>>536
The guest-host ( GH ) display can be driven by TFT arrays. But, its contrast ratio is limited to 〜 5 : 1.
Because the operation principle of a GH display is based on utilization of absorption anisotropy of dichroic dye molecules doped in an aligned LC host.
Normally, a GH display system consists of 1 〜 5 % of absorbing dye molecules dissolved in a LC host.
The host LC is highly transparent in a visible spectral region and the guest dyes strongly absorb one polarization of an incoming light and transmit other polarization.
