Multi-HUD Projection Synchronization for Boundary Brightness Consistency
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Solution Overview
Problem
In vehicle head-up display (HUD) systems, the visibility and comfort are compromised due to brightness differences at the boundaries between adjacent projection areas when multiple HUDs are used, especially under varying external light conditions, leading to discomfort and degraded visibility.
Innovation Solution
A projection display system with multiple HUDs, each equipped with brightness detection units and control units that synchronize the projection conditions, including luminance and tint, across adjacent areas to maintain consistent image quality and reduce discomfort.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If multiple independent HUDs are mounted on a vehicle to cover large projection areas, then the display coverage is improved, but brightness inconsistency occurs at boundaries between adjacent projection areas
Solution Approach 1:
The patent merges multiple independent HUD systems into a coordinated display system where projection conditions are synchronized across devices. The control unit receives projection condition information from other HUDs and adjusts its own projection to match, effectively combining multiple projection areas into a unified display with consistent brightness and characteristics across boundaries.
Solution Approach 2:
The system implements feedback mechanisms where each HUD's control unit receives projection condition information from other HUDs in the system. This feedback loop allows real-time adjustment of projection parameters to maintain consistency across adjacent projection areas, preventing brightness mismatches at boundaries.
2Adaptability or versatility
If each HUD independently controls brightness based on local sensor detection, then adaptability to ambient light is improved, but brightness differences occur at boundaries due to sequential switching
Solution Approach 1:
The control unit performs multiple functions: it detects ambient light conditions locally, receives projection condition information from other HUDs, and adjusts its projection parameters accordingly. This multi-functionality allows the system to maintain both local adaptability and global consistency simultaneously.
Solution Approach 2:
The system performs preliminary synchronization of projection conditions before actual projection occurs. The control unit receives and processes projection condition information from other HUDs in advance, ensuring that all devices are ready to project with matching parameters, thereby preventing brightness differences before they occur.
3Stability of the object's composition
If projection conditions are synchronized across multiple HUDs, then brightness consistency is improved, but system complexity increases
Solution Approach 1:
The control unit acts as an intermediary that receives projection condition information from other HUDs and translates it into appropriate projection adjustments. This intermediary function simplifies the overall system architecture by providing a standardized interface for synchronization without requiring complex direct peer-to-peer communication between all devices.
Data Source
AI summary
A projection display system and a control method of controlling a projection display device capable of preventing degradation of visibility or occurrence of a sense of discomfort at a boundary between respective projection areas due to dimming are provided. In a system including a plurality of projection display devices (100A, 100B, 100C) that project image light onto a plurality of areas in one projection surface, each of the plurality of projection display devices includes a brightness detection unit (47b), and a first control unit (52) that controls a projection condition for the image light that is projected on the basis of detected brightness information, and a second control unit (53) that performs control to cause a projection condition for the image light of the second projection display device (100B) to match a projection condition determined by the first control unit (52) of the first projection display device (100A).