阳极电压对真空荧光显示器发光效率的影响

Effect of anode voltage on luminous efficiency of vacuum fluorescent display

文章以由绿粉制作的3种型号(20-0704N、25-1217FN(B)和40-1004NA)VFD作为实验样品,按照产品检验规范条件,实测每个样品的阳极电流和亮度,应用威布尔分布函数描述其发光效率分布,利用右逼近法定量研究了阳极电压对VFD发光效率的影响,最终得到了绿粉VFD发光效率统一的计算公式;研究结果表明,实验设计方案切实可行,VFD的发光效率随阳极电压变化服从三参数威布尔分布并呈非线性递减关系,发光效率的威布尔拟合公式很精确,在VFD设计之初只需根据阳极电压设计值就可确定VFD的发光效率。

Three VFD types（20-0704N,25-1217FN（B） and 40-1004NA） produced by green powder are used as test samples in this paper.According to the norms of product testing,the anode current and the luminance of each sample are measured under each step of anode voltage.The unified calculation formula of the luminous efficiency for VFD is achieved by applying Weibull function in describing luminous efficiency distribution and right approximation method in studying the effect of anode voltage on the luminous efficiency quantitatively.The research results show the test design scheme is correct and feasible.The luminous efficiency of VFD submits to three-parameter Weibull distribution,which decreases nonlinearly when anode voltage increases.The Weibull fitting formula of VFD luminous efficiency has very high accuracy,which makes it possible to determine the luminous efficiency based on the designed value of anode voltage at the beginning of VFD design.