Touch Display Cushion Layer Layout for Uniform Tactile Feedback
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Solution Overview
Problem
Conventional input devices for vehicles, such as automobiles, often cause discomfort due to uneven tactile sensations when users interact with them, and existing solutions do not adequately address this issue.
Innovation Solution
A display device and input device configuration featuring a cushion layer with alternating convex and concave portions, providing a soft tactile sensation while minimizing brightness variations, and incorporating a detector to sense user operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a conventional input device structure is used, then the device can be manufactured simply, but the tactile sensation becomes uneven and uncomfortable
Solution Approach 1:
The cushion layer is segmented into multiple regions with different hardness values. Specifically, the cushion layer includes a first region with a first hardness value and a second region with a second hardness value that is different from the first hardness value. This segmentation allows different portions of the input device to provide different tactile sensations, improving overall tactile uniformity and comfort.
Solution Approach 2:
Different regions of the cushion layer are assigned different local properties (hardness values) to optimize tactile sensation in specific areas. The first region has a first hardness value while the second region has a second hardness value, allowing each region to be optimized for its specific function and position within the input device.
2Ease of operation
If a cushion layer with varying hardness is introduced, then tactile sensation is improved, but manufacturing complexity increases
Solution Approach 1:
The cushion layer is constructed as a composite structure with multiple regions having different hardness values. This composite approach allows the integration of different material properties within a single cushion layer component, achieving improved tactile sensation while maintaining manufacturability through standardized production processes for multi-region components.
3Illumination intensity
If the cushion layer has uniform properties, then manufacturing is simple, but brightness variations occur due to uneven light transmission
Solution Approach 1:
The cushion layer employs local quality variations by assigning different hardness values to different regions. This regional differentiation not only improves tactile sensation but also optimizes light transmission characteristics in each region, reducing brightness variations across the input device surface while maintaining a manageable structural complexity.
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 configuration enhances user comfort by providing a consistent and soft tactile experience, suppresses brightness variations, and improves the reliability of detecting user inputs.
Implementation Method 1
an outer cover (11) that has light transmission properties; a design portion (12) that has light transmission properties and is provided on a front surface side or a back surface side relative to the outer cover (11); a cushion layer (13) that has light transmission properties
Data Source
AI summary
A display device includes: an outer cover with light transmission properties; a design sheet with light transmission properties provided on the outer cover; a cushion layer with light transmission properties provided on a back surface side of the outer cover; and a light source provided on a back surface side of the cushion layer. When viewed in a cross section, the cushion layer includes: a plurality of first concave portions that are in a convex shape in a first orientation and a concave shape on a side opposite to the convex shape; and a plurality of second concave portions that are connected to the first concave portions and are in a convex shape in a second orientation and a concave shape on a side opposite to the convex shape. The first concave portions and the second concave portions are alternately provided.