OLED display with aging compensation
First Claim
1. A method of compensating image signals for driving an OLED display having a plurality of light-emitting elements having outputs that change with time or use, comprising the steps of:
- a) obtaining a measured or estimated first value of the current used by individual light-emitting elements in response to known image signals at a first time;
b) specifying multiple groups of light-emitting elements at a second time, wherein at least one of the specified groups contains at least one light-emitting element common to another specified group;
c) measuring total currents used by each of the specified groups in response to known image signals at a second time;
d) forming an estimated second value of the current used by individual light-emitting elements based on the measured total currents;
e) calculating correction values for individual light-emitting elements based on the difference between the first and second current values; and
f) employing the correction values to compensate image signals for the changes in the output of the light-emitting elements and produce compensated image signals.
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Accused Products
Abstract
A method of compensating image signals for driving an OLED display having a plurality of light-emitting elements having outputs that change with time or use, comprising the steps of: a) obtaining a measured or estimated first value of the current used by individual light-emitting elements in response to known image signals at a first time; b) specifying multiple groups of light-emitting elements at a second time, wherein at least one of the specified groups contains at least one light-emitting element common to another specified group; c) measuring total currents used by each of the specified groups in response to known image signals at a second time; d) forming an estimated second value of the current used by individual light-emitting elements based on the measured total currents, e) calculating correction values for individual light-emitting elements based on the difference between the first and second current values, and f) employing the correction values to compensate image signals for the changes in the output of the light-emitting elements and produce compensated image signals.
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Citations
20 Claims
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1. A method of compensating image signals for driving an OLED display having a plurality of light-emitting elements having outputs that change with time or use, comprising the steps of:
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a) obtaining a measured or estimated first value of the current used by individual light-emitting elements in response to known image signals at a first time;
b) specifying multiple groups of light-emitting elements at a second time, wherein at least one of the specified groups contains at least one light-emitting element common to another specified group;
c) measuring total currents used by each of the specified groups in response to known image signals at a second time;
d) forming an estimated second value of the current used by individual light-emitting elements based on the measured total currents;
e) calculating correction values for individual light-emitting elements based on the difference between the first and second current values; and
f) employing the correction values to compensate image signals for the changes in the output of the light-emitting elements and produce compensated image signals. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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19. An OLED display having, comprising:
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a) a plurality of light-emitting elements having outputs that change with time or use;
b) a current measuring device for sensing the total current used by the display to produce current signals; and
c) a controller for specifying multiple groups of light-emitting elements, wherein at least one of the specified groups contains at least one light-emitting element common to another specified group, for activating the specified groups of light-emitting elements in response to known image signals, and responsive to the current signals for calculating correction values for the light-emitting elements in each group, and for applying the correction values to image signals to produce compensated image signals that compensate for the changes in the output of the light-emitting elements of each group with time or use. - View Dependent Claims (20)
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Specification