显示屏表面空气式静电放电实验特性

徐晓英; 舒晓榕; 刘鹏宇; 甘瑛洁; 张成铭

doi:10.11884/HPLPB201931.190035

显示屏表面空气式静电放电实验特性

doi: 10.11884/HPLPB201931.190035

1.
武汉理工大学物理系, 武汉 430070
2.
ESDEMC 科技有限公司, 罗拉 65401

基金项目:

国家自然科学基金项目 11775164

刘尚合院士专家工作站静电研究基金项目 BOIMTLSHJD20161005

详细信息

作者简介:
徐晓英(1957—)，女，博士，主要从事静电放电、电磁兼容和数值计算方面的工作; xu_xiao_ying@126.com

中图分类号: O441.1
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出版历程
- 收稿日期: 2019-02-15
- 修回日期: 2019-04-11
- 刊出日期: 2019-07-15

Experimental characteristics of surface discharging for air electrostatic discharge on display

1.
Department of Physics, Wuhan University of Technology, Wuhan 430070, China
2.
ESDEMC Technology Limited Liability Company, Rolla 65401, USA

摘要

摘要: 显示屏是人机交互的重要部件，当人体静电放电发生在显示屏表面时，有可能导致软硬故障。为了研究显示屏空气式静电放电实验特性，通过一个自制的装置对显示屏空气式静电放电电流和通过显示屏的位移电流进行了实验测量。研究发现：放电电流峰值随接近速度的增加而增加，上升时间随接近速度的增加而减小。在±10~±12 kV电压范围，受电弧长度的影响，上升时间增大，电流峰值变小。随着测量点与放电点之间距离的增大，位移电流波形峰值减小、上升时间增大，正极性放电峰值更大且扩散范围更广，而负极性放电上升时间增大更加明显。由位移电流波形及其分布可以计算出电荷密度。电荷密度随距离放电位置距离的增大而减小。与正极性相比，尽管负极性放电电流峰值较低，但电荷密度较高，说明负极性放电具有造成更高等级损伤风险的危害。
- 静电放电 /
- 空气放电 /
- 电流峰值 /
- 上升时间 /
- 位移电流 /
- 电荷密度
Abstract: The display is an important part of human-computer interaction. When the human body electrostatic discharge occurs on the surface of the display, it may lead to hardware and software faults. In order to study the experimental characteristics of air electrostatic discharge on display, the air electrostatic discharge current and the displacement current through the display screen were measured by a self-made device. It is found that the peak value of discharge current increases with the increase of approaching velocity, and the rising time decreases with the increase of approaching velocity. In the voltage range of ±10-±12 kV, the rise time increases and the peak current decreases under the influence of arc length. With the increase of the distance between the measurement point and the discharge point, the peak value of the displacement current waveform decreases and the rising time increases. The peak value of the positive polarity discharge is larger and the diffusion range is wider, while the rising time of the negative polarity discharge is more obvious. The charge density can be calculated from the displacement current waveform and its distribution. The charge density decreases with the distance of discharge position increasing. Although the peak value of negative polarity discharge current is lower than that of positive polarity, the charge density is higher.This indicates that the negative polarity discharge has a higher damage risk.
- electrostatic discharge /
- air discharge /
- peak current /
- rise time /
- displacement current /
- charge density

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图 1 测量系统示意图

Figure 1. Schematic diagram of measuring system

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图 2 无火花表面电晕电流和通过显示器的位移电流

Figure 2. Sparkless surface corona current and displacement current paths into the display

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图 3 测量位移电流的PCB板结构

Figure 3. Displacement current measuring PCB structure

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图 4 放电电流波形

Figure 4. Discharge current waveform

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图 5 不同接近速度的放电电流峰值

Figure 5. Peak current at different speeds

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图 6 不同接近速度的上升时间

Figure 6. Rise time at different speeds

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图 7 放电电压±8 kV的位移电流

Figure 7. Displacement current at discharge voltage ±8 kV

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图 8 放电电压±12 kV的位移电流

Figure 8. Displacement current at discharge voltage ±12 kV

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图 9 用来计算表面电荷密度的几何形状

Figure 9. Geometry used to calculate the surface charge density

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表 1 位移电流波形电流峰值

Table 1. Peak of displacement current waveform

discharge voltage/kV	total peak current/A	peak current/A
discharge voltage/kV	total peak current/A	patch 1 (discharge center)	patch 2	patch 3	patch 4	patch 5
8	5.57	1.59	0.74	0.43	0.26	0.12
-8	-2.43	-0.89	-0.46	-0.07	—	—
12	5.40	1.75	0.96	0.43	0.19	0.11
-12	-1.35	-0.57	-0.21	-0.07	—	—

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表 2 位移电流波形上升时间

Table 2. Rise time of displacement current waveform

discharge voltage/kV	rise time of total current/ns	rise time/ns
discharge voltage/kV	rise time of total current/ns	patch1 (discharge center)	patch2	patch3	patch 4	patch5
8	0.41	0.46	1.67	3.78	4.05	4.27
-8	0.34	0.69	2.08	9.24	—	—
12	0.62	0.95	1.27	1.67	4.40	6.57
-12	1.57	4.08	4.58	7.39	—	—

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表 3 不同的贴片和极性的表面电荷密度(单位: nC/cm²)

Table 3. Surface charge densities for different patches and polarities(units: nC/cm²)

discharge voltage/kV	center circle (discharge center)	annulus 2	annulus 3	annulus 4	annulus 5
8	47.06	6.05	2.46	1.2	0.67
-8	59.78	5.06	0.71	—	—
12	75.73	8.60	2.93	1.06	0.45
-12	94.77	7.00	1.42	—	—

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