Taiwan-based TPK Holdings Ltd. has been awarded a contract from Apple to supply between 70% and 80% of the touch panels for its upcoming fifth-generation iPhone, Taiwan Economic News reports. Referring to the next-generation smartphone as the “iPhone 4S,” the publication cites unnamed industry insiders with the report. TPK holdings is currently the world’s largest touch panel maker by volume, and is said to be the only manufacturer able to meet Apple’s steep quantity demands while maintaining consistent quality. TPK Holdings is already Apple’s top touch panel supplier and the unparalleled quality of Apple’s current touch experience makes the retention of its current No. 1 supplier a logical move. The Taiwan-based component manufacturer also supplies touch panels to HTC, Amazon and Barnes & Noble, among others. Apple is expected to launch its fifth-generation iPhone handset this fall.