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US 6,777,712 B2Granted
Low-power organic light emitting diode pixel circuit
AssigneeInternational Business Machines Corporation
InventorsJames Lawrence Sanford, Eugene S. Schlig
Life of this patent
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Abstract
A pixel circuit comprises an organic light emitting diode (OLED), and a static memory for storing data that represents an operational state of the OLED. In alternative embodiments, a pixel circuit may include a complementary metal oxide semiconductor (CMOS) circuit for controlling the OLED, a protection circuit for protecting the CMOS circuit from an over-voltage condition, and a current source with a field effect transistor (FET) having a static gate to source voltage that is greater than a threshold voltage of the FET.
Claims20
A pixel circuit comprising:
- an organic light emitting diode (OLED);
- a complementary metal oxide semiconductor (CMOS) circuit for controlling said OLED;
- and
- a protection circuit for protecting said CMOS circuit from over-voltage damage.
1 more element
A pixel circuit comprising:
- an organic light emitting diode (OLED);
- and
- a complementary metal oxide semiconductor (CMOS) circuit for controlling said OLED,
- wherein said CMOS circuit comprises a current source comprising a field effect transistor (FET) having a static gate to source voltage that is greater than a threshold voltage of said FET.
1 more element
Dependencies are inferred from the claim text.