PCB Module Segmentation for LCD Signal Processing
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Solution Overview
Problem
The high cost of double-layer PCB modules in LCDs due to their complexity and the need for redesigning when internal circuits need to be changed, especially when used with different LCD panels in mass manufacturing, increases manufacturing costs.
Innovation Solution
A PCB module configuration that includes a single-layer PCB for low-frequency signal processing components and a double-layer PCB for high-frequency components, allowing for electrical connection between the two, reducing costs and enabling easier redesign or substitution of high-frequency components without altering the single-layer PCB layout.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a double-layer PCB is used for the entire PCB module, then high-frequency signal interference is reduced, but the manufacturing cost increases and redesign complexity increases
Solution Approach 1:
The PCB module is segmented into two distinct parts: a single-layer PCB for low-frequency signal processing and a double-layer PCB for high-frequency signal processing. This segmentation allows each part to be optimized independently, reducing overall complexity while maintaining the benefits of double-layer construction where needed.
Solution Approach 2:
The double-layer PCB structure is applied locally only to the region handling high-frequency signals, while the single-layer PCB is used for low-frequency signals. This local application of complexity ensures that high-frequency interference protection is provided only where necessary, reducing overall manufacturing cost and design complexity.
2Reliability
If the signal processing circuit is integrated in a double-layer PCB, then high-frequency signal processing is improved, but the cost of mass manufacturing different LCD panels increases
Solution Approach 1:
The signal processing circuit is divided into two segments: low-frequency processing on the single-layer PCB and high-frequency processing on the double-layer PCB. This segmentation enables independent optimization and flexible configuration of each part, improving adaptability to different LCD panel requirements.
Solution Approach 2:
The modular architecture allows the high-frequency processing part to be dynamically adjusted or replaced based on different LCD panel requirements, while the low-frequency part remains stable. This dynamic configurability enhances versatility for mass manufacturing different LCD panels.
3Ease of manufacture
If a single-layer PCB is used for the entire PCB module, then manufacturing cost is reduced, but high-frequency signal interference increases
Solution Approach 1:
The PCB module is segmented into single-layer and double-layer portions, allowing the majority of the board (handling low-frequency signals) to be manufactured cost-effectively as single-layer, while only the critical high-frequency section benefits from the more expensive double-layer construction.
Solution Approach 2:
The expensive double-layer PCB structure is applied locally only to the high-frequency signal processing region where interference protection is critical, while the rest of the board uses cost-effective single-layer construction, balancing manufacturing cost with interference protection.
4Reliability
If the entire PCB module is redesigned when internal circuits need to be changed, then all components can be optimized together, but the time and cost of redesign increases
Solution Approach 1:
The PCB module is segmented into independent single-layer and double-layer sections that can be designed and modified separately. This allows targeted redesign of only the affected section rather than the entire board, significantly reducing redesign time and cost while maintaining overall system optimization.
Solution Approach 2:
The modular architecture enables dynamic redesign of individual components or sections without affecting the entire system. The high-frequency processing part can be independently modified to accommodate new requirements while the low-frequency part remains unchanged, reducing overall redesign time.
Data Source
AI summary
An exemplary printed circuit board (PCB) module (20) used in a liquid crystal display (LCD) includes a single-layer PCB (31) and a double-layer PCB (32) configured to be electrically connected to the single-layer PCB. The single-layer PCB includes a first part of a signal processing circuit (23). The double-layer PCB includes a second part of the signal processing circuit (23).