Polarizing film is an optical component that can separate the vibration direction in natural light into two directions. Polarizers have applications in many fields, including displays, photography, optical instruments, etc.
In the optical path, polarizers can play the following roles:
Controlling the direction of light: Polarizers can change the polarization direction of light, thereby controlling the direction of light. For example, in liquid crystal displays, polarizers can polarize the light emitted by the backlight and then change its polarization direction to achieve image display.
Control the intensity of light: Polarizers can absorb light in specific directions, thereby controlling the intensity of light. For example, in a solar mirror, polarizing film can absorb scattered light, thereby improving the clarity of the field of view.
Control the color of light: Polarizers can change the color of light. For example, in a colored polarizer, the polarizer can absorb light of a specific wavelength, resulting in the light appearing in a specific color.
Classification of Polarizers
According to the function of polarizing film, polarizing film can be divided into four types: transmissive, reflective, semi transmissive and semi reflective, and compensating.
Transmitting polarizer: After passing through the polarizer, the light maintains its original direction.
Reflective polarizer: Light is reflected after passing through the polarizer.
Semi transparent and semi reflective polarizing film: After passing through the polarizing film, light partially passes through and partially reflects.
Compensating polarizer: used to eliminate color distortion in LCD displays.
According to the dyeing method, polarizers can be divided into two types: iodine based and dye based.
Iodine polarizing film: It has optical properties of high transmittance and high polarization degree, but poor resistance to high temperature and high humidity.
Dye based polarizing film: It has good high temperature and humidity resistance, but its transmittance and polarization degree are not as good as iodine based polarizing film.
Application of polarizing film:
Polarizers have a wide range of applications in optical paths, such as:
LCD display: The polarizer in LCD display is a key component for achieving image display.
Sunglasses: Polarizers in sunglasses can improve field of view clarity and reduce glare.
3D glasses: The polarizing film in 3D glasses can achieve stereoscopic display.
Optical instruments: Polarizers in optical instruments can be used for optical measurement, optical design, etc.
