| 摘要 |
A device and method for controlling screen brightness are provided, the method includes: an optical sensor obtains a brightness signal intensity value of external environment and passes the value to a comparer; the comparer compares the received brightness signal intensity value with a brightness signal intensity value it saved, and outputs a comparing result to an integrator; if the comparing result is that the received brightness signal intensity value is higher than the saved brightness signal intensity value, the integrator then increases the saved brightness signal intensity value by a fixed value according to the comparing result; and if the comparing result is that the received brightness signal intensity value is lower than the saved brightness signal intensity value, the integrator then decreases the saved brightness signal intensity value by a fixed value according to the comparing result; wherein, the saved brightness signal intensity value is used for controlling the current amplitude of current screen brightness. This technical solution can provide relatively stable screen brightness in the event that the brightness around an LCD screen is not stable and thereby reduce current consumption. |
