Polarizing films are usually used for the front and back layers of the LCD. Place one of the polarizing films in parallel on top of the other, and the brightness of the LCD screen will be the brightest; if one of the polarizing films is placed vertically on top of the other, the LCD screen will appear almost black. Therefore, it can be judged that the optical characteristics of LCD, such as brightness and contrast, are largely affected by the characteristics of the polarizing film.
Viewing angle characteristic evaluation
The retardation film is used to compensate the retardation caused by the light passing through the LCD display. The use of this film can produce an LCD display that is equally clear whether viewed from the front or the side. By using technology that can accurately evaluate the viewing angle characteristics (phase difference, main axis, and transmission rate), not only can the phase difference film optimized for phase difference be designed, but also new functions that adapt to different types of LCD displays can be designed.