1keV以下的电子荧光及四极彩色荧光显示器结构探讨

STUDY ON ELECTRONIC FLUORESCENCE BELOW IkeV EXCITATION AND STRUCTURE OF TETRODE COLOR VFD

本文分析了开发彩色荧光显示器(VFD)所存在的问题;论述了带螺旋端点阴极、前发光型四极平板VFD的结构;探讨了在新型VFD中使用Y_2O_2S:Eu、ZnS:Cu,Al和ZnS:Ag为三基色发光材料、在阳极电庄≤1keV时实现彩色显示的原理,并给出了一个有十二种发光颜色的频谱显示器件的实例.

In low energy electron luminescence, the electron accumulation and nonradiative recombination on the surface of phosphors is one of the main resistance in developing vacuum fluorescent display (VFD) devices. Y2O2S:Eu,ZnS:Cu, Al and ZnS:Ag are used as a kind of three-primary phosphor, excited by 400~lkeV electrons in color VFDs with the luminous efficience of R: 2.61m/W, G: 10.2 1m/W and B: 1.7 1m/W by 1keV excitation. In order to obtain the device with low threshold voltage and high luminous efficiency, a very thin phosphor layer is applied.To fit this three-primary phosphor for VFD, a special structure of display device is designed. This device has the following characters: ( 1 ) a tetrode structure with two layers of wire-shaped grid, so that the device can be addressed with low driving voltage by ICs; (2 ) a front luminous type, to widen the viewing angle; ( 3 ) a set of cathode with two spiral ends, to reduce the cold end from the length of more than 5mm to about 1mm.Based on above discussion, we developed a vacuum fluorescent display device with twelve color phosphors printed in a format of 10(column)XXXXXXXXX12 (row) and operated at the anode voltage of 500V.In each column, there are 12 colors. They are pink, red, reddish orange, orange,yellowish orange, yellow, green, bluish green, blue green,greenish blue,blue and purple. This device can be used in a Hi-Fi audio system for spectrum display.