Abstract: A device (1) for decrypting encrypted images comprises an array of sensor elements (11) for sensing a first image, for example an encrypted image, and an array of display elements (12) for displaying a second image, for example a decrypted image. At least some display elements comprise integrated sensor elements, thus reducing the number of parts of the device. The integrated display/sensor elements (13) may be constituted by polymeric LED elements. The sensor function of the integrated elements may also be used for positioning the device relative to a terminal, and/or for checking a biometric feature of the user.

Abstract: A display device has an array of display elements (2) each driven by an input provided on a data conductor (6). These inputs are generated by data conductor addressing circuitry (9) which has a plurality of controllable driver circuits (32,34,40), each for providing an input to an associated data conductor. The number of controllable driver circuits is at least one greater than the number required for providing data to all data conductors. A reference driver circuit (30) is used for calibrating at least one of the controllable driver circuits whilst the other controllable driver circuits provide inputs to the data conductors. This provides a reduction in the spread of driver circuit outputs by calibration of the driver circuits using a reference driver circuit.

Abstract: The invention relates to an electric device comprising at least one organic diode, wherein said electric device comprises driving means for driving said organic diode in at least a light sensing state and pre-pulse means for applying one or more electrical pulses to said organic diode prior to driving said organic diode in said light sensing state. A positive electric pre-pulse has been observed to improve the light sensitivity of the organic diode, whereas a negative pre-pulse was found to decrease the time that the organic diode is in the light sensing state for accurately measuring or sensing incident light.

Abstract: The invention relates to a display device comprising a plurality of light emitting elements (1), wherein at least one of the elements has an associated capacitor (C1). The display device comprises pre-charging means (7;8) for generating a pre-charge signal for charging the associated capacitor (C1) at least partly. The pre-charging means (7;8) are adapted for generating a pre-charge signal comprising at least a first pre-charge signal in a first pre-charge stage and a second pre-charge signal in a second pre-charge stage. The pre-charge signal preferably comprises a current pre-charge signal followed by a voltage pre-charge signal. The combined pre-charge signal has the advantage of fast, but accurate pre-charging.

Abstract: In a driver for a luminescent display feedback techniques, in particular techniques using a control amplifier (25), are used to reduce the power supply voltage.

Abstract: The present invention is directed towards a method of scanning lines in a display and towards a display control device for scanning lines in a way which is less trackable by the human eye as well as towards an electronic device including such a display control device. The control device includes a line driving unit (18,20) and a control unit (22), which control unit (22) varies the selection of lines to be scanned and controls the line driving unit (18,20) to scan the selected lines. Selection and scanning is varied in such a way that energy variations caused by the scanning of lines is less trackable by the human eye. In this way bright lines or flickering normally caused by scanning of lines is reduced.

Abstract: This invention relates to a display device (5) comprising first and a second sub-pixel (5a, 5b), said first sub-pixel (5a) emitting light of a first wavelength (?1) and said second sub-pixel (5b) emitting light of a second wavelength (?2), said first sub-pixel (5a) comprising a first organic electroluminescent layer (1a), such as a polymer or a small-compound molecule layer, which is sandwiched between a front and a back electrode (2a, 3a), with a first state in which an emission driving signal (Val) is applied across said first layer (1a) for generating an emission state in which light of said first wavelength (?1) is emitted, and with a second state in which a sensing driving signal (Vas) is applied across said first layer (1a), whereby light of said second wavelength (?2) incident on said first sub-pixel (5a) can be detected. Preferably, said first electrodes (2a, 3a) are held at essentially the same potential.

Abstract: This invention relates to a method of driving a dual-function light-emitting and light-sensing device (5) comprising an organic electroluminescent layer (1), such as a polymer layer or a small molecule compound layer, which is sandwiched between a first and a second electrode (2,3), comprising the following steps:—applying, during a emission state (t1), a first emission signal (V1, J1) to said electroluminescent layer (1), said first signal being such that light is generated by and emitted from said electroluminescent layer (1), and—applying, during a sensing state (t2), a second driving signal (V2,J2) to said organic electroluminescent layer (1), said second driving signal being such that the power of said second driving signal has essentially a zero value for accurately detecting an electric current generated in said organic electroluminescent layer when said organic electroluminescent layer is hit by external light This invention also relates to a dual-function light-emitting and light-sensing device and a