Optics: measuring and testing – Photometers – Photoelectric
Reexamination Certificate
2007-11-27
2007-11-27
Pham, Hoa Q. (Department: 2877)
Optics: measuring and testing
Photometers
Photoelectric
C315S169300, C345S077000, C345S082000
Reexamination Certificate
active
11093115
ABSTRACT:
A method for the correction of average brightness or brightness uniformity variations in OLED displays comprising: a) providing an OLED display having one or more light-emitting elements responsive to a multi-valued input signal for causing the light-emitting elements to emit light at a plurality of brightness levels; b) measuring the brightness of each light-emitting element at two or more, but fewer than all possible, different input signal values; c) employing the measured brightness values to estimate a maximum input signal value at which the light-emitting element will not emit more than a predefined minimum brightness and the rate at which the brightness of the light-emitting element increases above the predefined minimum brightness in response to increases in the value of the input signal; and d) using the estimated maximum input signal value at which the light-emitting element will not emit light more than the predefined minimum brightness and the rate at which the brightness of the light-emitting element increases above the predefined minimum brightness in response to increases in the value of the input signal to modify the input signal to a corrected input signal to correct the light output of the light-emitting elements.
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Cok Ronald S.
Ford James H.
Anderson Andrew J.
Eastman Kodak Company
Pham Hoa Q.
Shaw Stephen H.
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