Dynamic Light Source Segmentation for HUD Power Range
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Solution Overview
Problem
Conventional light sources for applications like head-up displays (HUD) and head-mounted displays (HMD) face challenges in achieving a high dynamic range of optical power with high current ranges, leading to bulky and heavy electronics due to the need for complex and large electronics to manage these high current ranges.
Innovation Solution
A dynamic light source configuration that includes a first light source and a second light source, where the second light source emits light to enhance the output power range by reflecting it back towards the first light source, allowing for a greater dynamic range of power with reduced electrical current, and optionally using a fibre optic cable to couple external light, thereby simplifying the device.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If conventional light sources are used to achieve high dynamic range of optical power, then the current range required increases, but the device complexity and size increase due to complex electronics needed to manage high current ranges
Solution Approach 1:
The patent divides the light source system into multiple independent light sources (first light source and second light source), each handling different intensity ranges. The first light source handles higher intensity requirements while the second light source provides lower intensity levels, eliminating the need for complex electronics to manage wide current ranges in a single source.
Solution Approach 2:
The patent changes the operational parameters by using multiple light sources with different characteristic ranges. By selecting light sources optimized for different intensity ranges and combining them, the system achieves high dynamic range without requiring the electronics to handle the full extreme range of currents.
2Illumination intensity
If conventional light sources are used to achieve high dynamic range of optical power, then the current range required increases, but the device weight increases due to bulky electronics
Solution Approach 1:
The patent segments the light source into multiple units with different intensity capabilities. This segmentation allows each unit to be optimized for its specific range, eliminating the need for heavy electronics that would be required to control a single source across the entire dynamic range.
3Illumination intensity
If a single light source is used to cover high current ranges, then the dynamic range of power is limited, but using multiple light sources increases device complexity
Solution Approach 1:
The patent applies segmentation by using multiple light sources that can be independently controlled. Each light source handles a specific portion of the intensity range, and their combined output provides the full dynamic range. This approach is simpler than using a single light source that would require complex electronics to achieve the same range.
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 configuration enables a dynamic range of power that is an order of magnitude greater than conventional systems for the same current range, resulting in a more compact and efficient light source with reduced bulk and weight.
Implementation Method 1
a second light source 230 which emits light towards the first light source 220
Implementation Method 2
the first device 210 is further configured to reflect light incident outside the first cone of angles 240 back towards the first light source 220
Implementation Method 3
the second light source 230 comprises a fibre optic cable 240 which may be used to couple the light from an external light source into the first device 210
Data Source
Figure 1A~3
AI summary
A dynamic light source for a display is disclosed. The dynamic light source comprises a first light source located inside a first device; and a second light source. The first device is configured to allow light from the first light source to exit the first device in a first cone of angles and to reflect light incident outside the cone of angles back towards the first light source. The first device is configured such that injected light from the second light source is reflected by the first light source in a second cone of angles substantially coincident with the first cone of angles.