Active LED Display Control with Segmented PWM Duty Cycles
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Solution Overview
Problem
Conventional LED displays face challenges with high complexity and cost due to densely populated driver electronics and thermal crowding as pixel pitches decrease, especially in high-resolution displays, leading to increased thermal issues and complexity.
Innovation Solution
Implementing active electrical elements in LED packages that allow for segmented duty cycles in pulse width modulation (PWM) to enhance control of LED operation, enabling active matrix addressing and reducing the need for continuous electrical activation, thereby reducing thermal crowding and complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If pixel pitch is decreased to achieve higher resolution displays, then display resolution is improved, but thermal crowding and device complexity increase
Solution Approach 1:
The patent segments the driver electronics functionality by integrating active electrical elements (such as memory cells and switching transistors) directly into each LED package. This distributes the control functionality across numerous small units rather than concentrating it in dense driver circuits, thereby maintaining high resolution while reducing thermal crowding and overall device complexity.
2Manufacturing precision
If pixel pitch is decreased to achieve higher resolution displays, then display resolution is improved, but thermal stress increases
Solution Approach 1:
By segmenting the display into independently controllable LED packages with integrated active elements, the patent reduces the concentration of electrical devices in any single area. This segmentation distributes heat generation across many small, spaced-out units rather than concentrating it in dense driver regions, thereby reducing thermal stress while maintaining high resolution.
Solution Approach 2:
The patent employs pulse width modulation (PWM) with segmented duty cycles to control LED activation. By periodically activating and deactivating LEDs in segmented patterns rather than continuous operation, the system reduces cumulative thermal stress while maintaining display resolution and performance.
3Device complexity
If active electrical elements are integrated into LED packages for active matrix addressing, then device complexity is reduced, but manufacturing complexity increases
Solution Approach 1:
The patent merges the LED light-emitting function with active electrical control elements (memory cells, switches) into a single integrated LED package. This consolidation eliminates the need for separate dense driver electronics boards and reduces overall device complexity, while the integrated structure can be manufactured using standardized semiconductor processes.
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 enables higher resolution displays with reduced thermal stress and lower complexity by allowing LEDs to be activated and deactivated multiple times within a PWM period, maintaining operating states without continuous electrical activation, thus improving display performance and reducing costs.
Implementation Method 1
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
Active control of LEDs, LED packages, and related LED displays by way of pulse wide modulation (PWM) is disclosed. Effective PWM frequencies for LEDs are increased by segmenting duty cycles in which LEDs are electrically activated within individual PWM periods. Segmented duty cycles may be provided by transforming or re-ordering a sequence in which control signals are provided to LEDs. As such, LEDs may be electrically activated and deactivated multiple times within each PWM period. Active electrical elements that are incorporated into one or more LED packages of an LED display may be capable of segmenting the duty cycle within each LED package. Active electrical elements may also be capable of receiving reset signals from a data stream to either initiate a reset action or pass the reset signals along to other active electrical elements of a display.