Multi-channel detecting system for detecting optical performance of LED chip

A LED chip and optical performance technology, applied in the field of LED chip detection system, can solve the problems of weak magnetic field changes, low efficiency, high price, etc.

Inactive Publication Date: 2015-03-25
CENT TESTING INT GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The wireless probe card method needs to add additional sending and receiving circuits on the chip to realize the function detection of the chip, which is costly and inefficient
The laser SQUID method realizes the detection of the pn junction by non-contact measurement of the magnetic field distribution generated by the photocurrent, but due to the extremely weak change of the magnetic

Method used

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  • Multi-channel detecting system for detecting optical performance of LED chip
  • Multi-channel detecting system for detecting optical performance of LED chip
  • Multi-channel detecting system for detecting optical performance of LED chip

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Experimental program
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Embodiment Construction

[0021] Embodiments of the present invention will now be described with reference to the drawings.

[0022] Such as figure 1 As shown, a multi-channel detection system for the photoelectric performance of an LED chip provided by the present invention includes: a printed circuit board 1, a sample stage 2, a plurality of electrodes 3 and a point connection device: the sample stage 2 is arranged on the printed circuit board 1 The center of the LED chip is used to install the LED chip; the electrode 3 is arranged around the printed circuit board, such as figure 1 There are 8 electrodes shown in (also depending on demand, increase or decrease the number of electrodes); the point connection device includes a spot welder and a metal wire (not shown in the figure), and the spot welder is used to connect the metal wire The two ends of the LED are respectively connected with the electrodes and the LED chip.

[0023] Usually, a connecting plug 4 is installed on the printed circuit board...

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Abstract

A multi-channel detecting system for detecting the optical performance of an LED chip is characterized in that the system comprises a PCB, a sample table, a plurality of electrodes, a connecting plug, an electrical detecting unit, an optical detecting unit and a point connecting device; the sample table is arranged at the center of the PCB and is used for mounting the LED chip; the electrodes are arranged around the PCB; the connecting plug is electrically connected with the electrodes; the electrical detecting unit comprises a voltage meter, a current source, a switch matrix and an output plug, the voltage meter and the current source are electrically connected with the output plug through the switch matrix, and the switch matrix converts the electrical connection of all pins in the output plug; the point connecting device comprises a spot-welder and a metal wire, and the spot-welder is used for enabling the two ends of the metal wire to be connected with the electrodes and the LED chip respectively. The multi-channel detecting system is used for directly detecting the LED chip.

Description

technical field [0001] The invention relates to a detection system for LED chips, in particular to a multi-channel detection system for LED chips. Background technique [0002] Semiconductor light-emitting diodes (LEDs) have many new problems in quality evaluation and detection methods due to their small size, directional emission, high brightness, and PN junction electrical characteristics. Different applications determine the performance requirements of LED products. From the perspective of optical performance, LEDs used for display mainly include parameters such as brightness, viewing angle distribution, and color. LEDs used for general lighting pay more attention to parameters such as luminous flux, spatial distribution of light beams, color, and color rendering characteristics, while LEDs used in biological applications pay more attention to parameters such as biological effective radiation power and effective radiation illuminance. In addition, a light-emitting diode...

Claims

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Application Information

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IPC IPC(8): G01R31/26G01M11/02
Inventor 董宁刘攀超李波
Owner CENT TESTING INT GRP CO LTD
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