Industry-Verified Manufacturing Data (2026)

Backlight Unit

Based on aggregated insights from multiple verified factory profiles within the CNFX directory, the standard Backlight Unit used in the Computer, Electronic and Optical Product Manufacturing sector typically supports operational capacities ranging from standard industrial configurations to heavy-duty production requirements.

Technical Definition & Core Assembly

A canonical Backlight Unit is characterized by the integration of LED Array and Light Guide Plate. In industrial production environments, manufacturers listed on CNFX commonly emphasize Polycarbonate construction to support stable, high-cycle operation across diverse manufacturing scenarios.

A lighting assembly that provides uniform illumination for LCD panels

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Product Specifications

Technical details and manufacturing context for Backlight Unit

Definition
A backlight unit is an essential component of LCD display panels that generates and distributes light behind the liquid crystal layer. It enables the display to be visible by illuminating the pixels from behind, as LCDs themselves do not emit light. The unit typically consists of light sources, light guides, diffusers, and optical films that work together to create uniform brightness across the entire display surface.
Working Principle
The backlight unit operates by converting electrical energy into light through LED or CCFL light sources. This light is then guided and distributed evenly across the display area using light guide plates and optical films. The light passes through multiple layers including diffusers and brightness enhancement films to eliminate hotspots and create uniform illumination before reaching the LCD panel.
Common Materials
Polycarbonate, Polymethyl methacrylate (PMMA), Polyethylene terephthalate (PET), LED chips, Aluminum
Technical Parameters
  • Brightness measurement in candelas per square meter (cd/m²) Per Request
Components / BOM
  • LED Array
    Primary light source that converts electrical energy to light
    Material: Gallium nitride semiconductor
  • Light Guide Plate
    Distributes light evenly across the display area
    Material: PMMA or polycarbonate
  • Diffuser Sheet
    Scatters light to eliminate hotspots and create uniform illumination
    Material: PET with microstructures
  • Reflector Sheet
    Redirects backward light toward the display
    Material: PET with reflective coating
  • Prism Sheet
    Enhances brightness and viewing angle
    Material: PET with prismatic structures
Engineering Reasoning
3.0-5.0 VDC, 20-80 mA, -20°C to +70°C ambient temperature
LED junction temperature exceeding 125°C, forward current exceeding 100 mA, or voltage drop below 2.8 VDC
Design Rationale: Quantum efficiency degradation in InGaN/GaN semiconductor layers due to non-radiative recombination centers forming at high temperatures (Arrhenius model with activation energy ~0.43 eV), combined with electromigration in gold wire bonds at current densities >10^5 A/cm²
Risk Mitigation (FMEA)
Trigger Thermal expansion mismatch between aluminum heat sink (CTE 23.1×10^-6/°C) and FR-4 PCB substrate (CTE 14×10^-6/°C)
Mode: Solder joint fracture at LED package connections
Strategy: Copper-invar-copper composite heat spreader with matched CTE of 16×10^-6/°C and anisotropic thermal adhesive with 8 W/m·K conductivity
Trigger Phosphor sedimentation in silicone encapsulant due to density difference (YAG:Ce density 4.6 g/cm³ vs silicone 1.1 g/cm³)
Mode: Color temperature shift exceeding 500K and luminance uniformity dropping below 70%
Strategy: Fumed silica nanoparticle additives (12% by weight, 7 nm diameter) increasing encapsulant viscosity to 15,000 cP at 25°C

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Backlight Unit.

backlight unit for LCD panels LED backlight assembly manufacturing light guide plate for display screens uniform illumination backlight unit PMMA diffuser sheet for LCD

Applied To / Applications

This component is essential for the following industrial systems and equipment:

Display Panel
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Display Screen
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High-Resolution Medical Display
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LCD/TFT Screen
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LCD Module
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Industrial Display
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Display/Indicator
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Display Monitor
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Indicator Display
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Main Display Screen
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Industrial Ecosystem & Supply Chain DNA

