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Method for sorting white light LED

A technology of LED chips and white light, applied in the field of LED lighting, can solve the problems of inconsistency in positions, inconsistencies in lenses, and inconsistency in light color space, etc., and achieve the effect of fewer sub-blocks, improved competitiveness, and slight color difference

Active Publication Date: 2009-04-22
HONGLI ZHIHUI GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007]3) Chip cutting geometry is inconsistent, resulting in inconsistent luminous brightness
[0009] 1) The difference in the ratio of phosphor powder and the amount of fluorescent glue leads to the inconsistency of light chromaticity space
[0010]2) The inconsistency of the properties of the lens (Lens), resulting in the spatial inconsistency of light color
[0011]3) The inconsistency of the optical properties of the outer sealant leads to the spatial inconsistency of light color
[0012]4) The inconsistency of the heat dissipation channel leads to different drifts of the LED emission spectrum due to different junction temperatures
[0013]3. Differences from the end of use: mainly manifested in the inconsistent position of each LED lamp in the drive circuit

Method used

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  • Method for sorting white light LED
  • Method for sorting white light LED
  • Method for sorting white light LED

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Such as figure 1 As shown, when sorting LED white light, the input voltage difference on the spectrometer is 0.10v, the brightness multiplier value is 1.19, the color difference value between the two points with the smallest color difference on the two curves is 0.0025uv, and the color temperature range is 2600K~2700K , make spectroscopic B block (such as figure 1 shown) and the coordinate table TB corresponding to the block:

[0042]

[0043]

[0044] Find the coordinate values ​​corresponding to the four vertices of all blocks within the range of block B, input them into the automatic spectrometer, the automatic spectrometer will measure and sort the LEDs, and assign the LEDs to different types, all white LEDs in block B will be sorted out.

Embodiment 2

[0046] Such as figure 1 As shown, when sorting LED white light, the input voltage difference on the spectrometer is 0.20v, the brightness multiplier value is 1.20, the color difference value between the two points with the smallest color difference on the two curves is 0.0035uv, and the color temperature range is 6500K~7000K , make a spectroscopic T block (such as figure 1 shown) and the corresponding coordinate table TT of the block:

[0047]

[0048]

[0049] Find the coordinates corresponding to the four vertices of all blocks within the T block, input them into the automatic spectrometer, the automatic spectrometer will measure and sort the LEDs, and assign the LEDs to different types, all the white LEDs in the T block will be sorted out.

Embodiment 3

[0051] Such as figure 1As shown, when sorting LED white light, the input voltage difference on the spectrometer is 0.30v, the brightness multiplier value is 1.30, the color difference value between the two points with the smallest color difference on the two curves is 0.0055uv, and the color temperature range is 9000K~1000K , create spectroscopic X block (such as figure 1 shown) and the coordinate table TX corresponding to the block:

[0052]

[0053] Find the coordinates corresponding to the four vertices of all blocks within the X block range, and input them into the fully automatic spectrometer, which will measure and sort the LEDs, and assign the LEDs to different types. All the white LEDs in the X block will be sorted out.

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Abstract

The invention discloses a method for sorting white light LED. The white light LED is formed by coating phosphor powder outside a blue light LED chip. The sorting method comprises the following steps: (1) the white light LEDs with same levels of voltage difference and brightness are sorted out; (2) different light split blocks on a chromatic diagram is defined, wherein the light split blocks consist of two curves parallel to a black track and two isotemperature lines with color temperature difference, and each block corresponds to one type of the LEDs; and (3) XY values of the LEDs on the chromatic diagram are measured, the corresponding light split blocks on the chromatic diagram according to the measured XY values are found out, coordinate values corresponding to four vertexes of all blocks within a block range are found out, the coordinate values into a full-automatic light split machine are inputted, and the LEDs by the fully-automatic light split machine are measured and sorted. The method is the most economic and convenient method for sorting light when the requirements can be met.

Description

technical field [0001] The invention relates to the field of LED lighting, in particular to a method for dividing individual differences in photoelectric properties of white LEDs. Background technique [0002] At present, because the luminous efficiency and brightness of white LEDs are getting higher and higher, and they have the advantages of power saving, environmental protection, small size, high color purity, firmness and long life, white LEDs are gradually replacing mercury-containing fluorescent tubes, etc. Traditional light sources are used in lighting, liquid crystal backlights, flat panel displays, car lights, etc. [0003] There are obvious individual differences in the electrical, optical and chromatic properties of white LEDs. There are many sources of these differences: [0004] 1. From the manufacturing process of the chip: [0005] 1) Epitaxial growth is inconsistent, and its external properties are mainly manifested in inconsistent peak (main) wavelength, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B07C5/34
Inventor 吴乾王跃飞胡康乐裴小明李国平
Owner HONGLI ZHIHUI GRP CO LTD
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