基于IGZO的5.5 in FHD In-cell触控FFS面板设计

为了达到便携移动终端日益轻薄的要求,In-cell Touch技术是触控的最佳选择。目前,非晶铟镓锌氧化物薄膜晶体管(a-IGZO TFT)越来越受到人们的关注,与传统的硅基TFT相比,IGZO拥有其相应的优势,并且制造成本较LTPS TFT低廉,制备过程容易掌控。为了将IGZO材料的优点运用在触控显示面板上,设计了一款5.5in FHD In-cell Touch面板。为了实现FHD的分辨率,首次采用IGZO-TFT模型设计多工器(MUX),并用它驱动本文所述的面板。通过检测,触控的信噪比达54dB以上。在文章最后展示了基于此次设计成功做出的样机。本文对实现自容式多点in-cell触控的关键结构做了简单的介绍,针对在试做过程中遇到的寄生电容问题做了详细的分析,并描述了相应的解决方法。将IGZO技术与In-cell Touch技术融合,能够在较简单的工艺下达到高规格触控面板的需求。

Design of 5.5 in IGZO TFT FFS In-Cell touch panel

In order to achieve the increasingly frivolous mobile terminal requirements, In-cell Touch technology is the best choice for touch control. At present, the Amorphous Indium Gallium Zinc Oxide Thin Film Transistor (a-IGZO TFT) has attracted more and more attention. Compared with the traditional silicon-based TFT, IGZO have their respective advantages, for example, the manufacturing cost is lower compared to LTPS TFT, and the process is easy to control. This paper introduced the design of 5.5 in FHD In-cell panel based on IGZO technology. The IGZO-TFT model is used to design the multiplexer (MUX) for the first time and drive the panel described in this paper. The SNR value of the final prototype is optimized to reach 54 dB. At the end,the paper shows the demo of this design. We briefly introduced the key structure of self-capacitance multiple in-cell touch. We analyzed the problems caused by parasitic capacitance in the producing, and described the solution of them. With integration of the IGZO technology and In-cell Touch technology, we can get a high specification touch panel in a relatively simple process.