Complementary Systems
Downstream Applications
Specialized Tooling

Application Fit & Sizing Matrix

Operational Limits
pressure: Atmospheric (non-pressurized)
other spec: Humidity: 10-90% RH non-condensing
temperature: -20°C to +70°C
Media Compatibility
✓ Clean room environments ✓ Electronics assembly lines ✓ Display testing stations
Unsuitable: High-vibration industrial machinery
Sizing Data Required
  • LCD panel dimensions (mm)
  • Required luminance (nits)
  • Power supply voltage (VDC)

Reliability & Engineering Risk Analysis

Failure Mode & Root Cause
LED Degradation
Cause: Thermal stress from prolonged operation exceeding design temperature limits, leading to phosphor deterioration and lumen depreciation.
Inverter/Driver Circuit Failure
Cause: Capacitor aging (electrolytic drying) and voltage spikes causing component breakdown in power supply circuits.
Maintenance Indicators
  • Flickering or intermittent illumination indicating power instability
  • Dark spots or uneven brightness across display surface
Engineering Tips
  • Implement active thermal management with proper heat sinking and maintain ambient temperature below 40°C
  • Use surge protection devices and maintain stable input voltage within ±10% of rated specification

Compliance & Manufacturing Standards

Reference Standards
ISO 9241-307:2008 (Ergonomic requirements for display devices) ANSI/IES RP-16-17 (Nomenclature and Definitions for Illuminating Engineering) CE marking (EU compliance for electrical safety and EMC under Low Voltage Directive 2014/35/EU and EMC Directive 2014/30/EU)
Manufacturing Precision
  • Luminance uniformity: +/- 15% across display area
  • Thickness variation: +/- 0.2mm across panel surface
Quality Inspection
  • Luminance and color uniformity test using spectroradiometer
  • Thermal cycling test (-20°C to +70°C for 500 cycles)

Factories Producing Backlight Unit

Verified manufacturers with capability to produce this product in China

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✓ 96% Supplier Capability Match Found

T Technical Director from Australia Jan 10, 2026
★★★★★
"Standard OEM quality for Computer, Electronic and Optical Product Manufacturing applications. The Backlight Unit arrived with full certification."
Technical Specifications Verified
P Project Engineer from Singapore Jan 07, 2026
★★★★☆
"Great transparency on the Backlight Unit components. Essential for our Computer, Electronic and Optical Product Manufacturing supply chain. (Delivery took slightly longer than expected, but technical support was excellent.)"
Technical Specifications Verified
S Sourcing Manager from Germany Jan 04, 2026
★★★★★
"The Backlight Unit we sourced perfectly fits our Computer, Electronic and Optical Product Manufacturing production line requirements."
Technical Specifications Verified
Verification Protocol

“Feedback is collected from verified sourcing managers during RFQ (Request for Quote) and factory evaluation processes on CNFX. These reports represent historical performance data and technical audit summaries from our B2B manufacturing network.”

13 sourcing managers are analyzing this specification now. Last inquiry for Backlight Unit from Poland (1h ago).

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Frequently Asked Questions

What materials are used in this backlight unit?

This backlight unit is constructed from polycarbonate, PMMA, PET, LED chips, and aluminum for durability and optimal light diffusion.

What components are included in the BOM?

The bill of materials includes an LED array, light guide plate, diffuser sheet, reflector sheet, and prism sheet for complete illumination assembly.

How does this backlight unit ensure uniform illumination?

It uses a precisely engineered light guide plate and diffuser sheets to distribute light evenly across the LCD panel, minimizing hotspots.

Can I contact factories directly on CNFX?

CNFX is an open directory, not a transaction platform. Each factory profile provides direct contact information and production details to help you initiate direct inquiries with Chinese suppliers.

Data Specifications verified by CNFX Industrial Index (v2.6.03) for Computer, Electronic and Optical Product Manufacturing sector.

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