How to Test Light Guide Plate Transmittance | Transmittance meter

What instrument is used to measure the transmittance of the light guide plate-transmittance meter. Let's first understand what a light guide plate is and its material properties. Specifically, the light guide plate is a composite of acrylic sheets or PC boards and high-tech materials. Specifically, various engraving techniques (laser engraving, cross grid engraving, etc.) are used to print a light guiding point on an acrylic plate or a PC plate. Then a high-tech material which is high refractive index can achieve light guiding. The characteristic of the light guide plate is that the acrylic light absorbs the light emitted by the light and then the light is irradiated to the respective light guiding points through the advanced material. The reflected light spreads to all corners. Finally, it is emitted from the front side of the light guide plate.

It is not difficult to see that the light has been refracted and scattered multiple times inside the light guide plate by the characteristics of the light guide plate. Therefore, the transmittance meter designed by the ordinary point light source and the parallel light source cannot accurately detect the transmittance of the light guide plate. A light guide plate transmittance meter must adopt the diffuse transmission principle.

LS117 Light guide plate transmittance meter

For example, the Linshang LS117 light guide plate transmittance meter is an instrument that use the diffuse transmission principle. After passing through the light guide plate, the light will have a receiver that simulates the integrating sphere effect. The reason why the integrating sphere effect is mimicked is that the receiver of the integrating sphere effect can make the light source uniform. On the other hand, the integrating sphere effect can receive light more completely, avoiding the situation where light leaks or accepts part of the light.

Therefore, for the problem of what instrument to use for measuring the transmittance of the light guide plate. We recommend you to use the transmittance meter that adopt the diffuse transmission principle.

If you want to know about the lens transmittance meter, please read "How to Choose Light Transmittance Meter?"