CN107578754A - The over-current protection system and overcurrent protection method of liquid crystal display panel - Google Patents
The over-current protection system and overcurrent protection method of liquid crystal display panel Download PDFInfo
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- CN107578754A CN107578754A CN201710900683.XA CN201710900683A CN107578754A CN 107578754 A CN107578754 A CN 107578754A CN 201710900683 A CN201710900683 A CN 201710900683A CN 107578754 A CN107578754 A CN 107578754A
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Abstract
The present invention provides a kind of over-current protection system and overcurrent protection method of liquid crystal display panel.The system includes：Time schedule controller and the power management chip being electrically connected with time schedule controller；Time schedule controller includes：Current monitoring module and the I2C host modules being electrically connected with current monitoring module；Power management chip includes：Output module, I2C slaves module and analog-to-digital conversion module；I2C host modules are electrically connected with the I2C slaves module, and analog-to-digital conversion module is electrically connected with the I2C slaves module and output module；Control analog-to-digital conversion module can be coordinated to show that the stage completes collection and the analog-to-digital conversion of electric current in the blank of the frame picture of liquid crystal display panel one by I2C host modules and I2C slaves module; lift the accuracy of power management chip excessively stream detecting; the effectively internal circuit of protection liquid crystal display panel; avoid liquid crystal display panel excessively stream from burning, reduce enterprise's production loss.
Description
Technical field
The present invention relates to display technology field, more particularly to the over-current protection system of a kind of liquid crystal display panel and excessively electric
Flow guard method.
Background technology
With the development of Display Technique, the plane such as liquid crystal display (Liquid Crystal Display, LCD) display dress
Put because having the advantages that high image quality, power saving, fuselage is thin and has a wide range of application, and be widely used in mobile phone, TV, individual number
The various consumption electronic products such as word assistant, digital camera, notebook computer, desktop computer, turn into the master in display device
Stream.
It is backlight liquid crystal display that liquid crystal display device on existing market is most of, it include liquid crystal display panel and
Backlight module (backlight module).The operation principle of liquid crystal display panel is put among the parallel glass substrate of two panels
Liquid crystal molecule is put, there are many tiny electric wires vertically and horizontally among two panels glass substrate, liquid crystal is controlled by whether being powered
Molecular changes direction, the light of backlight module is reflected into generation picture.
Mainly include time schedule controller (TCON), gate drivers (GATE in the drive system of liquid crystal display panel
) and source electrode driver (SOURCE DRIVER) DRIVER.Time schedule controller mainly be responsible for send out driving liquid crystal display panel when
Sequence signal drives liquid crystal display panel to gate drivers and source electrode driver, and gate drivers major function is to scan line
There is provided scanning signal, the major function of source electrode driver is provides data-signal to data wire.
Power management chip is that very important chip, power management chip are carried on a shoulder pole in electronic apparatus system in electronic equipment
The responsibility of conversion to electric energy, distribution, detection and other electric energy managements is shouldered, liquid crystal display panel also has begun to use at present
Special power management chip (PMIC) provides the voltages such as high voltage (VGH), low-voltage (VGL), common electric voltage (VCOM) to enter
Row driving display.Partial liquid crystal display panel due to the factor such as usage time is long, processing procedure defect or component fitting are improper, VGH,
VGL or VCOM etc. occurs short circuit and causes excessively stream, makes liquid crystal display panel that temperature overheating occur and burn, after burning often only
Processing can be scrapped, certain loss is caused to liquid crystal display panel enterprise.It is directly right by PMIC to have occurred on the market
VGH, VGL and VCOM carry out the scheme of hardware overcurrent protection (OCP) detecting, but this method is in a short period of time to certain
Road circuit detecting often just enables overcurrent protection within the time of only microsecond (us) rank, exists and easily detect by mistake to after excessively stream
The shortcomings that survey.
The content of the invention
It is an object of the invention to a kind of over-current protection system of liquid crystal display panel, power management chip can be lifted
The accuracy of excessively stream detecting, effectively protects the internal circuit of liquid crystal display panel, avoids liquid crystal display panel excessively stream from burning, and reduces
Enterprise's production loss.
