Built-in solar cells for mobile phone terminals

Nowadays mobile phones have become widespread over the entire globe, where users can make calls, send short messages and even browse the internet using UMTS. There is a clear market need in continuously improving their design and versatility. GSM system for example is designed to cope with the customer requirements in terms of battery consumption from one hand and quality of service from the other hand. With the forthcoming emerging technologies such as GPRS and UMTS the users will need more and more battery life due to the continuous data transmission over the Air Interface. In fact Data terminals will require a full power usage unlike in speech applications where DTX or Discontinuous Transmission is normally implemented in all Mobile Speech Systems. Moreover with the UMTS terminals users might use video conferencing facilities, which will be more critical for battery consumption because not only of Data transiting Uplinks and Downlinks but of LCD Screens consumption as well. With this built-in solar cell system, Mobile Phone Users will be able to charge their battery phones almost everywhere there is sufficient light : in trains, airplanes, on the beach in mountains, in shopping malls, etc.