Patent ID: 7078769
Filing Date: 2006-07-18
Classification: G11C,H01L

Abstract:
1. A cellular phone comprising: a main body; a voice input section; a voice output section; manipulation switches; and a display device having a nonvolatile memory, wherein the nonvolatile memory comprises a plurality of memory cells being arranged in a matrix form, each of the memory cells including a memory TFT and a switching TFT, wherein the memory TFT comprises: a first semiconductor active layer formed over a substrate; a first gate insulating film formed over the first semiconductor active layer; a floating gate electrode formed over the first gate insulating film; an anodic oxide film formed by anodizing the floating gate electrode; and a control gate electrode formed over the anodic oxide film, wherein the switching TFT comprises: a second semiconductor active layer formed over the substrate; a second gate insulating film formed over the second semiconductor active layer; and a gate electrode formed over the second gate insulating film, wherein the memory TFT and the switching TFT are integrally formed over the substrate, wherein the first semiconductor active layer of the memory TFT is thinner than the second semiconductor active layer of the switching TFT.