CN107742493A - A kind of drive circuit and driving method - Google Patents
A kind of drive circuit and driving method Download PDFInfo
- Publication number
- CN107742493A CN107742493A CN201711116917.8A CN201711116917A CN107742493A CN 107742493 A CN107742493 A CN 107742493A CN 201711116917 A CN201711116917 A CN 201711116917A CN 107742493 A CN107742493 A CN 107742493A
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- Prior art keywords
- level shifting
- module
- shifting circuit
- electric current
- record
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Classifications
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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
- G09G3/006—Electronic inspection or testing of displays and display drivers, e.g. of LED or LCD displays
-
- 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
- G09G3/3696—Generation of voltages supplied to electrode drivers
Abstract
Drive circuit and driving method provided by the invention; by setting overcurrent protection module to carry out output control to level shifting circuit; wherein; the overcurrent protection module includes detection module, judge module, counting module and short circuit protection module; electric current can be detected in real time with simple and effective; and it is rapidly performed by protecting after short circuit occurs; the short dot heating for being effectively prevented the panel because of caused by short circuit burns out, melts screen and phenomenon on fire generation, effectively prevents the generation of potential safety hazard.
Description
Technical field
The present invention relates to field of liquid crystal display, and in particular to a kind of drive circuit and driving method.
Background technology
GOA (Gate On Array, grid integrated driving) technology is the trend of current liquid crystal display panel development, is used
GOA technologies can effectively save the use of FPC, wherein, the signal needed in GOA driver circuits is by level conversion
Each output of circuit provides.
In current liquid crystal panel manufacture process, easily cause the cabling short circuit for being in liquid crystal panel border area, particularly level
Short circuit between each output end of change-over circuit, and because the output of level shifting circuit is the anaplasia in high voltage and low-voltage
Change, pressure difference therein can be in more than 35V, and short circuit causes larger pressure difference and electric current, this larger pressure difference and electric current meeting
Cause panel to be burnt out in short dot heating, even result in molten screen and phenomenon on fire occurs, bring great potential safety hazard.
The content of the invention
The embodiment of the present invention provides a kind of drive circuit and driving method.
A kind of drive circuit, including：Level shifting circuit and the overcurrent protection module being connected with the level shifting circuit；
Wherein,
The overcurrent protection module includes：
Detection module, its input are electrically connected to the current sense terminal of the level shifting circuit, and the detection module is used
In the electric current for detecting the level shifting circuit output；
Judge module, its input are electrically connected to the output end of the detection module, and the judge module is used to judge institute
State whether the electric current that detection module detects is more than default current threshold, and will determine that result is sent to counting module；
The counting module, it is electrically connected to the judge module, and the counting module is used in a detection cycle,
The judged result for recording the judge module is that the electric current detected is more than the number of default current threshold, to obtain the first note
Record value；
Short circuit protection module, its input are electrically connected to the counting module, the output end electrical connection of the short block
To the control terminal of the level shifting circuit, in a detection cycle, being recorded when first record value is more than first
During threshold value, controlling the level shifting circuit to stop output voltage or the control level shifting circuit reduces output voltage.
In the drive circuit of the present invention, the counting module is additionally operable in a detection cycle, records the judgement
The judged result of module is that the electric current detected is less than or equal to the number of default current threshold, to obtain the second record value；
The short circuit protection module, it is additionally operable in a detection cycle, when second record value is less than the second record
During threshold value, controlling the level shifting circuit to stop output voltage or the control level shifting circuit reduces output voltage.
In the drive circuit of the present invention, the electric current for the level shifting circuit output that the detection module detects
Number is first record value and the second record value sum.
In the drive circuit of the present invention, when the detection cycle is set as the grid that the level shifting circuit receives
The clock cycle.
In the drive circuit of the present invention, in a detection cycle, the level that the detection module detects turns
The number for changing the electric current of circuit output is the gate clock cycle and the dutycycle of detecting frequency and gate clock signal
Product, wherein, the detecting frequency is the detecting number in the unit time.
