Microneedle point piezoelectric inkjet technology solution applied to OLED

Among the new generation of display technologies, the most eye-catching is the O LED technology. At present, many large factories have invested in research and development and made many breakthroughs. The industry has released the latest and improved "Micro Piezo inkjet technology" and applied it to large-size OLED TV processes to successfully solve the problem of uniform film formation that could not be overcome in the past. This major breakthrough represents the fact that in the near future, 1,080p OLED TVs above 37 inches will enter mass production.

The biggest advantages of the above OLED TVs are fast picture response time, high contrast, low power consumption, ultra-thin and wide viewing angle. However, there is still a major obstacle to the large-size OLED display required for mass production of TVs, that is, the lack of implementation. A technique for uniformly forming a film on a large-sized substrate in order to effectively eliminate the brightness difference that has been a headache in the large-area organic electroluminescence (EL) panel process.

At present, most of the O- LED products use vacuum thermal evaporation (VTE) in a vacuum chamber where the mask is placed close to the substrate and determines the type of material to be applied to the substrate. Since the method generates high temperature during the vapor deposition process, the mask may be displaced, which tends to cause uneven mold formation and low precision, thereby causing defects in uneven brightness.

Therefore, the industry began to look for alternatives, hoping to minimize the unevenness of brightness. The use of small inkjet printheads to directly coat OLED materials onto panels is considered an emerging solution. The method of manufacturing an OLED product by using inkjet technology generally has a plurality of nozzles arranged on the nozzle, but no matter how precise the inkjet printing head is manufactured, the ink amount of each nozzle will be slightly different, if not accurately Adjustment, in the process of film formation, will still cause uneven thickness of the luminescent layer, resulting in the occurrence of MURA (uneven brightness of the display caused by various traces). Even though this brightness unevenness has been reduced a lot, it can still be detected by the human eye, making the panel classified as a counterfeit or a secondary product.

In order to improve the above phenomenon, in the process of inkjet printing, it is necessary to more precisely control the amount of ink discharged and the drop point of the ink droplets. Epson proposed a solution to improve the micro-needle point piezoelectric inkjet technology originally used in general printers, accurately calculate the ink dose and the distribution of the drop point, and successfully improve the uniformity of OLED panel illumination.

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