Index Matching

Index Matching (IM)

As light passes from one material to another both reflection and refraction occur. As light passes through a medium, such as glass, it slows. The slowing and subsequent bending of part of the light and reflecting of part of the light diminishes images from the display before they reach the eye. The result is a decrease in brightness and contrast from the display.

To solve this problem, the materials through which the light is passing must have equal indices of refraction. The index of refraction is a mathematical measurement of the speed of light as it passes through the materials. Examples of materials found on displays are: protective glass, polycarbonate, touch panels, and others. Equalizing the indices of refraction is called Index Matching.

We specialize in controlling light by employing a variety of processes and materials to equalize the indices of refraction. The processes and materials are tailored to meet our client’s specific applications and needs. For example, our Index Matching (IM)lamination is a cost-effective, multi-layer coating applied to a thin, hard-coated plastic substrate for acrylic and polycarbonate cover layers. IM lamination offers a significant reduction in reflective loss and is 25% harder than the standard display polarizer.

To contact our Display Systems Division please call 503.690.2460 during normal business hours (M-F, 8am-5pm PST).