OLED display with aging compensation

A method for controlling an OLED display device having addressable OLED pixels on a substrate, the OLED pixels having performance attributes, and a control circuit for controlling the OLED pixels of the OLED display, comprising the steps of:

• a) providing one or more OLED pixels;
• b) providing an OLED reference pixel located on a substrate and connected to the control circuit, the OLED reference pixel having the same performance attributes as the one or more OLED pixels, the OLED reference pixel having a voltage sensing circuit including a transistor connected to one of the terminals of the OLED reference pixel for sensing the voltage across the OLED reference pixel to produce a voltage signal representing the voltage across the OLED reference pixel;
• c) measuring the voltage signal to produce an output signal representative of the performance attributes of the OLED reference pixel;
• d) receiving the output signal, comparing the performance attributes with predetermined performance attributes, and producing a feedback signal in response thereto;
• and
• e) controlling the OLED display in response to the feedback signal by calculating a corrected control signal for controlling the OLED pixels and employing the corrected control signal to control the OLED pixels to thereby compensate for the changes in the output of the OLED pixels.