As the demand for cutting-edge display technologies escalates, the pursuit of efficient and reliable packaging methods for Organic Light Emitting Displays (OLEDs) intensifies. In this quest, the glass laser welding process emerges as a technological breakthrough that holds the potential to redefine OLED packaging. In this technical article, we delve into a comprehensive experiment that harnesses ultrafast lasers to perform glass laser welding for OLED packaging. This experimental endeavor not only showcases the prowess of femtosecond-level ultrafast lasers but also sheds light on the groundbreaking Han’s Laser glass ceramic fusion welding processing system, poised to transform the flat panel display industry.
Principle of welding
Experiment Parameters and Setup
The experiment centers on a meticulous process that demonstrates the capabilities of the glass laser welding Process. A 0.3mm thick glass plate, with a 20mm×20mm welding area. The employed 20W femtosecond laser is integrated into the independently developed Han’s Laser welding machine. This machine boasts a marble movement platform that ensures pinpoint accuracy, a pivotal factor in achieving flawless welds.
OLED display basic structure
The Sequential Steps
Pristine Surface Preparation: The experiment commences with a meticulous cleaning process. Employing an ultrasonic cleaning system, the glass surface undergoes thorough cleansing, followed by a sequence of alcohol and distilled water wipes. The surface is then meticulously dried, setting the stage for optimal welding conditions.
Glass Lamination: The glass sheets are securely positioned using a specialized fixture. Precise pressure adjustment ensures that the distance between the two substrate glasses remains below a quarter of the laser wavelength. This meticulous optical bonding guarantees the integrity of the ensuing weld.
Focus and Alignment: The marble motion platform comes into play as the Z-axis height is adjusted to achieve laser focus. The laser welding head’s alignment is carefully calibrated, ensuring its focal point resides at the glass frit between the two substrates, as predetermined by the laser working distance.
Laser Precision: With the apparatus meticulously prepared, the experiment proceeds to the laser welding phase. The software-driven process leverages adjustable process parameters, encompassing laser attributes, welding speed, trajectory, and more. This orchestrated symphony culminates in the precise welding of the glass along the predefined trajectory.
Weld Seam Morphology
Ultrafast Laser Advantages
Central to the experiment’s success is the utilization of femtosecond-level ultrafast lasers. These lasers, boasting pulse durations in the order of picoseconds and femtoseconds, exemplify high peak energy and minimal thermal effects. This combination empowers direct welding between glass components, eliminating the need for glass frit screen printing and intricate heat dissipation structures. The result is a fusion of glass that epitomizes uniformity, void of defects such as pores and stress deformations. Furthermore, the thermal impact is negligible, safeguarding the delicate components housed within the glass and adhering to stringent airtightness prerequisites essential for OLED packaging.
Han’s Laser Glass Ceramic Fusion Welding Processing System
The highlight of this journey is the Han’s Laser glass ceramic fusion welding processing system. Anchored by an ultra-fast laser (femtosecond/picosecond) and a high-precision motion control system, this innovation finds its footing in OLED screen packaging, precision welding, and glass-metal fusion. With precision, control, and minimal thermal impact, this system opens vistas of possibility within the domain of transparent and brittle material welding.
The glass laser welding process experiment presents a paradigm shift in OLED packaging, exemplifying the potency of ultrafast lasers and innovative welding methodologies. As the Han’s Laser glass ceramic fusion welding processing system heralds a new era of precision welding, the future of OLED packaging stands at the threshold of unprecedented reliability and efficiency. This endeavor not only contributes to the evolution of display technology but also signifies the continuous pursuit of excellence in precision engineering.