LCD Pixel Electrode Open Portion for Afterimage Dispersion
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Solution Overview
Problem
The stepped structure formed by the overlap between the pixel electrode and the sustain electrode in liquid crystal displays (LCDs) leads to a difference in electric fields, causing deteriorated afterimage dispersion.
Innovation Solution
The LCD design includes a pixel electrode with an open portion on its edge that overlaps the sustain electrode, minimizing the stepped structure and maintaining a flat surface, thereby reducing afterimage dispersion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the pixel electrode overlaps the sustain electrode to maintain voltage, then voltage application is improved, but a stepped structure is formed causing afterimage dispersion deterioration
Solution Approach 1:
The pixel electrode is divided into multiple regions: a first region that overlaps the sustain electrode for voltage maintenance, and a second region that does not overlap to maintain surface flatness. This segmentation allows different portions of the pixel electrode to serve different functions simultaneously, resolving the contradiction between voltage application and surface flatness.
Solution Approach 2:
Different regions of the pixel electrode are designed with different overlapping characteristics with the sustain electrode. The first region has overlapping structure for reliable voltage application, while the second region has non-overlapping structure for maintaining flat surface, thus applying local quality differentiation to resolve the contradiction.
2Ease of manufacture
If the pixel electrode has a planar shape for simple manufacturing, then manufacturing ease is improved, but afterimage dispersion deteriorates due to stepped structure
Solution Approach 1:
The pixel electrode pattern is segmented into overlapping and non-overlapping regions with the sustain electrode. This segmentation can be implemented through standard photolithography processes by defining specific pattern areas, maintaining ease of manufacture while improving afterimage dispersion through the non-overlapping second region.
Solution Approach 2:
The solution moves from considering only the two-dimensional planar shape to incorporating the third dimension of vertical overlap control. By controlling which regions overlap in the vertical stack and which don't, the invention achieves both manufacturability and improved display performance.
Data Source
AI summary
A liquid crystal display includes a first substrate and a second substrate facing each other, a liquid crystal layer disposed between the first substrate and the second substrate, a gate line and a data line disposed on the first substrate to intersect with each other, the gate line and data line defining a pixel region, a sustain electrode disposed on the first substrate and overlapping the data line, and a pixel electrode disposed in the pixel region on the first substrate, the pixel electrode including an edge portion overlapping the sustain electrode, an open portion defined in an inner side of the edge portion and overlapping a boundary of the sustain electrode, and a central portion disposed at an inner side of the open portion.