Patent ID: 7851074

Claim:
An organic electroluminescent display device comprising at least one organic luminous layer sandwiched between a transparent electrode and a backside electrode, wherein said display device is driven as a liquid crystal display device at a voltage lower than a light emission initiating potential of the organic luminous layer and as an electroluminescent display device at a voltage higher than a light emission initiating potential of the organic luminous layer in response to magnitude of an applied voltage, wherein the organic luminous layer comprises at least one electroluminescent liquid crystal comprising at least one chemical compound represented by general formulas (I), (II), (III) or (V): wherein R 1 is a straight chained alkyl group containing 1-20 carbon atoms, R 2 to R 9 are each independently selected from hydrogen or an alkyl group containing 1-3 carbon atoms, and Ar 1 is a substituted or non-substituted aryl group containing 6-14 carbon atoms; wherein R 10 and R 11 are each independently selected from straight chained alkyl groups containing 1-20 carbon atoms, and Ar 2 and Ar 3 are each independently selected from substituted or non-substituted aryl groups containing 6-14 carbon atoms; wherein R 12 is a straight chained alkyl group containing 1-20 carbon atoms, and R 13 , R 14 , R 15 , R 16 and R 17 are each independently selected from hydrogen and alkyl groups containing 1-3 carbon atoms; wherein R 20 is a straight chained alkyl group containing 1-20 carbon atoms, and Ar 6 , Ar 7 , Ar 8 , Ar 9 and Ar 10 are each independently selected from substituted or non-substituted aryl groups containing 6-14 carbon atoms.