CN107342033B - Method and equipment for detecting display picture - Google Patents
Method and equipment for detecting display picture Download PDFInfo
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- CN107342033B CN107342033B CN201710729328.0A CN201710729328A CN107342033B CN 107342033 B CN107342033 B CN 107342033B CN 201710729328 A CN201710729328 A CN 201710729328A CN 107342033 B CN107342033 B CN 107342033B
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- 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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Abstract
The present invention relates to the field of display technologies, and in particular, to a method and an apparatus for detecting a display screen. For solving the problem of the display picture, no good solution is provided at present. According to the embodiment of the invention, the voltage of the voltage input end of the display and the voltage of the voltage output end of the circuit board is measured to obtain the voltage difference between the two ends of the detection resistor, the obtained voltage difference is compared with the normal voltage range, and if the voltage difference is not in the normal voltage range, the fault type corresponding to the abnormal voltage range to which the voltage difference belongs is further determined according to the corresponding relation between the abnormal voltage range and the fault type. Whether the display picture has a problem or not and the reason of the problem can be detected in real time, so that the problem that the display has a fault can be determined in time, and the display can be maintained in time.
Description
Technical Field
The present invention relates to the field of display technologies, and in particular, to a method and an apparatus for detecting a display screen.
Background
An LCD (liquid crystal display) is a flat thin type display device. It is favored by engineers because of its low power consumption.
Under the prerequisite of portable and transport, the advantage in fields such as right angle demonstration, small in size and zero radiation of liquid crystal display technique can both make the user enjoy the best visual effect. Unlike CRT technology, the LCD picture will not flash, and this can reduce the damage of the display to eye and make eye less fatigue. The driving method can be classified into three types, i.e., static driving, simple matrix driving, and active matrix driving.
Liquid crystal displays are also used in a wide range of applications, from television telephones for civilian use to radar for military use. A common display screen of a mobile phone computer is a liquid crystal display.
With the development of science and technology, the application of the liquid crystal display screen is more and more extensive. Displays of host machines of telecommunication and network rooms; monitoring displays of trains, subway stations and ports; on-board (train, subway, car) displays; advertisement machines (advertisement machines in living community elevators, public places, commercial office buildings and the like play commercial advertisements). Typically, the location of these applications is not fixed. On the other hand, the distance from the manufacturer is long and the installation and the disassembly are not easy. These reasons all make the LCD screen have no way to get the manual maintenance in time.
One currently feasible approach is: whether the power-on working state of the liquid crystal display is normal is detected in a wireless transmission mode: when the display is powered on, the picture characteristics at the moment are recorded firstly, the camera is installed to transmit the picture characteristics to the background, and the background judges whether the display works normally or not manually. However, this method can only detect whether the display is working normally when it is powered on, and there is no way to evaluate the specific cause of the problem.
In summary, there is no good solution for the detection means of the display screen having problems.
Disclosure of Invention
The invention provides a method and equipment for detecting a display, which are used for solving the problem that no good method is available at present for detecting the problem of a display picture.
The embodiment of the invention provides a method for detecting a display, which comprises the following steps:
determining the voltage difference of the voltages at two ends of a detection resistor, wherein one end of the detection resistor is connected with the voltage input end of the display, and the other end of the detection resistor is connected with the voltage output end of the circuit board;
and if the determined differential pressure is not in the normal voltage range, determining the fault type corresponding to the abnormal voltage range to which the differential pressure belongs according to the corresponding relation between the abnormal voltage range and the fault type.
Optionally, the fault types include short circuit and open circuit:
determining the fault type corresponding to the abnormal voltage range to which the voltage difference belongs according to the corresponding relation between the abnormal voltage range and the fault type, wherein the fault type comprises the following steps:
if the determined voltage difference is larger than the maximum value of the normal voltage range, determining that the fault type is short circuit; or
And if the determined differential pressure is smaller than the maximum value of the normal voltage range, determining that the fault type is open circuit.
Optionally, the acquisition time for acquiring the voltage across the detection resistor is determined according to the frame scanning start signal STV signal.
Optionally, the method further comprises:
every time the voltage at two ends of the detection resistor is collected, adding a step length value to the counter, and emptying the counter after all the rows are scanned;
after the voltage difference between the two ends of the detection resistor is determined, the method further comprises the following steps:
and if the determined pressure difference is not in the normal range, determining the position of the display with the fault according to the value of the current counter.
