Patent ID: 8766919

Claim:
A method comprising: receiving a keypad wakeup interrupt at an electronic device; awakening the electronic device from a low power mode at least partly in response to the receiving of the keypad wakeup interrupt; when a pre-rendered image cache of the electronic device does not store a pre-rendered image: starting a rendering application; synchronizing a presented image on a display with content to be presented; pre-rendering an image of the content to be presented; storing the pre-rendered image in the pre-rendered image cache; placing the electronic device into the low power mode; when the pre-rendered image cache of the electronic device does store a pre-rendered image: presenting the stored pre-rendered image on the display; when the pre-rendered image cache is empty after presentation of the stored pre-rendered image: starting the rendering application; synchronizing the presented image on the display with content to be presented; pre-rendering an image of the content to be presented; storing the pre-rendered image in the pre-rendered image cache; placing the electronic device into the low power mode; and when the pre-rendered image cache is not empty after presentation of the stored pre-rendered image: placing the electronic device into the low power mode.