Rigid-Flex PCB Design for an Innovative Helmet-Mounted Display
To create a prototype binocular holographic waveguide visor display, an Air Force pilot, a cutting-edge high-speed design and HDI boards were used to significantly decrease cost, volume and weight of the traditional helmet-mounted displays.
by Dr. Dave Cowl
Advanced Acoustic Methods for Flip Chips
The miniscule size of structural defects in flip chips makes thorough inspection vital. But while most structural defects lie beneath the die, and acoustic micro imaging tools can be used to nondestructively find and analyze them, the architecture of some solder bumps makes defects difficult to discern with standard AMI techniques. Here the authors discuss two AMI techniques that can reveal defects that might otherwise escape notice.
by Tom Adams
The software-hardware showdown.