Seiko Epson Corporation

Cambridge Enterprise Limited

Simon Tam

Toshiyuki Kasai

Richard Henry Friend

Piero Migliorato

Vinayak Agrawal

Nishanth Kulasekeram

Simon W Moore

Philip C Paul

A smart-card chip arrangement comprises: a smart-card chip (); an organic semiconductor layer () disposed on a surface of the chip, and at least one transistor () formed in the organic semiconductor layer. The at least one transistor is configured so as to enable an invasive attack on the chip to be detected.

Smart card chip arrangement

A potentiostat is provided for a biosensor circuit and permits sequential and simultaneous measurements to be performed at different cells across a matrix of biosensing devices. Accordingly, a potentiostat comprises a first differential amplifier for receiving a scanning voltage at a first input terminal and a voltage at the reference electrode at a second input terminal and for generating an output voltage at an output terminal to be applied to the working electrode, wherein, when in use, a feedback loop of the potentiostat circuit is closed between the reference electrode and the working electrode.

Potentiostat circuit

A specially designed mask controls the arrangement of conductive materials that form a source and drain of a transistor. Designing the mask can be costly and time-consuming, which means that the testing of a circuit involving a transistor can also be costly, time consuming and a barrier towards efficient circuit development and testing. Accordingly, the present invention provides a pre-fabricated, general-purpose pattern comprising an array of conductive islands. The pattern is used as a source and a drain terminal for the formation of a thin-film transistor and as a conductive source for the formation of other electrical components upon the array.

Transistor circuit formation substrate

A method of sensing a property of each of a plurality of samples is disclosed. The method includes disposing a sensor chip in each sample, the sensor chip being adapted to sense the property of a respective sample and comprising sensing electronics, a wireless communication device and an identifier. Each sensor chip is then registered and sensed data is received from each of the registered sensor chips concurrently via the respective wireless communication device.

Application of biosensor chips

An organic TFT (OTFT) inverter arrangement comprises an inverter stage including a series arrangement of first and second MOS OTFTs (T, T) connected between first and second supply terminals (VDD), the first and second OTFTs having first and second gates, respectively. An input terminal (V) is connected to the first gate, while an output terminal (V) is connected to the node interconnecting the first and second OTFTs (T, T). A bias-control stage is connected between the first gate and the second gate. The bias-control stage is an inverting stage, such that, when an input voltage on the first gate rises, a voltage on the second gate falls, and vice-versa. The bias-control stage comprises a series arrangement of third and fourth OTFTs (T, T) connected between the first and second supply terminals (V, V), and a series arrangement of fifth and sixth OTFTs (T, T) connected between the first and second supply terminals (V, V). The fifth and sixth OTFTs (T, T) are controlled by the third and fourth OTFTs (T, T) and feed the first and second gates, respectively. The OTFT inverter arrangement may be used as the basis of an OTFT logic-gate arrangement.

Organic TFT inverter arrangement

The invention provides an electronic circuit that can include a programming path and a reproduction path. The circuit can further include a current driven element, a transistor in the production path arranged so as to operatively control a current supplied to the current driven element, a capacitor arranged for storing an operating voltage of the transistor, an additional transistor arranged in parallel to the transistor in the programming path for storing the capacitor and the operating voltage, and a switching device that controls the programming path and the reproduction path.

Electronic circuit, electroluminescent display device, electro-optical device, electronic apparatus, method of controlling the current supply to an organic electroluminescent pixel, and method for driving a circuit

It is known to compensate for threshold voltage variation of driving transistors in pixel circuits that drive light emission devices such as current driven organic light emission devices. However, programming and initialization of such pixel circuits can be slow and require a plurality of control or signal lines. The present invention provides a pixel circuit comprising an n-channel transistor for diode-connecting the driver transistor and a means for reducing the number of signal and control lines.

Pixel circuit

An optoelectronic device is disclosed with a light source, a wave guide and a first signal line, wherein a cell is formed at the intersection between the wave guide and the first signal line. The cell includes a light activated switch and an output device. The optoelectronic device may be an optoelectronic memory wherein the output device is a storage unit. Alternatively the optoelectronic device may be an optoelectronic display device wherein the output device is a light emitting device or a liquid crystal device.

