Nichia Cree Silan Epistar LED display

Is there any different between LEDs used to produce an LED display? What is the comparison between Nichia, Cree, Silan, Epistar and others? Which is more recommended to achieve a good LED Display?

Thats a big question with a complex answer. As short as I can.

Nichia and Cree are probably the best, and most expensive.

Next down in terms of quality are Taiwanese chips, Everlight etc.

At the bottom of the quality table are the low cost Chinese Chips - Silan etc.

The difference in price between the same display built with good quality LED's compared to the lowest quality can be huge. A low cost LED can reduce the price by as much as 60%.

From new there will not appear to be much difference in appearance between an expensive display and a low cost one. But very soon the low cost one will start to have more failures, colours will fade more unevenly and there may be spares supply issues over the life of the display.

Common sense says that if you pay over 2 times more for the 'same thing' that there has to be a quality tradeoff.

Beware of companies who claim to offer a good quality LED like Cree, but will actually only buy the chip and then package it themselves. It's a bit like buying a Mercedes car without an engine and then getting the dealer to fit their own engine. It will never be as good!

A good guide as to the quality of the Screen manufacturer is to ask them what LEd's they quote as standard. If it is a high quality, high price LED then the screen manufacture is probably quite good. If it is a low cost chip like Silan or other Chinese brand then the screen itself is probably also not good quality.

Many low cost manufacturers use low cost chips as standard so they can offer attractive prices. We have a saying. If it is low cost, there must be a reason.

Tony Hui • It comes down to which LED and manufacturer you should use:

Nischia LED can last up to 10 yrs, I have expereinced in Hong Kong, but through years of maintenance( manufacurer was from Taiwan) the screen was barely acceptable in the last stage. The LED at Time Square in HK is by Sony, after so many years the quality is acceptable. I heard they were burning 5 % modules at the same time and Sony has special device for adjusting brightness before installation. (Sony does not produce LED Screen anymore).

Silan will achieve half brightness in less than 3 years, Cree and Taiwanese in 5 years and Nischia in 7-8 years. It also depends on the manufacturer as mentioned above.

You are also important, it is a one time business or a recurrent business, It is very very expensive to find the right supplier. Different supplier will supply different type of application.

Your client is also important so if it is a one time job. You should buy from a local agent who is not a trader. If you want to make money in LED, you need to invest a lot, unless U work with a specialist, because there are installation and operation support.

Tony HUI

 

Artha Doyle • Harry's points are right on the money.

Another way to look at it is by identifying the purpose of the display. For instance, advertising agencies wishing to sell space on the screens might opt for a screen that uses Epistar Red and Silan Green and Blue because it's a much cheaper alternative than using Cree or Nichia. Using this as an option can give an agency an ROI of a year or less (depending on the location and amount of clients). As long as it can perform for 3 years, they make a good profit and replace the screen with a new one whilst moving the old screen to a 2nd tier location or even selling it to a 3rd party.

If you are thinking of going down the cheaper alternative, make sure you buy from a reputable supplier and ask them for prices including a 3-year warranty. They'll charge you more for it but it might just be worth it when things start to go wrong in the 2nd or 3rd year.

Hope that was somewhat relevant :)

 

Marty Pisano • No doubt that Harry and Artha are giving you good advice. Let me add this.

LED diodes are becoming a mature technology. While Cree and Nichia have a long track record, the other factories are getting better every day as well.

My company (MediaNow) has built over 20 LED displays using diodes from all brands mentioned above. Our experience is that the diode is affected from many factors including: digitizers, sending and recieving cards, resyncers, scan cards, power supplies and wiring. Therefore, to get the best performance from any LED diode, make sure your sytem is properly configured and powered.

The one key item for getting long life from the diodes is to design the best artwork that stays away from too much white and bright (lumen) colors. White (as a color or background) demands the most power pass-through and will take more from the life of the diode than time will. Also, avoid running the LED signs and displays 24/7. There are 8700 hours in a year. Every day you reduce hours of operation will to the lifetime of any LED chipset.. We keep the signs ON and take the color to black overnight to extend the life of the diodes and power consumption for our Clients.

 

Common knowledge about LED display

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the comparison between Nichia, Cree, Silan, Epistar LED display

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The LED display scanning mode of calculation method and difference

About flexible LED curtain display

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This article is collected and edited by Fisher Dakota

 

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