Reflective Sheet: Thickness 50-250 μm, Reflectivity >95%

Q: What is the primary function of a reflective sheet in an LCD backlight unit?

To maximize light efficiency by reflecting and redirecting light from the source toward the display panel, improving brightness and uniformity.

Q: What materials are commonly used for reflective sheets?

PET or PC with reflective coatings like silver or white pigments, chosen for high reflectivity and durability.

Q: How does a reflective sheet impact energy consumption in displays?

By enhancing light reflection, it reduces the need for higher-power light sources, leading to lower energy usage and improved efficiency.

Component Specifications

Definition

A reflective sheet is a critical optical component in LCD backlight units, designed to reflect and redirect light from the light source (e.g., LEDs) toward the display panel. It enhances brightness uniformity and efficiency by minimizing light loss, typically through a highly reflective surface made from materials like PET or PC with specialized coatings. This component is essential for achieving optimal luminance and energy efficiency in LCD displays.

Working Principle

The reflective sheet operates on the principle of specular and diffuse reflection. Light emitted from the backlight source strikes the sheet's surface, where it is reflected back toward the display panel. The sheet's microstructure or coating is engineered to maximize reflectivity (often >95%) and distribute light evenly, reducing hotspots and improving visual uniformity across the screen.

Materials

Typically made from polyethylene terephthalate (PET) or polycarbonate (PC) with a reflective coating (e.g., silver, white pigment, or multilayer optical films). Thickness ranges from 50 to 250 micrometers, with surface treatments for enhanced durability and optical properties.

Technical Parameters

Parameter	Typical range	Notes & selection driver
Thickness	50-250 μm
Reflectivity	>95%
Surface Roughness	<0.5 μm
Thermal Stability	-20°C to 85°C
Light Diffusion Angle	10-30 degrees

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 13468-2, ISO 4892-2, DIN 5036-3

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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Engineering Analysis

Risks & Mitigation

Delamination or peeling of reflective coating
Reduced reflectivity due to thermal degradation
Scratches or damage during handling affecting optical performance
Moisture absorption leading to dimensional instability

FMEA Triads

Trigger: Poor adhesion of reflective coating
Failure: Delamination reduces reflectivity and causes dark spots
Mitigation: Use advanced adhesion promoters and quality control during coating application

Trigger: Exposure to high temperatures
Failure: Thermal degradation lowers reflectivity and causes yellowing
Mitigation: Select materials with high thermal stability and implement cooling designs in the backlight unit

Trigger: Mechanical stress during assembly
Failure: Cracks or tears impair light distribution
Mitigation: Handle with protective packaging and automated assembly tools to minimize stress

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance

±5% for reflectivity and thickness, ±0.1 mm for dimensional accuracy

Test Method

ISO 13468-2 for optical properties, ASTM D1003 for haze, and thermal cycling tests per IEC 60068-2-14

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

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Manufacturers of Reflective Sheet

Manufacturer profiles associated with Reflective Sheet.

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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 reflective sheet in an LCD backlight unit?