CN107342033A - A kind of method and apparatus of display picture detection - Google Patents
A kind of method and apparatus of display picture detection Download PDFInfo
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- CN107342033A CN107342033A CN201710729328.0A CN201710729328A CN107342033A CN 107342033 A CN107342033 A CN 107342033A CN 201710729328 A CN201710729328 A CN 201710729328A CN 107342033 A CN107342033 A CN 107342033A
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- voltage
- pressure difference
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- display
- fault type
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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
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- Engineering & Computer Science (AREA)
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- Computer Hardware Design (AREA)
- General Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Control Of Indicators Other Than Cathode Ray Tubes (AREA)
Abstract
The present invention relates to display technology field, more particularly to a kind of method and apparatus of display picture detection.For solving to go wrong for display picture, do not solve method well at present.The embodiment of the present invention is by measuring the voltage of display voltage input end and circuit board voltage output end voltage, draw the pressure difference between detection resistance both ends, the pressure difference of gained is recycled compared with normal voltage range, if pressure difference is not in normal voltage range, further fault type corresponding to the abnormal voltage scope according to belonging to the corresponding relation of abnormal voltage scope and fault type determines the pressure difference.The reason for can detecting whether display picture goes wrong in real time, and going wrong, so as to determine the problem of display breaks down place in time so that display is timely safeguarded.
Description
Technical field
The present invention relates to display technology field, more particularly to a kind of method and apparatus of display picture detection.
Background technology
LCD (liquid crystal display) is a kind of display device of thin plane.Because the characteristics of its power consumption is low, enjoys engineer
Favor.
On the premise of being easy to carry and carrying, the neck such as lcd technology is shown at right angle, compact and zero radiation
The advantages of domain, can make user enjoy optimal visual effect.Different from CRT (cathode-ray tube display) technology, liquid crystal
Show that device picture will not flash, it is possible to reduce injury of the display to eyes, eyes are not easily tied.Classify according to type of drive
Three kinds of static drive, simple matrix driving and active matrix drive can be divided into.
The application of liquid crystal display is also very extensive, from civilian video telephone to military radar etc..It is common for example
The display screen of portable computer is exactly a kind of liquid crystal display.
With the development of science and technology, the application of LCDs is also more and more extensive.Such as telecommunications, network computer room main frame
Display；Train, subway station, the monitoring display device at harbour；Vehicle-mounted (train, subway, automobile) display；Advertisement machine is (in life
The advertisement machines such as residential elevator, public place, commercial office building of living play commercial advertisement).Under normal circumstances, the position of these applications
It is unfixed.On the other hand, with the distant of manufacturer, and it is not easy installing/dismounting.These reasons all cause liquid crystal
Screen has no idea to obtain manual maintenance in time.
A kind of feasible method is at present：Come the state that works on power of detection LCD monitor by way of being wirelessly transferred
It is whether normal：Picture speciality now is recorded when upper electric first, backstage is transferred to by installing camera, it is artificial by backstage
Come judge display whether normal work.But such a method when can only detect electric display whether normal work, and do not have
There is method to assess the concrete reason to go wrong.
In summary, the detection means to be gone wrong for display picture, do not solve method well at present.
The content of the invention
The present invention provides a kind of method and apparatus of display detection, to solve what is gone wrong for display picture
Detection means, do not solve the problems, such as method well at present.
The embodiment of the present invention provides a kind of method of display detection, and this method includes：
The pressure difference of the voltage at detection resistance both ends is determined, wherein described detection resistance one end connects with display voltage input end
Connect, the other end is connected with circuit board voltage output end；
If it is determined that the pressure difference not in normal voltage range, corresponding according to abnormal voltage scope and fault type is closed
Fault type corresponding to abnormal voltage scope belonging to system's determination pressure difference.
Alternatively, fault type includes short circuit and open circuit：
Corresponding to abnormal voltage scope according to belonging to the corresponding relation of abnormal voltage scope and fault type determines pressure difference
Fault type, including：
If it is determined that the pressure difference be more than normal voltage range maximum, it is determined that fault type for short circuit；Or
If it is determined that the pressure difference be less than normal voltage range maximum, it is determined that fault type for open circuit.
