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Enhanced automatic brightness adjustment for mobile devices

IP.com Disclosure Number: IPCOM000209407D
Publication Date: 2011-Aug-03
Document File: 2 page(s) / 49K

Publishing Venue

The IP.com Prior Art Database

Abstract

A method is disclosed that modifies the way in which automatic brightness adjustment works to allow a device to include this feature whilst maintaining a user's preference within a scale range.

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Enhanced automatic brightness adjustment for mobile devices

The desired level of display brightness on devices such as mobile phones or laptops is affected by required power-saving profiles and by environmental conditions e.g. in bright sunlight, it is necessary to increase the brightness of the screen to make viewing possible, and if a device is running low on power the user will want to minimise the brightness to prolong battery life.

    Existing algorithms describe scenarios in which a discreet scale can have the range of allowable positions and its values moved and resized for scales such as volume. Applying these algorithms to the example of a mobile phone's screen brightness, in very bright surroundings we would wish to have the upper bound of our available brightness range right at the top of the device's capabilities, whilst the lower bound would be raised up (as many of the available lower brightness levels would not be usable in such lighting conditions). Similarly, in low-light conditions, we could shift the upper bound down, as those high brightness settings are not necessary in such an environment. However, such algorithms do not take into account the users current selection within the available range prior to the scale being adjusted. When the scale changes and the user's current selection is not within the new range, current implementations will simply move the user's selection to the lower/upper bound.

    The method disclosed proposes an enhancement on top of these algorithms to address the issues of automatic brightness adjustment and user-controlled power-saving. The user selects their brightness level within the initial available range. When the method disclosed is enabled, the system would calculate where on the scale the user's selected brightness sits (e.g. value 2 out of 10 possible values). The ambient light is read using a sensor and a new acceptable range is calculated by the existing algorithm. The brightness of the device will then be set according to this formula:

BRIGHTNESS = MIN_VALUE + (BRIGHTNESS_MODIFIER - 1) * ( (MAX_VALUE - MIN_VALUE) / (NUMBER_OF_VALUES - 1) )

    BRIGHTNESS_MODIFIER will be between 1 and the NUMBER_OF_VALUES on the scale, i.e. the position on the scale. On a scale of 1 to 10 where only integer values are selectable, the brightness modifier directly corresponds to the brightness setting. On other scales, a modifier of 2 would mean "pick the second value on this sc...