Electroluminescent display devices
First Claim
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1. An active matrix electroluminescent display device comprising an array of display pixels, each pixel comprising:
- an electroluminescent display element and a drive transistor for driving a current through the display element;
a first switch enabling power from a power supply line to be supplied to the display element;
a second switch for routing current from a current-measurement supply line to the display element, the first and second switches being operated in complementary manner;
a control line for controlling the gate voltage applied to the drive transistor, andan address transistor connected between the control line and the gate of the drive transistor wherein a feedback system is provided between the current-measurement supply line and the control line.
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Abstract
An active matrix electroluminescent display device comprises an array of display pixels. In each pixel, a first switch connects power from a power supply line to the display element and a second switch routes current from a current-measurement supply line to the display element. The gate voltage applied to a drive transistor is controlled by a feedback system, such that control voltage is controlled in closed loop manner to achieve the desired current. The control voltage can then be used for subsequent addressing of the pixel.
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Citations
10 Claims
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1. An active matrix electroluminescent display device comprising an array of display pixels, each pixel comprising:
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an electroluminescent display element and a drive transistor for driving a current through the display element; a first switch enabling power from a power supply line to be supplied to the display element; a second switch for routing current from a current-measurement supply line to the display element, the first and second switches being operated in complementary manner; a control line for controlling the gate voltage applied to the drive transistor, and an address transistor connected between the control line and the gate of the drive transistor wherein a feedback system is provided between the current-measurement supply line and the control line. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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Specification