Physics Lab Equipment

LEOI-35 Experimental System for LC Electro-Optic Effect

LEOI-35 Experimental System for LC Electro-Optic Effect

Features

  • Compact system

  • Low cost

  • Ample experimental content






Introduction

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 sample.

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.


Specifications

ItemSpecifications
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

DescriptionQty
Electric control unit1
Diode laser1
Photo receiver1
LC plate1
Polarizer2
Optical bench1
BNC cable2
Manual1


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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