Display Substrate Electrostatic Dispersion Lines
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Solution Overview
Problem
During the manufacture of liquid crystal display panels, static electricity can cause short circuits and corrosion of conductor lines, leading to increased manufacturing costs and complexity due to the need for additional processes to prevent static electricity and eliminate laser trimming processes.
Innovation Solution
A display substrate with a signal line, test switch, test pad, and first electrostatic dispersion line is designed, where the electrostatic dispersion lines connect the test pad to an electrical shorting bar to disperse electric charges, preventing static electricity from damaging the substrate and simplifying manufacturing processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a diamond cutting process is used to separate the test signal line from the gate line and source line, then the test signal line can be separated to enable visual inspection, but pollutants are generated during cutting and conductor lines exposed due to cutting may corrode
Solution Approach 1:
The patent extracts the test signal line from the gate line and source line by creating a test switching element that selectively connects to the signal line during inspection. This allows the test signal line to be separated functionally without requiring physical cutting, thereby eliminating pollutant generation and conductor exposure issues while maintaining visual inspection capability
Solution Approach 2:
The patent introduces a test switching element as an intermediary component between the signal line and the test pad. This switching element acts as a mediator that enables the test signal to be applied to the signal line during inspection without requiring physical separation through cutting, thus avoiding the harmful effects of the diamond cutting process
2Measurement precision
If laser trimming process is used to separate the test signal line from the gate line and source line, then the test signal line can be separated, but additional processes are required to manufacture the display substrate
Solution Approach 1:
The patent merges the test signal line separation function with the existing test switching element formation process. By integrating the separation function into the standard manufacturing steps (forming the test switching element and connecting it to the signal line), the patent eliminates the need for separate laser trimming or diamond cutting processes, thereby reducing manufacturing complexity while maintaining inspection accuracy
3Reliability
If additional processes are added to prevent static electricity, then static electricity damage can be prevented, but manufacturing costs and processes increase
Solution Approach 1:
The patent makes the test switching element serve multiple functions: it acts as both the test signal application switch and the electrostatic dispersion pathway. By connecting the test pad to the signal line through the test switching element, the patent simultaneously enables visual inspection and provides a route for static electricity to disperse, eliminating the need for separate anti-static processes while improving reliability
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 electrostatic dispersion lines effectively prevent static electricity from causing damage, improving product reliability and reducing manufacturing complexity by dispersing electric charges across a large area, thus enhancing the reliability of the display substrate and simplifying the manufacturing process.
Implementation Method 1
the first electrostatic dispersion lines may connect the test pad electrode of the test pad to the electrical shorting bar so that the electrical shorting bar may disperse the electric charges inflowing from the test pad into a large area to prevent static electricity from being generated
Data Source
AI summary
A display substrate includes a signal line, a test switch, a test pad, and a first electrostatic dispersion line. The signal line is formed in the display area of a base substrate. The test switch is formed in a peripheral area of the base substrate surrounding the display area. The test switch applies a test signal to the signal line. The test pad is electrically connected to the test switch and receives the test signal. The first electrostatic dispersion line is extended from the test pad to an end of the base substrate.