CN108010497A - A kind of liquid crystal display and its over-current protection method - Google Patents
A kind of liquid crystal display and its over-current protection method Download PDFInfo
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- CN108010497A CN108010497A CN201711201415.5A CN201711201415A CN108010497A CN 108010497 A CN108010497 A CN 108010497A CN 201711201415 A CN201711201415 A CN 201711201415A CN 108010497 A CN108010497 A CN 108010497A
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/165—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values
- G01R19/16566—Circuits and arrangements for comparing voltage or current with one or several thresholds and for indicating the result not covered by subgroups G01R19/16504, G01R19/16528, G01R19/16533
- G01R19/16571—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 AC or DC current with one threshold, e.g. load current, over-current, surge current or fault current
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H1/00—Details of emergency protective circuit arrangements
- H02H1/0007—Details of emergency protective circuit arrangements concerning the detecting means
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/02—Details
- H02H3/05—Details with means for increasing reliability, e.g. redundancy arrangements
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/08—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess current
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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
- G09G2330/00—Aspects of power supply; Aspects of display protection and defect management
- G09G2330/04—Display protection
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Power Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Computer Hardware Design (AREA)
- Theoretical Computer Science (AREA)
- Control Of Indicators Other Than Cathode Ray Tubes (AREA)
Abstract
The invention discloses a kind of liquid crystal display, including the first integrated circuit and at least one second integrated circuit, the first integrated circuit and the second integrated circuit to be connected to same data/address bus；First integrated circuit includes current value read module, average current value computing module, overcurrent judgment module and overcurrent protection module.The present invention also provides a kind of over-current protection method of liquid crystal display; the liquid crystal display and its over-current protection method of the present invention; the size of current of each integrated circuit can effectively be detected; the noise that each integrated circuit produces at work and the interference that spiny circuit waveform is brought are avoided, improves the accuracy of detecting.
Description
Technical field
The present invention relates to the fields such as circuit over-current protection, are specially a kind of liquid crystal display and its over-current protection method.
Background technology
The overcurrent protection of TFT-LCD is a function of having to possess at present, and overcurrent protection is face in order to prevent
Short circuit in plate, the short circuit in panel can cause molten screen even on fire.Present overcurrent detecting is usually pair
The size of the detecting of real time status electric current, actually this electric current is instantaneous current status, should due to the change of loading condition
The waveform of electric current has very big spine (such as level shifting circuit (Level Shifter) in array base palte (GOA) circuit
CK electric currents), whether the temporal pattern so detected can not reflect load beyond restriction in real time, if can cause face
Molten screen in plate etc..Therefore need to redesign a current foldback circuit and its control mode to detect each circuit in panel
Current situation.
The content of the invention
It is an object of the present invention to provide a kind of liquid crystal display and its over-current protection method, is detectd with solving existing overcurrent
The technical problem that current sense deviation is larger present in survey method, overcurrent protection is ineffective.
In order to solve the above technical problems, the present invention provides a kind of liquid crystal display, including the first integrated circuit and at least one
A second integrated circuit, first integrated circuit and second integrated circuit are connected to same data/address bus；It is wherein described
First integrated circuit includes：
Current value read module, it is defeated at an at least time point to read the second integrated circuit by the data/address bus
Go out current transient value；
Average current value computing module, to the output current transient state according to two or more time point in a preset time period
Value, calculates average current value of the output terminal of second integrated circuit in the preset time period；
Overcurrent judgment module, for judging whether the average current value is greater than or equal to a predetermined threshold value；And
Overcurrent protection module, the average current value for the output terminal when second integrated circuit are more than predetermined threshold value
When, to be powered off by the data/address bus second integrated circuit.
In a preferred embodiment of the invention, second integrated circuit includes：
Current value acquisition module, to gather current transient of the output terminal of second integrated circuit at a time point
Value.
In a preferred embodiment of the invention, the current value acquisition module includes：
Current sense unit, to the second integrated circuit described in detecting real-time output terminal an at least time point inductance
Current signal；
Current conversion unit, the inductor current signal to be converted to the current transient value of number format；And
Current value storage unit, to store the current transient value of the number format.
