Abstract: A method and apparatus for driving light emitting polymer (PolyLED) displays is provided. Because PolyLED displays exhibit high capacitance characteristics, pre-charge current is injected to bring the diode up to near its operating current prior to enabling the diode. Thus, time and power is not wasted charging and discharging the high capacitance that is inherent in PolyLED displays and life of the diodes are prolonged because the diodes are not required to swing the full voltage range during each cycle. In addition, since older diodes need more voltage to produce the same current thus the same light intensity as newer diodes, an embodiment of the present invention adds an adaptive power generation system that actively monitors and adjusts power as necessary in order to generate constant amount of light (i.e., constant current) from all the diodes in the display.

Abstract: A method and apparatus for driving light emitting polymer (PolyLED) displays is provided. Because PolyLED displays exhibit high capacitance characteristics, pre-charge current is injected to bring the diode up to near its operating current prior to enabling the diode. Thus, time and power is not wasted charging and discharging the high capacitance that is inherent in PolyLED displays and life of the diodes are prolonged because the diodes are not required to swing the full voltage range during each cycle. In addition, since older diodes need more voltage to produce the same current thus the same light intensity as newer diodes, an embodiment of the present invention adds an adaptive power generation system that actively monitors and adjusts power as necessary in order to generate constant amount of light (i.e., constant current) from all the diodes in the display.

Abstract: An optimized refresh strategy for increasing bandwidth of an LCD. The present invention results in an LCD suitable for dynamic display of information. In the present invention, a display memory is used to store display data generated by a CPU and to provide that data to an LCD. All data writes to the display memory by the CPU are tracked and rows or columns that contain modified data are tagged. These tags may be "set" by mapping the display memory write addresses to row or column numbers. The tags are examined and mapped back into the display memory addresses and only those rows or columns containing changed data are transferred to the data stream for display. As a result, only the information that is changed in the display memory is sent to the display and the dynamic bandwidth of the display is maximized. The refresh in the present invention can be either row-based or column-based.