Embedded Display Sensor Filtering for Low-Visibility IR Sensing
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Solution Overview
Problem
In electronic devices, exposed sensors can create an unpleasant feeling of being monitored, while light shielding layers used to hide sensors can affect image quality by absorbing visible light.
Innovation Solution
A display device with an optical sensing unit embedded in the display panel, located in a peripheral region, and an optical component adjacent to the light entrance side of the sensing unit. The optical component has a transmittance of less than 10% for visible light (380 nm - 780 nm) and higher than 70% for non-visible light (900 nm - 1100 nm).
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 optical component is designed with wavelength-dependent transmittance characteristics, where it blocks visible light (380-780 nm) to hide the sensor but transmits near-infrared light (900-1100 nm) to maintain image sensing quality. This local differentiation of optical properties at different wavelengths resolves the contradiction between sensor concealment and imaging performance.
Solution Approach 2:
The optical component's transmittance parameter is specifically engineered to vary with wavelength: transmittance for visible light is less than 10% while transmittance for near-infrared light is greater than 70%. This parameter change across different spectral ranges allows the same component to simultaneously achieve sensor hiding and image quality preservation.
2Object-affected harmful factors
If visible light is blocked to reduce sensor visibility, then the sensor is better concealed, but less light is available for image sensing
Solution Approach 1:
The solution extends the optical sensing operation from the visible spectrum to the near-infrared spectrum. By operating in this different dimensional wavelength range, the system can block visible light for concealment while maintaining adequate light energy for sensing through high transmittance in the infrared range.
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 reduces the visibility of the sensor while maintaining image quality by effectively filtering visible light and allowing non-visible light to pass through, thereby minimizing interference with image sensing.
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
AI summary
A display device includes a display panel, an optical sensing unit, and an optical component. The optical sensing unit is embedded in the display panel and is located in a peripheral region of the display device. The optical component is adjacent to a light entrance side of the optical sensing unit. 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%.