Under-Display Camera Polarizer for Screen Light Interference
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Solution Overview
Problem
Current mobile phone designs face challenges in achieving a true 100% screen ratio due to screen light interference with front cameras, leading to reduced natural light acquisition and blurry photos, as displays have low transmittance and emit light that affects off-screen camera photography results.
Innovation Solution
An imaging device is installed under the display with a first and second polarizer part, where the second polarizer part is oriented at a preset angle relative to the first, allowing only screen light to be received by the second light sensor element, effectively filtering out ambient light, and a processor processes data from both light sensor elements to isolate and utilize ambient light for improved photography.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the display transmittance is increased to improve natural light acquisition, then the screen ratio can be increased, but the screen light emission that interferes with the front camera becomes more severe
Solution Approach 1:
A polarizing filter is introduced as an intermediary component between the display and the front camera. This polarizer selectively transmits or blocks light based on its polarization orientation, enabling the system to distinguish between screen light (which passes through the display's polarizer) and ambient light (which does not), thereby resolving the interference issue while maintaining high screen ratio
Solution Approach 2:
The solution changes the polarization parameter of the light by introducing a polarizing filter with a specific orientation angle (e.g., 45 degrees or perpendicular to the display's polarizer). This parameter change enables selective filtering of screen light while allowing ambient light to pass through to the camera sensor
2Area of stationary object
If the display transmittance is increased to improve ambient light acquisition, then the screen ratio can be increased, but the photographing results become blurry due to insufficient light separation
Solution Approach 1:
The polarizing filter acts as an optical intermediary that separates screen light from ambient light based on their different polarization states. This enables the camera to capture clear images by selectively blocking screen light while transmitting ambient light, thereby improving photographing quality without compromising screen ratio
Solution Approach 2:
The solution applies different optical properties to different light paths: screen light is blocked by the polarizer while ambient light is transmitted. This local differentiation of light handling enables high screen ratio while maintaining clear photographing results through selective light separation
3Measurement precision
If a polarizer is added to filter screen light, then the photographing quality is improved, but the device complexity increases
Solution Approach 1:
The polarizing filter serves multiple functions simultaneously: it blocks screen light from reaching the camera, allows ambient light to pass through, and can be integrated into the existing display structure. This multi-functionality improves photographing quality while minimizing the increase in device complexity
4Illumination intensity
If the display emits more light to improve visibility, then the screen brightness is increased, but the interference with the front camera becomes more severe
Solution Approach 1:
The polarizing filter is positioned between the display and camera to act as an intermediary that blocks the harmful screen light while allowing useful ambient light to reach the sensor. This enables the display to emit more light for better visibility without increasing camera interference, as the polarizer selectively filters the light based on its polarization state
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
This solution enhances the photography results by ensuring that only ambient light is used for image generation, reducing the whitish and blurry effects caused by screen light, while maintaining efficient processing and power consumption, thus improving user experience.
Implementation Method 1
a first polarizer part of the display... the first light sensor element receives screen light emitted by the display and first polarized ambient light incident through the first polarizer part
Implementation Method 2
a second polarizer part provided upstream of the at least one second light sensor element... polarization orientation of the first polarizer part is at a preset angle with respect to polarization orientation of the second polarizer part
Data Source
AI summary
An imaging device, to be installed under a display having a first polarizer part, includes: at least one first light sensor element; at least one second light sensor element; and a second polarizer part provided upstream of the at least one second light sensor element along a direction in which light is incident on the at least one second light sensor element, wherein polarization orientation of the first polarizer part is at a preset angle with respect to polarization orientation of the second polarizer part; the at least one first light sensor element receives screen light emitted by the display and first polarized ambient light incident through the first polarizer part; and the at least one second light sensor element receives the screen light emitted by the display and second polarized ambient light incident through the first polarizer part and the second polarizer part.