A kind of driving method, it comprises the following steps：
Detect the electric current of level shifting circuit output；
Judge whether the electric current of the level shifting circuit output is more than default current threshold；
In a detection cycle, the number that the electric current detected is more than default current threshold is recorded, to obtain first
Record value；
When first record value is more than the first record threshold value, control the level shifting circuit stop output voltage or
Person controls the level shifting circuit to reduce output voltage.
In the driving method of the present invention, the driving method also includes：
In a detection cycle, the number that the electric current detected is less than or equal to default current threshold is recorded, to obtain
Second record value；
When second record value is less than the second record threshold value, control the level shifting circuit stop output voltage or
Person controls the level shifting circuit to reduce output voltage.
In the driving method of the present invention, the number of the electric current of the level shifting circuit that detects output is described the
One record value and the second record value sum.
In the driving method of the present invention, when the detection cycle is set as the grid that the level shifting circuit receives
The clock cycle.
In the driving method of the present invention, in a detection cycle, the level that the detection module detects turns
The number for changing the electric current of circuit output is the gate clock cycle and the dutycycle of detecting frequency and gate clock signal
Product, wherein, the detecting frequency is the detecting number in the unit time.
The drive circuit and driving method of offer of the present invention, by setting overcurrent protection module to level shifting circuit
Output control is carried out, wherein, the overcurrent protection module includes detection module, judge module, counting module and short-circuit protection mould
Block, the electric current of detection module detection level shifting circuit output, judge module judge that the electric current that the detection module detects is
It is no to be more than default current threshold, and will determine that result is sent to counting module, counting module then in a detection cycle, is remembered
The judged result for recording the judge module is that the electric current detected is more than the number of default current threshold, to obtain the first record
Value, short circuit protection module is then in a detection cycle, when first record value is more than the first record threshold value, described in control
Level shifting circuit, which stops output voltage or the control level shifting circuit, reduces output voltage, simple and effective to electric current
Detected in real time, and be rapidly performed by protecting after short circuit occurs, be effectively prevented the panel because of caused by short circuit
Short dot heating is burnt out, molten screen and phenomenon on fire occur, and effectively prevents the generation of potential safety hazard.
Brief description of the drawings
Technical scheme in order to illustrate the embodiments of the present invention more clearly, make required in being described below to embodiment
Accompanying drawing is briefly described, it should be apparent that, drawings in the following description are only some embodiments of the present invention, for
For those skilled in the art, on the premise of not paying creative work, it can also be obtained according to these accompanying drawings other attached
Figure.
Fig. 1 is the electrical block diagram of drive circuit provided in an embodiment of the present invention.
Fig. 2 is the detecting result schematic diagram of drive circuit provided in an embodiment of the present invention.
Fig. 3 is the schematic flow sheet of driving method provided in an embodiment of the present invention.
Fig. 4 is another schematic flow sheet of driving method provided in an embodiment of the present invention.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Site preparation describes.Obviously, described embodiment is only part of the embodiment of the present invention, rather than whole embodiments.It is based on
Embodiment in the present invention, the every other implementation that those skilled in the art are obtained under the premise of creative work is not made
Example, belongs to the scope of protection of the invention.
The embodiment of the present invention provides a kind of drive circuit, and it includes level shifting circuit and connected with the level shifting circuit
The overcurrent protection module connect, wherein, the overcurrent protection module is used for the electric current for detecting level shifting circuit output, and controls and be somebody's turn to do
Level shifting circuit stops output voltage or controls the level shifting circuit to reduce output voltage.It is provided in an embodiment of the present invention
Drive circuit can be entered by setting overcurrent protection module to carry out output control to level shifting circuit with simple and effective to electric current
Row detecting in real time, and be rapidly performed by protecting after short circuit occurs, it is effectively prevented the short of because of caused by short circuit panel
Waypoint heating is burnt out, molten screen and phenomenon on fire occur, and effectively prevents the generation of potential safety hazard.
Refering to Fig. 1, Fig. 1 is the electrical block diagram of drive circuit provided in an embodiment of the present invention.As shown in figure 1, this
Inventive embodiments provide a kind of drive circuit, and it includes level shifting circuit 1 and the overcurrent protection being connected with level shifting circuit 1
Module 2.Wherein, the level shifting circuit 1 includes voltage input end A, voltage output end B, current sense terminal C and control terminal D.
