Abstract: An optical path length adjuster enables electro-optical control of a physical path length between two optical elements, suitable for use in the adjustment of an optical path length within three dimensional display devices that generate a virtual image within a defined imaging volume. The adjuster varies an optical path length between an input optical path and an output optical path and includes: a first polarization switch for selecting a polarization state for an input beam on the input optical path; first and second beam splitters having at least two possible optical paths of different lengths therebetween, for passing the input beam along a selected one of said at least two possible optical paths according to the selected polarization state of the input beam and for providing an output beam of light, on said optical output path, that has traveled along the selected optical path.

Abstract: An optical path length adjuster enables electro-optical control of a physical path length between two optical elements, suitable for use in the adjustment of an optical path length within three dimensional display devices that generate a virtual image within a defined imaging volume. The adjuster varies an optical path length between an input optical path and an output optical path and includes: a first polarisation switch for selecting a polarisation state for an input beam on the input optical path; first and second beam splitters having at least two possible optical paths of different lengths therebetween, for passing the input beam along a selected one of said at least two possible optical paths according to the selected polarisation state of the input beam and for providing an output beam of light, on said optical output path, that has traveled along the selected optical path.

Abstract: In the color projector (200, 300, 400), a light source (220) produces first, second, and third colored light beams. An optical integrator (230, 330, 430) integrates the first colored light beam, the second colored light beam, and the third colored light beam. The integrated first colored light beam, second colored light beam, and third colored light beam are modulated by first (252), second (254), and third (256) light modulators, respectively, producing first, second, and third colored images. An optical synthesizer (260) combines the first, second, and third colored images to form a synthesized color image, and a projection lens (180) projects the synthesized color image. The optical integrator (230, 330, 430) includes a polarizing beam splitter (240, 441) in an optical path of at least one of the first, second, and third colored light beams to increase the effective integration length of the corresponding colored light beam.

Abstract: The invention provides for a method and display apparatus (10) having driving circuitry for driving a display panel (24) having a plurality of addressable discharge cells (26) driven by display pulses (DP), including the steps of applying data pulses (DAP) during the time interval between display pulses (DP) and characterized by the step of priming charges for each of the discharge cells (26) by means of the reset discharges so as to reduce the required data voltage, and in particular such a method wherein one TV-field period (TF) is divided into a plurality of sub-fields (SF) all of which are of substantially equal time durations.

Abstract: A display device for generating a three-dimensional volumetric image incorporates an optical path length adjuster enables electro-optical control of a physical path length between a display panel and a focusing element, to generate a virtual image within a defined imaging volume. The adjuster varies an optical path length between an input optical path and an output optical path and includes: a first polarisation switch for selecting a polarisation state for an input beam on the input optical path and an optical element having birefringent properties and thereby defining at least two possible effective optical paths of different lengths therethrough, for passing the input beam along a selected one of said at least two possible optical paths according to the selected polarisation state of the input beam and for providing an output beam of light, on said optical output path, that has travelled along the selected optical path.

Abstract: The invention provides a method of activating an electronic paint (10). A first embedded position marker (20) in a first portion (14) of an image (12) written onto a first portion of the electronic paint (10) is scanned. A position of an electronic brush (30) is determined based on the scanned position marker (20). Image data is modified to embed a second position marker (26) in a second portion (16) of the image (12) based on the determined position of the electronic brush (30). The second portion (16) of the image (12) including the second position marker (26) is written onto a second portion of the electronic paint (10).

Abstract: An optical path length adjuster (53) enables electro-optical control of a physical path length between two optical elements, suitable for use in the adjustment of an optical path length within three dimensional display devices that generate a virtual image within a defined imaging volume.

Abstract: A flat panel display apparatus comprises plasma discharge cells, which formed between a first base plate (2a) and a second base plate (1a). The first base plate (2a) has pairs of sustain electrodes (2b, 2c), and a second base plate (1a) has data electrodes (1b). Between said electrodes (2b, 2c, 1b) discharge volumes are formed. The device further has a drive circuit which comprises a circuit for providing data to the discharge cells. The display device comprises a conductive layer (51, 72, 91, 101) on the first (2a) or second substrate (1a) for both of a pair of sustain electrodes (2b, 2c). Said conductive layer (51, 72, 91, 101) extends outside the discharge volume (4) and forms an internal capacitance (Cpar) in the display device which capacitance is in parallel to the capacitance formed in operation by the pair of sustain electrodes and the discharge.

