Structural design of LED packaging in terms of lumen reliability by a statistical method

The structural design for LED packaging is of great importance. S o far, the methods for LED packaging are mostly from the perspective of enhancing the emitted light's optical performance. In this paper, we proposed a statistical method for the structural design of LED packaging in terms of lumen reliability. Orthogonal experimental design was used in the determination of the experimental scheme. Optical simulations were conducted to calculate the optical power of LED package according to the scheme. Two traditional structural models were selected as objectives. Range and variance analyses were applied to investigate the significance of structural factors on the LED's light output before guiding the structural design. According to the analyses, it is suggested that the lens and silicone encapsulant can be combined as one and the quality of the heat slug's top surface should be enhanced pointedly. It is concluded that this method is useful for the development and design of new packaging structures from the perspective of reliability.