Pixel Sensing Transistor Alignment Detection
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Solution Overview
Problem
Existing display devices face challenges in accurately sensing the alignment state of subminiature light emitting elements with nanoscale sizes, leading to potential defects in electrical connections and misalignment, which affects the reliability and efficiency of the display panel.
Innovation Solution
A pixel and display device design incorporating a sensing transistor, a control transistor, and a pixel circuit that allows for the detection of current flow direction and number of light emitting elements, using a sensing unit with an amplifier and variable resistor to determine the alignment state of light emitting elements, enabling adaptive driving direction and identifying defective alignments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If light emitting elements are aligned manually or by simple automated processes, then device complexity is reduced, but manufacturing precision deteriorates due to misalignment and incorrect electrical connections
Solution Approach 1:
The patent applies preliminary action by incorporating a sensing transistor and sensing unit that detect the alignment state of light emitting elements before final electrical connection is established. This allows misaligned elements to be identified and corrected in advance, preventing defective connections while maintaining manufacturing precision without requiring overly complex real-time adjustment systems.
Solution Approach 2:
The patent implements feedback through a sensing unit that monitors the alignment state of light emitting elements and provides information to a control system. This feedback mechanism enables the system to detect misaligned elements and adjust the alignment process accordingly, improving manufacturing precision while keeping the overall device complexity manageable through intelligent control rather than mechanical complexity.
2Reliability
If all light emitting elements are electrically connected without verification, then productivity increases, but reliability deteriorates due to undetected misalignments and defective connections
Solution Approach 1:
The patent applies preliminary action by performing alignment verification through the sensing transistor before final electrical connection is completed. This allows defective connections to be identified and corrected in advance, ensuring high reliability of electrical connections while minimizing rework and ensuring smooth production flow, thus maintaining productivity.
Solution Approach 2:
The patent implements feedback through the sensing unit that provides real-time information about alignment status to the control system. This enables selective connection of only properly aligned elements, ensuring high reliability while avoiding unnecessary rework on defective elements, thereby maintaining overall production efficiency.
3Measurement precision
If sensing transistors are added to detect alignment state, then measurement precision improves, but device complexity increases due to additional circuit components
Solution Approach 1:
The patent applies universality by designing the sensing transistor to serve multiple functions: detecting alignment state, enabling adaptive driving mode selection, and providing feedback for quality control. This multi-functionality allows high measurement precision to be achieved without proportionally increasing device complexity, as the same sensing infrastructure supports multiple operational modes and quality assurance functions.
Solution Approach 2:
The patent implements parameter changes by utilizing the sensing transistor's electrical characteristics (such as threshold voltage and current flow) to detect alignment state. By monitoring changes in electrical parameters rather than requiring complex mechanical sensing structures, the patent achieves high measurement precision while keeping the device complexity relatively low through simple electrical measurements.
4Loss of information
If misaligned light emitting elements are not detected, then ease of operation is maintained, but loss of information increases due to undetected defects affecting display quality
Solution Approach 1:
The patent applies self-service by designing a sensing system that automatically detects alignment defects without requiring manual inspection or complex external verification equipment. The sensing transistor and sensing unit autonomously monitor the alignment state and provide feedback to the control system, ensuring comprehensive defect detection while maintaining ease of operation through automated processes.
Solution Approach 2:
The patent implements feedback through the sensing unit that continuously monitors alignment status and communicates defect information to the control system. This automated feedback mechanism ensures that no alignment defects go undetected while maintaining ease of operation, as the system self-monitors and reports issues without requiring manual verification steps.
Data Source
AI summary
A pixel comprising a light emitting unit comprising at least one light emitting element; a pixel circuit for supplying current to the light emitting in response to a data signal; a sensing transistor electrically connected between a data line and a first node that is a common node of the light emitting unit and the pixel circuit; and a control transistor electrically connected between a scanning line and a gate electrode of the sensing transistor.