| 학회 | 한국재료학회 |
| 학술대회 | 2020년 가을 (11/18 ~ 11/20, 휘닉스 제주 섭지코지) |
| 권호 | 26권 1호 |
| 발표분야 | F. 광기능/디스플레이 재료 분과 |
| 제목 | Quantum Dot-Colored Liquid Crystal Display with Enhanced In-Cell Polarizer of Dichroic Dyes |
| 초록 | Recently, the advancement of the liquid crystal display (LCD) technology has greatly progressed toward the clear image quality together with the natural color. [1, 2]. According to the demand on the image quality, the emissive LCDs based on quantum dot (QD) color conversion have been attracted much attention owing to the narrow emission spectra, high quantum efficiency and easy tunability of emission spectra of the QDs. Several approaches have been reported for producing the QD-based emissive LCD, classified by the location of the QD patterns; Type A where the QD patterns are placed above the exit polarizer [3] and Type B where the QD patterns are below the entrance polarizer [4]. However, in both cases, an additional QD-patterned substrate or sheet is needed to attach onto the LC panel so that the luminous efficiency is inevitably sacrificed. In case of Type B, the lifetime of the QDs is deteriorated inherently by the continuous irradiation of the excitation backlight source. In this work, we proposed the QD-based emissive LCD with an enhanced in-cell polarizer composed of dichroic dyes. The QD layer was constructed on the inner surface of the top substrate and the in-cell polarizer was subsequently prepared on the QD layer to prevent the depolarization of the emission light and the degradation of the QDs. The in-cell polarizer was fabricated through the solution-processing of a dichroic dye solution and the following photo-alignment of the constituent dye molecules on the obliquely evaporated SiOx layer. The intensity of the incident light for exciting QDs was modulated by the phase retardation through the LC layer depending on the magnitude of the applied voltage. This leads directly to the modulation of the emission spectra of QDs with the color gamut extended to about 82 % of the BT.2020 standard. The architecture based on the in-cell polarizer will provide a simple and viable method of constructing the QD-based emissive LCD with high color purity in a cost-effective manner. |
| 저자 | ZHOU JING1, Sujie Kang1, Sin-Doo Lee2 |
| 소속 | 1Seoul National Univ., 2Seounl National Univ. |
| 키워드 | Quantum Dot; Emissive LCD; In-cell Polarizer; Dichroic Dye; Photoluminescence |
