Next-generation displays (OLED/Mini-LED/Micro-LED) Evaluation and analysis for quality defectsEvaluation and analysis example 1. Gradient Mura 2. Individual differences of subpixel 4. Color mixture (light leaking from bank material) 6. High precision and speed measurement in production line 7. Organic EL display standard

Introduction The organic EL displays are growing as a next-generation displays, but also Micro LED display, Quantum dot display have been developed actively. Existing LED that wavelength is from 300 to 350 μm level have already spread to the market as digital signage displays. By miniaturizing LED chips to 100 - 200 μm level (Mini LED), under 100μm level or nm level, the displays with performance superior to LCD and OLED displays are also active developed by many research institutes and companies. These are also said most suitable devices for new application to project the image into the air...

•Spectral comparison of OLED each subpixels Fig.8 OLED subpixels Red emitting •Spectral comparison of Micro-LED each subpixels Along with the miniaturization of subpixels, the demand for pixel level measurement is increasing. Looking at Fig.16, it turns out there is a difference in spectroscopy of the OLED pixel. This is caused by the difference in film thickness and film quality distribution, and film thickness and film quality are caused by evaporation or metal mask misalignment. In order to satisfy the requirement for evaluation of sub-pixel in-plane irregularity, it can be evaluated using...

4. Color mixture (light leaking from bank OLED layer The general bank material of OLED is currently a transparent type for reducing outgas, and leaking light G R B and reflection due to light passing through a bank defect or a bank are occurring(Fig.22). For example, Bank material when only red (R) is displayed, light leaks to neighboring subpixel and green (G) and blue (B) also will emit TFT array light. Fig. 23 shows the luminance (pseudo color) with a general 2D luminance meter (XYZ filter method) Glass when only the emission of red (R), but it can only distinguish red (R) emission. Fig.22...

When the OLED display has been lit for a given length of time, even if switching to the next screen, the previous image will remain in a slightly displayed state. After displaying gray on a screen, black and white image is displayed for 10 seconds, and when it is evaluated how long the residual image existed after returning to gray again on the screen, it took about 2 minutes to return to the original gray image(Fig.40, 41). In order to evaluate the fluctuation of the residual image by sampling inspection of quality control etc., it is necessary to have a measuring instrument that can be measured...

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