Reflector Beam Path Extension for Display Luminance Uniformity
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Solution Overview
Problem
Existing electrical devices with displays configured to operate without reflectors often experience non-uniform luminance due to the lack of a mechanism to extend the beam path of visible light to the display surface, leading to reduced viewability, especially when space constraints limit the distance between the light source and the opening.
Innovation Solution
Incorporating a reflector with a reflective surface within the housing to deflect and extend the beam path of visible light to the display surface, allowing for uniform luminance even when the distance between the light source and the opening cannot be increased, and configuring the light source to emit light in directions that optimize visibility from typical user perspectives.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the distance between the light source device and the opening is increased to lengthen the beam path, then the visible light can travel uniformly over to the opening, but the space within the housing is limited and the distance cannot be increased
Solution Approach 1:
The reflector introduces a spatial dimension change by deflecting the beam path at angles, converting a straight-line path into a multi-segment path that utilizes the housing volume more effectively. This allows the light to travel a longer effective distance through reflection off the reflector surface, achieving uniform luminance without increasing the linear distance between light source and opening.
Solution Approach 2:
The reflector acts as an intermediary element between the light source device and the opening. It receives the visible light from the light source, deflects it according to its reflective surface geometry, and directs it toward the opening. This intermediary component enables beam path extension and uniformity improvement without requiring additional space between the light source and opening.
2Illumination intensity
If a reflector is added to extend the beam path, then the visible light can be made to travel uniformly over to the opening, but the device complexity increases
Solution Approach 1:
The reflector's shape and orientation parameters are specifically designed to achieve the desired beam path deflection. By optimizing the reflector's geometric parameters (such as its curvature, angle, and position), the system achieves uniform luminance distribution while minimizing the need for additional complex components. The parameter optimization allows a single reflector component to perform the beam path extension function effectively.
3Adaptability or versatility
If the light source emits light in multiple directions to optimize visibility, then the viewability from typical user perspectives is improved, but the luminance uniformity becomes more difficult to achieve
Solution Approach 1:
The reflector is designed with non-uniform surface properties and varying angles across its surface area. Different regions of the reflector deflect light at different angles to achieve both multi-directional visibility and uniform luminance distribution. This local variation in the reflector's geometric quality allows it to simultaneously address the conflicting requirements of viewability from multiple angles and uniform light distribution at the opening.
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 ensures uniform luminance and improved viewability of the display surface from outside the housing, even in constrained spaces, enhancing the visibility of the display, particularly in outdoor use or when the device is used autonomously at distances from the user.
Implementation Method 1
a reflector housed in the housing and having a reflective surface configured to reflect the visible light emitted from the light source device toward the opening
Data Source
AI summary
An electrical device may be configured to operate on supplied electric power. The electrical device may include a display configured to display a state related to the electrical device, a control device configured to control the electrical device, and a power supply configured to supply electric power to the electrical device. The display may include: a housing including a housing body, an opening, and a transmissive member, in which the opening is defined through the housing body and the transmissive member covers the opening; a light source device housed in the housing and configured to emit visible light; and a reflector housed in the housing and having a reflective surface configured to reflect the visible light emitted from the light source device toward the opening. The control device may be configured to control the light source device according to the state related to the electrical device.