Hologram Light Guide Plate for Multi-Image HUD Light Routing
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Solution Overview
Problem
Existing head-up display systems for vehicles have low utilization efficiency of light sources due to the blocking of two out of three beams by shutters, leading to reduced light emission and increased power consumption, heat generation, and complexity in the optical system.
Innovation Solution
An image display device utilizing a hologram light guide plate with distinct emission regions for different types of display light, guided by polarization-dependent holograms, which increases the utilization efficiency of each type of display light and simplifies the system by reducing the size and complexity of the light guide plate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If two out of three beams are blocked by shutters to achieve image display, then image display function is realized, but light utilization efficiency is reduced
Solution Approach 1:
The light guide plate is divided into multiple functional regions: a first region for receiving light from the light source, a second region for forming a first image using a first hologram, and a third region for forming a second image using a second hologram. This segmentation allows different portions of the light to be utilized for different imaging purposes simultaneously, eliminating the need to block beams with shutters and thereby improving light utilization efficiency while maintaining the required image display functionality.
2Adaptability or versatility
If multiple beams are blocked by shutters to display different images, then multiple images can be displayed, but the system becomes more complex and larger in size
Solution Approach 1:
Multiple holograms (first hologram and second hologram) are integrated into a single light guide plate structure, which also serves as the projection medium. The light guide plate combines light guidance, beam splitting, and image formation functions in one component, eliminating the need for separate shutters and complex optical paths. This merging approach enables multi-image display capability while reducing overall system complexity and size.
Solution Approach 2:
The light guide plate performs multiple functions simultaneously: it guides light from the source, splits the light into different beams through holographic diffraction, and forms multiple images at different positions. This multi-functionality eliminates the need for separate components like shutters and multiple projection optics, thereby achieving versatile multi-image display without increasing system complexity.
3Ease of operation
If shutters are used to block beams, then image selection is achieved, but power consumption and heat generation increase
Solution Approach 1:
The mechanical shutter system is replaced with a holographic optical system where light beams are directed to different images through holographic diffraction and interference patterns. This optical control mechanism eliminates the need for mechanical moving parts, reducing power consumption and heat generation while maintaining the capability to select and display different images through optical path control.
4Loss of energy
If a hologram light guide plate with distribution region is used to guide display light, then light utilization efficiency is improved, but the structure becomes more complex
Solution Approach 1:
The distribution region within the light guide plate performs multiple functions: it guides light from the source to appropriate regions, splits light into different beams through holographic diffraction, and directs beams to form different images. By integrating these functions into a single holographic structure rather than using separate optical components, the patent achieves improved light utilization efficiency without proportionally increasing structural complexity.
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 enhances the utilization efficiency of display light, reducing heat generation, power consumption, and system complexity while allowing for the display of multiple images at different viewing distances, improving the overall performance and cost-effectiveness of the image display device.
Implementation Method 1
a distribution region having a hologram dependent on the optical characteristic and configured to guide the first type of the display light and the second type of the display light, out of the plurality of types of display light incident from the incident region, to the first emission region and the second emission region, respectively
Data Source
AI summary
An image display device includes: a hologram light guide plate; and a display light generator configured to cause a plurality of types of display light whose states are different from each other in a predetermined optical characteristic to be incident on the hologram light guide plate. The hologram light guide plate includes a first emission region having a hologram for causing a first type of the display light to form an image, a second emission region having a hologram for causing a second type of the display light to form an image, and a distribution region configured to guide the first type of the display light and the second type of the display light, out of the plurality of types of incident display light, to the first emission region and the second emission region, respectively.