BFM / 3M / Vikuiti DBEF-D400 / 17 ×17 in / 45°

Diffuse multilayer film recycles polarization in an LCD backlight. Nominal thickness 400 µm; published haze 80% ±4%. Align its transmission axis with the LCD rear polarizer.

3M DBEF-D400 principle diagram, used to explain polarization recycling. The illustrated light fractions are not performance specifications for this item.

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Terms and Conditions

Internal Reference: BFM-3007-00

Application and configuration

Polarization recycling

Reflective polarizers return the unused polarization to the backlight cavity for another opportunity to be transmitted. Align the transmission axis to the LCD rear polarizer and verify the assembled stack. A family diagram does not establish the gain of a particular grade.

Cut-part drawing and orientation

Define the cut outline, usable aperture, thickness, tabs, notches, corner radii and tolerances. Identify prism direction or transmission axis, structured/coated face, liner handling and a physical orientation datum. A 0° or 45° catalog reference must be tied to the drawing datum.

Backlight development and repair

Use the material in a custom optical stack or evaluate it against the original film in an existing backlight. Review luminance, uniformity, viewing angle, polarization, color and temperature behavior. Repair acceptance is based on the assembled display and agreed requirements; a similar gauge or family name does not establish equivalence.

From reference to a controlled part

Start with the application and available space. Develop a drawing with custom dimensions and performance specifications, review the proposed configuration, and evaluate samples where needed. Record the approved drawing revision and acceptance criteria for the supplied part. Availability and final configuration are confirmed during quotation.

Technical documents

3M DBEF D400 legacy — maintained PDF

Request grade-specific technical data

Review the document revision and exact grade or ordering code. Family guidance may describe a different construction; final limits belong to the selected part specification.

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