EL display device and a method of manufacturing the same

Patent 6620528 Issued on September 16, 2003. Estimated Expiration Date:

July 19, 2020. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.

Abstract Claims Description Full Text

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Inventors

Assignee

Semiconductor Energy Laboratory Co., Ltd.

Application

No. 09/619485 filed on 07/19/2000

US Classes:

428/690, Fluroescent, phosphorescent, or luminescent layer252/301.33, With inorganic luminescent material257/101, With particular dopant concentration or concentration profile (e.g., graded junction)257/102, With particular dopant material (e.g., zinc as dopant in GaAs)257/103, With particular semiconductor material313/506, Plural layers428/917ELECTROLUMINESCENT

Examiners

Primary: Kelly, Cynthia H.
Assistant: Garrett, Dawn

Attorney, Agent or Firm

International Classes

H01L 51/50 (20060101)
H01L 27/28 (20060101)
H01L 27/32 (20060101)
H01L 51/52 (20060101)

Foreign Application Priority Data

1999-07-23 JP

Abstract

To provide an inexpensive EL display device of high definition. An anode, a light emitting layer, and a cathode are formed on a substrate, and selective doping using at least one selected from the group consisting of an alkali metal element, an alkaline earth metal element and a halogen element is then performed to form at least ones of electron transmitting regions and hole transmitting regions. In such a structure, only a part of the light emitting layer, where at least ones of the electron transmitting regions and the hole transmitting regions are formed, emits light when a given voltage is applied to the light emitting layer, whereby images are displayed as desired.

Other References

Takeki Kofuji, "Development of Organic EL Element to Single Layer Type", Electronic Journal 6th FPD Seminar, Jun. 29, 1999, pp. 83-88
Tsutsui et al., "Electroluminescence in Organic Thin Films", Photochemical Processes in Organized Molecular Systems, 1991, pp. 437-450
Baldo et al., "Very High-Efficiency Green Organic Light-Emitting Devices Based on Electrophosphorescence", Applied Physics Letters, vol. 75, No. 1, Jul. 5, 1999, pp. 4-6
Baldo et al., "Highly Efficient Phosphorescent Emission From Organic Electroluminescent Devices", Nature vol. 395, Sep. 10, 1998, pp. 151-154
Tsutsui et al., High Quantum Efficiency in Organic Light-Emitting Devices with Iridium-Complex as a Triplet Emissive Center, Japanese Journal of Applied Physics, vol. 38, Part 12B, Dec. 15, 1999, pp. L1502-L1504
Related Application U.S. patent application Ser. No. 09/615,264 "EL Display Device And A Method of Manufacturing The Same," filed Jul. 13, 2000
Related Application U.S. patent application Ser. No. 09/815,661 "Method of Manufacturing A Light Emitting Device," filed Mar. 23, 2001