In a preferred embodiment of the invention, the current sense unit is mirror current source, and the electric current conversion is single
Member is AD conversion unit；
The mirror current source be used for by the output terminal of second integrated circuit a time point transient state output current
Mirror image forms inductor current signal to second IC interior；
The AD conversion unit is used for the current transient value that the inductor current signal is converted to number format.
In a preferred embodiment of the present invention, the data/address bus is I2C buses；First integrated circuit is sequential control
Circuit processed；Second integrated circuit includes pulse width modulation circuit, programmable gamma buffer circuit or level shifting circuit.
In order to solve the above technical problems, the present invention also provides a kind of over-current protection method of liquid crystal display, the liquid crystal
Display includes the first integrated circuit and at least one second integrated circuit, and first integrated circuit and the second integrated circuit connect
It is connected to same data/address bus；Wherein described over-current protection method includes the following steps；
The current value read module of first integrated circuit reads the second integrated circuit extremely by the data/address bus
The output current instantaneous value at a few time point；
The average current value computing module of first integrated circuit is according to two or more time point in a preset time period
Output current instantaneous value, calculate average current value of the output terminal of second integrated circuit in the preset time period；
The overcurrent judgment module of first integrated circuit is used to judge whether the average current value is greater than or equal to one
Predetermined threshold value；And
Average current value of the overcurrent protection module of first integrated circuit in the output terminal of second integrated circuit
During more than predetermined threshold value, to be powered off by the data/address bus second integrated circuit.
It is described that second integrated circuit is read at least for the moment by the data/address bus in a preferred embodiment of the present invention
Between put output current instantaneous value the step of, the over-current protection method further includes：
The current value acquisition module of second integrated circuit is gathering the output terminal of second integrated circuit one
The current transient value at time point.
In a preferred embodiment of the present invention, the current value acquisition module of second integrated circuit is gathering described
The output terminal of two integrated circuits includes in the step of current transient value at a time point：
The current sense unit of the current value acquisition module to the second integrated circuit described in detecting real-time output terminal
In the inductor current signal at an at least time point；
The current conversion unit of the current value acquisition module by the inductor current signal being converted to number format
Current transient value；And
The current value storage unit of the current value acquisition module is storing the current transient value of the number format.
In a preferred embodiment of the present invention, the current sense unit is mirror current source, the current conversion unit
For AD conversion unit；
The mirror current source be used for by the output terminal of second integrated circuit a time point transient state output current
Mirror image forms inductor current signal to second IC interior；
The AD conversion unit is used for the current transient value that the inductor current signal is converted to number format.
In a preferred embodiment of the present invention, the data/address bus is I2C buses；First integrated circuit is sequential control
Circuit processed；Second integrated circuit includes pulse width modulation circuit, programmable gamma buffer circuit or level shifting circuit.
It is an advantage of the invention that：A kind of liquid crystal display and its over-current protection method of the present invention, can effectively detect
The size of current of each integrated circuit, avoids noise and spiny circuit waveform band that each integrated circuit produces at work
The interference come, improves the accuracy of detecting, effectively prevent triggered because of current sense mistake protection circuit bring it is negative
Face is rung.
Brief description of the drawings
The present invention is further explained with reference to the accompanying drawings and examples.
Fig. 1 be the embodiment of the present invention liquid crystal display in integrated circuit cell schematics.
Fig. 2 is the structure diagram of the current value collecting unit of the embodiment of the present invention.
Fig. 3 is the physical circuit schematic diagram of the current value collecting unit of the embodiment of the present invention.
Fig. 4 is the flow chart of the over-current protection method of the liquid crystal display of the embodiment of the present invention.
Fig. 5 is the flow chart of the current value acquisition step of the over-current protection method of the liquid crystal display of the embodiment of the present invention.
Wherein,
1st, sequential control circuit；2nd, level shifting circuit；
3rd, it may be programmed gamma buffer circuit；4th, level shifting circuit；
12nd, current value read module；13rd, average current value computing module；
14th, overcurrent judgment module；15th, over-current protecting unit；
21st, 31,41, current value acquisition module；
51st, current sense unit；52nd, current conversion unit；
53rd, current value storage unit；61st, mirror current source；
62nd, AD conversion unit；63rd, memory.
