dual view display
Dual-view displays allow two different programs to be shown on one screen and viewed separately from different angles. Such displays are already installed in notebooks to prevent other viewers from seeing the displayed image, but they are also used in motor vehicles and provide the driver with the navigation display, for example, while the passenger can watch the video from a DVD on the same screen.
The dual-view display works with a parallax barrier that is placed in front of a TFT display and which successively allows the view from the left and right onto the display. The parallax barrier is an upstream liquid crystal layer that can be switched to be translucent or non-translucent as required, thus electronically controlling the viewing angles of the two images.
The different displays on the screen, for example the navigation information for the driver and the DVD video for the front passenger, are switched at the same rate as the parallax barrier. If the navigation display appears on the screen, only the driver can see this display because the parallax barrier has simultaneously released the display towards the driver. At the next beat, the DVD video is displayed on the screen and the parallax barrier enables the display to the passenger.
In addition to the dual-view display used in cars, this display technology is also of interest for confidential displays on laptops and ATMs. However, the technology is modified so that one image is seen from the frontal viewing angle and the other from an oblique viewing angle. This prevents curious viewers from seeing confidential displays.