Circuit and method for driving an array of light emitting pixels
First Claim
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1. A pixel circuit for use in a display, the display comprising a plurality of pixels with each pixel having a select line, a signal line, and a feedback line, each of the pixels comprising:
- a light emitting element;
a drive part for providing a drive current to the light emitting element, the drive part having a storage capacitor, a switch use transistor, a drive use transistor, and a feedback transistor; and
an on-pixel feedback conductive path between the drive use transistor and a reference potential for generating a feedback voltage representing a drive current provided to the light emitting element, the feedback voltage being provided to the feedback line via the feedback transistor; and
a reference circuit providing reference signals to the on-pixel feedback conductive path for improving the light output characteristics and compensating for different factors that can cause instability or non-uniformity.
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Abstract
A technique for driving a column of pixels that include light emitting elements. The technique incorporates feedback data provided from feedback data sources connected to the data line and to feedback line of the array, pixel driving circuit with feedback path. The technique can also include block of the reference elements for input signal corrections.
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Citations
23 Claims
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1. A pixel circuit for use in a display, the display comprising a plurality of pixels with each pixel having a select line, a signal line, and a feedback line, each of the pixels comprising:
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a light emitting element; a drive part for providing a drive current to the light emitting element, the drive part having a storage capacitor, a switch use transistor, a drive use transistor, and a feedback transistor; and an on-pixel feedback conductive path between the drive use transistor and a reference potential for generating a feedback voltage representing a drive current provided to the light emitting element, the feedback voltage being provided to the feedback line via the feedback transistor; and a reference circuit providing reference signals to the on-pixel feedback conductive path for improving the light output characteristics and compensating for different factors that can cause instability or non-uniformity. - 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 pixel circuit for use in a display, the display comprising a plurality of pixels each pixel connected to a select line, a signal line, and a feedback line, each of the pixels comprising:
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a light emitting element; a drive part for providing a drive current to the light emitting element, the drive part including; a storage capacitor; a switch use transistor; a drive use transistor connected to the light emitting element; an on-pixel feedback circuit for generating a feedback voltage representing a drive current provided to the light emitting element; a feedback transistor having a gate connected to the select line, a first terminal connected to the drive use transistor and a second terminal connected to the feedback line; and a reference circuit providing reference signals to the on-pixel feedback conductive path for improving the light output characteristics and compensating for different factors that can cause instability or non-uniformity. - View Dependent Claims (19, 20, 21, 22)
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23. A method of compensating for pixel instability or non-uniformity in a display having an array of pixel circuits, the method comprising:
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providing to a pixel circuit a signal voltage from a control unit external to the pixel circuit to cause a light emitting device of the pixel circuit to turn on; generating, by an on-pixel feedback circuit that is part of the pixel circuit, a feedback voltage that is representative of a drive current provided to the light emitting device; providing reference signals on a conductive path from the on-pixel feedback circuit for improving light output characteristics of the pixel circuit and compensating for different factors that can cause instability or non-uniformity based at least in part on the feedback voltage; and driving the light emitting device according to a drive current based on the signal voltage and the feedback voltage.
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Specification