CN105741721B - A kind of power-on protection method and system for liquid crystal detection - Google Patents
A kind of power-on protection method and system for liquid crystal detection Download PDFInfo
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- CN105741721B CN105741721B CN201610289741.5A CN201610289741A CN105741721B CN 105741721 B CN105741721 B CN 105741721B CN 201610289741 A CN201610289741 A CN 201610289741A CN 105741721 B CN105741721 B CN 105741721B
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- liquid crystal
- voltage
- value
- current
- crystal display
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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
Abstract
The invention discloses a kind of power-on protection methods for liquid crystal detection to judge whether the voltage value on current liquid crystal screen is desired value this method comprises: powering on for liquid crystal display；If current voltage value is not desired value, powered-down pressure contact connector again；If current voltage value is identical as desired value, continue to power on.The present invention further discloses a kind of upper electric protection systems for liquid crystal detection.This programme has neglected the requirement in terms of structure precision aspect and personnel's proficiency, judge whether consumer product crimps well with the method that one kind electrically detects, ability powers on product in the good situation of crimping, is effectively prevented from the problem of product short circuit powers on.
Description
Technical field
The present invention relates to liquid crystal display detection techniques, more particularly to a kind of power-on protection method for liquid crystal detection and are
System.
Background technique
" light, thin, compact " is the development trend of handheld consumer class product in recent years.In order to realize this target, product makes
It is essential with the micromation of component, wherein just including the connector that liquid crystal display is connected with product mainboard.It connects
The micromation of plug-in unit brings new challenge in liquid crystal display detection, since the adjacent contact points of connector are apart from close,
When operator's gimmick is not pair or when contraposition mechanical structure little deviation occurs, the high voltage of backlight drive circuit is often gone here and there
Enter to going on neighbouring other input and output contacts, which is likely to be other supply voltages, ground wire or other number letters
Number.
Following two large divisions is broadly divided into for the power supply circuit of liquid crystal display:
1, the power supply circuit of liquid crystal display glass driving chip: the driving voltage feature of the circuit is low-voltage, power supply electricity
Pressure is generally 1.8V, 2.8V and 3.3V, and the size of driving current and the resolution ratio of liquid crystal display are related, generally tens mA.
2, the backlight drive power supply circuit of liquid crystal display: the driving voltage feature of the circuit is that voltage range is very wide, generally
It is set between 12V~36V.
For the contact short situation being likely to occur in liquid crystal display detection process, existing protection technique is according to patching
The classification difference of signal on part is mainly the following mode:
1, fast fuse wire is installed on all driving voltages, when there is short circuit current in outside, fuse is molten
It is disconnected to inhibit short circuit current.This method have the shortcomings that it is one very big, since liquid crystal checks that equipment needs extensive corresponding various specifications
Product, there is very big difference in the technical indicator of product.Such as certain product current value is 20mA, and another money current value is
1000mA.For this extensive adaptability, the short circuit current protection value of voltage can only be according to the maximum current protection value of equipment
To be configured.In this way when testing the liquid crystal product of low current, in the event of short circuit current, high current is had already appeared
Then fuse wire may have resulted in equipment and the damage of product of client.And equipment only waits after blown fuse
Again it can just work on after repairing, leverage the yield of client.
2, TVS (avalanche breakdown diode) is installed in all other input/output signal interfaces to realize to digital signal
Protection.The program have the shortcomings that one it is significant, TVS diode is generally only applicable to static discharge, transient high voltages to circuit
Protection.If the voltage of short circuit is the voltage of duration electric discharge, such as the backlight power supply voltage of equipment, then TVS pipe is because of nothing
Method, which bears continuous high current, will lead to damage, and high current continue period be equally possible to damage equipment interface circuit or
The product of client.
3, installation insurance silk and TVS protection diode are all a kind of passive protection technologies, when high voltage and high current are in electricity
It is produced in road, protects the other important of equipment and consumer product end so that blown fuse and TVS pipe breakdown damage are cost
Circuit.This method not only causes equipment to need repairing, and cannot avoid the damage of equipment and consumer product completely.
