Electron device having brightness indicating driving circuit

A technology for driving circuits and electronic devices, which can be used in measuring devices, projection devices, measuring electricity, etc., and can solve problems such as high price

Inactive Publication Date: 2004-10-20
QUISDA CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, the above-mentioned cold light plate driver chip 300 has disadvantages such as hi...

Method used

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  • Electron device having brightness indicating driving circuit
  • Electron device having brightness indicating driving circuit
  • Electron device having brightness indicating driving circuit

Examples

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Embodiment Construction

[0030] Figure 4 It is a circuit block diagram showing an electronic device with a brightness display driving circuit disclosed in the present invention. Figure 4 The electronic device shown includes: an alternating current device 1; a second load 2 (brightness display unit); The AC device 1 picks up AC current to drive the second load 2 .

[0031] The AC power device 1 includes a first load 10 ; and an AC drive unit 11 that provides AC current to drive the first load 10 . Wherein, when the above-mentioned first load is used, the current flowing through the above-mentioned first load will become smaller after being aged for a long time.

[0032] The above driving circuit 500 includes a current comparator 3 ; and a conversion device 6 . The above-mentioned current comparator 3 includes at least a first winding 4 and a second winding 5; the above-mentioned first winding 4 is connected in series between the above-mentioned first load 10 and the above-mentioned AC drive unit 1...

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PUM

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Abstract

An electronic device with brightness indication driving circuit features that the alternative current of an AC unit in the electronic device is used to drive a brightness indicator (such as cold light plate), and the indicated brightness can be used to judge the service life of said AC unit.

Description

technical field [0001] The invention relates to an electronic device with a driving circuit, in particular to an electronic device with a brightness display driving circuit. Background technique [0002] Currently on the market, Electroluminescent Lamp is widely used in various home appliances. It has the advantages of ultra-thin, not easy to heat, power saving and vivid colors. For example, some projectors (Video Projector) just use cold light panels to shine on their trademarks (Mark), so that the effect of advertisements can also be seen at night. [0003] Generally speaking, cold light panels need a power converter to provide the AC power they need. Such as figure 1 As shown, 300 is a cold light plate driving chip used in a traditional projector and 200 is a cold light plate. Wherein, the above-mentioned cold light panel driving chip 300 has disadvantages such as expensive to use and need to add protection circuit or electrical isolation to comply with safety standar...

Claims

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Application Information

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IPC IPC(8): G01R31/00G03B21/14
Inventor 陈专助
Owner QUISDA CORP
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