The embodiment of the invention provides a display detection device, which comprises:
the voltage collector, the comparator and the detection resistor; one end of the detection resistor is connected with the voltage input end of the display, and the other end of the detection resistor is connected with the voltage output end of the circuit board;
the voltage collector is used for collecting the voltages at two ends of the detection resistor;
and the comparator is used for determining the voltage difference of the acquired voltage, and determining the fault type corresponding to the abnormal voltage range to which the voltage difference belongs according to the corresponding relation between the abnormal voltage range and the fault type if the determined voltage difference is not in the normal voltage range.
Optionally, the fault types include short circuit and open circuit:
the comparator is specifically configured to:
if the determined voltage difference is larger than the maximum value of the normal voltage range, determining that the fault type is short circuit; or
And if the determined differential pressure is smaller than the maximum value of the normal voltage range, determining that the fault type is open circuit.
Optionally, the comparator is further configured to:
and after the voltage collector collects the voltages at the two ends of the detection resistor once, determining the voltage difference of the voltages at the two ends of the detection resistor once.
Optionally, the collecting time for collecting the voltage across the detection resistor is determined according to a timing signal.
Optionally, the apparatus further comprises: a counter;
the counter is used for:
after the voltage acquisition module acquires the voltage at the two ends of the detection resistor once, adding a step length value to the counter, and emptying the counter after all rows are scanned;
the comparator is further configured to:
after the voltage difference between the two ends of the detection resistor is determined, if the determined voltage difference is not in a normal range, the position of the display with a fault is determined according to the value of the current counter.
According to the embodiment of the invention, the voltage of the voltage input end of the display and the voltage of the voltage output end of the circuit board is measured to obtain the voltage difference between the two ends of the detection resistor, the obtained voltage difference is compared with the normal voltage range, and if the voltage difference is not in the normal voltage range, the fault type corresponding to the abnormal voltage range to which the voltage difference belongs is further determined according to the corresponding relation between the abnormal voltage range and the fault type. According to the embodiment of the invention, the fault type corresponding to the abnormal voltage range to which the voltage difference belongs can be determined according to the corresponding relation between the abnormal voltage range and the fault type, so that whether a display picture has a problem or not and the reason of the problem can be detected in real time, the problem that the display has the fault can be determined in time, and the display can be maintained in time.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise.
FIG. 1 is a schematic diagram of a source latch signal (TP) for collecting a voltage difference between two ends of a detection resistor according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a voltage difference between two ends of a detection resistor collected by a frame start Signal (STV) according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of the connection relationship of the detection resistors according to the embodiment of the present invention;
FIG. 4 is a flowchart illustrating a method for detecting a display according to an embodiment of the present invention;
FIG. 5 is a flowchart illustrating a method for performing a complete display inspection according to an embodiment of the present invention;
fig. 6 is a schematic structural diagram of an apparatus for performing display inspection according to an embodiment of the present invention.
Detailed Description
The display is shown in fig. 1 under normal operation:
normally, the gate power supply voltage is pulled low when the timing signal (taking the source latch signal TP as an example) is at a low level.
The operation of the display in the off state is shown in fig. 2. As can be seen from the figure: before the rising edge of the timing signal (in this case, the frame timing signal STV is taken as an example), a series of gate supply voltages are not pulled down by the load, and the series of signals are waveforms of the gate supply voltages when the gate is open.
Similarly, when the display is in a short circuit, the gate supply voltage is also pulled low by the load. The gate supply voltage will be the same as the shorting voltage.
Here again taking fig. 2 as an example: if the gate is shorted to ground, the recessed area in the figure will be changed to 0V; if the gate is shorted to the signal of bV, the recessed area becomes bV.
That is, if the display is in a short circuit or open circuit, the depressed areas are distinguished from those under normal operation.
Based on the above principle, the embodiment of the present invention adds a detection resistor between the voltage input terminal of the display and the voltage output terminal of the circuit board, as shown in fig. 3. As can be seen in fig. 3, the load terminal in the figure is the display voltage input terminal, and the driving voltage terminal is the circuit board voltage input terminal.
By measuring the voltage difference between the voltage input end of the display and the voltage output end of the circuit board, the obtained voltage difference is compared with the normal voltage range, and whether the display fails or not and the type of the failure can be determined according to the comparison result.
In order to make the objects, technical solutions and advantages of the present invention clearer, the present invention will be described in further detail with reference to the accompanying drawings, and it is apparent that the described embodiments are only a part of the embodiments of the present invention, not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 4, the method for detecting a display according to an embodiment of the present invention includes:
step 401: determining the voltage difference of the voltages at two ends of a detection resistor, wherein one end of the detection resistor is connected with the elegant input end of the display, and the other end of the detection resistor is connected with the voltage output end of the circuit board;
step 402: and if the determined differential pressure is not in the normal voltage range, determining the fault type corresponding to the abnormal voltage range to which the differential pressure belongs according to the corresponding relation between the abnormal voltage range and the fault type.
