The present disclosure provides an OLED pixel unit, a method for producing the same, a display panel and a display apparatus. The OLED pixel unit includes an organic light emitting diode configured to emit a light within a wavelength range; and a photonic crystal array located at a light exit side of the organic light emitting diode, structural parameters of the photonic crystal array depending on a preset color of the OLED pixel unit. The light emitted from the OLED has a wavelength which is selected by the photonic crystal array such that the preset color is presented at the light exit side of the OLED. It can achieve high resolution over the conventional means due to the photonic crystal array having a machining size in nanometers. Thus, the resolution of the OLED pixel unit using the photonic crystal array can be improved significantly.