Local Passive Matrix Display Driver Architecture
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Solution Overview
Problem
Existing display technologies face challenges in efficiently driving micro LEDs (μLEDs) due to limitations in silicon area and cost, particularly in passive matrix displays, where direct-drive approaches consume more silicon area and peak panel current, and lack flexibility in design and redundancy.
Innovation Solution
The implementation of local passive matrix (LPM) displays using small silicon pixel driver chips that distribute current among LEDs, incorporating pulse width modulation (PWM) for efficient grey level generation, and employing redundant pixel driver chips for redundancy and flexibility in design, including curved edges and tiled displays.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If direct-drive approach is used in passive matrix displays, then each pixel element can be individually driven, but silicon area and peak panel current consumption increase
Solution Approach 1:
The display is divided into multiple blocks, with each block containing a subset of pixel elements that share common row and column drivers. This segmentation allows the passive matrix structure to achieve individual pixel control capability while reducing the silicon area required compared to a full direct-drive approach, as each block can be independently addressed through its shared drivers.
2Adaptability or versatility
If redundant pixel driver chips are employed, then design flexibility and redundancy improve, but device complexity increases
Solution Approach 1:
The pixel driver chips are designed with universal functionality to operate in multiple configurations - they can serve as primary drivers, redundant backups, or be arranged in various patterns (curved edges, tiled displays, cutouts). This multi-functionality provides design flexibility and redundancy without proportionally increasing device complexity, as the same basic driver architecture serves multiple purposes.
3Shape
If distributed row driver chips are arranged among pixel driver chips, then curved edges and reduced borders are achieved, but manufacturing complexity increases
Solution Approach 1:
The distribution of row driver chips among pixel driver chips creates a flexible, adaptable architecture that can be dynamically configured to achieve curved edges and reduced borders. This dynamic arrangement allows the display to adapt to various shape requirements while maintaining a systematic manufacturing approach, as the distributed architecture follows predictable patterns that can be incorporated into standard fabrication processes.
Data Source
AI summary
Local passive matrix displays and methods of operation are described. In an embodiment, the display includes a pixel driver chip coupled with a matrix of rows and columns of LEDs. The pixel driver chips may be arranged in rows across the display with separate portions to operate separate matrices of LEDs.