LED Pixel Synchronization and Failure Mitigation for Fine-Pitch Displays
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Solution Overview
Problem
Conventional LED array devices face challenges in achieving small pixel pitches for high-resolution displays while managing complexity and cost, particularly due to the increased density of electrical devices and thermal crowding in driver electronics.
Innovation Solution
The implementation of active electrical elements within LED packages that include driver devices, signal conditioning, memory, ESD protection, and thermal management, enabling active matrix addressing and synchronization of LED pixels for coordinated operation, as well as bidirectional communication for failure mitigation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If pixel pitch is reduced for higher resolution displays, then image resolution is improved, but device complexity and thermal crowding increase
Solution Approach 1:
The patent combines multiple electrical devices (driver electronics, capacitors, FETs, decoders, microcontrollers) into integrated circuit packages that are mounted on the LED panel substrate. This consolidation reduces the number of discrete components, simplifies the overall device structure, and decreases thermal crowding while maintaining the high resolution achieved through small pixel pitches.
Solution Approach 2:
The patent transitions from planar arrangement of discrete electrical devices to three-dimensional integrated circuit packaging and stacking. By utilizing vertical space and multiple layers on the substrate, the design accommodates higher device density without increasing the horizontal footprint, thereby maintaining small pixel pitches without proportionally increasing device complexity.
2Measurement precision
If pixel pitch is reduced for higher resolution displays, then image resolution is improved, but thermal crowding increases
Solution Approach 1:
The patent integrates multiple electrical devices into single packaged units with combined thermal management structures. By merging devices that generate heat into unified packages with shared heat dissipation pathways, the overall thermal density is reduced compared to having numerous discrete heat-generating components distributed across the small pixel pitch area.
Solution Approach 2:
The patent introduces intermediate thermal management structures such as heat sinks, thermal vias, and heat spreaders that are integrated into the LED package and panel substrate. These intermediary thermal management components facilitate heat dissipation from the densely packed electrical devices, preventing thermal crowding even as pixel pitch decreases for higher resolution.
3Extent of automation
If active electrical elements are integrated into LED packages, then active matrix addressing is enabled, but device complexity increases
Solution Approach 1:
The patent integrates active electrical elements (driver devices, memory, signal conditioning circuits) directly into the LED package, combining multiple functional components into a single unified package. This integration enables active matrix addressing capability while reducing the overall system complexity by eliminating the need for separate discrete components and interconnections.
Solution Approach 2:
The active electrical elements integrated into the LED package are designed to perform multiple functions: driving the LED, storing control signals, conditioning signals, and enabling active matrix addressing. This multi-functionality reduces the need for separate specialized components, thereby enabling advanced addressing capabilities without proportionally increasing device complexity.
4Reliability
If bidirectional communication is implemented, then failure mitigation is improved, but device complexity increases
Solution Approach 1:
The patent implements bidirectional communication between the controller and LED packages, enabling the LED packages to send status information and feedback signals back to the controller. This feedback mechanism allows for real-time monitoring of LED performance and detection of failures, enabling proactive failure mitigation and system reliability improvement without requiring complex external monitoring systems.
Solution Approach 2:
The bidirectional communication system enables LED packages to autonomously report their operational status, detect failures, and communicate diagnostic information to the controller. This self-service capability allows the system to monitor and mitigate failures without requiring complex external diagnostic equipment, improving reliability while keeping the communication system relatively simple.
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 allows for efficient synchronization of LED pixels, reduces the complexity and cost of LED panels by enabling active matrix addressing, and mitigates failures within LED strings, thereby enhancing the performance and reliability of high-resolution LED displays.
Implementation Method 1
Light emitting diodes (LEDs) are solid-state devices that convert electrical energy to light and generally include one or more active layers of semiconductor material (or an active region) arranged between oppositely doped n-type and p-type layers. When a bias is applied across the doped layers, holes and electrons are injected into the one or more active layers where they recombine to generate emissions such as visible light or ultraviolet emissions.
Data Source
AI summary
Synchronization for light emitting diode (LED) pixels in an LED display is provided so that one or more actions of all LED pixels are able to be initiated at the same time, or within a millisecond. LED displays and corresponding systems may include a controller that is configured for sending communication signals to one or more strings of LED pixels. Active electrical elements within each LED pixel may be configured to receive the communication signals, generate corresponding synchronization signals, and respond in a manner that is coordinated with all other LED pixels in a particular LED display. Failure mitigation of LED pixel failures within an LED string is provided where the controller is configured with bidirectional communication ports for communication with the LED string. In a failure mitigation process, the bidirectional communication ports may switch directions to provide communication signals to both sides of an LED string.