Alternatively, the acquisition time of acquisition testing resistance both end voltage is determined according to frame scan initial signal STV signals
's.
Alternatively, this method also includes：
The voltage at one-time detection resistance both ends is often gathered, by counter plus a step value, and after all rows all scan through,
Empty the counter；
After the determination detection resistance both end voltage pressure difference, in addition to：
If it is determined that the pressure difference not in normal range (NR), according to the numerical value of nonce counter, determine that the display goes out
Existing location of fault.
The embodiment of the present invention provides a kind of equipment of display detection, and the equipment includes：
Voltage collector, comparator and detection resistance；Wherein described detection resistance one end connects with display voltage input end
Connect, the other end is connected with circuit board voltage output end；
Voltage collector, the voltage for acquisition testing resistance both ends；
Comparator, for determine collection voltage pressure difference, however, it is determined that the pressure difference not in normal voltage range, root
Failure classes corresponding to abnormal voltage scope belonging to the pressure difference are determined according to the corresponding relation of abnormal voltage scope and fault type
Type.
Alternatively, described fault type includes short circuit and open circuit：
The comparator is specifically used for：
If it is determined that the pressure difference be more than normal voltage range maximum, it is determined that fault type for short circuit；Or
If it is determined that the pressure difference be less than normal voltage range maximum, it is determined that fault type for open circuit.
Alternatively, the comparator is additionally operable to：
After the voltage that the voltage collector often gathers one-time detection resistance both ends, one-time detection resistance both ends electricity is determined
The pressure difference of pressure.
Alternatively, the acquisition time of the acquisition testing resistance both end voltage is determined according to clock signal.
Alternatively, the equipment also includes：Counter；
The counter is used for：
After the voltage that the voltage acquisition module often gathers one-time detection resistance both ends, by counter plus a step value,
And after all rows all scan through, empty the counter；
The comparator is additionally operable to：
It is determined that after detection resistance both end voltage pressure difference, however, it is determined that the pressure difference not in normal range (NR), according to work as
The numerical value of preceding counter, determine the position that the display breaks down.
The embodiment of the present invention is drawn by measuring the voltage of display voltage input end and circuit board voltage output end voltage
Pressure difference between detection resistance both ends, the pressure difference of gained is recycled compared with normal voltage range, if pressure difference is not just
It is in normal voltage range, then further different according to belonging to the corresponding relation of abnormal voltage scope and fault type determines the pressure difference
Fault type corresponding to normal voltage range.Because the embodiment of the present invention can be according to abnormal voltage scope and the correspondence of fault type
Relation determine abnormal voltage scope belonging to the pressure difference corresponding to fault type, whether can detect display picture in real time
The reason for going wrong, and going wrong, so as to determine the problem of display breaks down place in time so that display
Device is timely safeguarded.
Brief description of the drawings
Technical scheme in order to illustrate the embodiments of the present invention more clearly, make required in being described below to embodiment
Accompanying drawing is briefly introduced, it should be apparent that, drawings in the following description are only some embodiments of the present invention, for this
For the those of ordinary skill in field, without having to pay creative labor, it can also be obtained according to these accompanying drawings
His accompanying drawing.
The pressure difference schematic diagram of Fig. 1 embodiment of the present invention voltage at source electrode latch signal (TP) acquisition testing resistance both ends；
Fig. 2 is the pressure difference schematic diagram of the voltage at frame start signal of the embodiment of the present invention (STV) acquisition testing resistance both ends；
Fig. 3 is the connection relationship diagram of detection resistance of the embodiment of the present invention；
Fig. 4 is the schematic flow sheet that the embodiment of the present invention carries out display detection method；
Fig. 5 is that the embodiment of the present invention carries out the schematic flow sheet that display detects complete method；
Fig. 6 is the device structure schematic diagram that the embodiment of the present invention carries out display detection.
