LCD Data Line Repair Structure Using Gate Chip Routing
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Solution Overview
Problem
Conventional data line repair structures for liquid crystal displays are inadequate for chip-on-glass or thin film-on-glass structures, as they require X and Y sides of printed circuit boards, which are not conserved in these configurations, leading to inefficiencies in repairing broken data lines.
Innovation Solution
A data line repair structure comprising multiple repair lines (first, second, and third repair lines) that allow data signals to be transmitted through these lines when a data line is broken, using a laser beam to weld the repair lines with the data line and utilizing transparent conductive layers and flexible boards to bypass broken points, enabling signal transmission across the repair lines.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional data line repair structure using X and Y sides of printed circuit boards is used, then data line repair is achieved, but it cannot be applied to chip-on-glass or thin film-on-glass structures where X and Y sides are not conserved
Solution Approach 1:
The patent introduces a Z-dimensional repair path by routing the data signal through the gate driving chip's internal circuitry (vertical dimension) instead of relying solely on X-Y plane connections on printed circuit boards. The repair path utilizes the gate driving chip as an intermediate node, creating a three-dimensional signal transmission route that bypasses the broken data line without requiring external X and Y side connections.
Solution Approach 2:
The gate driving chip is assigned a dual function: its original function of generating gate signals is supplemented with a repair function by utilizing its internal circuitry to transmit data signals during repair mode. This multi-functionality allows the same chip structure to serve both normal operation and repair purposes, enabling the repair solution to work across different display structures including chip-on-glass configurations.
2Area of stationary object
If chip-on-glass or thin film-on-glass structure is used to conserve X and Y sides of printed circuit boards, then space is saved, but conventional repair methods cannot be applied
Solution Approach 1:
The patent introduces a Z-dimensional repair path by routing the data signal through the gate driving chip's internal circuitry (vertical dimension) instead of relying solely on X-Y plane connections on printed circuit boards. The repair path utilizes the gate driving chip as an intermediate node, creating a three-dimensional signal transmission route that bypasses the broken data line without requiring external X and Y side connections.
Solution Approach 2:
The gate driving chip serves as an intermediary device in the repair path, mediating between the source driving chip and the pixel electrode. By introducing this intermediate node, the patent enables signal transmission through an alternative route that does not require direct X-Y plane connections, thus making repair possible in compact chip-on-glass structures while maintaining space efficiency.
3Reliability
If laser beam welding is used to connect repair lines with data line, then reliable electrical connection is achieved, but additional manufacturing steps are required
Solution Approach 1:
The patent replaces traditional mechanical or chemical welding methods with laser beam welding to join the repair lines with the data line. This substitution provides more reliable electrical connections through precise, localized melting and fusion, ensuring low-resistance joints. Although it adds a manufacturing step, laser welding offers superior connection reliability compared to conventional methods, particularly for fine-pitch interconnects in display panels.
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
Enables effective data signal transmission across broken data lines in liquid crystal display panels, particularly in chip-on-glass or thin film-on-glass structures, by using a network of repair lines to bypass defects, ensuring continuous operation of the display.
Implementation Method 1
a laser beam can be implanted to weld first repair line 109, second repair line 110 and data line 102 to form two connecting points 112a and 112b
Data Source
AI summary
A data line repair structure for a liquid crystal display panel. The data line repair structure includes a first repair line parallel to a scan line and crossing the first end of a data line; a second repair line parallel to the data line and connected to a gate driving chip; and a third repair line parallel to the scan line and crossing the second end of the data line. When the data line has a broken point, the source driving chip transmits a data signal to a pixel electrode through the first repair line, the second repair line, and the third repair line.