Embodiment
The explanation of following embodiments is with reference to additional schema, to illustrate the particular implementation that the present invention can be used to implementation
Example.
Embodiment 1
As shown in Figure 1, a kind of liquid crystal display, the liquid crystal display includes the first integrated circuit and at least one second
Integrated circuit, the first integrated circuit and the second integrated circuit are connected to same data/address bus.Such as I2C buses.
In the present embodiment, the first integrated circuit can be sequential control circuit 1, and the second integrated circuit can be pulse width modulation
Circuit 2, programmable gamma buffer circuit 3, level shifting circuit 4.
In the present embodiment, the second integrated circuit further include switched capacitor voltage conversion circuit (Charge Pump) and
Operational amplification circuit (OP), low-dropout linear voltage-regulating circuit (LDO) etc., the overcurrent test method of these circuits turn similar to level
Change circuit 4 (Level Shifter).Explained below by taking level shifting circuit 4 as an example.
First integrated circuit includes current value read module 12, average current value computing module 13, overcurrent judgment module 14
And overcurrent protection module 15.
Current value read module 12 to by data/address bus read the second integrated circuit an at least time point output
Current transient value.
Average current value computing module 13 is to the output current wink according to two or more time point in a preset time period
State value, calculates average current value of the output terminal of the second integrated circuit in the preset time period.
Overcurrent judgment module 14 is used to judge whether average current value is greater than or equal to a predetermined threshold value.If average current value
More than or equal to predetermined threshold value, judge that the output end current of second integrated circuit is excessive；If average current value is less than default threshold
Value, judges that the output end current of the second integrated circuit is normal；When the output end current of the second integrated circuit is excessive, overcurrent protection
Unit 15 powers off to second integrated circuit by data/address bus.
Wherein, as shown in Fig. 2, the second integrated circuit includes current value acquisition module 21,31,41.Current value collecting unit
Including current sense unit 51, current conversion unit 52 and current value storage unit 53.Current sense unit 51 is to real-time
Detect inductor current signal of the output terminal at an at least time point of the second integrated circuit；Current conversion unit 52 is to by inductance
Current signal is converted to the current transient value of number format；Current value storage unit 53 is storing the current transient of number format
Value.
Specifically, as shown in figure 3, current sense unit 51 is mirror current source 61, current conversion unit 52 turns for modulus
Change unit 62.Mirror current source 61 be used for by the output terminal of the second integrated circuit a time point transient state output current mirror image extremely
Second IC interior, forms inductor current signal.AD conversion unit 62 is used to inductor current signal being converted to numeral
The current transient value of form.Current value storage unit 53 is the memory 63 being connected with AD conversion unit 62, for storing number
The current transient value of word format.
As shown in Figure 2,3, mirror current source 61 is connected by PMOS tube with the output CLKOUT of level shifting circuit 4,
The input terminal of PMOS tube is connected with the output of level shifting circuit 4, and mirror current source 61 passes through high level signal VGH and PMOS tube
Output terminal connection, while mirror current source 61 is connected with the control terminal of PMOS tube.So mirror current source 61 can turn level
The transient state output current mirror image of the output of circuit 4 is changed to the second IC interior, forms inductor current signal.Subsequent analog-to-digital conversion
The inductor current signal (or corresponding voltage signal) is carried out analog-to-digital conversion by unit 62, forms the current transient of number format
Value, is such as stored with 8bit.The current transient value that last memory 63 generates AD conversion unit 62 carries out storage operation.
When obtaining current values according to after the conversion of AD conversion unit 62, and calculate the electric current in preset time period and be averaged
When value has exceeded predetermined threshold value, then prove the second Integrated circuit portion fever corresponding on liquid crystal display beyond police
Scope is guarded against, it is necessary to protect as early as possible, prevents from burning out.If current average is less than given threshold, it was demonstrated that fever is still below given threshold,
The risk not burnt out, can work on.
The present invention also provides a kind of over-current protection method of liquid crystal display, as shown in figure 4, the over-current protection method includes
Step S10- steps S13.
