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TECHNOLOGY

Outdoor LCD enclosure market is quite confusing with many suppliers offering solutions of much different quality to system integrators and end customers. It is important to better understand requirements of electronics to be able to differentiate between options and evade danger of wasting resources.

 

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TEMPERATURE EFFECT ON LCD BRIGHTNESS LIFE TIME AND POWER CONSUMPTION

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LUMINANCE LCD OUTPUT DEPENDENCE ON INNER OUTDOOR ENCLOSURE TEMPERATURES

LCD ON-SURFACE TEMPERATURES AND OPERATION RANGE

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LUMINANCE LCD OUTPUT DEPENDENCE ON INNER OUTDOOR ENCLOSURE TEMPERATURES

If there is one additional piece of information needed to understand performance of outdoor LCD system, it should be its inner enclosure temperatures and its fluctuation. It will give you best clue of how good LCD panel operates, and how roughly are electronics treated within outdoor LCD enclosures.

So why do systems deliver so much different results, even though same LCD panels are integrated!? Major part of answer can be seen in the graph below. It presents backlight output dynamics in regard to different ambient temperature (inner enclosure temperature in case of full outdoor LCD digital signs) for both CCFL and LED backlight LCD illumination.

 

Graph above basically allows us to understand why combination of IP65 enclosure and high bright LCD panel are not enough for full outdoor LCD system operation. After combining both BIG factor of thermal conditions comes, which has great effect on final result.

LED backlit LCD operate better in colder temperature environments (due to lower resistance) and can operate through wider temperature range, CCFL backlit LCD will have narrow range of operation and its performance will depend more on ambient temperature. While simple rule applies to LED with "colder is better", CCFL will actually perform best in range between 5°C and 25°C, experiencing big drop in performance across other ranges. CCFL will basically stop working after enclosure temperatures reaches 65°C.


Remember, widest "warranted" operational range of any LCD is 0°C-50°C (no matter panel on-surface temperature capabilities)!

Therefore we can conclude there are systems out there:
                                              
Capable of sustaining warranted temperature Delivering supreme temperature conditions System incapable of delivering normal LCD and electronics operation environment as allowing +50°C temperatures within  the enclosure




 
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