Pixel structure of electroluminescent display panel

A pixel structure of an electroluminescent display panel, comprising a first sub-pixel region and a second sub-pixel region, the pixel structure of the electroluminescent display panel comprising:

• a first anode, disposed in the first sub-pixel region;
• a second anode, disposed in the second sub-pixel region;
• a first organic light emitting layer, disposed in the first sub-pixel region and the second sub-pixel region, wherein the first organic light emitting layer is a single layered organic light emitting layer, and the first organic light emitting layer is substantially composed of one single organic light emitting material for the first sub-pixel region and the second sub-pixel region respectively generating a first primary color light and a second primary color light;
• a first cathode, disposed in the first sub-pixel region;
• and
• a second cathode, disposed in the second sub-pixel region, wherein a first micro cavity is formed between the first anode and the first cathode in the first sub-pixel region, and a second micro cavity is formed between the second anode and the second cathode in the second sub-pixel region, wherein a cavity length of the first micro cavity is shorter than a cavity length of the second micro cavity so as to enable the first sub-pixel region to provide the first primary color light and enable the second sub-pixel region to provide the second primary color light, and a peak wavelength of the second primary color light is larger than a peak wavelength of the first primary color light.