Abstract: The invention relates to a method of and a device for compensating tilt of an optical or magneto-optical disc (1) exhibiting unknown tilt when placed in an apparatus for reading and/or writing data from and/or onto the optical or magneto-optical disc. A holographic optical element (23) containing a plurality of holograms each defining a phase profile able to compensate at least a specific coma amount is placed in a light path of an optical read/write unit (4) of the apparatus. The amount of tilt of the disc or coma introduced by the tilt is detected (14, 21), and a hologram defining a phase profile corresponding to the detected amount of tilt or coma is selected and accessed among the plurality of holograms of the holographic optical element for compensating the detected amount of tilt or coma. The invention applies to any type of optical data carrier such as so-called LD, CD, R-CD, DVD, DVD+R, DVD+RW, DVD-RW, DVR (Blue Ray).

Abstract: The present invention relates to an optical scanning device for reading and/or writing on a plurality of tracks on an optical storage medium (1), said scanning device comprising optical means (17) for focusing a plurality of beams, after being reflected from said medium, onto an observation plane (22), and for introducing astigmatism into at least one of said reflected beams, and a photo-detector (18) comprising a plurality of detector segments, arranged in said observation plane (22) to receive said at least one astigmatic reflected beam.

Abstract: A method is provided for modulating the output of a high-power diode laser device (SL) using an injected light signal from a low-power diode laser device (ML). The output of the high-power device (SL) is wavelength modulated by the input signal from the low-power device (ML). In addition, a new optical storage write mechanism is proposed which uses the wavelength modulation technique. Wavelength dependence of the absorption of the recording layer of an optical disc translates the diode laser wavelength modulation into variations of the absorption.

Abstract: The invention relates to a system for reading data stored on an information carrier (201), said system comprising: an optical element (202) for generating an array of light spots (203) from an input light beam (204), said array of light spots (203) being intended to scan said information carrier (201), a detector (205) for detecting said data from an array of output light beams generated by said information carrier (201) in response of said array of light spots (203).

Abstract: For displaying a target image contained in a sequence of first images (11) interspersed with second images (12) constituting a masking image, a display device is arranged for substantially exclusively displaying the first images and suppressing the second images in response to a key (13). The display device may be provided with an LCD screen which is only illuminated when first images are displayed. Color coding may be used to further enhance the security of the device.

Abstract: This invention relates to an electroluminescent display device (10) comprising D transmissive front substrate (11) and at least a first and a second light-emitting element (12, 15b), wherein said first element (12) is arranged to emit light at a first wavelength (?1) and said second element (15b) is arranged to emit light at a second wavelength (?2). Furthermore, a first absorbing layer (18), arranged to absorb light of said second wavelength (?2) and transmit light of said first wavelength (?1) is arranged between said first light-emitting element (12) and said front substrate (11).

Abstract: The invention relates to a device, such as an electro-luminescent display device, comprising a substrate, first electrodes which are arranged over the substrate, second electrodes which are arranged over the first electrodes and at least one electrically insulating structure which separates two of the second electrodes and is arranged over at least one of the first electrodes. The insulating structure comprises an opening which extends from the top surface of the structure to the first electrode beneath the structure. The invention further relates to a method of manufacturing such a device. In one preferred embodiment, this method involves the use of sacrificial structures with which openings are obtained the upper parts of which extend along the entire length of the respective insulating structures.

Abstract: An optical readout device for reading out data from an electroluminescent data storage medium, comprising: a driving circuit (4) for driving the radiation-emitting material with a time-varying applied signal; a radiation detector array (6) for detecting radiation emitted from the data storage medium and for generating radiation detection signals; and a processing part (8) arranged to process the detection signals to distinguish a detection signal resulting from reading different types of marks in the data storage medium in dependence on a timing reference signal.