Digital image picture frame with self-adaptive control of brightness level
First Claim
1. A method for automatically controlling the on/off switching of a display screen of a picture frame for digital photographic images, wherein the picture frame comprises:
- a display screen suitable for displaying an image in the form of a matrix of pixels;
a driver circuit for driving said display screen;
processor means suitable for delivering image data to the driver circuit for display on said display screen;
memory means for storing image data blocks and co-operating with said processor means;
means for lighting said display screen; and
means for automatically controlling the brightness level of said screen, including a sensor for sensing an ambient lighting level;
wherein said method comprises;
a) determining at regular intervals successive mean values of said ambient lighting level;
b) determining a mean minimum value and a mean maximal value from said successive mean values over a pre-determined time period;
c) deriving from said mean minimum value and said mean maximal value a darkness-to-light transition threshold and a light-to-darkness transition threshold;
d) comparing the current ambient lighting level to said darkness-to-light and light-to-darkness transition thresholds;
e) switching on said display screen upon crossing of said darkness-to-light transition threshold and switching off said display screen upon crossing of said light-to-darkness transition threshold.
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Accused Products
Abstract
The picture frame comprises: a decorative frame (18), support or hanging means (22, 24), a display screen (12), a driver circuit (46, 48) for driving the screen, and a processor (32). It further includes wireless interface means (34), in particular of the Bluetooth type, for interfacing with a remote appliance such as a mobile telephone in order to receive therefrom digital image data blocks, each corresponding to an image for storing in a memory (40) and for displaying on the display screen. In the event of a change in the state of a change of a screen orientation sensor (50), the processor applies pivot processing to the image data so as to restore the initial orientation of the displayed image. The picture frame also includes self-adaptive means for controlling its brightness level and suitable for detecting and storing successive changes of state in a sensor and for extrapolating from said changes an automatic control relationship for controlling the brightness level of the screen.
10 Citations
13 Claims
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1. A method for automatically controlling the on/off switching of a display screen of a picture frame for digital photographic images, wherein the picture frame comprises:
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a display screen suitable for displaying an image in the form of a matrix of pixels; a driver circuit for driving said display screen; processor means suitable for delivering image data to the driver circuit for display on said display screen; memory means for storing image data blocks and co-operating with said processor means; means for lighting said display screen; and means for automatically controlling the brightness level of said screen, including a sensor for sensing an ambient lighting level; wherein said method comprises; a) determining at regular intervals successive mean values of said ambient lighting level; b) determining a mean minimum value and a mean maximal value from said successive mean values over a pre-determined time period; c) deriving from said mean minimum value and said mean maximal value a darkness-to-light transition threshold and a light-to-darkness transition threshold; d) comparing the current ambient lighting level to said darkness-to-light and light-to-darkness transition thresholds; e) switching on said display screen upon crossing of said darkness-to-light transition threshold and switching off said display screen upon crossing of said light-to-darkness transition threshold. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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Specification