The present invention also aims to a kind of overcurrent protection method of liquid crystal display panel, power management core can be lifted
The accuracy of piece excessively stream detecting, effectively protects the internal circuit of liquid crystal display panel, avoids liquid crystal display panel excessively stream from burning, and drops
Low enterprise's production loss.
To achieve the above object, the invention provides a kind of over-current protection system of liquid crystal display panel, including：Sequential
Controller and the power management chip being electrically connected with the time schedule controller；
The time schedule controller includes：Current monitoring module and the I2C master being electrically connected with the current monitoring module
Machine module；The power management chip includes：Output module, with the output module be electrically connected with I2C slaves module and
Analog-to-digital conversion module；The I2C host modules and the I2C slaves module are electrically connected with, the analog-to-digital conversion module with it is described
I2C slaves module and output module are electrically connected with；
The I2C host modules, for sending the first instruction and the second instruction to the I2C slaves module；
The output module, for liquid crystal display panel output driving current, the driving current to be analog signal；
The I2C slaves module, turn for receiving the first instruction and the second instruction from I2C host modules and being sent to modulus
Change the mold block；
The analog-to-digital conversion module, the driving current exported for the output module according to the first instruction acquisition, and will
The driving current of collection carries out analog-to-digital conversion, generates data signal, and the data signal is sent into electricity according to the second instruction
Flow monitoring module；
The current monitoring module, for according to the data signal that receives determine the driving current whether excessively stream, and
Output module in the driving current excessively stream via I2C host modules and from I2C slaves module to the power management chip
Send the instruction for starting overcurrent protection；
Wherein, the time that the I2C host modules send the first instruction to the I2C slaves module is the very first time, institute
State I2C slaves module driving current since I2C host modules have received the first time instructed and the analog-to-digital conversion module
Collection and time of analog-to-digital conversion be the second time, the analog-to-digital conversion module completes the collection of driving current and modulus turns
The time changed was the 3rd time, when the time that the I2C host modules instruct to I2C slaves module transmission second is the 4th
Between；
The very first time is located at effective display stage of the frame picture of liquid crystal display panel one, second time and
The blank that 3rd time was respectively positioned on the frame picture where the very first time shows the stage, and the 4th time is positioned at described the
Effective display stage of the next frame picture of a frame picture where one time.
The time schedule controller also includes：The clock signal counting module and and clock being electrically connected with I2C host modules
The clock signal output module that signal-count module is electrically connected with；
The clock signal output module is used to export clock signal, and the clock signal counting module, which is used to record, to be exported
Clock signal number of pulses；
The number of pulses that the I2C host modules record according to the clock signal counting module determines the very first time, institute
The very first time is stated as time of the number of pulses that the clock signal counting module records equal to default destination number.
The stage is shown in the blank of a frame picture of the liquid crystal display panel, the clock signal output module output
Clock signal is in low potential all the time.
The clock signal counting module determines the clock signal of output according to the rising edge quantity of the clock signal
Number of pulses.
The over-current protection system is applied in the liquid crystal display panel that picture refreshing frequency is 50Hz or 60Hz.
The output module includes：Multiple output channels, the multiple output channel export different driving currents respectively.
The current monitoring module obtains one and compared by the way that the data signal and default excessively stream threshold value are compared
As a result, and according to relatively cross judge the driving current whether excessively stream.
