New Solar Cell Enhanced LCDs Could Improve Mobile Device Battery Life
Subject: Displays, Mobile | August 12, 2011 - 08:51 AM | Tim Verry
Tagged: solar cell, mobile, lcd, display
According to Ars Technica, researchers at UCLA announced on Tuesday a new LCD screen containing photovoltaic cells that promises to reduce back-light energy waste and improve battery life on mobile devices.
My N900 eats up battery with an hour of Angry Birds, but can go for two days with the display off. Where's my happy medium?
The researchers have placed what they are calling polarizing organic photovoltaics inside the LCDs in such a way that light that is normally filtered out and blocked in areas to create the displayed images can now be (mostly) recovered. While the process does not result in 100% reclamation of energy due to energy loss during the conversion process(es) and heat given off by the back-light, in a mobile device any amount of energy that can be recovered is desirable. Ars Technica states that up to 90% of a battery’s power is used to power the back-light of the display. Further, of that percentage, up to 75% is lost to the polarizing layers. By infusing the polarizing layer with photovoltaic cells and reclaiming as much of the otherwise wasted light as possible, battery life could be dramatically extended.
Mobile devices are getting beefier multi-core processors and graphics chips, numerous wireless radio connections (4G, WiFi, Bluetooth), and large power hungry displays; however, battery technology advancements have been rather stagnant and flat. As a result of this, having to make processors, displays, and other components as efficient as possible to make up the difference of battery technology not keeping up with other advancements, interesting tweaks like the photovoltaic infused displays become that much more important.
Whether this particular technology will catch on and work as well as they claim remains to be seen; however it is nonetheless an interesting experiment. More data on the researchers’ project will be published in the Advanced Materials journal in September 2011. What are your thoughts on the idea?