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A Non-light Bleeding Illuminated Capacitive Button Assembly Disclosure Number: IPCOM000035628D
Publication Date: 2005-Jan-27

Publishing Venue

The Prior Art Database

Related People

Chris Silk


Light bleeding is when the light of one illuminated button area leaks into a neighboring button area. Illuminated, capacitive touch pads available through Synaptics usually consist of a single light guide that covers the entire input area of the touch pad. (The touch pad often includes a printed circuit board (PCB) with sensor electrodes and circuitry.) The light guide can be a thin, transparent plate that is illuminated by side firing LED's. Occasionally there is a desire for unconnected, individual button areas to be illuminated using a single light guide. This desired design usually has the undesirable 'light bleeding' effect. The design described in this document uses several light panels to illuminate individual button areas. Using methods such as Global Lighting Technology's (GLT) MicroLens(TM) technology also enables each panel can have large logos and text introduced.