INDUSTRY COMPONENT

Light Guide Plate (LGP)

A transparent optical component that evenly distributes light from LED sources across the surface of LED panel lights.

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Component Specifications

Definition
A Light Guide Plate (LGP) is a precision-engineered optical component typically made from acrylic (PMMA) or polycarbonate, designed to transmit and uniformly diffuse light from edge-mounted LED sources across its entire surface area. It utilizes microstructures (dots, prisms, or V-grooves) on its surface or within its body to control light propagation through total internal reflection and controlled extraction, ensuring uniform luminance distribution in LED panel lighting applications.
Working Principle
Operates on the principle of total internal reflection (TIR). Light enters from LEDs positioned along the edges and travels through the plate. Micro-optical features (such as printed dots, laser-engraved patterns, or molded structures) disrupt TIR at calculated points, extracting light perpendicularly from the surface. The density and size of these features are graded to compensate for light attenuation, achieving uniform surface illumination.
Materials
Primary: Polymethyl methacrylate (PMMA, Acrylic) - preferred for high transmittance (~92%) and low cost. Alternative: Polycarbonate (PC) - used for higher heat resistance (up to ~120°C) and impact strength, but with slightly lower light transmission (~88-90%). Optical grade, UV-stabilized, with additives for flame retardancy (e.g., UL94 V-0 rating).
Technical Parameters
ParameterTypical rangeNotes & selection driver
Haze<1% (clear LGP) or customized for diffusing types
Thickness1.0-3.0 mm (typical)
Transmittance>90% (PMMA)
Surface PatternLaser engraved, printed dots, or injection-molded microstructures
Refractive Index~1.49 (PMMA), ~1.58 (PC)
Thermal StabilityUp to 80°C (PMMA), 120°C (PC)

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Standards
ISO 4892-2 (Plastics - Exposure to light sources), DIN 5036-3 (Radiometric and photometric properties of materials)

Parent Products

This component is used in the following industrial products

LED Panel Lights

Flat, surface-mounted lighting fixtures that use light-emitting diodes (LEDs) to produce uniform illumination across a panel surface.

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Engineering Analysis

Risks & Mitigation
  • Yellowing or degradation from prolonged UV/heat exposure
  • Surface scratching reducing optical performance
  • Warping due to thermal expansion if poorly designed
  • Non-uniform brightness from imprecise pattern design or manufacturing defects
FMEA Triads
Trigger: Incorrect pattern design or manufacturing tolerance errors
Failure: Non-uniform light output (bright spots or dark areas)
Mitigation: Implement rigorous optical simulation (e.g., LightTools, TracePro) before production and use precision laser engraving or injection molding with strict QC on pattern accuracy.
Trigger: Material degradation from high operating temperatures or UV exposure
Failure: Reduced light transmission, yellowing, or cracking
Mitigation: Use UV-stabilized, heat-resistant grades (e.g., PC for high-temp applications) and ensure adequate thermal management in the light fixture design.
Trigger: Mechanical stress during handling or assembly
Failure: Cracks or fractures, especially in thin LGPs
Mitigation: Design with appropriate thickness and edge supports, use protective films during handling, and train assembly personnel on proper handling procedures.

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance
Thickness tolerance: ±0.1 mm; Pattern position accuracy: ±0.05 mm; Surface flatness: <0.2 mm/m
Test Method
Light uniformity tested with integrating sphere and luminance meter per IES LM-79; Material properties tested per ASTM D1003 (transmittance/haze) and UL 746A (thermal aging).

Procurement Evaluation Criteria

A practical evidence checklist for RFQ preparation and supplier evaluation.

Technical documentation
Request current drawings, revision history, and a signed specification sheet.
Manufacturing capability
Verify equipment lists, process limits, capacity, and representative production evidence.
Inspection readiness
Confirm test methods, calibrated equipment, sampling plans, and traceable reports.
Supplier transparency
Check the legal entity, factory address, ownership, certifications, and direct contacts.

CNFX does not score or rank suppliers. Buyers must verify all claims and documents with the legal manufacturer before ordering.

Manufacturers of Light Guide Plate (LGP)

Manufacturer profiles associated with Light Guide Plate (LGP).

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Compiled and source-reviewed by the CNFX editorial team. Each manufacturer above links to the page on that company's own website where the product is listed, with the date we checked it. How we source and review

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Frequently Asked Questions

What is the main function of a Light Guide Plate in LED panels?

Its primary function is to uniformly distribute light from edge-mounted LEDs across the entire surface of the panel, eliminating hotspots and ensuring consistent brightness for comfortable illumination.

Why is PMMA commonly used for LGPs?

PMMA (acrylic) offers excellent optical clarity (high light transmittance), ease of precision machining or molding for microstructures, good UV stability, and cost-effectiveness compared to alternatives like polycarbonate.

How does the pattern on an LGP affect light output?

The pattern (dots, grooves, or prisms) controls light extraction by scattering light at specific points. A gradient pattern—denser near the LED sources and sparser farther away—compensates for light intensity loss, enabling uniform surface emission.

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records. See the editorial policy.

Preliminary Technical Classification
This page supports structured research, RFQ preparation, and supplier evaluation. It does not replace buyer-led supplier qualification, standards review, or technical approval.

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