Vehicular Bezel Light Guide Member for Windshield Reflection Reduction
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Solution Overview
Problem
In vehicular display devices, external light reflection on the windshield becomes visible due to the contrast between the descending wall and its peripheral portion, and the light guide member's inefficiency in guiding light to the descending wall, leading to reduced visibility and passenger discomfort.
Innovation Solution
A bezel body with a plate-like light guide member and a reflection portion that guides external light to the descending wall, diffuses light to prevent unevenness, and includes a support member to reflect light back to the light guide member, ensuring efficient light distribution and reducing dust intrusion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a translucent descending wall is provided to prevent external light from reaching the cover, then external light reflection is reduced, but the descending wall appears dark due to insufficient light guidance
Solution Approach 1:
A light guide member is introduced as an intermediary between the light source and the descending wall. This light guide member efficiently transmits light from the light source to the descending wall, ensuring adequate illumination while maintaining the descending wall's function of preventing external light reflection.
Solution Approach 2:
The light guide member is designed with specific optical parameters (refractive index, geometry) to optimize light transmission efficiency. By changing the optical parameters of the light guide member, the system achieves both sufficient illumination of the descending wall and effective blocking of external light reflection.
2Illumination intensity
If the light guide member is exposed at the front side to allow external light incidence, then light guidance function is improved, but dust enters from the gap between the light guide member and descending wall
Solution Approach 1:
A protective film or cover is applied to seal the gap between the light guide member and the descending wall. This thin film prevents dust intrusion while maintaining the optical functionality of the light guide member, allowing light to pass through without compromising the seal.
Solution Approach 2:
The light guide member is nested within a housing structure that provides a sealed environment. The descending wall is positioned to overlap with the light guide member, creating a nested configuration that prevents dust entry from the front side while allowing light guidance to function effectively.
3Illumination intensity
If the light guide member guides light from the front side, then light transmission is improved, but light is not totally reflected on the lower surface due to small incidence angle
Solution Approach 1:
The light guide member is designed with a three-dimensional geometry that changes the path of light in multiple dimensions. By introducing vertical and angular components to the light path, the system increases the incidence angle on the lower surface, enabling total internal reflection and reducing light loss.
Solution Approach 2:
The light guide member incorporates curved or angled surfaces instead of flat parallel surfaces. This curvature modifies the light incidence angles dynamically, ensuring that light rays strike the lower surface at angles greater than the critical angle for total internal reflection, thereby minimizing energy loss.
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 solution effectively reduces the visibility of the descending wall's reflection on the windshield, enhancing passenger comfort by ensuring the descending wall is adequately illuminated and reducing dust entry, thus minimizing discomfort caused by external light reflection.
Implementation Method 1
guides light entering an end face at the front side of the vehicle toward the descending wall
Implementation Method 2
the reflection portion reflecting light by changing an advancing direction to a thickness direction
Data Source
AI summary
Provided are a bezel body and a vehicular display device that effectively reduces a sense of discomfort provided to a passenger by making reflection on a windshield less visible. Since a reflection portion is formed in a predetermined area on a lower surface of a light guide member at the rear side, the guided external light is easy to reflect upward, whereby light can efficiently be emitted from the light guide member toward a descending wall. Therefore, this configuration can prevent the descending wall from being darkly reflected on a windshield, thereby making the reflection less visible and effectively reducing a sense of discomfort provided to the passenger.