Electronics and the environment ET 4407 LED backlight

Electronics and the environment ET 4407 LED backlight LCD versus fluorescent backlight LCD

Outline • Introduction • SLCA for both LCD’s • Explanation of the SLCA • Target Plot • Conclusions

LED backlight LCD versus Fluorescent backlight LCD • Both LCD TV's are designed the same way. • The difference is the backlight. • LED backlight LCD T. V. uses light emitting diodes to display the image.

LED backlight LCD versus Fluorescent backlight LCD • While the Fluorescent LCD T. V. uses a Cold Cathode Fluorescent Lamps i. e. CCFL • The aim is to analysis which is more environmentally friendly by the use of SLCA

SLCA • The SLCA consists of a 3 x 6 matrix • SLCA takes a look at both LCD TV’s under the headings of global warming potential, resource depletion and toxicity • With these headings our aim is to analysis them at the levels of resource extraction, manufacturing, transportation, product use, re-cycling and disposal.

Completed SLCA • 0=Terrible 1= Very Bad 2= Bad 3= Average 4= Good 5= Excellent

Explanation of the SLCA • First of all I will look at the TV’s under their global warming impacts. • Secondly, I will look at the TV’s under their resource depletion impacts. • Finally, I will look at the TV’s under their toxicity impacts.

Global Warming Impacts • For the LED backlight TV, the likes of arsenic and gallium have to be mined. • For the Fluorescent backlight LCD TV, mercury and phosphorus have to be mined • Mining has a serious impact on global warming, as seen in a previous presentation “what’s the problem”

Global Warming Impacts • As the LED are based on semiconductor • • • technology, the manufacturing of them has a serious impact on global warming. This is because semiconductor manufacturing uses high energy consumption. While the manufacturing of the CCFL uses less energy and is cheaper. The main worry for the CCFL is the mercury.

Global Warming Impacts • The transportation of both types of TV’s are the exact same. • Therefore have the same impact on global warming

Global Warming Impacts • In the case of product use, the LED backlight TV uses 40% less power consumption than the CCFL. • The LED can be switched on and off more quickly than the CCFL.

Global Warming Impacts • The end of life treatment of the LED is by far better than of the CCFL. • The LED can be re-cycled while the CCFL requires dedicated disposal because of the mercury and phosphorous. • Overall the LED backlight TV is much better on an global warming front.

Resource Depletion • The likes of arsenic and gallium will deplete after time like all resources. • But the likes of mercury is very rare.

Resource Depletion • The manufacturing of the LED backlight TV would use a lot of resources as the energy consumption is high

Resource Depletion • The transportation of the TV’s is N/A in this case. • This is because a typical Samsung LCD TV of both types are exactly the same packaging and transport cost.

Resource Depletion • The LED backlight TV uses lesser power so therefore is better than the fluorescent backlight TV. • Therefore there is less power consumption from the home.

Resource Depletion • Once again the LED can be re-cycled, while the CCFL would have to be disposed of in a landfill.

Toxicity • Both TV’s have harmful materials to mined. • The manufacturing of the LED requires more • • • power so therefore would be more harmful. The transportation of the two types of TV’s are the same Because the CCFL have to disposed off and contain mercury they are dangerous when they come to the end of life. On the other hand the LED can be fully recycled.

Target Plot

Conclusions • The SLCA score total was 50: 24 in favour of the LED backlight LCD TV. • From the SLCA the LED LCD is a lot more environmentally friendly. • LED backlight LCD TV are the future. • There is progression in this area with the introduction of a sidelight LCD TV. • This type of TV contains LED around the edge of the screen which disperse the picture along the screen. • http: //www. youtube. com/watch? v=IKVp 9 Q-Z 220 http: //www. youtube. com/watch? v=Vns. Zvf 3 SJn 4 http: //www. youtube. com/watch? v=c 1 Zp. Ui. BQi. HE