Vehicle Display Light Control for Windshield Reflection Reduction
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Solution Overview
Problem
Light emitted by vehicle display devices can cause reflections on windshields and windows, affecting a driver's line of sight and compromising driving safety.
Innovation Solution
A display device with a light controlling means that directs first light at an angle of 30 to 45 degrees towards a transflective object and second light at 0 to 5 degrees, maintaining a light intensity ratio of less than or equal to 14%, thereby reducing reflections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If light is emitted by the display device, then the display function is improved, but light reflections on windshields and windows increase, obstructing the driver's view
Solution Approach 1:
The patent applies local quality by directing light at different angles in different regions of the display device. Specifically, light in the first region (adjacent to transflective object) is emitted at 30-45 degrees, while light in other regions is emitted at 0-5 degrees. This spatial differentiation of light emission characteristics reduces reflections on windshields and windows while maintaining display visibility in different viewing zones.
Solution Approach 2:
The patent changes the light emission angle parameter to resolve the contradiction. By controlling the light emission angle to be 30-45 degrees in the first region and 0-5 degrees in other regions, the patent optimizes the balance between display visibility and reflection reduction. Additionally, the light intensity ratio parameter is controlled to be 14% or less to further minimize harmful reflections.
2Object-affected harmful factors
If light intensity ratio of first light to second light is reduced to 14% or less, then reflections from transflective objects are minimized, but display visibility may be affected
Solution Approach 1:
The patent maintains display visibility by providing different light characteristics in different regions. The first region (adjacent to transflective object) emits light at 30-45 degrees with controlled intensity ratio, while other regions emit light at 0-5 degrees. This ensures that drivers can see the display clearly from normal viewing positions while reflections are minimized in the direction of the windshield.
Solution Approach 2:
The patent resolves the contradiction by adding the angular dimension to light emission control. Instead of uniformly reducing light intensity across all directions, the patent controls light emission in different angular directions (30-45 degrees vs. 0-5 degrees relative to normal direction). This allows the display to maintain visibility for drivers while minimizing reflections at specific angles toward the windshield.
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
Reduces light reflections from transflective objects, enhancing driving safety by controlling light propagation angles and intensities.
Implementation Method 1
light emitted by the vehicle display device may cause reflections after being reflected by a windshield or car windows
Data Source
AI summary
A display device includes a light emitting element disposed in a region adjacent to a transflective object in a vehicle and a light controlling means disposed on a route that a first light and a second light emitted from the light emitting element propagate. The first light is controlled to propagate out of the display device at a first angle ranged from 30 to 45 degrees and toward the transflective object and the second light is controlled to propagate out of the display device at a second angle ranged from 0 to 5 degrees. The first angle and the second angle are between a normal direction of the display device and the first light and the second light controlled through the light controlling means respectively. A first ratio of a light intensity of the first light to that of the second light is less than or equal to 14%.