Frameless Auto-Dimming Rearview Mirror to Eliminate Ghosting
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Solution Overview
Problem
Traditional auto-dimming rear view mirrors suffer from issues such as ghosting, low display brightness, high cost, complex installation, low adaptability, lack of automatic dimming function, slow dimming speed, and are often framed, which reduces the visual area and affects aesthetics.
Innovation Solution
A frameless auto-dimming rear view mirror design featuring an absorptive-type polarizing layer, a liquid crystal dimming layer, and a reflective-type polarizing layer, with an electrode connecting line and ink layer to conceal the frame glue, and a control unit for automatic dimming, enhancing the mirror surface utilization and eliminating ghosting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a frame is added to the rear view mirror, then the structural strength and assembly ease are improved, but the visual area and aesthetics deteriorate
Solution Approach 1:
The patent removes the traditional frame structure from the rear view mirror, extracting only the essential functional components (polarizing layers, liquid crystal layer, transparent substrates) to create a frameless design. This eliminates the visual obstruction caused by frames while maintaining structural integrity through the layered optical components.
Solution Approach 2:
The patent uses thin transparent substrates and flexible polarizing films to replace the rigid frame structure. These thin film components provide the necessary structural support and optical functionality without the bulk and visual obstruction of traditional frames, allowing for a cleaner, more aesthetic design.
2Ease of manufacture
If traditional glass mirror is used, then the manufacturing simplicity is maintained, but the ghosting phenomenon occurs
Solution Approach 1:
The patent employs a composite structure consisting of multiple functional layers: absorptive-type polarizing layer, liquid crystal dimming layer, reflective-type polarizing layer, and transparent substrates. This composite material approach eliminates ghosting by controlling light polarization and reflection, while the modular layered structure simplifies manufacturing through standardized assembly processes.
Solution Approach 2:
The patent changes the optical parameters of the mirror by introducing polarizing layers with specific absorption and reflection characteristics. The liquid crystal layer dynamically adjusts its optical properties (transmittance, reflectance) based on applied voltage, eliminating ghosting while maintaining manufacturing feasibility through controlled material properties.
3Ease of operation
If the mirror surface is reduced to accommodate frames and connections, then the assembly ease is improved, but the mirror surface efficiency deteriorates
Solution Approach 1:
The patent moves the electrode connecting lines from the front visible surface to the rear side or edges of the mirror assembly. This dimensional relocation allows the entire front surface to be utilized as effective mirror area, eliminating the need to reduce mirror dimensions for connection access while maintaining assembly ease through rear-side wiring.
4Device complexity
If manual dimming control is used, then the device complexity is reduced, but the automation level deteriorates
Solution Approach 1:
The patent incorporates light sensors that detect ambient light conditions and provide feedback to the control unit. The control unit automatically adjusts the liquid crystal layer's voltage state based on this feedback, enabling automatic dimming functionality. This feedback mechanism adds minimal complexity while achieving high automation in the dimming control process.
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 frameless design eliminates ghosting, provides fast dimming speed, and improves mirror surface efficiency, while the production method is simplified and cost-effective, offering improved aesthetics and functionality compared to traditional streaming media rear view mirrors.
Implementation Method 1
a liquid crystal dimming layer and a reflective-type polarizing layer arranged in sequence
Implementation Method 2
the liquid crystal dimming layer comprises a first transparent substrate, a first transparent electrode, a first alignment layer, a liquid crystal layer
Implementation Method 3
an absorptive-type polarizing layer, a liquid crystal dimming layer and a reflective-type polarizing layer arranged in sequence
Data Source
AI summary
A frameless auto-dimming rear view mirror, including an absorptive-type polarizing layer, a liquid crystal dimming layer and a reflective-type polarizing. The liquid crystal dimming layer includes a first transparent substrate, a first transparent electrode, a first alignment layer, a liquid crystal layer, a second alignment layer, a second transparent electrode and a second transparent substrate arranged in sequence. The first transparent substrate is adjacent to the absorptive-type polarizing layer, and its position corresponds to the position of the second transparent substrate, and the first transparent substrate is provided with a step which is beyond the position of the second transparent substrate at its edge. The frameless auto-dimming rear view mirror also includes an electrode connecting line electrically connected with the first transparent electrode and the second transparent electrode respectively, and is located at the step and fixed on the side of the first transparent substrate facing the second transparent substrate.