ESD Ground Ring on Coverglass for Narrow Bezel Touch Displays
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Solution Overview
Problem
Touch screen displays in information handling systems lack effective electrostatic discharge (ESD) protection, which can damage vulnerable electronics due to the absence of adequate ESD routing mechanisms.
Innovation Solution
Incorporating an ESD ground ring on the coverglass and a second ESD ground ring on the protection layer, both of which are affixed to the touch panel, to provide enhanced ESD protection and allow for a narrower bezel design, thereby routing ESD to a safe electrical ground without damaging sensitive components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional ESD protection methods are used, then ESD protection is provided, but the bezel width must be increased to accommodate ESD routing
Solution Approach 1:
The ESD ground ring is formed on the coverglass surface in an annular pattern around the display area, utilizing the two-dimensional surface space rather than requiring additional linear space in the bezel. This annular configuration allows ESD routing to occur in the vertical dimension (on the coverglass surface) rather than consuming horizontal bezel space.
Solution Approach 2:
The ESD protection is localized to specific areas where it is most needed - the annular ground ring is positioned around the perimeter of the display area on the coverglass, concentrating ESD protection functionality in the regions where electrostatic discharge is most likely to occur without requiring global bezel expansion.
2Reliability
If ESD routing space is allocated in traditional manner, then ESD protection is achieved, but the trace routing portion width must be increased
Solution Approach 1:
The ESD ground ring utilizes the vertical surface area of the coverglass rather than requiring additional horizontal width in the trace routing portion. By forming the ground ring on the coverglass surface in an annular pattern, the design moves ESD routing from the horizontal plane to the vertical plane, eliminating the need for increased trace routing width.
Solution Approach 2:
The coverglass serves multiple functions: it provides the protective front surface of the display, serves as the substrate for the ESD ground ring, and maintains the overall display structure. This multi-functionality allows the ESD protection to be integrated into the existing coverglass without requiring additional space or 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
The solution effectively routes ESD away from sensitive components to a safe electrical ground, preventing damage and enabling a more compact display design by reducing the width of the trace routing portion, thus enhancing both protection and aesthetics.
Implementation Method 1
System and method for ESD protection in a touch screen display
Implementation Method 2
an ESD ground ring on the coverglass
Data Source
AI summary
System and methods for ESD protection in a touch screen display are disclosed. A touch screen display for an Information Handling System (IHS) include a coverglass, an ESD ground ring on the coverglass; and a touch panel proximate to the coverglass. An information handling system includes a display housing including a bezel adapted to retain a plurality of display components; the plurality of display components including a coverglass, an ESD ground ring on the coverglass; and a touch panel proximate to the coverglass. Methods are also disclosed.