Rollable Display Grounding Structure for Stable Antenna Performance
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Solution Overview
Problem
Rollable displays in electronic devices face challenges with complex inner structures and deteriorated antenna performance due to capacitance between the display and housing, affecting wireless communication.
Innovation Solution
The electronic device incorporates a flexible display that rolls inside a housing with a conductive coupling member to maintain consistent antenna performance by grounding the display to the housing during extension and retraction, using an actuator to move the housing parts and a conductive coupling member for electrical connection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a rollable display is implemented in an electronic device, then the display can be folded or rolled to change form factor, but the inner structure becomes complex and antenna performance deteriorates due to capacitance between the display and housing
Solution Approach 1:
The flexible display is rolled into a housing space similar to a nested doll structure, where the display is stored inside the housing when not in use. This nesting approach allows the rollable display to be compact while maintaining the ability to extend when needed, resolving the contradiction between adaptability and structural complexity.
Solution Approach 2:
The housing is divided into a first housing part and a second housing part that can move relative to each other. This segmentation allows the display to be extended between the two parts while keeping the overall structure manageable, reducing the complexity burden of having a fully movable rollable display system.
2Adaptability or versatility
If a rollable display is implemented in an electronic device, then the display can be folded or rolled to change form factor, but antenna performance deteriorates due to capacitance between the display and housing
Solution Approach 1:
The conductive coupling member is extracted from the housing structure to specifically address the capacitance issue. By separating this grounding component from the main housing body and positioning it to contact the display at specific points, the design isolates the capacitance management function, thereby protecting antenna performance while maintaining form factor adaptability.
Solution Approach 2:
The conductive coupling member acts as an intermediary between the display and the housing grounding system. It mediates the electrical connection by providing a controlled path for capacitance discharge, preventing direct capacitance buildup between the display and housing that would otherwise degrade antenna performance.
3Reliability
If a conductive coupling member is added to ground the display to the housing, then antenna performance is maintained, but the device structure becomes more complex
Solution Approach 1:
The conductive coupling member is designed to serve multiple functions: it provides grounding for the display, maintains mechanical connection between housing parts, and facilitates the movement of the second housing part. By combining these functions into a single component, the structure remains relatively simple while achieving reliable antenna performance.
Solution Approach 2:
The conductive coupling member merges the grounding function with the mechanical connection function. Instead of adding a separate grounding wire or component, the design combines electrical grounding and mechanical support into one integrated element, minimizing structural complexity while maintaining reliability.
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
Ensures consistent antenna performance regardless of the display's rolled or unrolled state, addressing structural complexity and maintaining wireless communication effectiveness.
Implementation Method 1
the conductive coupling member may be electrically coupled to the second housing part so that the flexible display is grounded to the second housing part
Data Source
AI summary
An electronic device is provided. The electronic device includes a housing including a first housing part and a second housing part movably joined with the first housing part between a retracted position and an extended position with respect to the first housing part, a flexible display joined with the first housing part and the second housing part so that a region viewed to a front side of the housing changes in size with movement of the second housing part between the retracted position and the extended position, an actuator configured to move the second housing part with respect to the first housing part, and a conductive coupling member disposed at one end of the flexible display and extending in a direction facing the second housing part. The flexible display may be rolled inside the second housing part toward a rear side of the second housing part. The one end of the flexible display may move in a lengthwise direction of the second housing part in vicinity of the rear side of the second housing part with the movement of the second housing part between the retracted position and the extended position with respect to the first housing part. When the second housing part moves from the retracted position to the extended position with respect to the first housing part, the conductive coupling member may be electrically coupled to the second housing part so that the flexible display is grounded to the second housing part.