Light Shaping Array for Uniform Brightness in Head-Up Displays
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Solution Overview
Problem
Traditional head-up displays face challenges in achieving uniform image brightness due to external environmental constraints and increased display area demands, leading to variations in brightness and readability issues.
Innovation Solution
A display system with a light emitting module that includes an array of light emitting units, each equipped with a light shaping unit to adjust emission light fields, creating lateral shifts and rotations to achieve uniform brightness distribution across the display area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the display area of the head-up display is increased to provide more information and enhance user convenience, then the quantity of information displayed is improved, but the image brightness uniformity deteriorates due to variations across the larger display range
Solution Approach 1:
The patent applies local quality by differentiating the light shaping units into two types: first light shaping units for a first region and second light shaping units for a second region. Each type has different optical characteristics tailored to its specific region, enabling uniform brightness distribution across the entire large display area despite the varying optical path lengths and reflection angles
Solution Approach 2:
The display area is segmented into multiple regions (first region and second region) with different brightness characteristics. By dividing the light emitting module into corresponding segments with specialized light shaping units, the system achieves uniform overall brightness while managing the complexity of a large display area
2Area of stationary object
If the display area is increased to meet user interface design requirements, then the information capacity is improved, but the readability deteriorates due to significant brightness variations across the display range
Solution Approach 1:
Different light shaping units are designed with specific optical properties suited for their respective regions. The first light shaping units and second light shaping units create differentiated emission light fields that compensate for position-dependent brightness variations, ensuring consistent readability across the entire display area
Solution Approach 2:
The patent changes optical parameters (light field distribution, emission angles, brightness intensity) of individual light shaping units based on their position in the array. This parameter differentiation ensures that each region contributes uniformly to the overall display, maintaining readability across the expanded display area
3Illumination intensity
If the emission light fields are differentiated by position in the array, then the brightness uniformity is improved, but the device complexity increases due to multiple light shaping unit types
Solution Approach 1:
While introducing different light shaping unit types, the patent maintains a systematic approach where units are assigned to specific regions based on their optical characteristics. This localized specialization achieves brightness uniformity while organizing complexity in a manageable, region-based structure
Solution Approach 2:
The complexity of having multiple light shaping unit types is managed by segmenting the display into distinct regions, each with its own unit type. This segmentation allows the system to handle complexity in a modular fashion, where each segment can be independently optimized and replaced
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 system ensures more uniform image brightness across the viewing area, preventing excessively low brightness and enhancing user experience by optimizing the emission light fields and their reflections on a curved projection surface.
Implementation Method 1
The light shaping unit is disposed on a light emitting side of the light source to receive source light generated by the light source. The source light passes through the light shaping unit to form an emission light field.
Implementation Method 2
Light of the emission light fields of the light emitting units is reflected by the projection surface to collectively form a global range corresponding to the virtual eye area, and the light of each of the mission light fields of the light emitting units is reflected by the projection surface to form a unit band range in the global range.
Data Source
AI summary
A display system and a light emitting module are provided. The display system includes a projection surface, a display module and a virtual eye area. The display module generates an image light reflected by the projection surface and generates an image in the virtual eye area. The display module includes the light emitting module having light emitting units arranged in an array. Each light emitting unit has a light shaping unit disposed on a light emitting side of a light source to receive the source light generated by the light source. The source light passes through the light shaping unit to form an emission light field. In a first direction, compared to the light emitting unit closer to a center of the array, the emission light field of the light emitting unit closer to a side edge of the array has a larger light field distribution bias.