Array Substrate Extension Sections for Broken Line Repair
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Solution Overview
Problem
The existing array substrates for liquid crystal display panels face challenges in repairing broken signal lines, leading to reduced conformity rates due to limited repair options, signal delay, and the inability to repair both data and gate lines effectively.
Innovation Solution
The array substrate design includes extension sections connected to gate lines and pixel electrodes, allowing for bypassing broken lines by electrically connecting the pixel electrodes through these sections, and the use of hollowed-out regions for facilitating cutting and fusion processes, enabling effective repair of both data and gate lines without affecting signal transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If traditional repair methods are used for broken signal lines, then the repair process is limited, but the conformity rate is reduced due to inability to repair both data and gate lines effectively
Solution Approach 1:
The gate line is designed to serve dual functions: its original function of controlling TFT switching and a repair function for bypassing broken data lines. By making the gate line multi-functional, the system can repair both data line breaks and gate line breaks using the same extension section structure, significantly improving repair versatility and conformity rate without requiring different repair methods for different line types.
Solution Approach 2:
The gate line is segmented into multiple sections by introducing extension sections that are electrically connected to the main gate line. These segmented portions can be independently controlled - the main gate line remains functional while extension sections are used for repair purposes, allowing the gate line to serve both its original control function and the additional repair function simultaneously.
2Ease of repair
If extension sections are added to gate lines for repair, then repair flexibility is improved, but device complexity increases
Solution Approach 1:
The extension sections are merged with the existing gate line structure and share the same conductive layer (gate electrode layer). Instead of adding completely separate repair structures, the extension sections are integrated into the gate line's own material system, reducing the number of additional layers and structures needed while still providing the required repair functionality.
Solution Approach 2:
The extension sections serve multiple purposes: they extend the gate line's electrical connection capability and simultaneously provide a bypass path for repairing broken data lines. This multi-functionality reduces the need for separate dedicated repair structures, thereby limiting the increase in device complexity while maintaining high repair flexibility.
3Reliability
If pixel electrodes are used for bypassing broken lines, then signal transmission is maintained, but signal delay occurs
Solution Approach 1:
The extension sections serve as intermediary conductive structures that provide a direct electrical path between the gate line and the pixel electrode bypass area. By using these dedicated intermediary structures rather than forcing signal through the pixel electrode's intended capacitance path, the signal transmission maintains lower impedance and reduced delay while still achieving the bypass function.
Data Source
AI summary
The present disclosure provides an array substrate and a method for repairing broken lines thereof, and a display device. The array substrate includes: a base substrate; a plurality of gate lines and a plurality of data lines located on the base substrate, the plurality of gate lines intersecting with the plurality of data lines to define a plurality of pixel units arranged in an array; a thin film transistor and a pixel electrode located in each pixel unit; a plurality of extension sections connected to at least one of the gate lines; the pixel electrodes being in one-to-one correspondence with the plurality of extension sections, and an orthographic projection of each of the plurality of extension sections on the base substrate at least partially overlapping an orthographic projection of a corresponding pixel electrode on the base substrate.