Display Pixel Repair Circuit with Dummy-Circuit Connection
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Solution Overview
Problem
Defective pixels in display apparatuses often result in bright or dark spots due to complex pixel circuits, making it difficult to repair and maintain display quality.
Innovation Solution
A display apparatus with a substrate structure that includes an active area and a dummy area, featuring a repair line connected to a dummy circuit, a pixel connection electrode, and a voltage transfer line, which are designed to overlap and have specific width ratios to minimize brightness differences and enable effective pixel repair.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a repair line is connected to a pixel electrode to repair a defective pixel, then the defective pixel can be restored to normal operation, but a parasitic capacitor is formed between the repair line and the pixel electrode causing brightness differences
Solution Approach 1:
A pixel connection electrode is introduced as an intermediary component between the repair line and the pixel electrode. This mediator allows electrical connection for pixel repair while physically separating the repair line from direct contact with the pixel electrode, thereby preventing the formation of a parasitic capacitor that would cause brightness differences.
Solution Approach 2:
The connection path is segmented into multiple components: the repair line, the pixel connection electrode, and the pixel electrode. This segmentation allows the repair line to be electrically connected to the pixel electrode through the intermediate pixel connection electrode without direct overlap, eliminating the parasitic capacitor formation while maintaining repair functionality.
2Reliability
If the pixel connection electrode overlaps the repair line to ensure electrical connection, then reliable connection is achieved, but the parasitic capacitor effect increases causing greater brightness differences
Solution Approach 1:
The pixel connection electrode serves as a mediator that provides reliable electrical connection between the repair line and pixel electrode while minimizing overlap. By controlling the overlap area to be smaller than that of the voltage transfer line, the connection reliability is maintained through the intermediate electrode structure without creating excessive parasitic capacitance that would cause brightness differences.
Solution Approach 2:
The overlap area parameter between the pixel connection electrode and repair line is specifically controlled to be smaller than the overlap area between the voltage transfer line and repair line. This parameter change optimizes the balance between connection reliability (sufficient overlap) and brightness uniformity (minimal parasitic capacitance).
3Power
If the voltage transfer line overlaps the repair line more than the pixel connection electrode, then voltage transfer efficiency is improved, but the parasitic capacitor coupling effect increases
Solution Approach 1:
Different overlap areas are applied to different components: the voltage transfer line has a larger overlap area with the repair line for efficient voltage transfer, while the pixel connection electrode has a smaller overlap area to minimize parasitic capacitance. This local differentiation of overlap quality optimizes both power transfer and brightness uniformity.
Solution Approach 2:
The overlap area parameter is differentially set for different conductive elements. The voltage transfer line is designed with a larger overlap area with the repair line to ensure efficient voltage transfer, while the pixel connection electrode uses a smaller overlap area to reduce parasitic capacitance coupling, thereby maintaining brightness uniformity.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution allows defective pixels to operate normally by connecting them to dummy circuits, reducing brightness variations and improving display quality by minimizing the coupling effect of parasitic capacitors.
Implementation Method 1
reducing a brightness difference depending on a voltage by reducing a coupling effect of a parasitic capacitor formed between a repair line used in a repair process and a pixel electrode
Data Source
AI summary
A display apparatus that may include a substrate that may include an active area and a dummy area, a pixel circuit in the active area and a light-emitting element electrically connected to the pixel circuit and including a pixel electrode, a dummy circuit in the dummy area, a repair line extending in a first direction over the substrate, electrically connected to the dummy circuit, and is connectable to the light-emitting element, a pixel connection electrode overlapping the repair line and electrically connected to the pixel electrode, and a voltage transfer line overlapping the repair line, spaced apart from the pixel connection electrode, and configured to transfer a voltage to the pixel circuit, wherein an area of a portion of the voltage transfer line overlapping the repair line may be greater than an area of a portion of the pixel connection electrode overlapping the repair line.