Apple Inc. has a new patent running around explaining a new technology that will allow the iPhone to have "Always-On" display with almost no battery cost. Here's a brief explanation from Apple about how this useful technology would work:
The primary backlight system may block light from the secondary backlight system except for those one or more regions. Thus, the size and shape of the status indicator may be set by sizing and shaping the transparent or semitransparent regions of the primary backlight system. In addition to setting the size and shape of the icon, the color of the icon may also be set by adjusting the color of the light provided by the secondary backlight system.
For example, each indicator may have a particular color, blinking speed, or light intensity. These properties may be programmed into the electronic device by the user, or may be hard-coded or hard-wired into the system. Thus, when the secondary backlight is turned on, the properties of the light provided by the secondary backlight system may depend on the status of the device. Also, if the status of the electronic device changes while the secondary backlight is on, the properties of the light provided by the secondary backlight system may change to reflect the new status.
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