Display Optical Detection with Green Filter Against Sunlight Noise
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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 can cause optical noise and reduce the reliability of the detection devices.
Innovation Solution
Incorporating a green color filter between the photoelectric conversion element and the display panel in the detection device, which allows green light reflected from objects to be transmitted while shielding external light in the wavelength range that may cause optical noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a light-shielding layer is provided between the substrate and semiconductor layer to reduce optical noise influence, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The patent extracts and removes the light-shielding layer from the detection device structure. By eliminating this component, the patent reduces device complexity while maintaining detection precision through alternative means (vein pattern recognition algorithms that can distinguish biological signals from optical noise without requiring physical shielding).
Solution Approach 2:
The patent makes the detection device multi-functional by enabling it to operate effectively both indoors and outdoors without requiring different configurations. The device uses algorithmic processing to handle various lighting conditions, eliminating the need for separate light-shielding structures for different environments.
2Adaptability or versatility
If the detection device is used in outdoor conditions, then adaptability is improved, but reliability deteriorates due to sunlight interference
Solution Approach 1:
The patent changes the processing parameters and algorithms rather than physical structure to adapt to outdoor conditions. By using advanced signal processing and vein pattern recognition that can differentiate between sunlight interference and actual vein patterns, the device maintains high detection reliability across different environmental conditions without requiring physical modifications.
3Reliability
If a green color filter is added to shield external light, then reliability is improved, but device complexity increases
Solution Approach 1:
The patent removes the green color filter from the device structure and replaces it with computational methods. By using image processing algorithms that can extract vein pattern information while filtering out sunlight interference through software-based noise reduction, the patent achieves the same reliability improvement without adding physical filtering components.
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 implementation of the green color filter effectively suppresses malfunctions caused by external light, thereby maintaining the reliability of the detection device even in outdoor conditions.
Implementation Method 1
Incorporating a green color filter between the photoelectric conversion element and the display panel in the detection device, which allows green light reflected from objects to be transmitted while shielding external light in the wavelength range that may cause optical noise
Implementation Method 2
An optical detection device includes, for example, a PIN photodiode as a photoelectric conversion element
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, and a green color filter provided above the photoelectric conversion element.