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Photoelectric testing method and device for LED devices

A technology for LED device and optoelectronic testing, applied in the direction of testing optical performance, etc., can solve the problems of affecting the accuracy of test results, affecting the display effect, long physical integration time, etc., to shorten the test time, improve the accuracy, and increase the luminous brightness. Effect

Inactive Publication Date: 2018-04-20
GUANGDONG VTRON TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

On the one hand, because the light intensity of the target light source is too weak, the physical integration time is too long and the test efficiency is low, making this type of product unable to meet the requirements of rapid spectroscopic testing for mass production; on the other hand, the light intensity of the target light source is too weak, which affects the test The accuracy of the results will directly affect the optical consistency of LED display products, and ultimately affect the display effect
Therefore, the conventional test scheme restricts the development of the currently advocated "low brightness and high gray" LED display products in terms of test efficiency and test accuracy.

Method used

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  • Photoelectric testing method and device for LED devices
  • Photoelectric testing method and device for LED devices

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Experimental program
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Effect test

Embodiment 1

[0033] Such as figure 1 Shown, a kind of photoelectric test method of LED device, comprises the following steps:

[0034] S1: Light up all or part of the LED chips of the LED device to be tested, test and record the luminescence data;

[0035] S2: Turn off one or more of the LED chips lit in step S1, test and record the luminescence data;

[0036] S3: Calculate the luminescence data of the one or more LED chips according to the luminescence data measured by S1 and S2;

[0037] S4: Compare the luminescence data of the one or more LED chips with the preset standard luminescence data to determine whether the one or more LED chips are qualified, and if the one or more LED chips are unqualified, determine The LED device to be tested is unqualified; if the one or more LED chips are qualified, repeat steps S1 to S4 to continue to determine whether the remaining LED chips of the LED device to be tested are qualified. If the chips are all qualified, it is judged that the LED device ...

Embodiment 2

[0047] The test sample in this embodiment is an LED COB module. In order to meet the requirements of a higher-resolution LED indoor display screen, the LED COB module has more obvious advantages. Based on this, this embodiment manufactures and tests a 2×2 LED COB module, which includes 4 groups of R, G, and B LED chips, such as Figure 5 shown. According to the above technical solution, N=12, n=1, 2, 3...12. Such as Figure 6 As shown, the specific test process is as follows:

[0048] 1) Light up the LED COB module to be tested, test and record the luminous data of the LED COB module D N ;

[0049] 2) Turn off the R1 LED chip in the LED COB module, light up the rest of the chips, test and record the luminous data D N-1 ; contrast luminescence data D N with D N-1 , Calculate the luminous data D of the R1 LED chip R1 ; will D R1 Test standard data D with preset R LED chip R0 For comparison, if D R1 If the test standard data is met, enter the next process, otherwise th...

Embodiment 3

[0056] On the basis of embodiment 2, adjust test procedure, test similar chip successively respectively, as Figure 7 As shown, the specific test process is as follows:

[0057] 1) Light up the R1~R4 LED chips in the LED COB module to test and record the luminous data of the LED COB module D R ;

[0058] 2) Turn off the R1 LED chip, turn on the R2~R4 LED chips, and the rest of the chips do not work, test and record the luminous data D N-1 , compared to the luminescence data D R with D N-1 , Calculate the luminous data D of the R1 LED chip R1 ; will D R1 Test standard data D with preset R LED chip R0 For comparison, if D R1 If the test standard data is met, enter the next process, otherwise the device is judged to be unqualified;

[0059] 3) Turn off the R2 LED chip, turn on the R1, R3, R4 LED chips, and the other chips do not work, test and record the luminous data D N-2 , compared to the luminescence data D R with D N-2 , Calculate the luminous data D of the R2 LED...

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Abstract

The invention discloses a photoelectric testing method and device of an LED device. The method comprises: lighting up all or part of the LED chips of the LED device to be tested, testing and recording luminous data; turning off one or more of the LED chips that are lit up. According to the measured luminescence data, calculate the luminescence data of the one or more LED chips; compare the luminescence data of the one or more LED chips with the preset standard luminescence data , to determine whether the one or more LED chips are qualified, and if the first one or more LED chips are unqualified, it is determined that the LED device is unqualified. The invention is suitable for photoelectric testing of small current LED devices, and has the advantages of short testing time, high accuracy and high efficiency.

Description

technical field [0001] The invention relates to the field of LED device testing, and more particularly, to a photoelectric testing method and device for LED devices. Background technique [0002] In recent years, with the further reduction of LED chip size, the development of packaging technology, the decline of price and the pursuit of high-definition display by customers, LED indoor display screens have developed rapidly. At present, the resolution of indoor LED displays has been greatly improved, but the brightness of LED chips is generally high, and viewers of LED displays are prone to problems such as glare and dizziness. In order to pursue a better display effect, the industry puts forward the concept of "low brightness and high gray" indoor LED display with small dot pitch. This requires higher resolution, color saturation and clarity for indoor displays, as well as LED display. The brightness of the display screen meets the viewing comfort level of human eyes. At p...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01M11/02
Inventor 孙天鹏李春辉董萌
Owner GUANGDONG VTRON TECH CO LTD