You often have visited an optical store, for buying a new set of sunglasses and might have come up with a couple of glasses that you found appealing to you. Besides, during this scenario, you might also have heard or been asked about the term “polarized lenses”. So, what does it mean actually? Well, for making a lens or screen polarized, a thin layer or you may call it a polarizing film is applied to them, which makes the vision more clear.
Nowadays, there has become a trend of polarized glasses and people prefer them out of their benefits. Polarized lenses are specialized with a thin film, that traps the sharp and intense reflected light and reduces discomfort and glare – making the vision clearer.
To be more clear, the application of polarized films on glasses not only resist the bright light but also sharpens the vision – which is even more suitable for people while driving in the day time. Sportspeople, drivers, fishermen and various other people are seen to give remarkable reviews about these lenses. People wearing a pair of polarized glasses can easily walk through the sharp, scorching, and brilliant sunlight and the coating of the film protects the eyes. Wearers of polarized sunglasses can see through the water’s surface.
There are many types of polarized films, aimed for different purposes – for instance: as the polarized smears are efficient for glasses, same as they are useful for LCD (Liquid Crystal Display) screens, making the colors more intense and letting the viewer enjoy the brighter image. Some of the types of these films used for different purposes are given below:
Linear Polarizer Film: these films are best at reducing glare due to light reflection. They are used in sunglasses, camera filters, and machine vision systems.
Circular Polarizer Film: These filters are excellent for their application in the camera, display, and sensors, where there is a need for a glare reduction and is also helpful in resolving an issue of sensitivity against linearly polarized light. They are also useful in applications of passive 3D.
LCD Polarizer Film: In LCD technology, the polarizing film is the fundamental component that makes images possible to display LCD screens.
Dye Type Polarizer Film: They are also called iodine-type polarizing film and are formed by using dichroic iodine to dye polyvinyl alcohol (PVA)-based film. They are extensively used in LCDs and have other applications as well. They perform cross transmittance against high brightness and maintains contrast ratio.
Reflective Polarizer Film: –In this mode of polarizer, for illuminating the display, ambient light is used – for example: sun light. It works akin to mirror. It reflects back the light being flashed on it, while blocks the one coming from behind. They are used in LCD displays. This is only applicable to situations where there is availability of ambient light source in abundance.
There are also Transflective Polarizer Film: This type of polarizers is composed of transmissive and reflective polarizer. In this mode, a backlight is used as to facilitate reading on display, when ambient light is not available.