reference voltage;
s202, obtaining a waveform diagram of a second current, wherein the waveform diagram of the second current is an abnormal circuit waveform without overcurrent protection, the waveform diagram comprises a Y coordinate axis representing a current value and an X coordinate axis representing time, a second region is formed between the waveform of the second current and the Y coordinate axis and the X coordinate axis, the area of the second region is the integral of the second current with respect to time, the integral of the second current with respect to time is the output voltage of the current integrating circuit, and the output voltage of the current integrating circuit corresponding to the area of the second region is set as a second reference voltage.
6. The method according to claim 5, wherein in the step S30, the voltage value of the first reference voltage is greater than the voltage value of the second reference voltage; the voltage value of the reference voltage is smaller than that of the first reference voltage and larger than that of the second reference voltage.
7. The method according to claim 6, wherein the first comparator outputs a control signal for activating overcurrent protection when the voltage value of the comparison voltage is greater than the voltage value of the reference voltage.
8. A GOA circuit comprising a level shift circuit, the level shift circuit comprising:
the current integrating circuit is used for outputting comparison voltage after the input current is amplified;
a first connection end of the first comparator is connected with the output end of the current integrating circuit to receive the comparison voltage, and a second connection end of the first comparator is connected with a reference voltage;
after the comparison voltage and the voltage value of the reference voltage are compared by the first comparator, a control signal for judging whether to start overcurrent protection is output;
wherein the level shift circuit obtains a first reference voltage and a second reference voltage;
wherein the obtaining of the first reference voltage and the second reference voltage by the level shift circuit comprises:
the level conversion circuit acquires a waveform diagram of a first current, wherein the waveform diagram of the first current is an abnormal circuit waveform needing overcurrent protection, acquires an output voltage of the first current, and sets the output voltage as a first reference voltage;
the level conversion circuit acquires a waveform diagram of a second current, wherein the waveform diagram of the second current is an abnormal circuit waveform without overcurrent protection, acquires an output voltage of the second current, and sets the output voltage as a second reference voltage.
9. The GOA circuit of claim 8, wherein the current integrator circuit comprises a second comparator, a resistor, and a capacitor, wherein an input of the resistor is connected to a current signal, an output of the resistor is connected to an inverting input of the second comparator, a first connection of the capacitor is connected to an output of the resistor, a second connection of the capacitor is connected to an output of the second comparator, and a forward input of the second comparator is grounded.
10. The GOA circuit of claim 9, wherein the relationship between the current input to the current integration circuit and the comparison voltage output is:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810100043.5A CN108303581B (en) | 2018-02-01 | 2018-02-01 | GOA circuit and GOA circuit overcurrent protection detection method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810100043.5A CN108303581B (en) | 2018-02-01 | 2018-02-01 | GOA circuit and GOA circuit overcurrent protection detection method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108303581A CN108303581A (en) | 2018-07-20 |
| CN108303581B true CN108303581B (en) | 2020-05-22 |
Family
ID=62850876
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810100043.5A Active CN108303581B (en) | 2018-02-01 | 2018-02-01 | GOA circuit and GOA circuit overcurrent protection detection method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108303581B (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109346019B (en) * | 2018-11-22 | 2020-07-10 | 深圳市华星光电技术有限公司 | Overcurrent protection control circuit for level shift circuit |
| CN109617008B (en) * | 2018-12-12 | 2021-02-02 | 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 |
| CN111312194B (en) * | 2020-04-03 | 2021-06-22 | 苏州华星光电技术有限公司 | 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 |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101860001A (en) * | 2010-05-06 | 2010-10-13 | 北京鼎汉技术股份有限公司 | Switch power supply current detection circuit |
