What are the reasons for using a separate lamp driver in LED crystal film screens?
LED crystal film screens are a sub-category of LED transparent screens. Compared to LED transparent screens and film-coated screens, their structure is unique, extremely thin and light, with unparalleled transparency, and excellent flexibility and bendability. Crystal film screens utilize bare crystal ball implantation technology, using a transparent crystal film as the lamp board, etching a transparent mesh circuit on the surface, then attaching components, and finally completing the manufacturing process through vacuum sealing. This product combines flexibility, high transparency, and easy installation, making it an outstanding representative of the new generation of transparent screens. Its transparency reaches up to 95%, capable of presenting bright and vibrant image effects that are truly eye-catching.
LED crystal film screens break the standard framework concept of traditional transparent screens, offering superior flexibility and the ability to be rolled up arbitrarily. Its installation method is extremely simple; it can be directly pasted onto the inside of glass and can be cut to any size according to the glass dimensions, without damaging the original building structure or affecting indoor lighting. These characteristics allow LED crystal film screens to fully demonstrate their advantages and broaden their application scenarios.
The circuit board, as the core component of an LED crystal film screen, typically consists of a lamp board and a driver board. Currently, there are two design solutions on the market: integrated lamp and driver, and separate lamp and driver. The integrated lamp and driver design packages the LED and driver IC together, with the IC located on the front of the PCB board, eliminating the need for copper busbars and effectively avoiding screen flickering issues caused by inductance effects. The separate lamp and driver design, on the other hand, places the LED and driver IC on two separate PCB boards, connecting them via pin headers and female connectors to ensure normal operation.
Generally, the reasons for using a separate lamp and driver design are as follows: First, for displays using through-hole LEDs, the LED leads can interfere with the proper placement of the driver IC on the back, making a separate design more suitable. Second, for LED displays with small pixel pitch, the limited PCB trace area in electronic design allows for increased PCB trace space. Third, it addresses heat dissipation without affecting the LED display effect. If a combined lamp and driver approach is used, the driver IC generates significant heat when the LED density is high (i.e., the pixel pitch is small). This heat is transferred through the PCB to the LEDs directly opposite the driver IC, causing color changes. Separating the lamp and driver avoids this problem.
It's worth noting that indoor scanning screens, due to their smaller chip count, typically use more optical drivers to save costs, while outdoor LED displays tend to use separate optical drivers to extend screen performance and lifespan.
Currently, many LED film screen manufacturers are shifting from combined lamp and driver approaches to separate approaches. Numerous companies have applied this technology to film screens, effectively reducing screen temperature while increasing redundancy in screen control, thus enabling the integration of intelligent technologies.
