Liquid Crystal Display Gate Lead Line Segmentation
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Solution Overview
Problem
When the gate lead line and data line extend in the same direction and are formed in the same layer in a liquid crystal display device, they intersect between pixels, leading to a decrease in aperture ratio and transmittance, resulting in deterioration of image quality.
Innovation Solution
A dual-gate structure is employed, where two gate lines are provided at the boundary between adjacent pixels in the column direction, and data lines are alternately arranged with gate lead lines in the same layer, preventing the need for two wires to be side by side between pixels, thus maintaining aperture ratio and transmittance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the gate lead line and data line are formed in the same layer to reduce manufacturing complexity, then the number of masks is reduced, but the aperture ratio and transmittance decrease due to wire overlap between pixels
Solution Approach 1:
The gate lead lines are segmented and positioned only in specific regions (frame region and pixel region boundaries) rather than continuously across all pixel areas. This segmentation allows the gate lead lines to be formed in the same layer as data lines without causing overlap in the pixel active areas, thus maintaining aperture ratio while simplifying manufacturing
Solution Approach 2:
The gate lead lines are strategically positioned in regions where they do not interfere with pixel formation (frame region and inter-pixel boundaries) rather than uniformly across the display area. This local positioning strategy enables same-layer formation with data lines while preserving pixel aperture and transmittance characteristics
2Device complexity
If the gate lead line extends in the same direction as the data line to simplify layer formation, then manufacturing is simplified, but the gate lead line must be disposed between pixels causing wire overlap
Solution Approach 1:
The gate lead lines are extracted from the pixel active areas and repositioned to extend only in the frame region and along pixel region boundaries. This extraction eliminates the harmful overlap with data lines in pixel areas while maintaining the beneficial same-direction extension for manufacturing simplicity
Solution Approach 2:
The gate lead lines are redirected to extend primarily in the row direction (horizontal) rather than being constrained to column direction (vertical) extensions between pixels. This dimensional change allows the gate lead lines to connect gate drivers without interfering with data line routing in the same layer
Data Source
AI summary
A liquid crystal display device includes: transistors and pixel electrodes respectively provided in pixels; a common electrode facing the pixel electrodes; gate lines extending along the first direction and supplying gate signals to the transistors respectively; gate lead lines extending along the second direction and respectively connected to the gate lines at at least one of a plurality of intersections between the gate lead lines and the gate lines; and data lines extending along the second direction and supplying data signals to the transistors respectively. The pixels are made up of a plurality of types of pixels arranged periodically and repeatedly along the first direction, the data lines and the gate lead lines are formed in a same layer, and either of the data lines and the gate lead lines are alternatively provided for boundaries between two pixels adjacent in the first direction.