Circuit board and display apparatus

By designing a specific structure on the circuit board of an OLED display, the edge intersection and bending of the shielding layer disperse stress, solving the problem of signal discontinuity and breakage when the flexible printed circuit board is bent, thus improving signal stability and electromagnetic interference resistance.

WO2026157941A1PCT designated stage Publication Date: 2026-07-30BOE TECHNOLOGY GROUP CO LTD +1
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Patent Information

Authority / Receiving Office
WO · WO
Patent Type
Applications
Current Assignee / Owner
BOE TECHNOLOGY GROUP CO LTD
Filing Date
2026-01-05
Publication Date
2026-07-30

AI Technical Summary

Technical Problem

The flexible printed circuit boards of existing OLED displays are prone to stress concentration in the EMI shielding film when bent, which leads to signal discontinuity, distortion and packet loss in the MIPI differential signal lines. At the same time, the EMI shielding film is also prone to breakage.

Method used

Design a circuit board structure in which signal lines include a trace section, a transition section, and a connection section. The edge of the shielding layer is designed as a straight line segment and an arc segment. The straight line segment intersects the signal line perpendicularly, and the arc segment intersects part of the signal line to ensure that the signal line coverage length is consistent and to distribute bending stress in the transition section area.

Benefits of technology

It effectively avoids signal discontinuity and packet loss problems in MIPI differential signal lines, improves the anti-breakage performance of the shielding layer, and enhances the electromagnetic interference resistance and overall quality of the display device.

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  • Figure CN2026070445_30072026_PF_FP_ABST
    Figure CN2026070445_30072026_PF_FP_ABST
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Abstract

A circuit board and a display apparatus. The circuit board comprises a base layer; a wiring layer, located on one side of the base layer, the wiring layer comprising a plurality of signal lines, the plurality of signal lines being arranged in a first direction and extending in a second direction, and the first direction intersecting the second direction, wherein each signal line comprises a wiring portion, a transition portion and a connection portion which are sequentially arranged in the second direction, the signal lines comprise a first signal line, a second signal line and a third signal line, and the first signal line and the second signal line are adjacent and have signals of the same magnitude and opposite phases; and a first shielding layer, located on the side of the wiring layer facing away from the base layer, wherein the first shielding layer covers the wiring portions and part of each transition portion, and the orthographic projections of the first shielding layer and the connection portions on the base layer do not overlap. A first edge of the first shielding layer located in the region where the transition portions are located comprises a straight line segment and an arc line segment, wherein the straight line segment is at least perpendicular to and intersects with the orthographic projections of the first signal line and the second signal line on the base layer, and the arc line segment intersects with the orthographic projection of at least part of the third signal line on the base layer.
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