We demonstrate that the angular-dependence effect in blue emission top-emitting organic light-emitting diodes (TOLEDs) can be resolved in a very simple and effective way via introducing gratings and filling process. In this method, the shift of the peak emission wavelength with the viewing angle is successfully suppressed in TOLEDs. A desired emission pattern of approximately Lambertian is obtained. Moreover, we can observe almost the same current density and luminance in TOLEDs with and without gratings. Their maximal luminance are 10,776cd/m2 and 11,290cd/m2, respectively.