Microelectronics industry produces OLED or LCD microdisplays on silicon wafer with a very competitive cost. LCD micro displays are primarily optical index material matrices electrically tunable and are sometimes used for wave front correction; we call them SLM (spatial light modulator). These active matrices are opaque and more difficult to integrate in an optical device. However, CEA LETI is expert to transfer onto any substrate, especially on glass, a few microns thick of a circuit built on silicon. CEA LETI has already made a similar device but requiring post transfer process steps glass substrate for a liquid crystal display operating in MTN mode (“mixed twist nematic”). It is now to transfer glass by a double transfer order to remove post transfer processes and to adapt the pixel design to operate in IPS mode ( “in plane switching “) in order to integrate all the electrodes and electrodes while silicon processing . We’ll look at first to describe the means to modulate the light phase of with variable index material ( liquid crystal) with or without polarization modification and then evaluate the different possibilities , by means of specific software ( DIMOS 3D) , of liquid crystal modulation depending on the pixel design and various liquid crystal alignment modes, homogeneous , isotropic, twisted not with IPS driving mode. This work will define a test passive matrix that will be performed on 200mm silicon wafer and transferred onto glass in CEA LETI cleanrooms. This matrix will achieve the test vehicle by controlling the liquid crystal assembly techniques. Characterization requests the establishment of dedicated optical and electronic benches.

This position is open until it is filled.

Département: Département d’Optronique (LETI)
Laboratory: Laboratoire des Composants pour la Visualisation (LCV)
Start Date: 01-05-2015
ECA Code: SL-DRT-15-0452
Contact: umberto.rossini<στο>cea.fr