Knob-on-Display Base Assembly for Stable Touchscreen Contact

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Solution Overview

Problem

Existing knobs on display (KoDs) for touch screen devices face issues such as mechanical complexity, unreliable electrical connections, and susceptibility to foreign elements like water and dirt, which affect their performance and adhesion to the touch screen.

Innovation Solution

The design incorporates a base assembly that secures the knobs with a full adhesive surface area, maintaining electrode pads in constant engagement proximity to the touch sensor, and uses a folded flexible printed circuit or conductive overmold to ensure reliable electrical connections and reduced mechanical travel distance, while preventing ingress of foreign elements.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If existing KoDs are glued to the touch screen device, then they can be attached to the display, but they suffer from unreliable electrical connections and susceptibility to foreign elements

Engineering Contradiction:

Improveelectrical connection reliabilityVSAvoidsusceptibility to foreign elements

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

A base assembly is introduced as an intermediary component between the KoD and the touch screen device. This base assembly includes a recess that receives and secures the KoD, providing a protected interface that maintains reliable electrical connections while preventing foreign elements from reaching the electrode pads and touch sensor interface.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The KoD is nested within a recess of the base assembly, creating a layered structure where the base assembly encapsulates the KoD's electrical interface. This nesting arrangement protects the electrode pads and connection points from direct exposure to foreign elements while maintaining electrical functionality.

Inventive Principle:

Principle #7Nested doll (Nesting)

2Ease of manufacture

If KoDs are directly attached to the touch screen, then attachment is simple, but adhesion is insufficient and mechanical complexity increases

Engineering Contradiction:

Improveattachment simplicityVSAvoidadhesion strength

Core Design Contradiction:

Ease of manufactureVSStrength

Solution Approach 1:

The attachment system is segmented into distinct functional components: the base assembly with adhesive surface for mounting to the touch screen, and the recess structure for securing the KoD. This segmentation allows each component to be optimized for its specific function while simplifying the overall manufacturing process.

Inventive Principle:

Principle #1Segmentation

3Strength

If mechanical structures are used to secure KoDs, then structural support is provided, but mechanical complexity increases

Engineering Contradiction:

Improvestructural supportVSAvoidmechanical complexity

Core Design Contradiction:

StrengthVSDevice complexity

Solution Approach 1:

The base assembly merges multiple functions into a single component: it provides structural support through its rigid construction, secures the KoD through the recess geometry, enables attachment to the touch screen via adhesive surface, and protects electrical connections. This consolidation reduces mechanical complexity compared to using separate components for each function.

Inventive Principle:

Principle #5Merging (Combining)

Data Source

PatentUS20250224778A1Base assemblies for knob on display devices and related systems, methods, and devices

Publication Date: 2025.07.10 ATMEL CORP

AI summary

Knob on display (KoD) devices and related systems, methods, and devices are disclosed. A KoD device includes at least one electrode including an electrically conductive material. The KoD device also includes a base assembly configured to be positioned between a touch screen of a touch screen device and the at least one electrode. The at least one electrode is configured to be positioned in engagement proximity to a touch sensor of the touch screen device through the base assembly.