Self-alignment-Vertical-alignment LCD technology

Improved processing and green technology


Easier production

PS-VA LCDs require a polyimide (PI) as an orientation?layer to vertically align LC materials on the substrate. In the case of SA-VA LCDs, specific additives in the LC mixture ensure the vertical?orientation. Consequently, the LC mixture takes over an additional function. A?PI orientation layer is not needed.

All other following steps such as tilt?angle adjustment with RMs are comparable to PS-VA.

The production of?LCDs with SA-VA technology is becoming easier.

Explore SA-VA with the LCD-Explorer.

Benefits

  • Green technology because no orientation layer is necessary, thus saving energy and reducing waste (orientation layer process)
  • No interaction of PI material with LC material is possible. Potentially improves
    LCD reliability.
  • Compatible with existing PS-VA production lines.
  • Extremely narrow bezel LCDs are possible (no critical interaction of sealant
    with PI layer).
  • Enables low temperature processes (compatible with heat-sensitive materials, e.g. plastic substrates, organic TFTs) by removing high temperature PI step.
SA-VA switching mode
SA-VA switching mode

In the “on” state, the major part of LC molecules are aligned parallel to the surface. A small part is still aligned orthogonally to the surface due to strong interaction with RM/SA additive layer.

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