Additional Functions of Polarizing Film

Additional Functions of Polarizing Film

Toward Even Higher Performance and Higher Quality

In order to control light, we need to employ various processing technologies corresponding to specific wavelengths, and components must be made so that they can maintain their designed performance capabilities under any operational environment. Our company develops and provides the market with light-controlling functions and components.

  • Clear Hard Coat & AG
  • AR/LR
  • Light Leakage Control
  • Wide View

Clear Hard Coat

Clear Hard Coat enhances surface hardness by applying a highly transparent and extremely hard coating agent to the polarizing film surface. It protects the film surface from external shocks and dents.

Comparison of resistance to scratching between an ordinary product (left) and a Clear Coat-applied product (right)

Comparison of resistance to scratching between an ordinary product (left) and a Clear Coat-applied product (right)


AG(Anti-glare)

AG (anti-glare) treatment makes displays easy to view by reducing glare from lighting, etc.
This treatment uses fine particles of silica mixed into the hard coating solution to scatter light and reduce glare from the light source. Hard coating also enhances the film's resistance to scratching.

Anti-glare controls glare of the background using fine particles which scatter and reflect external light.

Anti-glare controls glare of the background using fine particles which scatter and reflect external light.

 


Optical Characteristics of Our Products with AG and Clear Hard Coat Functions

Characteristics Without Treatment HC Z-9 Z-K1 Z-K3
Haze - - 10.9 5.5 7.0
60°glossiness 143.4 - 65.2 91.9 44.5
Image clearness※1 0.05mm - - 1.0 7.4 14.7
0.125mm - - 1.7 9.0 18.9
Pencil hardness B 2H 2H 2H 2H
Resistance to scratching X

※1:This is a criteria to judge the blot of the transmitted image. The higher the value, the finer the image can be compatible with. (JIS-K-7105)
The above values are for reference and do not represent guaranteed quality.


AR(Anti-Reflection)

AR (Anti-Reflection) is an additional function to reduce reflected light, which causes interference of light by coating multiple thin transparent films on the polarizing film surface. The use of coated films each with a different index of refraction and thinner by 1/4 or so than the visible light wavelength allows external light that has entered to be divided into light that is reflected on the film's surface and light that is transmitted and reflected from the inner side. These two types of light are out of phase by a half wavelength. This causes them to offset each other, thereby reducing the reflected light. As a result, it becomes possible to decrease reflection of light on the polarizing film surface.
Another feature of the AR function is the ability to increase transmittance while maintaining polarizing efficiency. With AR, it is possible to obtain a picture quality sharper than that of AG (Anti-Glare) thanks to less scattering of light. This in turn contributes to the improvement of contrast since the degradation in reproducibility of black (known in Japanese as “kuro-uki”) due to scattering of light is reduced. Therefore, use of AG and AR in well-balanced combination is advisable according to purpose.


Reflection of light is reduced by coating multiple thin transparent films on the polarizing film surface, which causes interference of light.

Higher effects can be produced by using AG and AR in well-balanced combination.

LR(Low-Reflection)

The LR (Low-Reflection) function lowers reflectance by applying a low-reflection material on the polarizing film surface. Compared with AR, LR treatment is possible at a lower cost.

Optical characteristics of Polatechno's products with AR/LR functions

Clear type

  Reflectance
(%)
Anti-
scratching
Fingerprint
elimination
ARG 0.6
LRC 1.0
HC(ref.) 4.0
表

*The above values are for reference and do not represent guaranteed quality.

Anti-Glare type

  Reflectance
(%)
Anti-
scratching
Fingerprint
elimination
K1LRC 2.0
K1(ref.) 4.3
表
*The above values are for reference and do not represent guaranteed quality.

It is possible to control the degradation in faithful reproducibility of black (known as “kuro-uki”) by adding an advanced light leakage control function to polarizing films used in an LCD panel. With little degradation even when subjected to high temperature conditions for a long period of time, our light leakage control function delivers the highest possible performance and durability. You can choose this function from the SKN or SHC Series.

Without light leakage control function

Without light leakage control function

With light leakage control function

With light leakage control function


How to calculate the light leakage control function  

Degree of light leakage = Average transmittance of 2, 4, 6 and 8 / Average transmittance of 1, 3, 5, 7 and 9

Effect and durability of light leakage control

  • Effectiveness test on light leakage control function
    Effectiveness test on light leakage control function
  • Test on time-dependent change of polarizing films with light leakage control function
    Change in Polarizing efficiency under 105℃-DRY
    Change in Polarizing efficiency under 80℃×90%

The Wide View function widens viewing angle by keeping refraction constant, controlling leakage of light and enhancing contrast in order to enable black contrast to be seen clearly from any angle. This function is indispensable to support the ever-increasing size of LCD displays. The Wide View function can be made available in integration with the polarizing film thanks to our proprietary coating and lamination technologies. Surface treatments such as AG and AR are also possible, as well as combination with the light leakage control function.

dummy

Structure and Characteristics

・Wide viewing angle is available by simply laminating the WV film to TFT-LCD.
・For surface treatment of polarizing films, you can opt for HC, AG, or AR.
・The light leakage control function is given.
Example: SHC-128W5L2


Effect