Voltage Clamper Ground Structure for Mobile Terminal ESD Protection
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Solution Overview
Problem
The narrow frame design of touchscreens in mobile terminals makes them susceptible to electrostatic discharges directly reaching the liquid crystal module, causing damage due to the short path of static electricity, which existing technologies fail to effectively mitigate.
Innovation Solution
A ground structure comprising a touchscreen ground wire, a voltage clamper, and a metal middle frame, where the voltage clamper connects the touchscreen ground wire to the metal middle frame, allowing static electricity to be discharged safely away from the liquid crystal module, and preventing galvanic effects when no static electricity is present.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If the touchscreen frame is made narrower to achieve a bezel-less design, then the aesthetic appearance and screen-to-body ratio are improved, but the distance from the touchscreen edge to the liquid crystal module becomes shorter, making it easier for static electricity to discharge directly to the liquid crystal module and cause damage
Solution Approach 1:
The patent introduces a voltage clamper circuit as an intermediary component between the touchscreen ground wire and the metal middle frame. This voltage clamper acts as a mediator that only conducts when the voltage exceeds a threshold, thereby protecting the liquid crystal module from electrostatic discharge while maintaining the narrow frame design. The voltage clamper bridges the gap between the touchscreen grounding system and the metal frame, providing conditional electrostatic protection without requiring a wider frame.
2Reliability
If the touchscreen ground wire is continuously connected to the metal middle frame to discharge static electricity, then electrostatic protection is improved, but galvanic effect occurs when both contact electrolyte, causing layer separation of the touchscreen ground wire and touchscreen
Solution Approach 1:
The patent employs a dynamic connection mechanism through the voltage clamper circuit, which switches between connected and disconnected states based on voltage conditions. When static electricity is detected (voltage exceeds threshold), the voltage clamper connects the touchscreen ground wire to the metal middle frame for discharge. When no static electricity is present, the connection is disconnected, preventing galvanic effect and electrolyte-induced layer separation. This dynamic switching resolves the contradiction between continuous electrostatic protection and structural stability.
3Stability of the object's composition
If a voltage clamper is introduced to conditionally connect the touchscreen ground wire to the metal middle frame, then protection against galvanic effect is improved, but the device complexity increases
Solution Approach 1:
The patent utilizes parameter changes in voltage to control the connection state between the touchscreen ground wire and metal middle frame. The voltage clamper monitors the voltage parameter and switches its conductive state accordingly - remaining non-conductive under normal voltage conditions to prevent galvanic effect, and becoming conductive when voltage exceeds the threshold indicating static electricity. This parameter-based control mechanism provides intelligent protection without requiring complex control circuits or additional components.
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
Effectively protects the mobile terminal from electrostatic damage by ensuring static electricity is discharged through the ground structure, while avoiding layer separation issues that can occur from electrolyte contact.
Implementation Method 1
a first terminal of the voltage clamper is electrically connected to the touchscreen ground wire, a second terminal of the voltage clamper is electrically connected to the metal middle frame
Implementation Method 2
effectively avoids a problem in which the touchscreen ground wire and the metal middle frame contact electrolyte simultaneously to generate a galvanic effect
Data Source
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AI summary
The embodiments of the present disclosure provide a ground structure and a mobile terminal. The ground structure includes: a touchscreen ground wire, a voltage clamper, and a metal middle frame, wherein a first terminal of the voltage clamper is electrically connected to the touchscreen ground wire, a second terminal of the voltage clamper is electrically connected to the metal middle frame, and the touchscreen ground wire is arranged on a frame of a touchscreen of the mobile terminal, so as to discharge static electricity entering from a side of the touchscreen. Thus, when the static electricity enters the mobile terminal from the side of the touchscreen, the ground structure discharges the static electricity to realize an electrostatic protection of the mobile terminal. Further, when no static electricity enters the mobile terminal from the side of the touchscreen, the present disclosure may effectively avoid a problem in which the touchscreen ground wire and the metal middle frame contact electrolyte simultaneously to generate a galvanic effect which causes a layer separation of the touchscreen ground wire and the touchscreen.