LED Pixel Fault Compensation via Dynamic Current Adjustment
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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 reduced image quality and increased maintenance costs.
Innovation Solution
The implementation of a system that dynamically detects and compensates for LED faults by adjusting current levels in functional LEDs, utilizes redundant LED strings, and employs gamut expansion techniques to enhance color richness, while also incorporating sensors to adjust luminous intensities based on ambient light conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If LED-based signboards use a large number of LEDs to produce multicolored images, then color gamut and image quality are improved, but reliability decreases due to increased probability of LED failure
Solution Approach 1:
The patent divides the LED array into multiple independently controllable segments or modules. When a fault is detected in one segment, the system can isolate and disable only that segment while maintaining operation of other segments, thereby preserving overall system reliability without sacrificing color gamut capabilities.
Solution Approach 2:
The system dynamically adjusts operational parameters such as current distribution and brightness levels across different LED segments based on detected faults. By redistributing current to functional segments, the system maintains image quality and color reproduction despite the presence of faulty LEDs.
2Reliability
If the system continuously monitors and compensates for LED faults, then reliability and operational continuity are improved, but device complexity increases
Solution Approach 1:
The system incorporates self-diagnostic capabilities where LED segments automatically test their own functionality and report status to the control system. This self-service approach enables continuous monitoring and fault compensation without requiring complex external monitoring equipment, reducing overall system complexity while maintaining high reliability.
3Measurement precision
If ambient light sensors are added to adjust luminous intensities, then color perception accuracy is improved, but device complexity and manufacturing cost increase
Solution Approach 1:
The patent integrates ambient light sensors into the existing LED driver circuitry, enabling the same hardware components to serve multiple functions: driving LEDs, detecting ambient light, and adjusting luminous intensities accordingly. This multi-functionality approach improves color perception accuracy without proportionally increasing device complexity or manufacturing cost.
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 enables continuous operation with minimal downtime due to fault compensation, reduces maintenance costs, enhances image quality by effectively utilizing the color gamut, and maintains consistent color perception across varying ambient light conditions.
Implementation Method 1
Light emitting diodes (LEDs) produce most of the active images shown on modern advertising structures
Implementation Method 2
Each pixel is capable of displaying a wide range ('gamut') of colors. Typically, each pixel is made up of three kinds of LED. Each 'kind' of LEDs may consist of a single LED, or a serially connected string of LEDs, providing a specific color of light ('primary color').
Data Source
AI summary
An apparatus dynamically circumvents faults in the light emitting diodes (LEDs) of a pixel in a graphical display. The LEDs are organized into groups of one or more LEDs. The apparatus includes drivers for generating a current to an associated group of LEDs of the pixel and fault detectors associated with each group of LEDs. The drivers may be driven, for example, by pulse-modulated signals specifying average currents for the groups of LEDs. The fault detectors each detect fault in an associated group of LEDs and asserts a fault signal when a fault is detected. In addition, an encoder is provided to receive the fault signals from the fault detectors and to provide signals encoding the faults detected and identifying the associated groups of LEDs. A controller that receives the encoded signals may adjust the driver signals for the groups of LEDs for which no fault is detected, in order to compensate for the detected faults.