Active Matrix Display Drive Control Systems
First Claim
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1. A method of reducing the power consumption of an active matrix electroluminescent display, the method comprising:
- controlling a power supply voltage to the display; and
monitoring a power supply current to the display; and
whereinsaid controlling further comprises progressively reducing said power supply voltage until said power supply current reduces by greater than a threshold.
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Abstract
This invention relates to methods, apparatus, and computer program code for driving an active matrix display, in particular an organic light emitting diode (OLED) display, with reduced power consumption.
212 Citations
23 Claims
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1. A method of reducing the power consumption of an active matrix electroluminescent display, the method comprising:
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controlling a power supply voltage to the display; and monitoring a power supply current to the display; and
whereinsaid controlling further comprises progressively reducing said power supply voltage until said power supply current reduces by greater than a threshold. - View Dependent Claims (2, 3, 4, 5, 6, 17, 21)
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- 7. An active matrix display driver including the carrier of claim 7.
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8. An active matrix display driver for driving an active matrix electroluminescent display, the driver comprising:
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a controller for controlling a power supply voltage to the display; a monitor for monitoring a power supply current to the display; and wherein said controller progressively reduces said power supply voltage until said power supply current reduces by greater than a threshold.
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9. A controller for an active matrix electroluminescent display driver, the display having a plurality of pixels each with an electroluminescent display element and an associated drive transistor, the display having a power supply line for providing power to the driver transistors of said pixels;
- the driver comprising a pixel data driver to drive said display pixels with data for display, a controllable voltage power supply to provide a power supply to said power supply line, and a current sensor to sense a current in said power supply line;
the controller comprising;a current sense input for said current sensor; a voltage control output for said controllable power supply; and a voltage controller to provide a voltage control signal for said voltage control output responsive to a current sense signal from said current sense input. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16, 22)
- the driver comprising a pixel data driver to drive said display pixels with data for display, a controllable voltage power supply to provide a power supply to said power supply line, and a current sensor to sense a current in said power supply line;
- 18. An active matrix OLED display comprising a plurality of pixels each with an OLED display element and an associated driver transistor, and wherein said display comprises at least two portions with separate power supply lines for providing power to said driver transistor.
Specification