Abstract: An active matrix display device includes a plurality of pixels (10) arranged as rows and columns and column electrodes (16) extending along corresponding columns of pixels (10). The pixels include a capacitance (18,70) for storing image data and a read circuit for reading the charge stored on the capacitance (18,70) and driving the column electrode with the read charge.

Abstract: An active matrix display device comprises an array of picture elements, e.g. liquid crystal picture elements, first and second sets of address conductors (16, 18) extending in row and column directions respectively and connected with the picture elements, and a set of connection conductors (30) extending in the same direction as the second set of address conductors (18), each of which is connected to a respective one of the first set of conductors (16) at the location of a picture element, and via which address signals are supplied to that first set.

Abstract: An active matrix array device, such as an AMLCD, has an array of matrix elements (10) addressed via sets of address conductors (14, 16). An address circuit (35) connected to one set (16) includes a multiplexing circuit (31) integrated on the same substrate (25) as the matrix elements and the address conductors of the one set are organised in groups with each conductor in a group being associated with a respective and different one of a plurality of signal bus lines (33) in the multiplexer circuit. Each signal bus line (33) is connected to a respective signal processing circuit (42), e.g. a DAC in the case of an AMLCD, also integrated on the substrate as respective circuit blocks. To avoid problems in use, for example caused by variations in the performance of these signal processing circuits, the arrangement of couplings with the bus lines of the address conductors in adjacent groups is mirrored about the boundary between the groups.

Abstract: An active matrix liquid crystal display device comprising display elements (10) addressed via sets of row and column address conductors (14, 16) connected respectively to row and column drive circuits (30, 35) and with the column drive circuit (35) being operable to transfer data signals for the display elements of a row to groups of column address conductors (16) in sequence in respective group address periods in a multiplexing manner. The occurrence of undesirable display artifacts is alleviated by applying, during the group address period for one group, a pre-charging signal to the adjacent column address conductor of the next-addressed group according to the level (magnitude) of a data signal for a column conductor in that one group.

Abstract: An active matrix device comprises two or more adjacent sub-matrices (22a, 22b, 22c), each comprising a set of row address conductors (34), a set of column address conductors (32), and control elements disposed at intersections of the row and column address conductors. Each control element has a scan input connected to a row address conductor and a data input connected to a column address conductor. The device is divided into sub-matrices (22a, 22b, 22c) between adjacent row address conductors (34). Simultaneous addressing of the sub-matrices allows the data supply frequency to be reduced, leading to a decrease in overall power consumption.

Abstract: An active matrix electroluminescent display device comprises an array of display pixels (4) arranged in rows and columns with each row of pixels sharing a common line, and with currents through the display elements of a row of pixels passing along the common line. Error values (e) are generated to correct the drive signals (V) for each pixel in a row of pixels, to correct for the different voltages appearing on the common line. These different voltages give rise to horizontal cross talk. The error values (e) are derived from a circuit (34) representing an additional row of pixels and associated with the driver circuitry (32), and result in updated drive signals (V′).

Abstract: A display device with capacitive display pixels, in which a drive scheme is used for capacitive coupling of voltages to enable reduced column voltage swings to be obtained. Each pixel has two storage capacitors. The use of two storage capacitors provides some freedom in the choice of the magnitude of the voltage swing provide on one terminal of one of the storage capacitors. The first capacitor (C1) of all pixels of the display may be grounded, and only the second capacitor (C2) is subjected to changes in voltage to be capacitively coupled to the display cell. This provides a flexible capacitor line drive type scheme.

Abstract: Driving schemes are described in which rows (1 to m) are selected one at a time and column data voltages are inverted to provide inversion schemes for display devices comprising pixels (12) arranged in rows (1 to m) and columns (1 to n). The order in which rows are selected is such that a first plurality of successive rows (or groups of rows) of those rows (or groups of rows) to be driven with a first polarity are driven consecutively, followed by a first plurality of successive rows (or groups of rows) of those rows (or groups or rows) to be driven with a second polarity, followed by a second plurality of successive rows (or groups of rows) of those rows (or groups of rows) to be driven with the first polarity, and so on. The polarity is inverted less often, so saving power.

Abstract: An active matrix display device comprises an array of picture elements, e.g. liquid crystal picture elements, first and second sets of address conductors (16, 18) extending in row and column directions respectively and connected with the picture elements, and a set of connection conductors (30) extending in the same direction as the second set of address conductors (18), each of which is connected to a respective one of the first set of conductors (16) at the location of a picture element, and via which address signals are supplied to that first set.

Abstract: An active matrix display device comprises an array of picture elements, e.g. liquid crystal picture elements, first and second sets of address conductors (16, 18) extending in row and column directions respectively and connected with the picture elements, and a set of connection conductor lines (30′) extending in the same direction as one set of address conductors (18), each of which is connected to a respective one of the other set of conductors (16), and via which address signals are supplied to that other set.

Abstract: A pixellated device (10), such as a display, has pixel row and column address lines (18,20) for addressing each pixel, thereby providing signal data to each pixel (12) or reading signal data from each pixel. An array of memory cells (22) is provided on the substrate interspersed with the pixel drive circuitry (16), wherein memory address circuitry (24,26,28,30) is provided enabling data to be written to each memory cell and enabling data to be read from each cell (22), independently of the signal data. Each memory cell (22) is thus addressable independently of the pixel data. Thus, the memory cells do not form part of the pixel circuitry, which allows the memory to be used in a flexible manner. For example, the memory may be used for purposes not directly associated with the driving or addressing of the pixels of the device.

