Optical Property Evaluation Technology

For developing the optical films that are so essential for LCDs.

Various kinds of film with unique optical properties, such as polarizing and retardation films, etc., are used in LCDs to help improve color and definition as screens become smaller and more compact. Polarizing films are optical films that make it possible for people to see the screens of LCDs. If such screens were removed from LCDs, it would be impossible to recognize letters or graphics.

The brightness and contrast of LCDs are greatly influenced by the properties of polarizing films.

Polarizing films are normally used in front of and behind LCDs. If two polarizing films are placed one on top of the other in parallel then the screen of the LCD will be at its brightest. If, however, they are placed on top of and perpendicular to each other, then the screen will look as though it is black. Therefore, the optical characteristics of LCDs, such as brightness and contrast, are greatly influenced by the properties of polarizing films.

Basic LCD Structure

Polarizing Film Function

Viewing Angle Characteristic Evaluation

Precision evaluation of the viewing angle of retardation film makes it possible to create LCDs that can be viewed clearly, even from an angle.

Retardation film compensates for the phase difference that occurs when light passes through an LCD panel. Utilizing this film makes it possible to produce LCDs with screens that can be seen equally clearly whether viewed from the front or from an oblique angle. By using technology that is able to precisely evaluate viewing angle characteristics (phase difference, principal axis and transmission rate) it is possible to design retardation films with optimized phase difference, and new functions to suit various kinds of LCDs.

Retardation film

Film viewing angle characteristics

Measuring viewing angle characteristics from various angles using a sensor

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