Liquid Crystal Display Repair Pattern for Signal Integrity
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Solution Overview
Problem
In liquid crystal display devices, unwanted short circuits can form between data lines and storage electrode lines, leading to mixing of common voltage and data signals, which prevents correct signal application to pixels.
Innovation Solution
The implementation of a repair pattern or member that connects storage electrode lines of adjacent pixels, allowing for the cutting of storage electrode lines to avoid short circuits while ensuring sufficient common voltage application, and the use of laser irradiation to electrically connect repair patterns with storage electrode lines to maintain voltage integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the storage electrode line overlaps with the data line, then the device structure is simplified, but a short circuit is formed causing signal mixing
Solution Approach 1:
The storage electrode line is extracted or removed from the overlapping region with the data line. The patent describes cutting the storage electrode line in the overlapping area to eliminate the short circuit between the storage electrode line and data line, thereby separating the two conductive paths and preventing signal mixing.
Solution Approach 2:
The storage electrode line is segmented into multiple parts by cutting it in the overlapping region with the data line. This segmentation isolates the storage electrode line from the data line, preventing the formation of a continuous conductive path that would cause short circuit and signal mixing.
2Reliability
If the storage electrode line is cut to avoid short circuit, then signal integrity is improved, but common voltage application to pixels is disrupted
Solution Approach 1:
A repair pattern is introduced as an intermediary conductive element to restore the common voltage path. The repair pattern is formed in the overlapping region and electrically connected to the storage electrode line through laser irradiation, acting as a mediator that re-establishes the voltage application path without causing short circuit with the data line.
Solution Approach 2:
The electrical conductivity parameter of the repair pattern is changed from non-conductive to conductive through laser irradiation. The laser treatment modifies the material properties of the repair pattern, transforming it into a conductive path that can transmit common voltage to the pixels while maintaining isolation from the data line.
3Reliability
If the repair pattern is laser-irradiated to connect with storage electrode line, then electrical connection is achieved, but additional processing steps are required
Solution Approach 1:
The mechanical or chemical connection process is replaced with laser irradiation to achieve electrical connection. Instead of using traditional metallization or bonding processes, the patent employs laser energy to directly create conductive pathways and establish electrical connections between the repair pattern and storage electrode line, simplifying the manufacturing process.
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 solution ensures that the common voltage is adequately applied to pixels even if storage electrode lines are cut, minimizing overlap between storage electrode lines and data lines, thereby improving charge ratio and preventing signal disconnection.
Implementation Method 1
the use of laser irradiation to electrically connect repair patterns with storage electrode lines to maintain voltage integrity
Data Source
AI summary
A liquid crystal display device may include a gate line, a data line, a storage electrode set, a transistor, a pixel electrode, and repair member. The gate line may transmit a gate signal. The data line may transmit a data signal. The transistor may include a gate electrode connected to the gate line, a source electrode connected to the data line, and a drain electrode connected to the pixel electrode. The drain electrode and the storage electrode set may overlap each other and form a storage capacitor. The repair member may be formed of an electrically conductive material, may be electrically insulated from each of the drain electrode and the data line, and may overlap the storage electrode set.