Embodiment
Display is as shown in Figure 1 in the case of normal work：
Under normal circumstances, when clock signal is in low level (now by taking source electrode latch signal TP as an example), grid power supply
Voltage can be pulled low.
Working condition of the display in open circuit is as shown in Figure 2.As can be seen from the figure：In clock signal (now with frame
Exemplified by clock signal STV) there are a series of grid supply voltages not to be supported before rising edge to drag down, this series of signal is exactly grid
When extremely breaking, the waveform of grid supply voltage.
Similarly, when display is in short-circuit, grid supply voltage can also be supported and drag down.Now grid supply voltage can be with
Short circuit voltage is identical.
Here still by taking Fig. 2 as an example：If grid is shorted to ground, recessed area will be changed into 0V in figure；If grid is short
It is connected to bV signal, then recessed area will become bV.
Have that is, if display is in short circuit or open circuit, recessed area with recessed area during normal work
Difference.
Based on above-mentioned principle, the embodiment of the present invention increases between display voltage input end and circuit board voltage output end
One detection resistance, as shown in Figure 3.In fig. 3 it can be seen that the load end in figure just refers to display voltage input end, drive
Dynamic voltage end just refers to circuit board voltage input.
By measuring the pressure difference of voltage between display voltage input end and circuit board voltage output end, gained is recycled
Pressure difference can determine whether display breaks down compared with normal voltage range according to comparative result, and break down
Type.
In order that the object, technical solutions and advantages of the present invention are clearer, the present invention is made below in conjunction with accompanying drawing into
One step it is described in detail, it is clear that the described embodiment only a part of embodiment of the present invention, rather than whole implementation
Example.Based on the embodiment in the present invention, what those of ordinary skill in the art were obtained under the premise of creative work is not made
All other embodiment, belongs to the scope of protection of the invention.
As shown in figure 4, the method that the embodiment of the present invention carries out display detection includes：
Step 401：The pressure difference of the voltage at detection resistance both ends is determined, wherein described detection resistance one end and display are simple and elegant
Input is connected, and the other end is connected with circuit board voltage output end；
Step 402：If it is determined that the pressure difference not in normal voltage range, according to abnormal voltage scope and fault type
Corresponding relation determine fault type corresponding to abnormal voltage scope belonging to the pressure difference.
Optionally, the fault type of the embodiment of the present invention includes short circuit and open circuit：
The corresponding relation according to abnormal voltage scope and fault type determines the abnormal voltage model belonging to the pressure difference
Corresponding fault type is enclosed, including：
If it is determined that the pressure difference be more than normal voltage range maximum, it is determined that fault type for short circuit；Or
If it is determined that the pressure difference be less than normal voltage range maximum, it is determined that fault type for open circuit.
Wherein, normal voltage range can be determined by experiment when display is in normal operating conditions.It is assuming that normal
The maximum of voltage range is Vmax, minimum value Vmin：
If gained pressure difference is between 0~VminV, then being judged as circuit, there occurs open circuit；
If gained pressure difference is between Vmin~VmaxV, then decision circuitry is to be in normal voltage range；
If gained pressure difference is between Vmax~∞, then decision circuitry is in short-circuit condition.
Normal voltage is a scope rather than an absolute numerical value, so allows for the frequency that display breaks down
Greatly reduce.
Monitor and then feed back to from the background by installing with existing, the method that backstage is manually found the problem is compared：This hair
The bright failure that can not only find out display, moreover it is possible to the particular problem that detection display occurs in real time.Find out the problem of specific
With regard to that can suit the remedy to the case, the maintenance levels of display can be also improved accordingly.
Optionally, it is described determination detection resistance both ends pressure difference when, can in each horizontal-scanning interval section acquisition testing electricity
Press the voltage at both ends；
The voltage at one-time detection resistance both ends is often gathered, determines the pressure difference of one-time detection resistance both end voltage.
It is assumed that scanning a line needs 0.3 second, then can be gathered in the scanning duration of 0.3 second just in inspection corresponding to scan line
Survey the voltage at voltage both ends；
After the voltage at every collection one-time detection voltage both ends, the pressure difference of both end voltage is determined that.
