通过外场实现手性液晶选择性反射的动态调控是目前的重要研究方向之一。近年来人们发现了一种特殊的向列相——扭曲-弯曲向列相（Twist-bend Nematic，N_tb），其与手性分子的混合物在电场诱导下可以形成一种具有斜螺旋结构的新型胆甾相，称为倾斜螺旋胆甾相（Oblique Heliconical Cholesterics，Ch_OH）。不同于普通胆甾相的电场调制性能，Ch_OH的螺距在一定范围内随电场强度增大而减小，因此可以实现从紫外到近红外宽光谱范围的选择性反射。这一特性引起了研究人员的广泛关注，也使得Ch_OH液晶材料在全色反射显示器、智能窗户、可调谐滤波器、全息以及其他应用领域有巨大的应用潜力。本文在简述Ch_OH液晶的特征基础上，重点总结了近年来外场调控Ch_OH液晶以及聚合物复合Ch_OH液晶的研究进展，并对其未来发展趋势进行了展望。

Dynamic control of selective reflection of chiral liquid crystals (LCs) through the external field is one of the important research directions. In recent years, a special nematic phase, twist-bend nematic (N_tb), has been discovered, and a new type of oblique heliconical cholesteric phase (Ch_OH) can be formed by mixing N_tb mixture with chiral molecules under electric field induction. Different from the electric-field modulation performance of ordinary cholesteric phase, the pitch of Ch_OH decreases in a certain range with increasing electric field intensity, thus realizing the wide range switching of selective reflection from ultraviolet to near infrared spectra. This phenomenon caused the wide attention of the researchers, and it also makes the Ch_OH LCs material have great potential in reflective display, smart windows, tunable filters, holograms and other applications. On the basis of a brief introduction of the characteristics of Ch_OH LCs, this review paper focuses on the recent research progress of field-controlled Ch_OH LCs and polymer/Ch_OH LCs composites, and prospects their future development trends.