Optionally, the fault types of the embodiment of the present invention include short circuit and open circuit:
the determining the fault type corresponding to the abnormal voltage range to which the voltage difference belongs according to the corresponding relation between the abnormal voltage range and the fault type comprises the following steps:
if the determined voltage difference is larger than the maximum value of the normal voltage range, determining that the fault type is short circuit; or
And if the determined differential pressure is smaller than the maximum value of the normal voltage range, determining that the fault type is open circuit.
Wherein the normal voltage range may be determined experimentally when the display is in a normal operating state. Assuming that the maximum value of the normal voltage range is Vmax, the minimum value is Vmin:
if the obtained voltage difference is between 0 and VminV, the circuit is judged to be broken;
if the obtained voltage difference is between Vmin and VmaxV, the circuit is judged to be in a normal voltage range;
if the obtained differential pressure is between Vmax and infinity, the circuit is judged to be in a short-circuit state.
The normal voltage is a range rather than an absolute value, which results in a significant reduction in the frequency of display failures.
Compared with the existing method of manually finding problems by a background through installing monitoring and then feeding back the monitoring to the background: the invention can not only find out the fault of the display, but also detect the specific problem of the display in real time. Finding out specific problems can be used for symptomatic medicine administration, and accordingly, the maintenance level of the display can be improved.
Optionally, when the voltage difference between the two ends of the detection resistor is determined, the voltages at the two ends of the detection voltage may be collected in each line scanning time period;
and determining the voltage difference of the voltages at the two ends of the detection resistor every time the voltages at the two ends of the detection resistor are collected.
Assuming that a scanning line needs 0.3 second, the voltages at two ends of the detection voltage corresponding to the scanning line can be collected within the scanning time of 0.3 second;
after the voltage across the voltage is detected each time, the voltage difference between the voltages is determined.
If there are N rows of a display, N differential pressures are obtained.
In an implementation, which time point within each line scan period may be set as the acquisition time.
The embodiment of the invention can acquire the acquisition time of the voltage at the two ends of the detection resistor according to the determined time sequence signal.
The display is adapted to a progressive scanning method when scanning, and displays all horizontal lines of an image at a time as one frame, reducing flicker. Compared with interlaced scanning, the eye is less likely to feel tired even if the eye is viewed for a long time. The method of recording the voltage at two ends of the detection resistor every time of scanning and calculating the voltage difference at two ends of the resistor every time of recording the voltage is adopted. Therefore, the problem can be found out in real time and fed back to the background in time, so that the problem can be solved timely and properly.
Optionally, the collecting time for collecting the voltage across the detection resistor is determined according to a timing signal.
And determining acquisition time according to the time sequence signal, and acquiring the voltage at the voltage input end of the display and the voltage at the voltage output end of the circuit board after the acquisition time is up to obtain the voltage difference between the two ends of the detection resistor.
The timing signal has a property of synchronizing with the scanning period of the display screen drive, including but not limited to one of the following:
TP (source latch signal), STV (frame scanning start signal).
For example, the acquisition can be performed when the TP falling edge arrives; collected when the STV rising edge arrives.
Optionally, in order to accurately locate the position where the fault occurs, a counter may be further provided in the embodiment of the present invention.
Specifically, every time the voltage at two ends of the detection resistor is collected, a step length value is added to the counter, and after all rows are scanned, the counter is emptied;
after the voltage difference between the two ends of the detection resistor is determined, the method further comprises the following steps:
and if the determined pressure difference is not in the normal range, determining the position of the display with the fault according to the value of the current counter.
The counter plays a role in feeding back to the background in time when the voltage difference between two ends of the detection resistor is in an abnormal voltage range. At this time, the counter records the time of the moment, and the purpose of recording the fault position of the display is achieved.
Such as:
when scanning a line, firstly adding 1 to a counter, respectively acquiring the voltage of a display voltage input end at two ends of a detection resistor and recording the voltage as a, the voltage of a circuit board voltage output end as b by using a time sequence signal, and recording the voltage difference at two ends of the detection resistor as c by using a-b;
and judging whether c is between normal voltages (Vmax-Vmin). If so, the display screen is normal, the counter judges whether the display screen is the last line or not, and if so, the counter is cleared; if the next row is not scanned next.
If c is not in the normal voltage range, judging whether c is larger than Vmax; if c is larger than Vmax, the circuit is judged to be short-circuited, and if c is smaller than Vmin, the circuit is judged to be open-circuited. And determining the fault position of the display according to the value of the current counter. At the moment, whether the line is the last line or not is still judged, and if the line is the last line, the counter is cleared; if not, then the next row is scanned next.
