Dynamic Display Light Source With Attenuated Secondary Injection
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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 bulky and heavy electronics due to the need for large current ranges, which complicates the design and increases size.
Innovation Solution
A dynamic light source configuration using two light sources, where one light source emits light that is attenuated and reflected back to the first light source, allowing for a higher dynamic range with similar drive current demands, and optionally utilizing a fibre optic cable to adapt conventional light sources for reduced current requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a conventional light source uses a large current range to achieve high dynamic range of optical power, then the dynamic range is improved, but the device size and complexity increase due to bulky electronics
Solution Approach 1:
A fibre optic cable is introduced as an intermediary component between the light source and the display system. The cable enables signal transmission while allowing the light source to be positioned remotely, thereby reducing the complexity and size of electronics within the display device itself
Solution Approach 2:
The patent extracts the light source from the main display device and positions it separately, connected via fibre optic cable. This separation removes bulky power supply and control electronics from the display unit, reducing its complexity and size while maintaining high dynamic range capability through the remote light source
2Adaptability or versatility
If a conventional light source uses a large current range to achieve high dynamic range of optical power, then the dynamic range is improved, but the device weight increases due to bulky electronics
Solution Approach 1:
The light source and its associated heavy electronics are extracted from the display device and positioned remotely. The fibre optic cable transmits optical signals with minimal weight, significantly reducing the overall weight of the display device while preserving the high dynamic range optical power capability
Solution Approach 2:
The fibre optic cable serves as a lightweight intermediary that transmits optical signals between the remote light source and the display device, replacing heavy electrical connections and power supply components, thereby reducing device weight
3Adaptability or versatility
If a conventional light source uses a large current range to achieve high dynamic range of optical power, then the dynamic range is improved, but the device volume increases due to bulky electronics
Solution Approach 1:
The light source assembly and its bulky electronics are extracted from the display device volume. The fibre optic cable occupies minimal space, allowing the display device to be compact while the light source can be positioned in a separate location with adequate space for its electronics
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 higher dynamic range of light output with substantially similar drive current demands, potentially reducing device size and complexity by allowing for a smaller and simpler design.
Implementation Method 1
The light source may comprise a fibre optic cable
Implementation Method 2
The reflective aperture 150 reflects incident light 140 that is incident onto aperture 140 such that the light is reflected back towards the light source 120
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 and that light output by the first device from the second light source is attenuated more than light output by the first light source, and an amount of attenuation is based on an intended dynamic power range of the dynamic light source.