Increasingly wider viewing angles in LCDs have made possible clear, highly readable displays without loss of image quality regardless of which direction the display is viewed from, and therefore several users can view an LCD simultaneously. This has drastically boosted demand for LCD application products such as LCD TVs and monitors, notebook PCs, in-vehicle rear-seat entertainment, and mobile phones. Meanwhile, as the settings in which such devices are used continue to expand, and the information and visual content displayed on them continue to expand, a rapidly increasing need exists among a broad range of users for a single device capable of restricting the display to only the information or content users need to see.
Using a number of proprietary technologies, such as a parallax barrier superimposed on an ordinary TFT LCD, the LCD sends the light from the backlight into right and left directions, making it possible to show different information and visual content on the same screen at the same time depending on the viewing angle. Controlling the viewing angle in this way allows the information or visual content to be tailored to multiple users viewing the same screen. For instance, in an in-car application, the driver's side could display a map while the passenger's side shows a DVD movie. As another example, one user can view the display as a PC screen for browsing the Internet or for editing images shot using a digital camera while at the same time another user watches video content such as a movie or a TV broadcast. This ability to enjoy two functions in a single unit in full-screen size will contribute to achieving a full-fledged convergence of digital home electronics A/V and IT.
Two-way viewing-angle LCD (Controlled viewing-angle LCD) Features:
- Enables simultaneous display of different information and visual content depending on whether viewed from the right or left direction. A clear, readable display is possible with no intermingling of the respective display content.
-The LCD can function normally by displaying the same content on the (A) and (B) screen views.
Theory of operation:
Superimposing a parallax barrier on a TFT LCD to cause the light from the backlight to separate into right and left directions makes possible a display in which the view differs depending on the angle at which the screen is viewed.
Envisioned application scenarios:
- "LCD multimedia monitor" -- Display a TV broadcast on the right screen, while displaying an Internet browser
- "Professional monitor" -- Display sales offer information to clients on one side while revealing internal data to sales personnel on the other.
- "Advertisement monitor" -- A passerby who comes from right direction can see advertisement (A), and a passerby who comes from left direction can see advertisement (B). The LCD enables the simultaneous display of two different advertisements and makes more effective use of LCD placements.