Shielding Cover Ground Pattern Electrical Coupling
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Solution Overview
Problem
In electronic apparatuses like display devices, achieving a stable electrical coupling between the ground pattern of a printed circuit board and a metal shielding cover is challenging, which can lead to malfunctions due to static electricity and poor contact resistance.
Innovation Solution
A display device design featuring a shielding cover with projecting portions that bite into the ground pattern of the printed circuit board, ensuring a stable electrical connection through a screwing mechanism with a pattern-side through-hole and a cover-side through-hole, allowing a screw member to pass through and facilitating secure fastening with a nut, thereby reducing contact resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a metal shielding cover is used to shield electronic components, then electromagnetic shielding effectiveness is improved, but stable electrical coupling to the ground pattern becomes difficult to achieve
Solution Approach 1:
The shielding cover is divided into multiple separate fastening portions rather than a single continuous structure. Each fastening portion independently contacts the ground pattern at different locations, ensuring stable electrical coupling while maintaining shielding effectiveness. This segmentation allows the cover to reliably connect to multiple ground points simultaneously.
Solution Approach 2:
The fastening portions extend in the second direction (horizontal direction) perpendicular to the light source arrangement, creating a two-dimensional distribution of contact points across the ground pattern. This dimensional expansion ensures comprehensive electrical coupling coverage while maintaining the shielding cover's protective function.
2Ease of manufacture
If conventional fastening methods are used, then assembly is simple, but contact resistance increases and electrical coupling becomes unstable
Solution Approach 1:
The shielding cover is designed with pre-formed fastening portions that are prepared in advance during manufacturing. These fastening portions are positioned and shaped to optimally contact the ground pattern before assembly, ensuring low contact resistance and stable electrical coupling is achieved automatically during the assembly process without requiring additional adjustment steps.
3Reliability
If the shielding cover is positioned to overlap the ground pattern, then electrical coupling is improved, but the structure becomes more complex
Solution Approach 1:
The shielding cover simultaneously performs multiple functions: it provides electromagnetic shielding, establishes electrical coupling through the ground pattern, and maintains structural positioning. The fastening portions are designed to achieve electrical coupling while the overall cover structure provides shielding, eliminating the need for separate components and reducing overall structural complexity despite the overlapping configuration.
Data Source
AI summary
According to an aspect, a display device includes: a light source provided on a back surface side of a display panel; a printed circuit board provided on a back surface side of the light source; a shielding cover that covers the printed circuit board; a screwing member; and a projecting portion. A surface of the printed circuit board facing the shielding cover is provided with a ground pattern electrically coupled to the shielding cover. The ground pattern has a pattern-side through-hole therein, and the pattern-side through-hole penetrates the ground pattern and allows a screw member to pass therethrough. The shielding cover has a cover-side through-hole therein, and the cover-side through-hole overlaps the ground pattern and allows the screw member to pass therethrough. The screwing member is screwed onto the screw member. The projecting portion is provided in an area surrounding the cover-side through-hole and projects toward the ground pattern.