In our lives, the optic film is everywhere, from wearing glasses, digital cameras, and other optical thin film applications to displaying precision and optical equipment, if there is no optic films technology as the basis for development, no progress will be made in modern communications, optoelectronics or lasers. An optical film is one or more layers of metal or dielectric film or a combination of these two kinds of film-coated or coated on an independent substrate or optical element to change the characteristics of light wave transmission, it includes reflection, transmission, scattering, absorption, polarization and phase change of light.
In general, the optic film is mainly divided into dry and wet processes. Dry means that no liquid is present in the process. The wet coating is a mixture of functional components into the liquid coating, with different processing methods coated on the substrate, drying, and curing into products. The application range of wet coating is larger than that of dry coating.
The optic film can be divided into antireflection film, reflection film, polarizing film, an alignment film, diffusion film, filter, compensation film, brightening film, shading film, and so on. The derivative types are optical window film, protective film, and so on.
Anti-reflection film, also called anti-reflection film, can reduce or eliminate the reflection of Lens, plane mirror, prism, and other surfaces, increase the transmission of these elements, and eliminate or reduce stray light systems.
There are two kinds of reflective films: metal reflective film and all-dielectric reflective film. The reflectivity of the optical surface can be increased by combining the two metal-dielectric reflective films.
The imaging of the liquid crystal display has to be done by polarized light, whose main function is to change non-polarized natural light into polarized light, into polarized light, plus the torsion properties of liquid crystal molecules, to achieve the control of light through or not, so as to improve the light transmittance and visual angle range, the formation of anti-glare and other functions.
The function of the alignment film is to guide the alignment of liquid crystal molecules on the evaporated glass substrate with a transparent conductive film and to print parallel grooves on ITO film with Pi coating and runner, the liquid crystal can lie horizontally in the groove according to the direction of the groove so that the liquid crystal can be arranged in the same direction.
The diffusion film is a key component of the TFT-LCD backlight module, providing a uniform surface light source for the liquid crystal display.
The color filter is an important part of the TFT-LCD backlight module, which is made of plastic or glass and a special dye.
The compensation principle of the compensation film makes the birefringence properties of liquid crystal molecules be compensated symmetrically.
The brightening film is the key component in the backlight module of TFT-LCD, also known as the concentrator, which integrates the function of the original concentrator with the diffusion function, the invention is beneficial to the downstream manufacturer to save the working procedure, simplify the backlight design, reduce the cost, and improve the brightness efficiency.
Shading film is mainly used in the backlight, a fixed, shading effect is also called shading film. Compared with the backlight used in TFT-LCD, the requirement for shading is higher.
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