Patent ID: 8827488

Claim:
A first device, comprising: a plurality of pixels, wherein each pixel includes an R sub-pixel, a G sub-pixel, a B1 sub-pixel and a B2 sub-pixel, wherein: each R sub-pixel comprises a first organic light emitting device that emits light having a peak wavelength in the visible spectrum of 580-700 nm, further comprising a first emissive layer having a first emitting material; each G sub-pixel comprises a second organic light emitting device that emits light having a peak wavelength in the visible spectrum of 500-580 nm, further comprising a second emissive layer having a second emitting material; each B1 sub-pixel comprises a third organic light emitting device that emits light having a peak wavelength in the visible spectrum of 400-500 nm, further comprising a third emissive layer having a third emitting material; each B2 sub-pixel comprises a fourth organic light emitting device that emits light having a peak wavelength in the visible spectrum of 400 to 500 nm, further comprising a fourth emissive layer having a fourth emitting material; the third emitting material is different from the fourth emitting material; and the peak wavelength in the visible spectrum of light emitted by the fourth organic light emitting device is at least 4 nm less than the peak wavelength in the visible spectrum of light emitted by the third organic light emitting device; a first device plane comprising a plurality of the first organic light emitting device and a plurality of the second organic light emitting device, wherein the first device plane is parallel to the plane of the plurality of the first organic light emitting device and a plurality of the second organic light emitting device; a second device plane comprising a plurality of at least one of the third organic light emitting device and the fourth organic light emitting device, wherein the second device plane is parallel to the Diane of the at least one of the third organic light emitting device and fourth organic light emitting device; wherein the planes of the first and second device planes are parallel, the second device plane is transposed from the first device plane in a direction perpendicular to the planes of the first and second device planes, and the first and second device planes are superposed.