Display driver circuits for organic light emitting diode displays with skipping of blank lines, method of reducing power consumption of a display, processor control code to implement the method, and carrier for the control code
First Claim
1. Display driver control circuitry for a passive matrix emissive display, the display comprising a plurality of pixels arranged in rows and columns and addressed by row and column electrodes, the control circuitry being configured to address each row in turn to give the appearance of an image on the display, the control circuitry further comprising:
- a frame memory interface for reading data from a frame memory for presentation on the display;
a blank line identifier for identifying one or more substantially blank rows of pixels defined by said data;
wherein the control circuitry is further configured to skip past said one or more blank rows of pixels during said row addressing;
column driver circuitry comprising at least one column drive output to provide a column drive and a data input to control said column drive based on said frame memory data; and
an input configured to receive a reference drive output for scaling the controlled column drive,the control circuitry further comprising said reference drive output, and wherein the reference drive output is configured to vary depending on the number of identified blank rows and to reduce the column drive depending upon the number of identified blank rows of pixels such that a perceived pixel brightness of a plurality of rows remains constant as the number of identified blank rows of pixels varies.
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Abstract
Display driver circuits are described for driving organic light emitting diode displays, particularly passive matrix displays with greater efficiency. Display driver control circuitry (506) comprises a frame memory interface (505) for reading data from a frame memory (504) for presentation on a passive matrix OLED display. A blank line identifier (507) identifies one or more substantially blank rows of pixels defined by the data in the frame memory and the control circuitry (506) skips past these rows when the passive matrix display is addressed. When blank lines are skipped the apparent brightness of the remaining lines increases and thus preferably the control circuitry includes a power controller (505) for reducing a power supply to the display in proportion to the number of skipped lines. The invention is particularly suited to a display driver providing a controlled current drive.
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Citations
14 Claims
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1. Display driver control circuitry for a passive matrix emissive display, the display comprising a plurality of pixels arranged in rows and columns and addressed by row and column electrodes, the control circuitry being configured to address each row in turn to give the appearance of an image on the display, the control circuitry further comprising:
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a frame memory interface for reading data from a frame memory for presentation on the display; a blank line identifier for identifying one or more substantially blank rows of pixels defined by said data; wherein the control circuitry is further configured to skip past said one or more blank rows of pixels during said row addressing; column driver circuitry comprising at least one column drive output to provide a column drive and a data input to control said column drive based on said frame memory data; and an input configured to receive a reference drive output for scaling the controlled column drive, the control circuitry further comprising said reference drive output, and wherein the reference drive output is configured to vary depending on the number of identified blank rows and to reduce the column drive depending upon the number of identified blank rows of pixels such that a perceived pixel brightness of a plurality of rows remains constant as the number of identified blank rows of pixels varies. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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Specification