HD Headlamp Pixel Error Avoidance via Displacement Vector
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Solution Overview
Problem
High-definition headlamps often suffer from pixel errors due to defective LEDs, which can render projected information, such as alerts or warnings, undecipherable by drivers, as existing solutions either shift images to defect-free regions or reduce brightness, but do not effectively minimize pixel errors based on image content.
Innovation Solution
A method and system that generate a displacement vector to reposition partial image content within the light image matrix, avoiding defective LEDs by determining the optimal displacement to minimize pixel errors, allowing the image to be projected in regions with fewer or no errors, using a set of coordinate pairs for defective LEDs and a specified function to adjust the image's position within the matrix.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If image content is displayed in the original position, then the display position is fixed and simple, but pixel errors from defective LEDs cause disruptions and render information undecipherable
Solution Approach 1:
The system performs preliminary detection of defective LEDs during manufacturing or initialization, storing their coordinates in advance. This allows the system to pre-calculate displacement vectors for all possible image positions, so that when display is needed, the image can be immediately repositioned without real-time analysis, thus improving reliability without adding significant processing complexity during operation.
Solution Approach 2:
The patent introduces an intermediary processing layer (the control device) that sits between the image source and the LED matrix. This intermediary calculates displacement vectors and adjusts image positions to avoid defective pixels, effectively mediating between the fixed LED hardware and the variable image content to ensure reliable display.
2Reliability
If image content is shifted to avoid defective pixels, then pixel errors are reduced, but the image position becomes variable and requires additional processing
Solution Approach 1:
The system changes the positional parameters of the image content based on the detected defective pixel locations. By calculating displacement vectors that shift the image to positions avoiding defective LEDs, the system dynamically adjusts display parameters while maintaining image integrity and clarity.
Solution Approach 2:
The patent creates a virtual copy of the image at a displaced position rather than physically moving the original. The control device generates a new image layer with adjusted coordinates that avoids defective pixels, allowing the original image to remain unchanged while a corrected version is displayed, thus managing complexity through virtual duplication.
3Object-affected harmful factors
If brightness is reduced near defective pixels, then pixel errors are softened, but the overall display brightness and visibility decrease
Solution Approach 1:
Instead of modifying the entire image or using brightness reduction, the system extracts and removes only the problematic defective pixels from the display equation by displacing the image content. This selective removal approach eliminates the harmful effect of defective pixels without needing to dim surrounding areas, thus maintaining overall display brightness and visibility.
Data Source
AI summary
A high-definition vehicular headlamp has a light module configured to produce a matrix of light-emitting points each of which has a coordinate pair. The headlamp generates a light image in front of the vehicle, and the light image is divided into a matrix of pixels that correspond respectively to the light-emitting points of the light module. A specified partial image content is generated in a partial region of the light image. The partial image content acts upon a set of coordinate pairs of light-emitting points, including coordinate pairs having defective light-emitting points that could cause pixel errors. A displacement vector is formed by comparing coordinate pairs of defective light-emitting points with the set of coordinate pairs of the light-emitting points on which the partial image content acts, and the partial image content is reproduced in the partial region of the light image that has been displaced by the displacement vector.