The present invention also provides a kind of overcurrent protection method of liquid crystal display panel, applied to above-mentioned liquid crystal display panel
Over-current protection system, comprise the following steps：
Step S1, for output module to liquid crystal display panel output driving current, the driving current is analog signal；
Step S2, described I2C host modules to the I2C slaves module send first instruction, the I2C slaves module from
I2C host modules receive first and instruct and be sent to analog-to-digital conversion module；Wherein, the I2C host modules are to the I2C slaves
The time that module sends the first instruction is the very first time, and the I2C slaves module has received the first instruction from I2C host modules
Time was the second time；
Step S3, the driving current that described analog-to-digital conversion module output module according to the first instruction acquisition exports, and
The driving current of collection is subjected to analog-to-digital conversion, generates data signal；Wherein, the analog-to-digital conversion module starts driving current
Collection and time of analog-to-digital conversion be the second time, the collection of the analog-to-digital conversion module completion driving current and analog-to-digital conversion
Time was the 3rd time；
Step S4, described I2C host modules to the I2C slaves module send second instruction, the I2C slaves module from
I2C host modules receive second and instruct and be sent to analog-to-digital conversion module；Wherein, the I2C host modules are to the I2C slaves
The time that module sends the second instruction was the 4th time；
The data signal is sent to current monitoring module by step S5, described analog-to-digital conversion module according to the second instruction；
Step S6, described current monitoring module according to the data signal received determine the driving current whether excessively stream,
And in the driving current excessively stream via the output mould of I2C host modules and I2C slaves module to the power management chip
Block sends the instruction for starting overcurrent protection；
The very first time is located at effective display stage of the frame picture of liquid crystal display panel one, second time and
The blank that 3rd time was respectively positioned on the frame picture where the very first time shows the stage, and the 4th time is positioned at described the
Effective display stage of the next frame picture of a frame picture where one time.
Beneficial effects of the present invention：The present invention provides a kind of over-current protection system of liquid crystal display panel, including：Sequential
Controller and the power management chip being electrically connected with the time schedule controller；The time schedule controller includes：Current monitoring
Module and the I2C host modules being electrically connected with current monitoring module；The power management chip includes：Output module, with
The I2C slaves module and analog-to-digital conversion module that the output module is electrically connected with；The I2C host modules and the I2C from
Machine module is electrically connected with, and the analog-to-digital conversion module is electrically connected with the I2C slaves module and output module；Institute can be passed through
State I2C host modules and coordinate the control analog-to-digital conversion module in the frame of liquid crystal display panel one with the I2C slaves module
The blank of picture shows that the stage completes collection and the analog-to-digital conversion of electric current, and the effect of signals electric current for avoiding time schedule controller from exporting is adopted
The accuracy of collection, the accuracy of lifting power management chip excessively stream detecting, effectively protects the internal circuit of liquid crystal display panel, keeps away
Exempt from liquid crystal display panel excessively stream to burn, reduce enterprise's production loss.The present invention also provides a kind of overcurrent of liquid crystal display panel
Guard method, the accuracy of power management chip excessively stream detecting can be lifted, effectively protect the internal circuit of liquid crystal display panel,
Avoid liquid crystal display panel excessively stream from burning, reduce enterprise's production loss.
Brief description of the drawings
In order to be further understood that the feature of the present invention and technology contents, refer to below in connection with the detailed of the present invention
Illustrate and accompanying drawing, however accompanying drawing only provide with reference to and explanation use, be not used for being any limitation as the present invention.
In accompanying drawing,
Fig. 1 is the structural representation of the over-current protection system of the liquid crystal display panel of the present invention；
Fig. 2 is the flow chart of the overcurrent protection method of the liquid crystal display panel of the present invention；
Fig. 3 is the working timing figure of the over-current protection system of the liquid crystal display panel of the present invention.
Embodiment
Further to illustrate the technological means and its effect of the invention taken, below in conjunction with being preferable to carry out for the present invention
Example and its accompanying drawing are described in detail.
Referring to Fig. 1, the present invention provides a kind of over-current protection system of liquid crystal display panel, including：Time schedule controller
1 and with the time schedule controller 1 be electrically connected with power management chip 2；
The time schedule controller 1 includes：Current monitoring module 11 and with the current monitoring module 11 be electrically connected with
IC bus (Inter-Integrated Circuit, I2C) main frame (Master) module 12；The power management chip
2 include：Output module 21, I2C slaves (Salve) module 22 and analog-to-digital conversion being electrically connected with the output module 21
Module 23；The I2C host modules 12 are electrically connected with the I2C slaves module 22, the analog-to-digital conversion module 23 with it is described
I2C slaves module 22 and output module 21 are electrically connected with；
The I2C host modules 12, for sending the first instruction and the second instruction to the I2C slaves module 21；It is described
Output module 21, for liquid crystal display panel output driving current, the driving current to be analog signal；The I2C slaves
Module 22, for receiving the first instruction and the second instruction from I2C host modules 12 and being sent to analog-to-digital conversion module 23；The mould
Number modular converters 23, the driving current exported for the output module 21 according to the first instruction acquisition, and by the driving of collection
Electric current carries out analog-to-digital conversion, generates data signal, and instruct the data signal via the I2C slaves module according to second
22 are sent to current monitoring module 11 with I2C host modules 12；The current monitoring module 11, for according to the numeral received
Signal determine the driving current whether excessively stream, and in the driving current excessively stream via I2C host modules 12 and I2C slaves
Module 22 sends the instruction for starting overcurrent protection to the output module 21 of the power management chip 2.
