Adjusting front light brightness during display updates

摘要

Techniques are presented for adjusting a brightness of a front light that illuminates a display of an electronic device. 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 adjusting the brightness of the front light during the update (e.g., when some, a majority, or all of the pixels are in the white state) and then adjusting the brightness back to another state upon or near 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 effect of an update and increases the experience of the user.

主权项

1. A method comprising:
illuminating an electronic paper display using a front light; displaying, on the electronic paper display, a first page of an electronic book according to a night mode, wherein in the night mode text of the electronic book is white and a background is black; receiving a request to display a second page on the electronic paper display according to the night mode; decreasing, based at least in part on receiving the request, a brightness of the front light from a first brightness value to a second brightness value, the second brightness value at or near a zero value; updating the electronic paper display to display the second page of the electronic book, the updating changing first pixel values associated with the first page to second pixel values associated with the second page; and increasing the brightness of the front light from the second brightness value to the first brightness value approximately contemporaneously with completion of the updating.