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Edge-Lit LED Backlight PCB Assembly--STHL.png

Edge-Lit LED Backlight PCB Assembly--STHL

Edge-Lit LED Backlight PCB is a specialized circuit board designed for edge-lit LED backlight systems, with LED chips arranged along the edges of the PCB, guiding light through a light guide plate to form uniform backlight. It is engineered to be thin and lightweight, ideal for slim displays such as laptops, monitors, and small-size TVs. As the core component of edge-lit backlights, it features low power consumption, compact design, and uniform light emission, supporting dimming and color temperature adjustment. Our 10,000-square-meter production base and 2 DIP lines ensure each PCB meets the slim design requirements of modern displays, with strict quality testing to ensure stable performance.

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    Edge-Lit LED Backlight PCB Assembly--STHL

    Early challenges in Edge-Lit LED Backlight adoption—such as uneven light guide distribution, electromagnetic interference (EMI), and limited slimness for ultra-thin displays—have been overcome by specialized PCB assembly technologies, particularly rigid-flex PCBs, flexible PCBs (FPC), and high-precision surface mount technology (SMT). These innovations effectively enhance the stability of LED drive circuits for uniform edge-to-center lighting, while integrating EMI shielding layers to eliminate interference from external TV/display components (such as mainboards, power supplies, and control modules) and surrounding electronic devices. Rigid-flex and flexible PCBs, in particular, balance slim form factors with reliable signal transmission and efficient heat dissipation, supporting the side-mounted layout and ultra-thin design of edge-lit displays without compromising backlight performance. This technological leap has enabled Edge-Lit LED Backlight PCB Assemblies to outperform traditional edge-lit backlight circuits in key areas:

    • Superior Signal Integrity

      Advanced impedance-controlled routing and ultra-low-noise PCB substrates (FPC, FR-4 flexible composites) minimize signal attenuation during the transmission of LED drive and dimming signals along the side-mounted PCB strips. Equipped with high-resolution (≥16-bit) ADC integration, they ensure the accuracy of brightness control and color gamut reproduction, laying the foundation for uniform light distribution from edge to center of the display panel and consistent illumination across the entire screen. This eliminates signal crosstalk between LED chips on the side strips, ensures stable light output matching the light guide plate’s optical characteristics, and meets the strict optical performance requirements for high-definition (4K/8K) displays, as well as LM-79 photometry standards for light measurement.

    • Versatile Form Factor Adaptability

      Compliant with IEC 60598 lighting safety standards and IEC 62471 photobiological safety standards, the assemblies adopt reinforced isolation designs (such as double-layer insulation, anti-short circuit protection, and surge protection) to prevent electrical leakage risks and ensure blue light radiation is below RG 0, the safest level defined by IEC 62471. High-quality flexible and rigid-flex substrates are used to adapt to diverse edge-lit backlight types—including single-side, double-side, and four-side edge-lit designs—and various display sizes (from 24-inch to 85-inch), supporting ultra-thin (≤10mm) and frameless display designs and seamless integration with TV, monitor, and laptop panels. The conformal coating materials also meet fire-retardant and insulation requirements, ensuring safety for long-term operation and compatibility with different display structural designs, while adhering to relevant industry performance standards.

    • Reliable Long-Term Operation

      ENIG (Electroless Nickel Immersion Gold) surface finishes and waterproof conformal coatings (IP65 rating, adapted to display internal environments) provide excellent corrosion resistance and moisture protection, essential for PCB assemblies installed in the narrow edge of display enclosures. Combined with rigorous temperature (-20°C to +70°C) and vibration testing, as well as enhanced thermal management through optimized heat dissipation pathways and heat-conducting tapes, the assemblies maintain stable performance during long-term continuous operation (up to 50,000 hours). They comply with long-term stability and accelerated aging test requirements (LM-80 and TM-21 projections), minimize light decay, and avoid local overheating by evenly distributing thermal load along the side strips, ensuring consistent backlight brightness and color accuracy throughout the display’s service life.