If a display frequency there are N rows, N number of pressure difference will be obtained.
In force, which that may be set in per horizontal-scanning interval section as acquisition time at time point.
The embodiment of the present invention can be according to the acquisition time for determining clock signal acquisition testing resistance both end voltage.
The method that display is applicable progressive scan when being scanned, all horizontal lines of image are once shown, as one
Frame, reduce flicker.Compared with interlacing scan, even if viewing eyes are not easy to produce sense of fatigue for a long time.Using often scanning one
The secondary voltage that will record detection resistance both ends, the side of the pressure difference at resistance both ends will be calculated by often recording primary voltage
Method.It so also can in real time find the problem, timely feed back to backstage, problem is obtained timely adequate solution.
Alternatively, the acquisition time of the acquisition testing resistance both end voltage is determined according to clock signal.
Acquisition time is determined according to clock signal, after acquisition time reaches gather display control source terminal voltage and
Circuit board voltage output end voltage, obtain detection resistance both ends pressure difference.
Clock signal mentioned here has the property synchronous with the scan period of display screen driving, under including but is not limited to
Row are a kind of：
TP (source electrode latch signal), STV (frame scan initial signal).
For example it can be acquired when TP trailing edges reach；Gathered when STV rising edges reach.
Optionally, in order to be accurately positioned the position broken down, the embodiment of the present invention can also set a counting
Device.
Specifically, often gathering the voltage at one-time detection resistance both ends, all swept by counter plus a step value, and in all rows
After having retouched, the counter is emptied；
After the determination detection resistance both end voltage pressure difference, in addition to：
If it is determined that the pressure difference not in normal range (NR), according to the numerical value of nonce counter, determine that the display goes out
Existing location of fault.
Counter played a part of be exactly when the pressure difference between detection resistance both ends is in abnormal voltage scope, can
Timely feed back to backstage.At the time of this when, counter was just recorded now, reach record display device location of fault
Purpose.
Such as：
When starting to scan a line, counter adds 1 first, and clock signal difference acquisition testing resistance both ends display voltage is defeated
Enter that terminal voltage is designated as a, circuit board voltage output end is designated as b, the pressure difference that a-b obtains detection resistance both ends is designated as c；
Judge c whether between normal voltage (Vmax~Vmin).If it is then display picture is normal, now count
Number device will judge that this is last column, if so counter O reset；If not then scanning next line.
If c not in normal voltage range, judges whether c is more than Vmax；If c is more than Vmax, then decision circuitry
Generation short circuit, if c is less than Vmin, then open circuit occurs for decision circuitry.According to the numerical value of nonce counter, determine that display goes out
Existing location of fault.Now still to judge whether it is last column, if it is then counter O reset；If not, then
Then next line is scanned.
As shown in figure 5, the method for display of embodiment of the present invention detection comprises the following steps：
Step 501：Detection means scans a line；
Step 502：Counter adds 1；
Step 503：Acquisition time is determined according to clock signal, and collection display voltage is defeated after acquisition time reaches
Enter terminal voltage and circuit board voltage output end voltage, obtain detection resistance both ends pressure difference；
Step 504：Detection resistance both ends pressure difference is judged whether between normal voltage (Vmax~Vmin), if holding
Row step 507, if not then execution step 505；
Step 505：Judge whether detection resistance both ends pressure difference is more than Vmax, if it is determine that short circuit occurs for circuit, hold
Row step 506, if not then determining that open circuit occurs for circuit, perform step 506；
Step 506：According to the numerical value of nonce counter, determine the position that display breaks down and perform step 507；
Step 507：Whether the row for judging Current Scan is last column, if step 508 is performed, if not then holding
Row step 501；
Step 508：Counter O reset.
Based on same inventive concept, a kind of equipment for carrying out display detection is additionally provided in the embodiment of the present invention, due to
The method that the principle and the embodiment of the present invention of equipment solution problem interact demand adjustment is similar, therefore the implementation of the system
The implementation of method is may refer to, part is repeated and repeats no more.
