Vehicle HUD Local Dimming for Viewpoint-Adaptive Brightness
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Solution Overview
Problem
Existing head-up displays struggle with inefficient light source control, leading to suboptimal light distribution and increased power consumption due to the vehicle occupant's variable viewpoint, as not all light sources can be effectively turned off using local dimming.
Innovation Solution
An image generating apparatus with a control unit that adjusts the ON/OFF state of multiple light sources based on the occupant's viewpoint, optimizing light distribution and reducing power consumption by selectively turning off sections that have minimal impact on the perceived image.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by stationary object
If local dimming is used to turn OFF light sources, then power consumption and heat generation are reduced, but the light may not appropriately reach the occupant's viewpoint when the viewpoint is not at a predetermined position
Solution Approach 1:
The patent applies dynamics by making the light source control adaptive and variable based on real-time viewpoint detection. The control unit dynamically adjusts which light sources are turned ON or OFF according to the detected occupant viewpoint position, transforming a static lighting system into a dynamic one that responds to changing conditions. This resolves the contradiction by ensuring reliable light delivery to the actual viewpoint while minimizing power consumption through selective dimming.
Solution Approach 2:
The patent implements feedback through a viewpoint detection mechanism that continuously monitors the occupant's viewpoint position and feeds this information back to the control unit. The control unit then adjusts the light source configuration based on this feedback, creating a closed-loop control system. This feedback mechanism ensures that light sources are appropriately controlled to reach the actual viewpoint while optimizing power consumption.
2Use of energy by stationary object
If more light sources are turned OFF through local dimming, then power consumption is reduced, but the image brightness may be insufficient for the occupant's actual viewpoint
Solution Approach 1:
The patent applies local quality by differentiating the control of individual light sources based on their specific contribution to the occupant's viewpoint. Instead of uniform control, each light source is independently evaluated and controlled according to its local importance for illuminating the image at the detected viewpoint position. This allows maximum power reduction while maintaining sufficient brightness where needed.
Solution Approach 2:
The patent implements parameter changes by dynamically adjusting the operational state (ON/OFF) of light sources based on detected viewpoint parameters. The system changes the activation parameters of light sources in response to varying viewpoint positions, optimizing the balance between power consumption and image brightness for each specific viewing condition.
3Temperature
If a predetermined number of light sources are turned OFF, then heat generation is reduced, but the viewpoint adaptability is limited when the occupant's viewpoint changes
Solution Approach 1:
The patent applies dynamics by transforming the static light source configuration into a dynamic system that automatically adapts to changing viewpoint positions. The control unit continuously adjusts which light sources remain active based on real-time viewpoint detection, enabling the system to maintain low heat generation while adapting to various viewing positions without being limited to a predetermined configuration.
Solution Approach 2:
The patent implements universality by designing a light source control system that can effectively serve multiple viewpoint positions through selective activation. The same set of light sources can be dynamically allocated to serve different viewpoint requirements, making the system universally adaptable to various viewing conditions while maintaining efficient heat management.
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
Enhances light source control to minimize heat generation and energy consumption while maintaining image brightness, even as the occupant's viewpoint changes, by dynamically adjusting the sections of light sources based on the occupant's position.
Implementation Method 1
a liquid crystal device (4241) that generates an image using light emitted from the light source
Implementation Method 2
a reflection mirror that reflects light emitted from the image generating apparatus
Data Source
AI summary
An image generating apparatus is provided in a vehicle to generate a predetermined image. The image generating apparatus includes: a liquid crystal unit; a plurality of light sources divided into a plurality of sections; and a control unit that performs local dimming control to turn ON and OFF the plurality of light sources for each of the plurality of sections. The control unit changes a section to be turned OFF according to a viewpoint of an occupant of the vehicle.