Device and method for controlling screen brightness

#This application is a 371 U.S. National Stage of International Application No. PCT/CN2010/075311, filed 20 Jul., 2010, and claims priority to Chinese patent application No. 200910176074.X, filed Sep. 28, 2009, the disclosures of which are herein incorporated by reference in their entirety.

#The present invention relates to the field of display control, and more especially, to a method and device for controlling screen brightness.

#In order to avoid problems that a screen of a mobile phone can be seen clearly under strong light such as sun due to dimness of the screen and backlight of the screen of the mobile phone is too bright and too dazzling in dusky environments, a light sensor is added to the mobile phone to automatically change brightness of the backlight of the screen.

#FIG. 1 is a flow chart of a method for controlling screen brightness in accordance with an embodiment of the present invention;

#FIG. 2 is a schematic graph of brightness control using a method for controlling screen brightness in accordance with an embodiment of the present invention; and

#FIG. 3 is a block diagram of a device for controlling screen brightness in accordance with an embodiment the present invention.

#The embodiment of the present invention provides a method for controlling screen brightness comprising: a light sensor acquiring a brightness signal intensity value of external environment and transmitting the brightness signal intensity value to a comparator; the comparator comparing the received brightness signal intensity value with a stored brightness signal intensity value and outputting a comparison result to an integrator; if the comparison result is that the received brightness signal intensity value is greater than the stored brightness signal intensity value, the integrator increasing the stored brightness signal intensity value by a fixed value according to the comparison result; and if the comparison result is that the received brightness signal intensity value is less than the stored brightness signal intensity value, the integrator decreasing the stored brightness signal intensity value by a fixed value according to the comparison result; wherein the stored brightness signal intensity value is used to control an electric current amplitude of the current screen brightness.

#The specific embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings.

#As shown in FIG. 1, a method for controlling screen brightness in accordance with an embodiment of the present invention specifically comprises the following step.