Diagonal Touch Grid Layout for Narrow-Bezel Touchscreen Displays
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Solution Overview
Problem
Conventional touchscreen displays in portable information handling systems face challenges in minimizing the bezel size due to the routing of X-Y grid wires, which limits the reduction of the display's footprint and overall dimensions.
Innovation Solution
A touch detection grid with overlapping conductive traces aligned parallel to the diagonals of a rectangular protective cover, allowing the traces to exit from opposing parallel sides and interface with a touch controller, reducing the need for bezel coverage and enabling a smaller bezel size of 1.5 mm or less.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If conventional X-Y grid wires are routed around the display perimeter through the bezel, then touch detection functionality is achieved, but the bezel size increases to 2.85 mm or greater
Solution Approach 1:
The patent transitions from conventional horizontal/vertical wire routing to diagonal wire routing at approximately 45 degrees relative to the display edges. This dimensional change in routing orientation allows wires to exit from corners rather than along the perimeter, reducing the required bezel size from 2.85 mm or greater to 1.5 mm or less while maintaining touch detection functionality.
Solution Approach 2:
Instead of routing wires from the display center outward to the bezel perimeter as in conventional designs, the patent inverts the approach by routing wires diagonally from corners inward, with wire exits positioned at the corners rather than along the edges. This inversion of routing topology eliminates the need for wires to traverse the full perimeter distance.
2Length of moving object
If the display bezel is reduced to minimize portable information handling system footprint, then mobility is improved, but touch detection wire routing becomes more difficult
Solution Approach 1:
The patent employs asymmetric diagonal routing where wires are positioned at approximately 45-degree angles relative to the display edges, creating an asymmetric pattern that optimizes corner exit positioning. This asymmetric geometry allows wires to reach corner exits more directly, reducing the required bezel width while maintaining manufacturability through consistent angular positioning.
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 reduces the bezel size and overall dimensions of portable information handling systems by eliminating the need for touch detection lines along the display perimeter, enhancing mobility and usability.
Implementation Method 1
Generally, information handling system touchscreen displays rely upon capacitive touch detection to detect inputs. Several types of capacitive touch detection are available although all generally apply capacitive coupling at an electric field to measure any conductive body.
Implementation Method 2
Said otherwise, the touch detection grid has a set of aligned antennae that each detect near field effect.
Data Source
AI summary
A portable information handling system display provides a narrow bezel footprint with a diagonally disposed touch grid that passes touch detection conductive traces from opposing parallel sides of a rectangular protective cover. In one embodiment, the protective cover at the opposing parallel sides folds to the rear of the display to interface the touch grid to one or more cables and a touch controller.