Accordingly, it is desirable to provide a kind of new power-on protection method, to overcome upper electric protection existing in the prior art not
The problem of foot.
Summary of the invention
The technical problem to be solved by the present invention is to the outer dimension due to consumer product is different, the connector used
Be it is varied, the operation gimmick of operator there is also difference, caused by plug connector crimp bad problem, and the problem
Plug connector short circuit, and cost mistake cannot be all fully solved only by the methods of structural member precision and the proficiency of personnel is improved
It is high.
In order to solve the above technical problems, the present invention adopts the following technical solutions:
A kind of power-on protection method for liquid crystal detection, this method comprises:
It is powered on for liquid crystal display, judges whether the voltage value on current liquid crystal screen is desired value；If current voltage value is not pre-
Time value, then powered-down pressure contact connector again；If current voltage value is identical as desired value, continue to power on.
Preferably, this method comprises: the judgement includes: the step of currently whether upper piezoelectric voltage is desired value
It powers for the driving chip of liquid crystal display；
Whether the voltage value for obtaining and judging liquid crystal display built-in storage is desired value, if the current value of memory is not expected
Value then judges that connector crimping is abnormal, powered-down pressure contact connector again；If current voltage value is correct, continue to power on.
Preferably, this method comprises: the judgement further comprises the step of currently whether upper piezoelectric voltage is desired value:
If driving chip power supply is correct, the power supply of liquid crystal display circuit board is continued as；
It obtains and judges whether the voltage value on liquid crystal display circuit board is desired value, if the current voltage value on circuit board is not
It is desired value, then judges that connector crimping is abnormal, powered-down pressure contact connector again；If current voltage value is correct, continue to power on.
Preferably, this method further comprises:
Gradually for the power supply of backlight drive current supply circuit up to the maximum of backlight drive current supply circuit is powered since no-voltage
Pressure, and whether the current value of backlight drive current supply circuit is zero under the current supply voltage of real-time judge；If the circuit is supplied currently
Current value under piezoelectric voltage is not zero, then judges that connector crimping is abnormal, powered-down pressure contact connector again；If the circuit is current
Current value under supply voltage is zero, then continues to power on.
Preferably, when powering for the backlight drive current supply circuit of liquid crystal display, backlight circuit is gradually supplied power to most from no-voltage
Big supply voltage.
Preferably, when powering for the backlight drive current supply circuit of liquid crystal display, gradually judge currently to power since no-voltage
Whether the current value of backlight drive current supply circuit is zero under voltage, until four points of the maximum voltage supplied of backlight drive current supply circuit
One of voltage value.
A kind of upper electric protection system for liquid crystal detection, the system include:
Driving chip detection unit carries out upper electro-detection for the driving chip to liquid crystal display, and judges that connector crimps
It is whether abnormal；
Circuit board detecting unit carries out the circuit board of liquid crystal display based on the judging result of driving chip detection unit
Electro-detection, and judge whether connector crimping is abnormal.
Preferably, the driving chip detection unit includes:
Driving chip power supply module is that the driving chip of liquid crystal display is powered；
First judgment module obtains and judges whether the voltage value of liquid crystal display built-in storage is desired value, if memory
Current value is not desired value, then judges that connector crimping is abnormal, powered-down pressure contact connector again；If current voltage value is correct,
Continue to power on.
Preferably, the driving chip detection unit includes:
Circuit board power supply module continues as the power supply of liquid crystal display circuit board if the power supply of driving chip is without exception；
Second judgment module obtains and judges whether the voltage value on liquid crystal display circuit board is desired value, if on circuit board
Current voltage value be not desired value, then judge that connector crimping is abnormal, powered-down pressure contact connector again；If current voltage value is just
Really, then continue to power on.
Preferably, backlight power supply loop power supply module is that the backlight drive current supply circuit of liquid crystal display is powered；
Third judgment module judges whether the current value of backlight drive current supply circuit under current power supply state is zero；If should
Current value of the circuit under current supply voltage is not zero, then judges that connector crimping is abnormal, powered-down pressure contact connector again；If
Current value of the circuit under current supply voltage is zero, then continues to power on.
