Flexible Display Panel Bending Area EMI Shielding
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Solution Overview
Problem
Products with a bending design at the frame in display devices experience signal interference with the antenna, leading to decreased antenna sensitivity due to incomplete coverage by the EMI shielding film in the bending area.
Innovation Solution
A flexible display panel with a first and second metal layer, where the second metal layer includes metal patterns or wires that cover the traces in the bending area, effectively reducing signal noise interference by extending the metal shielding coverage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a black film layer is used as EMI shielding film on the back surface of the OLED panel, then signals of electronic components are shielded, but the bending area cannot be completely covered by the shielding film, causing signal interference with the antenna
Solution Approach 1:
The patent extends the EMI shielding structure from a single planar layer to a three-dimensional configuration by adding a second metal layer above the first metal layer in the bending area. This vertical stacking creates overlapping shielding coverage that follows the bent contour of the display panel, ensuring complete coverage of the bending area and preventing signal interference with the antenna.
Solution Approach 2:
The patent implements a nested shielding structure where the second metal layer is positioned above and overlaps with the first metal layer in the bending area. This nested configuration creates multiple layers of shielding that completely cover the bending area, preventing signal leakage and interference while maintaining a compact structure.
2Reliability
If the EMI shielding film covers the bending area, then signal interference is reduced, but the antenna sensitivity decreases due to signal radio frequency interference
Solution Approach 1:
The patent applies different shielding configurations to different areas of the display panel. The bending area receives enhanced dual-layer shielding coverage, while other areas maintain standard single-layer shielding. This localized quality enhancement ensures effective signal shielding in the critical bending area without unnecessarily affecting antenna performance in other regions.
Solution Approach 2:
The patent segments the EMI shielding structure into distinct regions: the first metal layer covers the entire back surface including the bending area, while the second metal layer is specifically positioned above the bending area traces. This segmentation allows targeted shielding of the problematic bending area while minimizing impact on antenna sensitivity in other regions.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The additional metal layer significantly reduces signal noise interference with the antenna, enhancing antenna sensitivity and preventing RF DE-SENSE issues in bending areas of display devices.
Implementation Method 1
the black film layer is a composite material. As an electromagnetic interference (EMI) shielding film, the black film layer mainly shields signals of various electronic components on a printed circuit board and an integrated circuit
Data Source
AI summary
A flexible display panel and a display device are provided. The display device includes a display area and a bending area located outside the display area. The bending area includes: a first flexible area, a first metal layer, an organic insulating layer, and a second metal layer. The first metal layer includes a plurality of traces, and the second metal layer includes a plurality of metal patterns. Orthographic projections of the plurality of metal patterns on the first flexible area completely cover orthographic projections of the first traces and the second traces on the first flexible area.