It should be noted that referring to Fig. 3, in liquid crystal display during driving, to ensure the correct display of image,
One frame picture can be divided into effective display stage (Active) and blank shows stage (Blank), the data of liquid crystal display panel
Signal shows the stage then without the input of data-signal only in effectively display stage (Active) write-in sub-pixel in blank,
The control signals such as the clock signal that time schedule controller 1 exports are periodically variable pulse signal in the effectively display stage, if
Effective display stage starts the conversion of analog-to-digital conversion module 23 to gather driving current, tends to the letter such as collection subject clock signal by mistake
Number coupling and the current peak occurred, and show that the signals such as clock signal of stage time schedule controller 1 output are generally permanent in blank
It is high potential for low potential or perseverance, therefore shows that the driving current of phase acquisition will not go out compared to effective display stage in blank
The now current peak as caused by coupling signal, the data of acquisition are more accurate, in consideration of it, the present invention sets the analog-to-digital conversion mould
Block 23 gathers the driving current that the output module 21 exports, and the driving current of collection is carried out into analog-to-digital conversion, generation numeral
The process of signal is completed within the blank display stage of the frame picture of liquid crystal display panel one.
Specifically, in order to ensure that the analog-to-digital conversion module 23 gathers the driving current that the output module 21 exports, and
The driving current of collection is subjected to analog-to-digital conversion, generates sky of the process in the frame picture of liquid crystal display panel one of data signal
Completed in the white display stage, the present invention sets the I2C host modules 12 to send the first instruction to the I2C slaves module 22
Time is the very first time, and the I2C slaves module 22 has received the time of the first instruction and the modulus from I2C host modules 12
It was the second time that modular converter 23, which starts the collection of driving current and the time of analog-to-digital conversion, and the analog-to-digital conversion module 23 is complete
The time of collection and analog-to-digital conversion into driving current was the 3rd time, and the I2C host modules 12 are to the I2C slaves module
22 times for sending the second instruction were the 4th time.
Wherein, driving current can just be proceeded by because analog-to-digital conversion module 23 needs to receive complete first instruction
Collection and analog-to-digital conversion, and I2C slaves module 22 receives complete first instruction from I2C host modules 12 and is also required to the time, because
This can be in the blank of a frame picture in order to ensure that analog-to-digital conversion module 23 is driven the process of current acquisition and analog-to-digital conversion
Completed in the display stage, before the blank display stage of a frame picture is entered, I2C host modules 12 just need to start the first instruction
Transmission, with cause I2C slaves module 22 received first instruction time be located in the blank display stage of the frame picture,
So as to which the analog-to-digital conversion module 23 is driven current acquisition and analog-to-digital conversion starts and completed time is respectively positioned on same frame
The blank of picture shows that stage, namely the very first time are located at effective display rank of the frame picture of liquid crystal display panel one
Section, the blank that second time and the 3rd time are respectively positioned on the frame picture where the very first time show the stage.
Specifically, the 4th time is located at the effectively aobvious of the next frame picture of the frame picture where the very first time
Show the stage, it is preferable that the 4th time is located at the effectively aobvious of the next frame picture of the frame picture where the very first time
Show the initial time in stage, namely the instruction of transmission second is got started once the effective display stage for entering next frame picture.
