Display FPCB Guide Members for BLU Stress Reduction
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Solution Overview
Problem
The deformation of the flexible printed circuit board (FPCB) in electronic devices leads to stress transfer to the back light unit (BLU) of the display, causing light refraction and local color changes in the display due to the separation and spacing of the display driver IC (DDI) and processor PCBs.
Innovation Solution
Incorporating guide members within the electronic device housing to manage the stress on the FPCB, either by generating opposite-directed stress or adhering the FPCB to guide members to cancel out stress, thereby reducing deformation and maintaining display functionality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the DDI and processor PCBs are separated and spaced apart to improve heat dissipation and signal integrity, then the reliability of electrical connection is improved, but the FPCB undergoes deformation and transfers stress to the BLU causing display quality degradation
Solution Approach 1:
The patent introduces guide members as intermediary structures between the FPCB and the BLU. These guide members constrain the FPCB's deformation path and prevent direct stress transfer to the BLU, thereby maintaining electrical connection reliability while eliminating the harmful stress effect on the display
Solution Approach 2:
The patent segments the stress management function by introducing separate guide members at different locations along the FPCB. The first guide member constrains deformation in the first region while the second guide member manages stress in the second region, allowing independent control of stress at different locations to prevent BLU damage
2Adaptability or versatility
If the FPCB is made more flexible to accommodate internal structure deformation, then the adaptability of the circuit board layout is improved, but the FPCB transfers more stress to adjacent components like the BLU
Solution Approach 1:
The patent applies local quality by providing guide members at specific locations where stress concentration occurs. The guide members are strategically positioned to provide localized constraint only where needed, allowing the FPCB to remain flexible in other regions while preventing stress transfer at critical points near the BLU
3Object-affected harmful factors
If guide members are added to constrain FPCB deformation and reduce stress transfer, then the display quality is improved, but the device complexity increases
Solution Approach 1:
The guide members are designed as thin, flexible constraint structures that can be easily integrated into the existing device architecture. These thin-film-like guide members provide the necessary mechanical constraint while occupying minimal space and adding minimal complexity to the overall device structure
Solution Approach 2:
The guide members serve multiple functions: they constrain FPCB deformation, guide the FPCB's bending path, and prevent direct contact between the FPCB and BLU. This multi-functionality reduces the need for additional separate components, thereby limiting the increase in device complexity while achieving comprehensive stress management
Data Source
AI summary
An electronic device is provided. The electronic device includes a housing, a display disposed inside the housing, the display disposed in a first direction so that a screen of the display is exposed to an outside of the housing, a first printed circuit board (PCB) disposed inside the housing, a flexible printed circuit board (FPCB) disposed inside the housing and including a first portion adjacent to the display and a third portion extending from the first portion and electrically connected with the first PCB, a first guide member disposed inside the housing, and a second guide member disposed inside the housing. At least a portion of the third portion may be disposed to pass between the first guide member and the second guide member. The at least the portion of the third portion may be provided with force in a second direction opposite to the first direction by the first guide member.