Device comprising a matrix of active OLED pixels with brightness adjustment, and corresponding method

摘要

A device includes a matrix of active pixels. Each active pixel includes an OLED and a control circuit configured to refresh the active pixel and including at least one transistor having a first conduction terminal coupled to a supply line and a second conduction terminal coupled to the OLED. Supply circuitry is configured to apply a supply voltage to the supply line of each active pixel during the refreshing of the active pixel and for a time period less than a duration of the refreshing of the active pixel.

主权项

1. A device, comprising:
a matrix of active pixels organized into rows and columns, each active pixel comprising:
a supply line,an OLED,a control circuit configured to refresh the active pixel and including
a first transistor having a first conduction terminal coupled to the supply line, a second conduction terminal coupled to the OLED, and a control terminal;a second transistor having a first conduction terminal coupled to control the first transistor via the control terminal of the first transistor, a second conduction terminal coupled to receive a sampling and maintenance line, and a control terminal; supply circuitry comprising, for each row, a flip-flop having a first input receiving a row selection voltage and a second input receiving a supply stopping voltage configured to stop supply of a supply voltage to first conduction terminals of first transistors of active pixels of that row; wherein the supply circuitry is configured to apply the row selection voltage to the control terminal of each second transistor of its respective row during the refreshing of the active pixels thereof; wherein the flip-flop is configured to apply the supply voltage to the supply line of each active pixel of its respective row from a moment of application of the row selection voltage and for a time period dependent on an elapsed time required for a given number of rows of the matrix to successively receive the row selection voltage at control terminals of their second transistors.