Diagnostic Image Display for LED Signboard Reliability
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Solution Overview
Problem
LED-based signboards face challenges in reliability due to LED failures, inefficient data transfer, and color gamut utilization, as well as issues with ambient light affecting color perception, leading to potential downtime, high maintenance costs, and suboptimal image quality.
Innovation Solution
The method involves dynamic fault circumvention in pixels using redundant LEDs, efficient data transfer through networking techniques, and ambient light compensation using sensors and photometric equations to maintain image quality and extend the life of the signboards.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If diagnostic images are displayed to detect LED failures, then reliability can be improved, but the display time is interrupted and observer perception is affected
Solution Approach 1:
The patent implements periodic action by displaying diagnostic images at specific intervals during the normal display sequence. The system alternates between displaying the current image and diagnostic images, with the diagnostic images shown for brief periods (e.g., 10-100 milliseconds) to detect LED failures without causing significant interruption to the overall display function.
Solution Approach 2:
The patent maintains continuity of useful action by ensuring that the diagnostic image display does not significantly interrupt the normal display sequence. The system is designed to show diagnostic images for such brief durations that the overall display function continues uninterrupted, maintaining both reliability detection and display continuity.
2Manufacturing precision
If multiple LEDs are used per pixel to expand color gamut, then image quality is improved, but the complexity of data transfer and control increases
Solution Approach 1:
The patent applies segmentation by dividing the pixel structure into multiple independent LED components (red, green, blue LEDs) that can be controlled separately. Each LED type is driven by dedicated current control circuits, allowing independent adjustment of each LED's intensity to achieve precise color gamut expansion while managing data transfer complexity through structured control architecture.
Solution Approach 2:
The patent implements dynamics by enabling real-time adjustment of LED drive currents based on the desired color output. The system dynamically controls the intensity of each LED type through pulse-width modulation or similar techniques, allowing flexible adaptation to different color requirements while optimizing the data transfer and control complexity for the specific application.
3Manufacturing precision
If ambient light compensation is implemented, then image quality under varying light conditions is improved, but additional sensors and processing are required
Solution Approach 1:
The patent applies feedback by using ambient light sensors to detect the surrounding light conditions and feeding this information back to the control system. The control system then adjusts the LED drive currents accordingly to compensate for ambient light effects, maintaining accurate color reproduction. This feedback mechanism enables color accuracy under varying light conditions while managing the added complexity through intelligent control algorithms.
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 approach minimizes downtime, reduces maintenance costs, enhances image quality by effectively utilizing the color gamut, and maintains uniform image quality across varying ambient light conditions, while also improving the reliability and efficiency of data transfer in LED-based signboards.
Implementation Method 1
ambient light compensation using sensors and photometric equations
Data Source
AI summary
A method displays a single image on a graphical display for diagnostic purpose, without interrupting an observer's perception of the display of a sequence of images. Under that method, a sequence of images is displayed on a graphical display, interrupted only by the diagnostic image that is displayed for a time period not longer than 30 milliseconds. The diagnostic image may be used, for example, for calibrating colors and luminances of pixels in the graphical display. Another use of the diagnostic image may be, for example, determination of the ambient light reflected from the graphical display.