Patent ID: 8575603

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