Beneficial effects of the present invention are as follows:
Technical solution of the present invention is compared with existing technology, the application can:
1, it effectively avoids due to upper electrical anomaly and causes the damage of product, improve yields.
2, by not having each link to carry out upper electro-detection, the undesirable place of crimping can be found out earlier, avoids repeatability
Invalid operation.
3, the failure rate for reducing equipment improves the yield of client.
Detailed description of the invention
Specific embodiments of the present invention will be described in further detail with reference to the accompanying drawing；
Fig. 1 shows the schematic diagram of power-on protection method of the present invention.
Specific embodiment
In order to illustrate more clearly of the present invention, the present invention is done further below with reference to preferred embodiments and drawings
It is bright.Similar component is indicated in attached drawing with identical appended drawing reference.It will be appreciated by those skilled in the art that institute is specific below
The content of description is illustrative and be not restrictive, and should not be limited the scope of the invention with this.
The invention discloses a kind of power-on protection methods for liquid crystal detection to sentence this method comprises: powering on for liquid crystal display
Whether the voltage value on disconnected current liquid crystal screen is desired value；It is powered-down to patch again if current voltage value is not desired value
Part；If current voltage value is identical as desired value, continue to power on.Specifically, currently whether upper piezoelectric voltage is expected for the judgement
The step of value includes: to power for the driving chip of liquid crystal display, and read the current voltage value in the register in liquid crystal display；Judgement
Whether the voltage value of liquid crystal display built-in storage is desired value, if the current value of memory is not desired value, judges connector pressure
Connect exception, powered-down pressure contact connector again；If current voltage value is correct, continue to power on.When the driving chip for judging liquid crystal display
Detection can continue as the power supply of liquid crystal display circuit board without mistaking, and obtain the voltage value on current circuit board；Judge liquid crystal display circuit
Whether the voltage value on plate is desired value, if the current voltage value on circuit board is not desired value, judges that connector crimping is different
Often, powered-down pressure contact connector again；If current voltage value is correct, continue to power on.If the driving chip and circuit board of liquid crystal display
On voltage detect without mistaking, can power for the backlight drive current supply circuit of liquid crystal display, and judge under current power supply state
Whether the current value of backlight drive current supply circuit is zero；If current value of the circuit under current supply voltage is not zero, sentence
The crimping of disconnecting plug-in unit is abnormal, powered-down pressure contact connector again；If current value of the circuit under current supply voltage is zero, after
It is continuous to power on.Using a kind of gradual method for electro-detection in this programme, more accurate inspection is carried out to backlight drive current supply circuit
It surveys.In detection process, from no-voltage to backlight circuit maximum supply voltage, gradually power supply is that the backlight drive of liquid crystal display is powered back
Road power supply.At the same time, when powering for the backlight drive current supply circuit of liquid crystal display, gradually judge currently to power since no-voltage
Whether the current value of backlight drive current supply circuit is zero under voltage, until four points of the maximum voltage supplied of backlight drive current supply circuit
One of voltage value, may determine that connector contact is good if zero.For example, the maximum power supply of the backlight drive current supply circuit
Voltage is 24V, then, the range for carrying out loop current detection is from 0 to 6V, i.e., real-time detection judgement is current since no-voltage
Whether the current value of backlight drive current supply circuit is zero under supply voltage, until reach 6V, if it is normal to pressurize before 6V, 6V with
After can continue to pressurize, but the current value for carrying out backlight drive current supply circuit again is not needed, until being forced into backlight drive power supply
The maximum supply voltage in circuit.For example, the maximum supply voltage of the backlight drive current supply circuit is 12V, then, carry out circuit electricity
The range of stream detection is the backlight drive current supply circuit under the current supply voltage of real-time judge that is, since no-voltage from 0 to 3V
Whether current value is zero, until reaching 3V, if it is normal to pressurize before 3V, 3V can continue to pressurize later, but do not need again into
The current value of row backlight drive current supply circuit, until being forced into the maximum supply voltage of backlight drive current supply circuit.Using this
Electric detection method can be further improved the accuracy of upper electric protection detection on gradual backlight drive current supply circuit.Together
When, real-time detection judges maximum of the current value up to backlight drive current supply circuit of backlight drive current supply circuit since no-voltage
The a quarter of voltage value, this detection range can not only guarantee accuracy rate, can also save detection time and process,
It is further to improve detection efficiency.After above-mentioned detection is errorless, it can start to do product further performance detection.
