81‐3: Effects of Flexoelectricity and Ion on the Flicker of Fringe Field Switching Liquid Crystal Display

Jiang, Yingfei; Zhou, Xiaochen; Qin, Guangkui; Xu, Xiaoguang; Lee, Seung‐Hee; Yang, Deng‐Ke

doi:10.1002/sdtp.12124

Cited by 7 publications

(5 citation statements)

References 15 publications

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“…This further leads to the asymmetry of positive and negative half-cycle voltage, resulting in the change of transmittance and flicker issues [ 31 ]. (2) Flexo [ 32 , 33 , 34 , 35 , 36 ], flexoelectric effect refers to the phenomenon that liquid crystal molecules self-polarize and exhibit macroscopic dipole moment due to stretching and bending deformation under the action of an external electric field. In FFS mode, there is no strict horizontal electric field, but a vertical electric field is present, which will lead to the deformation of liquid crystal molecules and produce a spontaneous polarization electric field [ 37 , 38 , 39 ].…”

Section: Resultsmentioning

confidence: 99%

Negative Dielectric Anisotropy Liquid Crystal with Improved Photo-Stability, Anti-Flicker, and Transmittance for 8K Display Applications

Chen

Liu²,

Chen³

et al. 2022

Molecules

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Video systems such as 8K displays can provide a strong sense of presence and reality due to their extremely high resolution and wide field of view. However, high-resolution displays generally suffer from reduced transmittance, which requires the use of liquid crystals with high transmittance and high stability. In this study, negative dielectric anisotropy liquid crystal compositions with excellent photo-stability, anti-flicker capability, and high transmittance are developed, showing potential for 8K display applications. The stability of different types of negative dielectric anisotropy liquid crystal compounds is assessed under light, and the high photo-stability compounds are obtained. In addition, it is demonstrated that the flicker can be optimized from −17.6 to −47.0 by removing the compounds with a higher ion content and a larger deformation number and adding the compounds with a smaller deformation number in the negative dielectric anisotropy liquid crystal compositions. Combining with the evaluation of the factors affecting the response time, the negative dielectric anisotropy liquid crystal mixed H is designed with improved stability and flicker; thus, the response time was decreased to 9.5 ms, and the optical transmittance was 5.5% higher than that of MAT-09-1284 (for normal) and 3.1% higher than that of BY19-J01A (for 4K).

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Section: Resultsmentioning

confidence: 99%

Negative Dielectric Anisotropy Liquid Crystal with Improved Photo-Stability, Anti-Flicker, and Transmittance for 8K Display Applications

Chen

Liu²,

Chen³

et al. 2022

Molecules

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show abstract

“…In ADS mode, the flexoelectric effect is an effect in which the liquid crystal is deformed by an electric field, resulting in an additional dipole moment [3][4][5][6]. The polarization strength of the flexural electrical effect can be expressed by the following equation:…”

Section: Flexoelectric Effect Impact Factorsmentioning

confidence: 99%

36.2: ADS Display Mode Gaming TV compatible with G‐Sync

Chen,

Yang,

Zhang

et al. 2023

Symp Digest of Tech Papers

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This paper study the impact of pixel voltage leakage and liquid crystal flexoelectric effect on flicker with simulation and measurement method. The impact rule of pixel architecture, TFT voltage, electrode design, liquid crystal material, driving signal and other factors is obtained, and the key factors under different conditions are identified. The pixel design and liquid crystal scheme under different conditions are proposed, and a strategy of data voltage modulation at the blanking stage combined with frequency‐wise ACC brightness compensation is established to reduce flicker. Based on the proposed complete flicker optimization strategy, flicker lower than ‐50dB is achieved on 55/65/75 inch 4K gaming products when switching back and forth at 48/120Hz every 200ms, meeting the G‐Sync flicker standard.

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“…Flexoelectricity can be used for the reduction of power consumption in liquid crystal displays (LCDs). [2,3,[12][13][14][15][16][4][5][6][7][8][9][10][11] Unlike the piezoelectric effect results in a linear coupling between mechanical deformation and electric polarization in dielectric systems, flexoelectricity arises in mesogenic liquid crystal (LC) systems according to the spatial strain gradient. [17][18][19][20][21][22] A symmetric stress induces a symmetric response, as Curie's principle suggests.…”

Section: Introductionmentioning

confidence: 99%

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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81‐3: Effects of Flexoelectricity and Ion on the Flicker of Fringe Field Switching Liquid Crystal Display

Cited by 7 publications

References 15 publications

Negative Dielectric Anisotropy Liquid Crystal with Improved Photo-Stability, Anti-Flicker, and Transmittance for 8K Display Applications

Negative Dielectric Anisotropy Liquid Crystal with Improved Photo-Stability, Anti-Flicker, and Transmittance for 8K Display Applications

36.2: ADS Display Mode Gaming TV compatible with G‐Sync

Ultralow Power Consumption Liquid Crystal Display Retaining Superior Image Qualities

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