Display Panel Repair Circuits for Defective Pixel Driving Rows
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Solution Overview
Problem
Defective pixel driving circuits in self-luminous display panels result in display defects due to inability to drive light-emitting elements correctly, affecting the display effect.
Innovation Solution
Incorporation of repair lines and repair driving circuits with capacitors and transistors to supply power to light-emitting elements, allowing for electrical connection through laser irradiation or manufacturing integration, enabling pixel repair.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If pixel driving circuits are integrated within the display panel to drive light-emitting elements, then the display functionality is achieved, but display defects occur when pixel driving circuits become defective
Solution Approach 1:
The patent divides the driving function into separate components: normal pixel driving circuits for regular operation and repair driving circuits for defect correction. This segmentation allows independent functionality where repair circuits can be activated only when needed, without interfering with normal pixel operation. The repair lines are also segmented to connect only to specific light-emitting elements that require repair, enabling targeted correction without affecting the entire display panel.
Solution Approach 2:
The repair driving circuits and repair lines are pre-configured within the display panel during manufacturing, but remain inactive during normal operation. This preliminary action ensures that repair capabilities are ready in advance without adding operational complexity. When a pixel driving circuit defect is detected, the repair function is already in place and can be immediately activated by switching signals, eliminating the need for additional repair infrastructure.
2Ease of repair
If repair driving circuits and repair lines are added to correct defective pixels, then display defects are corrected, but the device structure becomes more complex
Solution Approach 1:
The repair driving circuits are designed to perform multiple functions: they can drive light-emitting elements during normal operation and switch to repair mode when defects are detected. The same repair driving circuit can serve multiple repair lines, and the repair lines can connect to different light-emitting elements based on defect location. This multi-functionality reduces the overall number of dedicated repair components needed, simplifying the structure while maintaining comprehensive repair capability.
Solution Approach 2:
The patent introduces switching signals and control circuits as intermediaries between the normal pixel driving circuits and the repair driving circuits. These intermediaries manage the transition between normal and repair modes without requiring direct complex interconnections between all components. The switching mechanism acts as a mediator that routes signals appropriately based on defect detection, reducing the complexity of direct circuit-to-circuit connections.
3Reliability
If capacitor area is increased in repair driving circuits to ensure proper light emission, then light emission reliability is improved, but the area occupied by repair circuits increases
Solution Approach 1:
The patent applies different capacitor area allocations based on local requirements: repair driving circuits that control multiple light-emitting elements are assigned larger capacitors to ensure sufficient charge storage for multiple emissions, while repair circuits for single elements use smaller capacitors. This local quality approach optimizes the capacitor-to-light-emitting-element ratio, ensuring each repair circuit has just enough capacitance for its specific function without excessive area occupation.
Solution Approach 2:
The patent varies capacitor parameters (area, capacitance value) based on the specific repair requirements of different light-emitting elements. By adjusting these parameters according to local needs rather than using uniform capacitor sizes throughout, the system achieves reliable light emission where needed while minimizing total capacitor area. This parameter optimization allows smaller capacitors in less critical positions and larger capacitors only where necessary for proper repair function.
Data Source
AI summary
A display panel, a pixel repair method, and a display apparatus. The display panel includes N1 pixel driving circuit rows arranged along a first direction and located on a side of a substrate, repair lines, and repair driving circuits. Each of the pixel driving circuit rows includes a plurality of pixel driving circuits arranged along a second direction. Along a direction perpendicular to a plane where the substrate is located, each of the repair lines at least partially overlaps with one of the repair driving circuits and also the pixel driving circuits. Each of the repair driving circuit includes a repair circuit including at least two transistors and a second capacitor, and a first capacitor. A capacitance of the first capacitor is greater than or equal to a capacitance of the second capacitor. A number of first capacitors is N2, both N1 and N2 are positive integers, and N2<2N1.