What are the applications of bidirectional polyimide films in the optical industry
Bidirectional polyimide film (BOPI, containing colorless transparent CPI) has become a key material in optical display, optical communication, optoelectronic sensing, aerospace and other fields due to its core optical and mechanical advantages such as high transparency, low birefringence, high temperature resistance, bending resistance, and dimensional stability. It is particularly irreplaceable i
Bidirectional polyimide film (BOPI, containing colorless transparent CPI) has become a key material in optical display, optical communication, optoelectronic sensing, aerospace and other fields due to its core optical and mechanical advantages such as high transparency, low birefringence, high temperature resistance, bending resistance, and dimensional stability. It is particularly irreplaceable in flexible optical scenes.
1、 Flexible Display and Optical Panel (Core Application)
1. Folding/Curling Flexible Screen Core Material
Flexible OLED substrate: replaces traditional glass, supports flexible light-emitting layer, withstands high temperature (≥ 250 ℃) in panel manufacturing process, and can achieve millions of bending cycles.
Folding screen cover/external window: Colorless and transparent CPI (light transmittance ≥ 85%), combining hardness and flexibility, impact resistance, and scratch resistance, is the core cover solution for folding phones, tablets, and laptops.
Flexible touch sensor substrate: As an ITO/metal mesh conductive layer carrier, it achieves curved and folded touch, lightweight and optically uniform.
2. Display optical functional film
Polarizing film/phase difference film: Utilizing the molecular orientation of biaxially stretched molecules to regulate birefringence, flexible polarizing film and 1/4 wave plate are prepared, suitable for curved/folded displays.
Anti reflection/anti reflection film: Low surface roughness (nanometer level), can be coated with optical film layer to enhance display contrast and visibility.
Flexible backlight module film material: high temperature resistant, dimensionally stable, used for guiding, brightening, and shading layers of flexible backlight.
2、 Optical Communication and Integrated Optics
Flexible optical waveguide: low optical loss, controllable refractive index, used for inter chip optical interconnection and coupling, achieving high-speed and high-density optical signal transmission.
Thermooptic/electro-optic modulator: Fluorinated BOPI is used for thermo optic switches, with fast response (μ s level), low communication band loss, and suitable for high-speed optical networks.
Optical isolator/polarization controller: As a flexible optical component substrate, it is compatible with integrated optical paths and flexible fiber systems.
3、 Optoelectronic sensing and imaging
Flexible image sensor substrate: supports CMOS/CCD photosensitive array to achieve curved and wearable imaging (such as medical endoscopes and smart wearables).
Infrared/ultraviolet sensing window: resistant to high temperatures and radiation, used as a protective window and filter substrate for infrared thermal imagers and ultraviolet detectors.
Optical sensor packaging: photo sensitive PI (PSPI) photolithography molding, used as a device passivation layer and stress buffer layer to protect the optical chip.
4、 Aerospace and Special Optics
Space optical components: large aperture optical lens/reflector substrate, light shield, lightweight, space radiation resistant, and temperature resistant.
Solar sail/flexible photovoltaic: As a flexible solar cell substrate, it has high transparency, weather resistance, and lightweight, suitable for spacecraft and portable energy.
High temperature optical window: resistant to high temperatures around rockets/engines, used for infrared monitoring and flame imaging systems.
5、 Other optical applications
Optical filter/prism substrate: high transparency, size stability, used for color filtering and spectral components in precision optical systems.
Flexible optical lens/lens: molded lightweight lens, suitable for drones and wearable cameras.
Laser protection/optical damping film: resistant to high temperatures and laser damage, used for isolation and protection of laser systems.
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