场发射显示器中双层基板结构的数值分析

Analysis of Field Emission Display with Double Layer Substrate

分析了场发射显示器(FED)中玻璃基板在大气压力下的形变和应力与玻璃基板厚度的关系,得到基板形变和应力随着其厚度的减少而急剧增大。通过研究玻璃基板表面粗糙度及其形变对于器件内部场强及碳纳米管发射电流密度的影响,得出为了保证95%以上的发射电流均匀度,低压型和高压型FED的阴极基板表面粗糙度均应在1μm以内,而阳极基板最大形变分别不超过10μm和40μm。在上述研究的基础上,提出了双层基板结构,其引入改善了FED内表面的粗糙度,同时使得12.7 cm(5 in)以下尺寸的FED屏中取消了支撑。文中还讨论了对于大尺寸屏幕的支撑配置方法。分析结果表明,双层基板结构对于改善发射均匀性和优化支撑体配置具有良好效果。

Distortion and stress of the glass substrates are introduced into a field emission display （FED） panel by atmosphere pressure. The distortion and stress increase rapidly with thinner substrates. The bumpiness and distortion of the substrate affect the electric field inside FED and the emission current. It is found that to ensure an emission uniformity of more than 95%, the bumpiness of the cathode substrate should be within 1 μm, while the anode substrate＇s distortion should be within 10μm and 40μm, according to the low voltage FED and high voltage FED, respectively. FED with double layer substrate is proposed in this paper. Such structure brings a smooth inner surface to FED and removes spacers inside the panel, in the case its size is less than 12. 7 cm（5 in） diagonal. For larger-size panels, the arrangement of spacers is designed. Calculation proved this method could improve the uniformity of emission current and optimize the spacer distribution.