China 3.5 inch lcd display module st7789 Manufacturers, Suppliers, Factory

Standard RGB interface, 40PIN, support 16/18 bits, ST7102 driver IC, I2C interface

In the specifications of small and medium-sized color LCD screens, you often see "always white" and "always black" display modes. What do these specifically mean? Engineers from Shenzhen Hongjia Technology explain here. Always white and always black are two basic operating modes of an LCD monitor

In short, for small-sized LCD screens, QSPI is a better choice: through pin multiplexing and queue mechanism, while maintaining sufficient transmission rate, PCB design and master control resource usage are greatly simplified, which is especially suitable for scenarios that require dynamic display and limited space. SPI is only applicable to extreme cases where the driver IC does not support QSPI or has extremely simple functions. When actually selecting, it is necessary to first confirm the interface specifications of the screen driver IC (some screens support both SPI and QSPI, which can be switched by configuring pins).

In today's consumer electronics industry, both technologies are widely used, often appearing in the same device. For example, in an ultra-thin laptop, the main connection between the motherboard and screen might use direct gold-finger connectors for the sake of thinness, while the connections between the motherboard and components like the touchpad and keyboard might use traditional connectors. If reliability and maintainability are more important than saving a fraction of a millimeter in thickness, then connectors are a more reliable and mature choice. If you are building an ultra-thin, cost-sensitive new product with a high-precision automated production line, you should carefully consider the direct gold-finger connector solution.

At present, our company has 3 fully automatic FOG production lines and 3 fully automatic backlight assembly lines, with a monthly production capacity of 800K. Shenzhen Hongjia Technology has 12 years of industry experience, specializing in R&D, production and sales of 1.14-inch to 15-inch display screens and matching touch screens. Customers are welcome to email for consultation.

In short, the 1.9-inch bar-shaped screen is a triumph of functionalism and scenario-based design. It proves that good design isn't necessarily about a larger screen, but about using the right screen in the right place to solve the right problem. It has shifted from being the "center of content display" to becoming a "partner in providing information." This change in role is precisely the fundamental reason for its "great usefulness," making it an indispensable "screw" in the modern hardware ecosystem – small, but crucial.