Abstract: A device includes a matrix of active pixels, with each active pixel having an OLED diode having a cathode to receive a cathode voltage, and a control circuit coupled to an anode of the OLED diode. The device also includes at least one dummy pixel having a dummy OLED diode having a cathode to receive the cathode voltage, and an anode, and a dummy control circuit coupled to the anode of the OLED diode and having a power supply terminal. The dummy OLED diode and the dummy control circuit are substantially similar to the OLED diode and the control circuit. First regulation circuitry is configured to deliver a reference current to the power supply terminal to thereby generate a voltage, and second regulation circuitry is configured to regulate the cathode voltage so as to maintain the voltage at the power supply terminal at a given level.

Abstract: A device includes a matrix of active pixels, with each active pixel having an OLED diode having a cathode to receive a cathode voltage, and a control circuit coupled to an anode of the OLED diode. The device also includes at least one dummy pixel having a dummy OLED diode having a cathode to receive the cathode voltage, and an anode, and a dummy control circuit coupled to the anode of the OLED diode and having a power supply terminal. The dummy OLED diode and the dummy control circuit are substantially similar to the OLED diode and the control circuit. First regulation circuitry is configured to deliver a reference current to the power supply terminal to thereby generate a voltage, and second regulation circuitry is configured to regulate the cathode voltage so as to maintain the voltage at the power supply terminal at a given level.

Abstract: A device includes an OLED pixel and a control circuit controlled at a refresh rate thereof. The device includes first and second dummy control circuits having similar operating characteristics to the control circuit. A controller and logic circuit switch on the first and second dummy control circuits and apply an input voltage so the first and second dummy control circuits output first and second output voltages. At a first time, the controller and logic circuit switch off the second dummy control circuit so a leakage current flows through the second dummy control circuit to ground, causing the second output voltage to reduce. Comparison circuitry determines a second time at which, due to the reduction of the second output voltage, a difference between the first and second output voltages is greater than a threshold. Determination circuitry determines the refresh frequency based upon elapsed time between the first and second times.

Abstract: A device includes a matrix of active pixels, with each active pixel having an OLED diode having a cathode to receive a cathode voltage, and a control circuit coupled to an anode of the OLED diode. The device also includes at least one dummy pixel having a dummy OLED diode having a cathode to receive the cathode voltage, and an anode, and a dummy control circuit coupled to the anode of the OLED diode and having a power supply terminal. The dummy OLED diode and the dummy control circuit are substantially similar to the OLED diode and the control circuit. First regulation circuitry is configured to deliver a reference current to the power supply terminal to thereby generate a voltage, and second regulation circuitry is configured to regulate the cathode voltage so as to maintain the voltage at the power supply terminal at a given level.

Abstract: A device includes an OLED pixel and a control circuit controlled at a refresh rate thereof. The device includes first and second dummy control circuits having similar operating characteristics to the control circuit. A controller and logic circuit switch on the first and second dummy control circuits and apply an input voltage so the first and second dummy control circuits output first and second output voltages. At a first time, the controller and logic circuit switch off the second dummy control circuit so a leakage current flows through the second dummy control circuit to ground, causing the second output voltage to reduce. Comparison circuitry determines a second time at which, due to the reduction of the second output voltage, a difference between the first and second output voltages is greater than a threshold. Determination circuitry determines the refresh frequency based upon elapsed time between the first and second times.

Abstract: A device includes a matrix of active pixels, with each active pixel having an OLED diode having a cathode to receive a cathode voltage, and a control circuit coupled to an anode of the OLED diode. The device also includes at least one dummy pixel having a dummy OLED diode having a cathode to receive the cathode voltage, and an anode, and a dummy control circuit coupled to the anode of the OLED diode and having a power supply terminal. The dummy OLED diode and the dummy control circuit are substantially similar to the OLED diode and the control circuit. First regulation circuitry is configured to deliver a reference current to the power supply terminal to thereby generate a voltage, and second regulation circuitry is configured to regulate the cathode voltage so as to maintain the voltage at the power supply terminal at a given level.

Abstract: A control device for a matrix plasma display screen has a row driver circuit capable of sequentially selecting the rows of the matrix and a column driver circuit, for each column of the matrix, with an individual column driver unit that has at least a first transistor of the MOS type capable of emitting, towards each column of a desired set of columns, a state change signal in order to allow the transition of the set from a first state towards a second state, and a controller.

Abstract: A method and circuit to control a circuit for addressing at least one line electrode of a plasma display panel having, for each line, a line selection stage formed of two switches in series between two input terminals of the selection stage, the method including alternating use of the two switches of the selection stage of each line to flow a current from or to an inductive element of the addressing circuit without connecting the input terminals together.

Abstract: A method and circuit to control of a circuit for addressing at least one line electrode of a plasma display panel having, for each line, a line selection stage formed of two switches in series between two input terminals of the selection stage, the method including use of a first one of the two switches of the selection stage of each line to flow a current from or to an inductive element of the addressing circuit.

Abstract: A high-potential output stage includes an output circuit to power a load with a variable high potential when it receives a low-level active input logic signal. It also includes a driving circuit which produces a high-level control logic signal as a function of the input logic signal to drive the output circuit which is powered by a DC high potential. The output stage also synchronizes the input logic signal with variations of the variable high potential.

Abstract: A control device for a matrix plasma display screen has a row driver circuit capable of sequentially selecting the rows of the matrix and a column driver circuit, for each column of the matrix, with an individual column driver unit that has at least a first transistor of the MOS type capable of emitting, towards each column of a desired set of columns, a state change signal in order to allow the transition of the set from a first state towards a second state, and a controller.

Abstract: A method and circuit to control of a circuit for addressing at least one line electrode of a plasma display panel having, for each line, a line selection stage formed of two switches in series between two input terminals of the selection stage, the method including use of a first one of the two switches of the selection stage of each line to flow a current from or to an inductive element of the addressing circuit.

Abstract: The method is for controlling a plasma matrix screen, including sequential selection of rows of the matrix and, for a selected row, deselection of a plurality of columns of the matrix which were previously selected during the selection of a previous row. To avoid excessive steepness of the falling edges of the column potentials, the previously selected columns are non-simultaneously deselected.

Abstract: A high-potential output stage includes an output circuit to power a load with a variable high potential when it receives a low-level active input logic signal. It also includes a driving circuit which produces a high-level control logic signal as a function of the input logic signal to drive the output circuit which is powered by a DC high potential. The output stage also synchronizes the input logic signal with variations of the variable high potential.