Display device comprising a plurality of leds
OwnerMark Thomas Johnson, Johannes Nicolaas Huiberts +1inventors
InventorsMark Thomas Johnson, Johannes Nicolaas Huiberts, Andrea Giraldo
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Abstract
The invention relates to a display device comprising a plurality of light-emitting diodes (LEDs), which comprise at least one layer of an electroluminescent (EL) material sandwiched between electrodes, and driving means for driving the diodes. The device further comprises means for applying a reverse voltage to one or more individual diodes or groups of diodes and means for measuring the leakage current resulting from this reverse voltage. The invention also relates to a method of manufacturing such a display device and to an electronic device, such as a mobile telephone or an organiser, comprising such a display device.
Claims13
A display device comprising a plurality of light-emitting diodes (5), which comprise at least one layer (2) of an electroluminescent material sandwiched between electrodes (3,4), and driving means (1) for driving the diodes (5), characterized in that the device comprises means (6) for applying a reverse voltage to one or more individual diodes (5) or groups of diodes (5) and means (11) for measuring the leakage current resulting from this reverse voltage.
A display device as claimed in any one of the preceding claims, wherein the driving means (1) are arranged to reduce the load on diodes (5) or groups of diodes (5), of which the leakage current or said parameter, respectively, exceeds a predetermined threshold value.
A display device as claimed in any one of the preceding claims, wherein the means (6) for applying a reverse voltage, the means (11) for measuring the leakage current resulting from this reverse voltage, and/or the memory unit (12) are integral parts of the driving means (1).
A method of manufacturing a display device comprising a plurality of light-emitting diodes (5), which comprise at least one layer (2) of an electroluminescent material sandwiched between electrodes (3,4), and driving means (1) for driving the diodes (5), characterized in that individuals diodes (5) or groups of diodes (5) are subjected to a reverse voltage, and in that the leakage current, leakage current instability or a value derived from one or both of these quantities resulting from this reverse voltage is measured and compared with a predetermined threshold value.
Dependencies are inferred from the claim text.