Optoelectronic device

The present invention provides an improved form of inverter circuit which refines the known conventional circuit to reduce its offset and then uses a combination of this refined circuit and a feedback type power converter to achieve low output offset, very high speed and very high current efficiency. According to a first aspect of the present invention there is provided a voltage converter circuit comprising serially coupled first and second gain stages and switching means arranged between the second gain stage and an output for the converter circuit, the first gain stage having a gain greater than that of the second gain stage, and the second gain stage having a bandwidth greater than that of the first gain stage. According to a second aspect of the present invention there is provided A method of voltage conversion comprising serially coupling first and second gain stages and providing switching means arranged between the second gain stage and an output terminal, selecting the first gain stage to have a gain greater than the second gain stage, and selecting the second gain stage to have a bandwidth greater than that of the first gain stage.

Power converter circuit and method for power conversion

A display device comprising a driver circuit which modulates the duty cycle of the on-state of a pixel during a frame period. Preferably the driver circuit comprises a comparator and more preferably the comparator is formed of thin film transistors constituting a differential pair and an inverter. Also provided is a method of driving a display device comprising the step of modulating the duty cycle of the on-state of a pixel during a frame period. Beneficially the display device is an organic electroluminescent active matrix display device.

Display device, method of driving a display device, electronic apparatus

A display device comprising a plurality of pixels, each pixel containing a light emitting element and a plurality of substantially rectangular shaped circuit areas, the circuit areas comprising two current mirror circuit areas and two input pair circuit areas; the two current mirror circuit areas abutting each other so as to have a side of their rectangular areas in common, the two input pair circuit areas abutting each other so as to have a side of their rectangular areas in common, with both of the input pair circuit areas abutting a respective one of the current mirror circuit areas so as each to have a side of their rectangular areas in common. This arrangement of circuit areas overcomes the problem of spatial variation of TFT characteristics while avoiding the use of compensating circuits. Additionally, this arrangement of circuit areas can reduce to a minimum the p-type and n-type doping area required within each pixel.

Display device and electronic apparatus including the same

A driver circuit operating in stages that comprise a programming stage and a reproduction stage, the circuit comprising: a plurality current paths each of which passes through the circuit, a current driven element, a transistor connected so as operatively to control the current supplied to the said element, a capacitor connected for storing an operating voltage of the transistor during the programming stage, and switching means which control the current paths, the arrangement being such that one of the current paths does not include the said element. No current is applied to the current driven element by the current controlling transistor during the programming stage and thus the overall power consumption is reduced. Furthermore, the circuit can be operated from a normal supply voltage rather than requiring a high bias voltage. During the programming stage, the circuit uses a current sink rather than a current source. Preferably, the current driven element is an electroluminescent element.

CIRCUIT, DRIVER CIRCUIT, ORGANIC ELECTROLUMINESCENT DISPLAY DEVICE ELECTRO-OPTICAL DEVICE, ELECTRONIC APPARATUS, METHOD OF CONTROLLING THE CURRENT SUPPLY TO AN ORGANIC ELECTROLUMINESCENT PIXEL, AND METHOD FOR DRIVING A CIRCUIT

A current sensing circuit includes a differential current input stage connected to a differential voltage output stage. The differential current input stage includes a reference current input from a current source and a sensor current input from a sensing device; a first voltage output corresponding to the reference current and a second voltage output corresponding to the sensor current; and a first switch for substantially equalizing the first and second voltage outputs when closed. The first and second voltage outputs are respective inputs to the differential voltage output stage, which then outputs a differential output voltage corresponding to the difference between the first and second voltage outputs.

Sensing services and sensing circuits

A driver circuit comprises a p-channel transistor and an n-channel transistor connected as a complementary pair of transistors to provide analog control of the drive current for a current driven clement, preferably an organic electroluminescent element (OEL element). The transistors, being of opposite channel, compensate, for any variation in threshold voltage &#x394;Vand therefore provide a drive current to the OEL element which is relatively independent of &#x394;V. The complementary pair of transistors can be applied to either voltage driving or current driving pixel driver circuits.

CIRCUIT, DRIVER CIRCUIT, ELECTRO-OPTICAL DEVICE, ORGANIC ELECTROLUMINESCENT DISPLAY DEVICE ELECTRONIC APPARATUS, METHOD OF CONTROLLING THE CURRENT SUPPLY TO A CURRENT DRIVEN ELEMENT, AND METHOD FOR DRIVING A CIRCUIT

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Cambridge, United Kingdom

Simon Tam