These are formed by bonding together separately etched thinboards.
这些是由连接在一起蚀刻薄木板分别。
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Flexible linear LED modules consist of surface-mounted LEDs on long, thin, flexible circuit boards that usually have self-adhesive packings and are packaged in reels.
As a result, LED makers went back to the drawing boards and today there are a number of different LED "solutions" that can light a letter as thin as 1"-3" for small letters.