As shown in fig. 6, the equipment that the embodiment of the present invention carries out display detection includes：
Detection resistance 600：For the realization for the detection for realizing voltage difference；
Voltage collector 601：Voltage for acquisition testing resistance both ends；
Comparator 603：For determine collection voltage pressure difference, however, it is determined that the pressure difference not in normal voltage range
It is interior, event corresponding to the abnormal voltage scope according to belonging to the corresponding relation of abnormal voltage scope and fault type determines the pressure difference
Hinder type；
Alternatively, the comparator 603 is additionally operable to：
It is determined that after detection resistance both end voltage pressure difference, however, it is determined that the pressure difference not in normal range (NR), according to work as
The numerical value of preceding counter, determine the position that the display breaks down.
The equipment also includes：
Counter 602：After the voltage that the voltage acquisition module often gathers one-time detection resistance both ends, by counter plus
One step value, and after all rows all scan through, empty the counter.
Voltage collector in Fig. 6 can be used as a device with detection resistance, can also be used as two devices.
Alternatively, the comparator is additionally operable to：
After the voltage that the voltage collector often gathers one-time detection resistance both ends, one-time detection resistance both ends electricity is determined
The pressure difference of pressure.
If a display frequency there are N rows, N number of pressure difference will be obtained.
Alternatively, the acquisition time of the acquisition testing resistance both end voltage is determined according to clock signal.
Clock signal mentioned here has the property synchronous with the scan period of display screen driving, under including but is not limited to
Row are a kind of：
Source electrode latch signal TP, frame scan initial signal STV.
Whether comparator is located at normal voltage range for the pressure difference of the voltage at detection resistance both ends measured by comparison in figure
Interior, if pressure difference is in normal voltage range, counter does not work；If pressure difference is more taller than the maximum of normal voltage,
So circuit is in short-circuit condition；If pressure difference is also smaller than the minimum value of normal voltage, then circuit is in off state.
Above by reference to the frame for showing method, apparatus according to embodiments of the present invention (system) and/or computer program product
Figure and/or the flow chart description present invention.It should be understood that it can realize that block diagram and/or flow illustrate by computer program instructions
One block of figure and the combination of block diagram and/or the block of flowchart illustration.These computer program instructions can be supplied to logical
With computer, the processor of special-purpose computer and/or other programmable data processing units, to produce machine so that via meter
The instruction that calculation machine processor and/or other programmable data processing units perform is created for realizing block diagram and/or flow chart block
In specified function/action method.
Correspondingly, the present invention can also be implemented with hardware and/or software (including firmware, resident software, microcode etc.).More
Further, the present invention can take computer to can be used or the shape of computer program product on computer-readable recording medium
Formula, it has the computer realized in media as well usable or computer readable program code, to be made by instruction execution system
With or combined command execution system and use.In the context of the present invention, computer can be used or computer-readable medium can be with
It is arbitrary medium, it can include, store, communicate, transmit or transmit program, to be made by instruction execution system, device or equipment
With, or combined command execution system, device or equipment use.
Obviously, those skilled in the art can carry out the essence of various changes and modification without departing from the present invention to the present invention
God and scope.So, if these modifications and variations of the present invention belong to the scope of the claims in the present invention and its equivalent technologies
Within, then the present invention is also intended to comprising including these changes and modification.
Claims (10)
- A kind of 1. method of display detection, it is characterised in that this method includes：The pressure difference of the voltage at detection resistance both ends is determined, wherein described detection resistance one end is connected with display voltage input end, The other end is connected with circuit board voltage output end；If it is determined that the pressure difference not in normal voltage range, it is true according to the corresponding relation of abnormal voltage scope and fault type Fault type corresponding to abnormal voltage scope belonging to the fixed pressure difference.
- 2. the method as described in claim 1, it is characterised in that described fault type includes short circuit and open circuit：The corresponding relation according to abnormal voltage scope and fault type determines the abnormal voltage scope pair belonging to the pressure difference The fault type answered, including：If it is determined that the pressure difference be more than normal voltage range maximum, it is determined that fault type for short circuit；OrIf it is determined that the pressure difference be less than normal voltage range maximum, it is determined that fault type for open circuit.
