No abstract

Samsung SDI has developed 2.6-inch full color VGA Active Matrix Organic Light-Emitting Diode (AMOLED) display with the world's highest resolution of 302ppi using Laser Induced Thermal Imaging (LITI) method with the top emission structure. A voltage compensating pixel circuit with 2µm design-rule in lowtemperature poly-Si (LTPS) thin film transistors (TFTs) was introduced to compensate the variation of the threshold voltage (Vth) in order to improve the image quality. Moreover, an aperture ratio of ~40% was obtained for each pixel even though the sub-pixel pitch was 28um. The luminance for the white color was 200cd/㎡ and color gamut was 74% compared to national television standard committee (NTSC) standards. These results show the possibility of high-resolution AMOLED display incorporating the LTPS technology and LITI method for digital mobile era applications in the near future.

Abstract. Demand for high speed digital transmission on ordinary phone lines motivates the introduction of VDSL. This paper investigates the VDSL transmission environment. The channel is shown to be difficult for high speed digital transmission and sophisticated signal processing methods are required for reliable transmission. This paper also describes various transmission schemes that are proposed to support high data rates in the difficult transmission environment. Two schemes, SDMT and QAM/CAP, are compared in terms of SNR margins and computational complexity.

A novel structure for poly-Si thin film transistors (TFTs) and its fabrication method were proposed to improve I-V characteristics of the TFTs by self-aligned lightly doped drain (LDD) / offset structure fabricated by formation of sidewall on both sides of the gate electrodes. In this structure, a capping layer is used to electrically isolate the gate lines from the data lines and to control the LDD/offset length. On forming the sidewall, the gate insulator was simultaneously etched to open source/drain region on the active poly-Si layer. In this work the LDD/offset structure was achieved by using only simplified 3-mask process, eliminating typical process steps for interlayer deposition and contact hole opening.

RGB adjustable gamma compensation circuit to choose one of the three different gamma characteristics for each color has been integrated by LTPS TFT for AMOLED. A timing controller to generate all timing signals for a 6-bit data driver and a scanning driver has also been integrated by the TFT on the AMOLED panel.