Physics Lab Equipment

LEOI-35 Experimental System for LC Electro-Optic Effect

LEOI-35 Experimental System for LC Electro-Optic Effect


  • Compact system

  • Low cost

  • Ample experimental content


Liquid crystal (LC) is the fourth state of matter that has been well described in textbooks. It has found widespread applications in physics, chemistry, electronics, and life science. Among them, LC-based devices such as LC display, LC spatial light modulator, LC optical modulator, and LC optical switch are fabricated utilizing the electro-optic effect of LC materials. Therefore, it is important for students to understand the electro-optic effect of LC materials.


Using this apparatus, the following experiments can be conducted:


1. Understand the basic principle of LC display (TN-LCD).

2. Measure the response curve of LC specimen.

3. Calculate parameters such as threshold voltage (Vt) and saturation voltage (Vs).

4. Measure the transmittance of LC switch.

5. Observe transmittance change versus viewing angle.

The instruction manual contains experimental configurations, principles, step-by-step instructions, and examples of experiment results. Please click Experiment Theory and Contents to find more information about this apparatus.


Semiconductor Laser0~3 mW, adjustable
Polarizer/Analyzer360° rotation, division 1°
LC PlateTN-type, area 35mm × 80mm, 360° horizontal rotation, division 20°
LC Driving Voltage0 ~ 11 V, 60-120Hz
Voltmeter3-1/2 digit, 10 mV
Photodetectorhigh speed
Current meter3-1/2 digit, 10 μA

Part List

Electric control unit1
Diode laser1
Photo receiver1
LC plate1
Optical bench1
BNC cable2

Experimental System for LC Electro-Optic Effect.png

Transmittance vs. applied voltage 

LEOI-35 Experimental System-1.jpg

Observed response curve on oscilloscope

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