Light emitting device and electronic device

Patent 7061451 Issued on June 13, 2006. Estimated Expiration Date:

February 20, 2022. 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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Inventor

Kimura, Hajime

Assignee

Semiconductor Energy Laboratory Co., Ltd.

Application

No. 10079072 filed on 02/20/2002

US Classes:

345/76, Electroluminescent345/55, Display elements arranged in matrix (e.g., rows and columns)345/92, Thin film tansistor (TFT)345/211, Display power source315/169.1, Diverse-type energizing or bias supplies to different electrodes315/169.3, Electroluminescent device315/169.4, Gas display panel device345/87, Liquid crystal display elements (LCD)257/59, In array having structure for use as imager or display, or with transparent electrode438/162, Introduction of nondopant into semiconductor layer345/90, Control means at each display element345/82, Solid body light emitter (e.g., LED)349/151, With driving circuit having input and output electrodes on liquid crystal substrate257/350Insulated electrode device is combined with diverse type device (e.g., complementary MOSFETs, FET with resistor, etc.)

Examiners

Primary: Tran, Henry N.

Attorney, Agent or Firm

Cook, Alex, McFarron, Manzo, Cummings & Mehler, Ltd.

Foreign Patent References

1 061 497 EP 12/01/2000
2000-221942 JP 08/01/2000
2000-235370 JP 08/01/2000
2000-347621 JP 12/01/2000
2001-42822 JP 02/01/2001
2001-60076 JP 03/01/2001

International Class

G09G 3/30

Abstract

There is provided a light emitting device capable of preventing light emission of an OLED caused due to an off current of a driver TFT and suppressing a reduction in a contrast, to thereby display a beautiful image. A wiring which is kept at a predetermined potential (hereinafter referred to as a discharge line) is provided to make the off current flow into the discharge line rather than into the OLED. A TFT such as is turned on when the driver TFT is tuned off (hereinafter referred to as a discharging TFT) is provided in each pixel. With respect to the source region and the drain region of the discharging TFT, one is connected with a pixel electrode and the other is connected with the discharge line. According to the above structure, when the driver TFT is turned off, the discharging TFT is turned on. Thus, the off current in the driver TFT actively flows into the discharge line rather than into the OLED.

Other References

JP 2000-221942 English abstract.
JP 2000-235370 English abstract.
JP 2000-347621 full English translation.
JP 2001-42822 full English translation.
JP 2001-60076 English abstract.
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