| CN101963629A (en) * | 2009-07-24 | 2011-02-02 | 瑞萨电子(中国)有限公司 | Current detection device and method |
| CN104781751A (en) * | 2012-12-14 | 2015-07-15 | 英特尔公司 | Method and apparatus for managing computing system power |
| CN105004910A (en) * | 2014-04-22 | 2015-10-28 | 中兴通讯股份有限公司 | Current detection method and apparatus of PFC inductor |
| CN105448260A (en) * | 2015-12-29 | 2016-03-30 | 深圳市华星光电技术有限公司 | Overcurrent protection circuit and liquid crystal display |
| CN106991988A (en) * | 2017-05-17 | 2017-07-28 | 深圳市华星光电技术有限公司 | The over-current protection system and method for GOA circuits |
| CN107529676A (en) * | 2017-08-16 | 2018-01-02 | 中国电子科技集团公司第十八研究所 | A kind of space power system charge control current foldback circuit |
-
2018
- 2018-02-01 CN CN201810100043.5A patent/CN108303581B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101963629A (en) * | 2009-07-24 | 2011-02-02 | 瑞萨电子(中国)有限公司 | Current detection device and method |
| CN101860001A (en) * | 2010-05-06 | 2010-10-13 | 北京鼎汉技术股份有限公司 | Switch power supply current detection circuit |
| CN104781751A (en) * | 2012-12-14 | 2015-07-15 | 英特尔公司 | Method and apparatus for managing computing system power |
| CN105004910A (en) * | 2014-04-22 | 2015-10-28 | 中兴通讯股份有限公司 | Current detection method and apparatus of PFC inductor |
| CN105448260A (en) * | 2015-12-29 | 2016-03-30 | 深圳市华星光电技术有限公司 | Overcurrent protection circuit and liquid crystal display |
| CN106991988A (en) * | 2017-05-17 | 2017-07-28 | 深圳市华星光电技术有限公司 | The over-current protection system and method for GOA circuits |
| CN107529676A (en) * | 2017-08-16 | 2018-01-02 | 中国电子科技集团公司第十八研究所 | A kind of space power system charge control current foldback circuit |
Also Published As
| Publication number | Publication date |
|---|---|
| CN108303581A (en) | 2018-07-20 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN108303581B (en) | GOA circuit and GOA circuit overcurrent protection detection method | |
| US10914993B2 (en) | Electrostatic protection method, electrostatic protection apparatus, and liquid crystal display | |
| WO2017041324A1 (en) | Protective circuit and liquid crystal display with protective circuit | |
| US10290244B2 (en) | Display panel and overcurrent protection circuit of gate driver on array circuit for display panel | |
| US10816835B2 (en) | Display driving chip and liquid crystal display device | |
| WO2017185422A1 (en) | Overcurrent protection circuit and liquid crystal display | |
| US20180151142A1 (en) | Lcd tv, lcd panel, and short-circuit protection method thereof | |
| EP3657486A1 (en) | Clock signal output circuit, and liquid crystal display device | |
| US11966129B2 (en) | Display panel static electricity protection device, display panel static electricity protection method, and display device | |
| US10643575B2 (en) | Clock signal auxiliary circuit, and display device | |
| US11966128B2 (en) | Display panel static electricity protection device, static electricity protection method, and display device | |
| US20210304694A1 (en) | Over-current protection method for display panel and display device | |
| WO2020248856A1 (en) | Overcurrent protection circuit, method for driving overcurrent protection circuit, and display device | |
| CN110264925B (en) | Display device and short circuit detection method thereof | |
| US11038343B2 (en) | Drive circuit and method for correcting internal overcurrent setting value thereof | |
| US11322928B2 (en) | Over-voltage protection method and device | |
| US20030071767A1 (en) | Apparatus and method for preventing lock-up of LCD in mobile terminal | |
| US20200135071A1 (en) | Circuit and method for detecting short circuit of common electrode wiring | |
| US8749214B2 (en) | Power circuit and circuit board, electrical device using the same | |
| WO2020103308A1 (en) | Overcurrent protection control circuit for use in level shift circuit | |
| US20220036843A1 (en) | Drive circuitry of display panel, and display device | |
| CN110782857A (en) | Display device and driving method thereof | |
| US20190073981A1 (en) | Gate driver on array driving circuit and liquid crystal display device having the same | |
| US20230245626A1 (en) | Overvoltage protection circuit, overvoltage protection device, display panel and display | |
| US20080180418A1 (en) | Liquid crystal panel control circuit having reset circuit and liquid crystal display driving circuit with same |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CP01 | Change in the name or title of a patent holder | ||
| CP01 | Change in the name or title of a patent holder |
Address after: 9-2 Tangming Avenue, Guangming New District, Shenzhen City, Guangdong Province Patentee after: TCL Huaxing Photoelectric Technology Co.,Ltd. Address before: 9-2 Tangming Avenue, Guangming New District, Shenzhen City, Guangdong Province Patentee before: Shenzhen China Star Optoelectronics Technology Co.,Ltd. |