Optimizing Insulator Layer Thickness for Sensor Radiation Transmission
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Solution Overview
Problem
Conventional mobile phone displays experience low radiation incidence on sensors due to poor transmission of infrared and visible radiation, leading to suboptimal performance of proximity and ambient light sensors.
Innovation Solution
Optimization of material layer thicknesses in the display, specifically using alternating layers of SiO2 and SiN, to enhance the transmission of radiation at wavelengths between 800 nm and 1000 nm, with a focus on achieving over 80% transmission at 940 nm, allowing improved performance of sensors without significant changes to manufacturing processes or materials.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional display manufacturing is used with standard material layer thicknesses, then manufacturing simplicity is maintained, but radiation transmission to sensors is insufficient
Solution Approach 1:
The patent optimizes the thickness parameters of existing insulator material layers (SiO2 and SiN) in the display structure to maximize radiation transmission at 940nm wavelength. By adjusting these physical parameters within the existing manufacturing framework, the patent achieves over 80% transmission without changing materials or manufacturing processes, thereby improving sensor performance while maintaining ease of manufacture
Solution Approach 2:
The patent utilizes a composite structure of alternating SiO2 and SiN insulator layers, where each material contributes different optical properties. This composite arrangement allows constructive interference of transmitted radiation at the target wavelength, achieving high transmission rates while maintaining the electrical insulation functionality of the original layers
2Reliability
If material layer thicknesses are optimized for radiation transmission, then transmission of infrared radiation is improved, but manufacturing precision requirements increase
Solution Approach 1:
The patent determines specific thickness values for SiO2 and SiN layers that optimize radiation transmission at 940nm. These parameters are calculated based on optical interference principles and can be integrated into existing manufacturing processes with standard precision capabilities, avoiding the need for ultra-precise manufacturing while achieving >80% transmission
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 significantly increases the transmission of infrared and visible radiation, enhancing the performance of proximity and ambient light sensors, leading to improved distance measurement and ambient light detection, and reducing battery consumption by optimizing the display's radiation handling capabilities.
Implementation Method 1
thicknesses of the layers are optimized to allow transmission of infrared radiation and/or visible radiation through the layers and onto the one or more sensors
Data Source
AI summary
A system comprises a display and one or more sensors, the one or more sensors being located beneath the display. The display comprises an array of light emitting diodes and associated transistors supported by a substrate. The display further comprises two or more layers of insulator material. The thicknesses of the layers are optimized to allow transmission of infrared radiation and/or visible radiation through the layers and onto the one or more sensors.