CN111579903A - Display module testing tool and testing method - Google Patents
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- CN111579903A CN111579903A CN202010417807.0A CN202010417807A CN111579903A CN 111579903 A CN111579903 A CN 111579903A CN 202010417807 A CN202010417807 A CN 202010417807A CN 111579903 A CN111579903 A CN 111579903A
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- 238000012360 testing method Methods 0.000 title claims abstract description 141
- 238000000034 method Methods 0.000 claims abstract description 24
- 230000008569 process Effects 0.000 claims abstract description 18
- 238000010998 test method Methods 0.000 claims abstract description 6
- 238000012544 monitoring process Methods 0.000 claims description 6
- 230000006353 environmental stress Effects 0.000 abstract description 8
- 238000007689 inspection Methods 0.000 description 4
- 238000004378 air conditioning Methods 0.000 description 3
- 230000008901 benefit Effects 0.000 description 3
- 230000008859 change Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 230000005856 abnormality Effects 0.000 description 1
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- 239000003086 colorant Substances 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
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- 230000009977 dual effect Effects 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/003—Environmental or reliability tests
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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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Abstract
The invention provides a display module test tool and a test method, wherein the display module test tool comprises a test base, a voltage converter, a display screen and an interface module, wherein the voltage converter, the display screen and the interface module are arranged on the test base; the interface module is used for connecting a display module to be tested; the voltage converter is connected with the display module through the interface module and used for providing test voltage for the display module according to a preset voltage supply strategy; and the display screen is connected with the voltage converter and is used for displaying the test voltage provided by the voltage converter. The display module testing tool provided by the invention can test the reliability of the whole display module after verifying the assembly of devices in the process, and realizes the test by changing the test conditions of the display module and combining the environmental stress, so that the testing accuracy is improved, modules with shorter service life can be screened out, the display modules flowing to the subsequent process are all long-service-life display modules, and the reliability of the whole machine is improved.
Description
Technical Field
The invention relates to the technical field of hardware testing, in particular to a display module testing tool and a testing method.
Background
With the rapid development of electrical equipment, the display function is regarded as an application requirement of the electrical equipment, and the display performance of the electrical equipment is receiving more and more attention. In the prior art, a display module is used for displaying the running state of the whole machine on electrical equipment. For example, for air-conditioning equipment, a user can intuitively read the set temperature, the running mode and the like of the air conditioner through the display module, when the air-conditioning equipment reports a fault, the fault code can be displayed through the display module, and the fault reason is locked according to the fault code. However, when the display module itself fails, the electrical equipment loses the man-machine communication, and even if the functions of air conditioning, cooling, heating, and the like are normal, the after-sales complaints may be caused.
At present, although the display module is subjected to reliability test in the factory, the reliability test mainly involves two types of durability tests, namely, a pulse current durability test and an electrical durability test, and neither durability test has environmental requirements. Although the two types of durability can screen the colors and the performances of the light-emitting diodes, special environmental stress is not applied in combination with the assembly problem of the light-emitting diodes on the module, and the reliability of the whole module after the devices are assembled in the process cannot be verified.
Disclosure of Invention
In view of the above problems, the invention provides a display module testing tool and a testing method, so as to solve the problem that in the prior art, a reliability test of a display module does not apply special environmental stress in combination with the assembly problem of a light emitting diode on the module, and the reliability of the whole module after the device is assembled in the process cannot be verified.
In one aspect of the invention, a display module testing tool is provided, which comprises a testing base, and a voltage converter, a display screen and an interface module which are arranged on the testing base;
the interface module is used for connecting a display module to be tested;
the voltage converter is connected with the display module through the interface module and used for providing test voltage for the display module according to a preset voltage supply strategy;
and the display screen is connected with the voltage converter and is used for displaying the test voltage provided by the voltage converter.
The voltage converter comprises a PLC (programmable logic controller), an intermediate relay and a direct-current power supply, wherein the intermediate relay and the direct-current power supply are respectively connected with the PLC;
the direct current power supply is used for outputting direct current voltages with different amplitudes;
the PLC is used for controlling the direct current power supply to periodically output direct current voltages with different voltage amplitudes according to a preset time length, and controlling the on-off of the intermediate relay to supply the direct current voltages with different voltage amplitudes to the display module according to a preset switching time interval.
The display module testing tool further comprises an indicator light module, and the indicator light module is used for making corresponding indication according to the working state of the voltage converter.
The display module testing tool further comprises a monitoring module used for monitoring the display state information of the display module in the testing process.
