Recent progress in liquid crystal devices and materials of TFT-LCDs

Jung, Junho; Park, HanByeol; Jung, Ha Young; Jung, Se Eun; Kim, Seo Gyun; Kim, Tae Hyung; Lim, Young Jin; Ku, Bon-Cheol; Kim, MinSu; Lee, Seung Hee

doi:10.1080/15980316.2023.2281224

Cited by 4 publications

(2 citation statements)

References 87 publications

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“…Consequently, understanding these interactions and mechanisms is essential for achieving desirable LC alignment. − Both homeotropic and planar alignments of LCs have garnered significant attention in the fabrication of high-performance display devices, including TVs, smartphones, and other types of LC displays. − The surface in contact with LC molecules dictates LC alignment, with anisotropic surfaces influencing LC orientation. Various techniques, including rubbing, self-assembled monolayer, physicochemical methods, and anisotropic beam treatment, have been explored to achieve the desired uniform LC alignment. − …”

Section: Introductionmentioning

confidence: 99%

Stepwise Progression of Dye-Induced In Situ Photoalignment and Subsequent Stabilization for Noncontact Alignment of Liquid Crystals

Nasrollahi,

Rella,

Kumar

et al. 2024

ACS Appl. Mater. Interfaces

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Noncontact alignment of liquid crystals (LCs) is crucial for large-area and ultrahigh definition (UHD) display manufacturing. This research presents an innovative approach to the photoalignment of LCs, aiming to overcome challenges associated with uniformity and assembly in large-sized and UHD displays. Using homogeneously dissolved, nonionic azobenzene chromophores sensitive to both visible and UV light, we demonstrate an in situ stepwise progression of dye-induced LC alignment and subsequent stabilization using reactive mesogen (RM). Both dual-wavelength and single-wavelength approaches enable stepwise interfacial modifications for LC alignment and stabilization. The dye-induced LC alignment is rewritable, allowing for the creation of various patterns and gray-level alignments. The stability of the alignment is ensured through cross-linked RM layers, providing a robust and permanent solution for LC alignment without the need for delicate mechanical treatments. Importantly, this method addresses the challenges associated with conventional photoalignments, including various dye-induced approaches and high-energy photoalignment. The proposed method exhibits high-quality electro-optical switching, azimuthal anchoring strength, and stability against thermal, radiation, and ac-field stresses, making it a promising candidate for commercial mass production, especially in the fabrication of large-sized and UHD LC displays.

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Section: Introductionmentioning

confidence: 99%

Stepwise Progression of Dye-Induced In Situ Photoalignment and Subsequent Stabilization for Noncontact Alignment of Liquid Crystals

Nasrollahi,

Rella,

Kumar

et al. 2024

ACS Appl. Mater. Interfaces

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“…These properties make VA LCDs ideal for high-definition televisions, computer monitors, professional displays, and even medical imaging systems where image quality is paramount. Despite these advantages, VA LCDs face challenges, including slow response times and complex manufacturing processes, a subject of extensive study in recent literature [ 1 , 2 , 3 , 4 , 5 , 6 , 7 , 8 ]. Addressing these challenges, recent research has focused on the integration of polymer materials with liquid crystals, aiming to enhance the stability and performance of LCDs [ 9 , 10 , 11 , 12 , 13 , 14 ].…”

Section: Introductionmentioning

confidence: 99%

Tuning Electro-Optical Characteristics through Polymerization Monomer Content in PSVA Liquid Crystal Displays: Simulation and Experimentation

Zhang,

Lin,

Liu

et al. 2024

Polymers

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The enhancement of display performance and durability in polymer-stabilized vertical alignment liquid crystal and the liquid crystal are negative liquid crystals, which can be vertically aligned under the action of a vertical orientation layer and an electric field. Devices (PSVA LCDs) are crucial for advancing LCD technology. This study aims to investigate the electro-optical characteristics of PSVA LCDs by varying polymerization monomer concentrations. Using both simulations via TechWiz LCD 3D and experimental methods, such as polymer-induced phase separation, we developed an optoelectronic testing framework to assess voltage transmittance and response times. In our main findings, we show that an increase in polymeric monomer concentration from 3% to 7% resulted in a 67% increase in threshold voltage and a 44% decrease in saturation voltage. The on-state response time increased by about a factor of three, while the off-state response time decreased by about a factor of three. The alignment of our simulation results with experimental data validates our methodology, offering the potential of simulation tools as a pivotal resource in the PSVA LCDs. The alignment of our simulation results with experimental data validates our methodology, offering the potential of simulation tools as a pivotal resource in the PSVA LCDs. These advancements promise significant improvements in PSVA LCD performance and durability.

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Ultralow Power Consumption Liquid Crystal Display Retaining Superior Image Qualities

Kim,

Lee,

Park

et al. 2024

Advanced Optical Materials

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Global energy policies have urged power consumption reductions for electronic devices. However, this is inconsistent with the users' need for enhanced device performance. In this work, converse flexoelectricity is used to reduce power consumption while maintaining the superior display image quality of liquid crystal display (LCD). The first 1 Hz‐refresh‐rate and flicker‐free fringe‐field switching (FFS) LCD for a 13.4‐inch laptop are reported. A noticeable brightness deviation is inevitable when driving voltage polarity is altered during low‐frequency driving, which is caused by the flexoelectric effect and voltage‐holding failure. The nature of the converse flexoelectric contribution of mesogenic systems with the optimum flexoelectric coefficients and molecular polarity, and developed materials based on findings is investigated. The quality of static images and videos at 1‐ and 10 Hz refresh rates, respectively, is maintained, and the measured power consumptions are reduced by 83% and 47% compared to that at a 60 Hz refresh rate, and minimal flicker level is measured by −68 dB. It is believed that this will serve as a new paradigm for energy consumption in electronic devices with superior display performance of FFS LCDs.

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Recent progress in liquid crystal devices and materials of TFT-LCDs

Cited by 4 publications

References 87 publications

Stepwise Progression of Dye-Induced In Situ Photoalignment and Subsequent Stabilization for Noncontact Alignment of Liquid Crystals

Stepwise Progression of Dye-Induced In Situ Photoalignment and Subsequent Stabilization for Noncontact Alignment of Liquid Crystals

Tuning Electro-Optical Characteristics through Polymerization Monomer Content in PSVA Liquid Crystal Displays: Simulation and Experimentation

Ultralow Power Consumption Liquid Crystal Display Retaining Superior Image Qualities

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