초록 ▼

A two-dimensional array of light emitting diodes (LEDs), controlled by a flame simulation program running on a microprocessor, is used to simulate a relatively large flame, such as one might find in a garden torch. The cost and complexity of controlling the relatively large number of LEDs needed to

A two-dimensional array of light emitting diodes (LEDs), controlled by a flame simulation program running on a microprocessor, is used to simulate a relatively large flame, such as one might find in a garden torch. The cost and complexity of controlling the relatively large number of LEDs needed to simulate a large flame is reduced by arranging the individual LEDs into a two-dimensional array having the anodes of all the LEDs in one column (or row) connected in common to exactly one column buss, and the cathodes of all the LEDs in one row (or column) connected in common to exactly one row buss. The microprocessor acts to connect the vertically-oriented columns of the matrix to a source of electric power one at a time, and to then drive all of the rows by providing a multi-bit digitally encoded output to one or more digital-to-analog converters (D/A), each of which converts the encoded output to an analog voltage and that applies that voltage to a resistor ladder network connected to each horizontal row of LEDs in the matrix. The amplitude of the driving signal applied to any selected LED in a selected column of the matrix thus depends on both the voltage amplitude output by the D/A and the total value of electrical resistance due to the ladder network interposed between the D/A and the LED's row.

대표청구항 ▼

A two-dimensional array of light emitting diodes (LEDs), controlled by a flame simulation program running on a microprocessor, is used to simulate a relatively large flame, such as one might find in a garden torch. The cost and complexity of controlling the relatively large number of LEDs needed to

A two-dimensional array of light emitting diodes (LEDs), controlled by a flame simulation program running on a microprocessor, is used to simulate a relatively large flame, such as one might find in a garden torch. The cost and complexity of controlling the relatively large number of LEDs needed to simulate a large flame is reduced by arranging the individual LEDs into a two-dimensional array having the anodes of all the LEDs in one column (or row) connected in common to exactly one column buss, and the cathodes of all the LEDs in one row (or column) connected in common to exactly one row buss. The microprocessor acts to connect the vertically-oriented columns of the matrix to a source of electric power one at a time, and to then drive all of the rows by providing a multi-bit digitally encoded output to one or more digital-to-analog converters (D/A), each of which converts the encoded output to an analog voltage and that applies that voltage to a resistor ladder network connected to each horizontal row of LEDs in the matrix. The amplitude of the driving signal applied to any selected LED in a selected column of the matrix thus depends on both the voltage amplitude output by the D/A and the total value of electrical resistance due to the ladder network interposed between the D/A and the LED's row. cludes outer edges comprising the exercise of at least one nozzle of the print head associated with specific distinctive colors and an interior portion between the outer edges comprising the exercise of at least one nozzle of the print head associated with colors less distinctive than the color of the outer edges. 5. A segment as in claim 1 wherein the image first edge is a leading edge and the first registration fiducial mark is disposed on the print medium between the print medium leading edge and the image first edge. 6. A segment as in claim 5 wherein the image second edge is a lateral side edge and the second registration fiducial mark is disposed between a lateral side edge of the print medium and the image second edge. 7. A segment as in claim 6 comprising a third fiducial registration mark generated by the print head and extending laterally along the segment opposite and parallel to the second fiducial mark, the three fiducial marks together defining a print field. 8. A segment as in claim 7 including a plurality of photographic images generated by the print head in the print field, the images arranged in at least one transverse row wherein the images in the at least one transverse row have aligned leading edges and the first registration fiducial mark provides a reference for locating the first edge of each image with respect to the print medium leading edge. 9. A segment of print medium having transverse leading and trailing edges and opposite side edges, the segment having a printable surface for receiving an inkjet output of a print head, the segment further comprising: a) a printed field comprising one or more photographic images generated by the print head; b) a transverse fiducial registration mark generated by the print head defining a leading edge of the printed field and providing reference information for the location of a first transverse cut through the printed field; and c) a lateral fiducial registration mark generated by the print head orthogonal to the first fiducial mark defining a lateral edge of the printed field and providing reference information for the location of a lateral cut through the printed field. 10. A segment as in claim 9 including a pair of the lateral fiducial registration marks defining opposite lateral edges of the print field.