Head-Up Display Brightness Compensation for Uniform Projection
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Solution Overview
Problem
Current vehicle projection-type head-up display systems suffer from regional brightness and chromaticity differences, which negatively impact the driving experience.
Innovation Solution
The head-up display system includes a display and a projection screen, where the display is divided into regions with varying brightness and chromaticity, and the projection screen is designed to minimize regional brightness and chromaticity differences by adjusting light intensity and chromaticity compensation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a projection-type head-up display system is used to achieve small size and large-scale projection, then the driver's distraction risk is reduced, but regional brightness differences and chromaticity differences occur in the projected image
Solution Approach 1:
The patent applies local quality by dividing the display into multiple regions (first region adjacent to projection screen, second region away from projection screen) and applying different brightness adjustments to each region. The display controller separately controls the brightness of each region to compensate for the inherent brightness and chromaticity non-uniformities in the projection system, thereby achieving overall image uniformity.
2Volume of moving object
If the display is positioned close to the projection screen to minimize system size, then device compactness is improved, but brightness and chromaticity non-uniformity increases in the projected image
Solution Approach 1:
The patent employs parameter changes by dynamically adjusting the brightness parameters of different display regions based on their distance from the projection screen. The display controller modifies the luminance output of each region to compensate for the optical path differences, ensuring uniform brightness distribution in the projected image while maintaining the compact display-projection screen configuration.
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 design improves the consistency of regional brightness and chromaticity in the projected image, enhancing the driving experience by reducing distractions and improving visual clarity.
Implementation Method 1
The projection screen is disposed adjacent to the display and is configured to let the first image to be projected thereon to form a second image
Data Source
AI summary
A head-up display system and a vehicle system are provided. The head-up display system includes a display and a projection screen. The display is configured to display a first image. The projection screen is disposed adjacent to the display and is configured to let the first image to be projected thereon to form a second image. The display includes a first region adjacent to the projection screen and a second region away from the projection screen. The projection screen includes a third region adjacent to the display and a fourth region away from the display. When the display displays the first image, a brightness difference between the first region and the second region is greater than a brightness difference between the third region and the fourth region.