It is noted that the time schedule controller 1 also includes：Clock signal output module 14, the clock signal are defeated
Go out module 14 to be used to export clock signal, the clock signal be used to control realize gate drivers to liquid crystal display panel by
Row scanning, while in order to control I2C host modules 12 to start to send the time of the first instruction, institute to the I2C slaves module 22
Stating time schedule controller 1 also includes：The clock signal being electrically connected with I2C host modules 12 and clock signal output module 14 counts
Module 13, the clock signal counting module 13 is used for the number of pulses for recording the clock signal of output, further, when described
Clock signal-count module 13 is by determining and recording the pulse of the clock signal according to the rising edge quantity of the clock signal
Quantity, the number of pulses that the I2C host modules 12 record according to the clock signal counting module 13 determine the very first time, institute
The very first time is stated as time of the number of pulses that the clock signal counting module 13 records equal to default destination number, that is, is worked as
The clock signal counting module 13 count to destination number pulse when, the I2C host modules 12 start to the I2C
Slave module 22 sends the first instruction.
Preferably, the stage is shown in the blank of a frame picture of the liquid crystal display panel, the clock signal exports mould
The clock signal that block 14 exports is in low potential all the time, to prevent from showing that the electric current as caused by coupling signal occurs in the stage in blank
Peak value.
Preferably, the over-current protection system is applied to the liquid crystal display panel that picture refreshing frequency is 50Hz or 60Hz
In, after excessively stream occurs in liquid crystal display panel, the time that can be remedied in picture refreshing frequency is often in more than 200ms
In 50Hz or 60Hz liquid crystal display panel, Over Current Protection System of the invention can detect the time more than 3 to 4 frames, have
Time enough carries out excessively stream detecting and judgement by Over Current Protection System.
Specifically, the output module 21 includes：Multiple output channels, the multiple output channel export different respectively
Driving current, further, the multiple output channel provide the differences such as VGH, VGL and Vcom to liquid crystal display panel respectively
Voltage signal, caused electricity in the output channel when driving current provides corresponding voltage signal for the output channel
Stream.
Further, the current monitoring module 11 is by the way that the data signal and default excessively stream threshold value are compared
Compared with, obtain a comparative result, and according to relatively cross judge the driving current whether excessively stream, wherein, when comparative result is described
Current monitoring module 11 judges driving current excessively stream, when comparing when the data signal is more than or equal to the excessively stream threshold value
As a result for the current monitoring module 11 when the data signal is less than the excessively stream threshold value, judge the driving current be just
Normal electric current.
Preferably, output module 21 receives overcurrent protection instruction and will stop exporting, and to carry out overcurrent protection, avoids
Liquid crystal display panel excessively stream is burnt.
Referring to Fig. 2, the present invention also provides a kind of overcurrent protection method of liquid crystal display panel, applied to above-mentioned liquid
The over-current protection system of LCD panel, comprises the following steps：
Step S1, for output module 21 to liquid crystal display panel output driving current, the driving current is analog signal；
Step S2, described I2C host modules 12 send the first instruction, the I2C slaves mould to the I2C slaves module 22
Block 22 receives the first instruction from I2C host modules 12 and is sent to analog-to-digital conversion module 23；Wherein, the I2C host modules 12
The time that the first instruction is sent to the I2C slaves module 22 is the very first time, and the I2C slaves module 22 is from I2C main frame moulds
The time that block 12 has received the first instruction was the second time；
Step S3, the driving electricity that described analog-to-digital conversion module 23 output module 21 according to the first instruction acquisition exports
Stream, and the driving current of collection is subjected to analog-to-digital conversion, generate data signal；Wherein, the analog-to-digital conversion module 23 starts to drive
The collection of streaming current and the time of analog-to-digital conversion were the second time, the analog-to-digital conversion module 23 complete driving current collection and
The time of analog-to-digital conversion was the 3rd time；
Step S4, described I2C host modules 12 send the second instruction, the I2C slaves mould to the I2C slaves module 22
Block 22 receives the second instruction from I2C host modules 12 and is sent to analog-to-digital conversion module 23；Wherein, the I2C host modules 12
The time that the second instruction is sent to the I2C slaves module 22 was the 4th time；
The data signal is sent to current monitoring module by step S5, described analog-to-digital conversion module 23 according to the second instruction
11；
Step S6, described current monitoring module 11 according to the data signal received determine the driving current whether mistake
Stream, and in the driving current excessively stream via I2C host modules 12 and I2C slaves module 22 to the power management chip 2
Output module 21 send start overcurrent protection instruction；
The very first time is located at effective display stage of the frame picture of liquid crystal display panel one, second time and
The blank that 3rd time was respectively positioned on the frame picture where the very first time shows the stage, and the 4th time is positioned at described the
Effective display stage of the next frame picture of a frame picture where one time.
