LED Display Module Row-Scanning Architecture Reduces Terminal Count
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Solution Overview
Problem
Conventional LED display modules with single-pixel packages face challenges in achieving high-quality resolution due to the large number of terminals required for each pixel, leading to increased complexity and cost in substrate design and interconnection, particularly as pixel density increases.
Innovation Solution
The implementation of multi-pixel packages with common anode terminals connected in rows and individual cathode terminals, allowing for efficient scanning and reduced terminal count, enabling more flexible circuit design and improved interconnection on substrates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If single-pixel packages with multiple terminals are used to achieve high resolution, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The pixel array is segmented into multiple scan lines, with each scan line containing multiple pixels. By grouping pixels along the row direction and applying common anode signals to entire scan lines, the terminal count per pixel is reduced from 4 to 2, while maintaining the ability to individually control each pixel through column-specific cathode terminals.
Solution Approach 2:
Multiple anode terminals that would traditionally be required for each pixel are merged into common anode terminals that serve entire scan lines. This merging reduces the total terminal count and simplifies the interconnection structure on the substrate while preserving pixel-level control capability.
2Measurement precision
If single-pixel packages with four terminals are used to achieve intended LED pitches, then measurement precision is improved, but ease of manufacture deteriorates
Solution Approach 1:
The substrate circuit is segmented into row-wise common signal lines and column-wise individual control lines. This segmentation allows for standardized, repetitive circuit patterns that are easier to manufacture while maintaining precise LED pitch control through the systematic arrangement of common and individual terminals.
Solution Approach 2:
The terminal configuration parameters are changed from 4 terminals per pixel to 2 terminals per pixel (common anode + individual cathode). This parameter change simplifies the substrate circuit design and manufacturing process while maintaining the ability to achieve intended LED pitches through the common-anode scanning architecture.
3Measurement precision
If single-pixel packages are arrayed to reduce pixel density, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The interconnection structure is simplified by merging multiple anode connections into common anode terminals that serve entire scan lines. This merging reduces the complexity of interconnection structures on the substrate while maintaining precise pixel density control through the systematic arrangement of pixels in the matrix.
Data Source
AI summary
An LED display module is disclosed. The LED display module includes a substrate; a plurality of multi-pixel packages arrayed in a matrix with rows and columns, respectively, each of the multi-pixel packages including a package substrate and two or more pixels located on the package substrate and each of the pixels including a red LED chip, a green LED chip, and a blue LED chip; and a driver IC adapted to independently control the pixels of the multi-pixel packages. Anode terminals of the LED chips in the pixels adjacent in the row direction are connected in common to one another such that the pixels are scanned in rows in response to scan signals.