Standard and method for testing LED display
Time:2018-10-25
Views:251
1 scope
This standard classifies the mechanical, optical, electrical and other main technical performance of LED display screen, and specifies the testing method strictly.
This standard is applicable to all kinds of LED display screens (hereinafter referred to as the display screens).
2. Normative reference documents
LED display manufacturer claims that the terms in the following documents have been incorporated into the terms of this standard by reference.Any reference to a date, subsequent amendments (excluding errata) or revisions thereof shall not apply to this standard.However, parties agreed under this section are encouraged to study the availability of the latest versions of these documents.For undated reference files, the latest version applies to this section.
Gb4208-1993 enclosure protection standard for electrical and electronic products
General specification for SJ/ t11141-xxxx LED display screen
3 grade
Test results were followed and the indicators were divided into three levels.
Grade A: basic indicators to be achieved.
Grade B: the index is higher than grade A.
Grade C: the index is higher than grade A and B.
4 test environment and test instruments
4.1 test environment
Except for special requirements, the test environment is as follows:
Temperature: 15 ℃ ~ 35 ℃;
Relative humidity: 40% ~ 80%;
Atmospheric pressure: 86kpa ~ 106kpa;
Power supply voltage: 220V + / - 10%, 50Hz + / - lHz.
4.2 test instruments and software
Color TV signal generator :S/N is greater than 52dB;
Color analyzer: accuracy > + + 5% (used for measuring brightness,
The same kind of instrument with optical properties such as chroma can also be used;
Vernier caliper: resolution 0.02mm;
Precision protractor: 2 °.
Thermometer: accuracy + / - 1 ℃;
Optical intensity meter: accuracy > 10%;
Illuminometer: more than + / - 10% accuracy;
Oscilloscope: 100MHz;
Steel ruler: longer than 1m;
Plug gauge: precision greater than 1/100mm;
Brightness discrimination testing software;
Grayscale test software;
Frame rate test software.
5 test methods
5.1 electric properties
5.1. L frame change frequency
A) definition
The frequency of image information update FHO
B) requirements
C) measurement
-- start the frame frequency test software and open four areas on the display: A1, A2, A3 and A4.The first frame shows a "" in region A1, the second frame shows a" zero "in region A2, the third frame shows a" pentier "in region A3, and the fourth frame shows a" zero "in region A4.The above four screens are a group, and from the fifth frame according to the rule of the display cycle;
-- the test software is displayed on the display screen. If the display screen has a complete circle in all four regions, the change frame frequency FH is equal to the computer frame frequency FF, that is, FH=Fr.
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