16.4: Bandwidth effect correction used for wide color gamut display measurement

Abstract

With the development of display technology, several new displays have attracted much attention such as OLED display, QLED display, Laser display and Mini/MicroLED display. Displays with high brightness, wide color gamut, high efficiency and long lifetime are our ultimate goal. Defect inspections and color measurements are important for us to evaluate display quality. To obtain wide color gamut, we usually use narrow spectral bandwidth light source. However, it's not easy for traditional color camera or filter camera to measure narrow bandwidth light source because the accuracy is limited. In this paper, we simulate color measurement accuracy by color camera and filter camera. We analyze the influence of bandwidth effect on the color measurement and carry out bandwidth effect correction method. With the correction, the measurement accuracy improves obviously. In addition, different displays with different spectral bandwidth have been measured to validate the corrections. The results show significant improvement in color measurement accuracy. Our bandwidth effect correction can be used for wide color gamut display measurement.

P‐6.4: Measurement for optical performance of flexible display based on imaging spectrometer

“…In our previous paper, we have analyzed the bandwidth effect for wide color gamut display measurement [4]. Currently, most of the displays adopt the color gamut standards such as BT.709, DCI-P3 and BT.2020.…”

“…The area of the triangle represents the color gamut range of every color gamut standard approximately. As analyzed in [4], theoretically, a spectrometer can measure the spectrum of a light source accurately. However, bandwidth of the spectrometer will result in different measurement result and a narrower bandwidth will contribute to measurement accuracy.…”