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Optical Sensors in Smart Mobile Devices (2010)
| Citations: | 2 - 0 self |
BibTeX
@MISC{Industries10opticalsensors,
author = {Semiconductor Components Industries},
title = {Optical Sensors in Smart Mobile Devices},
year = {2010}
}
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Abstract
1 Publication Order Number: Smart mobile handheld platforms continue to integrate an ever increasing spectrum of functions from multiple communication standards to a wide array of user interface features and sophisticated power management. This paper explores advances in optical sensors as they apply to enhancing the user experience and extending battery life. Developments in ultra-low power optical proximity sensors are enabling distance measurement and contactless gesture detection while simultaneously supporting novel power management techniques. Integration with traditional ambient light sensors optimizes display power while maintaining satisfactory illumination. 2 The Mobile Power Budget Advances in smart mobile devices seem to occur on a daily basis as vendors roll out new models and new features. These advances are enabled and fueled by corresponding advances in the underlying silicon technology where Moore’s Law continues to operate. Moore’s Law advocates a doubling of integrated circuit components per unit cost every year 1. Moore’s Law assumed power consumption would be a non-issue. It is true that from one process generation to the next power consumption for the same on-chip feature is improving. However, any power savings are quickly consumed as even more features are added to the smart mobile devices. And most real world interfaces, such as the intensity requirements for backlit displays, are driven by human eye capabilities. Significant power improvements in backlighting are not expected in the near future. Battery technology does not track Moore’s Law. Battery technology is estimated to improve at the rate of about three percent per year 2 which equates to a doubling of performance on a 25 year cycle. Batteries are simply not keeping up with silicon technology as can be clearly seen in Figure 1. Log2 of Benefit/Cost
Keyphrases
smart mobile device moore law optical sensor battery technology silicon technology new feature wide array integrated circuit component sophisticated power management power consumption novel power management technique real world interface next power consumption distance measurement daily basis benefit cost process generation near future backlit display human eye capability intensity requirement unit cost on-chip feature traditional ambient light sensor smart mobile handheld platform significant power improvement user experience contactless gesture detection publication order number multiple communication standard ultra-low power optical proximity sensor display power satisfactory illumination mobile power budget advance user interface feature underlying silicon technology year cycle battery life new model power saving
