What’s the Difference Between PC, PMMA, and PS Diffuser Sheets?

In the field of LED lighting and LCD backlighting display, the diffuser sheet plays a key role in softening and evenly spreading light. Commonly used materials for diffuser sheets include PC (polycarbonate), PMMA (acrylic), and PS (polystyrene). So, what are the differences between them, and how do you choose the right one?

This article will help you understand the working principle of diffuser sheets, the material differences, and how to select the best one for your application.

1. What Is a Diffuser Sheet?

A diffuser sheet is a flat plastic panel used in lighting systems and display panels. It is produced by adding light-diffusing agents into base materials like PC, PMMA, or PS. These sheets help to scatter and spread light rays, reducing glare, hot spots, and uneven brightness.

Diffuser sheets are widely used in:LED backlight modules,LCD displays,Commercial lighting systems,LED Light boxes, home appliances, and control panels…

2. Optical Principle of Light Diffuser Sheet

The working mechanism of a diffuser sheet is based on the scattering and refraction of light. When light enters the sheet:Microscopic optical diffusing particles alter the path of light rays.This increases the beam angle and spreads the light more uniformly.The surface appears soft, bright, and foggy, which enhances aesthetics and reduces eye strain.

It also boosts energy efficiency by minimizing wasted light and reflections.

Well-designed optical diffuser sheets help improve light output while protecting human vision.

3. Comparison of PC, PMMA, and PS Diffuser Sheets

Though all three materials serve similar purposes, they differ in optical clarity, mechanical strength, and thermal/fire resistance. Here’s a detailed comparison:

Feature &application guidance

PC Diffuser Sheets (Polycarbonate Light Diffuser Panel)

Product Features:

1)Extremely high impact resistance, suitable for harsh environments

2)High flame retardancy, high heat deflection temperature, UL-certified

3）Good dimensional stability, suitable for precision processing

4)Relatively expensive, double-sided protective film increases labor time

5)Excellent strength, high heat resistance, flame retardant

Application:industrial lighting, outdoor applications, and safety zones

PMMA Diffuser Sheets (Acrylic LED Diffuser Sheet)

Produit Features:

1)High light transmittance (up to 90%)

2)Excellent weather resistance, no yellowing for 3-5 years indoors

3)Excellent screen printing and spraying performance, suitable for decorative lighting fixtures

4)Diverse forming processes, including thermal forming, laser cutting, and vacuum forming

5)Moderate impact resistance, higher than PS but lower than PC

6)High light transmittance, elegant appearance, aging-resistant

Application:display backlights, commercial lighting, advertising signs

PS Diffuser Sheets (Polystyrene Light Diffuser Plate)

Produit Features:

1)Lightweight and cost-effective

2)High refractive index with a wide range of haze adjustment

3)Low static electricity, resistant to dust accumulation, and scratch-resistant surface

4)Easy to process, suitable for large-scale production

5)Poor weather resistance, not recommended for outdoor use

Application:indoor use, budget-friendly lighting products

4. We Are a Professional Diffuser Panel Manufacturer

As a trusted diffuser panel manufacturer, we specialize in producing high-quality PC, PMMA, and PS diffuser sheets with flexible customization.

We offer:

Wide material selection for optical diffuser sheets

Custom sizes, thicknesses, haze levels, and transmittance options

Full support for OEM / ODM projects

Reliable quality, fast delivery, and expert technical support
Contact us today to request a quote of our custom diffuser plates!