Backlit Touch Interface Masking for Wear-Resistant Control Panels
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Solution Overview
Problem
Traditional interfaces for electronic control devices in refrigeration equipment, such as vending machines, are prone to wear and fatigue due to sensitive touch components, and they lack uniform calibration, leading to limited production efficiency and appearance issues when inactive.
Innovation Solution
The interface features a covering assembly and a tactile assembly with a diffuser layer and a masking layer, allowing for uniform electrical conductivity and graphic patterns that can be easily adapted to different symbols and sizes, ensuring consistent calibration and improved aesthetics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a silver layer is used for touch-sensitive components to ensure light permeability, then the control symbols are visible from the outside, but the interface becomes sensitive to wear and fatigue during working life
Solution Approach 1:
The patent uses a composite structure combining a transparent support layer with a translucent gel layer containing conductive particles. This composite material provides both the required light permeability for visibility and enhanced mechanical durability, replacing the fragile pure silver layer with a more robust composite system that resists wear and fatigue.
Solution Approach 2:
The patent changes the physical state and composition of the conductive layer from a thin metallic silver coating to a gel-based composite with dispersed conductive particles. This parameter change transforms the material properties to achieve both optical transparency and mechanical resilience, solving the contradiction between visibility and durability.
2Shape
If customized silkscreen printed screens are commissioned for different colours and graphics, then the appearance and branding requirements are met, but production economy is deteriorated especially in small batches
Solution Approach 1:
The patent separates the graphic display function from the touch-sensitive functional layer. The translucent gel layer with conductive particles serves as the universal touch interface, while the graphical elements are integrated into the same layer through selective positioning of conductive particles or overlay techniques. This segmentation allows a single base layer to serve multiple customization needs without requiring separate manufactured screens for each design.
Solution Approach 2:
The translucent gel layer with dispersed conductive particles serves as a universal substrate that can accommodate various graphical designs, colors, and symbol configurations without requiring re-manufacturing. The same base layer structure supports multiple customization options, making the interface universally adaptable to different branding and design requirements while maintaining production efficiency.
3Loss of energy
If traditional interfaces are switched off or inactive, then energy consumption is reduced, but the sectors and control icons remain visible which is detrimental for appearance
Solution Approach 1:
The patent utilizes the light-absorbing properties of the conductive particles in the gel layer to create a dynamic appearance effect. When the backlight is active, the translucent gel allows light transmission and the interface is visible. When the backlight is turned off, the conductive particles absorb ambient light, causing the interface to appear dark or invisible, thus improving aesthetics without requiring 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
This solution simplifies the production of interfaces by ensuring uniform reactivity of sensitive pads, eliminating the need for specific calibration, and enhancing the appearance of the control device even when inactive.
Implementation Method 1
a gel layer (25) having a light permeability which allows the formation, through the sensitive pads (19), of luminous symbols which are visible to a user and which are configured to provide a mechanical support for the graphic markings (B)
Implementation Method 2
a matrix layer (21) which is opaque and provided with shaped portions (23) which are permeable to light or transparent. The shaped portions (23) are aligned with, or associated in the region of, the sensitive pads (19), along the thickness of the interface (10)
Implementation Method 3
At least one of the covering assembly (13) and the tactile assembly (14) comprises a diffuser layer (22) which is configured to homogenize a light radiation passing through it
Implementation Method 4
a masking layer (16) which covers, directly or indirectly, a second face of the protective layer (15)... has a light permeability such that the markings B are not visible through the masking layer (16) when the front face (11) is illuminated by a light radiation
Data Source
AI summary
Interface (10) for a control device having a front face (11) and a rear face (12) and comprising a plurality of layers grouped together in a covering assembly (13) and a tactile assembly (14) which extend between the front face (11) and the rear face (12); the covering assembly (13) comprises, in sequence: —a protective layer (15) having a front face (11); —a masking layer (16) which covers, directly or indirectly, a second face of the protective layer (15). The said tactile assembly (14) comprises—an operative layer (17) having sensitive pads (19) which are touch-responsive and permeable to light and transparent: —a matrix layer (21), which is opaque and provided with shaped portions (23) which are permeable to light or transparent or perforated and are aligned with the sensitive pads (19). The shaped portions (23) are configured to form markings (B) able to generate visible luminous symbols following backlighting of the interface (10). The sensitive pads (19) include tracks (18) which are discontinuous and distributed. The masking layer (16) has a light permeability such that the markings (B) are not visible through said masking layer (16) when said front face (11) is illuminated by a light radiation which results in a luminance not exceeding 4000 lx and the interface (10) is not backlit.