The drive circuit of the embodiment of the present invention detects whether level shifting circuit 1 produces by setting overcurrent protection module 2
Raw short circuit current, and short-circuit protection is provided.Wherein, the current sense terminal C and control terminal D of level shifting circuit 1 protect with excessively stream
Shield module 2 is connected, and overcurrent protection module 2 is detected by the current sense terminal C of level shifting circuit 1 to electric current, and is passed through
The control terminal D output control signals of level shifting circuit 1, to control, level shifting circuit 1 stops output voltage or control should
Level shifting circuit 1 reduces output voltage.
For example, the input A of the drive circuit 1, control terminal B are multiple, it is defeated that each input A inputs a clock
Enter signal CPV, each clock input signal CPV and the conversion of high and low level is carried out under the control of overcurrent protection module 2, so that
Obtain the output end B output gate clock signals CKV of the drive circuit.
Further, the overcurrent protection module 2 includes：Detection module 21, judge module 22, counting module 23 and short circuit
Protection module 24.
Wherein, detection module 21, its input are electrically connected to the current sense terminal C of level shifting circuit 1, detection module 21
For detecting the electric current of the output of level shifting circuit 1.
Judge module 22, its input are electrically connected to the output end of detection module 21, and judge module 22 is used to judge to detect
Whether the electric current that module 21 detects is more than default current threshold, and will determine that result is sent to counting module 23.In this reality
Apply in example, the default current threshold is the electric current for flowing through the level shifting circuit 1 under normal circumstances.
Specifically, referring to Fig. 2, Fig. 2 is the detecting result schematic diagram of drive circuit provided in an embodiment of the present invention.Will detection
The electric current that module 21 detects is compared with default current threshold, as shown in Fig. 2 institute in the default current threshold such as figure
Show, it can be seen that when the electric current that detection module 21 detects exceeds default current threshold, then judge that the electric current is
Short circuit current；In addition, if the electric current that detection module 21 detects judges the electric current for just without departing from default current threshold
Normal electric current.
Counting module 23, it is electrically connected to judge module 22, and counting module 23 is used in a detection cycle, and record is sentenced
The judged result of disconnected module 22 is that the electric current detected is more than the number of default current threshold, to obtain the first record value.
In the present embodiment, the detection cycle is set as the gate clock cycle that the level shifting circuit 1 receives, i.e., in the present embodiment
It is to carry out current sense between each gate clock signal CKV high period.
Specifically, in a detection cycle, time of the electric current for the output of level shifting circuit 1 that detection module 21 detects
Number is the product of gate clock cycle and detecting frequency and gate clock signal CKV dutycycle, wherein, detecting frequency is single
Detecting number in the time of position.The detecting frequency of the drive circuit can be set by outside.
If for example, gate clock signal CKV pulse period is 1/20K, detecting frequency is set as 20M, then
One high level and the data measured in the low level cycle are 1000 times, if gate clock signal CKV dutycycle is
50%, then the number for detecting electric current in a detection cycle is 500 times, then the number of short circuit current and normal current is total
With for 500 times.
Short circuit protection module 24, its input are electrically connected to the counting module 23, and the output end of short block 24 is electrically connected
The control terminal D of level shifting circuit 1 is connected to, in a detection cycle, threshold value to be recorded when the first record value is more than first
When, control level shifting circuit 1, which stops output voltage or control level shifting circuit 1, reduces output voltage.In the present embodiment
In, the first record threshold value is the pole that the electric current that the drive circuit detects under short-circuit conditions is more than the number of default current threshold
Limit value.
Particularly, the counting module 23 is additionally operable in a detection cycle, and the judged result of record judge module 22 is
The electric current detected is less than or equal to the number of default current threshold, to obtain the second record value.Wherein, detection module 21 detects
The number for the electric current that the level shifting circuit 1 arrived exports is the first record value and the second record value sum.
Short circuit protection module 24, it is additionally operable in a detection cycle, when the second record value is less than the second record threshold value,
Controlling level shifting circuit 1 to stop output voltage or control level shifting circuit 1 reduces output voltage.In the present embodiment,
Second record threshold value is more than the limit of the number of default current threshold for the electric current that the drive circuit detects under normal circumstances
Value.