Abstract: A matrix display device comprises a matrix of optically addressable pixels (Pij) which comprise a light sensitive element (LSij) and a pixel light generating element (LGij). The light generating element (LGij) will produce a pixel light (LMij) with a brightness which depends on the state of the light sensitive element (LSij). The state of the light sensitive element (LSij) depends on the amount of light impinging on it. The actual brightness of the pixel light generating element (LGij) may further depend on a voltage across it. The pixels (Pij) are constructed such that a portion of the pixel light (PLMij) generated by the pixel light generating element (LGij) reaches the associated light sensitive element (LSij) of the pixel (Pij). The light sensitive element (LSij) is sensitive to the portion of the pixel light (PLMij) to obtain a feedback of the portion of the pixel light (PLMij) to the light sensitive element (LSij).

Abstract: A matrix display device comprises a matrix of optically addressable pixels (Pij) with a light sensitive element (LSij) which receives data light (Lj) to control a state of the light sensitive element (LSij) depending on the data light (Lj), and a pixel light generating element (LGij) which generates an amount of pixel light (LMij) depending on the state of the light sensitive element (LSij). A select driver (SD) supplies select voltages (SVi) to lines (LRi) of the pixels (Pij), the select voltages (SVi) having a level which does not allow the amount of pixel light (LMij) of the pixel light generating elements (LGij) to be substantially changed for not selected lines (LRi), the select voltages (SVi) having a level which does allow the amount of pixel light (LMij) of the pixel light generating elements (LGij) to be changed for a selected one of the lines (LRi). At least one data light generating device (ALj; LAS) directs the data light (Lj) to the light sensitive element (LSij).

Abstract: A matrix display device comprises a matrix of optically addressable pixels (Pij). The pixels (Pij) comprise a light sensitive element (LSij) and a pixel light generating element (LGij). The light generating element (LGij) of a particular pixel (Pij) produces light with a brightness which depends on the state of the light sensitive element (LSij). The state of the light sensitive element (LSij) depends on an amount of light impinging on it. The matrix display further comprises a laser (LAS) which generates laser beam (LB), and a laser scanner (SCA) which scans the laser beam (LB) along the pixels (Pij). At the instant the laser beam (LB) impinges on the light sensitive element (LSij), the brightness of the laser beam (LB) determines the state of the light sensitive element (LSij), and thus the state of the pixel light generating element (LGij).

Abstract: A matrix display comprises a matrix of optically addressable pixels (Pij). The pixels (Pij) comprise a light sensitive element (LSij) having a state depending on a brightness of control light (Lj) impinging on it. The pixels (Pij) further comprise a pixel light generating element (LGij) for generating pixel light (LMij) with a brightness depending on the state of the light sensitive element (LSij). The matrix display device comprises a sheet of transparent material (TS) positioned in front of the matrix of pixels (Pij), and a light source (LS) which couples source light into a side of the sheet of transparent material (TS). In use, the source light is substantially totally internally reflected in said sheet (TS). The control light (Lj) leaves the sheet (TS) at positions where the sheet (TS) is locally disturbed. This control light switches or changes the brightness of the pixels (Pij) at these positions, or provides touch position information.

Abstract: A three electrode PDP comprises a scan driver (SD) which supplies a substantially sine wave shaped voltage (VS) between first and the second scan electrodes (SEi, CEi), an amplitude of the substantially sine wave shaped voltage (VS) being large enough to sustain plasma cells (PCij), but being too small to ignite the plasma cells (PCij). A data driver (DD) supplies a substantially pulse shaped voltage (VD) to the data electrodes (DEi) for controlling an amount of light produced by the plasma cells (PCij). The sine wave shaped voltage may have a predetermined frequency such that more than one stable light output level is obtained.

Abstract: The invention relates to an AC plasma display panel (12) of the surface discharge type, and more specifically to the structure of the address electrodes (5) of the panel and of the phosphor elements, and to a plasma display panel device comprising such a panel. According to the invention, only one address electrode (5) is used for one out of every two columns. Scan electrodes (8) and common electrodes (7) may comprise transparent parts (11). These parts (11) may extend over one out every two cells in a checkerboard fashion. In a preferred embodiment, the columns may have alternating wide (15) and narrow (16) cells (2). Furthermore, each cell has a neighbor-cell of the same color on the same address electrode but in a neighboring column and in a neighboring row. The display panel device comprises a driving circuit (22) arranged such that in at least one of the sub-fields the neighboring cells are addressed simultaneously.

Abstract: In a flatpanel display apparatus comprising plasma discharge cells (c) having sustain electrodes (Su) and scan electrodes (Sc), a drive circuit having a circuit (23) for providing data to the discharge cells (c) incorporating an energy recovery circuit and means for activating the energy recovery circuit is provided. The data supplied to the discharge cells (c) is arranged in subfields, and the means for activating the energy recovery circuit activate the energy recovery circuit only for a part of the total number of subfields.