Vehicle HUD Matrix Backlight for Wide Field of View
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Solution Overview
Problem
Traditional head-up display (HUD) systems have limited field of view and brightness, making it difficult to display virtual images effectively, especially in augmented reality applications, due to restricted installation space, high reflection losses at windshields, and increased cooling requirements for high brightness displays.
Innovation Solution
A head-up display apparatus featuring a transmissive display layer with selectively controllable elements and a matrix backlight with collimation lenses, allowing for a wider field of view and increased brightness, achieved through a compact, efficient design that includes a collimation array and a reflection-suppressing deflection arrangement to reduce energy consumption and enhance visibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a traditional projection optical unit is used, then the HUD structure is compact, but the field of view is limited and only reaches just as far as the horizon
Solution Approach 1:
The projection optical unit is divided into multiple independent lens modules arranged in a matrix pattern. Each lens module projects a portion of the display image, collectively forming the complete virtual image. This segmentation allows the system to achieve a wider field of view without requiring a single large-volume optical unit.
Solution Approach 2:
The patent transitions from a traditional single-axis projection optical path to a two-dimensional matrix arrangement of lens modules. This dimensional change enables the system to cover a broader angular range and extend the field of view both horizontally and vertically, effectively projecting virtual images beyond the horizon while maintaining a compact footprint.
2Illumination intensity
If the display brightness is increased to overcome reflection losses at the windshield, then visibility improves, but cooling requirements and energy consumption increase
Solution Approach 1:
The matrix backlight unit employs local dimming control, where individual or groups of LED light sources can be independently adjusted in brightness. This allows the system to increase display brightness only in specific regions where needed to overcome reflection losses, rather than uniformly increasing the entire display's brightness, thereby reducing overall energy consumption and cooling requirements.
Solution Approach 2:
The patent utilizes the adjustable luminous intensity parameter of LED light sources to dynamically adapt display brightness. By changing the brightness parameter of individual LED modules in the matrix backlight, the system can optimize visibility against varying background conditions while minimizing energy consumption and thermal generation.
3Illumination intensity
If the display brightness is increased to overcome reflection losses at the windshield, then visibility improves, but energy consumption increases
Solution Approach 1:
The matrix backlight unit employs local dimming control, where individual or groups of LED light sources can be independently adjusted in brightness. This allows the system to increase display brightness only in specific regions where needed to overcome reflection losses, rather than uniformly increasing the entire display's brightness, thereby reducing overall energy consumption and cooling requirements.
Solution Approach 2:
The patent utilizes the adjustable luminous intensity parameter of LED light sources to dynamically adapt display brightness. By changing the brightness parameter of individual LED modules in the matrix backlight, the system can optimize visibility against varying background conditions while minimizing energy consumption and thermal generation.
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 enables a significantly brighter and more homogeneous display with reduced energy consumption, allowing for extended field of view and improved visibility of virtual images against bright backgrounds, while minimizing distracting reflections and maintaining high representation quality.
Implementation Method 1
a two-dimensional collimation array having collimators arranged respectively between a light source and the transmissive display layer
Implementation Method 2
a projection screen arranged in the beam path of the projection light beam generated by the imaging unit and configured for reflecting the projection light beam toward a user
Data Source
AI summary
A head up display apparatus for a vehicle includes an imaging unit that generates a projection light beam with display content and includes a transmissive display indication layer with selectively controllable display elements distributed over an area, a matrix backlight that provides backlighting therefor and includes selectively controllable light sources distributed along the transmissive display indication layer, and a collimation array with collimators arranged between a light source and the transmissive display indication layer, and a projection panel in the beam path of the projection light beam generated by the imaging unit for reflecting the projection light beam to a user, the projection panel being arranged in the beam path such that a virtual display image is generated therebehind in the visual field of the user.