    Key Applications Across Edge-Lit LED Backlight Sectors

    Edge-Lit LED Backlight PCB technology powers high-performance, ultra-slim, and uniform backlighting solutions for diverse display types, supporting high-definition display and enhanced viewing experience while ensuring compliance with international safety and performance standards and long-term reliability.

    Consumer Home TVs & Laptops

    High-precision Edge-Lit LED Backlight PCB modules, featuring uniform edge-to-center lighting and precise dimming control, integrated with TV and laptop mainboards for seamless operation. These are widely used in ultra-thin 4K/8K smart TVs, slim LCD TVs, and laptop displays, providing vivid color reproduction and uniform screen illumination to enhance home viewing and office use experience, while ensuring safe blue light emission and meeting photometric performance standards.

    Professional Monitors & Tablets

    In professional scenarios such as office workstations, design studios, and medical auxiliary monitors, the PCB assemblies power high-end edge-lit monitors and tablets that require accurate color reproduction and uniform backlighting. The stable signal transmission and precise dimming control of the side-mounted strips meet the strict professional requirements for color accuracy and image clarity, while adhering to photobiological safety norms and photometric standards.

    Commercial Display Screens

    Rugged Edge-Lit LED Backlight PCB assemblies, built with anti-interference circuits and durable flexible substrates, ensure stable performance in commercial display screens used in shopping malls, hotels, and office lobbies. They support 24/7 continuous operation, maintain consistent backlight performance for digital signage, advertising displays, and public information screens, and comply with commercial safety and performance standards, including low ripple and flicker-free dimming requirements.

    Small-Size Displays & Smart Devices

    Custom Edge-Lit LED Backlight PCB modules, leveraging flexible design and compact side-mounted layout, provide reliable technical support for small-size displays (24-inch to 55-inch), smart monitors, and digital photo frames. They support ultra-slim design and uniform backlighting, adapt to limited installation space, and meet the needs of home office, small commercial venues, and smart device display scenarios, while complying with relevant safety and performance certifications.

    Why STHL PCBA should be your top choice for your LED PCBA needs?

    Let's explore the top 10 reasons why!

    Real Factory

    STHL PCBA is a real factory with 10,000+m² highly automated, dust-free factory，7 SMT lines, 2 DIP lines, 2 FCT lines, and 2 box building assembly lines. 

    Quality Guarantee

    We buy components from famous international platform like Mouser, Digikey, Farnell, Future, Avnet, Arrow or the agents. No components substitutes without customers approval!

    Rich Experience

    20+ years of experience in PCB & PCBA field.

    Cost Dowm

    Professional engineering team supports cost down.

    Global Sourcing

    500k parts with 100+ agents and suppliers.

    No MOQ

    No minimum order requests, we accept both prototype and volume quantity orders.

    Fully Certified

    With IATF16949, ISO9001, ISO14001, ISO13485 Certifications.

    NDA

    We ensure all of your projects documents security and sign NDA before RFQ.

    Intelligent Management

    Use Intelligent ERP system, MES (manufacturing execution system) for fast tracking.

    Fast Delivery

    Prototype orders will be fast completed and delivered, mass orders lead time is 4~5 weeks.

    About STHL PCB & PCBA

    LED PCB Assembly Revolutionizing Lighting Technology with Precision and Per (1)

    Shenzhen STHL Technology Co., Ltd. is a high-quality provider of electronics manufacturing services (EMS) in China, we serve customers worldwide along the whole industry chain including product design, material sourcing, PCBA production, cable assembly, box build assembly and comprehensive testing services.

    Established in 2006, we have more than 20 years of experience in electronics contract assembly manufacturing. Currently, we employ more than 220 staff members. Our 10,000 sqm facilities include 7 surface-mount technology (SMT) production lines, 2 through hole technology (THT) lines , 2 function testing lines and 2 box build production lines.

