Display Device Optical Component Wavelength Filtering
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Solution Overview
Problem
Exposed sensors in electronic devices can cause an unpleasant feeling of being monitored and affect image quality due to light absorption by light shielding layers.
Innovation Solution
An optical sensing unit is embedded in the display panel with an optical component that filters visible light and allows non-visible light to pass, reducing visibility and interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a light shielding layer is used to hide the sensor, then the visibility of the sensor is reduced, but the image quality is affected because the light shielding layer absorbs visible light
Solution Approach 1:
The patent applies parameter changes by using an optical component with specific wavelength-dependent transmittance characteristics. The component has low transmittance (less than 10%) for visible light wavelengths (380-780 nm) to hide the sensor, while maintaining high transmittance (greater than 70%) for near-infrared wavelengths (900-1100 nm) to ensure image quality. This resolves the contradiction by changing the optical parameters based on wavelength rather than using a uniform light shielding layer.
Solution Approach 2:
The patent employs composite materials by integrating an optical component with specific wavelength-selective properties into the display device. This composite structure combines the functions of sensor visibility reduction and image quality maintenance through its dual transmittance characteristics across different wavelength ranges, effectively resolving the contradiction between hiding the sensor and preserving image quality.
2Object-affected harmful factors
If an optical component with low visible light transmittance is used, then sensor visibility is reduced, but non-visible light transmission must be maintained
Solution Approach 1:
The patent resolves this contradiction by changing the optical parameters of the component based on wavelength. The component is designed with low transmittance (less than 10%) for visible light (380-780 nm) to reduce sensor visibility, while simultaneously maintaining high transmittance (greater than 70%) for near-infrared light (900-1100 nm) to ensure proper sensor function. This wavelength-dependent parameter change allows both requirements to be satisfied simultaneously.
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 reduces the visibility of the optical sensing unit while maintaining image quality by minimizing visible light interference and enhancing non-visible light transmission.
Implementation Method 1
A transmittance of the optical component to light with a wavelength greater than or equal to 380 nm and less than or equal to 780 nm is less than 10%, and a transmittance of the optical component to light with a wavelength greater than or equal to 900 nm and less than or equal to 1100 nm is higher than 70%
Data Source
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AI summary
A display device (1) includes a display panel (10), an optical sensing unit (11), and an optical component (13). The optical sensing unit (11) is embedded in the display panel (10) and is located in a peripheral region (R1) of the display device (1). The optical component (13) is adjacent to a light entrance side (S11) of the optical sensing unit (11). A transmittance of the optical component (13) to light (L1) with a wavelength greater than or equal to 380 nm and less than or equal to 780 nm is less than 10%, and a transmittance of the optical component (13) to light (L2) with a wavelength greater than or equal to 900 nm and less than or equal to 1100 nm is higher than 70%.