Method of controlling an electroluminescent display and related control circuit

A control circuit for generating upper and lower voltages for controlling an electroluminescent component, the control circuit comprising:

• a pair of amplifiers coupled together at a first input terminal and configured to generate the upper voltage and the lower voltage to correspond to a difference between a common voltage at the first input terminal and, respectively, threshold values of the upper voltage and of the lower voltage;
• and
• an auxiliary amplifier configured to
• adjust the upper voltage and the lower voltage based upon fluctuations of an input voltage, and
• generate the common voltage to correspond to the difference between the input voltage and a reference voltage.

An electroluminescent display comprising:

• an array of pixel circuits, each pixel circuit comprising
• an electroluminescent component,
• a driving transistor comprising a control terminal and configured to couple said electroluminescent component to a supply voltage, and
• a switching transistor configured to couple the control terminal of said driving transistor to a data voltage;
• a control circuit configured to generate upper voltage and lower voltages that define a range of the data voltage;
• and
• a generator configured to
• receive the upper voltage, the lower voltage, and a command representing a quantized level of the range, and
• generate the data voltage to correspond to the quantized level;
• said control circuit comprises
• a pair of amplifiers coupled together at a first input terminal and configured to generate the upper voltage and the lower voltage to correspond to a difference between a common voltage at the first input terminal and, respectively, threshold values of the upper voltage and of the lower voltage;
• and
• an auxiliary amplifier configured to
• adjust the upper voltage and the lower voltage based upon fluctuations of an input voltage, and
• generate the common voltage to correspond to the difference between the input voltage and a reference voltage.

An electroluminescent display comprising:

• an array of pixel circuits, each pixel circuit comprising an electroluminescent component, and a driving transistor comprising a control terminal configured to receive a data voltage and configured to couple said electroluminescent component to a supply voltage;
• a control circuit configured to generate upper voltage and lower voltages that define a range of the data voltage;
• and
• said control circuit comprises
• a pair of amplifiers coupled together at a first input terminal and configured to generate the upper voltage and the lower voltage to correspond to a difference between a common voltage at the first input terminal and, respectively, threshold values of the upper voltage and of the lower voltage;
• and
• an auxiliary amplifier configured to
• adjust the upper voltage and the lower voltage based upon fluctuations of an input voltage, and
• generate the common voltage to correspond to the difference between the input voltage and a reference voltage.

A method of operating a control circuit for generating upper and lower voltages for controlling an electroluminescent component, the method comprising:

• using a pair of amplifiers coupled together at a first input terminal to generate the upper voltage and the lower voltage to correspond to a difference between a common voltage and, respectively, threshold values of the upper voltage and of the lower voltage;
• and
• using an auxiliary amplifier to
• adjust the upper voltage and the lower voltage based upon fluctuations of an input voltage, and
• generate the common voltage to correspond to the difference between the input voltage and a reference voltage.