Drive circuit provided in an embodiment of the present invention, by setting overcurrent protection module to export level shifting circuit
Control, wherein, the overcurrent protection module includes detection module, judge module, counting module and short circuit protection module, detects mould
The electric current of block detection level shifting circuit output, it is default that judge module judges whether the electric current that the detection module detects is more than
Current threshold, and will determine that result is sent to counting module, counting module then in a detection cycle, records the judgement
The judged result of module is that the electric current detected is more than the number of default current threshold, and to obtain the first record value, short circuit is protected
Module is protected then in a detection cycle, when first record value is more than the first record threshold value, controls the level conversion
Circuit, which stops output voltage or the control level shifting circuit, reduces output voltage, simple and effective that electric current is carried out in real time
Detecting, and short circuit occur after be rapidly performed by protecting, be effectively prevented the panel because of caused by short circuit short dot hair
Heat is burnt out, molten screen and phenomenon on fire occur, and effectively prevents the generation of potential safety hazard.
Refering to Fig. 3, Fig. 3 is the schematic flow sheet of driving method provided in an embodiment of the present invention.It is as shown in figure 3, of the invention
Embodiment provides a kind of driving method, including following each step：
Step S101, the electric current of detection level shifting circuit output；
Step S102, judges whether the electric current of the level shifting circuit output is more than default current threshold；
Step S103, in a detection cycle, the number that the electric current detected is more than default current threshold is recorded, with
Obtain the first record value；
Step S104, when first record value is more than the first record threshold value, the level shifting circuit is controlled to stop
Output voltage or the control level shifting circuit reduce output voltage.
Wherein, the number of the electric current of the level shifting circuit output detected is first record value and described the
Two record value sums.
Wherein, the detection cycle is set as the gate clock cycle that the level shifting circuit receives.
Wherein, in a detection cycle, the electric current for the level shifting circuit output that the detection module detects
Number for the gate clock cycle and detecting frequency product, wherein, the detecting frequency is the detecting in the unit time
Number.
Further, referring to Fig. 4, Fig. 4 is another schematic flow sheet of driving method provided in an embodiment of the present invention.Such as
Shown in Fig. 4, the driving method, including following steps：
Step S201, the electric current of detection level shifting circuit output；
Step S202, judges whether the electric current of the level shifting circuit output is more than default current threshold；
Step S203, in a detection cycle, record time that the electric current detected is less than or equal to default current threshold
Number, to obtain the second record value；
Step S204, when second record value is less than the second record threshold value, the level shifting circuit is controlled to stop
Output voltage or the control level shifting circuit reduce output voltage.
The driving method that the present embodiment provides is that the framework based on above-mentioned drive circuit is driven, and its specific implementation can be joined
According to described by above drive circuit embodiment, will not be described here.
The drive circuit and driving method of offer of the present invention, by setting overcurrent protection module to level shifting circuit
Output control is carried out, wherein, the overcurrent protection module includes detection module, judge module, counting module and short-circuit protection mould
Block, the electric current of detection module detection level shifting circuit output, judge module judge that the electric current that the detection module detects is
It is no to be more than default current threshold, and will determine that result is sent to counting module, counting module then in a detection cycle, is remembered
The judged result for recording the judge module is that the electric current detected is more than the number of default current threshold, to obtain the first record
Value, short circuit protection module is then in a detection cycle, when first record value is more than the first record threshold value, described in control
Level shifting circuit, which stops output voltage or the control level shifting circuit, reduces output voltage, simple and effective to electric current
Detected in real time, and be rapidly performed by protecting after short circuit occurs, be effectively prevented the panel because of caused by short circuit
Short dot heating is burnt out, molten screen and phenomenon on fire occur, and effectively prevents the generation of potential safety hazard.
LCD assembly provided in an embodiment of the present invention is described in detail above, it is used herein specifically individual
Example is set forth to the principle and embodiment of the present invention, and the explanation of above example is only intended to help and understands the present invention.
Meanwhile for those skilled in the art, according to the thought of the present invention, have change in specific embodiments and applications
Become part, in summary, this specification content should not be construed as limiting the invention.
