Light Input Edge: Entry Angle Range 70°-90°

Component Specifications

Definition

The Light Input Edge is a critical optical interface component in Light Guide Plate (LGP) systems, engineered to receive light from sources such as LEDs or CCFLs and efficiently couple it into the LGP. It features precision-engineered surfaces, often with microstructures or coatings, to minimize reflection losses, control light entry angles, and initiate uniform lateral propagation within the plate. This component directly influences the overall brightness, uniformity, and energy efficiency of backlight units used in displays and lighting panels.

Working Principle

Operates on principles of total internal reflection (TIR) and controlled light coupling. Light enters through the edge at specific angles optimized by the edge geometry and surface treatments. The edge design ensures minimal Fresnel losses and directs light into the LGP core to propagate via TIR, where it is later extracted uniformly across the plate surface by microstructures.

Materials

Typically made from optical-grade polymers: Polycarbonate (PC) or Polymethyl Methacrylate (PMMA). Key specifications include high transparency (>90% transmittance), refractive index (1.49 for PMMA, 1.58 for PC), low haze (<1%), and UV stability. May include anti-reflective coatings or diffusion layers.

Technical Parameters

Parameter	Typical range	Notes & selection driver
Entry Angle Range	70°-90°
Surface Roughness	<0.1 μm Ra
Thickness Tolerance	±0.05 mm
Dimensional Accuracy	±0.1 mm
Operating Temperature	-20°C to 85°C
Light Coupling Efficiency	>85%

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 10110, ISO 13696, DIN 3140

Parent Products

This component is used in the following industrial products

Light Guide Plate

A transparent optical component that guides and distributes light from edge-mounted LEDs uniformly across the display surface.

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Engineering Analysis

Risks & Mitigation

Optical degradation from UV exposure
Mechanical damage during handling
Poor coupling efficiency due to manufacturing defects
Thermal expansion mismatches

FMEA Triads

Trigger: Surface contamination or scratches
Failure: Reduced light transmission and increased scattering
Mitigation: Implement cleanroom handling, apply protective coatings, and use automated inspection systems.

Trigger: Material thermal expansion
Failure: Dimensional changes leading to misalignment with light sources
Mitigation: Use materials with low coefficient of thermal expansion (CTE), design with tolerance gaps, and control operating temperature.

Trigger: Inadequate edge geometry
Failure: Poor light coupling and non-uniform distribution
Mitigation: Precision machining or molding, simulation-based design validation, and adherence to optical standards.

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance

Optical surface flatness within λ/4 at 632.8 nm, dimensional tolerances per ISO 2768-m

Test Method

Light coupling efficiency measured with integrating sphere per ISO 13696, surface quality inspected per ISO 10110-7, dimensional checks via coordinate measuring machine (CMM).

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 Input Edge

Manufacturer profiles associated with Light Input Edge.

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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 primary function of a Light Input Edge?

To efficiently couple light from external sources into the Light Guide Plate while minimizing losses and ensuring uniform initial light distribution.

How does material choice affect Light Input Edge performance?

Materials like PMMA and PC offer high clarity and specific refractive indices that optimize total internal reflection and light transmission, impacting brightness and efficiency.

What are common failure modes for Light Input Edges?

Scratches or contamination on the edge surface, material yellowing from UV exposure, and dimensional warping due to thermal stress.

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.

Light Input Edge