PCBA Tech - The difference between SMT patch glue and LED and LCD

Skills for evaluating the performance indicators of SMT patch adhesives

At present, the widespread use of SMT patch technology enables related companies to effectively improve the processing efficiency and processing quality of their products. Among them, the patch glue plays a very important role. In this article, the performance indicators and evaluation of SMT patch adhesives. Viscosity Viscosity is the degree to which a fluid resists flow. It is a quantitative change in the ability of fluid molecules to absorb each other and hinder the relative movement of the molecules, that is, the internal resistance of fluid flow. Viscosity is an important indicator of patch adhesives, and different viscosities are suitable for different coating processes. There are two factors that affect the viscosity of the patch adhesive: one is the temperature, the higher the temperature, the lower the viscosity of the patch; the second is the pressure, the greater the pressure, the higher the shear rate of the patch, and the lower the viscosity. Yield strength The ability of the patch adhesive to resist external damage before curing is called the yield strength, which is characterized by the yield value. When the external force is less than the yield strength, the patch adhesive still maintains a solid state; when the external force is greater than the yield strength.

The difference between SMT LED and LCD

"Introducing the difference between LCD and LED" will give you an in-depth explanation of the difference between LCD and LED. I hope that through a deeper understanding of them, you will have no doubts when buying. Brightness, the response speed of individual elements of the LED display is The brightness of the LCD screen is 1000 times that of the LCD screen, and its brightness is more advantageous than that of the LCD screen. The LED display can also be illuminated under strong light, and it can adapt to the low temperature of minus 40 degrees. The refresh rate, LED uses electric energy to convert For light energy, it uses the injection principle, so its refresh rate is higher, and then it is better in terms of screen processing. The viewing angle, the angle of the LCD display is very limited, which is a very lively and headache problem, as long as it deviates If the angle is larger, the original color cannot be seen, or even nothing; while the LED can provide a viewing angle of up to 160 degrees, which has great advantages. Power consumption. Power consumption is the point that people are most concerned about.

Compared with LCD, the power consumption of LED has a ratio of about 1. In this respect, LED has a great advantage. The contrast ratio of the currently known relatively high-contrast LCD display is 1, but in many cases, it cannot meet various needs, but the LED display can reach higher and be more widely used. The service life of the LED display is generally about 100,000 hours. Under normal circumstances, it can be used for decades, while the LCD is much less. Appearance, LED is based on SMD light-emitting diodes. Compared with LCD, its display can be made thinner. The scope of application, the scope of application of the LED display is wider than that of the LCD display. It can display a variety of text, numbers, color images and animation information, and it can also play color video signals such as TV, video, VCD, DVD, and more importantly. Use multiple display screens for network broadcast. Color, LED screens are more realistic than LCD screens.

The above is the introduction to SMT LCD and LED