Display Polarization Retarders for Window Reflection Control
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Solution Overview
Problem
In vehicles and other optical arrangements, reflections from optically transmissive materials, such as windows, cause distractions due to bright internal display reflections, and existing solutions are either ineffective or costly due to the need for additional components.
Innovation Solution
A method and device using optical retarders to control the polarization state of light output from a display panel, ensuring that light rays reflected from optically transmissive surfaces are p-polarized, minimizing reflections by leveraging the lower reflectivity of p-polarized light compared to s-polarized light.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If highly directional display devices are used to minimize reflections, then reflection control is improved, but device complexity and manufacturing cost increase
Solution Approach 1:
The patent changes the polarization parameter of light by introducing optical retarders that modify the polarization state of light rays. By controlling the polarization angle of reflected rays to align with p-polarization, the reflectivity is reduced without requiring highly directional display devices, thus resolving the contradiction between reflection control and device complexity
Solution Approach 2:
The patent introduces optical retarders as intermediary components between the display device and the optically transmissive material. These retarders mediate the polarization state of light, enabling reflection control through a simpler mechanism rather than requiring complex highly directional display hardware
2Object-affected harmful factors
If optical retarders are used to control polarization state, then reflection is reduced, but device complexity increases
Solution Approach 1:
The patent employs relatively simple and inexpensive optical retarders rather than complex highly directional display devices. These retarders are straightforward optical components that can be integrated into existing display systems, providing cost-effective reflection control without significant increases in device complexity
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
Significantly reduces reflections from optically transmissive surfaces, improving visibility for drivers and passengers by minimizing glare from windows while maintaining the desired polarization state for optimal viewing conditions.
Implementation Method 1
this method makes use of the reflection sensitivity of linearly polarized light resulting from Fresnel reflection at the surface
Implementation Method 2
A method and device using optical retarders to control the polarization state of light output from a display panel
Data Source
AI summary
Reflections from a display device are controlled using retarders arranged on the output side of a display panel which outputs light with a predetermined polarization state. First and second planes of incidence are defined in respect of first and second rays of light output from the device and first and second normals to first and second surfaces of optically transmissive material at first and second points at which the first and second rays of light are reflected. The retarders are selected to cause the polarization state of the first ray to be linearly polarized in a direction that is in the first plane of incidence, and to cause the polarization state of the second ray to be linearly polarized in a direction that is in the second plane of incidence. The reflections from the surfaces are minimized because for both surfaces the polarization direction is in-plane.