Electro-Optic Mirror Display System with Switchable Grating
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Solution Overview
Problem
Existing electro-optic assemblies in vehicular and building applications are limited by cost, aesthetics, and functionality, particularly in their ability to switch between mirror and display states effectively.
Innovation Solution
A vehicle display mirror system incorporating an electro-optic device with a cavity containing a variably transmissive medium, coupled with a substantially transparent display featuring a switchable output grating to selectively diffract light, allowing the system to transition between clear and darkened states for both mirror and display functions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If an electro-optic assembly is used in vehicular applications, then the display functionality is provided, but the cost and aesthetic quality are limited
Solution Approach 1:
The patent combines the mirror function and display function into a single integrated assembly. The electro-optic assembly includes a mirror substrate with an electro-optic layer that can switch between reflective mirror mode and transparent display mode, eliminating the need for separate mirror and display components. This merging reduces overall system cost while providing dual functionality.
Solution Approach 2:
The electro-optic assembly is designed to perform multiple functions: it acts as a reflective mirror when the electro-optic layer is in its reflective state, and as a transparent display substrate when switched to transparent state. This multi-functionality allows a single component to replace what would traditionally require separate mirror and display elements, improving cost-effectiveness.
2Adaptability or versatility
If an electro-optic assembly is used in vehicular applications, then the display functionality is provided, but the aesthetic quality is limited
Solution Approach 1:
The patent applies different optical properties to different regions and layers of the assembly. The mirror substrate provides reflective properties, while the electro-optic layer provides switchable transparency. This local differentiation of optical qualities allows the assembly to maintain aesthetic mirror appearance when needed while enabling display functionality when required.
Solution Approach 2:
The electro-optic layer can change its optical properties including transparency and reflectivity states. This ability to change optical appearance allows the assembly to maintain aesthetic quality by appearing as a traditional mirror when not in use, while enabling display functionality when activated, thus resolving the aesthetic limitation.
3Adaptability or versatility
If the electro-optic device switches between mirror and display states, then the versatility is improved, but the device complexity increases
Solution Approach 1:
The patent integrates the mirror substrate and electro-optic layer into a single compact assembly, reducing the complexity that would arise from having separate mirror and display systems. The switching mechanism is built into the layered structure itself, requiring only control of the electro-optic layer's state rather than complex mechanical or optical switching mechanisms.
Solution Approach 2:
The patent uses an electro-optic effect to control the switching between mirror and display states, replacing what would traditionally require mechanical moving parts or complex optical switching mechanisms. This electrical control method simplifies the device structure and reduces mechanical complexity while maintaining versatility.
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
Enables a versatile and cost-effective solution that enhances visibility and functionality by allowing the system to function as both a mirror and a display, improving user experience while maintaining aesthetic considerations.
Implementation Method 1
An electro-optic medium is disposed in a cavity between the first and second substantially transparent substrates. The electro-optic medium is variably transmissive such that the electro-optic device is operable between a substantially clear state and a darkened state.
Implementation Method 2
The substantially transparent display further comprises a waveguide comprising a diffractive element. The diffractive element is configured to selectively extract the light from the waveguide outputting visual light data on the transparent display.
Implementation Method 3
In a first display state, reflecting a rearward directed view in a projection direction through a transparent waveguide display from a mirror surface.
Data Source
AI summary
A vehicle display mirror system is disclosed. The system comprises an electro-optic device configured to switch between a mirror state and a display state. The electro-optic device comprises a first substrate and a second substrate forming a cavity. The cavity is configured to retain an electro-optic medium that is variably transmissive such that the electro-optic device is operable between substantially clear and darkened states. The system further comprises a substantially transparent display disposed adjacent to the electro-optic device. The substantially transparent display comprises a switchable output grating configured to selectively diffract light outward from the waveguide.