We live around technology. There are many electrical items or things we surround ourselves with but we don’t know about the internal parts of them. And sometimes it is a bit difficult for students to understand it. Here you know the two important things with their differences.
TN vs PVA
The main difference between TN and PVA is that TN is a twisted nematic common type of display in LCD that consists of nematic liquid display in liquid crystal display. PVA is patterned vertical alignment is a variant of MVA(multi-domain vertical alignment). It is found on the LCD screen which provides the highest contrast. It acts as a degree of polarisation monitor.
Twisted nematic is the main technology part that makes liquid crystal display (LCD) practical. We are aware of cells and batteries so TN cells use low voltage batteries. It is said that it is responsible for fast pixel responses. Simply, it is a type of LCD that plays a very vital role in LCD.
Patterned vertical alignment (PVA) is used for contrast ratio and it is independent of MVA (multi-domain vertical alignment. It is characterized by pixels that use liquid organic material in LCD. As you all are aware of technological things and there are uncountable display devices. And each HD and UHD all use liquid material.
Comparison Table Between TV and PVA
| Parameters of Comparison | TN | PVA |
| Power consumption | TN LCDs consume very little power | PVA LCDs consume more power. |
| Response time. | TN LCD takes a low response time. | PVA takes the longest response time. |
| Viewing angles | TN LCD Panel has the worst viewing angle. | PVA LCD panels have a better viewing angle than TN. |
| Brightness | TN LCD has very low brightness. | PVA LCD has a very good brightness quality. |
| Best use | Used in gaming applications and animation. | It is used in documentation. |
What is TN?
Before understanding twisted nematic, let’s understand it terms by term. We know the chemical formula of water H2O, in this formula all three particles were included which are water, liquid, solid. In this liquid state is isotropic, solid-state is anisotropic. It is the state between liquid and crystal.
So a nematic liquid crystal is characterized by molecules that maintain the same direction. There are many phases but for now understanding, we understood the nematic phase. We also know the basic terms like cells and electrodes. By knowing the working of TN we understand it.
There are two polarizers present with transparent electrodes in them. Chemical used in that is indium tin oxide and thin liquid crystal sandwiched between electrodes. We named it TN because the display twists 90 degrees. The polarization process occurs in it. Here we don’t understand the deep working of TN but it depends on the voltage when it is on working is on and when it is off by us they stop their works.
There are many advantages of TN like the material used for construction of it at low cost. It is sunlight readable. There are also disadvantages like they provide low contrast, limited multiplexing. Usually, TN value is high on the market. Because it is easy to construct, mostly used in big industries.
In simple words, we can say that twisted nematic is a thin layer of liquid crystal which was found in the year 1970s used in many daily purpose things like computers, digital calculators and watches, etc.
What is PVA?
In this era, everyone knows what liquid crystal displays. Now it’s become a homie thing most people use. Probably many people are aware and see the LCD. Because it’s a science era and we are surrounded with computers, monitors, laptops, smart appliances, etc.
There are many LCD and their types because technology is vast. Here we understand one type of technology of LCD i.e. patterned vertical alignment. It is named vertically because pixels are vertically aligned in it. We know Whether it is HD, UHD, and LCD they use liquid crystal pixels.
Liquid pixels work vertically in the glass substrate on which they are placed. When our LCD pixels are placed in a perpendicular direction in the substrate. When LCD is turned on voltage causes them to change their position and then it is vertically oriented. When light is created by a backlight solution it can pass through liquid pixels and then produce images. It has a good capability of producing background music.
PVA is characterized by multi electrodes. Due to customer demand for a higher quality of image PVA demands in the market are increasing. Samsung announced PVA mode in 2004. Everything comes up with its pros and cons. It also has some. But PVA has more advantages and fewer disadvantages.
Hope you get knowledge after reading this. PVA is the most trending technology, meaning it is a new type of LCD. Liquid crystal set perpendicular by default by when voltage is on by the user it starts.
Main Differences Between TN and PVA
- Twisted nematic aligned 90 degrees whereas patterned vertical alignment aligned vertically in the glass substrate.
- Twisted panels are cheaper than other panels whereas patterned vertical alignment panels are expensive.
- Calibration of twisted nematic is very easy whereas calibration of PVA is complex.
- Colour contrast is not good for TN whereas Colour contrast is very good in the quality of PVA.
- Word consistency is not so good in TN panel LCD whereas in PVA word consistency is very good in the LCD panel.
- The refresh rate of TN is very high whereas the refresh rate of the PVA LCD Panel is very low.
Conclusion
After reading this hope you understand both the terms very well. They both are very important terms and it is very necessary to know them as they are important and trending technology physics terms.
But it is very important for undertaking these two topics. Your previous knowledge about the cell, voltage, and electrode is good. You can learn more about it. In this, I explained the basics of working with their differences. And yes many important parts are used in LCD but both these two play a very important role so it is good to know about it. Hope this helps.
References
- https://www.sciencedirect.com/science/article/pii/S1001074212602599
- https://journals.sagepub.com/doi/abs/10.1177/0021998312448497