Video wall, driver circuits, controls and method thereof

Arrangement comprising:

• a device for the electronic control of a LED pixel cell, in particular created with NMOS technology, comprising:
• a data signal line, a threshold signal line and a selection signal line;
• an LED electrically connected in series with a dual-gate transistor and together with the latter between a first and a second potential terminal;
• wherein the dual-gate transistor is arranged with its current line contacts between a terminal of the LED and a potential terminal, and a first control gate of the dual-gate transistor is connected to the threshold line;
• a select hold circuit having a charge storage device coupled to a second control gate of the dual gate transistor and to a current line contact of the dual gate transistor, and a control transistor having its control terminal connected to the select signal line;
• and/or
• a driver circuit for driving a plurality of optoelectronic elements, comprising:
• a plurality of first memory cells each comprising a set input, a reset input, and an output,
• wherein each first memory cell is triggered to a first state at the output by a set signal at the set input and holds the first state until reset to a second state at the reset input, and
• wherein the output of each first memory cell is configured to control a respective one of the optoelectronic elements;
• and/or
• a supply circuit, comprising:
• an error correction detector with a reference signal input, an error signal input and a correction signal output;
• a controllable current source having a current output and a control signal terminal, the control signal terminal being connected to the correction signal output to form a control loop for the controllable current source, wherein the current source is adapted to provide a current at the current output in response to a signal at the control signal terminal;
• a substitute source having an output adapted to provide a substitute signal;
• a switching device which is designed to supply, as a function of a switching signal, either a signal derived from the current at the current output or the substitute signal to the error signal input with additional isolation of the current output from the current source;
• and/or
• a control circuit for a display matrix comprising a plurality of light emitting devices arranged in rows and columns, comprising:
• a row selection input for a row selection signal and a column data input for a data signal;
• a ramp signal input for a ramp signal having a level between a first value and a second value and a trigger input for a trigger signal;
• a column data buffer configured to buffer the data signal in response to the row select signal;
• a pulse generator coupled to the column data buffer and the ramp signal input and configured to provide a buffered output signal to control the on/off ratio of at least one of the plurality of light emitting devices in response to the trigger signal, the data signal, and the ramp signal;
• and/or
• a display arrangement having a display comprising a plurality of pixels arranged in rows and columns, comprising:
• a first substrate structure with LEDs arranged therein or applied thereto, which form the pixel structure arranged in rows and columns, wherein
• the LEDs are individually controllable;
• and
• a plurality of contacts are arranged on the surface of the first substrate structure opposite to a light emission direction;
• a second substrate structure comprising on a surface a plurality of contacts corresponding to the contacts of the first substrate structure and having a plurality of digital circuits for addressing the optoelectronic devices;
• wherein the first and second substrate structures are interconnected and the plurality of contacts are electrically connected to the corresponding contacts;
• and
• wherein the first substrate structure is formed with a first material system and the second substrate structure is formed with a second material system different therefrom;
• and/or
• a control circuit for adjusting a brightness of at least one LED, comprising a current driving element having
• a control terminal whose first terminal is connected to a first potential;
• a charge accumulator connected between the control terminal and the first potential and forming a capacitive voltage divider with a defined capacitance between the control terminal and the first terminal;
• a control element configured to apply a control signal to the control terminal during a first time period, based on which a current flowing through the at least one LED is adjustable during the first time period;
• wherein during a second time period subsequent to the first time period, a current flowing through the LED is determined by a reduced control signal formed by the control signal during the first time period and the capacitive voltage divider;
• and
• the control element is arranged to provide a first or a second control signal during the first time period to operate the LED at at least two different brightness levels.