Active matrix electroluminescent display device
AssigneeKoninklijke Philips Electronics N.V.
InventorMartin J. Edwards
Life of this patent
Estimating the term…
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′).
Claims18
An active matrix electroluminescent display device comprising an array of display pixels arranged in rows and columns, each pixel comprising an electroluminescent display element and a switching means for controlling the current through the display element based on a signal voltage applied to the pixel, each row of pixels sharing a common line, currents through the display elements of a row of pixels passing along the common line, different voltages thereby being present at different points along the common line;
- and
- driver circuitry for generating signal voltages corresponding to desired outputs from the display elements, and for applying signal voltages to rows of pixels in sequence, characterized in that the device further comprises:
- means for generating error values for each pixel in a row of pixels to be addressed, to compensate for said different voltages in said common line, derived from a circuit representing an additional row of pixels and associated with the driver circuitry, and to which the signal voltages for the row of pixels to be addressed are applied;
- means for updating the signal voltages for each pixel in the row of pixels to be addressed, where required, using the error values;
- and
- means for supplying the updated signal voltages to the pixels.
A method of driving an active matrix electroluminescent display device comprising an array of electroluminescent display pixels arranged in rows and columns, each row of pixels sharing a common line, currents through the display pixels of a row passing along the common line, different voltages thereby being present at different points along the common line, the method comprising addressing rows of pixels in sequence, and for each row of pixels generating voltage signals for the pixels in the row, the generated voltage signals corresponding to desired pixel outputs, characterised in that the method further comprises:
- generating error values based on the effect of the voltage signals on a circuit representing an additional row of pixels;
- updating the signal voltages for each pixel in the row, where required, using the error values;
- and
- supplying the updated signal voltages to the pixels.
Dependencies are inferred from the claim text.