LED lights are primarily connected through the circuit board for display in many applications.
These boards can be custom done flex PCBs or standard FR4 rigid boards. Flex boards are often used to get the lights in the correct positioning as they can be adjusted during the bending and flexing process to fit virtually any design shape.
Modern LEDs, in general, are assembled to the board using surface mount technology, or SMT. The LEDs as well as all other SMT components are bonded directly to the pads so no holes are required in the circuit board.
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