DENO LED Lighting

FPCB Technology — 9-Layer Structure, 2oz Copper | DENO LED

A Flexible PCB (FPCB) is the conductive backbone of every LED strip — a multilayer laminate of polyimide, adhesive, copper foil, coverlay and surface finish. DENO produces FPCB in-house with a 9-layer stack featuring 35 μm + 70 μm = 105 μm 99.9% electrolytic copper, ±10 μm lithographic trace accuracy, and integrated thermal-spread design. This delivers halved voltage drop, lower LED junction temperatures, and the dimensional precision needed for high-density SOB packaging.

Frequently asked questions

What is an FPCB?

FPCB stands for Flexible Printed Circuit Board — a thin, bendable multilayer laminate that carries copper conductive traces between a polyimide substrate and a coverlay. In LED strips, the FPCB is what allows the strip to bend, conform to curved surfaces, and be cut to length while distributing current to every LED.

How many layers are in a DENO FPCB?

DENO uses a 9-layer FPCB stack: bottom coverlay, adhesive, bottom copper (70 μm electroplated), adhesive, polyimide core, adhesive, top copper (35 μm), adhesive, top coverlay with white solder mask. The interactive cross-section diagram on this page shows each layer in scale.

What copper weight (oz) does DENO use?

DENO LED strip FPCB uses 1 oz top + 2 oz bottom = 3 oz total (35 μm + 70 μm = 105 μm). Standard market FPCB typically uses 0.5 oz + 0.5 oz = 1 oz total (50 μm) — DENO's copper is +110% conductive capacity vs standard, halving voltage drop per metre.

Why does FPCB copper thickness affect LED brightness?

Voltage drop along the strip follows V = I·R, where R increases with length and decreases with copper cross-section. Thinner copper causes more voltage loss, so LEDs at the far end of the strip receive lower voltage and appear dimmer. DENO's 105 μm copper keeps voltage stable, ensuring the last LED is as bright as the first across 10 m+ single-feed runs.

Does FPCB affect LED thermal performance?

Yes — significantly. Copper is the primary thermal conductor in an LED strip, spreading heat away from the chip junction to the surrounding environment. DENO's 105 μm copper acts as a high-capacity thermal spreader, lowering junction temperature by 5–10 °C versus 50 μm strips and slowing phosphor/chip lumen depreciation across the warranty period.