As shown in fig. 5, the method for detecting a display according to an embodiment of the present invention includes the following steps:
step 501: the detection device scans one line;
step 502: adding 1 to the counter;
step 503: determining acquisition time according to the time sequence signal, and acquiring the voltage at the voltage input end of the display and the voltage at the voltage output end of the circuit board after the acquisition time is up to obtain the voltage difference between the two ends of the detection resistor;
step 504: judging whether the voltage difference between two ends of the detection resistor is between normal voltages (Vmax-Vmin), if so, executing a step 507, and if not, executing a step 505;
step 505: judging whether the voltage difference between two ends of the detection resistor is larger than Vmax, if so, determining that the circuit is short-circuited, executing step 506, otherwise, determining that the circuit is open-circuited, and executing step 506;
step 506: determining the position of the display with fault according to the value of the current counter and executing step 507;
step 507: judging whether the currently scanned line is the last line, if so, executing step 508, and if not, executing step 501;
step 508: the counter is cleared.
Based on the same inventive concept, the embodiment of the present invention further provides a device for detecting a display, and since the principle of the device for solving the problem is similar to the method for adjusting the interaction requirement in the embodiment of the present invention, the implementation of the system may refer to the implementation of the method, and repeated details are not repeated.
As shown in fig. 6, the apparatus for performing display inspection according to the embodiment of the present invention includes:
detection resistance 600: the detection of the voltage difference is realized;
the voltage collector 601: the voltage acquisition device is used for acquiring the voltage at two ends of the detection resistor;
the comparator 603: the fault type detection circuit is used for determining the voltage difference of the acquired voltage, and if the determined voltage difference is not in the normal voltage range, determining the fault type corresponding to the abnormal voltage range to which the voltage difference belongs according to the corresponding relation between the abnormal voltage range and the fault type;
optionally, the comparator 603 is further configured to:
after the voltage difference between the two ends of the detection resistor is determined, if the determined voltage difference is not in a normal range, the position of the display with a fault is determined according to the value of the current counter.
The apparatus further comprises:
the counter 602: and after the voltage acquisition module acquires the voltage at the two ends of the detection resistor once, adding a step length value to the counter, and emptying the counter after all the rows are scanned.
The voltage collector and the detection resistor in fig. 6 may be used as one device or two devices.
Optionally, the comparator is further configured to:
and after the voltage collector collects the voltages at the two ends of the detection resistor once, determining the voltage difference of the voltages at the two ends of the detection resistor once.
If there are N rows of a display, N differential pressures are obtained.
Optionally, the collecting time for collecting the voltage across the detection resistor is determined according to a timing signal.
The timing signal has a property of synchronizing with the scanning period of the display screen drive, including but not limited to one of the following:
a source latch signal TP, and a frame scanning start signal STV.
The comparator in the figure is used for comparing whether the voltage difference of the voltage measured at the two ends of the detection resistor is within a normal voltage range, and if the voltage difference is within the normal voltage range, the counter does not work; if the voltage difference is higher than the maximum value of the normal voltage, the circuit is in a short-circuit state; if the voltage difference is smaller than the minimum value of the normal voltage, the circuit is in an open state.
The present invention is described above with reference to block diagrams and/or flowchart illustrations of methods, apparatus (systems) and/or computer program products according to embodiments of the invention. It will be understood that one block of the block diagrams and/or flowchart illustrations, and combinations of blocks in the block diagrams and/or flowchart illustrations, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, and/or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer and/or other programmable data processing apparatus, create means for implementing the functions/acts specified in the block diagrams and/or flowchart block or blocks.
Accordingly, the present invention may also be embodied in hardware and/or in software (including firmware, resident software, micro-code, etc.). Furthermore, the invention can take the form of a computer program product on a computer-usable or computer-readable storage medium having computer-usable or computer-readable program code embodied in the medium for use by or in connection with an instruction execution system. In the context of this document, a computer-usable or computer-readable medium may be any medium that can contain, store, communicate, propagate, or transport the program for use by or in connection with the instruction execution system, apparatus, or device.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (6)
1. A method of display inspection, the method comprising:
determining the voltage difference of the voltages at two ends of a detection resistor, wherein one end of the detection resistor is connected with the voltage input end of the display, and the other end of the detection resistor is connected with the voltage output end of the circuit board;
if the determined differential pressure is not in the normal voltage range, determining a fault type corresponding to the abnormal voltage range to which the differential pressure belongs according to the corresponding relation between the abnormal voltage range and the fault type;
the determining a voltage difference of the voltage across the sense resistor includes:
collecting voltages at two ends of the detection resistor in each line scanning time period;
determining the voltage difference of the voltages at the two ends of the primary detection resistor every time the voltages at the two ends of the primary detection resistor are collected;
every time the voltage at two ends of the detection resistor is collected, adding a step length value to the counter, and emptying the counter after all the rows are scanned;
after the voltage difference between the two ends of the detection resistor is determined, the method further comprises the following steps:
and if the determined differential pressure is not in the normal voltage range, determining the position of the display with the fault according to the value of the current counter.