The display module testing tool further comprises a temperature sensor used for collecting temperature information of the environment where the display module is located in the testing process.
In another aspect of the present invention, a testing method based on the display module testing tool described above is provided, where the method includes:
providing a test voltage for a display module to be tested according to a preset voltage supply strategy;
acquiring display state information of the display module under the current test voltage;
and judging the display performance of the display module according to the display state information of the display module under the current test voltage.
Wherein, the display module that provides the test voltage to awaiting measuring according to preset voltage supply strategy includes:
determining two direct current voltages with different voltage amplitudes according to a preset multiple of the rated voltage of the display module;
and periodically outputting the rated voltage and the two direct current voltages with different voltage amplitudes according to a preset time length, and controlling the rated voltage and the two direct current voltages with different voltage amplitudes to be supplied to the display module according to a preset switching time interval.
The preset time length is 5s-15s, and the switching time interval is 2s-8 s.
The two direct current voltages with different voltage amplitudes are respectively 0.86-0.94 times and 1.06-1.10 times of the rated voltage of the display module.
Wherein the method further comprises: the temperature information of the environment where the display module is located in the testing process is collected, and the testing environment temperature is controlled according to the temperature information so as to keep the testing environment at the preset testing temperature.
The display module testing tool and the testing method provided by the embodiment of the invention can test the reliability of the whole display module after the device is verified to be assembled in the process, the testing is realized by changing the testing conditions of the display module and combining the environmental stress, the testing accuracy is improved, further, the modules with shorter service life can be screened out, the display modules flowing to the subsequent procedures are all the display modules with long service life, and the reliability of the whole machine is improved.
The foregoing description is only an overview of the technical solutions of the present invention, and the embodiments of the present invention are described below in order to make the technical means of the present invention more clearly understood and to make the above and other objects, features, and advantages of the present invention more clearly understandable.
Drawings
Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. Also, like reference numerals are used to refer to like parts throughout the drawings. In the drawings:
fig. 1 is a schematic structural diagram of a display module testing tool according to an embodiment of the present invention;
fig. 2 is a schematic flow chart of a testing method based on a display module testing tool according to an embodiment of the present invention.
Detailed Description
Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.
It will be understood by those skilled in the art that, unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the prior art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.
Fig. 1 schematically illustrates a structural schematic diagram of a display module testing tool according to an embodiment of the present invention. Referring to fig. 1, a display module testing tool provided in an embodiment of the present invention includes a testing base 10, a voltage converter 20 disposed inside the testing base 10, a display screen 30 disposed on an outer casing of the testing base 10, and an interface module 40, where the display screen 30 and the interface module 40 may be distributed on a top surface and/or a side surface of the outer casing, specifically:
the interface module 40 is used for connecting a display module to be tested;
the voltage converter 20 is connected to the display module to be tested through the interface module 40, and is configured to provide a test voltage for the display module according to a preset voltage supply strategy;
the display screen 30 is connected to the voltage converter 20 and configured to display the test voltage provided by the voltage converter 20.
In this embodiment, the display module to be tested is an integral module obtained by assembling the light emitting diodes.
Further, a start button and a stop button are arranged on the test base 10 of the display module test tool.
The display module testing tool provided by the invention can test the reliability of the whole display module after verifying the assembly of the device in the process, and realizes the test by changing the test conditions of the display module and combining the environmental stress, thereby improving the test accuracy.
Specifically, the voltage converter 20 includes a PLC controller, an intermediate relay and a dc power supply, the intermediate relay and the dc power supply are respectively connected to the PLC controller, wherein:
the direct current power supply is used for outputting direct current voltages with different amplitudes;
the PLC is used for controlling the direct current power supply to periodically output direct current voltages with different voltage amplitudes according to a preset time length, and controlling the on-off of the intermediate relay to supply the direct current voltages with different voltage amplitudes to the display module according to a preset switching time interval.
In this embodiment, the PLC controller is programmed to output 24V1, 24V2, and 24V3 control voltages to set the output time and the output interval time. Three 24V voltages output by the PLC are respectively introduced into three intermediate relays (K1\ K2\ K3) with 24V working voltages, and the direct-current voltage output is controlled by utilizing the working principle of the intermediate relays (the pins 1 and 3 are normally open, and the pins 2 and 3 are normally closed).
In this embodiment, the preset time length is 5s to 15s, and the switching time interval is 2s to 8 s. The preset time length is preferably 10s, and the switching time interval is preferably 5 s.