The present invention further discloses a kind of upper electric protection systems for liquid crystal detection, which includes: for liquid
Crystalline substance screen driving chip carry out electro-detection, and judge connector crimping whether Yi Chang driving chip detection unit；Be based on
The judging result of driving chip detection unit carries out upper electro-detection to the circuit board of liquid crystal display, and whether judges connector crimping
Abnormal circuit plate detection unit.Wherein, the driving chip detection unit includes: the driving powered for the driving chip of liquid crystal display
Chip power supply module and first judgment module；The first judgment module is used to obtain and judge the voltage of liquid crystal display built-in storage
Whether value is desired value, if the current value of memory is not desired value, judges that connector crimping is abnormal, powered-down to connect again
Plug-in unit；If current voltage value is correct, continue to power on.The driving chip detection unit includes: for the power supply of liquid crystal display circuit board
Circuit board power supply module and the second judgment module；Second judgment module is for obtaining and judging on liquid crystal display circuit board
Whether voltage value is desired value, if the current voltage value on circuit board is not desired value, judges that connector crimping is abnormal, powered-down
Again pressure contact connector；If current voltage value is correct, continue to power on.The system further comprises the backlight drive for liquid crystal display
The backlight power supply loop power supply module and third judgment module of current supply circuit power supply；The third judgment module is current for judging
Whether the current value of backlight drive current supply circuit is zero under power supply state；If current value of the circuit under current supply voltage is not
It is zero, then judges that connector crimping is abnormal, powered-down pressure contact connector again；If current value of the circuit under current supply voltage
It is zero, then continues to power on.
Below by one group of embodiment, the present invention will be further described:
This programme is detached from the constraint of previous passive power-on protection method, proposes a kind of measure of electric protection in active.We
The problem of case due to product connector short circuit mainly for causing equipment interface circuit and consumer product to damage, carries out active
Power on monitoring for protection.And then the high voltage as caused by connector short circuit is prevented to be shorted to low voltage power supply circuit or inputted defeated
Signal circuit out.Such as the backlight power supply voltage of 24V has sealed in 3.3V power supply circuit or the high speed signal circuit of 1.2V etc..
Since the power supply output voltage of liquid crystal test equipment all has the adjustable range of wide scope, if the supply voltage of backlight~
It is adjustable under the range of 36V.Therefore, the backlight drive current supply circuit that this programme further provides a kind of pair of liquid crystal display carries out progressive
The method of electro-detection, can be effectively avoided and occur high voltage and high current in circuit suddenly in formula.
The core ideas of this programme is as follows:
1, the voltage powered to liquid crystal display driving chip is generally small voltage, and the voltage to liquid-crystalline glasses and backlight power supply is
High level, the voltage for generally burning out mould group is all high level.Therefore, it first powers to the driving chip of liquid crystal display, allows driving chip
It works together, whether correctly judges that data line contact is good by the data that data line reads driving chip internal register,
Determine whether liquid crystal display contact is good.
2, current Liquid crystal production producer is in order to distinguish the liquid crystal displays of same model different batches, in liquid crystal display circuit board
It is upper that an analog voltage is generated by electric resistance partial pressure, the mould group of different batches is distinguished according to different voltage values.The general electricity
Press all smaller (< 3.3V), therefore in test, by the analog voltage of detection liquid crystal display output whether in range come into one
Step judges whether current liquid crystal screen contacts well.
3, the high voltage of backlight power supply demand is tentatively up added from low to high, by detecting the electric current waited at low voltage
Whether abnormal determine whether mould group contacts well.For example, the backlight voltage of liquid crystal display needs 24V, then being in backlight voltage
4V, when contacting good, electric current 0；If contact short circuit, on string to other pins, certain electric current there will certainly be.
