Display Panel Data Line Repair Using Common Electrode Segments
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Solution Overview
Problem
In liquid crystal display (LCD) panels, opened data lines often go undetected during assembly, leading to signal loss and display performance issues due to the need for longer repairing lines, which increase resistance and capacitance, and are limited by the number of repairing lines available, especially in narrow bezel designs.
Innovation Solution
A method that determines the location of opened data lines in relation to common electrode lines, forms a path using intersecting line segments and common electrodes to connect the data line ends, and welds them together using a laser beam, while cutting off unnecessary connections to minimize signal loss and avoid the need for additional repairing lines.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a high temperature laser beam is used to fuse the crossed overlapped region between an opened data line and a repairing line, then the opened data line can be welded to the repairing line to form a conduction path, but the resistance and capacitance of the repairing line increase, causing enhanced signal attenuation
Solution Approach 1:
The patent segments the repairing line into multiple short line segments distributed across different common electrode lines, rather than using a single long repairing line. This segmentation reduces the total resistance and capacitance of the repairing path, thereby reducing signal attenuation while maintaining the ability to repair opened data lines.
Solution Approach 2:
The patent transitions from a one-dimensional repairing line approach to a two-dimensional distribution of repairing line segments across multiple common electrode lines. By utilizing the vertical dimension (different common electrode lines) in addition to the horizontal dimension, the patent creates multiple repair paths that reduce signal loss.
2Area of stationary object
If the size of the LCD panel is increased, then the display area is improved, but the repairing line becomes longer, increasing resistance and capacitance, and the number of available repairing lines is limited
Solution Approach 1:
The patent divides the repairing function into multiple short line segments distributed across different common electrode lines, preventing the need for a single long repairing line that would cause excessive signal attenuation in large panels.
Solution Approach 2:
The patent makes common electrode lines serve dual functions: their original function of providing common electrode connections and a new function as repairing lines for opened data lines. This multi-functionality eliminates the need for dedicated repairing lines, providing unlimited repair paths across the entire panel area.
3Ease of repair
If multiple repairing lines are added to repair more data lines, then the repair capability is improved, but the production cost increases and narrow bezel design is compromised
Solution Approach 1:
The patent makes common electrode lines serve dual functions as both common electrode connections and repairing lines. This eliminates the need for separate dedicated repairing lines, reducing device complexity while maintaining or improving repair capability.
Solution Approach 2:
The patent merges the function of common electrode lines with the function of repairing lines, combining two previously separate functions into a single structural element. This reduces the total number of lines needed and simplifies the overall device structure.
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
This method reduces signal loss and eliminates limitations on data line repairs by using existing common electrode lines, maintaining display quality without introducing new lines, thus enhancing the effectiveness of data line repairs and supporting narrow bezel designs.
Implementation Method 1
using a high temperature of a laser beam passing through a underlying substrate of the array substrate to fuse a crossed overlapped region between an opened data line and the repairing line
Implementation Method 2
fuse a crossed overlapped region... to weld the opened data line and the repairing line together
Data Source
AI summary
The present invention discloses a method for repairing a display panel, in which a path for electrically connecting two ends of an opened data line at an opened part thereof is formed by using first line segments and a first common electrode, wherein each of the first line segments is a part of one of common electrode lines in the display panel intersecting the opened data line, and the first common electrode is one of a plurality of common electrodes in a pixel array that is electrically connected with the first line segments. Further, a welding process is performed at an intersecting region between the first line segments and the opened data line to form an electrical connection, and electrical connections between the path and other common electrode lines and other common electrodes outside the path are cut off. This method for repairing data lines employs existing common electrode lines and common electrodes to repair an opened data line, so that no additional repairing line needs to be disposed in the display panel to facilitate a narrow bezel design of the display panel and thus repairing the data lines is no longer limited by the number of the repairing lines. Furthermore, the influence on data signals is negligible because no new line is introduced.