APPARATUS AND METHOD FOR EVALUATING OPTICAL PROPERTIES OF LED AND METHOD FOR MANUFACTURING LED DEVICE
An optical property evaluation apparatus includes: a light conversion filter converting light emitted from an LED chip or a bare LED package, which is to be evaluated, into a different wavelength of light, and emitting a specific color of light; and an optical property measurement unit receiving the specific color of light emitted from the light conversion filter and measuring the optical properties of the received light.
1 . An optical property evaluation apparatus comprising:
a light conversion filter converting light emitted from an LED chip or a bare LED package, which is to be evaluated, into a different wavelength of light, and emitting a specific color of light; and
an optical property measurement unit receiving the specific color of light emitted from the light conversion filter and measuring the optical properties of the received light.
2 . The optical property evaluation apparatus of claim 1 , wherein the specific color of light emitted from the light conversion filter comprises white light.
3 . The optical property evaluation apparatus of claim 1 , wherein the light conversion filter comprises a phosphor filter which converts the light emitted from the LED chip or bare LED package into a different wavelength of light, and emits a specific color of light.
4 . The optical property evaluation apparatus of claim 3 , wherein the phosphor filter comprises a transparent substrate and a phosphor layer formed on the transparent substrate.
5 . The optical property evaluation apparatus of claim 3 , wherein the phosphor filter comprises a phosphor plate or a phosphor film.
6 . The optical property evaluation apparatus of claim 1 , wherein the light conversion filter is disposed in the vicinity of a light reception region of the optical property measurement unit for receiving the specific color of light.
7 . The optical property evaluation apparatus of claim 1 , wherein the light conversion filter is disposed adjacent to a light emission surface of the LED chip or bare LED package.
8 . The optical property evaluation apparatus of claim 1 , further comprising a voltage application unit applying a driving voltage to the LED chip or bare LED package which is to be evaluated.
9 . The optical property evaluation apparatus of claim 1 , further comprising a light concentration unit guiding the light emitted from the LED chip or bare LED package or the light emitted from the light conversion filter into a light reception region of the optical property measurement unit.
10 . The optical property evaluation apparatus of claim 9 , wherein the light concentration unit comprises one of an integrating sphere, a barrel-type light concentrator, and a bar-type light concentrator.
11 . The optical property evaluation apparatus of claim 10 , wherein the integrating sphere has an entrance opening for receiving light, and the light conversion filter is disposed at the entrance opening.
12 . The optical property evaluation apparatus of claim 10 , wherein the integrating sphere has an exit opening for transferring light to the light reception region of the optical property measurement unit, and the light conversion filter is disposed at the exit opening.
13 . The optical property evaluation apparatus of claim 1 , wherein the optical property measurement unit comprises a photodiode sensor measuring the light quality of the specific color of light emitted from the light conversion filter and a spectrometer measuring the spectrum of the specific color of light emitted from the light conversion filter.
14 . The optical property evaluation apparatus of claim 1 , wherein the optical property measurement unit measures the chromaticity of the specific color of light emitted from the light conversion filter.
15 . The optical property evaluation apparatus of claim 1 , wherein the optical property measurement unit comprises a spectrometer measuring the spectrum of the specific color of light emitted from the light conversion filter and a calculation unit calculating a chromaticity from the spectrum information obtained by the spectrometer.
16 . An optical property evaluation method comprising:
converting light emitted from an LED chip or bare LED package, which is to be evaluated, into a different wavelength of light through a light conversion filter, and emitting a specific color of light; and
receiving the specific color of light emitted from the light conversion filter, and measuring the optical properties of the received light.
17 . The optical property evaluation method of claim 16 , wherein the specific color of light emitted from the light conversion filter comprises white light.
18 . The optical property evaluation method of claim 16 , wherein the light emitted from the LED chip or bare LED package or the light emitted from the light conversion filter is guided into a light reception region for receiving the specific color of light through a light concentration unit.
19 . The optical property evaluation method of claim 16 , wherein the light emitted from the LED chip or bare LED package or the light emitted from the light conversion filter is guided into a light reception region for receiving the specific color of light through any one of an integrating sphere, a barrel-type light concentrator, and a bar-type light concentrator.
20 . The optical property evaluation method of claim 16 , wherein the measuring of the optical properties comprises measuring the light quantity and spectrum of the specific color of light emitted from the light conversion filter.