    At STHL, we provide electronics assembly services for energy power, communications, consumer electronics, computers & storage, safety & security, commercial and industrial products. Customers mainly from United States, Brazil, United Kingdom, Germany, Spain, Italy, Poland and . As an IATF16949，ISO9001, ISO14001, and ISO13485 certificated electronics assembly manufacturer, we produce products exactly comply with ROHS standard and quality guarantee. Based on our excellent engineering and production capacities in technical areas such as materials analysis & storage, advanced equipment, reliability testing (AOI, X-RAY, ICT test and function test), high effective SMT and THT assembly, we are recognized as a long-term reliable PCBA vendor by more and more customers wordlwide.

    Products Capability

    Items

    PCB capacity

    PCB name

    LED PCB Assembly: Revolutionizing Lighting Technology with Precision and Performance

    Material

    FR-4; High TG FR-4; Aluminum; CEM-1; CEM-3; Rogers, etc

    PCB type

    Rigid, flexible, rigid-flexible

    Layer NO.

    1, 2, 4, 6, up to 24 layer

    Shape

    Rectangular, round, slots, cutouts, complex, irregular

    Max PCB dimensions

    1200mm*600mm

    Board Thickness

    0.2mm-4mm

    Thickness Tolerance

    ±10%

    Min Hole Size

    0.1mm (4 mil)

    Copper Thickness

    0.5 OZ-3OZ (18 um-385 um)

    Copper Plating hole

    18um-30um

    Min Trace Width

    0.075mm (3mil)

    Min Space Width

    0.1mm (4 mil)

    Surface finish

    HASL, LF HASL, Imm Gold, Imm Silver, OSP etc

    Solder mask

    Green, red, white, yellow, blue, black, orange, purple

    Assembly details

    SMT and Thru-hole, ISO SMT and DIP lines

    Testing on products

    Testing jig/mold , X-ray Inspection, AOI Test, Functional test

    Quantity

    Min quantity : 1pcs. Prototype, small order, mass order, all OK

    Products Capability

    Files needed

    PCB : Gerber files(CAM, PCB, PCBDOC)

    Components : Bill of Materials(BOM list)

    Assembly : Pick-N-Place file

    PCB Panel Size

    Min size : 0.25*0.25 inches(6*6mm)

    Max size : 1200*600mm

    Components details

    Passive Down to 0201 size

    BGA and VFBGA

    Leadless Chip Carriers/CSP

    Double-sided SMT Assembly

    Fine BGA Pitch to 0.2mm(8mil)

    BGA Repair and Reball

    Part Removal and Replacement

    Component package

    Cut Tape, Tube, Reels, Loose Parts

    PCB+ assembly process

    Drilling---Exposure---Plating---Etaching & Stripping---Punching---Electrical Testing---SMT---Wave

    Soldering---Assembling---ICT---Function Testing---Temperature & Humidity

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    Digital Innovation

    APPhored (7)
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    Digital Innovation

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    Digital Innovation

    Material are (1)
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    Digital Innovation

    第24点图替换组合配图1
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    Digital Innovation

    DIP 1
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    Digital Innovation

    How to Get Started with STHL

    Ready to partner with us for your LED PCB Assembly project? Here’s how you can get started

    • Contact Us

      Contact Us

      Reach out to our sales team via phone, email, or online chat to discuss your project requirements.
    • Professional Expertise (2)

      Provide Design Files

      Send us your PCB design files (Gerber, BOM, etc.) for a detailed quote.
    • Cost-Effective Solutions

      Get a Quote

      We will provide you with a comprehensive quote, outlining all costs and timelines.
    • Delivery

      Production and Delivery

      Once the quote is approved, our team will begin production, ensuring your PCB assembly is completed on time and to the highest quality standards.

    Make an free consultant

    Whether you need PCB Fabrication or PCBA Assembly Service, STHL delivers innovation and reliability.

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    Remarks*

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