Piezoelectric Display for Self-Powered Annotation
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Solution Overview
Problem
E-reader devices using bi-stable displays require frequent charging due to the need for occasional power to maintain static images, despite their low power consumption compared to backlit LCDs or LED displays.
Innovation Solution
A display device incorporating a piezo-electric layer that generates a voltage differential upon pressure application, allowing direct virtual inking without an active writing implement or power source, with per-pixel storage elements to record and store annotations digitally.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If bi-stable displays are used to reduce power consumption, then power consumption is reduced, but frequent charging is still required to maintain static images
Solution Approach 1:
The display device generates its own power through piezoelectric elements that convert mechanical pressure from user interaction directly into electrical energy. This self-powered mechanism eliminates the need for external charging while maintaining the bi-stable display's low power consumption characteristics, as the energy harvested from writing actions sustains the display without requiring battery replacement or charging.
2Power
If piezoelectric elements are used to generate power from pressure, then power generation capability is improved, but device complexity increases
Solution Approach 1:
The piezoelectric power generation layer is integrated directly into the display structure, merging the power generation function with the display layers. The piezoelectric elements are positioned between conductor layers within the display assembly, combining multiple functions (display, power generation, and structural support) into a single integrated system, thereby reducing overall device complexity despite adding power generation capability.
3Loss of information
If per-pixel storage elements are added to store digital records, then information retention capability is improved, but device complexity increases
Solution Approach 1:
The storage function is segmented into per-pixel storage elements that are distributed across the display area, with each pixel having its own storage capability. This segmentation allows information to be stored locally at each pixel position, enabling digital record keeping without requiring a centralized complex storage system, thereby reducing overall device complexity while improving information retention.
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
Enables a low-latency, erasable, and reusable writing surface with reduced power requirements, allowing users to generate and store digital records of written content without a battery, while maintaining the 'always-on' functionality of bi-stable displays.
Implementation Method 1
a power generation element having a film-like piezoelectric element; and a display part formed on the power generation part and having a memory property. The display part displays presented information by a power generated in response to application of a pressure to the power generation element.
Data Source
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AI summary
A display device is described which can be updated by applying pressure with a passive object. The display device comprises a transparent top conductor layer, a middle conductor layer and a bottom conductor layer. The middle conductor layer is segmented into a plurality of independent areas and a pixel of the display device is defined based at least in part on the way that the middle conductor layer is segmented. The display device further comprises an electrophoretic ink layer between the top and middle conductor layers, a layer of piezo-electric material between the middle and bottom conductor layers, and an electrical connection between the bottom and top conductor layers.