Light guide film (LGF)

Light guide film (LGF), which has the characteristics of ultra-thin, uniform illumination, and various colors, is mainly used in mobile phone buttons. It is a product that converts LED point light sources into surface light sources through colored light guide films.

LGF

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Light guide film and PCB assembly structure

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Thickness
LGF (0.20mm)+Dome sheet(0.3mm) =Max. 0.50mm

Made by molding
Material: light guide fiber film
Thickness: 0.125–0.200mm

light guide film backlighting

What are the backlighting options for membrane switches?

One way to enhance the user experience and make your device stand out from the competition is to incorporate backlighting into the membrane switch design. Backlighting involves strategically placing lights within the membrane switch structure to make keypads, legends, and displays easier to read. Depending on the backlighting method used, there are specific cosmetic and cost pros and cons to consider. Shanyo can guide you in the most cost-effective backlighting technology for user interface assembly and offers a full suite of backlighting technologies, including:

 

Light guiding film (LGF)
Shanyo also offers other backlit membrane switch options, such as a front dead zone that features icons that are invisible until illuminated. Continue reading below to learn more about these backlight technologies and options.

LGF

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Flex Light Guiding Film (LGF)

Light guide film (LGF) is a thin-film backlight technology that directs light generated by side-lit or right-angle LEDs to areas that require backlighting.
The advantage of LGF is that the film can be processed into almost any shape to provide consistent backlighting in one or more areas within the switch.

Multiple LGF films can be used in an application to provide discrete backlighting for different graphic features.
Different colored LEDs can be used to achieve unique lighting effects, or white LEDs can be used to illuminate different printed graphics on the overlay.

LGF

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Lamp position design suggestions(LGF)

Lamp position design suggestions

  • The distance between the lamp and the light-emitting area must be kept above 4mm;
  • When the lamp is in the horizontal direction, the distance between the LED and the edge of the light guide film is recommended to be 0.5mm, and the distance between the light-emitting areas is 1mm.
  • The lamp is in the vertical direction. It is recommended that the height of the LED from the light guide film is about 1.5mm, and the distance between the light-emitting areas is 1mm.
  • The distance from the light-emitting area to the edge is about 1mm or more to ensure uniformity and brightness of the light.
  • The distance from the edge of the LGF board to the edge of the PCB board needs to be based on placement accuracy. It is recommended that the LGF shape is 0.15-0.25mm smaller than the PCB shape on one side.
  • The distance from the edge of the LGF board to the shell needs to be based on the mounting accuracy. It is recommended to keep 0.3-0.5mm.

    • LGF

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    flexible light guide film for electronic

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    LGF Advantage >>

    Light guide film principle

    • Material: light guide fiber film;
    • Use molding/printing methods to produce microstructure dots on light-guiding fiber films;
    • The light emitted by the LED is scattered from the front of the light guide plate through these microstructure dots.
  • Diversified colors on the same plane;
  • Ultra-thin does not affect the feel; thickness is 0.125MM
  • Even light emission;
  • Price concessions;
  • Good stability and easy assembly.
  • Simple manufacturing process, using molding method
  • Design is highly adaptable
  • LGF is a low-cost and low-energy light-conducting material.
  • It is necessary to use software to simulate and design the dot distribution, and then create the dots on the mold.
  • LGF is a transparent film with a high refractive index and light transmittance and has dot microstructures of different densities on the surface.
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