OPTICAL DIFFUSER FILMS: COMPARE DATA AND BACKLIGHT PERFORMANCE
Editable planning/verification record — Yenra
Updated: October 2, 2026
Article: https://yenra.com/optical-film/

Purpose: Prepare a comparison that connects optical and dimensional data to an assembled-backlight trial.
Intended reader: Display engineers and sourcing teams comparing diffuser-film candidates.

HOW TO USE
Save a working copy. Enter the actual specification, units, assumptions and evidence references in each field. Preserve original observations and record changes. Have the responsible reviewer resolve missing or conflicting requirements before release. Examples below are fictional teaching inputs, not process settings or acceptance standards.

RECORD
1. Display/backlight requirement, viewing conditions and acceptance limits:
   ____________________________________________________________

2. Film grade, thickness in mm, sample lot and surface orientation:
   ____________________________________________________________

3. Transmission/haze methods, spectrum and instrument geometry:
   ____________________________________________________________

4. Angular distribution, FWHM definition and incident-light conditions:
   ____________________________________________________________

5. Stack order, spacing in mm, light-source drive and thermal condition:
   ____________________________________________________________

6. Luminance grid locations and values in cd/m2; uniformity formula:
   ____________________________________________________________

7. Handling, mounting, environmental exposure and before/after defects:
   ____________________________________________________________

8. Control sample, repeat measurements and approval evidence:
   ____________________________________________________________


WORKED EXAMPLE AND LIMITS
Fictional fixed-grid comparison using min/max luminance: A has 420/500 = 84%; B has 450/490 = 91.84%, rounded 91.8%. B has the higher min/max ratio but a lower measured maximum. Keep the full grid, average luminance and required viewing conditions before selecting a film. This ratio is a stated trial metric, not a universal standard.

REVIEW
Prepared by / date: ____________________
Reviewed by / date: ____________________
Open issues, responsible owner, due date: ____________________
Approved next action and evidence: ____________________

SOURCE CONTEXT
These primary references support the linked article. Use exact applicable product, contract, and document versions for operational work.
BYK's transparency-measurement white paper
https://media.byk-instruments.com/shop/Misc/Whitepaper/White_Paper_Transparency_Measurement_EN_20220427.pdf
Luminit's diffuser FAQ
https://luminitco.com/resources/faqs-for-light-shaping-diffusers/

Return to the guide: https://yenra.com/optical-film/