Microdisplay pixel circuit with high stability for wearable devices

WU Zhong; CAO Yue-xin; LI Chen

doi:10.37188/CJLCD.2022-0389

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Microdisplay pixel circuit with high stability for wearable devices

Driving and Controlling | 更新时间：2023-04-10

- Microdisplay pixel circuit with high stability for wearable devices
- Chinese Journal of Liquid Crystals and Displays Vol. 38, Issue 4, Pages: 488-494(2023)
- 作者机构：
  
  1.东南大学电子科学与工程学院，江苏南京210096
- 作者简介：
- 基金信息：
- DOI：10.37188/CJLCD.2022-0389
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WU Zhong, CAO Yue-xin, LI Chen. Microdisplay pixel circuit with high stability for wearable devices. [J]. Chinese Journal of Liquid Crystals and Displays 38(4):488-494(2023)
DOI：

WU Zhong, CAO Yue-xin, LI Chen. Microdisplay pixel circuit with high stability for wearable devices. [J]. Chinese Journal of Liquid Crystals and Displays 38(4):488-494(2023) DOI： 10.37188/CJLCD.2022-0389.

摘要

为了满足可穿戴设备对微显示器高稳定性、低工作电压的要求，本文设计了一种新型低压微显示电路及其工作时序，在一帧时间内完成晶体管阈值电压偏移的提取、储存、补偿与发光，在最大灰度下发光电流达1 017.1 nA。当阈值电压偏移量在-50~+50 mV之间时，传统微显示电路误差最大达+18.67 LSB，而所设计的微显示电路发光电流误差保持在-0.54~+0.70 LSB之间，显著提高了显示稳定性。所设计的微显示电路经HSPICE仿真验证功能正确，符合可穿戴设备的应用要求。

Abstract

In order to meet the requirements of wearable devices for high stability and low operating voltage， a novel microdisplay pixel circuit and its working timing scheme are proposed in this paper. The proposed pixel circuit extracts， stores and compensates the threshold voltage variations to reach high current stability. The maximum driving current is up to 1 017.1 nA. When the threshold voltage variation is between -50 mV and +50 mV， the maximum current error of the conventional pixel circuit is +18.67 LSB， while that of the proposed circuit is between -0.54 LSB and +0.70 LSB. It indicates that the proposed pixel circuit significantly improves the display stability， which is simulated and verified successfully by HSPICE.

关键词

可穿戴设备微显示像素电路阈值补偿

Keywords

wearable devicesmicrodisplaypixel circuitthreshold voltage compensation

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