OLED display with aging compensation
First Claim
1. An organic light-emitting diode (OLED) display system having addressable pixels on a substrate, the pixels having performance attributes, and a control circuit for controlling the pixels of the display device, comprising:
- a) an array of OLED pixels forming a display device;
b) an additional OLED reference pixel external to the display device and located on a common substrate with the display device, and connected to the control circuit, the additional OLED reference pixel having the same performance attributes as the OLED pixels, the additional OLED reference pixel having a voltage sensing circuit including a transistor connected to one of the terminals of the additional OLED reference pixel for sensing the voltage across the additional OLED reference pixel to produce a voltage signal representing the voltage across the additional OLED reference pixel;
c) a measurement circuit connected to the voltage signal that represents the voltage across the additional OLED reference pixel to produce an output signal representative of the performance attributes of the additional OLED reference pixel;
d) an analysis circuit connected to the measurement circuit to receive the output signal, compare the performance attributes with predetermined performance attributes, and produce a feedback signal in response thereto; and
e) the control circuit being responsive to the feedback signal to compensate for changes in the output of the array of OLED pixels.
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Accused Products
Abstract
An organic light-emitting diode (OLED) display having addressable pixels on a substrate, the pixels having performance attributes, and a control circuit for controlling the pixels of the display device, includes one or more OLED pixels; 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; a measurement circuit connected to the voltage signal to produce an output signal representative of the performance attributes of the OLED reference pixel; an analysis circuit connected to the measurement circuit to receive the output signal, compare the performance attributes with predetermined performance attributes, and produce a feedback signal in response thereto; and the control circuit being responsive to the feedback signal to compensate for changes in the output of the OLED pixels.
317 Citations
32 Claims
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1. An organic light-emitting diode (OLED) display system having addressable pixels on a substrate, the pixels having performance attributes, and a control circuit for controlling the pixels of the display device, comprising:
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a) an array of OLED pixels forming a display device; b) an additional OLED reference pixel external to the display device and located on a common substrate with the display device, and connected to the control circuit, the additional OLED reference pixel having the same performance attributes as the OLED pixels, the additional OLED reference pixel having a voltage sensing circuit including a transistor connected to one of the terminals of the additional OLED reference pixel for sensing the voltage across the additional OLED reference pixel to produce a voltage signal representing the voltage across the additional OLED reference pixel; c) a measurement circuit connected to the voltage signal that represents the voltage across the additional OLED reference pixel to produce an output signal representative of the performance attributes of the additional OLED reference pixel; d) an analysis circuit connected to the measurement circuit to receive the output signal, compare the performance attributes with predetermined performance attributes, and produce a feedback signal in response thereto; and e) the control circuit being responsive to the feedback signal to compensate for changes in the output of the array of OLED pixels. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. A method for controlling an OLED display device having an array of addressable OLED pixels on a substrate, the OLED pixels having performance attributes, and a control circuit for controlling the array of OLED pixels of the OLED display, comprising the steps of:
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a) providing an additional OLED reference pixel, external to the display device, and located on the substrate and connected to the control circuit, the additional OLED reference pixel having the same performance attributes as the OLED pixels in the array, the additional OLED reference pixel having a voltage sensing circuit including a transistor connected to one of the terminals of the additional OLED reference pixel for sensing the voltage across the additional OLED reference pixel to produce a voltage signal representing the voltage across the additional OLED reference pixel; b) measuring the voltage signal to produce an output signal representative of the performance attributes of the additional OLED reference pixel; c) receiving the output signal, comparing the performance attributes with predetermined performance attributes, and producing a feedback signal in response thereto; and d) controlling the OLED display in response to the feedback signal by calculating a corrected control signal for controlling the OLED pixels in the array and employing the corrected control signal to control the OLED pixels in the array to thereby compensate for the changes in the output of the OLED pixels in the array. - View Dependent Claims (19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32)
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Specification