Touch Control Diffuser Foil for Readable Appliance Displays
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Solution Overview
Problem
Existing operating units for household appliances often require multiple foils and complex structures, leading to increased costs and reduced optical performance, especially under difficult lighting conditions.
Innovation Solution
The operating unit incorporates a diffusor foil with a printed character layer on the top side and a printed functional layer on the underside, which includes capacitive touch electrodes and conductor tracks, simplifying the structure and enhancing optical readability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If multiple foils (symbol foil and diffuser foil) are used in the operating unit, then the optical readability is improved, but the structural complexity and manufacturing cost increase
Solution Approach 1:
The patent combines the symbol display function and light diffusion function into a single diffuser foil with printed characters. The character layer is printed directly on the diffuser foil, eliminating the need for a separate symbol foil. This merging of functions reduces structural complexity while maintaining optical readability, as the printed characters on the diffuser foil serve both as symbols and as part of the light diffusion mechanism.
2Illumination intensity
If multiple foils are used in the operating unit, then the optical readability is improved, but the manufacturing cost increases
Solution Approach 1:
By merging the symbol foil and diffuser foil into a single component, the patent reduces the number of manufacturing steps, materials required, and assembly operations. The character layer is printed directly on the diffuser foil in one process, eliminating the need for separate production and assembly of multiple foils, thereby reducing manufacturing cost while maintaining optical readability.
3Loss of information
If a symbol foil is used separately from the diffuser foil, then the character display is achieved, but the structure becomes less robust and more expensive
Solution Approach 1:
The patent integrates the character display function directly into the diffuser foil by printing the character layer on it. This creates a single robust component that combines both light diffusion and character display functions, eliminating the structural weaknesses and assembly issues associated with separate foils, while ensuring reliable character display under various lighting conditions.
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 design results in a more cost-effective, robust, and optically superior operating unit with improved readability under various lighting conditions, while also reducing the number of components and undesirable reflections.
Implementation Method 1
an LED unit (136) positioned on a rear side of the touch-sensitive unit (106)
Implementation Method 2
The diffusor foil also serves to equalize the light emitted by the LED unit
Implementation Method 3
the functional layer has a plurality of capacitive touch electrodes, each of which is embodied, when a finger of the operator becomes physically close, to generate an analyzable electrical signal
Data Source
AI summary
An operating unit for a domestic appliance has a touch-sensitive unit and an LED unit positioned on the rear thereof. The touch-sensitive unit is formed with a diffuser foil which has a top side, facing an operator, provided with a printed character layer and an underside, directed away therefrom, provided with a printed functional layer. This leads to a simpler structure of the operating unit with a smaller number of components, which permits a cost-optimized manufacturing process, and also a higher display contrast with the simultaneous reduction of undesirable reflection effects.