Abstract:
The invention relates to a method and apparatus for the application of material to form a layer of an organic electroluminescent device. The material is sputter deposited typically from at least one target of material held in respect to a magnetron in a coating chamber. The magnetrons used can be unbalanced magnetrons and/or are provided with other magnetrons and/or magnet arrays in a closed field configuration. The material is found to be deposited in a manner which prevents or minimises damage to the device and hence reduces or removes the need for a barrier layer to be applied.
Abstract:
This invention generally relates to electronic displays, in particular organic light emitting diode (OLED) -based displays, and to techniques for compensating for variations in display element brightness such as those caused by ageing. A method of compensating for variations in brightness of an OLED display element of a passive OLED display device, the display device having a plurality of said OLED display elements mounted on a substrate, the method comprising: driving a said display element to emit light; detecting a brightness said emitted light after waveguiding by said substrate; and compensating for a variation in said display element brightness responsive to said detecting.
Abstract:
This invention generally relates to improved structures for organic light emitting diodes (OLEDs), and more particularly to so-called top emitting OLEDs. An organic light emitting diode (OLED) (300) comprising a substrate (102) bearing a Tight emitting layer (108a), b between an electrically conducting anode (106) and an electrically conducting cathode (200), the diode being configured for Tight emission through said cathode, the cathode being transmissive at a light emission wavelength of the diode, and wherein said cathode incorporates an optical interference structure (202), (204), (206) configured to enhance light transmission through said cathode at said emission wavelength.
Abstract:
An organic optoelectronic device comprising a substrate (201) having an upper surface and a lower surface, at least one organic diode situated on the upper surface of the substrate, the organic diode comprising, an anode (204) comprising a material of high work function situated over the upper surface of the substrate, an organic optoelectronic material (205) at least partially overlying the anode, a cathode (206) comprising a material of low work function at least partially overlying the organic optoelectronic material, the cathode being transparent or semi-transparent, characterised in that the substrate comprises at least one connecting via (202, 203) extending through the substrate from the lower surface to the upper surface, the connecting via being suitable for providing an electrical connection between at least one of the anode and/or the cathode of the organic diode and an external circuit (209). The invention has application in organic light emitting devices and organic photovoltaic devices.
Abstract:
The present invention is directed to interconnectable building blocks (100) suitable for use in a toy building set. The building blocks comprise at least one coupling pin (102) or at least one counter coupling socket and an organic optoelectronic device (101). Preferred organic optoelectronic devices include organic light emitting devices (202) and organic photovoltaic devices (210).
Abstract:
This invention generally relates to display driver circuits for electro-optic displays, and more particularly relates to circuits and methods for driving active matrix organic light emitting diode displays with greater efficiency. A display driver (800) for an electroluminescent display (802), comprises a plurality of electroluminescent display elements each associated with a display element driver circuit (820), each said display element driver circuit including a drive transistor having a control connection for driving the associated display element in accordance with a voltage on the control connection. The display driver comprises at least one display element brightness controller (846) to provide an output to drive a said control connection to control the electroluminescent output from a said display element. A voltage sensor (854, 858) senses the voltage on a said control connection; and a power controller (860) for controls an adjustable power supply for providing an adjustable voltage to said electroluminescent display to power said drive transistors for driving said display elements. The power controller is configured to provide a control signal to adjust said power supply voltage in response to said sensed voltage.
Abstract:
Display driver circuitry for electro-optic displays, in particular active matrix displays using organic light emitting diodes. The circuitry comprises a driver to drive an electro-optic element in accordance with a drive voltage, a photosensitive device optically coupled to the electro-optic display element to pass a current dependent upon illumination reaching the photosensitive device, a first control device coupled between the photosensitive device and a data line and responsive to a first control signal on a first control line to couple the photosensitive device to the data line; and a second control device coupled between the photosensitive device and the driver and responsive to a second control signal on a second control line to couple the photosensitive device to the driver. The circuit can be operated in a number of different modes and provides flexible control of an electro-display element such as an organic LED pixel.
Abstract:
A display device comprising: an anode (12); a cathode (14); and a region of an organic electroluminescent material (13) located between the anode and the cathode; wherein: the organic electroluminescent material is a blue-light emitter; and the cathode (14) comprises a first layer (16) and a second layer (17) located between the first layer (16) and the organic electroluminescent material (13), the first layer (16) comprising aluminium and the second layer (17) comprising at least one of sodium fluoride and potassium fluoride.
Abstract:
A polymer for use in an optical device comprising: a hole transporting region, an electron transporting region, an emissive region, said polymer comprising an optionally substituted repeat unit of formula (I): wherein each Ar is the same or different and comprises an optionally substituted aryl group.
Abstract:
A process for the preparation of a conjugated poly(arylene vinylene) copolymer for use in a luminescent device, which comprises: (1) providing a precursor polymer comprising units of general formula -(-ArCHR -CR L-)-n, in which Ar is substituted or unsubstituted arylene, L is a leaving group, R and R are each independently H, alkyl, alkoxy, aryl or an electron-withdrawing group, and n is an integer; (2) reacting the precursor polymer with a reactant comprising a carboxylate, an aldehyde, a ketone, a sulphonate, a thioate, a disulphide, a xanthate, an amine, a pyridine, a hydrazide, a phenoxide, an alcohol with a boiling point above 100 DEG C, or a derivative thereof, under substitution conditions whereby a proportion of the leaving groups are substituted to form a substituted precursor copolymer comprising units of general formula -(-ArCHR -CR L-)-m -(-ArCHR -CR X-)-l, in which Ar, R , R and L are as defined above, X is a substituent group from the reactant, l and m are independently integers; and (3) converting the substituted precursor copolymer to a conjugated poly(arylene vinylene) copolymer by elimination of the leaving groups from the substituted precursor copolymer.