In summary, the present invention provides a kind of over-current protection system of liquid crystal display panel, including：Time schedule controller,
And the power management chip being electrically connected with the time schedule controller；The time schedule controller includes：Current monitoring module, with
And the I2C host modules being electrically connected with current monitoring module；The power management chip includes：Output module, I2C slave moulds
Block and analog-to-digital conversion module；The I2C host modules are electrically connected with the I2C slaves module, the analog-to-digital conversion module
It is electrically connected with the I2C slaves module and output module；It can be matched somebody with somebody by the I2C host modules and the I2C slaves module
Close and control the analog-to-digital conversion module to show that the stage completes the collection of electric current in the blank of the frame picture of liquid crystal display panel one
And analog-to-digital conversion, the accuracy of the effect of signals current acquisition of time schedule controller output is avoided, lifts power management chip excessively stream
The accuracy of detecting, the internal circuit of liquid crystal display panel is effectively protected, avoids liquid crystal display panel excessively stream from burning, reduce enterprise
Production loss.The present invention also provides a kind of overcurrent protection method of liquid crystal display panel, can lift power management chip mistake
The accuracy of detecting is flowed, the internal circuit of liquid crystal display panel is effectively protected, avoids liquid crystal display panel excessively stream from burning, reduces enterprise
Industry production loss.
It is described above, for the person of ordinary skill of the art, can be with technique according to the invention scheme and technology
Other various corresponding changes and deformation are made in design, and all these changes and deformation should all belong to the claims in the present invention
Protection domain.
Claims (8)
- A kind of 1. over-current protection system of liquid crystal display panel, it is characterised in that including：Time schedule controller (1) and with institute State the power management chip (2) of time schedule controller (1) electric connection；The time schedule controller (1) includes：Current monitoring module (11) and with the current monitoring module (11) be electrically connected with I2C host modules (12)；The power management chip (2) includes：Output module (21) and the output module (21) are electrical The I2C slaves module (22) and analog-to-digital conversion module (23) of connection；The I2C host modules (12) and the I2C slaves mould Block (22) is electrically connected with, and the analog-to-digital conversion module (23) electrically connects with the I2C slaves module (22) and output module (21) Connect；The I2C host modules (12), for sending the first instruction and the second instruction to the I2C slaves module (22)；The I2C slaves module (22), for receiving the first instruction and the second instruction from I2C host modules (12) and being sent to mould Number modular converter (23)；The output module (21), for liquid crystal display panel output driving current, the driving current to be analog signal；The analog-to-digital conversion module (23), the driving current exported for the output module (21) according to the first instruction acquisition, And the driving current of collection is subjected to analog-to-digital conversion, data signal is generated, and the data signal is sent according to the second instruction Give current monitoring module (11)；The current monitoring module (11), for according to the data signal that receives determine the driving current whether excessively stream, and In the driving current excessively stream via I2C host modules (12) and I2C slaves module (22) to the power management chip (2) Output module (21) send start overcurrent protection instruction；Wherein, when the time that the I2C host modules (12) instruct to the I2C slaves module (22) transmission first is first Between, the I2C slaves module (22) has received the time of the first instruction and the analog-to-digital conversion module from I2C host modules (12) (23) it was the second time to start the collection of driving current and the time of analog-to-digital conversion, and the analog-to-digital conversion module (23) completes to drive The collection of streaming current and the time of analog-to-digital conversion were the 3rd time, and the I2C host modules (12) are to the I2C slaves module (22) time for sending the second instruction was the 4th time；The very first time is located at effective display stage of the frame picture of liquid crystal display panel one, second time and the 3rd The blank that time is respectively positioned on the frame picture where the very first time shows the stage, when the 4th time is located at described first Between where a frame picture next frame picture effective display stage.