Step S10, current value acquisition step, the current value acquisition module of the second integrated circuit are integrated electric to gather second
Current transient value of the output terminal on road at a time point.As shown in figure 5, step S10 includes：
Step S101, current mirror step, the current sense unit of current value acquisition module collect to detecting real-time second
Into circuit output terminal an at least time point inductor current signal；
Step S102, analog-to-digital conversion step, the current conversion unit of current value acquisition module is to by inductor current signal
Be converted to the current transient value of number format；
Step S103, current value storing step, the current value storage unit of current value acquisition module is storing digital lattice
The current transient value of formula, is stored with 8bit data modes in the present embodiment.
Step S11, current value read step, the current value read module of the first integrated circuit read the by data/address bus
Output current instantaneous value of two integrated circuits at an at least time point.
Step S12, average current value calculation procedure, the average current value computing module of the first integrated circuit are default according to one
The output current instantaneous value at two or more time point in period, calculates the output terminal of the second integrated circuit in the preset time period
Interior average current value.
Step S13, overcurrent judgment step, the overcurrent judgment module of the first integrated circuit contrast the average current value and one
Predetermined threshold value, if the average current value is greater than or equal to predetermined threshold value, judges the output end current mistake of second integrated circuit
Greatly；If the average current value is less than predetermined threshold value, judge that the output end current of second integrated circuit is normal.
Step S14) overcurrent protection step, the output of the overcurrent protection module of the first integrated circuit in second integrated circuit
When holding electric current excessive, powered off to second integrated circuit by the data/address bus.
The liquid crystal display and its over-current protection method of the present invention, the electric current that can effectively detect each integrated circuit are big
It is small, and the interference that the noise that can be produced at work to avoid each integrated circuit and spiny circuit waveform are brought, carry
The high accuracy of detecting, effectively prevents and the negative effect that protection circuit is brought is triggered because of current sense mistake.Due to
Switching power circuit in pulse width modulation circuit 3 (PWM IC) generally all does over current protection using detecting inductive current
Shield, therefore, detection electric current can be with simple designs.
The foregoing is merely a prefered embodiment of the invention, is not intended to limit the invention, it is all the present invention spirit and
All any modification, equivalent and improvement made within principle etc., should all be included in the protection scope of the present invention.
Claims (10)
1. a kind of liquid crystal display, including the first integrated circuit and at least one second integrated circuit, first integrated circuit
Same data/address bus is connected to second integrated circuit；It is characterized in that, first integrated circuit includes：
Current value read module, to read output electricity of second integrated circuit at an at least time point by the data/address bus
Flow instantaneous value；
Average current value computing module, to the output current instantaneous value according to two or more time point in a preset time period,
Calculate average current value of the output terminal of second integrated circuit in the preset time period；
Overcurrent judgment module, for judging whether the average current value is greater than or equal to a predetermined threshold value；And
Overcurrent protection module, when the average current value for the output terminal when second integrated circuit is more than predetermined threshold value, is used
To be powered off by the data/address bus second integrated circuit.
2. liquid crystal display according to claim 1, it is characterised in that second integrated circuit includes：
Current value acquisition module, to gather current transient value of the output terminal of second integrated circuit at a time point.
3. liquid crystal display according to claim 2, it is characterised in that the current value acquisition module includes：
Current sense unit, to the second integrated circuit described in detecting real-time output terminal an at least time point inductive current
Signal；
Current conversion unit, the inductor current signal to be converted to the current transient value of number format；And
Current value storage unit, to store the current transient value of the number format.
4. liquid crystal display according to claim 2, it is characterised in that the current sense unit is mirror current source,
The current conversion unit is AD conversion unit；
The mirror current source be used for by the output terminal of second integrated circuit a time point transient state output current mirror image
To second IC interior, inductor current signal is formed；
The AD conversion unit is used for the current transient value that the inductor current signal is converted to number format.
5. according to any liquid crystal display in Claims 1-4, it is characterised in that the data/address bus is total for I2C
Line；First integrated circuit is sequential control circuit；Second integrated circuit includes pulse width modulation circuit, may be programmed
Gamma buffer circuit or level shifting circuit.
