Green Color Filter Layout for Sunlight-Resistant Optical Detection
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Solution Overview
Problem
Optical detection devices used in outdoor electronic devices, such as mobile terminals, face malfunctions due to sunlight interference, particularly in the wavelength range of 600 nm to 1100 nm, which affects their reliability in detecting biological information like fingerprints and veins.
Innovation Solution
Incorporating a green color filter supported by a support substrate between the photoelectric conversion element and the display panel, which transmits green light reflected from objects while shielding external light in the 600 nm to 750 nm range, thereby reducing optical noise and maintaining device reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a light-shielding layer is provided between the substrate and semiconductor layer to reduce optical noise, then the influence of optical noise is reduced, but the device complexity increases
Solution Approach 1:
A green color filter is introduced as an intermediary component between the photoelectric conversion element and the external environment. This color filter specifically transmits green light wavelengths while blocking other wavelengths, thereby reducing optical noise from sunlight without requiring complex multi-layer shielding structures.
Solution Approach 2:
The patent applies a green color filter that selectively transmits green light wavelengths. By utilizing the optical property of color filtering, the device allows desired green light to pass through while blocking unwanted wavelengths in the 600-1100 nm range, thereby reducing optical noise without increasing structural complexity.
2Adaptability or versatility
If the detection device is used in outdoor electronic devices, then the versatility is improved, but the reliability decreases due to sunlight interference
Solution Approach 1:
The patent converts the harmful effect of sunlight into a beneficial selective detection mechanism. By using a green color filter, the device selectively allows green light to pass through while blocking other wavelengths that cause interference. This enables the detection device to function reliably in outdoor environments by benefiting from the spectral characteristics of reflected light while rejecting harmful wavelengths.
3Reliability
If a green color filter is added to filter external light, then the reliability is improved, but the device complexity increases
Solution Approach 1:
The green color filter serves multiple functions simultaneously: it acts as a wavelength selector for the photoelectric conversion element, a shield against optical noise in the 600-1100 nm range, and an enabler for outdoor usability. By consolidating these functions into a single component, the patent improves reliability without proportionally increasing device complexity.
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
The solution effectively suppresses malfunctions caused by external light, ensuring the detection device's reliability by filtering out unwanted wavelengths and enhancing the detection of biometric information.
Implementation Method 1
a green color filter being a green color filter and supported by a support substrate, wherein the green color filter overlaps the photoelectric conversion element... shielding external light in the 600 nm to 750 nm range
Implementation Method 2
a photoelectric conversion element provided on the substrate and including a semiconductor layer... configured to detect light reflected by an object
Data Source
AI summary
According to one embodiment, a detection device includes a substrate, a photoelectric conversion element provided on the substrate and including a semiconductor layer, a transistor provided to correspond to the photoelectric conversion element, a support substrate, and a color filter being a green color filter and supported by the support substrate, wherein the color filter overlaps the photoelectric conversion element.