2. The method of claim 1, wherein said fault types include short circuit and open circuit:
the determining the fault type corresponding to the abnormal voltage range to which the voltage difference belongs according to the corresponding relation between the abnormal voltage range and the fault type comprises the following steps:
if the determined voltage difference is larger than the maximum value of the normal voltage range, determining that the fault type is short circuit; or
And if the determined differential pressure is smaller than the minimum value of the normal voltage range, determining that the fault type is open circuit.
3. The method of claim 1, wherein the acquisition time for acquiring the voltage across the detection resistor is determined based on a timing signal.
4. An apparatus for performing display inspection, the apparatus comprising:
the voltage collector, the comparator and the detection resistor; one end of the detection resistor is connected with the voltage input end of the display, and the other end of the detection resistor is connected with the voltage output end of the circuit board;
the voltage collector is used for collecting the voltages at two ends of the detection resistor;
the comparator is used for determining the voltage difference of the acquired voltage, and determining the fault type corresponding to the abnormal voltage range to which the voltage difference belongs according to the corresponding relation between the abnormal voltage range and the fault type if the determined voltage difference is not in the normal voltage range;
the comparator is further configured to:
after the voltage collector collects the voltage at the two ends of the detection resistor once, determining the voltage difference of the voltage at the two ends of the detection resistor once;
the apparatus further comprises: a counter;
the counter is used for:
after the voltage collector collects the voltage at two ends of the detection resistor once, adding a step length value to the counter, and emptying the counter after all rows are scanned;
the comparator is further configured to:
after the voltage difference between the two ends of the detection resistor is determined, if the determined voltage difference is not in the normal voltage range, the position of the display with the fault is determined according to the value of the current counter.
5. The apparatus of claim 4, wherein said fault types include short circuit and open circuit:
the comparator is specifically configured to:
if the determined voltage difference is larger than the maximum value of the normal voltage range, determining that the fault type is short circuit; or
And if the determined differential pressure is smaller than the minimum value of the normal voltage range, determining that the fault type is open circuit.
6. The apparatus of claim 4, wherein the acquisition time to acquire the voltage across the detection resistor is determined from a timing signal.
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| CN201710729328.0A CN107342033B (en) | 2017-08-23 | 2017-08-23 | Method and equipment for detecting display picture |
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| CN111128063B (en) | 2020-01-20 | 2021-03-23 | 云谷（固安）科技有限公司 | Display panel test circuit and method and display panel |
| 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 |
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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 |
| CN103700332A (en) * | 2013-12-11 | 2014-04-02 | 京东方科技集团股份有限公司 | Display device |
| CN104464586A (en) * | 2014-12-30 | 2015-03-25 | 京东方科技集团股份有限公司 | Display panel detection device and method |
| CN106128342A (en) * | 2016-06-24 | 2016-11-16 | 京东方科技集团股份有限公司 | The detection method of array base palte, display device and array base palte |
| CN106251798A (en) * | 2016-08-08 | 2016-12-21 | 深圳市华星光电技术有限公司 | OLED display drive circuit defect inspection method |
| CN106448522A (en) * | 2016-10-20 | 2017-02-22 | 京东方科技集团股份有限公司 | Detection circuit, gate drive circuit and display panel |
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2017
- 2017-08-23 CN CN201710729328.0A patent/CN107342033B/en not_active Expired - Fee Related
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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 |
| CN103700332A (en) * | 2013-12-11 | 2014-04-02 | 京东方科技集团股份有限公司 | Display device |
| CN104464586A (en) * | 2014-12-30 | 2015-03-25 | 京东方科技集团股份有限公司 | Display panel detection device and method |
| CN106128342A (en) * | 2016-06-24 | 2016-11-16 | 京东方科技集团股份有限公司 | The detection method of array base palte, display device and array base palte |
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| CN106448522A (en) * | 2016-10-20 | 2017-02-22 | 京东方科技集团股份有限公司 | Detection circuit, gate drive circuit and display panel |
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