Transparent Conductive Layer for Optical Sensor Noise Reduction
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Solution Overview
Problem
Electromagnetic waves in environments cause electromagnetic induction with metal circuits in optical sensing apparatuses, leading to electromagnetic noise, reduced signal-to-noise ratio, and impaired optical detection accuracy and user experience.
Innovation Solution
Incorporating a transparent conductive layer above the sensor chip and connected to its grounding terminal, which couples with environmental electromagnetic waves and eliminates noise by grounding, while maintaining the original incident light amount.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a metal circuit is used in the optical sensing apparatus, then electrical conductivity and signal transmission are improved, but electromagnetic noise is generated due to electromagnetic induction with environmental electromagnetic waves
Solution Approach 1:
The patent introduces a transparent conductive layer as an intermediary between the metal circuit and the environmental electromagnetic waves. This layer has intermediate conductivity that allows it to interact with electromagnetic waves and redirect them to grounding terminals, thereby protecting the underlying metal circuit from direct electromagnetic induction while maintaining electrical functionality
Solution Approach 2:
The patent converts the harmful electromagnetic noise into a beneficial effect by using the transparent conductive layer to guide environmental electromagnetic waves toward grounding terminals. The same electromagnetic waves that would normally induce noise in the metal circuit are instead channeled through the transparent conductive layer to the grounding terminals, where they are safely dissipated
2Measurement precision
If a conductive shielding layer is added to reduce electromagnetic noise, then signal-to-noise ratio is improved, but light transmittance is reduced
Solution Approach 1:
The patent changes the material parameter of the conductive layer from traditional opaque metal to transparent conductive material (such as ITO, IZO, or AZO). This parameter change allows the layer to maintain electrical conductivity for electromagnetic noise suppression while simultaneously allowing light to pass through, thus resolving the contradiction between noise reduction and light transmittance
Solution Approach 2:
The patent uses composite material structure combining transparent conductive oxide layers with specific thickness control (50-200 nm) to achieve both optical transparency and electrical conductivity. This composite approach allows the shielding layer to function as both an optical window and an electromagnetic interference shield
3Object-affected harmful factors
If the transparent conductive layer thickness is increased to improve electromagnetic shielding, then noise reduction is improved, but light transmittance is reduced
Solution Approach 1:
The patent precisely controls the thickness parameter of the transparent conductive layer within the range of 50-200 nm. This parameter optimization achieves the best balance between electromagnetic shielding effectiveness and optical transmittance, where the layer is thick enough to interact with electromagnetic waves but thin enough to allow sufficient light passage
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 improves the signal-to-noise ratio, reduces operating noise, and enhances optical detection accuracy and user experience by effectively addressing electromagnetic interference.
Implementation Method 1
an electromagnetic wave in an environment can be coupled with the transparent conductive layer above the sensor chip, and an electromagnetic coupling noise generated therefrom can be eliminated by grounding
Data Source
AI summary
An optical sensing apparatus, a method for manufacturing an optical sensing apparatus, and an electronic device can improve the optical detection accuracy and user experience. The optical sensing apparatus includes: a sensor chip configured to receive an incident light signal for optical detection; and a transparent conductive layer provided above the sensor chip and connected to a grounding terminal of the sensor chip, where the transparent conductive layer is configured to be coupled with an electromagnetic wave in an environment, and transmit the electromagnetic wave to the grounding terminal of the sensor chip.