- 2. the over-current protection system of liquid crystal display panel as claimed in claim 1, it is characterised in that the time schedule controller (1) also include：With I2C host modules (12) be electrically connected with clock signal counting module (13) and with clock signal count module The clock signal output module (14) that block (13) is electrically connected with；The clock signal output module (14) is used to export clock signal, and the clock signal counting module (13) is used to record The number of pulses of the clock signal of output；When the number of pulses that the I2C host modules (12) record according to the clock signal counting module (13) determines first Between, the very first time be the clock signal counting module (13) record number of pulses be equal to default destination number when Between.
- 3. the over-current protection system of liquid crystal display panel as claimed in claim 2, it is characterised in that in the liquid crystal display The blank of one frame picture of panel shows the stage, and the clock signal of clock signal output module (14) output is all the time in low Current potential.
- 4. the over-current protection system of liquid crystal display panel as claimed in claim 2, it is characterised in that the clock signal meter Digital-to-analogue block (13) determines the number of pulses of the clock signal of output according to the rising edge quantity of the clock signal.
- 5. the over-current protection system of liquid crystal display panel as claimed in claim 1, it is characterised in that the LCD The over-current protection system of plate is applied in the liquid crystal display panel that picture refreshing frequency is 50Hz or 60Hz.
- 6. the over-current protection system of liquid crystal display panel as claimed in claim 1, it is characterised in that the output module (21) include：Multiple output channels, the multiple output channel export different driving currents respectively.
- 7. the over-current protection system of liquid crystal display panel as claimed in claim 1, it is characterised in that the current monitoring mould Block (11) obtains a comparative result by the way that the data signal and default excessively stream threshold value are compared, and according to comparing Judge the driving current whether excessively stream.
- A kind of 8. overcurrent protection method of liquid crystal display panel, applied to the liquid crystal display described in any one of claim 1 to 7 The over-current protection system of panel, it is characterised in that comprise the following steps：Step S1, for output module (21) to liquid crystal display panel output driving current, the driving current is analog signal；Step S2, described I2C host modules (12) send the first instruction, the I2C slaves mould to the I2C slaves module (22) Block (22) receives the first instruction from I2C host modules (12) and is sent to analog-to-digital conversion module (23)；Wherein, the I2C main frames The time that module (12) sends the first instruction to the I2C slaves module (22) is the very first time, the I2C slaves module (22) The time that the first instruction has been received from I2C host modules (12) was the second time；Step S3, the driving electricity that described analog-to-digital conversion module (23) output module (21) according to the first instruction acquisition exports Stream, and the driving current of collection is subjected to analog-to-digital conversion, generate data signal；Wherein, the analog-to-digital conversion module (23) starts The collection of driving current and the time of analog-to-digital conversion were the second time, and the analog-to-digital conversion module (23) completes adopting for driving current The time of collection and analog-to-digital conversion was the 3rd time；Step S4, described I2C host modules (12) send the second instruction, the I2C slaves mould to the I2C slaves module (22) Block (22) receives the second instruction from I2C host modules (12) and is sent to analog-to-digital conversion module (23)；Wherein, the I2C main frames The time that module (12) sends the second instruction to the I2C slaves module (22) was the 4th time；The data signal is sent to current monitoring module by step S5, described analog-to-digital conversion module (23) according to the second instruction (11)；Step S6, the current monitoring module (11) according to the data signal received determine the driving current whether excessively stream, And in the driving current excessively stream via I2C host modules (12) and I2C slaves module (22) to the power management chip (2) output module (21) sends the instruction for starting overcurrent protection；The very first time is located at effective display stage of the frame picture of liquid crystal display panel one, second time and the 3rd The blank that time is respectively positioned on the frame picture where the very first time shows the stage, when the 4th time is located at described first Between where a frame picture next frame picture effective display stage.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710900683.XA CN107578754B (en) | 2017-09-28 | 2017-09-28 | Overcurrent protection system and overcurrent protection method of liquid crystal display panel |
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| CN110890052A (en) * | 2019-11-29 | 2020-03-17 | Tcl华星光电技术有限公司 | Driving circuit, driving method and display device |
| CN114333721A (en) * | 2021-12-16 | 2022-04-12 | 苏州华星光电技术有限公司 | Thin film transistor and display device |
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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. |