Thesis Defense - Hatice İlkben İlban (MSEE)

Hatice İlkben İlban – M.Sc. Electrical and Electronics Engineering

Asst. Prof. Mehmet Parlak – Advisor

Date: 11.08.2023

Time: 14.00

Location: AB1 231

“ENVIRONMENTAL RELIABILITY CHARACTERIZATIONS AND ANALYSES OF PIXEL-SIZED COLLOIDAL QUANTUM DOTS FOR

NEXT-GENERATION DISPLAY TECHNOLOGIES”

Asst. Prof. Mehmet Parlak, Özyeğin University

Asst. Prof. Kadir Durak Özyeğin University

Asst. Prf. Kamil Çınar, Gebze Technical University

Abstract:

Display technologies have been evolving rapidly. Among them, liquid crystal displays (LCDs) presently dominate the market. Leveraging on the color technology enabled by colloidal quantum dots (QDs), LCDs secure their market position and continue evolving to incorporate QDs for color conversion and enrichment at the pixel level for the next-generation displays. In this thesis, to this end, pixelated QD layers have been investigated in LCD display settings. The backlight unit (BLU) of mini-prototypes was designed and demonstrated using pixel-sized QD layers, and the samples were studied before and after reliability tests. Initially, 5.6” prototypes with red- and green-emitting QD pixels on glass, each containing a single blue light-emitting diode (LED), were prepared to study the properties of QD layers after each environmental test. 25-point light uniformity distribution and 2D imaging colorimetry were performed before and after the reliability tests. Based on the results of variation between the pre-test and post-test measurements, QD layer behavior was evaluated.  Among the environmental conditions that affect the QD structures during these tests, our findings indicate: The thermal shock and thermal cycle tests showed that the quantum dot layers can withstand rapid changes in temperature without cracking or breaking. However, the high-temperature, high-humidity test showed that the quantum dot layers were sensitive to high humidity levels and high temperatures at the same time. The low-temperature test showed that the quantum dot layers have relatively good performance in cold environments. In light of our findings, QD pixelation holds great promise for next-generation LCD displays.

Bio:

Hatice Ilkben Ilban is a physics engineering graduate from Hacettepe University, Ankara, Turkey, where she earned her BSc degree in 2016. She began working as a Senior Optical System Design Engineer at Vestel Electronics Corp. in 2019. She has a passion for optical systems and cutting-edge technologies. Her work revolves around display systems, which focus on the intricate optical design of backlight systems and the implementation of novel display technologies. One of her major interests lies in the study and application of quantum dots in display technology.