Fig. 1. Schematic diagram of the patterned COB RPD.

Fig. 2. Simulated OPI of a patterned COB with different V-shaped vertex angles, compared with that of a conventional COB. The inset shows the angular intensity distribution of the COB with a vertex angle of 120° as well as that of the conventional COB.

Fig. 3. Schematic diagrams of the ray dynamics for patterned COBs with different V-shaped vertex angles.

Fig. 4. Simulated output power and luminous flux of the V-COB RPD and conventional COB with different CCTs.

Fig. 5. Manufacturing process of the V-COB by (a) the Disco DAD322 dicing saw and (b) the finished V-shaped pattern.

Fig. 6. Measured output power of COBs under different drive currents. The inset shows the spectra of the COBs (350 mA).

Fig. 7. Finished LED COB device combined diced V-shaped pattern and remote phosphor.

Fig. 8. Measured luminous flux of COB RPDs as a function of drive current.