Curved Display Flexible Substrates Radial Stress Distribution
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Solution Overview
Problem
The curved shape of display apparatuses applies stress to flexible substrates, reducing their electrical connection reliability due to uneven distribution of stress across the substrates.
Innovation Solution
The use of flexible substrates with radially extending connection portions connected to both the curved display panel and printed circuit board, where the connection portions are spaced apart in a specific pattern to distribute stress evenly, enhancing the reliability of electrical connections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If flexible substrates are used to connect curved display panel and printed circuit board, then electrical connection is enabled, but stress is applied to substrates reducing connection reliability
Solution Approach 1:
The patent applies different spacing configurations to different connection portions of the flexible substrate. Specifically, first connection portions are spaced at a first pitch while second connection portions are spaced at a second pitch different from the first. This local differentiation allows stress to be distributed non-uniformly across the substrate, with certain areas providing stress relief zones while maintaining electrical connectivity. The local quality principle resolves the contradiction by making the substrate's connection structure non-uniform, thereby reducing overall stress while preserving connection reliability.
Solution Approach 2:
The flexible substrate is divided into multiple connection portions (first connection portions and second connection portions) with different spacing arrangements. Each connection portion is independently configured with specific pitch values, creating segmented stress distribution zones. This segmentation allows the substrate to handle stress differently in various regions, preventing uniform stress concentration and improving overall connection reliability under curved configuration.
2Reliability
If connection portions are spaced apart to distribute stress, then reliability improves, but manufacturing precision requirements increase
Solution Approach 1:
The patent specifies different pitch parameters for different connection portions: a first pitch for first connection portions and a second pitch for second connection portions. By changing the spacing parameter locally across different regions of the flexible substrate, the design optimizes stress distribution while providing clear manufacturing guidelines. The parameter change from uniform to non-uniform spacing resolves the contradiction by establishing specific, controllable pitch values that balance reliability improvement with manufacturability.
Data Source
AI summary
A curved display apparatus includes a curved display panel, a driver, a controller and a plurality of flexible substrates. The curved display panel extends in a tangential direction with respect to a first axis direction. The driver applies a driving signal to the curved display panel. The controller includes a curved printed circuit board extending in the tangential direction with respect to a first axis direction. The controller applies a control signal to the driver. The flexible substrates electrically connect the curved printed circuit board with the curved display panel. Each of the flexible substrates includes a first connection portion connected to the curved display panel, a second connection portion connected to the curved printed circuit board and a flexible substrate body connecting the first connection portion with the second connection portion. The flexible substrate body extends in a radial direction with respect to the first axis direction.