Electric lamp and discharge devices: systems – Plural power supplies – Plural cathode and/or anode load device
Reexamination Certificate
2005-06-21
2005-06-21
Vannucci, James (Department: 2821)
Electric lamp and discharge devices: systems
Plural power supplies
Plural cathode and/or anode load device
C315S169100, C345S076000
Reexamination Certificate
active
06909242
ABSTRACT:
A light emitting device capable of performing signal electric current write-in operations at high speed and without dispersion in the characteristics of TFTs structuring pixels influencing the brightness of light emitting elements is provided. The gate length L of a transistor in which an electric current flows during write-in of a signal electric current is made shorter than the gate length L of a transistor in which electric current supplied to EL elements flows during light emission, and high speed write-in is thus performed by having a larger electric current flow than the electric current flowing in conventional EL elements. A converter and driver transistor (108) is used for signal write-in. By using the converter and driver transistor (108) and a driver transistor (107) when supplying electric current to a light emitting element during light emission, dispersion in the transistor characteristics can be made to have less influence on brightness than when using a structure in which write-in operations and light emission operations are performed using different transistors.
REFERENCES:
patent: 5095248 (1992-03-01), Sato
patent: 5359341 (1994-10-01), Hutchings
patent: 5581160 (1996-12-01), Fujita
patent: 5673058 (1997-09-01), Uragami et al.
patent: 6037719 (2000-03-01), Yap et al.
patent: 6229506 (2001-05-01), Dawson et al.
patent: 6246180 (2001-06-01), Nishigaki
patent: 6278131 (2001-08-01), Yamazaki et al.
patent: 6380687 (2002-04-01), Yamazaki
patent: 6501466 (2002-12-01), Yamagishi et al.
patent: 2001/0029070 (2001-10-01), Yamazaki et al.
patent: 2003/0020413 (2003-01-01), Oomura
patent: 1 020 920 (2000-07-01), None
patent: 1 063 630 (2000-12-01), None
patent: 1 103 946 (2001-05-01), None
patent: 2000-86968 (2000-03-01), None
patent: 2001-5426 (2001-01-01), None
patent: 2001-343933 (2001-12-01), None
patent: WO 99/65011 (1999-12-01), None
Baldo et al.; “Highly Efficient Phosphorescent Emission From Organic Electroluminescent Devices”;Nature, vol. 395; pp. 151-154; Sep. 10, 1998.
Baldo et al.; “Very High-Efficiency Green Organic Light-Emitting Devices Based on Electrophosphorescence”;Applied Physics Letters, vol. 75, No. 1; pp. 4-6; Jul. 5, 1999.
Tsutsui et al.; “Electroluminescence in Organic Thin Films”;Photochemical Processes in Organized Molecular Systems; pp. 437-450; 1991.
Tsutsui et al.; “High Quantum Efficiency in Organic Light-Emitting Devices with Iridium-Complex as a Triple Emissive Center”;Japan Journal of Applied Physics, vol. 38; pp. L1502-L1504; Dec. 15, 1999.
Search Report (Application No. 2002005281-9; SG5975/5999/6447) dated Jul. 19, 2004.
Fish & Richardson P.C.
Semiconductor Energy Laboratory Co,. Ltd.
Vannucci James
Vu Jimmy T.
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