imotion by infinitus d.o.o.

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.

 

VIEW THEME

CONTROLMOTION DIAGNOSTIC TOOL WITH REFRESHED GUI

EXPLAINING OEM LCD OPERATIONAL TEMPERATURE RANGES AND ITS EFFECT ON EXTERNAL SIGNS

TEMPERATURE EFFECT ON LCD BRIGHTNESS LIFE TIME AND POWER CONSUMPTION

BASIC DIFFERENCES BETWEEN LCD DIGITAL SIGNAGE DISPLAYS

LUMINANCE LCD OUTPUT DEPENDENCE ON INNER OUTDOOR ENCLOSURE TEMPERATURES

LCD ON-SURFACE TEMPERATURES AND OPERATION RANGE

UNDERSTANDING VISIBILITY AND RETHINKING TECHNICAL SPECIFICATIONS

3 CORNERSTONES OF UNIQUE OUTDOOR LCD IMOTION G6 TECHNOLOGY


 

TEMPERATURE EFFECT ON LCD BRIGHTNESS ITS LIFE TIME AND POWER CONSUMPTION

As outdoor LCD specialists we wish to put into perspective influence of temperature on operation of such systems with core component being LCD panel. This will give you knowledge to have easier time differentiating expected quality level of outdoor LCD systems available at the market. In short, inner enclosure temperature will influence on integrated LCD panel brightness output capacity, its life time and power consumption. That’s pretty important stuff there.

To see most instant effect of inner enclosure temperature influence, first lets take a look at few cases of outdoor LCD signs having to cope with high heat levels and solar exposure. 
Screen size/ default luminance 46“/ 1.500 nit 46“/ 1.500 nit 55“/ 700 nit 55“/ 700 nit 65“/2.000 nit 65“/2.500 nit
Inner enclosure temperature dynamics
Thermal management type


Outdoor LCD systems are constantly exposed to number of harmful effects, but most problematic of all is heat load arising from internal heating, ambient temperature and solar radiation. Only solar radiation has capacity to raise temperature of exposed spots by +55⁰C and more from inner enclosure temperature! We are talking about “boxes” with integrated powerful heating elements, being exposed to sun. That is HOT! You can check out video for quick explanation below.



Let’s quickly describe influence of inner enclosure temperature on brightness output, life time and power consumption.
 

LCD backlight output

Is essential outdoor LCD systems performance trait.  Together with high contrast ratio and antireflective glass coating it results in sunlight readable images. Every nit is valuable, so UHB (ultra high bright) LCD panels need to be used. Issue here is that brightness output capacity changes with inner enclosure temperature. Technical specifications can be slightly misleading, as they are correct only at 25±2⁰C and change quite dramatically. Inner enclosure temperature control is the main reason why outdoor LCD systems deliver so much different results, even though same LCD panels are integrated.



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. 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 5⁰C and 25⁰C, experiencing big drop in performance across other ranges. CCFL will basically stop working after enclosure temperatures reaches 65⁰C.
 

Life time/ electronics degradation

Inner enclosure temperature affects the LCD LED backlight life span. LED backlight lifespan will be significantly reduced if working in higher temperatures and if exposed to greater temperature fluctuations. In most extreme cases lifetime can almost double if temperature is lowered for as little as 10⁰C.


Power consumption

Self-heating and exposure to solar load on outdoor lcd systems is certainly relevant. Resistivity quantifies how strongly given material opposes the flow of electrical current. The resistance of metal increases linearly with temperature. That is reason why ventilation based systems can have increased power consumption of components up to 30% from specified values. This is significant difference when using ultra high bright LCD panels.







 
Email us
Follow us on twitter
Follow us on linkedin
Follow us on Google +
SIGN UP FOR OUR NEWSLETTER
IMOTION BY INFINITUS D.O.O. © 2018