LED CLASSIFICATION METHOD, LED CLASSIFICATION DEVICE, AND RECORDING MEDIUM

摘要

An LED classification device classifies LEDs, the LEDs each including a combination of an LED element that emits a primary light and a phosphor that, upon excitation by the primary light, emits a secondary light having a longer wavelength than the primary light, the LEDs each emitting a combined light of the primary light and the secondary light, those ones of the LEDs whose primary lights having their chromaticities falling within a predetermined chromaticity range being classified as LEDs for use in a backlight of a liquid crystal display apparatus. The LED classification device calculates, for all of the LEDs to be classified, correction values for the chromaticities as obtained on the assumption that the primary lights have traveled through a color filter of the liquid crystal display apparatus, and correct chromaticities by subtracting the correction values from chromaticities obtained for all of the LEDs to be classified, respectively.

主权项

1. A method for classifying LEDs, the LEDs each including a combination of an LED element that emits a primary light and phosphor that, upon excitation by the primary light, emits a secondary light having a longer wavelength than the primary light, the LEDs each emitting a combined light of the primary light and the secondary light, those ones of the LEDs whose primary lights have their chromaticities falling within a predetermined chromaticity range being classified as LEDs for use in a backlight of a liquid crystal display apparatus,
the method comprising: a chromaticity correcting step of calculating, for all of the LEDs to be classified, correction values for the chromaticities as based on transmission of the primary lights through a color filter in the liquid crystal display apparatus, and of correcting the chromaticities as corrected chromaticities on a basis of the correction values for all of the LEDs to be classified; and a chromaticity rank classification step of classifying the LEDs according to chromaticity rank on a basis of the corrected chromaticities.