Under-Display Camera Optics Using Polarization to Block Reflections
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Solution Overview
Problem
Current display systems with integrated camera modules suffer from reflection issues and diminished performance due to the use of circular polarizers and haze layers, which affect the aesthetic appeal and functionality of the device.
Innovation Solution
A display system design incorporating a quarter wave plate between the display panel and a linear polarizer, with an optical layer between the polarizer and the cover layer, to block reflected display and ambient light from entering the camera module, using a quarter wave plate and optical layer to manage light polarization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a circular polarizer and haze layer are placed between the camera module and display panel to reduce reflection, then reflection issues are mitigated, but camera module performance and display panel brightness are significantly reduced
Solution Approach 1:
The patent changes the polarization state parameters by using a linear polarizer instead of a circular polarizer, and positions it on the camera module side rather than the display panel side. This parameter change allows the system to block reflected light while maintaining camera performance and display brightness.
Solution Approach 2:
Instead of placing the polarizer on the display panel side (conventional approach), the patent inverts the arrangement by placing the linear polarizer on the camera module side. This inversion allows the polarizer to directly filter reflected light before it enters the camera sensor, improving camera performance while still reducing reflections.
2Object-affected harmful factors
If a circular polarizer and haze layer are placed between the camera module and display panel to reduce reflection, then reflection issues are mitigated, but display panel brightness is significantly reduced
Solution Approach 1:
The patent changes the polarization configuration from circular to linear and repositions the polarizer on the camera module side. This parameter change allows display light to pass through the display panel and cover lens with minimal attenuation, maintaining display brightness while still blocking reflected light through the linear polarizer's selective filtering.
3Length of stationary object
If the camera module is integrated beneath the display using Under Display Camera technology, then bezel thickness is reduced, but aesthetic appeal is compromised due to non-display areas
Solution Approach 1:
The patent makes the entire display area functional by enabling the camera to capture images through any region of the display, not just through a designated non-display area. The linear polarizer allows the camera to receive light from the entire display surface, converting the display into a universal imaging window and eliminating the need for aesthetic-compromising blank areas.
4Length of stationary object
If the camera module is integrated beneath the display using Under Display Camera technology, then bezel thickness is reduced, but reflection problems caused by the cover layer are not effectively mitigated
Solution Approach 1:
The patent introduces a linear polarizer as an intermediary element positioned on the camera module side. This polarizer acts as a mediator that selectively blocks reflected light from the cover lens while allowing direct display light to pass through, effectively mitigating reflection problems without requiring changes to the cover layer or display structure.
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 blocks reflected light within the display system, enabling clear image capture by the camera module and enhancing the viewing experience without compromising the device's appearance.
Implementation Method 1
The quarter wave plate is disposed between the display panel and the linear polarizer
Implementation Method 2
the linear polarizer, an optical layer, and a cover layer. The camera module is disposed on one side of the display panel
Implementation Method 3
the display light emitted by the display panel may be blocked by the optical film assembly after being reflected by the cover layer
Data Source
AI summary
Disclosed is a display system including a display panel, a camera module, a quarter wave plate, a linear polarizer, an optical layer and a cover layer. The camera module is disposed on one side of the display panel and disposed in a display area of the display panel. The quarter wave plate is disposed on the other side of the display panel opposite to the camera module. The quarter wave plate is disposed between the display panel and the linear polarizer. The optical layer is disposed between the linear polarizer and the cover layer.