Touch Panel Piezoelectric Energy Harvesting for Longer Display Runtime
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Solution Overview
Problem
Existing electroluminescent display devices face limitations in power efficiency due to the reliance on battery power in portable devices, which restricts the duration of operation and functionality.
Innovation Solution
The integration of a piezoelectric element between the display panel and the touch panel, which generates electrical energy from external mechanical forces, such as touch inputs, and stores it in a battery using a rectifying circuit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of moving object
If a battery is used to power the portable display device, then the device can operate portably, but the operation duration is limited due to battery power constraints
Solution Approach 1:
The piezoelectric element enables the display device to generate its own electrical energy from mechanical inputs (touch, pressure, or movement), allowing the device to partially power itself and extend operation duration without external power sources
Solution Approach 2:
The system converts mechanical energy parameters (force, pressure) into electrical energy parameters through the piezoelectric effect, creating an additional power source that supplements the battery and improves overall power efficiency
2Use of energy by moving object
If a piezoelectric element is integrated to generate electrical energy from mechanical forces, then power efficiency is improved, but the device structure becomes more complex
Solution Approach 1:
The piezoelectric element serves multiple functions simultaneously: it acts as both an energy harvesting device and a touch sensor, while also providing structural support between the display panel and touch panel, thereby adding power generation capability without proportionally increasing complexity
Solution Approach 2:
The piezoelectric element is integrated into the existing layered structure of the display device, merging the energy harvesting function with the existing display and touch interface components, reducing the need for separate additional systems
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 configuration enhances the power efficiency of the display device by harnessing mechanical energy from user interactions to recharge the battery, thereby extending the device's operational time and improving its overall performance.
Implementation Method 1
a piezoelectric element under the touch panel and including an upper electrode, a lower electrode and a piezoelectric layer
Data Source
AI summary
A display device includes a touch panel; a display panel under the touch panel and displaying an image; a piezoelectric element under the touch panel and including an upper electrode, a lower electrode and a piezoelectric layer; and a rectifying circuit connected to the piezoelectric element.