Touch Screen Grounding for Vehicle Diagnostic Reliability
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Solution Overview
Problem
Vehicle diagnostic tablet computers' touch screens are prone to burnout due to short circuits or electrostatic breakdown when used in harsh environments, such as high-temperature and high-humidity repair shops, leading to abnormal function or complete failure.
Innovation Solution
A touch screen design featuring a touch assembly with a flexible circuit board and a metal support, where a first grounding portion on the flexible circuit board is electrically connected to a second grounding portion on the metal support, enhancing anti-static performance by providing effective grounding treatment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the touch screen is used in harsh environments (high temperature, high humidity, sun exposure, cold weather) without special grounding treatment, then the touch screen can operate in these environments, but the peripheral wires are prone to burnout due to short circuit or electrostatic breakdown
Solution Approach 1:
The patent applies preliminary grounding treatment to the touch screen structure before deployment in harsh environments. The metal support frame is connected to the housing through a grounding connection, and the touch function layer is connected to the metal support frame through a conductive layer, establishing a grounding path in advance to prevent electrostatic breakdown and short circuits of peripheral wires
Solution Approach 2:
The patent introduces a metal support frame as an intermediary component between the touch function layer and the housing. This metal support frame serves as a grounding intermediary, connecting the conductive layer of the touch function layer to the grounding connection on the housing, thereby providing a dedicated path for electrostatic discharge and preventing wire burnout
2Reliability
If grounding treatment is added to the touch screen structure, then anti-static performance and wire reliability are improved, but the device complexity increases
Solution Approach 1:
The patent makes the metal support frame serve multiple functions: it provides structural support for the touch function layer, acts as a grounding conductor, and serves as a mounting platform for the conductive layer. By making the metal support frame multi-functional, the patent avoids adding separate dedicated grounding components, thus improving anti-static performance without significantly increasing structural complexity
Solution Approach 2:
The patent merges the grounding function with the existing metal support frame and conductive layer components. Instead of adding a separate grounding system, the patent combines the grounding function with components already present in the touch screen structure, thereby reducing overall device complexity while achieving effective electrostatic protection
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The grounding treatment prevents peripheral wire burnout due to short circuits or electrostatic breakdown, thereby improving the reliability and longevity of the touch screen in harsh environments.
Implementation Method 1
one side of the conductive layer being stacked on the surface of the metal sheet, and the other side of the conductive layer being connected to the second grounding portion
Implementation Method 2
the first grounding portion further comprises an adhesive layer, the first grounding portion being bonded to the second grounding portion via the adhesive layer
Data Source
AI summary
A touch screen, a display panel, and a vehicle diagnosis equipment. The touch screen (100) is applied to the vehicle diagnosis equipment. The touch screen (100) comprises: a touch assembly (20) and a metal support (40). The touch assembly (20) comprises a touch function layer (22) and a flexible circuit board (24). The touch function layer (22) is electrically connected to the flexible circuit board (24). The flexible circuit board (24) is provided with a first grounding portion (26). The first grounding portion (26) is electrically connected to the flexible circuit board (24). The metal support (40) is grounded, and the metal support (40) is provided with a second grounding portion (42). The first grounding portion (26) is electrically connected to the second grounding portion (42). By providing the first grounding portion (26) on the flexible circuit board (24), electrically connecting the first grounding portion (26) to the flexible circuit board (24), providing the second grounding portion (42) on the metal support (40), and electrically connecting the first grounding portion (26) to the second grounding portion (42), a touch assembly can be grounded to enable peripheral wires to be not prone to burnout due to short circuit or electrostatic breakdown, thereby improving the anti-static performance of the touch screen (100).