LED Matrix Driving System with Sequential Group Activation
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Solution Overview
Problem
High-brightness LED matrix applications require efficient and uniform brightness control, which existing technologies struggle to achieve due to challenges in driving circuits that ensure consistent brightness adjustment across large LED matrices.
Innovation Solution
A grayscale control module and LED driving system that utilize Q-bit input terminals to adjust LED brightness through 2Q grayscale steps, with driving modules configured to turn LEDs on successively by group and row, incorporating a programmed delay time between columns to prevent inrush current and ensure uniform brightness across the matrix.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If all LEDs in the matrix are turned on simultaneously to achieve high brightness, then the brightness output is high, but inrush current increases and brightness uniformity deteriorates
Solution Approach 1:
The patent applies preliminary action by dividing LEDs into multiple groups and turning them on sequentially rather than simultaneously. The driving circuit activates each group in a predetermined sequence with controlled timing, allowing current to be distributed gradually across the LED matrix. This preliminary staged activation prevents the sudden inrush current that would occur with simultaneous switching while still achieving high overall brightness output.
2Productivity
If all LEDs are driven simultaneously to improve productivity, then the display updates faster, but current distribution becomes unbalanced and brightness uniformity decreases
Solution Approach 1:
The patent applies segmentation by dividing the LED matrix into multiple independently controllable groups. Each group can be driven with optimized current parameters tailored to its specific position and characteristics. This segmentation allows the system to maintain high update speeds by efficiently managing each segment while ensuring balanced current distribution across all groups, thereby preserving brightness uniformity throughout the entire matrix.
3Device complexity
If simple driving circuits are used to reduce device complexity, then manufacturing cost decreases, but brightness control precision and uniformity regulation capability are insufficient
Solution Approach 1:
The patent applies segmentation by dividing the LED matrix into multiple independently controllable groups, each with its own driving circuit. This allows the system to use simpler individual driving circuits for each group while collectively achieving precise brightness control across the entire matrix. Each segment can be optimized with appropriate current parameters, and the modular approach keeps individual circuit complexity manageable while maintaining overall system precision.
4Illumination intensity
If high current is applied to achieve high brightness output, then illumination intensity increases, but LED mismatches and reliability decrease
Solution Approach 1:
The patent applies preliminary action by implementing staged current application across multiple LED groups rather than applying high current to all LEDs simultaneously. Each group receives controlled current in a predetermined sequence, allowing the system to accumulate high overall brightness output while individual LEDs experience moderated current stress. This preliminary staged approach reduces thermal runout effects and minimizes mismatches between individual LEDs, improving reliability while maintaining high brightness performance.
Data Source
AI summary
A LED driving system for a LED matrix having a plurality of LEDs connected in parallel. The LED driving system includes a plurality of driving modules. Each one of the plurality of driving modules drives a corresponding one of the plurality of LEDs. The plurality of LEDs are divided into a plurality of groups. The plurality of driving modules drive the plurality of LEDs ON successively group by group. In each one of the plurality of groups, the LESs are driven ON successively row by row, and for each row in each one of the plurality of groups, the LEDs are driven ON successively column by column with a programmed delay time between the LEDs in every two successive columns. Each one of the plurality of driving modules can include a grayscale control module for adjusting a brightness of the corresponding one of the plurality of LEDs.