Environmental tests and reliability characterization of pixel-sized colloidal QDs for next-generation display technologies

Mehmet Parlak , Hatice Ilkben Ilban , Kivanc Karsli , Emre Unal , Hilmi Volkan Demir
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Abstract

This study investigates integrating pixelated colloidal quantum dot (QD) layers into LCDs to enhance color conversion and pixel-level enrichment for future display technologies. We developed miniature prototypes with pixel-sized QD color-converter layers seamlessly integrated into the backlight unit (BLU). The prototypes, featuring red- and green-emitting QD pixels with a single blue LED on glass substrates, underwent rigorous environmental tests such as Thermal Shock Test (TST), Thermal Cycle Test (TCT), High Temperature High Humidity Test (HHT), and Low Temperature Test (LTT). The assessment covered the uniformity of light, spectral radiance, and CIE color coordinates, revealing insights into the performance of the QD layers through the analysis of pre- and post-environmental tests. Despite a decrease in luminance, the QD layers exhibited resilience against rapid temperature variations, enduring thermal shock, and thermal cycle tests without cracking. However, high-temperature and high-humidity conditions revealed susceptibility. Low-temperature stress tests demonstrated stable color gamut coordinates with no discernible shifts. This research fills a notable gap in the existing literature by conducting comprehensive environmental tests on pixel-sized QD utilization in display technologies, providing valuable insights to enhance the stability, durability, and reliability of QD displays.

用于下一代显示技术的像素级胶体 QD 的环境测试和可靠性鉴定
本研究探讨将像素化胶体量子点(QD)层集成到液晶显示器中,以增强未来显示技术的色彩转换和像素级富集。我们开发了微型原型,将像素级量子点色彩转换层无缝集成到背光单元(BLU)中。这些原型产品在玻璃基板上配备了红色和绿色发光 QD 像素以及单个蓝色 LED,并经过了严格的环境测试,例如热冲击测试 (TST)、热循环测试 (TCT)、高温高湿测试 (HHT) 和低温测试 (LTT)。评估涵盖了光的均匀性、光谱辐射度和 CIE 色坐标,通过对环境测试前后的分析,揭示了 QD 层的性能。尽管亮度有所下降,但 QD 层在快速温度变化、承受热冲击和热循环测试中表现出了良好的适应性,没有出现裂纹。然而,高温和高湿度条件则显示出其敏感性。低温应力测试表明色域坐标稳定,没有明显偏移。这项研究填补了现有文献的一个显著空白,对显示技术中使用的像素级 QD 进行了全面的环境测试,为提高 QD 显示器的稳定性、耐用性和可靠性提供了宝贵的见解。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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