Organic electroluminescent device with black insulator
An improved organic electroluminescent device is provided. The device may include a protection layer provided on non-light-emitting regions of a panel to prevent reflection of external light. The protection layer may include an optical filter used in combination with a black insulator. The protection layer may provide for improved reflectance and transmissivity, and improved brightness without a commensurate reduction in contrast.
1. An organic electroluminescent device including a plurality of pixels each having a first electrode, an organic electroluminescent layer and a second electrode, the device further comprising:
a black insulator provided at regions between adjacent pixels, wherein the black insulator reduces reflection of externally incident light and provides insulation between adjacent pixels, and
an optical filter oriented in a direction such that light generated by the electroluminescent layer is directed to an outside of the device,
wherein the black insulator is directly formed on a semiconductor material of a driving thin film transistor.
2. The organic electroluminescent device as claimed in claim 1 , wherein the black insulator is patterned in the form of a strip or matrix.
3. The organic electroluminescent device as claimed in claim 1 , wherein the black insulator includes an organic material, an inorganic material, an inorganic material oxide, or a mixture of an inorganic material and a polymer.
4. The organic electroluminescent device as claimed in claim 1 , wherein the black insulator absorbs substantially all light of a visible ray region.
5. The organic electroluminescent device as claimed in claim 1 , wherein the optical filter has a transmissivity of approximately 50% in a visible ray region.