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Chinese Journal of Liquid Crystals and Displays

Chinese Journal of Liquid Crystals and Displays Chinese Journal of Liquid Crystals and Displays
  • Editor-in-Chief:Haicheng Guo
  • ISSN:1007-2780
  • eISSN:2097-3217
  • CN:22-1259/O4
  • Supervisor:Chinese Academy of Sciences
  • Sponsor:Changchun Institute of Optics, Fine Mechanics, and Physics (CIOMP), CAS, Liquid Crystal Branch, Chinese Physical Society, and Liquid Crystal Branch
  • Publication frequency:Monthly
  • Address:No.3888 Dong Nanhu Road, Changchun, Jilin, China 130033
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Volume 41 期 5，2026 2026年第41卷第5期

  • Material Physics

    LI Bowen, LIN Han, LI Jiale, JING Jiaqi, WAN Wentan, YUAN Conglong, HU Honglong, ZHENG Zhigang

    DOI：10.37188/CJLCD.2026-0071
    摘要：Flexibly tunable liquid crystal optical elements exhibit broad application in smart displays， soft robotics， and information encryption. Cholesteric liquid crystals（CLCs）， endowed with Bragg reflection characteristics and excellent external field responsiveness by their chiral helical structures， are becoming strong competitors in this field. However， conventional CLCs usually rely on single external field regulation with limited tunability， and their high fluidity poses challenges for effective encapsulation and stable application on flexible substrates. To address these issues， this paper designs a thermosensitive liquid crystal system incorporated with photoswitch， while introducing a paintable ink composed of ethyl cellulose and terpineol to optimize viscosity， thereby achieving synergistic regulation via dual external fields of temperature and light. Experimental results show that the thermosensitive system enables broadband regulation of the reflection wavelength from 420 nm to 1 000 nm within the temperature range of 37 ℃ to 29 ℃. Upon incorporation of photoswitch， dynamic tuning of the reflection wavelength from 450 nm to 700 nm is achieved by light irradiation at a specific temperature， where temperature and light synergistically determine the pitch variation. Systematic optimization of the mass ratio between CLC and the ink reveals that the 9∶1 ratio strikes the best balance between brushability and film-forming integrity. This study successfully demonstrates photothermal synergistic dynamic regulation of the Bragg reflection wavelength of CLCs on flexible substrates， enabling on-demand customization of specific reflection colors， thereby providing a novel photonic platform with multi-external-field responsiveness and facile flexible encapsulation for information anti-counterfeiting and smart display applications.  
    关键词：cholesteric liquid crystals;photothermal synergistic regulation;paintable ink;structural color;flexible optical applications   
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    ZHANG Yanqing, ZHAO Jie, YU Ping, HE Zemin, MIAO Zongcheng

    DOI：10.37188/CJLCD.2026-0032
    摘要：As innovative photoelectric composites characterized by unique microphase-separated morphologies， polymer-dispersed liquid crystals（PDLCs） eliminate the need for polarizers and overcome the inherent reliance of traditional liquid crystal devices on rigid cell structures. To address the critical challenges of high driving voltages and substantial electro-optical losses in current PDLCs， this review systematically summarizes the recent advances and underlying regulatory mechanisms of PDLCs incorporating polyhedral oligomeric silsesquioxane （POSS）-based monomers （POSS-SH and KH570-POSS） and their nanocomposite doping systems. Particular attention is devoted to elucidating how the incorporation of POSS monomers and nanofillers modulates the phase separation process， polymer network morphology， liquid crystal droplet size/orientation， and interfacial anchoring. Furthermore， the intrinsic structure-property correlations between these microscopic structural evolutions and macroscopic electro-optical performances—specifically driving voltage， contrast ratio， and optical loss—are comprehensively established. The findings demonstrate that the introduction of the unique cage-like POSS structure effectively optimizes the phase-separated polymer network， thereby significantly reducing the driving voltage and enhancing the contrast ratio. By deepening the theoretical understanding of performance modulation from the perspectives of microscopic morphological evolution and interfacial interactions， this review provides critical insights for the future design of high-performance flexible smart windows and advanced optoelectronic devices.  
    关键词：Polymer dispersion liquid crystal;polyhedral oligosasiloxane;driving voltage;contrast ratio   
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  • Device Physics and Device Preparation

