Active matrix light emitting diode pixel structure and concomitant method

Patent 6229506 Issued on May 8, 2001. Estimated Expiration Date:

April 22, 2018. 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

Patent References

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Inventors

Assignee

Sarnoff Corporation

Application

No. 064696 filed on 04/22/1998

US Classes:

345/82, Solid body light emitter (e.g., LED)345/92Thin film tansistor (TFT)

Examiners

Primary: Chow, Dennis-Doon

Attorney, Agent or Firm

Burke; William J.

International Class

G09G 003/32

Abstract

A LED pixel structure that reduces current nonuniformities and threshold voltage variations in a "drive transistor"of the pixel structure is disclosed. The LED pixel structure incorporates a current source for loading data into the pixel via a data line. Alternatively, an auto zero voltage is determined for the drive transistor prior to the loading of data.

Other References

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J. Vanfleteren, J. Capon, J. De Baets, I. De Rycke, H. De Smet, J. Doutreloigne, A. Van Calster, P. De Visschere, "Evaluation of a 64×64 CdSe TFT Addressed ACTFEL Display Demonstrator", Proceedings IEEE, 1991
J. Vanfleteren, J. De Baets, I. De Rycke, H. De Smet, J. Doutreloigne, A. Van Calster, P. Visschere, "Design of a Prototype Active Matrix CdSe TFT Addressed EL Display", Eurodisplay 1991, pp. 216-219
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