Patent ID: 8847857

Claim:
A pixel structure of an electroluminescent display panel having a first sub-pixel region, a second sub-pixel region, and a third 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 third anode, disposed in the third sub-pixel region; a first organic light-emitting layer, disposed on the first anode and corresponding to the first sub-pixel region, wherein the first organic light-emitting layer comprises a first organic light-emitting material for generating a first primary color light; a second organic light-emitting layer, disposed on the second anode and the third anode, and corresponding to the second sub-pixel region and the third sub-pixel region, for generating a second primary color light in the second sub-pixel region and generating a third primary color light in the third sub-pixel region, wherein the first primary color light, the second primary color light, and the third primary color light have different spectra of wavelength; a first cathode, disposed on the first organic light-emitting layer and corresponding to the first sub-pixel region; a second cathode, disposed on the second organic light-emitting layer and corresponding to the second sub-pixel region; and a third cathode, disposed on the second organic light-emitting layer and corresponding to the third sub-pixel region; wherein a first micro cavity is formed between the first anode and the first cathode in the first sub-pixel region, a second micro cavity is formed between the second anode and the second cathode in the second sub-pixel region, and a third micro cavity is formed between the third anode and the third cathode in the third sub-pixel region, and the first micro cavity, the second micro cavity, and the third micro cavity have different cavity lengths.