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Article: Using light sensors to extend battery life.(FOCUS ON TECHNOLOGY: POWER MANAGEMENT)
- Article from:
- Wireless Design & Development
- Article date:
- February 1, 2008
- Author:
CopyrightCOPYRIGHT 2008 Advantage Business Media. This material is published under license from the publisher through the Gale Group, Farmington Hills, Michigan. All inquiries regarding rights should be directed to the Gale Group. (Hide copyright information)
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Ambient light sensor technology plays a key role in power management strategies for display products. This article compares various ambient light sensor technologies and explains by properly applying the ambient light sensing in conjunction with LED backlight driving, one can significantly reduce power consumption and increase battery life in a portable/cell phone system. These advances are discussed with respect to two application examples: an ambient light sensor for a laptop and cell phone display.
Types of Ambient Light Sensors
A selection of optical sensors is shown in Table 1. They are arranged from left to right in order of complexity. Considering ...