Photosensitive Display Circuit Using LEDs for Touchless Light Sensing
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Solution Overview
Problem
Display panels require additional sensors for interactivity features, increasing cost and size.
Innovation Solution
Incorporating a photosensitive display circuit with light-emitting diodes that can function both for display and light detection, eliminating the need for separate sensors by utilizing photo-generated currents under different bias conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If additional sensors are integrated into the display panel to provide interactivity functions, then the interactivity and functionality are improved, but the cost and size of the display panel increase
Solution Approach 1:
The light-emitting diode is designed to perform dual functions: displaying light in forward bias mode and detecting light through photo-generated current in reverse bias mode. This eliminates the need for separate light detection sensors, thereby reducing device complexity and cost while maintaining interactivity functionality.
Solution Approach 2:
The patent combines the light emission function and light detection function into a single component (the light-emitting diode). By merging these two previously separate functions into one element, the overall device complexity is reduced while achieving the desired interactivity.
2Adaptability or versatility
If additional sensors are integrated into the display panel to provide interactivity functions, then the interactivity and functionality are improved, but the cost increases
Solution Approach 1:
The light-emitting diode is designed to perform dual functions: displaying light in forward bias mode and detecting light through photo-generated current in reverse bias mode. This eliminates the need for separate light detection sensors, thereby reducing device complexity and cost while maintaining interactivity functionality.
Solution Approach 2:
The patent combines the light emission function and light detection function into a single component (the light-emitting diode). By merging these two previously separate functions into one element, the overall device complexity is reduced while achieving the desired interactivity.
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 normal display functionality while allowing for light detection, reducing the need for additional sensors and thus the cost and size of the display panel.
Implementation Method 1
a row photosensitive data reader, electrically connected to another end of the row readout line to obtain a first photo-generated current flowing through the light-emitting diode
Data Source
AI summary
A display panel and the display device are provided in the present disclosure. The display panel includes a photosensitive display circuit. The photosensitive display circuit includes a light-emitting diode, a pixel driving circuit, and a photosensitive circuit. By multiplexing the light-emitting diode, can not only achieve normal display function under the condition that the light-emitting diode is forward biased, but also achieve light detection according to the photo-generated current following through the light-emitting diode under the condition that the light-emitting diode is reverse biased or no biased. This alleviates the need for an additional light sensor, thereby reducing the cost and size of the display product.