|Samsung Display promotes dualization of QD inkjet equipment|
Samsung Display is preparing alternatives to overcome the difficulties of the quantum dot (QD) business. It plans to improve yield (percentage of good products) and quality by adding key equipment partners.
According to the industry on the 18th, Samsung Display is reviewing the dualization of QD inkjet equipment.
The QD-Organic Light Emitting Diode (OLED) that Samsung Display will mass-produce in the second half is divided into three layers. ? Thin-film transistor (TFT) that controls the light-emitting source ? Blue OLED light-emitting source ? QD light-emitting layer, etc. Inkjet printing process is applied to the double QD light emitting layer.
Inkjet printing is a technology that applies ink using an inkjet head (nozzle). Simply put, it means that the material is sprayed at the desired location. Samsung Display deposits a blue material and then coats the light emitting layer with red and green colors using an inkjet method.
Compared to the vapor deposition method that applies heat, it has advantages such as a simple process and less material loss. The problem is that high technical skills are required. Ink conversion of organic materials and implementation of related equipment software (SW) are not easy.
An official from the display industry said, "When you use a ballpoint pen, ink agglomeration called 'ballpoint pen shit' occurs. The same is true for the inkjet process. The key is to precisely spray the ink and control the speed by controlling the viscosity,” he said.
In the Samsung Display QD-OLED production line, Samsung affiliate SEMES used inkjet equipment. After competing with Katiba in the US, it succeeded in supplying all of it. Considering the poor management situation of Kativa at the time and the internalization aspect, Semes was selected.
However, it is said that some inkjet process issues occurred in the process of preparing for mass production of QD-OLED. As a result, LET, which is collaborating with Kativa, which has succeeded in developing inkjet, has emerged as an alternative. The industry expects that LET will provide the first inkjet equipment to Samsung Display in the second half of the year. It is rumored that Semes is also continuing to update.
Another official said, "SEMES will have sufficient mechanical know-how, such as supplying liquid crystal display (LCD)-related inkjet equipment, but I know that it does not meet the level that Samsung Display wants in SW technology and tact." Samsung Display is in the process of improving it in many ways,” he explained.