Abstract: An active matrix display device includes a plurality of pixels (10) arranged as rows and columns and column electrodes (16) extending along corresponding columns of pixels (10). The pixels include a capacitance (18,70) for storing image data and a read circuit for reading the charge stored on the capacitance (18,70) and driving the column electrode with the read charge.

Abstract: An active matrix device includes a plurality of display elements 10 including a data storage node 18, 72 for storing data in the form of charge on a capacitor 72 and/or capacitative element 18. Refresh circuitry 51 is provided to refresh the data storage node, for example including temporary storage circuit 55 and drive circuit 56.

Abstract: A display device comprises an array of pixels arranged in rows and columns, each pixel comprising a current-driven display element, for example an electroluminescent display element. Driver circuitry is provided for producing current signals for driving the display elements. The driver circuitry generates a voltage function and supplies it to the input of a binary weighted capacitor network, each capacitor of the network being connected in series with a respective switching transistor. An input word to the driver circuitry controls the switching of the switching transistors, such that the output current of the driver circuitry is a function of the voltage function and of the combined capacitance of the capacitors of the network for which the associated switching transistor is closed. The output current is supplied to a selected pixel of the array.

Abstract: In an active matrix LC display device having an array of display elements (12) addressed via respective transistors (11) connected to sets of row address conductors (14) to which selection pulses are applied in sequence and column address conductors (16) to which data signals are applied, and a storage capacitor (18) connected between each display element and a row conductor adjacent that to which its associated transistor is connected and which is operable in a capacitive coupling drive mode in which a step level in the waveform applied to each row conductor contributes to the final display element voltage, the row drive waveform applied to each row conductor includes a step level both before and after the selection pulse. Through this, the vertical scanning direction used can readily be reversed and an advantageous dot-inversion drive scheme can be employed.

Abstract: A display device, for example a liquid crystal display device (1), and driving method are provided that avoid the need to provide the display device with display data (e.g. video) containing individual display settings for each pixel. The display device comprises an array of pixels (21-36, 71a-79d, 121-136) and an array of processing elements (41-48, 71-79, 141-148), each processing element being associated with a respective pixel or group of pixels. The processing elements (41-48, 71-79, 141-148) perform processing of compressed input display data at pixel level. The processing elements (41-48, 71-79, 141-148) decompress the input data to determine individual pixel settings for their associated pixel or pixels. The processing elements (41-48, 71-79, 141-148) then drive the pixels (21-36, 71a-79d ,121-136) at the individual settings. A processing element may interpolate pixel settings from input data allocated to itself and one or more neighbouring processing elements.

Abstract: An active matrix LC display device comprises an array of display elements (10) driven via sets of row and column address conductors (14, 16) connected respectively to a row drive circuit (30) operable to select each row in turn and a column drive circuit (35) for providing respective data signals for the display elements of a selected row and which comprises a multiplexing circuit arranged to address groups of column address conductors (16) in succession during a row address period. To avoid, or reduce, unwanted display artifacts arising from the use of a multiplexing circuit, the column drive circuit (35) is arranged to charge at least the last column address conductor in a group in at least two separate charging periods with the second charging period occurring after a charging period of the next group in the sequence.

Abstract: An active matrix device comprises two or more adjacent sub-matrices (22a, 22b, 22c), each comprising a set of row address conductors (34), a set of column address conductors (32), and control elements disposed at intersections of the row and column address conductors. Each control element has a scan input connected to a row address conductor and a data input connected to a column address conductor. The device is divided into sub-matrices (22a, 22b, 22c) between adjacent row address conductors (34). Simultaneous addressing of the sub-matrices allows the data supply frequency to be reduced, leading to a decrease in overall power consumption.

Abstract: An active matrix LC display device comprising an array of display elements (10), each having a switching device (12) addressed via sets of row and column address conductors (14, 16) connected respectively to a row scanning circuit (30) and a column drive circuit (35) providing data signals. The column drive circuit is operable in a manner such that an output thereof associated with one column conductor becomes high impedance prior to or while a data signal is applied to an adjacent column conductor. Unwanted display artefacts resulting from this kind of operation are avoided by arranging the column conductor (16) associated with a display element to lie inwardly of the edges of the display element electrode (18), for example towards the central axis of the electrode, in order to reduce capacitive coupling effects.

Abstract: An active matrix array device, such as an AMLCD, has an array of matrix elements (10) addressed via sets of address conductors (14, 16). An address circuit (35) connected to one set (16) includes a multiplexing circuit (31) integrated on the same substrate (25) as the matrix elements and the address conductors of the one set are organised in groups with each conductor in a group being associated with a respective and different one of a plurality of signal bus lines (33) in the multiplexer circuit. Each signal bus line (33) is connected to a respective signal processing circuit (42), e.g. a DAC in the case of an AMLCD, also integrated on the substrate as respective circuit blocks. To avoid problems in use, for example caused by variations in the performance of these signal processing circuits, the arrangement of couplings with the bus lines of the address conductors in adjacent groups is mirrored about the boundary between the groups.