单向遮光的聚合物稳定扭曲向列相液晶器件
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Polymer-stabilized twisted nematic liquid crystal devices with unidirectional light-blocking
YANYunfei，LINRuolong，ZHOU Zihan，MAHongmei，SUNYubao （School of Sciences，Hebei University of Technology，Tianjin 3OO4OO，China）
Abstract： To effectively prevent light emission in a certain direction from affecting viewers，such as the reflections produced by automotive display screens on the front windshield，this paper proposes a polymerstabilized liquid crystal device that prevents light emission ina specific direction.This unidirectional lightblocking liquid crystal device is based on a twisted nematic （TN） structure. By applying an electric field， the liquid crystal director's profile in the liquid crystal layer is appropriately controlled. In this state， ultraviolet light is used to cure the polymer monomers dispersed in the liquid crystal，forming a stable polymer network that fixes the orientation of the liquid crystal molecules. When the electric field is removed andthepolarizer is adhered to，aunidirectional light-blocking effect is achieved，fulfilling the desired requirement. Experimental results show that the proposed unidirectional light-blocking device can prevent light from passing through at specific angles，with a maximum transmittance of 89% at the normal viewing angle. The double-layer structure significantly reduces light leakage at large angles while maintaining a maximum transmittance of 70% at the normal viewing angle，providing a better unidirectional lightblocking efect. This work demonstrates that polymer-stabilized twisted nematic liquid crystal devices can offerunidirectional light-blocking characteristics while maintaining high transmittance in the forward direction，making them highly suitable for special applications in personal electronic products，vehicle displays，and safety information terminals，thus possessing significant practical value.
Key words： polymer stabilized liquid crystal；unidirectional light-blocking；TN structure；vehicle display
1引言
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