    SUN Haifeng, ZHU Kang, LIU Jiale, PENG Zenghui, SUN Jingwei, YAO Lishuang

    DOI：10.37188/CJLCD.2026-0066
    摘要：Liquid crystal（LC） display technology maintains a dominant position in the panel market due to its mature manufacturing processes and superior cost-effectiveness. However， its response speed is still a critical factor restricting high-speed dynamic displays and optical modulation. While overdriving（OD） techniques can effectively shorten response times， they are frequently accompanied by the optical bounce （OB） phenomenon in the response curve， which severely degrades the quality of high-speed and high-precision displays. Based on Frank’s elasticity theory and the Ericksen-Leslie hydrodynamic equations， this study thoroughly elucidates the formation mechanism of the OB phenomenon by analyzing the dynamic response process of the LC molecular director under overdrive conditions. It is revealed that the overdrive voltage induces a spatially non-uniform distribution of molecular rotational velocities within the LC layer； the rotational velocity difference between the molecules in the bulk layer and those near the substrates triggers the OB phenomenon. Based on this mechanism， we propose an optimization technique to suppress OB by precisely modulating the overdrive voltage amplitude. Experiments using a 10 μm anti-parallel aligned LC-BYE7 nematic LC device were conducted to verify the simulation results. The results demonstrate that optimizing the overdrive voltage effectively mitigates the internal rotational velocity difference， reducing the depth of the OB by up to 57.2% and decreasing the response time by 18 ms， thereby effectively improving display performance. The method proposed in this study not only validates the accuracy of the theoretical model but also provides a technically viable pathway with practical engineering value for the application of LC devices in fields such as high-quality dynamic displays and rapid wavefront modulation.  
    关键词：overdrive technology;optical bounce;director;response curve   
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    ZHAO Zhuoran, LIU Zhiqiang, YE Mao

    DOI：10.37188/CJLCD.2026-0047
    摘要：In order to solve the problem that the bandwidth of the outer zone of traditional Fresnel liquid crystal lens decreases sharply with the increase of the number of zones， which leads to the decrease of optical quality and the limitation of effective aperture， this study proposes a concentric ring Fresnel liquid crystal lens structure which uses interdigital electrode structure to independently control the driving voltage of Fresnel zone and then control the bandwidth of Fresnel zone， in order to broaden the bandwidth of the outer zone. Firstly， the driving voltage is limited in the linear response region of liquid crystal， and the driving voltage of each ring zone satisfies the derivative continuity condition through theoretical calculation to form a parabolic voltage distribution. Subsequently， a liquid crystal lens with an aperture of 2 mm， a liquid crystal layer thickness of 30 μm and three Fresnel zones （bandwidths of 0.4 mm， 0.3 mm and 0.3 mm） was fabricated. Compared with the traditional concentric ring design with maximum power， the outer zone increased by 5 μm and 73 μm respectively. Then， the polarization interference optical path is used to collect interference fringes and extract phase information. Experiments show that the goodness of fit of lens phase distribution and parabola is more than 99%， the maximum phase variation of positive and negative lenses is 20.9π and 22π， which is highly consistent with the theoretical reference value of 21.8π， and the power can be continuously adjusted in the range of -9.7~10.1 D， and it is approximately linear with the driving voltage difference. In addition， the imaging performance of the designed Fresnel liquid crystal lens is tested and evaluated. Based on ISO12233 resolution plate， the MTF50 value is 0.151 cycles/pixel，which is higher than that of Fresnel liquid crystal lens （0.132 cycles/pixel） designed by traditional formula and driven by double bus voltage. This result proves that increasing the bandwidth of Fresnel zone on the outer layer of the lens can effectively improve its optical imaging quality. The experimental results of zoom imaging also show that the liquid crystal lens has outstanding zoom ability. This design effectively realizes the expansion of the outer ring bandwidth and the parabolic phase distribution with high quality.  
    关键词：optical devices;liquid crystal Fresnel lens;electrode structure;phase distribution   
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