6. a kind of over-current protection method of liquid crystal display, the liquid crystal display includes the first integrated circuit and at least one the
Two integrated circuits, first integrated circuit and the second integrated circuit are connected to same data/address bus；It is characterized in that, the mistake
Stream guard method includes the following steps；
The current value read module of first integrated circuit reads the second integrated circuit at least one by the data/address bus
The output current instantaneous value at time point；
The average current value computing module of first integrated circuit according in a preset time period two or more time point it is defeated
Go out current transient value, calculate average current value of the output terminal of second integrated circuit in the preset time period；
The overcurrent judgment module of first integrated circuit is used to judge whether the average current value is greater than or equal to one and presets
Threshold value；And
The overcurrent protection module of first integrated circuit is more than in the average current value of the output terminal of second integrated circuit
During predetermined threshold value, to be powered off by the data/address bus second integrated circuit.
7. the over-current protection method of liquid crystal display according to claim 6, it is characterised in that described to pass through the data
Bus reads the second integrated circuit the output current instantaneous value at an at least time point the step of, and the over-current protection method also wraps
Include：
The current value acquisition module of second integrated circuit is gathering the output terminal of second integrated circuit in the time
The current transient value of point.
8. the over-current protection method of liquid crystal display according to claim 7, it is characterised in that second integrated circuit
Current value acquisition module gathering the output terminal of second integrated circuit the current transient value at a time point the step of
Including：
The current sense unit of the current value acquisition module to the second integrated circuit described in detecting real-time output terminal extremely
The inductor current signal at a few time point；
The inductor current signal being converted to the electricity of number format by the current conversion unit of the current value acquisition module
Flow instantaneous value；And
The current value storage unit of the current value acquisition module is storing the current transient value of the number format.
9. the over-current protection method of liquid crystal display according to claim 7, it is characterised in that the current sense unit
For mirror current source, the current conversion unit is AD conversion unit；
The mirror current source be used for by the output terminal of second integrated circuit a time point transient state output current mirror image
To second IC interior, inductor current signal is formed；
The AD conversion unit is used for the current transient value that the inductor current signal is converted to number format.
10. according to the over-current protection method of any liquid crystal display in claim 6 to 9, it is characterised in that the number
It is I2C buses according to bus；First integrated circuit is sequential control circuit；Second integrated circuit includes pulse width tune
Circuit, programmable gamma buffer circuit or level shifting circuit processed.
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| CN201711201415.5A CN108010497A (en) | 2017-11-27 | 2017-11-27 | A kind of liquid crystal display and its over-current protection method |
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| CN201711201415.5A CN108010497A (en) | 2017-11-27 | 2017-11-27 | A kind of liquid crystal display and its over-current protection method |
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| CN109346019A (en) * | 2018-11-22 | 2019-02-15 | 深圳市华星光电技术有限公司 | Overcurrent protection control circuit for level shift circuit |
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| CN109801580A (en) * | 2018-12-24 | 2019-05-24 | 惠科股份有限公司 | Display panel and its overcurrent protection method and computer readable storage medium |
| WO2020118764A1 (en) * | 2018-12-12 | 2020-06-18 | 惠科股份有限公司 | Overcurrent protection method, display panel and display device |
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| WO2020118764A1 (en) * | 2018-12-12 | 2020-06-18 | 惠科股份有限公司 | Overcurrent protection method, display panel and display device |
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| CN109584829A (en) * | 2018-12-25 | 2019-04-05 | 惠科股份有限公司 | Over-current protection method, display panel and overcurrent protective device |
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| CN109637412B (en) * | 2018-12-25 | 2020-10-30 | 惠科股份有限公司 | Overcurrent protection method of display panel and display device |
| US11514869B2 (en) | 2018-12-25 | 2022-11-29 | HKC Corporation Limited | Over-current protection method for display panel and display device |
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| US11646565B2 (en) | 2018-12-27 | 2023-05-09 | HKC Corporation Limited | Overcurrent protection method, overcurrent protection circuit, and display device |
| WO2020206802A1 (en) * | 2019-04-11 | 2020-10-15 | 深圳市华星光电技术有限公司 | Operational amplifier and display device |
| CN111326092A (en) * | 2020-03-19 | 2020-06-23 | 深圳市华星光电半导体显示技术有限公司 | Source electrode driving chip abnormity detection circuit and abnormity detection method thereof |
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Application publication date: 20180508 |