Metal Insert Grounding for LCD Backplane
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Solution Overview
Problem
In liquid crystal displays (LCDs) with a plastic backplane, the display driving circuit board cannot be effectively grounded due to the inability to establish an electrical connection with the metal front frame, leading to potential grounding failures and inconvenience during rework processes when using conductive aluminum foils.
Innovation Solution
An LCD design featuring a metal insert that electrically connects the display driving circuit board to the metal front frame through a first and second insert, which are securely positioned and connected using bumps or concave holes, providing reliable grounding and facilitating easy assembly and disassembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If a plastic backplane is used to reduce module weight, then the weight of the LCD module is reduced, but the display driving circuit board cannot be electrically connected with the metal front frame, resulting in grounding failure
Solution Approach 1:
The patent introduces a metal insert as an intermediary component between the plastic backplane and the display driving circuit board. This metal insert serves as a mediator to establish the electrical connection pathway that would otherwise be impossible between the insulated plastic backplane and the metal front frame, thereby resolving the grounding issue while maintaining the lightweight plastic backplane structure.
Solution Approach 2:
The patent creates a composite structure by integrating a metal insert within the plastic backplane assembly. This composite design combines the advantages of both materials: the plastic backplane provides weight reduction and insulation, while the metal insert provides electrical conductivity and grounding capability, thus resolving the contradiction between weight reduction and grounding reliability.
2Reliability
If conductive aluminum foil is attached between the display driving circuit board and the metal front frame to achieve grounding, then electrical connection is established, but the aluminum foil may fall resulting in grounding failure and requires removal and reattachment during rework
Solution Approach 1:
The patent extracts the problematic conductive aluminum foil from the design and replaces it with a metal insert that is integrally formed with or firmly attached to the plastic backplane. This extraction eliminates the issues of foil detachment and simplifies rework, as the metal insert remains permanently secured while allowing easy access to the display driving circuit board for removal and reattachment operations.
3Ease of manufacture
If the display driving circuit board is fixed by bending to the back surface of the plastic backplane, then the circuit board can be mounted, but the circuit board cannot be effectively grounded due to the insulation property of the plastic backplane
Solution Approach 1:
The patent segments the backplane structure by introducing a distinct metal insert component separate from the plastic backplane. This segmentation allows the plastic backplane to maintain its insulation properties for structural support, while the metal insert specifically provides the grounding function, thus resolving the contradiction between ease of mounting and electrical grounding reliability.
Data Source
AI summary
The invention discloses a liquid crystal display (LCD) based on an insulation backplane. The LCD comprises a backplane, a display driving circuit board, and a metal front frame, wherein the backplane comprises a sidewall at the side surface of the LCD and a base plate at the bottom surface of the LCD; the metal front frame is fixedly connected with the sidewall of the backplane; and the display driving circuit board is fixed on the base plate. The LCD also comprises a metal insert, and the display driving circuit board is electrically connected with the metal front frame through the metal insert. In the invention, the display driving circuit board is connected with the metal front frame through the metal insert, compared with a conductive aluminum foil, the metal insert has higher strength and reliability, and the problems of falling, damage, tearing, etc. are not easy to occur. In addition, the metal insert can be assembled and disassembled as a whole conveniently, and thus, no additional trouble can be caused in the rework process.