LCD Display Unit Warping Function for Reflection Displays
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Solution Overview
Problem
In reflection display systems, particularly panorama head-up displays (PHUDs), the display image is distorted due to the curvature of the windshield, leading to bothersome gray regions and increased energy consumption.
Innovation Solution
An LCD display unit with a selectively controllable backlight arrangement divided into dimming zones, where the dimming zones are shaped and sized according to a warping function to compensate for the distortion, and the backlight is deactivated in regions without active image points to minimize gray regions and optimize energy use.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the display image is distorted using a warping function to compensate for windshield curvature, then the perceived image quality is improved, but the backlight arrangement cannot be efficiently deactivated in rectangular regions, resulting in increased energy consumption and larger gray regions
Solution Approach 1:
The backlight arrangement is divided into multiple selectively controllable dimming zones that can be independently activated or deactivated. This segmentation allows the system to deactivate specific zones where only black image points are displayed, reducing energy consumption while maintaining image quality through warping compensation.
Solution Approach 2:
Different regions of the display surface are treated differently through localized dimming control. The warping function enables precise mapping between perceived display coordinates and output display coordinates, allowing the system to apply different backlight activation patterns in different regions based on the actual image content and distortion requirements.
2Manufacturing precision
If the display image is distorted using a warping function to compensate for windshield curvature, then the perceived image quality is improved, but rectangular dimming zones create bothersome gray regions around displayed objects
Solution Approach 1:
The display surface is divided into multiple dimming zones that can be independently controlled. This segmentation allows the system to precisely deactivate backlight only in regions where black image points are displayed, eliminating the rectangular gray regions that would otherwise be visible around displayed objects.
Solution Approach 2:
The warping function enables the system to apply localized dimming control that adapts to the distorted geometry of the display image. By mapping dimming zone boundaries according to the warping function, the system ensures that deactivated regions precisely match the black image areas, eliminating visible gray regions while maintaining image quality.
3Use of energy by moving object
If the backlight arrangement is divided into dimming zones for selective deactivation, then energy consumption is reduced, but the zones must cover the entire display surface, creating gray regions in distorted images
Solution Approach 1:
The backlight arrangement is segmented into multiple dimming zones that can be independently controlled. The warping function enables the system to optimize the distribution and boundaries of these zones, deactivating only the minimum necessary areas where black image points are displayed, thereby reducing energy consumption without creating visible gray regions.
Solution Approach 2:
The system applies localized dimming control where needed, using the warping function to map dimming zone boundaries to the distorted display geometry. This allows selective deactivation of backlight in specific regions without affecting other areas, eliminating gray regions while maintaining energy efficiency.
4Manufacturing precision
If the display image is distorted to match windshield curvature, then the perceived display image is correct, but the gray region surrounding displayed objects becomes more prominent and bothersome
Solution Approach 1:
The warping function enables the system to apply localized dimming control that precisely matches the distorted geometry of the display image. By adjusting the boundaries and activation state of individual dimming zones according to the warping transformation, the system eliminates gray regions in the perceived display image while maintaining accurate image presentation.
Solution Approach 2:
The display surface is divided into multiple dimming zones that can be independently controlled. This segmentation, combined with warping-based coordinate mapping, allows the system to precisely deactivate backlight only where black image points are displayed in the distorted image, eliminating prominent gray regions while maintaining display accuracy.
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
Reduces bothersome gray regions and minimizes energy consumption by adapting the dimming zones to the distorted display image, ensuring a clear and efficient presentation.
Implementation Method 1
an LCD pixel matrix for selectively controlling image points for presenting a display image on a display surface
Implementation Method 2
a backlight arrangement, which is divided into selectively controllable dimming zones in order to light regions having a plurality of image points with backlight
Implementation Method 3
the display image of the display unit is not imaged precisely like the original, but is generally curved or distorted and changed in terms of its dimensions. In order to correctly present the distortion and the aspect ratio in the display image perceived via the reflection surface, the output display image on the display surface of the display unit is distorted
Data Source
AI summary
An LCD display unit for a reflection display system in a motor vehicle includes an LCD pixel matrix for selectively controlling picture elements for presenting a display image on a display area; a backlight arrangement, which is divided into selectively controllable dimming zones in order to illuminate regions containing multiple picture elements with background light; and a control unit, which is configured to control the LCD pixel matrix so that the display image is output, the display image being distorted using a warping function in order to compensate for a distortion of the display image as a result of reflection from a reflection region. The dimming zones have a shape and a size determined by the warping function.