LCD Gate Line Third Region Design for Kick-Back Voltage Stability
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Solution Overview
Problem
In liquid-crystal display (LCD) devices, variations in kick-back voltage occur due to changes in the overlapping area between the gate electrode and the drain electrode during the exposure process, leading to issues like flickering and afterimage problems.
Innovation Solution
The design includes a gate line with specific regions that maintain the overlapping area between the gate and drain electrodes unchanged before and after the exposure process, using a structure with a third region between the first and second regions, where the width of the third region is smaller than the first and second regions, ensuring consistent overlap and reducing kick-back voltage variation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the gate electrode and drain electrode overlapping area changes during exposure process, then manufacturing is simpler, but kick-back voltage varies causing display defects
Solution Approach 1:
The gate line is designed with a third region having a smaller width than the first and second regions before the exposure process. This preliminary structural design ensures that even when the mask pattern shifts during exposure, the overlapping area between the gate electrode and drain electrode remains substantially unchanged, preventing kick-back voltage variation while maintaining manufacturing simplicity
Solution Approach 2:
The width of the third region of the gate line is specifically designed to be smaller than the first and second regions. This parameter change in the gate line structure compensates for potential mask pattern shifts during exposure, maintaining a substantially constant overlapping area and stable kick-back voltage throughout the manufacturing process
2Reliability
If the overlapping area between gate and drain electrodes is maintained constant, then kick-back voltage stability improves, but device structure becomes more complex
Solution Approach 1:
The gate line is divided into three distinct regions: a first region, a third region with smaller width, and a second region. This segmentation allows the gate line to maintain a substantially constant overlapping area with the drain electrode while managing the complexity through a systematic, modular structure that is easier to manufacture with standard photolithography processes
Data Source
AI summary
A liquid-crystal display device, including: a first data line and a second data line each lengthwise extended in a first direction and spaced apart from each other, a gate line lengthwise extended in a second direction different from the first direction, the gate line defining: a first region thereof overlapping the first data line, a second region thereof overlapping the second data line and a third region thereof extended between the first region and the second region, and a pixel including a switching element, a first electrode of the switching element being connected to the first data line and a second electrode of the switching element overlapping each of the first to third regions. In the first direction, a width of the third region is smaller than a width of each of the first and second regions.