LCD Panel Module with Integrated Grounding Chassis
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Solution Overview
Problem
LCD devices face challenges in manufacturing due to the complexity of integrating multiple components, including issues with grounding of printed wiring boards, potential damage during transportation and assembly, and contamination of the LCD panel.
Innovation Solution
An integrated LCD panel module design that includes a liquid crystal display panel with a printed wiring board, a first frame-shaped chassis in front, and a second conductive frame-shaped chassis behind, which allows for easy grounding and protection of the panel through the integration of optical sheets and diffusing plates, reducing the risk of damage and contamination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of repair
If the LCD panel and backlight unit are separated, then the backlight can be exchanged for repair, but the printed wiring board becomes difficult to ground and circuit elements are vulnerable to damage during transportation
Solution Approach 1:
The device is divided into two separable units: an LCD panel unit and a backlight unit. The LCD panel unit includes the printed wiring board mounted on the rear surface, while the backlight unit contains the light source and optical components. This segmentation enables independent exchange of the backlight for repair while maintaining grounding stability through the integrated panel unit design.
Solution Approach 2:
The printed wiring board is nested within the LCD panel unit structure, specifically mounted on the rear surface and electrically connected to the LCD panel. This nested configuration protects circuit elements during transportation and assembly while ensuring stable grounding without requiring external chassis connections.
2Reliability
If the printed wiring board is mounted on the rear surface of the LCD panel, then circuit elements are protected, but grounding becomes difficult without a separate chassis
Solution Approach 1:
The rear surface mounting structure serves multiple functions: it protects circuit elements during transportation and assembly, provides a stable mounting position for the printed wiring board, and enables grounding through the integrated panel unit. This multi-functional design eliminates the need for separate grounding chassis while simplifying the manufacturing process.
Solution Approach 2:
The LCD panel unit structure itself provides grounding functionality through its integrated design. The printed wiring board is electrically connected to the LCD panel and grounded through the panel unit's internal structure, making the system self-sufficient for grounding without requiring external chassis or additional grounding components.
3Productivity
If multiple components are integrated into a single module, then the number of parts to be treated in manufacturing is reduced, but the complexity of integration and assembly increases
Solution Approach 1:
The device is segmented into two main modules: the LCD panel unit and the backlight unit. Each module is independently manufactured and assembled, reducing the overall integration complexity while maintaining manufacturing efficiency. The LCD panel unit integrates the printed wiring board and optical components, while the backlight unit contains the light source and support structures.
Solution Approach 2:
The LCD panel and optical components are merged into a single integrated panel unit, reducing the number of separate parts that need to be handled during manufacturing. This merging simplifies the assembly process while maintaining the functional integrity of each component.
Data Source
AI summary
Disclosed is a liquid crystal display panel module. The liquid crystal display panel module includes a liquid crystal display panel in which a liquid crystal layer is sandwiched between a pair of substrates facing each other, a printed wiring board which is electrically connected to the liquid crystal display panel, a first frame-shaped chassis which is arranged in front of the liquid crystal display panel, and a second frame-shaped chassis which is electrically conductive and arranged behind of the liquid crystal display panel. In the liquid crystal display panel module, the liquid crystal display panel is held by the first chassis and the second chassis. And, the second chassis and a grounding electrode of the printed wiring board are electrically connected by attaching the printed wiring board to the second chassis.