US 7,321,348 B2 | ||
OLED display with aging compensation | ||
Ronald S. Cok, Rochester, N.Y. (US); Thomas Niertit, Webster, N.Y. (US); and Andrew D. Arnold, Hilton, N.Y. (US) | ||
Assigned to Eastman Kodak Company, Rochester, N.Y. (US) | ||
Filed on Nov. 13, 2003, as Appl. No. 10/712,337. | ||
Application 10/712337 is a continuation in part of application No. 09/577241, filed on May 24, 2000, abandoned. | ||
Prior Publication US 2004/0070558 A1, Apr. 15, 2004 | ||
Int. Cl. G09G 3/32 (2006.01) |
U.S. Cl. 345—82 [345/208; 345/211] | 32 Claims |
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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