OPTICAL TOUCH SENSING STRUCTURE AND MANUFACTURING METHOD THEREOF
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United States of America Patent
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Issued Date -
May 2, 2013
app pub date -
Feb 24, 2012
filing date -
Oct 28, 2011
priority date (Note) -
Abandoned
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Abstract
An optical touch sensing structure includes a transparent substrate and a stacked transparent optical layer. The transparent substrate has an upper surface. The stacked transparent optical layer is disposed on the upper surface of the transparent substrate with a portion of the upper surface being exposed. The stacked transparent optical layer is formed by stacking at least one first transparent optical layer and at least one second transparent optical layer. The refractive index of the first transparent optical layer is greater than the refractive index of the second transparent optical layer. The stacked transparent optical layer is adapted to allow a visible light to pass through and has a rough surface. When an infrared light is incident to the stacked transparent optical layer, the infrared light is reflected by the stacked transparent optical layer and scattered by the rough surface.
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