Birefringent Backlight Assembly for Dual HUD Images With Lower Power
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Solution Overview
Problem
Existing head-up display systems with dual virtual image capabilities require additional backlight assemblies, leading to high power consumption and heat generation due to the complexity of optical paths.
Innovation Solution
A backlight assembly utilizing a birefringent component to divide light into polarized lights with perpendicular polarization directions, adjusted by dimmers to propagate along different paths, eliminating the need for multiple assemblies and reducing power consumption and heat.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If two sets of optical paths are built to display two virtual images simultaneously, then dual virtual image display capability is achieved, but power consumption increases and heat is generated
Solution Approach 1:
The patent merges two separate backlight assemblies into one by using a single backlight source that passes through a polarization separation component. This component divides the backlight into two polarized light beams with different polarization directions, which then serve two different optical paths simultaneously. This combining approach eliminates the need for two independent backlight sources, thereby reducing power consumption while maintaining dual virtual image display capability.
2Adaptability or versatility
If two sets of optical paths are built to display two virtual images simultaneously, then dual virtual image display capability is achieved, but device complexity increases
Solution Approach 1:
The patent combines two separate backlight assemblies into one integrated unit by introducing a polarization separation component. This component splits the light from a single backlight source into two polarized beams that feed into two different optical paths. By sharing the backlight source and using polarization differentiation, the system achieves dual virtual image display with reduced structural complexity compared to having two completely independent assemblies.
Solution Approach 2:
The patent utilizes polarization direction as a distinguishing parameter to separate two optical paths. By using a polarization separation component that divides light based on polarization directions (e.g., 0 degrees and 45 degrees), the system can route different polarized light beams through different optical paths using the same physical space and components. This parameter-based differentiation allows for simplified system architecture while maintaining the ability to display two virtual images simultaneously.
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 reduces power consumption and heat generation by optimizing the optical path configuration, allowing for dual virtual image display without increasing assembly count.
Implementation Method 1
a birefringent component configured to divide the light incident on the birefringent component into a first polarized light and a second polarized light, wherein a vibration direction of the first polarized light is different from a vibration direction of the second polarized light
Data Source
AI summary
A backlight assembly including a light source, a birefringent component and at least one first dimmer is described. In an embodiment, the birefringent component is configured to divide the light incident on the birefringent component into a first polarized light and a second polarized light. In an embodiment, a vibration direction of the first polarized light is different from a vibration direction of the second polarized light. In an embodiment, the birefringent component includes a first region and a second region. In an embodiment, the first polarized light corresponds to the first region, the second polarized light corresponds to the second region, and the first region and the second region at least partially do not overlap in an emission direction of the light. In an embodiment, the first polarized light propagates along a first direction, the second polarized light propagates along a second direction intersecting with the second direction.