- 3. the method as described in claim 1, it is characterised in that determination detection resistance both ends pressure difference, including：The voltage at acquisition testing voltage both ends in each horizontal-scanning interval section；The voltage at one-time detection resistance both ends is often gathered, determines the pressure difference of one-time detection resistance both end voltage.
- 4. method as claimed in claim 3, it is characterised in that the acquisition time of the acquisition testing resistance both end voltage is root Determined according to clock signal.
- 5. method as claimed in claim 3, it is characterised in that this method also includes：The voltage at one-time detection resistance both ends is often gathered, by counter plus a step value, and after all rows all scan through, is emptied The counter；After the determination detection resistance both end voltage pressure difference, in addition to：If it is determined that the pressure difference not in normal range (NR), according to the numerical value of nonce counter, determine the display occur therefore The position of barrier.
- 6. a kind of equipment for carrying out display detection, it is characterised in that the equipment includes：Voltage collector, comparator and detection resistance；Wherein described detection resistance one end is connected with display voltage input end, separately One end is connected with circuit board voltage output end；Voltage collector, the voltage for acquisition testing resistance both ends；Comparator, for determine collection voltage pressure difference, however, it is determined that the pressure difference not in normal voltage range, according to different Often the corresponding relation of voltage range and fault type determines fault type corresponding to the abnormal voltage scope belonging to the pressure difference.
- 7. equipment as claimed in claim 6, it is characterised in that described fault type includes short circuit and open circuit：The comparator is specifically used for：If it is determined that the pressure difference be more than normal voltage range maximum, it is determined that fault type for short circuit；OrIf it is determined that the pressure difference be less than normal voltage range maximum, it is determined that fault type for open circuit.
- 8. equipment as claimed in claim 6, it is characterised in that the comparator is additionally operable to：After the voltage that the voltage collector often gathers one-time detection resistance both ends, one-time detection resistance both end voltage is determined Pressure difference.
- 9. equipment as claimed in claim 8, it is characterised in that the acquisition time of the acquisition testing resistance both end voltage is root Determined according to clock signal.
- 10. equipment as claimed in claim 8, it is characterised in that the equipment also includes：Counter；The counter is used for：After the voltage that the voltage acquisition module often gathers one-time detection resistance both ends, by counter plus a step value, and After all rows all scan through, the counter is emptied；The comparator is additionally operable to：It is determined that after detection resistance both end voltage pressure difference, however, it is determined that the pressure difference not in normal range (NR), according to current meter The numerical value of number device, determine the position that the display breaks down.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710729328.0A CN107342033B (en) | 2017-08-23 | 2017-08-23 | Method and equipment for detecting display picture |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710729328.0A CN107342033B (en) | 2017-08-23 | 2017-08-23 | Method and equipment for detecting display picture |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107342033A true CN107342033A (en) | 2017-11-10 |
| CN107342033B CN107342033B (en) | 2021-01-12 |
Family
ID=60215282
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710729328.0A Expired - Fee Related CN107342033B (en) | 2017-08-23 | 2017-08-23 | Method and equipment for detecting display picture |
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| Country | Link |
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| CN (1) | CN107342033B (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111816105A (en) * | 2020-06-05 | 2020-10-23 | 中国铁路北京局集团有限公司北京车辆段 | Passenger train electronic information display screen system detection method and device |
| EP4095839A4 (en) * | 2020-01-20 | 2023-07-19 | Yungu (Gu'an) Technology Co., Ltd. | Display panel test circuit and method, and display panel |
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| JP2000284740A (en) * | 1999-03-31 | 2000-10-13 | Nec Home Electronics Ltd | Dot defect decision device for dot matrix display unit |
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| EP4095839A4 (en) * | 2020-01-20 | 2023-07-19 | Yungu (Gu'an) Technology Co., Ltd. | Display panel test circuit and method, and display panel |
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Also Published As
| Publication number | Publication date |
|---|---|
| CN107342033B (en) | 2021-01-12 |
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