Louvered Display Light Control for Vehicle Viewing Angle Privacy
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Solution Overview
Problem
Existing display devices face issues with controlling the viewing angle of images displayed on vehicle displays, which can interfere with driving at night and compromise privacy by reflecting images on windshields, necessitating improved light control layers.
Innovation Solution
A display device with a light control layer comprising a louver layer and louver support layer alternately arranged with transmissive and light blocking layers, where the louver layer has a greater height than the light blocking layers, and includes optical patterns between the light blocking patterns to control viewing angles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a light control layer is added to control viewing angles, then privacy protection and anti-glare performance are improved, but device complexity increases
Solution Approach 1:
The light control layer is segmented into multiple functional sub-layers: a louver layer with inclined structures for viewing angle control, a light blocking layer with patterns for privacy protection, and a light diffusing layer for uniform light distribution. Each layer performs a specific function, allowing the system to achieve comprehensive light control while maintaining manageable complexity through functional decomposition.
Solution Approach 2:
The light control layer employs composite material structures combining different optical properties. The louver layer uses transparent or translucent materials with specific refractive indices, the light blocking layer uses opaque materials with high absorption coefficients, and the light diffusing layer uses materials with scattering properties. This composite approach enables simultaneous achievement of viewing angle control, privacy protection, and uniform light distribution.
2Manufacturing precision
If multiple light blocking layers are used to control viewing angles, then viewing angle control precision is improved, but light loss increases
Solution Approach 1:
The louver layer incorporates adjustable or flexible structures that can dynamically change their orientation or density based on environmental conditions. This dynamic adjustment allows the system to optimize viewing angle control precision while minimizing light loss by adapting the degree of light blocking to actual usage scenarios rather than using fixed, overly restrictive structures.
Solution Approach 2:
The patent optimizes parameters such as the pitch, width, and inclination angle of the louver structures, as well as the pattern density of the light blocking layer. By carefully tuning these parameters, the system achieves precise viewing angle control (e.g., limiting viewing angles to within ±30 degrees) while minimizing the total light blocking area, thereby reducing light loss and maintaining sufficient brightness.
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
Enhances the reliability of the light control layer by effectively managing viewing angles, reducing interference with driving and protecting privacy by controlling the reflection of images on vehicle displays.
Implementation Method 1
a louver layer and a louver support layer on the light emitting element layer and arranged alternately with each other
Implementation Method 2
a first light blocking layer on the first transmissive layer and including a plurality of light blocking patterns spaced apart from each other
Data Source
AI summary
A display device includes: a substrate; a light emitting element layer on the substrate and including light emitting elements; and a light control layer on the light emitting element layer and including: a louver layer and a louver support layer on the light emitting element layer and arranged alternately with each other; a first transmissive layer on the louver layer and the louver support layer; a first light blocking layer on the first transmissive layer and including light blocking patterns spaced apart from each other; a second transmissive layer on the first transmissive layer and the first light blocking layer; and a second light blocking layer on the second transmissive layer and including light blocking patterns spaced apart from each other, and wherein a height of the louver layer is greater than a height of the first light blocking layer and a height of the second light blocking layer.