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Improvement Technology of LCD Display
6-6 Optically Compensated Film
By using the optically compensated film, the phase shift of the STN type of LCD display is corrected, and
the angle of view and contrast are improved.
(Refer to 4-3 Triple STN Type.)
Three methods for attaching the optically compensated film are shown in Fig. 26.
1 sheet / 1 side
Polarized Board
Compensated
Film
Liquid Crystal
Polarized
Board
6-7 OCB (Optically Compensated Birefringence) System
The OCB system combines the bend-alignment system where the liquid crystal molecules are bent and
aligned between the upper and lower boards and optically compensation film. This system has the fea-
tures of increased angle of view and quicker response speeds. However, bend-alignment is difficult to
make uniform and stable.
Glass
Plate
Glass
Plate
2 sheets / 1 side
Polarized Board
Compensated Film 1
Compensated Film 2
Liquid Crystal
Polarized
Board
Polarized Board
Optically Compensated
Film
Transparent Electrode
(Common)
Alignment Film
Liquid Crystal Molecule
Alignment Film
-26-
Training Manual Principle of LCD
2 sheets / 2 sides
Polarized Board
Liquid Crystal
Polarized
Board
Fig. 26
Optically Compensated Film
Transparent Electrode
(Pixel, TFT)
Polarized
Board
Fig. 27
OCB System
Compensated
Film 1
Compensated
Film 2
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