LCD Data Line Overlap with Source and Drain Regions
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Liquid crystal displays (LCDs), particularly those in the vertical alignment (VA) mode, face a challenge in maintaining a high aperture ratio while improving viewing angles, as methods to enhance viewing angles often result in a reduction of the aperture ratio, leading to decreased brightness.
Innovation Solution
The design incorporates a semiconductor with polysilicon and a pixel electrode structure featuring sub-electrodes with quadrangular shapes and a unique layout that minimizes the reduction in aperture ratio, including a semiconductor extending through adjacent triple pixel regions and a common electrode with cutouts corresponding to sub-electrodes, allowing for improved brightness without compromising the aperture ratio.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If cutout patterns are formed in the pixel electrodes to improve viewing angles, then viewing angle is improved, but aperture ratio is reduced
Solution Approach 1:
The pixel electrode is divided into multiple sub-electrodes arranged in a matrix pattern. This segmentation allows the electric field to be distributed more effectively across the pixel area, improving viewing angle characteristics while maintaining a high aperture ratio by minimizing the area occupied by connecting members between sub-electrodes.
Solution Approach 2:
The patent transitions from conventional two-dimensional electrode layouts to a three-dimensional overlapping structure where the data line extends in the vertical direction to overlap both source and drain regions. This dimensional change allows electrical connection without requiring additional horizontal space, thereby preserving aperture ratio while achieving improved viewing angle through sub-electrode configuration.
2Adaptability or versatility
If sub-electrodes are formed in a pixel to improve viewing angles, then viewing angle is improved, but aperture ratio is reduced due to connecting members
Solution Approach 1:
The data line is merged with the source electrode structure, where the data line itself serves as the source electrode. This integration eliminates the need for separate connecting members between sub-electrodes, reducing the area loss from connecting structures while maintaining electrical connectivity for improved viewing angle performance.
Solution Approach 2:
The data line performs multiple functions: it serves as both the data signal transmission line and the source electrode for the thin film transistor. This multi-functionality eliminates the need for dedicated source electrode structures and connecting members, thereby maximizing the aperture ratio while still enabling sub-electrode configuration for improved viewing angles.
3Reliability
If the data line is extended to overlap the source region, then electrical connection is improved, but device complexity increases
Solution Approach 1:
The data line is merged with the source electrode, creating a unified structure that provides both data signal transmission and source electrode functionality. This integration simplifies the overall device structure by eliminating separate components while ensuring reliable electrical connection between the data line and source region through the overlapping configuration.
Data Source
AI summary
A liquid crystal display includes an insulating substrate, a semiconductor, a gate insulating layer, a gate line, an interlayer insulating layer, a data line, a drain electrode, a passivation layer, and a pixel electrode. The semiconductor is formed on the insulating substrate and includes source, drain, and channel regions. The gate line is formed on the gate insulating layer over the semiconductor, and overlaps the channel region thereof. The data line is formed on the interlayer insulating layer and has a source electrode electrically connected to the source region and a drain electrode electrically connected to the drain region. The passivation layer is formed on the data line and drain electrode. The pixel electrode is formed on the passivation layer, and electrically connected to the drain electrode. The data line overlaps the drain region.