Power supply line voltage drop compensation for active matrix displays

Driving system circuitry for an active matrix display comprises: a data driver module for receiving a digital data bit stream representing an image to be displayed by pixels of the active matrix display, one or more power supply lines for powering a plurality of pixels each comprising at least one light emitting element, a voltage source connected to the one or more power supply lines, and calibration means for compensating for power drop over the one or more supply lines. The calibration means comprise means for flowing a current through an individual pixel, means for determining a voltage drop across the pixel and for comparing this to a pre-determined reference voltage for that pixel, means for determining, from the comparison, calibration values for that pixel which take into account resistance of wiring connected to the voltage source and to ground, and means for applying the calibration values to a received digital data bit stream to generate therefrom data driver voltages to be applied to the data driver module for representation of a corrected image.

Octrooi-publicatienummer: EP3319075

Jaar aanvraag: 2016

Jaar toekenning: 2019

Jaar van publicatie: 2018

Status: Aangevraagd

Technologiedomeinen: Audiovisuele technologie

Gevalideerd voor IOF-sleutel: Ja

Toegewezen aan: Associatie KULeuven