Adjusting frontlight brightness during page updates

摘要

Techniques for adjusting a brightness of a front that lights a display of an electronic device in response to determining that the display is going to perform an update. Typically, page updates on certain types of displays, such as electronic paper displays, result in a relatively large but rapid change in brightness. Therefore, by increasing the brightness during the relatively dark portion of the update (e.g., when some, a majority, or all of the pixels are in the black state) and then decreasing the brightness back to its initial state upon completion of the update, the overall brightness perceived by the user remains more uniform. Increasing the uniformity of this perceived brightness in turn decreases the jarring affect of the flashing update and increases the experience of the user.

主权项

1. A method comprising:
under control of a device that includes an electronic paper display, a display controller to control updating of the electronic paper display, a frontlight to light the electronic paper display, and a frontlight controller to control the frontlight,
displaying, on the electronic paper display, a first page of an electronic book while the frontlight lights the electronic paper display at a first brightness value;receiving a first request, the first request comprising a request to display a second, subsequent page on the electronic paper display;updating, by the display controller and at least partly in response to the receiving of the first request, the electronic paper display to display the second page of the electronic book;receiving, at least partly in response to the receiving of the first request, a second request, the second request comprising a request to increase a brightness of the frontlight from first brightness value to a second brightness value during the updating and to decrease the brightness from the second brightness value to the first brightness value upon completion of the updating, wherein the second brightness value is greater than the first brightness value;approximately contemporaneously with commencement of the updating, increasing, by the frontlight controller, the brightness of the frontlight to the second brightness value; anddecreasing, by the frontlight controller, the brightness of the frontlight to the first brightness value approximately contemporaneously with completion of the updating.