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Confirmation of vacuum fluorescent display luminous efficiency computing method

A technology of luminous efficiency and calculation method, which is used in photometry, optical instrument testing, machine/structural component testing, etc. question

Active Publication Date: 2009-07-08
SHANGHAI UNIVERSITY OF ELECTRIC POWER +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, the determination of the luminous efficiency of a vacuum fluorescent display requires many test parameters and the testing process is relatively complicated. So far, there have been no research reports on the measurement and calculation of the luminous efficiency of VFDs.

Method used

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  • Confirmation of vacuum fluorescent display luminous efficiency computing method
  • Confirmation of vacuum fluorescent display luminous efficiency computing method
  • Confirmation of vacuum fluorescent display luminous efficiency computing method

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Experimental program
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Embodiment

[0042] Taking VFD20-0704N (green powder) as an example, the anode current and brightness are measured through experiments, and the calculation method of luminous efficiency is determined.

[0043] 1. Determination of parameters by experimental measurements

[0044] Light-emitting area S of VFD20-0704N (green powder) b , duty cycle D u and anode voltage E b The range is shown in Table 1.

[0045] Table 1 The luminous area S of 20-0704N (green powder) b , duty cycle D u and anode voltage E b scope

[0046]

[0047] VFD20-0704N (green powder) with different anode voltage E b lower anode current I b and the measured values ​​of brightness L are shown in Table 2.

[0048] Table 2 Anode current I of VFD 20-0704N (green powder) b , luminance L and luminous efficiency η experimental values

[0049]

[0050] 2. Determination of the experimental value of luminous efficiency

[0051] Combined with the luminous area S of VFD20-0704N (green powder) in Table 1 b , duty cy...

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Abstract

The invention discloses a method for calculating luminous efficiency of a vacuum fluorescent display. The invention measures the anode current and brightness of each sample in experiment through selection of VFD made from eight color fluorescent powders, applies a Weibull distribution function to describe the distribution of luminous efficiency, utilizes a right approaching method to quantificationally research the influence of the anode voltage on the luminous efficiency of the VFD and finally gives the method for calculating the luminous efficiency of the VFD along the change of the anode voltage. The method has the advantages that: by adopting the method, a formula for calculating the luminous efficiency of the VFD with different types made from eight color fluorescent powders can be obtained; and the formula does not need experiment to measure the anode current and brightness, can accurately and rapidly obtain the luminous efficiency of the VFD only according to the design value of the anode voltage of the VFD and provides powerful and reliable guidance meaning for manufacturers and research and technical personnel to further accurately calculate the brightness property of the VFD and developing a high-brightness and low-voltage VFD product.

Description

technical field [0001] The invention relates to a determination method for calculating the luminous efficiency of a vacuum fluorescent display, and belongs to the field of vacuum fluorescent displays. Background technique [0002] Vacuum Fluorescent Display (VFD for short) is a self-luminous display device developed from vacuum electron tubes. It has high luminous brightness, easy multi-color display, small size, wide viewing angle and long life; it can be driven by low voltage. , Easy to match with integrated circuits and other advantages, so it is widely used in various fields such as home appliances, automobiles, office automation equipment and industrial instrumentation. Luminous efficiency is a very important physical quantity to measure the quality of VFD light-emitting devices, and it is also an important indicator that directly reflects the luminous performance of VFD. In order to improve the luminous performance of VFD, in addition to its working mechanism, structu...

Claims

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Application Information

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IPC IPC(8): G01M11/00G01J1/00G01R19/00G01R31/00
Inventor 张建平
Owner SHANGHAI UNIVERSITY OF ELECTRIC POWER