Multi-Level Pressure Sensing Display Device
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Solution Overview
Problem
Conventional display devices lack the capability to recognize pressure at multiple levels, which limits their functionality and user interaction.
Innovation Solution
A display device with a pressure key that includes a first electrode, a second electrode, a pressure-sensitive material, and spacers in separate areas, allowing for varying minimum heights and electrical resistance changes in response to pressure, enabling the recognition of different pressure levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a conventional single-level pressure key is used, then the device structure is simple, but the device cannot recognize pressure at multiple levels
Solution Approach 1:
The pressure key is divided into multiple distinct areas (first area, second area, third area) with different spacer heights. Each area contains spacers of a specific height that define a minimum height for the pressure-sensitive material in that area. This segmentation allows the pressure key to detect different pressure levels by measuring pressure sensitivity variations across the different areas, thereby enabling multi-level pressure recognition while maintaining a relatively simple overall structure.
Solution Approach 2:
Different areas of the pressure key are designed with different local properties - specifically, different spacer heights (first spacer height, second spacer height, third spacer height) that create different minimum heights for the pressure-sensitive material. This local quality variation means each area has distinct pressure sensitivity characteristics, allowing the system to recognize multiple pressure levels by comparing responses from different local areas.
2Measurement precision
If the pressure-sensitive material has uniform thickness, then the manufacturing process is simple, but the device cannot generate distinct signals for various pressure inputs
Solution Approach 1:
The pressure-sensitive material is divided into multiple regions (first region, second region, third region) corresponding to different areas of the pressure key. Each region has a different minimum thickness controlled by the underlying spacers. This segmentation allows the material to have varying thickness characteristics in different regions, enabling distinct electrical resistance changes and signal generation for different pressure levels applied to different areas.
Solution Approach 2:
The pressure-sensitive material exhibits different local thickness properties in different regions. The first region has a first minimum thickness, the second region has a second minimum thickness, and the third region has a third minimum thickness. These local quality differences create distinct pressure sensitivity characteristics in each region, allowing the system to differentiate between various pressure inputs while the manufacturing process only needs to ensure the material meets the minimum thickness requirements defined by the spacer heights.
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 display device can sense pressures at multiple levels, providing a more nuanced and responsive user interface by generating distinct signals for various inputs.
Implementation Method 1
a pressure-sensitive material disposed between the first electrode and the second electrode
Data Source
AI summary
A display device includes a display panel having a display area and a non-display, an input sensing unit overlapping the display panel, a cover window overlapping the input sensing unit, a first electrode overlapping the non-display area and disposed between the cover window and the input sensing unit, a second electrode disposed between the cover window and the first electrode, a pressure-sensitive member disposed between the first electrode and the second electrode, and a first spacer and a second spacer both disposed between the first electrode and the second electrode. A first minimum thickness of the pressure-sensitive member corresponds to the first spacer. A second minimum thickness of the pressure-sensitive member corresponds to the second spacer and is unequal to the first minimum thickness of the pressure-sensitive member.