LCD Gate Line Compensation Electrode for Mask Misalignment
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Misalignment of masks during the manufacturing process of liquid crystal display (LCD) devices leads to capacitance differences between pixels, resulting in image-quality degradation due to variations in the distance between gate and drain electrodes.
Innovation Solution
The implementation of a compensation electrode and compensation bar with a closed loop shape, along with a storage line and branch electrodes, helps to minimize capacitance differences by adjusting the position of the pixel electrode and drain electrode, even when the mask is misaligned.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional gate line structure is used, then the manufacturing process is simple, but capacitance differences between pixels occur when mask misalignment happens
Solution Approach 1:
The gate line is segmented into three distinct portions: a line portion for signal transmission, an electrode portion for forming the gate electrode pattern, and a compensation portion with a closed loop shape for compensating capacitance variations. This segmentation allows each portion to perform its specific function optimally while maintaining overall capacitance consistency across pixels even when mask misalignment occurs.
Solution Approach 2:
The compensation portion acts as an intermediary element between the line portion and the pixel electrodes. It provides a reference potential and compensates for capacitance differences caused by mask misalignment, thereby maintaining uniform capacitance across all pixels without requiring complex manufacturing processes.
2Reliability
If mask misalignment is not compensated, then the manufacturing process remains straightforward, but image quality degrades due to capacitance variations
Solution Approach 1:
The compensation portion is pre-configured with a closed loop shape during the manufacturing process, before any mask misalignment occurs. This preliminary structure is designed to automatically compensate for capacitance variations that may arise during manufacturing, thereby maintaining image quality without requiring additional complex compensation mechanisms.
Solution Approach 2:
The closed loop shape of the compensation portion is specifically designed with optimized dimensions and positioning parameters. By carefully controlling the size and shape parameters of the compensation portion, the patent achieves effective capacitance compensation while keeping the overall device structure relatively simple.
3Reliability
If the drain electrode position is not adjusted, then the manufacturing process is simpler, but capacitance differences occur between adjacent pixels
Solution Approach 1:
The compensation portion is designed to create an equipotential region that equalizes the electrical potential across adjacent pixels. By configuring the compensation portion with a closed loop shape, it establishes a reference potential that compensates for position variations of the drain electrode, thereby maintaining capacitance uniformity even when the drain electrode position varies due to mask misalignment.
Data Source
AI summary
A liquid crystal display device includes a first substrate, a second substrate opposing the first substrate, a liquid crystal layer between the first substrate and the second substrate, a black matrix on one of the first substrate and the second substrate, the black matrix defining a pixel region, a gate line on the first substrate and including a line portion, an electrode portion and a compensation portion, the compensation portion having a closed loop shape, a data line intersecting the gate line, a source electrode extending from the data line and disposed on the electrode portion of the gate line, a drain electrode including one side disposed on the electrode portion of the gate line and another side at least partially disposed on the compensation portion of the gate line, and a pixel electrode connected to the drain electrode.