Pixelligent: Improved Light Extraction For OLED Displays

By Pixelligent Technologies
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The root cause of the light loss in the OLED device is the fact that the light is produced in a high index material and has to be transmitted to air with a low index (n0 = 1). When light travels from a material with a high refractive index (n) into a material with low refractive index, if the incident angle is larger than a critical angle, it experiences total internal reflection (TIR), which is the mechanism behind almost all light loss in the device. There are a number of approaches that can be used to improve light extraction, all of which involve some variation in redirecting high angle light so that it is not trapped by TIR. Read More

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