Dummy Pixel Repair Circuit for Display Defect Compensation
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Solution Overview
Problem
Defective pixels in display apparatuses often result in bright or dark spots, making it difficult to repair them, which affects production efficiency and quality.
Innovation Solution
Incorporating dummy pixels and repair lines that allow for the coupling and initialization of defective pixels, using transistors and capacitors to generate a driving current and compensate for threshold values, enabling the repair of defective pixels by mimicking the operation of normal pixels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If defective pixels are left unrepaired, then the display apparatus can be manufactured quickly, but the quality of the display deteriorates due to bright or dark spots
Solution Approach 1:
The patent applies preliminary action by pre-configuring repair lines and dummy pixels during the manufacturing process before the display apparatus is completed. The repair lines are established in advance, allowing defective pixels to be repaired during initialization without interrupting the manufacturing flow, thus maintaining high productivity while ensuring display quality.
Solution Approach 2:
The patent implements self-service by enabling the display apparatus to automatically repair its own defective pixels during the initialization phase. The repair mechanism uses the existing pixel circuits and repair lines to self-correct defects without requiring external intervention or manual repair processes, thereby maintaining production throughput while improving display quality.
2Reliability
If repair lines and dummy pixels are added to enable defective pixel repair, then display quality improves, but the device complexity increases
Solution Approach 1:
The patent applies universality by designing the repair lines and dummy pixels to serve multiple functions. The repair lines can be used for both normal signal transmission and defective pixel repair, while dummy pixels serve as both test elements and repair sources. This multi-functionality reduces the need for separate dedicated repair circuits, thereby limiting the increase in device complexity while improving repair capability.
Solution Approach 2:
The patent uses parameter changes by modifying the operational states of existing circuits rather than adding fundamentally new components. The repair mechanism changes the voltage levels, timing sequences, and activation states of transistors and capacitors during initialization to enable repair functionality. This approach allows defective pixel repair capability to be added by changing operational parameters rather than significantly increasing structural complexity.
3Ease of repair
If complex pixel circuits are used to enable repair functionality, then defective pixels can be repaired, but the ease of manufacture decreases
Solution Approach 1:
The patent applies segmentation by dividing the repair functionality into discrete, modular components that can be independently manufactured and tested. The repair lines are segmented into individual line segments, and dummy pixels are positioned at specific intervals. This segmentation allows for standardized manufacturing processes and simplifies the integration of repair functionality without requiring complex custom circuits for each pixel.
Solution Approach 2:
The patent uses copying by replicating the basic pixel circuit structure in the dummy pixels and using standardized repair line designs. Instead of creating unique complex circuits for each repair scenario, the patent copies the essential circuit elements and configurations, allowing for easier manufacturing through repetition and standardization of proven designs.
Data Source
AI summary
A display apparatus includes: pixels at a display area; dummy pixels at a dummy area; and repair lines coupled to the dummy pixels and connectably arranged to the pixels, each of the dummy pixels including: a driving transistor configured to output a driving current corresponding to a data signal applied to a gate electrode thereof; an emission control transistor between a connection node of a corresponding repair line of the repair lines and the driving transistor, configured to be controlled by an emission control signal; a bypass transistor between the connection node and a first initialization voltage line through which a first initialization voltage is supplied, configured to be controlled by an initialization control signal; and a coupling removal transistor between the connection node and the first initialization voltage line, configured to be controlled by a coupling control signal applied at a different timing from the initialization control signal.