HVAC Controller Touch Screen ESD Protection Using Perimeter Trace
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Solution Overview
Problem
Existing HVAC control systems face challenges in ease of use, assembly, construction, and reliability, particularly in integrating touch screen displays and printed circuit boards effectively.
Innovation Solution
The integration of a touch screen display with a conductive trace on its viewing side and a printed circuit board with a grounding feature on its non-viewing side, connected via a connector, along with a frame that releasably connects the printed circuit board and touch screen display, enhances electrical communication and assembly reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a touch screen display is integrated with a printed circuit board in an HVAC controller, then the user interface functionality is improved, but the risk of electrostatic discharge damage to electronic components increases
Solution Approach 1:
The patent applies the 'Blessing in disguise' principle by converting the harmful electrostatic discharge into a beneficial protective mechanism. A conductive trace is disposed on the viewing side of the touch screen display adjacent to the perimeter, which actively seeks out and captures ESD events. When ESD occurs, the trace provides a controlled path to channel the discharge current away from sensitive electronic components and toward a grounding feature on the printed circuit board, thereby transforming the harmful ESD into a protected system state.
Solution Approach 2:
The patent employs the 'Intermediary' principle by introducing a conductive trace as a mediator between the touch screen display and the printed circuit board. This trace acts as an intermediate ESD collection network that intercepts electrostatic discharge before it can reach vulnerable electronics. The trace serves as a buffer zone that captures and redirects ESD current through a connector to a grounding feature on the PCB, preventing direct exposure of sensitive components to harmful discharge currents.
2Ease of manufacture
If a connector is used to electrically connect the conductive trace and the printed circuit board, then the assembly process is simplified, but the potential connection failure points increase
Solution Approach 1:
The patent applies the 'Preliminary action' principle by pre-configuring the conductive trace network on the touch screen display before final assembly. The trace is disposed adjacent to the perimeter of the display during manufacturing, establishing the ESD collection pathway in advance. This preliminary configuration ensures that when the display is assembled with the printed circuit board, the ESD protection mechanism is already in place and ready to function immediately, reducing the need for additional assembly steps while maintaining reliability.
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
This configuration improves the ease of use and assembly of HVAC control systems by providing a reliable electrical connection and enhanced structural integrity, leading to improved user interface and system reliability.
Implementation Method 1
ESD protection mechanism for an HVAC controller
Data Source
AI summary
An electronic sub-assembly for an HVAC Controller includes a touch screen display and a printed circuit board. The touch screen display including a viewing side and a non-viewing side. A conductive trace is disposed on the viewing side of the touch screen display adjacent a perimeter of the touch screen display. The printed circuit board, which includes a grounding feature, is positioned adjacent the non-viewing side of the touch screen display. A connector is in electrical communication with the conductive trace and the grounding feature of the printed circuit board.