The study of Low temperature Poly-Silicon (LTPS) thin film transistor LCDs and touch panel devices have grown rapidly in recent years. The former technology is capable of fabricating compact and high resolution display by integrating the driving circuitry on peripheral area of display. The latter technology allows LCDs to become a better human-computer interaction device....[ Read more ]

The study of Low temperature Poly-Silicon (LTPS) thin film transistor LCDs and touch panel devices have grown rapidly in recent years. The former technology is capable of fabricating compact and high resolution display by integrating the driving circuitry on peripheral area of display. The latter technology allows LCDs to become a better human-computer interaction device.

A new design of LCD driving circuitry using p-type transistors is developed. Such design allows lower cost and simpler fabrication process of poly-silicon TFT LCD panel. Hence, process yield rate can be improved. The design is based on an in-house developed TFT technology with enhanced mobility and on-state current comparing to conventional polysilicon devices. I-V characteristics of such devices have been modeled. Design consideration, simulation and layout construction technique have been discussed.

A transparent, projected capacitive touch panel consisting of a single layer of patterned ITO on glass has been developed. This design provides a lower-cost more transparent alternative to conventional two-layer projected-capacitive touch sensing. Moreover, the proposed design is capable of detecting multiple simultaneous touch points. Both field projection and charge-sensing circuitry are discussed and demonstrated.