Active-Matrix LED Pixel Packages for Small-Pitch Displays
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Solution Overview
Problem
Conventional LED display technologies face challenges in achieving small pixel pitches while maintaining high efficiency and reducing complexity and cost, particularly due to thermal crowding and increased density of driver electronics.
Innovation Solution
The implementation of active electrical elements within LED packages, which include volatile and non-volatile memory, driver elements, and signal conditioning components, allows for active matrix addressing and independent control of LED pixels, reducing the need for complex driver circuits and improving thermal management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If pixel pitch is reduced to increase display resolution, then image quality is improved, but thermal crowding and driver electronics density increase
Solution Approach 1:
The patent segments the driver electronics functionality by integrating memory elements directly within each LED pixel package. This distributes the control functionality across individual pixels rather than concentrating driver circuits on separate boards, reducing thermal density in any single location while enabling smaller pixel pitches.
Solution Approach 2:
The patent moves driver electronics from a two-dimensional plane (separate driver board) into the third dimension by integrating memory and control elements within the LED pixel package itself. This vertical integration reduces the footprint and thermal crowding on the display surface while maintaining high resolution.
2Manufacturing precision
If pixel pitch is reduced to increase display resolution, then image quality is improved, but driver electronics complexity and cost increase
Solution Approach 1:
The patent merges the memory function and LED driver functionality into a single integrated package with each LED pixel. This consolidation eliminates the need for separate driver boards and complex interconnections, reducing overall device complexity and manufacturing cost while enabling higher resolution displays.
Solution Approach 2:
The integrated memory element within each LED pixel package serves multiple functions: storing pixel data, controlling LED brightness, and managing color output. This multi-functionality reduces the need for separate control circuits for each pixel, simplifying the overall driver electronics architecture.
3Device complexity
If conventional passive matrix addressing is used, then device complexity is reduced, but light utilization efficiency decreases
Solution Approach 1:
The patent implements active matrix addressing where each LED pixel package includes memory that actively maintains the pixel state between updates. This feedback mechanism allows precise control of each pixel independently, significantly improving light utilization efficiency by eliminating the need for continuous refreshing that wastes energy in passive matrix systems.
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 LED displays with smaller pixel pitches, improved light utilization efficiency, reduced thermal issues, and lower production costs by simplifying the driver electronics and enhancing the operational stability of LED pixels.
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
Data Source
AI summary
Active control of light emitting diodes (LEDs) and LED packages within LED displays is disclosed. LED packages are disclosed that include a plurality of LED chips that form at least one LED pixel for an LED display. Each LED package may include an active electrical element that is configured to receive a control signal and actively maintain an operating state, such as brightness or grey level while other LED packages are being addressed. Active electrical elements may include active circuitry that includes one or more of a driver device, a signal conditioning or transformation device, a memory device, a decoder device, an electrostatic discharge (ESD) protection device, a thermal management device, and a detection device, among others. In this regard, each LED pixel of an LED display may be configured for operation with active matrix addressing.