Shorting Bars for LCD Scanning Line Open-Circuit Detection
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Solution Overview
Problem
The Half Source Double Gate (HSD) design in LCD panels faces challenges in accurately detecting open-circuit defects in scanning lines due to capacitance effects between closely spaced scanning lines, which interferes with signal detection.
Innovation Solution
The method involves forming shorting bars that connect odd-numbered or even-numbered scanning lines to prevent capacitance effects by creating electrical connections between them, allowing for accurate open-circuit detection without interference, and subsequently disconnecting these connections for short-circuit detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the number of scanning lines is reduced by half in HSD design, then the cost is reduced and manufacturing is simplified, but the distance between adjacent scanning lines becomes too close causing capacitance effects that interfere with open-circuit detection
Solution Approach 1:
The patent applies preliminary action by forming shorting bars between adjacent scanning lines before the detection process. These shorting bars are created during the manufacturing process (e.g., through photolithography and etching) to establish electrical connections that prevent capacitance effects during subsequent open-circuit detection, thereby enabling accurate detection in the HSD design with reduced scanning lines
Solution Approach 2:
The shorting bars act as intermediary elements between adjacent scanning lines. By introducing these intermediate conductive structures, the patent eliminates the harmful capacitance coupling effect while maintaining the simplified HSD scanning line configuration, thus resolving the detection accuracy issue without changing the fundamental design architecture
2Measurement precision
If shorting bars are formed to connect scanning lines and eliminate capacitance effects, then detection accuracy is improved, but additional manufacturing steps and structural complexity are introduced
Solution Approach 1:
The patent merges the shorting bar formation with the existing scanning line fabrication process. Both the scanning lines and shorting bars are formed using the same photolithography and etching steps, integrating the capacitance elimination feature into the standard manufacturing flow rather than adding separate complex processes
Solution Approach 2:
The shorting bars serve multiple functions: they eliminate capacitance effects during detection, provide electrical connections between scanning lines, and can be removed later through selective etching if needed. This multi-functionality reduces the need for additional specialized structures or processes
3Productivity
If shorting bars are removed after detection, then the display panel can be manufactured, but additional etching steps and process control are required
Solution Approach 1:
The shorting bars are designed as temporary structures that are formed during detection but are subsequently removed through selective etching. This approach allows the detection process to benefit from the shorting bars while the final display panel does not require them, and the removal process is integrated into the standard manufacturing sequence
Solution Approach 2:
The patent uses selective etching processes that change the removal parameters for shorting bars versus permanent structures. By controlling etching selectivity and parameters, the shorting bars are removed while preserving other critical structures, enabling process integration without requiring separate complex removal steps
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 approach enhances the accuracy of open-circuit detection and manufacturing yield by eliminating capacitance interference, reducing the need for rework and associated costs in the LCD panel production process.
Implementation Method 1
because the distance of the two scanning lines between two adjacent rows of sub-pixels is too close, when the second scanning line is circuit-opening, a capacitance effect is formed between the second scanning line and the third scanning line
Implementation Method 2
A non-contact array test involves adding a signal to one end of a scanning line, receiving the signal at the other end, and detecting whether the scanning line is circuit-opening with the change of the signal
Data Source
AI summary
A method of manufacturing a display panel comprises a first substrate is manufactured, a plurality of scanning lines and shorting bars are formed on the first base substrate, the scanning lines are located in the first display area and extend to the first peripheral wiring area, and the shorting bars are located in the first cutting area, a shorting bar is connected to one end of a plurality of odd-numbered scanning lines, or a shorting bar is connected to one end of a plurality of even-numbered scanning lines, to make the odd-numbered scanning lines each in an electrical connection with at least another odd-numbered scanning line, or the even-numbered scanning lines each in an electrical connection with at least another even-numbered scanning line.