As shown in Figure 1, the specific power-on protection method of this programme is as follows:
The powering on of liquid crystal display, which is divided into driving chip and powers on, powers on two big processes with backlight drive:
The driving chip power supply of step S101, liquid crystal display is first carried out, completes powering on for liquid crystal display driving chip.
The current voltage value for executing step S102, reading liquid crystal display internal register, reads the current voltage value of register,
Then it is whether correct that step S103, reading value are executed? it is no to then follow the steps S109, connect if correctly continuing to execute step S104
Plug-in unit crimping is abnormal, powered-down to crimp again, terminates this and powers on.
If the driving chip of liquid crystal display is working properly, executes S104, reads the analog voltage on liquid crystal display circuit board, then
It is correct to execute step S105, voltage value? it is no to know execution step S109, connector crimping if correctly continuing to execute step S106
It is abnormal, it is powered-down to crimp again, terminate this and powers on.
If the driving chip and circuit board of liquid crystal display are working properly, execute S106, to backlight power supply circuit provide it is low
Then voltage reads the current value in backlight power supply circuit, correct by executing step S107, current value, to judge current flow
Whether value is abnormal.It is no to then follow the steps S109, connector crimping extremely if correctly executing step S108, it is powered-down to crimp again,
Terminate this to power on.What it is herein for liquid crystal display backlight drive current supply circuit for electro-detection is powered for the backlight drive of liquid crystal display
When loop power supply, gradually judge since no-voltage backlight drive current supply circuit under current supply voltage current value whether be
Zero, until the voltage value of a quarter of the maximum voltage supplied of backlight drive current supply circuit.
It executes step S108, offer high voltage in backlight power supply circuit is gradually provided, the whole for completing liquid crystal display powered on
Journey, client can start to detect product.
In conclusion this programme has neglected the requirement in terms of structure precision aspect and personnel's proficiency, with a kind of electrical
The method of detection judges whether consumer product crimps well, just powers on, is effectively prevented to product in the case where crimping good situation
The problem of product short circuit powers on.
Obviously, the above embodiment of the present invention be only to clearly illustrate example of the present invention, and not be pair
The restriction of embodiments of the present invention may be used also on the basis of the above description for those of ordinary skill in the art
To make other variations or changes in different ways, all embodiments can not be exhaustive here, it is all to belong to this hair
The obvious changes or variations that bright technical solution is extended out are still in the scope of protection of the present invention.
Claims (7)
1. a kind of power-on protection method for liquid crystal detection, which is characterized in that this method comprises:
It is powered on for liquid crystal display, judges whether the voltage value on current liquid crystal screen is desired value；If current voltage value is not desired value,
Then powered-down pressure contact connector again；If current voltage value is identical as desired value, continue to power on；
It further include since no-voltage gradually for the power supply of backlight drive current supply circuit up to the maximum of backlight drive current supply circuit supplies
Voltage；
This method further include:
When powering for the backlight drive current supply circuit of liquid crystal display, current supply voltage lower back CD-ROM drive is gradually judged since no-voltage
Whether the current value of dynamic current supply circuit is zero, until the voltage of a quarter of the maximum voltage supplied of backlight drive current supply circuit
Value；If current value of the circuit under current supply voltage is not zero, judge that connector crimping is abnormal, it is powered-down to connect again
Plug-in unit；If current value of the circuit under current supply voltage is zero, continue to power on.
2. power-on protection method according to claim 1, which is characterized in that this method comprises: the judgement currently powers on
The step of whether voltage is desired value include:
It powers for the driving chip of liquid crystal display；
Whether the voltage value for obtaining and judging liquid crystal display built-in storage is desired value, if the current value of memory is not desired value,
Then judge that connector crimping is abnormal, powered-down pressure contact connector again；If current voltage value is correct, continue to power on.
3. power-on protection method according to claim 2, which is characterized in that this method comprises: the judgement currently powers on
The step of whether voltage is desired value further comprises:
If driving chip power supply is correct, the power supply of liquid crystal display circuit board is continued as；
It obtains and judges whether the voltage value on liquid crystal display circuit board is desired value, if the current voltage value on circuit board is not pre-
Time value then judges that connector crimping is abnormal, powered-down pressure contact connector again；If current voltage value is correct, continue to power on.
