OLED technology is considered to have the following advantages with its self-emitting performance: light-thin,flexible,high contrast,fast response,high color gamut,wide view angle,low power consumption,and low cost, etc. After more than 10 years of large-scale application in mobile phones, although the scale has increased significantly, other applications have not made much progress. Through the performance analysis of mass production scheme and comparison with LCD, we find that on one hand, the expected OLED performance advantages have not been brought into full play in the product, on the other hand, the existing technical solutions have tended to be extreme in design and process. So there must be a big breakthrough in the design and process of OLED technology before it can be expanded to larger sizes and other applications.