The flexible organic light-emitting devices (FOLED) is an important development direction in the next generation of display technology while it can be fabricated on the flexible substrate for flexible display application.

Based on the geometrical optics model,the optical characteristics of our FOLED with a structure of top reflecting mirror/organic material/bottom reflecting mirror/flexible substrate were discussed.

Some questions on application of bolting & concrete spraying support in the strata with large distortion, and aim at these questions, the flexible mesh is used to improve the flexibility of the spraying layer, and advance the tenacity and rift-proof of the spraying layer.

Electronic speckle pattern interferometry (ESPI) and finite element method (FEM) calculation have been used to investigate the thermal failure behaviors of the metal substrate in electronic packaging.