Display Board Aging Compensation via Reference LED Feedback
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Solution Overview
Problem
Existing display boards with light emitting elements face challenges in maintaining uniform brightness due to aging differences among elements, which cannot be accurately compensated using statistical data alone, especially in large-screen applications with varying ON times and temperature variations.
Innovation Solution
A display board with an array of addressable light emitting elements and integrated aging determination means, including reference light emitting elements, light measurement, and comparison mechanisms to assess and compensate for aging, ensuring accurate and reliable determination and compensation for brightness uniformity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If statistical data is used to compensate for aging of light emitting elements, then the compensation process is simple, but the accuracy of brightness uniformity is insufficient
Solution Approach 1:
The patent implements a feedback mechanism where light measurement means continuously monitors the actual light output of reference light emitting elements, and comparison means compares these measurements with expected values to determine aging. This feedback loop enables accurate, real-time aging detection that adapts to actual display board conditions rather than relying on statistical averages.
Solution Approach 2:
The display board performs self-diagnosis by using integrated light measurement means to autonomously measure the light output of its own reference light emitting elements. The system determines its own aging state without external intervention, enabling continuous self-compensation for brightness uniformity.
2Measurement precision
If reference light emitting elements are added to determine aging, then aging determination accuracy is improved, but device complexity increases
Solution Approach 1:
The patent combines multiple functions into integrated means: light measurement means that measures both reference and actual light output, comparison means that determines aging by comparing measurements, and control means that compensates for aging. This integration reduces overall system complexity despite adding reference elements.
Solution Approach 2:
The light measurement means serves multiple purposes: it measures the light output of reference light emitting elements for aging determination, and can also measure actual light output from display elements. This multi-functionality reduces the need for separate measurement systems.
3Manufacturing precision
If factory calibration is performed under controlled circumstances, then initial brightness uniformity is achieved, but long-term brightness uniformity deteriorates due to aging
Solution Approach 1:
The patent incorporates reference light emitting elements during manufacturing that are calibrated alongside display elements. These reference elements are prepared in advance to serve as aging benchmarks, enabling continuous compensation throughout the display's operational life rather than relying solely on initial factory calibration.
Solution Approach 2:
The control means dynamically adjusts driving parameters of light emitting elements based on determined aging. By changing operational parameters in response to measured aging, the system maintains brightness uniformity over time despite the natural degradation of light emitting elements.
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 solution provides more reliable and accurate determination of aging, leading to improved brightness uniformity across the display board, minimizing errors and maintaining optimal performance over time.
Implementation Method 1
a display board with an array of addressable light emitting elements and integrated aging determination means, including reference light emitting elements, light measurement, and comparison mechanisms
Data Source
AI summary
The present invention provides a display board (30) comprising an array of light emitting elements (31), a driving means (32) for driving the light emitting elements (31) with image data, and an aging determination means (33). The aging determination means (33) comprises one or more light emitting elements for emitting light representative of the light emitted by the light emitting elements (31) of the display board (30), and at least one reference light emitting element (35) which, during use of the display board (30) is not driven. At the time of an intermediate calibration, the at least one reference light emitting element (35) is driven with calibration data and the light emitted by the reference light emitting element (35) is measured, as well as light representative of the light emitted by the light emitting elements. The difference between the light emitted by the at least one reference light emitting element (35) and the light representative of the light emitted by the light emitting elements is a measure for the degree of aging of the light emitting elements (31) of the array.