In this embodiment, the two dc voltages with different voltage amplitudes are respectively 0.86-0.94 times and 1.06-1.10 times of the rated voltage of the display module.
The combined appliance is supplied with the worst voltage between 0.94 and 1.06 times the rated voltage according to the national standard. The display module testing tool provided by the embodiment of the invention can automatically switch the testing direct-current voltage to enable the voltage to be switched among 0.94 times of rated voltage, rated voltage and 1.06 times of rated voltage, and is placed in a high-temperature chamber of a laboratory, for example, the temperature can be 50 ℃, and the screening degree of welding of components in a module can be improved by combining the action of high temperature on the module.
In a specific example, a PLC controller is adopted to realize automatic power supply switching through program editing, the rated power supply voltage of a display module to be tested is 12V, automatic control is realized through the PLC, 11.28V and 12.72V are calculated according to the rated voltage of 0.94 time and the rated voltage of 1.06 time respectively, due to the fact that errors exist in a voltage source, the 11.28V and the 12.72V can be within the error fluctuation range of the rated voltage, and the effect of voltage shock cannot be achieved, the voltage can be set to be 0.86 times of the rated voltage and 1.10 times of the rated voltage, the voltage can be switched circularly between the U value (the rated voltage 12V) -0.86 times of the U value (10.32V) -1.10 times of the U value (13.20V), and the switching frequency can be set to be 15 s/time. The working temperature of the display module is-30-80 ℃, the storage temperature is-40-100 ℃, and the aging temperature of the display module is generally set to be 50 ℃.
Further, referring to fig. 2, the display module testing tool provided in this embodiment further includes an indicator light module 50, where the indicator light module 50 is configured to make a corresponding indication according to the working state of the voltage converter.
In this embodiment, the indicator module 50 of the tool includes: the device comprises a green indicator light, a yellow indicator light and a red indicator light, wherein the green indicator light is lighted to indicate normal operation; when the yellow indicator light is turned on, the switching waiting is indicated; and when the red indicator light is turned on, the running is stopped.
Further, the display module test fixture provided by this embodiment further includes a monitoring module, not shown in the drawings, for monitoring the display state information of the display module during the test process, so as to determine the display performance of the display module according to the display state information of the display module under the current test voltage.
In actual test, the display module can display in a full screen mode when normally powered on, darkening can occur when abnormality occurs, and the display performance of the display module can be judged through display state information under the current test voltage when inspection is carried out on a patrol point.
Further, the display module testing tool provided by the embodiment further comprises a temperature sensor which is not shown in the attached drawings and is used for collecting temperature information of the environment where the display module is located in the testing process.
Because the display panel is used at the indoor set of air conditioner, is connected with the controller of air conditioner, and the air conditioner start display will work, and operating environment temperature is 48 ~ 50 ℃, and the during operation does not have obvious change, therefore ambient temperature sets up a constant temperature test can, the temperature of display does not change along with complete machine instruction change, combines many aspects such as test condition and experimental resources to consider, and the test scheme is decided preferably:
ambient temperature: high temperature indoor air-conditioner test (ambient temperature 48-50 degree)
Test voltage: 10.32V, 12V, 13.20V
Switching time: the time for holding at each voltage is 10s, and the switching to another voltage is stopped for 5s
Total test time: 1000h
Sample sampling inspection mode: randomly drawing one code test for each quarter of each manufacturer
Sample number: 3 are provided with
In addition, when the display module test tool provided by the invention is used for testing, a test recording mode is adopted: the test record book records the manufacturer, the code, the test starting time and the daily spot test result. The additional record of the inspection record is additionally made for the operation of the unnormalized test, and the information of the current sample can be determined when the external inspection is carried out, so that the reliability test is more normalized.
The invention can test the dual functions of voltage impact and environmental stress of the whole display module after assembly in the process, and further can expose the module with problems in advance and control the module at the front end, thereby prolonging the average service life of the whole module and improving the reliability of the whole display module.
Fig. 2 is a schematic flow chart of a testing method based on the display module testing tool according to an embodiment of the present invention. Referring to fig. 2, the test method based on the display module test fixture provided by the embodiment of the invention specifically includes the following steps:
and S11, providing a test voltage to the display module to be tested according to a preset voltage supply strategy.
And S12, acquiring the display state information of the display module under the current test voltage.
And S13, judging the display performance of the display module according to the display state information of the display module under the current test voltage.
The testing method based on the display module testing tool provided by the embodiment of the invention can test the reliability of the whole display module after the device is verified to be assembled in the process, and the testing is realized by changing the testing conditions of the display module and combining the environmental stress, so that the testing accuracy is improved.
