Patent ID: 9608044
Date: 2017-03-28
CPC Classifications: H01L

Claim:
1. An organic light emitting device (OLED) display panel, one pixel of which comprising a first sub-pixel, a second sub-pixel and a third sub-pixel displaying different colors, wherein the OLED display panel sequentially comprises: a first light emitting layer covering at least two adjacent sub-pixels comprising the first sub-pixel; a charge blocking layer covering the second sub-pixel and the third sub-pixel; a second light emitting layer covering the first sub-pixel and the second sub-pixel; a third light emitting layer covering at least two adjacent sub-pixels comprising the third sub-pixel; wherein a lowest unoccupied molecular orbital (LUMO) energy level of a main material of the charge blocking layer, a LUMO energy level of a main light emitting material of the third light emitting layer, a LUMO energy level of a main light emitting material of the second light emitting layer and a LUMO energy level of a main light emitting material of the first light emitting layer are sequentially decreased; or, a highest occupied molecular orbital (HOMO) energy level of the main light emitting material of the first light emitting layer, a HOMO energy level of the main light emitting material of the second light emitting layer, a HOMO energy level of the main light emitting material of the third light emitting layer and a HOMO energy level of the main material of the charge blocking layer are sequentially decreased; wherein the second light emitting layer covers only two sub-pixels including the first sub-pixel and the second sub-pixel; and the charge blocking layer covers only two sub-pixels including the second sub-pixel and the third sub-pixel.