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Method for confirming brightness characteristic of vacuum fluorescent display

A determination method and display technology, applied in static indicators, instruments, measuring devices, etc., can solve problems such as shortening development time, and achieve the effect of shortening development time and improving success rate

Active Publication Date: 2011-01-12
SHANGHAI UNIVERSITY OF ELECTRIC POWER +1
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Problems solved by technology

[0004] The present invention aims at the lack of empirical formulas for calculating the luminance characteristics of vacuum fluorescent displays in the existing domestic market, and proposes a method for determining the luminance characteristics of vacuum fluorescent displays. k (mA), anode current I b (mA), gate current I c (mA), average current density J ave (mA / cm 2 ), brightness L(cd / m 2 ) and the empirical formula for calculating luminous efficiency η (lm / W), improve the success rate of new product development, shorten the development time, and provide theoretical basis and design specifications for the optimal design of VFD structure

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  • Method for confirming brightness characteristic of vacuum fluorescent display
  • Method for confirming brightness characteristic of vacuum fluorescent display
  • Method for confirming brightness characteristic of vacuum fluorescent display

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Embodiment Construction

[0012] 1. Cathode filament heating characteristics

[0013] VFD uses thermal electron emission to work. When the working temperature of the filament is low, the relationship between the emission current and the temperature of the filament is exponential, which is called the working and temperature limited area, and the emission current is difficult to keep stable. When the working temperature of the filament is high, the cathode current has nothing to do with the temperature of the filament, but only depends on the grid and anode voltage, when the grid voltage E c and positive pressure E b When equal, the cathode current rises with the 3 / 2 power of the gate voltage, and this state is called the space charge limited region. In order to stabilize the emission current, always make the cathode operating temperature slightly higher than the temperature in the temperature-limited area. But too high is not good, it will reduce the life of the cathode.

[0014] 2. Volt-ampere chara...

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Abstract

The invention relates to a determination method of the brightness characteristic of a vacuum fluorescence display, which works out calculation experience formulas for determining filament emission current I<k>(mA), anode current I(mA), grid current I<c>(mA), average current density J<ave>(mA / cm<2>), brightness L(cd / m<2>) and luminescence efficiency Eta(lm / W), which has extremely strong guidance significance for the designer to develop displays with high brightness and low voltage such as automobile screen brightness; furthermore, the yield of the new product development can be improved, the development time can be shortened, and theoretical basis and design norms can be provided for the optimized VFD structure design.

Description

technical field [0001] The invention relates to a method for calculating brightness characteristics, in particular to a method for determining the brightness characteristics of a vacuum fluorescent display. Background technique [0002] Vacuum Fluorescent Display (VFD) is a term specially stipulated by SID (Society for Information Display) and SAE (Society of Automotive Engineers). It is a vacuum display device developed from a vacuum tube. It uses the fluorescent powder on the anode to be bombarded by electrons to emit light. It is a self-luminous display device with small size, wide viewing angle, high brightness, long life, wide temperature adaptability range, and easy to make multi-color display; low driving voltage, It is easy to match with semiconductor integrated circuits and has high reliability. Therefore, it has been widely used in household appliances, electronic weighing instruments, instruments, communication equipment, OA and other fields. [0003] At the begi...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G09G3/22G01R31/00
Inventor 张建平
Owner SHANGHAI UNIVERSITY OF ELECTRIC POWER
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