External Display Louver Layer for Sunlight Reflection Rejection
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Solution Overview
Problem
External vehicle displays face challenges in maintaining image contrast and visibility due to sunlight reflections, which degrade the ability to discern content in bright sunlight conditions.
Innovation Solution
The integration of a solar rejection filter with a louver layer and optical films, including a microlens array and diffuser, helps suppress reflected sunlight, enhancing contrast by blocking unwanted reflections while allowing horizontal light to pass through, thereby improving visibility of display content in sunny conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a transparent cover is used to protect the display, then the display is protected from environmental damage, but sunlight reflections occur that reduce image contrast and visibility
Solution Approach 1:
A louver layer is introduced as an intermediary component between the transparent cover and the display panel. This louver layer selectively blocks reflected sunlight while allowing direct display light to pass through, mediating between the protective cover and the display to eliminate harmful reflections without sacrificing protection
Solution Approach 2:
The louver layer is positioned specifically at the inner surface of the transparent cover, creating a localized solution where sunlight reflection control is applied precisely where needed. The louvers are oriented at specific angles to target reflected sunlight while maintaining transparency for display viewing
2Illumination intensity
If the louver layer blocks angled sunlight, then contrast is enhanced, but some horizontal light may be blocked
Solution Approach 1:
The louver layer features asymmetric louver structures with specific orientation angles that are optimized to block reflected sunlight (which arrives at angled trajectories) while maintaining transmission for horizontal display light. The asymmetric geometry creates directional selectivity in light blocking
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
This configuration effectively reduces sunlight reflections, enhancing the visibility and contrast of display content for viewers, even in bright sunlight, by strategically blocking angled sunlight while allowing horizontal light to be viewed, thus improving the overall performance of external vehicle displays.
Implementation Method 1
block sunlight reflections
Implementation Method 2
The louvers may be formed from opaque polymer or other opaque material
Implementation Method 3
The optical film(s) may include a microlens array and diffuser to help collimate and homogenize light
Implementation Method 4
The optical film(s) may include a microlens array and diffuser to help collimate and homogenize light
Data Source
AI summary
A system may have an external display that presents content to viewers outside of the system. The external display may have a display panel with an array of pixels formed from light-emitting diodes. Optical films that help collimate and homogenize light from the light-emitting diode pixels may overlap the light-emitting diodes. A transparent cover may overlap the display. The transparent cover may have an outer surface and an opposing inner surface. The outer surface and inner surface may be planar or may have a curved cross-sectional profile. An optical louver layer or other solar rejection layer may be interposed between the inner surface of the transparent cover and the display panel. The louver layer may have a series of elongated parallel louvers formed from an opaque polymer or other material. The louvers may be configured to block sunlight reflections while allowing images on the display panel to be viewed.