Flexible LED filament bar

Abstract

The invention discloses a flexible LED filament bar, comprising a strip-shaped flexible metal wiring board, two metal electrodes and a plurality of front-mounted LED chips, the strip-shaped flexible metal circuit board is composed of a strip-shaped flexible metal substrate and a printed circuit layer arranged on the front surface of the strip-shaped flexible metal substrate, two metal electrodes are one-to-one correspondingly mounted on both ends of a strip-shaped flexible metal substrate, the two metal electrodes are electrically connected to the printed circuit layer, a plurality of chip mounting regions are reserved on the front surface of the strip-shaped flexible metal substrate, At least one positive LED chip is bon to each chip mounting area, A plurality of wiring areas are arrangedon the printed wiring layer, The two chip electrodes of the LED chip are respectively electrically connected with two adjacent different wiring regions one by one in a longitudinal wiring mode so that all the LED chips are connected in series or in series and parallel, and phosphor glue is coated around all the LED chips and the strip-shaped flexible metal circuit board to form a phosphor glue layer. The advantage is low cost and no leakage current.

Description

technical field [0001] The invention relates to a filament, in particular to a flexible LED filament strip. Background technique [0002] A large number of flexible filament lamps for decorative lighting have appeared on the market. Flexible filament lamps generally use a flexible LED filament strip, which can be bent into various shapes, similar to traditional tungsten filaments, and has a good decorative effect. [0003] Existing flexible LED filament strips usually use a flexible circuit board, which is formed by etching a printed circuit layer on the flexible board; then LED flip chips are welded on the printed circuit layer to connect them. The reason why the existing flexible LED filament strips use LED flip chips instead of conventional wire bonding is to avoid gold wire breakage during the bending process. However, this also causes other technical problems: 1) Since only LED flip-chip, so the price of the existing flexible LED filament strip is higher; 2) When LED f...

AI Technical Summary

Problems solved by technology

The reason why the existing flexible LED filament strips use LED flip chips instead of conventional wire bonding is to avoid gold wire breakage during the bending process. However, this also causes other technical problems: 1) Since only LED flip-chip, so the price of the existing flexible LED filament strip is higher; 2) When LED flip-chip is welded to the printed circuit layer, because the electrode welding area of ​​the LED flip-chip itself is small, it is prone to leakage during welding. current, it is easy to cause LED flip chip damage

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