Roughened Cover Layer for Vehicle Touch Screens
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Touch-sensitive screens in vehicles face challenges with high reflection and visibility issues due to ambient light, especially glare, and existing anti-reflection coatings are not suitable for these applications as they are sensitive to fingerprints and have poor scratch resistance.
Innovation Solution
A touch-sensitive screen design featuring a rigid cover layer with a roughened surface, a polarization layer, and a touch sensor layer, optimized for low reflection and improved haptic properties, using materials like glass or plastic with anti-fingerprint coatings and specific surface roughness and thickness configurations to minimize glare and enhance visibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a smooth surface is used on the cover layer, then the screen appearance is aesthetically pleasing and has good visibility, but the screen exhibits high reflection of ambient light and glare
Solution Approach 1:
The patent applies a roughened surface treatment specifically to the cover layer while maintaining other layers smooth, creating localized optical diffusion at the surface level without affecting the overall screen appearance or touch sensitivity
Solution Approach 2:
The roughened cover layer acts as an intermediary between ambient light and the screen display, diffusing incident light before it reaches the display surface, thereby reducing glare and reflections that would otherwise directly affect visibility
2Ease of operation
If the cover layer is made thin to reduce weight and improve touch sensitivity, then the device becomes lighter and more responsive, but the structural strength and scratch resistance decrease
Solution Approach 1:
The patent uses a composite structure with a rigid cover layer (glass or plastic) combined with a polymer layer, where each material contributes different properties - the rigid layer provides scratch resistance while the thin overall structure maintains touch sensitivity
3Object-affected harmful factors
If anti-reflection coatings are applied to reduce glare, then ambient light reflection is reduced, but the screen becomes sensitive to fingerprints and has poor scratch resistance
Solution Approach 1:
Instead of applying a chemical coating across the entire surface, the patent creates a localized physical roughness pattern on the cover layer surface, achieving optical diffusion without the chemical properties that cause fingerprint sensitivity
Solution Approach 2:
The patent replaces chemical anti-reflection coatings with a mechanical/physical surface structure (roughening), substituting a chemical solution with a physical one that achieves similar optical effects without the drawbacks of fingerprint attraction
4Object-affected harmful factors
If the surface is roughened to reduce reflections, then ambient light scattering is improved, but the screen appears greyish when switched off and loses aesthetic appeal
Solution Approach 1:
The patent carefully controls the roughness parameters of the cover layer surface, optimizing the degree of roughness to achieve sufficient light diffusion while minimizing the greyish appearance when the screen is off
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 reduces ambient light reflections, improves haptic feedback, and maintains aesthetic appeal by adapting surface roughness to screen resolution, while ensuring durability and safety through appropriate material selection and structural design.
Implementation Method 1
diffuse scattering of ambient light on the surface of a screen
Implementation Method 2
a polarization layer arranged beneath the rigid cover layer
Data Source
AI summary
A touch-sensitive screen, in particular for use in a motor vehicle, is described. The screen comprises a rigid cover layer with a roughened surface, a polarization layer arranged beneath the cover layer, a touch sensor layer arranged beneath the polarization layer, and a display of the touch-sensitive screen.