Active matrix electroluminescent display devices
Patent 6373454 Issued on April 16, 2002. Estimated Expiration Date: 
June 9, 2019. 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.
June 9, 2019. 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.Patent ReferencesActive matrix electroluminescent display and method of operation Time multiplexed gray scale approach Active matrix electroluminescent grey scale display Image display device with element driving device for matrix drive of multiple active elements Active matrix light emitting diode pixel structure and concomitant method Patent #: 6229506 InventorsApplicationNo. 329027 filed on 06/09/1999US Classes:345/76, Electroluminescent315/169.3, Electroluminescent device345/82, Solid body light emitter (e.g., LED)345/205Physically integral with display elementsExaminersPrimary: Hjerpe, RichardAssistant: Nguyen, Francis Attorney, Agent or FirmForeign Patent References
International ClassG09G 003/30Foreign Application Priority Data1998-06-12 GBAbstractAn active matrix electroluminescent display device has an array of current-driven electroluminescent display elements (20), for example comprising organic electroluminescent material, whose operations are each controlled by an associated switching means (10) to which a drive signal for determining a desired light output is supplied in a respective address period and which is arranged to drive the display element according to the drive signal following the address period. Each switching means comprises a current mirror circuit (30, 32, 38) in which the same transistor (30) is used to both sense and produce the required drive current for the display element (20) with the gate of the transistor being connected to a storage capacitance (30) on which a voltage determined by the drive signal is stored. This allows variations in transistor characteristics over the array to be compensated and improved uniformity of light outputs from the display elements to be obtained.Other References
Field of SearchElectroluminescentSolid body light emitter (e.g., LED) Solid light-emitting display elements Electroluminescent Light-emitting diodes Display elements arranged in matrix (e.g., rows and columns) Physically integral with display elements Having common base or substrate Envelope structure or material Including particular phosphor Plural Coplanar electrodes With accelerating or control electrode Phosphor on anode segments WITH LUMINESCENT SOLID OR LIQUID MATERIAL Electrode structure or material Phosphor on envelope wall With gaseous discharge medium With amalgam Solid-state type Aperture-type tube With protective coating or filter Vacuum-type tube With shield or additional electrode With dielectric layer Diverse-type energizing or bias supplies to different electrodes Electroluminescent device Gas display panel device ORGANIC SEMICONDUCTOR MATERIAL | |
