Koninklijke Philips Corporation N.v.

Fransiscus Jacobus Vossen

Roel Van Woudenberg

Jurgen Jean Louis Hoppenbrouwers

Age Jochem Van Dalfsen

Alphonsus Maria Van Amesfoort

An active matrix display comprises a select driver (SD) to drive select electrodes (SE), and a data driver (DD) to supply data (D) to data electrodes (DE). Pixels () are associated with intersections of the data electrodes (DE) and the select electrodes (SE). The pixels () comprise a light emitting element (L) and a pixel driving circuit (PD). The pixel driving circuit (PD) receives a power supply voltage (VB) via a power supply electrode (PE), and data (D) via a data electrode (DE) to control a brightness of the light emitting element (L). A power supply (PS) supplies the power supply voltage (VB). The power supply electrodes (PE) are arranged to supply the power supply voltage (VB) to the pixel driving circuits (PD) of lines of pixels () extending in the same direction as the select electrodes (SE) or in the same direction as the data electrodes (DE). The load (AL; MA; IL) on the power supply electrodes (PE) caused by the pixels () associated with the lines of pixels () is determined (LL), and the level of the power supply voltage (VB) is controlled (CO) dependent on the load (AL; MA; IL).

Active matrix display with reduction of power consumption

A full-bridge driver circuit comprising four controllable switches supplies a voltage having alternating polarities between a first and a second electrode of a flat panel display. A series arrangement of a capacitance present between the first and a second electrode, an inductor, and a diode, is arranged in parallel with one of the switches. The diode is poled to be conductive during a resonance phase. The control circuit closes one of the switches so that the inductor and the capacitance form a resonant circuit to reverse the polarity of the voltage in an energy-efficient way without requiring any other controllable switches than the ones forming the full-bridge driver circuit.

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Eindhoven, Netherlands

Fransiscus Jacobus Vossen