Claims (10)
- A kind of 1. drive circuit, it is characterised in that including：Level shifting circuit and the excessively stream being connected with the level shifting circuit Protection module；Wherein,The overcurrent protection module includes：Detection module, its input are electrically connected to the current sense terminal of the level shifting circuit, and the detection module is used to examine Survey the electric current of the level shifting circuit output；Judge module, its input are electrically connected to the output end of the detection module, and the judge module is used to judge the inspection Survey whether the electric current that module detects is more than default current threshold, and will determine that result is sent to counting module；The counting module, it is electrically connected to the judge module, and the counting module is used in a detection cycle, record The judged result of the judge module is that the electric current detected is more than the number of default current threshold, to obtain the first record Value；Short circuit protection module, its input are electrically connected to the counting module, and the output end of the short block is electrically connected to institute The control terminal of level shifting circuit is stated, in a detection cycle, threshold value to be recorded when first record value is more than first When, controlling the level shifting circuit to stop output voltage or the control level shifting circuit reduces output voltage.
- 2. drive circuit according to claim 1, it is characterised in that the counting module is additionally operable in a detection cycle Interior, the judged result for recording the judge module is that the electric current detected is less than or equal to the number of default current threshold, with To the second record value；The short circuit protection module, it is additionally operable in a detection cycle, when second record value is less than the second record threshold value When, controlling the level shifting circuit to stop output voltage or the control level shifting circuit reduces output voltage.
- 3. drive circuit according to claim 2, it is characterised in that the level conversion that the detection module detects The number of the electric current of circuit output is first record value and the second record value sum.
- 4. drive circuit according to claim 1, it is characterised in that the detection cycle is set as the level conversion electricity The gate clock cycle that road receives.
- 5. drive circuit according to claim 4, it is characterised in that in a detection cycle, the detection module inspection When the number of the electric current of the level shifting circuit output measured is the gate clock cycle and detecting frequency and grid The product of the dutycycle of clock signal, wherein, the detecting frequency is the detecting number in the unit time.
- 6. a kind of driving method, it is characterised in that comprise the following steps：Detect the electric current of level shifting circuit output；Judge whether the electric current of the level shifting circuit output is more than default current threshold；In a detection cycle, the number that the electric current detected is more than default current threshold is recorded, to obtain the first record Value；When first record value is more than the first record threshold value, the level shifting circuit is controlled to stop output voltage or control Making the level shifting circuit reduces output voltage.
- 7. driving method according to claim 6, it is characterised in that the driving method also includes：In a detection cycle, the number that the electric current detected is less than or equal to default current threshold is recorded, to obtain second Record value；When second record value is less than the second record threshold value, the level shifting circuit is controlled to stop output voltage or control Making the level shifting circuit reduces output voltage.
- 8. driving method according to claim 7, it is characterised in that the electricity of the level shifting circuit output detected The number of stream is first record value and the second record value sum.
- 9. driving method according to claim 6, it is characterised in that the detection cycle is set as the level conversion electricity The gate clock cycle that road receives.
- 10. driving method according to claim 9, it is characterised in that in a detection cycle, the detection module inspection When the number of the electric current of the level shifting circuit output measured is the gate clock cycle and detecting frequency and grid The product of the dutycycle of clock signal, wherein, the detecting frequency is the detecting number in the unit time.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711116917.8A CN107742493B (en) | 2017-11-13 | 2017-11-13 | Driving circuit and driving method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711116917.8A CN107742493B (en) | 2017-11-13 | 2017-11-13 | Driving circuit and driving method |
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| CN107742493B CN107742493B (en) | 2020-03-17 |
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| CN111986611B (en) * | 2020-09-14 | 2023-09-26 | 合肥京东方显示技术有限公司 | Protection circuit for display device, display device thereof, and method for protecting display device using protection circuit |
| US11900856B2 (en) | 2020-09-14 | 2024-02-13 | Hefei Boe Display Technology Co., Ltd. | Protection circuit for display device and display device comprising same, and method for protecting display device using protection circuit |
| CN114241968A (en) * | 2021-12-15 | 2022-03-25 | 惠州视维新技术有限公司 | GOA circuit with adjusting function, adjusting method and display panel |
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| CN107742493B (en) | 2020-03-17 |
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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. |