Optical Bandpass Filter for Light Detection Signal Accuracy
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Solution Overview
Problem
Existing light detection apparatuses face challenges in accurately detecting physiological features due to reduced intensity and distortion of reflected optical signals, leading to inaccurate information collection, especially in display panel technologies where signal-to-noise ratios are low.
Innovation Solution
A light detection apparatus comprising a nonopaque cover plate, a display, and a photosensor, with an optical bandpass filter that filters and transmits specific wavelengths, enhancing the signal-to-noise ratio and improving image accuracy by selectively transmitting light with specific incident angles and wavelengths, thereby improving the collection of physiological feature information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an existing light detection apparatus detects physiological feature information using reflected optical signals, then the detection function is integrated with the display, but the intensity of the reflected optical signal is severely reduced and grains of collected information are hard to distinguish
Solution Approach 1:
The patent introduces an optical bandpass filter as an intermediary component between the display and photosensor. This filter selectively transmits only the wavelength range of the reflected optical signal while blocking other wavelengths, thereby enhancing the signal-to-noise ratio and improving the intensity and distinguishability of the reflected optical signal without compromising detection accuracy
Solution Approach 2:
The patent changes the optical parameters by introducing a bandpass filter with specific wavelength transmission characteristics. This parameter change allows selective transmission of the reflected optical signal at specific wavelengths, enhancing signal intensity and enabling accurate distinction of physiological feature information grains
2Measurement precision
If optical signals transmit through a multilayer structure of the display, then the display structure is maintained, but the signal-to-noise ratio is low and useful optical signals are difficult to extract
Solution Approach 1:
The optical bandpass filter serves as a mediator that simplifies the complex multilayer optical path by selectively transmitting only the relevant wavelength range. This intermediary component filters out unwanted wavelengths generated by the multilayer structure, thereby improving the signal-to-noise ratio and enabling extraction of useful optical signals
Solution Approach 2:
By changing the optical wavelength parameter through the bandpass filter, the patent selectively transmits only the specific wavelength range corresponding to the reflected optical signal. This parameter change effectively separates the useful signal from the noise generated by the multilayer display structure, improving measurement precision
3Measurement precision
If an optical bandpass filter is introduced to filter and transmit specific wavelengths, then the signal-to-noise ratio is enhanced and image accuracy is improved, but the device structure becomes more complex
Solution Approach 1:
The optical bandpass filter is introduced as a necessary intermediary component to achieve the desired image accuracy. Although it adds structural complexity, the filter is essential for selectively transmitting the reflected optical signal and blocking other wavelengths, thereby achieving the improvement in measurement precision and image accuracy
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 apparatus effectively filters out ambient and stray light, enhances data quality, and improves the accuracy of physiological feature identification by constructing a complete and accurate image of ridges and valleys, such as in fingerprints, through precise analysis of the reflected optical signals.
Implementation Method 1
an optical bandpass filter configured to transmit a light with an incident angle and a wavelength satisfying a bandpass condition and to filter other light that does not satisfy the bandpass condition
Implementation Method 2
the optical signal is reflected on an upper surface of the nonopaque cover plate to form a reflected optical signal
Data Source
AI summary
The present disclosure provides a light detection apparatus and application thereof. The apparatus includes: a nonopaque cover plate, a display, and a photosensor, and further including a processor configured to transmit a display driving signal to the display when the apparatus detects a touch signal on the apparatus; wherein the display includes a plurality of display pixels configured to emit an optical signal when receiving the display driving signal transmitted by the processor, and the optical signal is reflected on an upper surface of the nonopaque cover plate to form a reflected optical signal; and wherein the reflected optical signal is received by the photosensor. By some embodiments of the present disclosure, obtained physiological feature information can be more accurate and identification precision can be effectively improved.