Head-up Display Light Distribution Adjustment for Luminance
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Solution Overview
Problem
Conventional head up display devices suffer from reduced luminance and light use efficiency due to misalignment of light distribution axes, resulting in weak image light reaching the viewer.
Innovation Solution
Incorporation of light distribution adjustment means, such as biconvex lenses or cylindrical lenses, between the screen and imaging optical system to refract and adjust the projection light, ensuring the image light is directed along the optical paths to the viewer's point of sight.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If projection light is directly projected onto the transmission type screen without light distribution adjustment, then the optical system is simple, but the light distribution axes do not align with the optical paths to the viewer's point of sight, resulting in reduced luminance and light use efficiency
Solution Approach 1:
A light distribution adjustment means (intermediary optical element) is introduced between the projection lens and transmission type screen to refract and redirect the projection light. This intermediary component adjusts the light distribution axes to align with the optical paths directed to the viewer's point of sight, thereby improving luminance and light use efficiency without fundamentally complicating the overall optical system architecture
Solution Approach 2:
The light distribution adjustment means modifies the directional parameters of the projection light by refraction, changing the light distribution axes angles to match the required optical paths. This parameter adjustment ensures that image light from different regions of the transmission type screen is properly directed to the viewer's point of sight, resolving the misalignment issue while maintaining system simplicity
2Loss of energy
If projection light is directly projected onto the transmission type screen without light distribution adjustment, then the device structure is simple, but light use efficiency is reduced due to misalignment of light distribution axes with optical paths
Solution Approach 1:
The light distribution adjustment means serves as an intermediary optical element that efficiently redirects projection light along the correct optical paths. By introducing this focused intermediary component, the system achieves proper alignment between light distribution axes and optical paths to the viewer's point of sight, minimizing light loss and improving overall light use efficiency without requiring extensive structural modifications
Solution Approach 2:
The light distribution adjustment means optimizes light use efficiency by changing the directional parameters of projection light through refraction. It adjusts the light distribution axes to precisely match the optical paths directed to the viewer's point of sight, ensuring maximum light utilization and minimizing energy loss while maintaining a relatively simple device structure
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 solution efficiently directs image light to the viewer, enhancing luminance and light use efficiency of the virtual image recognized.
Implementation Method 1
light distribution adjustment means for adjusting light distribution of the image light emitted from the screen in each region by refracting the projection light
Data Source
AI summary
The purpose of the present invention is to efficiently orient image light toward an observer. A display device outputs projection light for displaying an image. A transmission type screen forms an image of the projection light and diffuses the same as image light. A projection lens enlarges projection light and forms the image on the transmission type screen. A light distribution adjustment means is disposed between the transmission type screen and the projection lens and adjusts the light distribution of the image light output by the transmission type screen for each region by refracting the projection light.