INDUSTRY COMPONENT

Light Guide Plate

A transparent optical component that uniformly distributes light from LEDs across an LCD panel's surface.

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Component Specifications

Definition
A precision-engineered, thin plate typically made from acrylic (PMMA) or polycarbonate, featuring microstructures (dots, prisms, or grooves) on its surface or edges. It guides and diffuses light from edge-mounted LEDs across its entire area through total internal reflection and controlled light extraction, ensuring uniform brightness and eliminating hotspots in LCD backlight units.
Working Principle
Operates on total internal reflection (TIR). Light from edge-mounted LEDs enters the plate and propagates through it via TIR. Micro-optical structures (e.g., printed dots, laser-engraved patterns, or molded features) on the bottom or surface scatter light out of the plate at controlled angles, uniformly illuminating the LCD panel above. The pattern density increases with distance from the light source to compensate for light attenuation.
Materials
Primary: Polymethyl methacrylate (PMMA, acrylic) - high transparency (92%+), good UV stability. Alternative: Polycarbonate (PC) - higher heat resistance but slightly lower clarity. Coatings: Diffusion layers, brightness enhancement films (BEF), or micro-lens arrays may be applied.
Technical Parameters
  • Haze <1% (clear plate)
  • Thickness 0.3-3.0 mm
  • Transmittance >90%
  • Light Uniformity >85%
  • Surface Roughness <0.1 μm (optical grade)
  • Thermal Stability -40°C to 85°C
Standards
ISO 13406-2, ISO 9241-307, DIN 58141, IEC 62341

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Light Guide Plate.

light guide plate LGP backlight unit LCD display optical diffusion PMMA LED backlight uniform illumination display technology Light Guide Plate in Computer, Electronic and Optical Product Manufacturing

Parent Products

This component is used in the following industrial products

Backlight Unit (for LCD)

A lighting assembly that provides illumination for LCD panels to make the display visible.

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Backlight Unit

A lighting assembly that provides uniform illumination for LCD panels

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Backlight Assembly

A component assembly that provides uniform illumination for LCD displays by generating and distributing light behind the screen.

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Engineering Analysis

Risks & Mitigation
  • Yellowing or haze from UV exposure
  • Thermal deformation near LEDs
  • Scratch sensitivity affecting light output
  • Moisture absorption in humid environments
  • Pattern degradation over time
FMEA Triads
Trigger: UV degradation of PMMA material
Failure: Reduced light transmittance, yellowing, uneven brightness
Mitigation: Use UV-stabilized PMMA, apply protective coatings, ensure proper heat dissipation from LEDs
Trigger: Inconsistent micro-pattern printing or molding
Failure: Non-uniform light distribution, visible bright/dark spots
Mitigation: Implement strict quality control (automated optical inspection), use precision laser engraving or injection molding with certified tooling
Trigger: Thermal expansion mismatch with adjacent components
Failure: Warping, optical misalignment, Newton's rings (interference patterns)
Mitigation: Design with thermal expansion coefficients in mind, use compliant mounting, maintain operating temperature within specified range

Industrial Ecosystem

Compatible With

Interchangeable Parts

Compliance & Inspection

Tolerance
Thickness: ±0.05 mm, Pattern alignment: ±0.02 mm, Flatness: <0.1 mm/m
Test Method
Light uniformity testing with integrating sphere or CCD camera, spectrophotometry for transmittance/haze, thermal cycling tests, accelerated UV aging per ISO 4892

Buyer Feedback

★★★★☆ 4.6 / 5.0 (37 reviews)

"The technical documentation for this Light Guide Plate is very thorough, especially regarding technical reliability."

"Reliable performance in harsh Computer, Electronic and Optical Product Manufacturing environments. No issues with the Light Guide Plate so far."

"Testing the Light Guide Plate now; the technical reliability results are within 1% of the laboratory datasheet."

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Frequently Asked Questions

What is the main function of a light guide plate?

To uniformly distribute light from edge-mounted LEDs across the entire surface of an LCD panel, eliminating bright spots and ensuring consistent brightness for display visibility.

Why is PMMA commonly used for light guide plates?

PMMA offers excellent optical clarity (over 92% light transmittance), good UV resistance, ease of precision molding, and cost-effectiveness, making it ideal for high-quality light diffusion.

How does a light guide plate achieve uniform light output?

Through micro-optical patterns (dots or grooves) on its surface that scatter light. The pattern density is carefully designed to increase with distance from the LED source, compensating for natural light attenuation to maintain uniformity.

Can I contact factories directly?

Yes, each factory profile provides direct contact information.

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