Chip on film and curved display device

By designing anti-crack notches in the flip-chip film, the distortion problem caused by curvature mismatch in curved display devices is solved, stress relief and light leakage are reduced, and product quality is improved.

CN115348722BActive Publication Date: 2026-03-03SUZHOU CHINA STAR OPTOELECTRONICS TECH CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2022-08-10
Publication Date
2026-03-03

AI Technical Summary

Technical Problem

Because the curvature radii of the curved display panel and the printed circuit board are not exactly the same, the flip-chip film is twisted during the connection process, which can easily cause interference between the flip-chip film and the printed circuit board, the curved display panel and adjacent components, resulting in poor light leakage.

Method used

Design a flip-chip thin film, including a first thin film segment, a second thin film segment and a third thin film segment, which are respectively connected to a curved display panel and a printed circuit board. Crack-stopping notches are provided between the thin film segments, and the crack-stopping notches penetrate along the thickness direction to release stress and avoid torsion deformation and interference.

Benefits of technology

It effectively prevents the flip-chip film from tearing due to stress concentration, reduces light leakage defects, and improves product yield.

✦ Generated by Eureka AI based on patent content.

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    Figure CN115348722B_ABST
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Abstract

The application discloses a kind of chip on film and curved surface display device.The chip on film includes first film section, second film section and third film section, and first film section and second film section can be respectively folded to the opposite sides of curved surface display module relative to third film section, and first film section and second film section are adapted to the shape of curved surface display module and extend in curved surface shape;Third film section has the first side edge of connecting first film section and second film section, and first side edge is provided with stop crack gap along its thickness direction.When due to the different radius of curvature of first film section and second film section, third film section produces distortion, the setting of stop crack gap can release stress at the place of larger distortion, avoid chip on film from stress concentration and cause tearing;It can also avoid the interference of the distorted part of chip on film to other components adjacent thereto;It is also helpful to reduce the tensile stress exerted by chip on film on curved surface display panel, thereby reducing light leakage, improving product yield.
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Citation Information

Patent Citations

  • Mounting film for liquid crystal drive chip and method for manufacturing the same

    CN101165553A

  • COF flexible circuit board

    CN105242427A

  • Curved-surface display module and electronic equipment

    CN105242433A