In this embodiment, the step S11 of providing the test voltage to the display module to be tested according to the preset voltage supply strategy specifically includes the following steps that are not shown in the following drawings:
s111, determining two direct current voltages with different voltage amplitudes according to preset multiples of rated voltage of the display module;
and S112, periodically outputting the rated voltage and the two direct current voltages with different voltage amplitudes according to a preset time length, and controlling the rated voltage and the two direct current voltages with different voltage amplitudes to be supplied to the display module according to a preset switching time interval.
Wherein the preset time length is 5-15s, and the switching time interval is 2-8 s.
The two direct current voltages with different voltage amplitudes are respectively 0.86-0.94 times and 1.06-1.10 times of the rated voltage of the display module.
Further, the test method based on the display module test tool provided by the embodiment of the invention further comprises the following steps: the temperature information of the environment where the display module is located in the testing process is collected, and the testing environment temperature is controlled according to the temperature information so as to keep the testing environment at the preset testing temperature.
The display module testing tool and the testing method provided by the embodiment of the invention can test the reliability of the whole display module after the device is verified to be assembled in the process, the testing is realized by changing the testing conditions of the display module and combining the environmental stress, the testing accuracy is improved, further, the modules with shorter service life can be screened out, the display modules flowing to the subsequent procedures are all the display modules with long service life, and the reliability of the whole machine is improved.
Those skilled in the art will appreciate that while some embodiments herein include some features included in other embodiments, rather than others, combinations of features of different embodiments are meant to be within the scope of the invention and form different embodiments. For example, in the following claims, any of the claimed embodiments may be used in any combination.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (10)
1. A display module testing tool is characterized by comprising a testing base, a voltage converter, a display screen and an interface module, wherein the voltage converter, the display screen and the interface module are arranged on the testing base;
the interface module is used for connecting a display module to be tested;
the voltage converter is connected with the display module through the interface module and used for providing test voltage for the display module according to a preset voltage supply strategy;
and the display screen is connected with the voltage converter and is used for displaying the test voltage provided by the voltage converter.
2. The display module test tool of claim 1, wherein the voltage converter comprises a PLC controller, an intermediate relay and a DC power supply, and the intermediate relay and the DC power supply are respectively connected with the PLC controller;
the direct current power supply is used for outputting direct current voltages with different amplitudes;
the PLC is used for controlling the direct current power supply to periodically output direct current voltages with different voltage amplitudes according to a preset time length, and controlling the on-off of the intermediate relay to supply the direct current voltages with different voltage amplitudes to the display module according to a preset switching time interval.
3. The display module test tool of claim 1, further comprising an indicator light module, wherein the indicator light module is used for making corresponding indication according to the working state of the voltage converter.
4. The display module testing tool of any one of claims 1-3, further comprising a monitoring module for monitoring display state information of the display module during a testing process.
5. The display module testing tool of any one of claims 1-3, further comprising a temperature sensor for collecting temperature information of an environment where the display module is located during a testing process.
6. A testing method based on the display module testing tool of any one of claims 1-5, characterized by comprising the following steps:
providing a test voltage for a display module to be tested according to a preset voltage supply strategy;
acquiring display state information of the display module under the current test voltage;
and judging the display performance of the display module according to the display state information of the display module under the current test voltage.
7. The method according to claim 6, wherein the providing a test voltage to the display module to be tested according to a preset voltage supply strategy comprises:
determining two direct current voltages with different voltage amplitudes according to a preset multiple of the rated voltage of the display module;
and periodically outputting the rated voltage and the two direct current voltages with different voltage amplitudes according to a preset time length, and controlling the rated voltage and the two direct current voltages with different voltage amplitudes to be supplied to the display module according to a preset switching time interval.
8. The test method according to claim 7, wherein the predetermined time period is 5s-15s, and the switching time interval is 2s-8 s.
9. The test method according to claim 7, wherein the two DC voltages with different voltage amplitudes are respectively 0.86-0.94 times and 1.06-1.10 times of the rated voltage of the display module.
10. The test method according to any one of claims 6-9, wherein the method further comprises: the temperature information of the environment where the display module is located in the testing process is collected, and the testing environment temperature is controlled according to the temperature information so as to keep the testing environment at the preset testing temperature.
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| CN202010417807.0A CN111579903A (en) | 2020-05-18 | 2020-05-18 | Display module testing tool and testing method |
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Application publication date: 20200825 |
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