OLED Pixel Repair Structures for Parasitic Capacitance Compensation
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Solution Overview
Problem
In OLED display panels, defective pixel circuits lead to display defects due to the inability to drive light-emitting devices, resulting in uneven parasitic capacitance on signal lines, which affects display brightness and uniformity.
Innovation Solution
The implementation of pixel repair structures, including second pixel circuits, repair assemblies, and compensation structures that pre-compensate parasitic capacitance on signal lines, allowing for the effective repair of defective pixels by coupling repair lines to signal lines and light-emitting devices, ensuring uniform signal delay and improved display quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If pixel repair structures are added to repair defective pixels, then display uniformity and brightness are improved, but device complexity increases due to additional repair assemblies and compensation structures
Solution Approach 1:
The repair line is nested within the signal line by having the repair line overlap with the signal line in the vertical direction. This allows the repair structure to be integrated into the existing signal line pathway without requiring separate routing, thus adding repair functionality while minimizing increase in device complexity
Solution Approach 2:
The patent transitions from a planar two-dimensional layout to a three-dimensional stacked architecture by placing the repair line in a different layer that overlaps vertically with the signal line. This dimensional change allows the repair structure to coexist with the signal line without increasing lateral footprint or routing complexity
Data Source
AI summary
A display panel, a method for repairing the same, and a display apparatus are provided. The display panel includes pixels, signal lines, and pixel repair structures. The pixel includes a first pixel circuit and a light-emitting device. The signal line extends in a first direction and is coupled to the first pixel circuit. The pixel repair structures include second pixel circuits, first and second repair assemblies, and first compensation structures. The first compensation structures and the signal lines are in one-to-one correspondence. The first repair assembly partially overlaps at least one signal line. The second repair assembly partially overlaps at least one light-emitting device. The first repair assembly includes a first repair line coupled to a first input terminal of the second pixel circuit. An output terminal of the second pixel circuit is coupled to at least one second repair line of at least one second repair assembly.