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Reference.org
Lightguide display
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<p>A Lightguide display (also known as an edge-lit display) is an obsolete electronic mechanism which was used for displaying alphanumeric characters in electronic devices such as <a href="/facts/Calculator/eeLfRS8L">calculators</a>, <a href="/facts/Multimeter/GBMtfIRu">multimeters</a>, <a href="/facts/Laboratory_equipment/kqR3Vtx9">laboratory measurement instruments</a>, and entertainment machines such as <a href="/facts/Pinball/woBqmMfo">pinball</a> games. </p>