Display systems with compensation for line propagation delay
AssigneeIgnis Innovation Inc.
InventorsGholamreza Chaji, Yaser Azizi
Life of this patent
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Abstract
A method for characterizing and eliminating the effect of propagation delay on data and monitor lines of AMOLED panels is introduced. A similar technique may be utilized to cancel the effect of incomplete settling of select lines that control the write and read switches of pixels on a row.
Claims11
A method of extracting a propagation delay effect in a display system having a pixel circuit to allow the pixel circuit sufficient time during a programming budget to settle, the pixel circuit having a light emitting device driven by a driving transistor, the pixel circuit connected to a signal line for providing programming information to the pixel circuit for influencing the current through the driving transistor and a monitor line for measuring current levels through at least the driving transistor, the method comprising:
- first programming the pixel circuit with a first time duration sufficient to avoid settling effects on the signal line;
- responsive to the first programming, measuring, from the monitor line, a current from the pixel circuit to produce a first measurement;
- second programming the pixel circuit with a second time duration different from the first time duration;
- responsive to the second programming, measuring, from the monitor line, a current from the pixel circuit to produce a second measurement;
- comparing the first measurement and the second measurement to extract a propagation delay effect on the signal line;
- and
- storing a representation of the extracted propagation delay effect in a memory device.
Dependencies are inferred from the claim text.