Display technology is widely used in electronic products such as smartphones, tablets, and TVs. In recent years, the scale of China's display panel industry has shown an overall growth trend. Data indicates that the market size of China's display panels reached approximately 569.4 billion yuan in 2023, a year-on-year increase of 19.77%. In recent years, leading brands have continuously iterated and innovated their technologies, transitioning from LCD to Micro LED with more challenging processes to maintain leadership in quality and performance.

As a technology enterprise dedicated to precision dispensing solutions and localized services, Quark Research Institute continuously delivers micro-scale, intelligent, and scenario-specific technologies for dispensing, sealing, coating, bonding, and encapsulation. Through these high-precision, quantitative fluid control technologies, we contribute to increasing the domestic substitution rate of display panel manufacturing equipment.

Silicone Adhesive Dispensing Process
As a vital component, rapidly evolving display technology empowers more application scenarios with vigorous vitality. The precise connection of display assembly parts achieved by non-contact fluid control is indispensable, with micro-dispensing being a key technology within it. As display products trend towards thinner and lighter designs, components become more miniaturized and integrated, and assembly methods become less visible. Furthermore, the waterproof, dustproof, shock, and drop resistance of displays are continuously improving, highlighting the importance of high-precision dispensing processes.

Among these, the silicone adhesive dispensing process specifically involves drawing precise lines of silicone adhesive on flat-panel screens. Silicone adhesive possesses excellent properties such as insulation, water resistance, and aging resistance, making it widely used in solutions for PCB and electronic component insulation protection, narrow bezel bonding, EMI shielding bonding, housing waterproof bonding, PCB conformal coating and device waterproofing, module potting protection, and thermal interface materials.

During display module production, silicone adhesive dispensing serves as a screen protection process. The quality of dispensing directly affects the module's stability and service life. This process fills gaps between components; after curing, it achieves excellent bonding and sealing effects. Simultaneously, it offers superior benefits like dustproofing, moisture resistance, vibration damping, and insulation. It not only protects the components of the display panel but also prevents the intrusion of external substances.

Precision Dispensing Safeguards Production
For the silicone adhesive dispensing process on screens, customers initially used screw valves. As a contact-based method, this approach frequently suffered from adhesive stringing and inconsistent dot sizes (tapering). Moreover, since this silicone adhesive is a moisture-curing type, it easily caused nozzle clogging during continuous dispensing or after prolonged downtime, leading to dispensing deviation, breaks, or even adhesive sticking inside the screw valve, rendering it inoperable.

Furthermore, as display panels become increasingly thinner, precision requirements for silicone adhesive processes have heightened. The piezoelectric jet valve, with its current-based fluid control method, offers advantages of speed, precision, and sustained operation, leading customers to adopt it. They conducted multiple rounds of testing on various performance aspects including speed, accuracy, stability, and dispensing results.

Quark Research Institute's meticulous one-stop technical R&D and production services, along with superior solution design capabilities, passed stringent tests, earning customer preference and trust. The customer chose to implement high-precision piezoelectric jet valves to complete the silicone adhesive panel dispensing process.

The high-precision piezoelectric jet valve utilizes advanced piezoelectric ceramic actuation technology. It achieves a dispensing accuracy of ±1% and a minimum single-dot volume of 0.1 nl. It excels at dispensing straight lines, arcs, and complex patterns with minimal defects like splatter or irregularly shaped dots.

Silicone Adhesive Process Requirements:

• Standard screen silicone line width requirement: 1.3 ±0.1 mm, with adhesive thickness below the glass surface level.

• Drawn adhesive lines must be free from breaks, insufficient adhesive, or splatter.

• Line width must be uniform, without tapering (varying thickness).

• Scheduled purging and nozzle wiping to prevent adhesive curing at the nozzle tip, which causes stringing.