Integrated Optical Sensing Layout With Shared Light-Shielding Signal Lines
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Solution Overview
Problem
Current sensing devices face challenges in simplifying the integrated structure of light sources and sensing elements, which affects their efficiency and configuration density.
Innovation Solution
The integration of a light-shielding layer that serves as a signal line for the light-emitting element, allowing it to also function as a signal line for the sensing element, along with a light angle control layer that can act as a signal line for the light-emitting element, simplifies the structure and improves configuration density by eliminating the need for reserved opening areas.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the light-shielding layer is electrically connected to the light-emitting element to serve as a signal line, then the device complexity is reduced and configuration density is improved, but the manufacturing precision requirements increase
Solution Approach 1:
The light-shielding layer is merged with the signal line function by electrically connecting it to the light-emitting element. This allows the light-shielding layer to simultaneously serve as both a light-shielding component and a signal transmission path, eliminating the need for separate reserved opening areas and reducing overall device complexity.
Solution Approach 2:
The light-shielding layer is designed to perform multiple functions: it shields light from reaching the sensing element directly, conducts electrical signals from the light-emitting element, and structurally integrates the sensing and light-emitting components. This multi-functionality reduces the number of separate components needed.
2Productivity
If the light angle control layer is electrically connected to pads of the light-emitting element to act as a signal line, then the configuration density is improved, but the device complexity increases
Solution Approach 1:
The light angle control layer is positioned between the light-shielding layer and the light-emitting element, utilizing the vertical dimension to control light angles. By electrically connecting this layer to the light-emitting element pads, it serves dual purposes of light angle control and signal transmission, improving configuration density through three-dimensional integration.
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 sensing effect and improves the integrated structure of the sensing device, allowing for a more efficient and compact arrangement of sensing and light-emitting elements.
Implementation Method 1
the light-emitting element emits visible light, and the visible light includes at least two color lights
Implementation Method 2
a light-shielding layer, located between the light-emitting element and the first sensing element
Implementation Method 3
the sensing element can generate currents with different magnitudes by detecting light rays reflected by the fingerprint of a finger
Implementation Method 4
a light angle control layer, located between the light-shielding layer and the light-emitting element
Data Source
AI summary
A sensing device, including a first substrate, a first sensing element, a light-emitting element, and a light-shielding layer, is provided. The first sensing element is located on the first substrate. The light-emitting element is located on the first sensing element. The light-shielding layer is located between the light-emitting element and the first sensing element, and is electrically connected to the light-emitting element.