21 . The optical property evaluation method of claim 16 , wherein the measuring of the optical properties comprises measuring the chromaticity of the specific color of light emitted from the light conversion filter.
22 . A method for manufacturing an LED device, comprising:
measuring the optical properties of a specific color of light obtained by converting light emitted from an LED chip through a light conversion filter; and
calculating a mixing ratio of phosphor-containing resin to be applied to a resin application process depending on the measured optical properties of the specific color of light emitted from the light conversion filter, based on a preset correlation between the optical properties of the specific color of light emitted from the light conversion filter and the optical properties of the LED device emitting the specific color of light.
23 . The method of claim 22 , wherein the specific color of light emitted from the light conversion filter comprises white light.
24 . The method of claim 22 , further comprising dispensing the phosphor-containing resin prepared at the calculated mixing ratio around the LED chip.
25 . The method of claim 22 , wherein the measuring of the optical properties comprises measuring the chromaticity of the specific color of light, and
the calculating of the mixing ratio of phosphor-containing resin comprises calculating the mixing ratio of phosphor-containing resin to be applied to the resin application process depending on the measured chromaticity of the specific color of light emitted from the light conversion filter, based on the preset correlation between the chromaticity of the specific color of light emitted from the light conversion filter and the chromaticity of the LED device emitting the specific color of light.
26 . A method for manufacturing an LED device, comprising:
measuring the optical properties of a specific color of light obtained by converting light emitted from a plurality of LED chips through a light conversion filter;
classifying the plurality of LED chips into a plurality of ranks depending on the measured optical properties of the specific color of light emitted from the light conversion filter; and
calculating a mixing ratio of phosphor-containing resin corresponding to the LED chips classified into the same rank, based on a preset correlation between the optical properties of the specific color of light emitted from the light conversion filter and the optical properties of the LED device emitting the specific color of light.
27 . The method of claim 26 , wherein the specific color of light emitted from the light conversion filter comprises white light.
28 . The method of claim 26 , further comprising dispensing the phosphor-containing resin prepared at the calculated mixing ratio around the LED chips classified into the same rank.
29 . The method of claim 26 , wherein the measuring of the optical properties comprises measuring the chromaticities of the specific color of light,
the classifying of the plurality of LED chips comprises classifying the plurality of LED chips into a plurality of ranks depending on the measured chromaticities of the specific color of light, and
the calculating of the mixing ratio of phosphor-containing resin comprises calculating the mixing ratio of phosphor-containing resin to be applied to the resin application process depending on the ranks of the LED chips, based on the preset correlation between the chromaticity of the specific color of light emitted from the light conversion filter and the chromaticity of the LED device emitting the specific color of light.
30 . An optical property evaluation method comprising:
applying a voltage to a bare LED package which is to be evaluated such that the LED bare package emits light; and
receiving the light emitted from the bare LED package, and measuring the chromaticity of the received light.
31 . The optical property evaluation method of claim 30 , wherein the light emitted from the bare LED package is guided into a light reception region of an optical property measurement unit through a light concentration unit.
32 . A method for manufacturing an LED device, comprising:
preparing a bare LED package;
measuring the chromaticity of a specific color of light obtained by converting light emitted from the bare LED package through a light conversion filter; and
calculating a mixing ratio of phosphor-containing resin to be applied to a resin application process depending on the measured chromaticity of the specific color of light emitted from the light conversion filter, based on a preset correlation between the chromaticity of the specific color of light emitted from the light conversion filter and the chromaticity of the LED device emitting the specific color of light.
33 . The method of claim 32 , wherein the specific color of light emitted from the light conversion filter comprises white light.
34 . The method of claim 32 , further comprising dispensing the phosphor-containing resin prepared at the calculated mixing ratio around an LED chip mounted on the bare LED package.
35 . A method for manufacturing an LED device, comprising:
preparing a bare LED package;
measuring the chromaticity of light emitted from the bare LED package; and
calculating a mixing ratio of phosphor-containing resin to be applied to a resin application process depending on the measured chromaticity of the light emitted from the bare LED package, based on a preset correlation between the chromaticity of the light emitted from the bare LED package and the chromaticity of the LED device emitting a specific color of light.
36 . The method of claim 35 , wherein the specific color of light emitted from the LED device comprises white light.
37 . The method of claim 35 , further comprising dispensing the phosphor-containing resin prepared at the calculated mixing ratio around an LED chip mounted on the bare LED package.