A New 13T4C LTPO MicroLED Pixel Circuit Producing Highly Stable Driving Current by Minimizing Effect of Parasitic Capacitors and Stabilizing Capacitor Nodes

IF 4.6 Q2 MATERIALS SCIENCE, BIOMATERIALS
Ji-Hwan Park;Kyeong-Soo Kang;Chanjin Park;Soo-Yeon Lee
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Abstract

In this paper, we proposed a new low-temperature polycrystalline oxide (LTPO) thin-film transistor (TFT) pixel circuit for micro light-emitting diode (μ LED) displays that produces a highly stable and uniform driving current. The proposed pixel circuit suppresses the current level change along with the sweep signal due to the parasitic capacitances and compensates for the TFT's threshold voltage (VTH) variation-induced current error, including even falling shape. In addition, the proposed circuit produces a constant current regardless of the data voltage. As a result, a relative current error rate of less than 2% was achieved across all gray levels under the ±0.5 V VTH fluctuation. The proposed circuit was verified using HSPICE with a low-temperature polycrystalline silicon (LTPS) TFT and amorphous indium-galliumzinc- oxide (a-IGZO) TFT model based on the measured data. The simulation analysis confirmed that the optimal sweep signal input position and pulse width modulation (PWM) and constant current generation (CCG) parts connecting method were key design points for stable and uniform performance.
一种新型 13T4C LTPO MicroLED 像素电路,通过最小化寄生电容和稳定电容节点的影响产生高度稳定的驱动电流
本文提出了一种用于微型发光二极管(μ LED)显示器的新型低温多晶氧化物(LTPO)薄膜晶体管(TFT)像素电路,可产生高度稳定和均匀的驱动电流。所提出的像素电路可抑制寄生电容导致的电流电平随扫描信号的变化,并补偿 TFT 的阈值电压 (VTH) 变化引起的电流误差,包括均匀的下降形状。此外,无论数据电压如何变化,所提出的电路都能产生恒定的电流。因此,在 ±0.5 V VTH 波动下,所有灰度级的相对电流误差率均小于 2%。根据测量数据,使用 HSPICE 对低温多晶硅 (LTPS) TFT 和非晶铟镓锌氧化物 (a-IGZO) TFT 模型进行了验证。仿真分析证实,最佳扫描信号输入位置以及脉宽调制 (PWM) 和恒流发电 (CCG) 部件连接方法是实现稳定和均匀性能的关键设计点。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
ACS Applied Bio Materials
ACS Applied Bio Materials Chemistry-Chemistry (all)
CiteScore
9.40
自引率
2.10%
发文量
464
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