Viewing angle changeable display can change the display viewing angle as needed: In the public place the display could
have a narrow viewing angle for privacy, while in the private place the displays could have a wide viewing angle for the
convenience of the operation and better viewing experience.
This article propose a novel adjustable optical transmission device to realize the viewing angle changes for LCD by
using the principle of guest- host effect of liquid crystal. The major technology is to insert a special equipment between
the backlight and the LCD, through which the backlight will display either parallel or scattered features to get an either
narrow or wide viewing angle. The equipment is an adjustable transmission cell (ATC) which is actually a black G-H LC
cell. This ATC is the main focus of our invention. The ATC consists of a polarizer sheet and a special guest-host liquid
crystal device filled with the two-phase dye (called as GH-LC in this report), to achieve the viewing angle change in the
LCD. When an electrical field charges to the ATC, only the so-called near-axis lights can pass through the ATC within a
relatively small angle, while the other scattered lights are absorbed sequentially by GH-LC and the polarizer sheet. On
the other hand, when there is no electrical charge to the ATC, the cell behaves like a normal polarizer; and the scattered
light can pass through the cell and polarizer in a normal way. This paper describes the principle and structure of the
device, applies the electric field on the sample to observe the electro-optical properties, combine the theoretical and
experimental research, getting the viewing angle effects of the display.