Fig. 1. Model of LED flip chip

Fig. 2. Ray tracing picture of LED flip chip model

Fig. 3. Process diagram of laser hidden cutting dot. (a) Sapphire side wall after laser hidden cutting; (b) hidden tangent point model; (c) cross-section model of hidden tangent points

Fig. 4. Variation curves of LEE with number of hidden cutting layers

Fig. 5. LEE curves of F 1-F 4 samples

Fig. 6. LEE curves of C 1-C 6 samples

Fig. 7. Schematic of sample. (a) Combination sample; (b) uniform sample

Fig. 8. Variation curves of LEE with number of hidden cutting layers in empty space