Display Module Flat Area Circuit Board Alignment
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Solution Overview
Problem
In the field of display technologies, particularly for Micro-OLED displays used in AR/VR devices, there is a challenge in ensuring proper alignment and high display uniformity due to the integration of electronic components around the display substrate, which can lead to short circuits and damage from the circuit board's non-flat areas.
Innovation Solution
A display module design featuring a circuit board with a flat area for the display substrate and a non-flat periphery for electronic components, where a plastic frame covers the non-display area to protect components and prevent damage, ensuring a flat surface for alignment and uniformity, and includes a metal line connection for bonding pads to secure the substrate to the board.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If electronic components are integrated around the display substrate on the circuit board, then the system volume is reduced and functionality is enhanced, but the non-flat areas cause misalignment with optical structures and reduce display uniformity
Solution Approach 1:
The circuit board is segmented into a flat area and a non-flat area, with the display substrate positioned on the flat area and electronic components arranged on the non-flat area. This segmentation allows the display substrate to maintain precise alignment with optical structures while electronic components are accommodated in the non-flat peripheral region, resolving the conflict between system integration and alignment precision.
Solution Approach 2:
The circuit board transitions from a traditional two-dimensional flat structure to a three-dimensional structure with distinct flat and non-flat areas. This dimensional change enables electronic components to be positioned in the non-flat peripheral area without interfering with the alignment of the display substrate on the flat area, thus maintaining both compact integration and precise alignment.
2Adaptability or versatility
If electronic components are placed on the circuit board periphery, then integration is improved, but the non-flat areas expose metal lines and bonding pads to damage and short circuits
Solution Approach 1:
A protective layer is introduced as an intermediary element that covers the metal lines and bonding pads in the non-flat area of the circuit board. This protective layer prevents direct exposure of electrical connections to external damage while allowing electronic components to be integrated in the non-flat peripheral area, thus maintaining both integration and electrical connection reliability.
Solution Approach 2:
A thin film protective layer is applied over the non-flat area of the circuit board to shield metal lines and bonding pads. This flexible thin film conforms to the non-flat surface topology while providing continuous protection against short circuits and physical damage, enabling reliable integration of electronic components in the peripheral non-flat area.
3Ease of manufacture
If the circuit board has a non-flat periphery for electronic components, then component placement is optimized, but the overall surface flatness required for alignment is compromised
Solution Approach 1:
The circuit board surface is segmented into a flat central area for the display substrate and a non-flat peripheral area for electronic components. This segmentation allows each region to be optimized for its specific function: the flat area ensures surface flatness for precise alignment with optical structures, while the non-flat peripheral area facilitates optimal placement of electronic components.
Solution Approach 2:
Different regions of the circuit board are given different surface qualities: the central area maintains flatness for alignment purposes, while the peripheral area is designed with non-flat topology to accommodate electronic components. This local differentiation of surface quality allows simultaneous optimization of alignment precision and component placement ease.
Data Source
AI summary
A display module is provided, which includes a circuit board and a display substrate disposed on a first surface of the circuit board, the first surface of the circuit board comprises a flat area and an non-flat area located at a periphery of the flat area, the display substrate is disposed in the flat area, and the non-flat area is provided with electronic components.