Curved Display PCB Segmentation and Lateral Movement
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Solution Overview
Problem
In curved surface display devices, the increased curvature of printed circuit boards (PCBs) after assembly leads to tensile stress on carrier tapes, causing damage and poor functionality due to their weak and flexible nature.
Innovation Solution
The design includes a display device with a curved display panel, two PCBs connected by carrier tapes, and a connection unit that allows the PCBs to move laterally, reducing stress concentration and using a polyimide layer and conductive layers to enhance durability, with the method involving laser cutting to separate the PCBs and rotate them to the rear of the bottom chassis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If the PCB curvature is increased to match the curved display panel, then the display device achieves the desired curved shape, but tensile stress is applied to the carrier tapes causing damage and poor functionality
Solution Approach 1:
The invention divides the single rigid PCB into multiple segments (first PCB and second PCB) that can move independently. This segmentation allows each PCB segment to accommodate the curved shape while reducing the tensile stress on carrier tapes by enabling lateral movement, thus resolving the contradiction between achieving curved shape and maintaining carrier tape integrity.
Solution Approach 2:
The invention introduces dynamic capability by allowing the PCB segments to move laterally relative to each other. This dynamic adjustment enables the structure to adapt to the curved shape requirements while continuously managing stress distribution, preventing the carrier tapes from being torn by excessive static tensile force.
2Adaptability or versatility
If the carrier tapes are made more flexible to accommodate curvature changes, then the PCB can be rotated to the rear of the bottom chassis, but the carrier tapes become more susceptible to stress and damage
Solution Approach 1:
By segmenting the PCB into multiple movable parts, the invention reduces the overall stress burden on each carrier tape while maintaining the flexibility needed for rotation. The segmented structure distributes the mechanical load, allowing the carrier tapes to accommodate curvature changes without being overly susceptible to damage.
Solution Approach 2:
The invention introduces connection units as intermediary elements between the PCB segments and carrier tapes. These connection units act as stress-distributing mediators that protect the carrier tapes from direct stress concentration, enabling rotation to the rear position while reducing vulnerability to stress damage.
3Strength
If a rigid connection is used between PCB segments to maintain structural stability, then the overall structure is stronger, but stress concentration occurs at the connection points
Solution Approach 1:
The invention employs dynamic connection between PCB segments that allows controlled movement rather than rigid fixation. This dynamic connection maintains structural stability while preventing stress concentration by enabling the segments to move laterally, distributing the stress away from the carrier tapes and connection points.
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
This configuration minimizes deformation and damage to carrier tapes and PCBs, ensuring the display device operates effectively by distributing stress and maintaining the structural integrity of the carrier tapes and driver integrated circuits.
Implementation Method 1
the method involving laser cutting to separate the PCBs
Data Source
AI summary
A display device may include a display panel having a curved shape, a first printed circuit board and a second printed circuit board, at least one first carrier tape configured to connect the first printed circuit board to the display panel, at least one second carrier tape configured to connect the second printed circuit board to the display panel, and a connection unit configured to connect the first and second printed circuit boards to each other. A part of a layer of the connection unit may be a portion of a layer included in at least one of the first and second printed circuit boards.