A Digital Driving Technique for an 8b QVGA AMOLED Display Using ∆Σ Modulation

📋 论文概要

该论文提出了一种基于ΔΣ调制的数字驱动技术，用于8位QVGA AMOLED显示屏，旨在解决薄膜晶体管阈值电压漂移问题。通过采用2TFT1C像素结构替代传统多晶体管补偿方案，降低了面板复杂度并提高了良率和开口率。

💡 主要创新点

• 首次将ΔΣ调制应用于AMOLED数字驱动，避免了复杂的模拟补偿电路，简化了像素设计。
• 采用仅含2个TFT和1个电容的像素单元，相比传统4TFT及以上结构，大幅降低面板复杂度并提升开口率。
• 有效补偿了TFT阈值电压漂移，提高了显示均匀性，同时保持8位灰度精度。

🏷 关键词

📄 原文摘要

Purdue University, West Lafayette, IN LG Electronics, Seoul, Korea 2 Active-matrix organic LED (AMOLED) is one of the most promising contenders for next-generation displays. However, the VT-shift issue in thin-film transistors (TFT) has to be addressed to enable wide deployment [1]. Voltage programming and current programming are well-known VT-shift-compensation techniques for analog driving. However, they all need more than 4 TFTs per pixel, which increases the panel complexity and decreases yield and aperture ratio. Recently, a VT-shift compensation technique that uses a 2TFT1C pixel in an analog driving AMOLED has been reported [2]. However, it requires OLED supply voltage programming, and shows a 14% variation in OLED current after VT-shift compensation, which is not enough for highdefinition applications. Digital driving has been proposed as an alternative to mitigate the VT-shift issue with a simple pixel structure and to provide

👥 作者与机构

Jae Hyuk Jang1, Minho Kwon1, Edwin Tjandranegara1, Kywro Lee2, Byunghoo Jung1