The invention is directed to compositions and methods for improving the physicomechanical and electro-optical properties of an electrophoretic or liquid crystal display and also to semi-finished or finished display panels with improved physicomechanical properties. The step of forming the internal light extracting layer includes: applying a coating solution onto the transparent substrate into a predetermined pattern, the coating solution containing a light scattering particle having an average particle size of 0. The flow adjusting mechanism exhibits little change of a flame length with the passage of time and has a long service life.