Light emitting apparatus comprising multiple groups of LEDs each containing multiple LEDs
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United States of America Patent
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Jan 28, 1997
Grant Date -
N/A
app pub date -
Mar 10, 1995
filing date -
Mar 18, 1994
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A plurality of LEDs are divided into multiple groups with the LEDs in each group being connected in series and being driven by a single current source. A region to be illuminated is divided into many areas with no spacing between adjacent ones of the areas. The LEDs in each group are positioned in different areas such that each area includes many LEDs from different groups. If one of the current sources and/or one of the LEDs of one group breaks down, the broken current source and/or LED does not affect the current sources and/or LEDs of the other groups.
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