Transmittance vs. applied voltage
Observed response curve on oscilloscope
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 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.
Specifications
| Item | Specifications |
| Semiconductor Laser | 0~3 mW, adjustable |
| Polarizer/Analyzer | 360° rotation, division 1° |
| LC Plate | TN-type, area 35mm × 80mm, 360° horizontal rotation, division 20° |
| LC Driving Voltage | 0 ~ 11 V, 60-120Hz |
| Voltmeter | 3-1/2 digit, 10 mV |
| Photodetector | high speed |
| Current meter | 3-1/2 digit, 10 μA |
Part List
| Description | Qty |
| Electric control unit | 1 |
| Diode laser | 1 |
| Photo receiver | 1 |
| LC plate | 1 |
| Polarizer | 2 |
| Optical bench | 1 |
| BNC cable | 2 |
| Manual | 1 |
Transmittance vs. applied voltage
Observed response curve on oscilloscope
