RESEARCH ON HOW TO OPTIMIZE THE DISPLAY PERFORMANCE OF VFD

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One of the main purposes in trying to improve technology for making VFD is to increase the luminance of VFD and optimize its display performance. This paper deals with problems concerning the effects of such factors as the design of the device itself, its manufacturing technology and its external working conditions upon the luminance of VFD. In this paper is given a formula derived by the authors, which shows how the design of VFD affects the display performance of VFD. As is shown by the formula, the Q value(the ratio of the total effective area of the apertures in the aperture plate to that of the metal part of the grid)can be increased by narrowing the gaps between the electrodes(esp. the gap between the cathode and the grid), cutting away both the left and right sides of the grid frame and reducing the diameters of the grid filaments, hence helping increase current distribution to the anode and improve the brightness of the display; the emission efficiency Can be increased by reducing the diameters of the cathode filaments and increasing both number of the cathode filaments and the thickness of the cathode coating. As for as material and technology are concerned, make sure that the cathode undergoes a proper activation process. Luminance can be improved when fine grains of conducting substances such as In_2O_3 are mixed into the fluorescent powder to bring the upper limit of the resistivity of the fluorescent powder down to 10^4〜10^7 Ω・cm. When it comes to the conditions in which the device is used, attention should be paid to the effects of both the increased excitation power and the ambient temperature on the luminance. Tests described in this paper are carried out when VFD is working at dynamic voltages. The results show that both the plate current and the grid current become stronger as voltages at the anode and the grid go up. Yet in the zone of saturation, the anode current becomes weaker instead. This shows that VFD works better in the undersaturated zone.
社団法人電子情報通信学会の論文
2000-10-13

RESEARCH ON HOW TO OPTIMIZE THE DISPLAY PERFORMANCE OF VFD

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