Comparison of OLED panel evaporation technology and printing display technology

- Apr 12, 2020-

As we all know, OLED has the advantages of self-illumination, flexibility, light and so on. Recently, it has been rapidly applied in the field of small and medium-sized size. In the field of large size, the popularization speed is far less than the application of small and medium-sized size due to the high manufacturing cost and the insignificant advantages of self-illumination.At present, the OLED panel production process mainly has the evaporation technology and the printing display technology.In both cases, electroless plating involves bombarding an electric current in a vacuum with an electron beam, heating it up with a laser, etc., to vaporize the vaporized material into atoms or molecules, and then making them move in a straight line, colliding with the surface of the substrate and forming a film.

At the heart of the technology that makes OLED panels is the transpiration machine, which is upstream from the panel maker, whose main supplier is Canon Tokki.As the global OLED market surges, Tokki continues to invest in developing capacity, but it is still struggling to meet the needs of its customers.

Comparison of OLED panel evaporation technology and printing display technology

OLED panel evaporation technology has been a problem, plus the evaporation machine technology has been controlled by Japanese and Korean enterprises, the number of evaporation machine production is very small, about a year to have more than 10 evaporation machine to sell, which is difficult to meet the future expansion of the OLED industry.So the popularity of the evaporation machine technology is not too realistic.

Each pixel on the OLED screen can be either steamed or printed.An inkjet printer, for example, sprays ink onto paper to form a manuscript or pattern.The printed display is an organic material film that USES the printing method to make the display.After printing and displaying, different panels can be printed. If the "spray" is OLED material, it is OLED panel.The "spray" is the quantum dot material, which is the quantum dot display panel.Simply speaking, OLED printing and display technology is to precisely deposit the solutions of different colors of polymer luminescent materials in the isolation column slot of ITO glass substrate through multiple nozzles of ink-jet printing equipment. After solvent volatilization, a thin layer of about 100 nm thickness will be formed to form luminescent pixels.

The printing and display technology is simpler, and the material utilization rate is more efficient, which can effectively reduce the production cost and shorten the production cycle, and has more advantages in the application and popularization of large-size OLED products.However, the current printing technology is not mature.

Hybrid process is the main mode of material application.At present, the progress of OLED blue light materials lags behind that of red and green materials.In order to solve the performance problems of blue light materials, Japanese and Korean manufacturers have developed hybrid technology, that is, the evaporation and printing process to mix, red and green luminous materials by the printing process, blue luminous materials still use the evaporation process.

This hybrid mode can solve the bottleneck problem of OLED panel production to some extent, and the future printing mode may have a great prospect in OLED industry.