摘要
根据TN型液晶的工作原理和光学特性,提出了一种方波电压信号驱动的液晶电光调制实验方法,在此基础上,利用液晶电光效应实验仪,测量了扭曲向列相型液晶在不同频率、不同波形电压激励下的电光曲线和阈值电压,分析了激励电压频率、波形对电光曲线的阈值电压和陡度的影响.对加载于TN型液晶上的3 000 Hz方波实现了正弦波幅度调制,并分析了电光调制结果.此种电光调制方法可用于液晶材料对电信号响应特性的直观显示.
By studying the operation principle and optical characteristic of TN type liquid crystal, an experi- mental metho^t of liquid crystal electrooptic modulation derived by square wave voltage signal is proposed. Using liquid crystal electrooptie effect experimental apparatus,the electrooptic curve and threshold voltage of twisted ne- matic liquid crystal （TN-LC） excited by the voltages with different frequency and wave types, are measured. The influence of the frequency and wave types on the electrooptic curve, threshold and gradient,is analyzed. On the ba- sis of these,the sine wave modulation is realized by adding 3 000 Hz square wave to TN type liquid crystal, and the result of the electrooptic modulation is investigated. This method of electrooptic modulation can be used to the audio -visual display of electric signal response property of liquid crystal materials.
出处
《大学物理》
北大核心
2014年第1期46-50,共5页
College Physics
关键词
TN型液晶
电光效应
阈值电压
电光振幅调制
twisted nematic liquid crystal （TN-LC）
electrooptic effect
threshold voltage
electrooptic amplitude modulation
