摘要
本文分析了环境光传感器工作原理及性能参数。提出一种基于Windows Phone的嵌入式系统设计方案,编写环境光传感器驱动采集外部光照强度,优化检测灵敏度来降低光传感器的功耗,根据采集到的数据控制(PWM)输出信号的频率和占空比调节背光亮度,降低LCD和键盘背光灯功耗,实现自适应控制屏幕亮度并延长设备待机时间。
Ambient light sensor （ALS） principle and its parameters are analysis, Embedded system block diagram based on windows phone is proposed. Driver software is designed to capture Environmental light intensity from ambient light sensor, We attempt to reduce the power consumption of optical sensors by optimizing detection sensitivity. Backlight brightness is adjusted to reduce LCD and keypad backlighting power consumption according to output signal frequency and duty from Pulse Width Modulation （PWM） pin controlled by collected data. LCD screen brightness is controlled adaptive and intelligent terminal standby time is extended.
出处
《科技视界》
2013年第26期365-366,共2页
Science & Technology Vision
