Example of optical measurement evaluation of Micro-LED Evaluation and analysis example © Individual variation evaluation of subpixels in cell planes © Unevenness evaluation in cell planes © Measurement of leakage light by mixing color of color conversion method © Roughness evaluation in subpixel plane Appendix / Glossary

Introduction As a next generation display following LCDs (LCDs) and OLEDs (OLEDs), the development of micro-LEDs, quantum dot (QD) displays, etc. is becoming popular. By miniating the chip size to less than 100 microns and nm levels compared to existing LEDs, many research institutes and companies are actively developing displays that have the performance of surpassing conventional LCDs and OLED displays. These devices are also ideal for new applications such as AR (augmented reality) / VR (virtual reality) / MR (mixed reality) / SR (alternative reality), automotive head-up displays (HUDs), micro...

Dominant Wavelength Peak Wavelength In general, when evaluating the die of micro LEDs, there is an evaluation method for measuring the spectral spectrum and peak wavelength by installing an integrating sphere on the light emitting surface and measuring it using a spectrometer via optical fiber (Fig.4). However, because the die size is smaller, it is difficult to align, and it takes a very long time to evaluate because it is necessary to measure individually according to the emission point of each point. For example, if more than 10,000 die on a 6-inch wafer is inspected, the 2D spectroradiometer...

© Measurement of leakage light by mixing color of color conversion method Luminance Chromaticity Spectram 191 The color conversion method is a technology that displays RGB by changing the color that emits light by using QD and phosphor for micro-sized blue LEDs and UV-LEDs. When QD is used for the blue LED, blue light leaks through the gap between the particles of qD (Fig.14), so the output of blue light may be generated when G or R is emitted (Fig.15). This can cause color mixing and have a significant effect on the gamut (Fig.16). A 2D spectroradiometer SR-5100 series and microscopes are combined...

•Optical measurement unit The radiant flux that outputs light per unit time in all directions as the radiation amount that light spreads as an electromagnetic wave, the radiant intensity that outputs light emitted per unit stereoscopic angle in a particular direction, and the radiant intensity that outputs per unit area are expressed as radiance. Radiance can be calculated from the accrual of the emission spectrum (spectral radiance). For physical radiation, the human eye is sensitive to brightness, and the amount of photometric value that takes into account its wavelength characteristics is...

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