Dual Privacy Panels Reduce Viewing-Angle Leakage and Color Shift
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Solution Overview
Problem
Current privacy technologies in electronic devices, such as car monitors, suffer from bluish chromatic aberration and light leakage at large viewing angles, compromising driving safety.
Innovation Solution
An electronic device with dual privacy panels, each having specific alignment layers with parallel alignment axes and controlled angles between 160 to 200 degrees, and incorporating polarizers to minimize chromatic aberration and light leakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single privacy panel is used to provide privacy function, then privacy protection is achieved, but chromatic aberration and light leakage occur at large viewing angles
Solution Approach 1:
The patent divides the single privacy panel into two separate privacy panels (first privacy panel and second privacy panel) with different alignment directions. Each panel handles specific viewing angle ranges, thereby reducing chromatic aberration and light leakage while maintaining comprehensive privacy protection across all viewing angles.
Solution Approach 2:
The patent employs asymmetric alignment directions for the two privacy panels, where the first alignment layer and second alignment layer have different alignment directions. This asymmetric configuration allows each panel to optimize its performance for specific viewing angles, effectively reducing optical defects like chromatic aberration and light leakage.
2Reliability
If privacy mode is activated to protect driver's viewing angle, then privacy is improved, but bluish chromatic aberration appears at large viewing angles
Solution Approach 1:
The patent segments the privacy protection function into two panels with different alignment directions. The first privacy panel with first alignment layer handles one viewing angle range while the second privacy panel with second alignment layer handles another range, thereby eliminating bluish chromatic aberration that occurs in single-panel systems at large viewing angles.
Solution Approach 2:
The patent changes the alignment direction parameter between the two privacy panels. By setting different alignment directions for the first and second alignment layers, the system optimizes color accuracy across different viewing angles, specifically reducing bluish chromatic aberration in the driver's viewing angle range.
3Object-affected harmful factors
If dual privacy panels with specific alignment angles are used, then chromatic aberration and light leakage are reduced, but device structure becomes more complex
Solution Approach 1:
The patent merges the two privacy panels into a single integrated display structure where both panels share common components such as substrates, liquid crystal layers, and polarizers. This merging approach reduces device complexity by avoiding complete duplication of all components while still achieving the benefits of dual-panel configuration for reduced chromatic aberration and light leakage.
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 dual privacy panel design significantly reduces chromatic aberration and light leakage, enhancing privacy and safety by minimizing brightness and color shift at various viewing angles.
Implementation Method 1
The first privacy panel includes a first alignment layer and a second alignment layer opposite to each other. The second privacy panel includes a third alignment layer and a fourth alignment layer opposite to each other. The alignment axes of the first alignment layer, the second alignment layer, the third alignment layer and the fourth alignment layer are parallel.
Implementation Method 2
The first polarizer includes a first absorption axis parallel to an alignment axis of the first alignment layer. The second polarizer includes a second absorption axis parallel to an alignment axis of the second alignment layer.
Implementation Method 3
The first polarizer has an absorption axis parallel to the alignment axis of the first alignment layer. The absorption of polarized light by the polarizer controls the brightness and reduces light leakage in the driver's viewing angle range.
Data Source
AI summary
An electronic device is provided. The electronic device includes a first privacy panel and a second privacy panel disposed on the first privacy panel. The first privacy panel has a first alignment layer and a second alignment layer opposite each other. The second privacy panel has a third alignment layer and a fourth alignment layer opposite each other. The alignment axes of the first alignment layer, the second alignment layer, the third alignment layer and the fourth alignment layer are parallel. The angle between the alignment direction of the first alignment layer and the alignment direction of the third alignment layer is in a range from 160 to 200 degrees. The angle between the alignment direction of the second alignment layer and the alignment direction of the fourth alignment layer is in a range from 160 to 200 degrees.