Systems and methods for providing polarization compensated multi-spectral laser repair of liquid crystal display panels
View Patent ↗A system is disclosed for repairing liquid crystal display panels that include a polarizing film. The system includes a laser repair optical system, a measurement optical system, and a processor. The laser repair optical system includes a polarization unit for modifying a polarization of a laser repair beam along a laser output path that is directed toward a workpiece. The measurement optical system includes an illumination source for providing measurement illumination along a measurement illumination path, and a detector for detecting reflected measurement illumination. The processor adjusts the polarization unit responsive to the reflected measurement illumination.
1. An LCD repair system for repairing liquid crystal display panels that include a polarizing film, said system comprising:
a laser repair optical system that includes a polarization unit for modifying a polarization of a laser repair beam along a laser output path that is directed toward a workpiece;
a measurement optical system that includes an illumination source for providing measurement illumination along a measurement illumination path, and a detector for detecting reflected measurement illumination; and
a processor for determining an adjustment for the polarization unit responsive to the reflected measurement illumination.
2. The LCD repair system as claimed in claim 1 , wherein said system further includes a laser source for providing laser outputs at a plurality of wavelengths.
3. The LCD repair system as claimed in claim 1 , wherein said laser output path and said measurement illumination path are coaxial for at least a portions of said laser output path and said measurement illumination path.
4. The LCD repair system as claimed in claim 1 , wherein said polarization adjustment unit is a rotatable ½ half wave plate.
5. The LCD repair system as claimed in claim 1 , wherein said laser output path includes an X-axis AOBD and a Y-axis AOBD.
6. The LCD repair system as claimed in claim 1 , wherein said processor includes an energy calibration table having energy correction values for different polarizations.
7. The LCD repair system as claimed in claim 1 , wherein said system includes calibration means for determining an optimal polarization of the laser repair beam to provide a desired laser energy at the workpiece.
8. An LCD repair system for repairing liquid crystal display panels that include a polarizing film, said system comprising:
a laser repair optical system that includes a polarization unit for modifying a polarization of a laser repair beam along a laser output path that is directed toward a workpiece;
a processor for determining an optimal polarization of the laser repair beam to provide a desired laser energy at the workpiece;
a measurement optical system that includes an illumination source for providing measurement illumination along a measurement illumination path, and a detector for detecting reflected measurement illumination; and
wherein the processor determines an adjustment for adjusting the polarization unit responsive to the optimal polarization to provide a desired energy at the workpiece, and the reflected measurement illumination.
9. The LCD repair system as claimed in claim 8 , wherein said system further includes a laser source for providing laser outputs at a plurality of wavelengths.
10. The LCD repair system as claimed in claim 8 , wherein said laser output path and said measurement illumination path are coaxial for at least a portions of said laser output path and said measurement illumination path.
11. The LCD repair system as claimed in claim 8 , wherein said polarization adjustment unit is a rotatable ½ half wave plate.
12. The LCD repair system as claimed in claim 8 , wherein said laser output path includes an X-axis AOBD and a Y-axis AOBD.
13. The LCD repair system as claimed in claim 8 , wherein said processor includes an energy calibration table having energy correction values for different polarizations.
14. A method of repairing an LCD display, said method comprising the steps of:
providing a laser repair optical system that includes a polarization unit for modifying a polarization of a laser repair beam along a laser output path that is directed toward a workpiece;
determining an optimal polarization of the laser repair beam to provide a desired laser energy at the workpiece;
providing a measurement optical system that includes an illumination source for providing measurement illumination along a measurement illumination path;
detecting reflected measurement illumination; and
determining an adjustment for adjusting the polarization unit responsive to the optimal polarization to provide a desired energy at the workpiece, and the reflected measurement illumination.
15. The method of repairing an LCD display as claimed in claim 14 , wherein said method further includes the step of providing laser outputs at a plurality of wavelengths.
16. The method of repairing an LCD display as claimed in claim 14 , wherein said laser output path and said measurement illumination path are coaxial for at least a portions of said laser output path and said measurement illumination path.
17. The method of repairing an LCD display as claimed in claim 14 , wherein said polarization adjustment unit is a rotatable ½ half wave plate.
18. The method of repairing an LCD display as claimed in claim 14 , wherein said laser output path includes an X-axis AOBD and a Y-axis AOBD.
19. The method of repairing an LCD display as claimed in claim 14 , wherein said step of determining an adjustment for adjusting the polarization unit responsive to the optimal polarization to provide a desired energy at the workpiece, and the reflected measurement illumination involves accessing an energy calibration table having energy correction values for different polarizations.