1. A driver circuit for LEDs, comprising:
a phase lock loop;
a pulse width modulation engine;
a configuration register;
a gain adjustable fast charge current source;
a DOT correction adjustment means for adjusting an output current to an LED; and
a serial inputoutput interface,
wherein the phase lock loop, operatively connected to the serial inputoutput interface, provides a global clock signal,
wherein the pulse width modulation engine, operatively connected to the serial inputoutput interface, receives gray scale values from the serial inputoutput interface and the global clock signal from the phase lock loop, and generates a PWM signal for the gain adjustable fast charge current source,
wherein the configuration register, operatively connected to the serial inputoutput interface and the gain adjustable fast charge current source, stores driver circuit settings,
wherein the gain adjustable fast charge current source, operatively connected to the configuration register, the serial inputoutput interface, and the pulse width modulation engine, provides a current output to drive an LED array, and
wherein the serial inputoutput interface, operatively connected to the phase locked loop, the configuration register, the pulse width modulation engine, and the gain adjustable fast charge current sources, provides driver circuit settings to the configuration register, provides gray scale values to the pulse width modulation engine, and provides global gain adjustment settings to the gain adjustable fast charge current source.
2. The driver circuit according to claim 1, further comprising a sink current return circuit for receiving a current from the LED array.
3. The driver circuit according to claim 1, further comprising an error detection circuit, wherein the error detection circuit monitors a voltage drop across a LED.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
1-6. (canceled)
7. A spinneret plate for producing a bulked continuous filament comprising a cluster of three generally U-shaped orifices grouped around a central point, each orifice having an open end and a generally rounded closed end, wherein the closed end points away from the central point.
8. The spinneret plate of claim 7, wherein the filament produced by extruding a synthetic polymer through the orifices of the spinneret comprises a three-sided exterior configuration and a trilobal cross-sectional geometry comprising three lobes defined by three rounded tips and a generally round void extending centrally and axially therethrough, and wherein the filament has an exterior modification ratio of about 1.35 to 1.85 and a tip ratio of about 2 to 5.
9. A spinneret plate for producing a bulked continuous filament comprising:
a cluster of three generally U-shaped orifices grouped around a central point, wherein each orifice having an open end and a generally rounded closed end, wherein the closed end points away from the central point,
each orifice having an outer edge and an inner edge,
the outer edge defined by first and second outer parallel lines extending from the open end of the \u201cU\u201d towards the closed end and joined at the closed end by a curved portion which defines the generally rounded closed end of the \u201cU\u201d, and
the inner edge forming the open end of the \u201cU\u201d and defined by first and second inner parallel lines extending from the open end of the \u201cU\u201d substantially parallel to the first and second outer parallel lines and joined by a third inner line being substantially perpendicular to the first and second inner parallel lines.
10. The spinneret plate of claim 8, wherein the first outer parallel line and first inner parallel line are joined by a first top line, and the second outer parallel line and second inner parallel line are joined by a second top line.
11. The spinneret plate of claim 9, wherein the first and second top lines are not perpendicular to either of the first and second outer parallel lines or the first and second inner parallel lines.
12. The spinneret plate of claim 9, wherein the angle formed between the outer parallel line and the top line is greater than about 90 degrees.
13. The spinneret plate of claim 9, wherein the angle formed between the inner parallel line and the top line is less than about 90 degrees.
14. The spinneret plate of claim 8, wherein the distance from the central point to an outer-most point of the curved portion of the rounded, closed end is about 0.020 to 0.200 centimeter.
15. The spinneret plate of claim 8, wherein the distance between the first outer parallel line and the second outer parallel line is about 0.0100 to 0.1000 centimeters.
16. The spinneret plate of claim 8, wherein the distance between the first inner parallel line and the second inner parallel line is about 0.0050 to 0.0500 centimeters.
17. The spinneret plate of claim 8, wherein the distance from the central point to the third inner line is about 0.0080 to 0.800 centimeter.
18. The spinneret plate of claim 8, wherein the distance between the first top line of one orifice and the second top line of an adjacent orifice is about 0.0030 to 0.0300 centimeter.
19. A method of forming a bulked continuous filament having a trilobal cross section and a single, generally round void extending axially through the filament, comprising:
extruding a synthetic polymer through the spinneret plate of claim 1 to produce the filament.
20. A method of forming a bulked continuous filament having a trilobal cross section and a single, generally round void extending axially through the filament, comprising:
extruding a synthetic polymer through the spinneret plate of claim 2 to produce the filament.