Display Substrate Dual Driving Arrays Defect Repair
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Solution Overview
Problem
Current display device manufacturing technologies result in high waste due to defects in conductive wires or electronic elements, as there is no effective mechanism to repair these defects without damaging the light emitting elements or the substrate, leading to the entire substrate being discarded even if the light emitting elements are intact.
Innovation Solution
A display device structure with at least two driving arrays connected in parallel, including transistors and capacitors, and a conductive element like a zero-ohm resistor or Zener diode, which allows for selective electrical connection to a qualified driving array, enabling the light emitting element to function even if one driving array is defective, thereby increasing yield and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If inspection of electronic elements is performed after manufacturing, then defects can be detected, but the entire substrate must be discarded if any defect occurs, resulting in waste of light emitting elements
Solution Approach 1:
The substrate is divided into multiple independent regions, each with its own driving array. This segmentation allows defective regions to be isolated and discarded individually, while intact regions with functional light emitting elements can be salvaged and reused, thereby reducing waste of light emitting elements while maintaining defect detection capability
Solution Approach 2:
Redundant driving arrays are prepared in advance on the substrate. When a defect is detected in one driving array, the redundant arrays can take over to drive the light emitting elements, providing a backup mechanism that prevents total substrate discard and reduces material waste
2Reliability
If redundant driving arrays are added to enable repair of defective circuits, then yield and stability are improved, but device complexity increases
Solution Approach 1:
The display substrate is segmented into multiple independent driving arrays that can operate autonomously. Each driving array is a complete functional unit that can independently drive light emitting elements, allowing simple isolation of defective units without complex repair mechanisms
Solution Approach 2:
Switching circuits serve as intermediaries between the multiple driving arrays and the light emitting elements. These switching circuits enable simple selection and isolation of defective driving arrays without requiring complex repair mechanisms, maintaining system reliability while controlling complexity
Data Source
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AI summary
A display device (100) includes a substrate (1021), at least one light emitting element (LE) and at least two driving arrays (DA1, DA2). The at least one light emitting element (LE) is disposed on the substrate (1021), and the at least one light emitting element (LE) has a first terminal (LEI) and a second terminal (LE2). The at least two driving arrays (DA1, DA2) are disposed on the substrate (1021), and one of the at least two driving arrays (DA1, DA2) is electrically connected to the first terminal (LEI) of the at least one light emitting element (LE).