Flat panel circuit traces thin film trimming

* TitlerDisplay industry

FPDs are usually manufactured in big panels with a number of subpanels. Panel IDs in the form of text and 2D matrix or Veri-code are needed to be marked on pads as small as 0.8mm in height in each subpanel. The ScanVsion™ achieves an accuracy of +/- 15um for high speed marking by using galvanometers moving mirrors.  The sequence is find fiducial, mark and verification of mark in each marking location.

* TrimmingTracecutting

Test circuits are built into the LCD panels for the final test and after testing, the tracks of the test circuit have to be trimmed off. The accuracy requirement can be as high as +/- 10um.
ScanVision™ achieves high precision and speed by using the galvanometers movement to perform fiducial find, drift compensation, laser trim process and post trim check almost simultaneously whereby increasing the   throughput by 3 fold over conventional systems.


Transparent  ITO thin film on glass removal

Cutting line width

Cutting lines to isolate regions in thin film ITO deposited on glass panel

Comparison of cutting with green and IR lasers on transparent ITO deposited on glass

The laser is able to provide good and clean isolation cuts on ITO as tested with electrical continuity probe test

 Chip resistor laser trimming

Chip resistor trimming using lasers is a well proven and prevalent method used in the industry. This is especially so for passive trimming. Active trimming is useful too for final product characterisation and calibration of operation to global standards. However as products move rapidly in miniaturisation, there is need to squeeze the chip resistor size smaller and smaller with sizes like 03015. In this situation and to get higher resistance there is need to pack more trim lines in higher density thus approaching limits of laser spot size and trimming line width.

Hylax superior technology and expertise has enabled it to achieve trimming line width of 6 microns with pitch of 12 microns between lines. This is made possible with a combination of special optics, laser, electronics, scanhead and software innovation. With this achievement chip resistors can be used in even denser circuit boards and help produce smaller and smaller gadgets demanded by consumers nowadays.

Resistor trimming ultra narrow width using UV laser
Resistor trimming ultra narrow width using UV laser

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