Photo Sensor Mode Switching for Battery Charging
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Solution Overview
Problem
Existing display apparatuses lack an efficient method for charging, particularly when not in use for displaying images or sensing external objects.
Innovation Solution
A display apparatus that includes a substrate with pixels and photo sensors, where the photo sensors can operate in three modes: displaying images, sensing light reflected from external objects, and charging a battery using external light, thereby utilizing light-receiving elements for charging when not in use for imaging or fingerprint sensing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the display apparatus is used for image display or fingerprint sensing, then the device functionality is maintained, but the charging capability is unavailable
Solution Approach 1:
The photo sensor is designed to perform multiple functions: it serves as a light-receiving element for fingerprint sensing, as a display element for image display, and as a power generation element for charging the battery. This multi-functionality allows the device to maintain charging capability while preserving image display and fingerprint sensing functions through mode switching controlled by the controller.
2Use of energy by moving object
If the photo sensor is used for charging, then energy harvesting is optimized, but the image display and fingerprint sensing functions are reduced
Solution Approach 1:
The system dynamically switches the photo sensor between different operational modes (image display mode, fingerprint sensing mode, and charging mode) based on real-time requirements. The controller adjusts the operating mode of the photo sensor and light-emitting diode accordingly, allowing the device to optimize energy harvesting when needed while maintaining image display and fingerprint sensing capabilities when required.
3Loss of energy
If the light-receiving element is used for charging when not in use, then energy efficiency is improved, but the device complexity increases
Solution Approach 1:
The photo sensor automatically serves dual purposes: when not actively used for image display or fingerprint sensing, it autonomously generates power to charge the battery. The controller manages the switching between modes, enabling the system to self-replenish energy without requiring external charging devices or complex additional power management infrastructure.
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 solution enables the display apparatus to function as a battery charger using ambient light, even when not engaged in image display or fingerprint sensing, thus optimizing energy harvesting and device functionality.
Implementation Method 1
a photo sensor arranged in the display area of the substrate and configured to receive light reflected from an external object in a second mode, and receive external light in a third mode
Data Source
AI summary
A display apparatus includes a substrate, a pixel arranged in a display area of the substrate and including a light-emitting diode configured to emit light in a first mode, and a photo sensor arranged in the display area of the substrate and configured to receive, in a second mode, light reflected from an external object and receive external light in a third mode. The first mode is triggered by a signal to display an image, the second mode is triggered by reflection from the external object, and the third mode is triggered by absence of the signal to display an image and reflection from the external object.