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GL Vision Develops QD Film for LED Backlights w/o a Barrier Film
September 25, 2017
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GL Vision has developed QDEF (Quantum Dot Enhancement Film) technology that makes QD (Quantum Dot) TV less expensive and thinner. This technology is resistant against heat, water, and air contact and does not require a barrier film to protect QD material. This company also mass-produced QD lighting with better color rendering by attaching QDEF to current LED lighting since it is resistant against heat. GL Vision developed stable QD material that is nearly not affected by heat, water, and oxygen and applied it to QD lighting. It is currently developing QDEF that has higher color representation power by attaching QD material to current LCDs. GL Vision developed QD powder and manufactured QD film and QD pellets for lighting by using this QD powder. Either attaching QD film can make QD lighting to the LEDs themselves or by putting a QD pellet into LED modules. “While generally color rendering of LED lighting is between 79 and 80Ra, LED lighting with QD pellets increases color rendering up to 95Ra.” said Technical Director Yoo Wang-geon of GL Vision. “Due to QD pellets resistant against heat, it can be used for lighting and it can prevent glare and reduces degree of fatigue of eyes.” GL Vision is discussing with South Korean and foreign companies supplying QD powder and pellets.” 
 
Figure 9: QD Pellet Production
Source: GL Vision
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Because its QD material is resistant to heat, air, and water, QDEF can be made without using a barrier film. GL Vision is currently developing QDEF for heat-resisting displays that do not require barrier films. Barrier film protects QDs from oxygen and water contact by breaking up quantum dots into resin and making it into a sheet and covering it with two barrier films. However barrier films are complex and expensive, responsible for about 20 to 30% of the QDEF price and thickness. Barrier film is about $30/sq. m.  GL Vision believes that the QDEF film will be 100 ums thick without the barrier film compared to 300ums with the barrier.
 

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