Pixel Structure Patterned Transparent Conductive Layer Aperture Ratio
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional liquid crystal display panels face limitations in aperture ratio due to alignment deviations in the pixel structure, which affect the size of the connecting structure between the pixel electrode and the drain electrode, restricting image resolution and display area.
Innovation Solution
A pixel structure with a substrate, thin-film transistor, first and second insulating layers, and a patterned transparent conductive layer, where the connecting electrode extends into the first opening and is electrically connected to the drain electrode, allowing for a smaller connecting structure size by eliminating alignment dependency between openings, with the connecting electrode's length being 1 to 2.5 times the feature length of the openings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the first opening and second opening are aligned to ensure electrical connection between pixel electrode and drain electrode, then the connecting structure size increases to accommodate alignment deviations, but the aperture ratio decreases
Solution Approach 1:
The patent divides the connecting structure into multiple segments: the first opening in the protection layer, the second opening in the planarization layer, and the connecting electrode. By segmenting the connection path and allowing each segment to be optimized independently, the overall aperture ratio increases while maintaining reliable electrical connection through the multi-layer structure.
Solution Approach 2:
The patent transitions from a two-dimensional planar alignment problem to a three-dimensional multi-layer structure. By stacking the protection layer, planarization layer, and connecting electrode in different vertical levels, the design accommodates alignment deviations in the horizontal plane while maintaining electrical connection through the vertical dimension, thereby increasing the aperture ratio.
2Reliability
If the connecting structure size is increased to compensate for alignment deviations among openings and electrodes, then electrical connection reliability improves, but the pixel electrode display area decreases
Solution Approach 1:
The connecting structure is segmented into the first opening, second opening, and connecting electrode, allowing each component to be optimized for its specific function. This segmentation enables the pixel electrode to maintain a larger display area while the connecting components are precisely configured to ensure reliable electrical connection without encroaching on the display area.
Solution Approach 2:
The connecting electrode acts as an intermediary component between the pixel electrode and drain electrode. It provides a dedicated connection path that ensures electrical reliability without requiring the pixel electrode itself to be enlarged, thereby preserving the pixel electrode's display area while maintaining connection reliability.
3Area of stationary object
If the alignment precision among first opening, second opening and pixel electrode is improved, then the connecting structure size can be reduced, but manufacturing complexity increases
Solution Approach 1:
The connecting structure is divided into separately formable components (first opening, second opening, connecting electrode), each of which can be manufactured with standard precision. This segmentation allows the overall connecting structure area to be minimized without requiring ultra-high alignment precision, as each segment can be independently optimized during manufacturing.
Data Source
AI summary
The present invention provides a pixel structure including a substrate, a thin-film transistor disposed on the substrate, a first insulating layer covering the thin-film transistor and the substrate, a common electrode, a connecting electrode, a second insulating layer, and a pixel electrode. The thin-film transistor includes a drain electrode. The first insulating layer has a first opening exposing the drain electrode. The common electrode and the connecting electrode are disposed on the first insulating layer. The connecting electrode extends into the first opening to be electrically connected to the drain electrode. The connecting electrode is electrically insulated from the common electrode. The second insulating layer covers the first insulating layer, the common electrode, the connecting electrode, and has a second opening exposing the connecting electrode. The pixel electrode is disposed on the second insulating layer and electrically connected to the connecting electrode through the second opening.