Flexible Polymer Substrate for Compact Display Integration
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Solution Overview
Problem
Existing electronic devices face challenges in incorporating displays without increasing size and weight, often resulting in bulky designs due to large borders and unnecessary housing adjustments, which affect aesthetics and functionality.
Innovation Solution
The use of a polymer substrate layer that extends to form both a display and additional structures like a polymer film and flexible printed circuit, with transition regions that minimize the need for additional connecting structures and reduce the risk of disconnection, allowing for a more compact and aesthetically pleasing design by sharing layers and using conductive vias for electrical connections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If traditional separate structures are used for display and connecting components, then structural simplicity is maintained, but device size and weight increase due to bulky borders and additional housing adjustments
Solution Approach 1:
The patent merges the display substrate and connecting circuit board into a single integrated flexible substrate structure. The flexible substrate serves dual functions as both the display backing and the circuit interconnection medium, eliminating the need for separate connecting components and reducing overall device volume while maintaining structural functionality.
Solution Approach 2:
The flexible substrate is designed to perform multiple functions simultaneously: it serves as the structural support for the display, the flexible circuit board for electrical connections, and the mounting platform for display components. This multi-functionality eliminates the need for separate dedicated components, reducing device size and weight.
2Reliability
If separate connecting structures are used between display and circuit board, then manufacturing simplicity is maintained, but reliability decreases due to increased risk of disconnection
Solution Approach 1:
By combining the display substrate and circuit board into a single flexible substrate, the patent eliminates separate connecting structures that are prone to disconnection. The integrated design ensures permanent structural bonding between display elements and circuit traces, significantly improving connection reliability while the transition regions maintain manufacturing feasibility.
3Reliability
If a single contiguous flexible polymer substrate layer is used for multiple structures, then connection reliability is enhanced, but manufacturing complexity increases due to multi-functional layer requirements
Solution Approach 1:
The flexible polymer substrate is engineered as a universal platform that simultaneously supports display pixel structures, conductive traces for electrical connections, and mechanical flexibility requirements. This multi-functional design consolidates multiple components into one element, enhancing reliability while the standardized fabrication process manages manufacturing complexity.
Solution Approach 2:
The flexible substrate is divided into distinct functional regions including a display region with pixel structures, transition regions with intermediate structures, and circuit board regions with conductive traces. This segmentation allows each region to be optimized for its specific function while maintaining continuity and integration across the entire substrate, balancing reliability and manufacturability.
Data Source
AI summary
An electronic device may be provided with a display such as an organic light-emitting diode display. The display may include an array of display pixels formed on a polymer substrate layer. The polymer substrate layer may include an contiguous layer of polyimide that forms a substrate layer in additional structures such as a polymer film and a flexible printed circuit. A first transition region may be interposed between the display and the polymer film, and a second transition region may be interposed between the polymer film and the flexible printed circuit. Metal traces may be formed on the polymer film and on the flexible printed circuit. A display driver integrated circuit may be mounted to the traces on the polymer film. The polymer film may form a U-shaped bend. The flexible printed circuit may be coupled to a printed circuit board in the device using hot bar solder connections.