4. power-on protection method according to claim 1 or 3, which is characterized in that power back for the backlight drive of liquid crystal display
When road powers, backlight circuit maximum supply voltage is gradually supplied power to from no-voltage.
5. a kind of upper electric protection system for liquid crystal detection, which is characterized in that the system includes:
Driving chip detection unit carries out upper electro-detection for the driving chip to liquid crystal display, and whether judges connector crimping
It is abnormal；
Circuit board detecting unit carries out upper electric-examination to the circuit board of liquid crystal display based on the judging result of driving chip detection unit
It surveys, and judges whether connector crimping is abnormal；
It further comprise backlight power supply loop power supply module and third judgment module, wherein
The backlight power supply loop power supply module is that the backlight drive current supply circuit of liquid crystal display is powered；
Third judgment module judges whether the current value of backlight drive current supply circuit under current power supply state is zero；If the circuit
Current value under current supply voltage is not zero, then judges that connector crimping is abnormal, powered-down pressure contact connector again；If this time
Current value of the road under current supply voltage is zero, then continues to power on.
6. upper electric protection system according to claim 5, which is characterized in that the driving chip detection unit includes:
Driving chip power supply module is that the driving chip of liquid crystal display is powered；
First judgment module obtains and judges whether the voltage value of liquid crystal display built-in storage is desired value, if memory is current
Value is not desired value, then judges that connector crimping is abnormal, powered-down pressure contact connector again；If current voltage value is correct, continue
It powers on.
7. upper electric protection system according to claim 6, which is characterized in that the driving chip detection unit includes:
Circuit board power supply module continues as the power supply of liquid crystal display circuit board if the power supply of driving chip is without exception；
Second judgment module obtains and judges whether the voltage value on liquid crystal display circuit board is desired value, if working as on circuit board
Preceding voltage value is not desired value, then judges that connector crimping is abnormal, powered-down pressure contact connector again；If current voltage value is correct,
Then continue to power on.
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| CN201610289741.5A CN105741721B (en) | 2016-05-05 | 2016-05-05 | A kind of power-on protection method and system for liquid crystal detection |
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| CN201610289741.5A CN105741721B (en) | 2016-05-05 | 2016-05-05 | A kind of power-on protection method and system for liquid crystal detection |
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| CN105741721B true CN105741721B (en) | 2019-04-12 |
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| CN109407356B (en) * | 2017-08-17 | 2021-12-03 | 上海帆声图像科技有限公司 | Power-on voltage-stabilizing power supply system and method for display screen |
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| CN104616614A (en) * | 2014-11-28 | 2015-05-13 | 合肥京东方光电科技有限公司 | Power-on method and device and detection method and device of display module |
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| CN1445888A (en) * | 2002-03-20 | 2003-10-01 | 建碁股份有限公司 | Circuit board with protection function and method for protecting circuit |
| CN101369399A (en) * | 2007-08-13 | 2009-02-18 | 普诚科技股份有限公司 | Circuit test device |
| CN101383129A (en) * | 2007-09-07 | 2009-03-11 | 北京京东方光电科技有限公司 | Power supply switch controlling method for LCD and device thereof |
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| US20130141322A1 (en) * | 2011-12-05 | 2013-06-06 | Apple Inc. | Efficient backlight short circuit protection |
| CN104616614A (en) * | 2014-11-28 | 2015-05-13 | 合肥京东方光电科技有限公司 | Power-on method and device and detection method and device of display module |
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| CN105741721A (en) | 2016-07-06 |
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Address after: 215000 Qingqiu Lane 8, Suzhou Industrial Park, Suzhou City, Jiangsu Province Applicant after: Suzhou Huaxing source Polytron Technologies Inc Address before: 215123 East Fang Industrial Park, No. 1 Huayun Road, Suzhou Industrial Park, Jiangsu Province, 2nd Floor Applicant before: Suzhou HYC Electronic Technology Co., Ltd. |
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