Hi friend, 
How are you ?
This is Viki from BIZBEE we are the cellphone spare parts supplier in Shenzhen China since 2009.
Today would like to share you information about the Samsung LCD screen:
In there market there 4 qualities for Samsung LCD screen
(1) Service pack: Which from Samsung Authorized distributor. full original and new quality. 
Packing : Screen + Anti-static bag  box with " Service pack"
Note: 60%  service pack Samsung screen from Germany. Very less qty in Chinese market. some company will buy "service pack" package but the screen quality might be refurbished original or others.
(2) Refurbished original:  That's the most selling quality for Samsung Series and Note Series.  different with full original one its on the glass was changed. 
For Refurbish original have A/B/C Grade
A grade: without any defect.   
B grade : ageing in screen top and bottom. Which very hard to see it. and no functional problem
C grade: Little shadow in the screen middle side. like keyboard and icon. 
(3) Chinese Copy OLED.  half price of refurbished original. 
Which mainly on J series and A series. was made from OLED factory .
The original and oled quality are basically the same in appearance. The only difference is the subtle size of the inner screen, which is basically within 0.1-0.3 inches. 
If you do not compare it at the same time, it is basically unrecognizable.
(4) TFT LCD . Cheapest choice , mainly for A series and J series. especially for old model , people don't wanna cost too much on the screen repairing. 
The main difference between the original LCD and TFT lcd is in the thickness. TFT LCD with back light while Original screen its OLED which without back light. 
If you are repair shop, the best quality we recommend for Samsung would be Refurbished original  working like full original but price will be cheap a lot. 
Bulk selling for refurbished original Samsung LCD screen:
Any interesting in our products or services, just feel free to contact us.


Kind regards

Viki Lin 
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BIZBEE TRADING LIMITED
Web:  www.bizbee.com
Mobile/ WhatsApp: +(86) 13650082137
Skype: viki.lin@bizbee.com
E-mail: viki.lin@bizbee.com
Add: Xinghe World, Wuhe Blvd South, Longgang District, Shenzhen, China