Bright RGB Backlight

1. Raw Material Preparation and Pre-treatment: Selecting RGB LED chips suitable for high brightness requirements (preferably SMD and COB packages) ensures that chip luminous efficacy and wavelength consistency meet design standards. Simultaneously, preparing core raw materials such as PCB substrates, diffusion films, brightness enhancement films, reflective sheets, and driver ICs; ultrasonically cleaning or plasma treatment of the PCB substrate to remove surface oxides and oil; applying a thermally conductive layer to optimize heat dissipation; laser cutting and antistatic coating treatment of the optical films; and pre-drilling positioning holes to ensure subsequent assembly accuracy.

2. RGB LED Chip Mounting and Curing: A high-precision pick-and-place machine precisely mounts the RGB LED chips onto the PCB substrate according to preset coordinates, controlling the positional deviation within ±0.05mm. After mounting, a high thermal conductivity adhesive is applied, and the chips are fixed using thermosetting or UV curing processes to prevent excessive thermal resistance from causing light decay. Subsequently, an automated optical inspection (AOI) system is used to screen for defects such as mounting misalignment and tilting, ensuring mounting quality.

3. Circuit Connection and Protection: Gold wire bonding technology is used to connect the LED electrodes to the PCB substrate circuitry, ensuring that the bond wire arc height and pull force meet reliability standards. Flexible printed circuit boards (FPCs) are soldered to the driver circuit board, and circuit impedance is measured using a four-wire testing method to check for short circuits, open circuits, and other anomalies. Finally, conformal coating is applied to protect circuit nodes and improve product stability in harsh environments. Simultaneously, heat sinks are installed, and high thermal conductivity silicone grease is applied to optimize the heat dissipation path.

4. Optical System Integration: The pre-treated diffusion film, brightness enhancement film, and reflective sheet are stacked and assembled according to specifications. The diffusion film is parallel to the surface of the light guide plate, and the upper and lower prism films are placed at a 90° angle. The reflective sheet uses a PET substrate with a reflectivity ≥98% to ensure uniform light scattering, efficient focusing, and reduced light energy loss. During assembly, the spacing between each film is strictly controlled to avoid moiré interference, and edge sealing is performed to prevent light leakage.

5. Module Assembly and Packaging: The mounted LED substrate, optical components, and metal/plastic frame are precisely assembled using high-precision fixtures to ensure that the positional tolerance of each component is controlled within ±0.1mm. Appropriate fixing processes (ultrasonic welding, epoxy resin bonding, etc.) are selected, and a heat dissipation structure is integrated inside the shell, with graphene heat sinks or designed fins, controlling the operating temperature below 50℃. Finally, the shell is encapsulated, with a pre-installed silicone sealing ring to ensure airtightness, achieving an IP65 or higher protection rating.

6. Testing, Calibration, and Quality Control: In a darkroom environment, products are tested using professional luminance meters and spectrophotometers to detect parameters such as peak brightness, color uniformity, and color coordinate consistency. The drive current is fine-tuned through a zone dimming algorithm to ensure that the overall brightness difference is controlled within ±5% and the color difference Δu'v' is less than 0.003. At the same time, the stability, power consumption, and overvoltage and overcurrent protection performance of the drive circuit are tested, and appearance defects and assembly problems are investigated. Qualified products are packaged with anti-static and moisture-proof materials, and unqualified products are reworked to ensure that the products leaving the factory meet the standards.