An AxoScan with the VRTF fixture is an ideal system for testing LCOS panels and other types of reflective displays. Since the fixture can be configured for transmission or reflection, with varying tilt and rotation angles, nearly all the polarization-critical components used in LCOS projectors and near-eye displays can be characterized.

AxoScan MMSP-VRTF-1-MSRS

Using our LCD view software, the cell gap, alignment direction, twist, and pre tilt angles of the liquid crystals within the LCOS can be measured. Note that measuring vertically aligned (VA) panels requires applying a voltage to the entire panel for cell gap testing.

Vacuum chuck for holding LCOS panels and applying voltage

For devices that need to be measured in retroreflection, it is possible to insert hey beam splitter into the measurement path as shown below.

Use of a calibrated beamsplitter allows retro-reflection measurements

By carefully measuring the Mueller matrix of the beamsplitter in both transmission and reflection, our software can mathematically remove the influence of the beamsplitter from the measurement leaving only the polarization properties of the sample behind.