Floating Electrode Layer in LCD Contact Holes
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The existing pixel structure in liquid crystal displays faces high resistance and film-breaking probabilities at contact holes due to the thinness of the pixel electrode layer, which affects display quality, and increasing the edge distance between the floating electrode and common electrode to prevent short circuits reduces the aperture ratio.
Innovation Solution
The implementation of a floating electrode layer within the contact hole, connected to both the pixel electrode and the TFT metal layer, reduces resistance and film-breaking probabilities while maintaining a smaller black matrix size by ensuring the floating electrode is completely within the contact hole and using a shared mask process for the floating and common electrode layers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the pixel electrode layer thickness is reduced to 40-60 nanometers, then the display quality is improved, but the film-breaking probability at contact holes increases and resistance value increases
Solution Approach 1:
A floating electrode layer is introduced as an intermediary between the pixel electrode layer and the metal layer. This floating electrode layer covers the bottom surface and side walls of the contact hole, providing a conductive bridge that reduces resistance and prevents film breaking of the thin pixel electrode layer while maintaining display quality.
2Reliability
If the edge distance between the common electrode layer and floating electrode layer is increased to avoid short circuit, then the reliability is improved, but the aperture ratio decreases
Solution Approach 1:
The floating electrode layer is positioned in three-dimensional space within the contact hole, covering the bottom surface and side walls. This vertical positioning within the contact hole depth allows the common electrode layer to be placed closer horizontally, maintaining short circuit prevention while preserving aperture ratio.
3Area of stationary object
If the floating electrode layer is completely within the contact hole, then the aperture ratio is improved, but the manufacturing precision requirement increases
Solution Approach 1:
The floating electrode layer and common electrode layer are formed through a same mask process, merging two fabrication steps into one. This simultaneous formation ensures precise positioning of the floating electrode layer within the contact hole while maintaining manufacturing efficiency and reducing complexity.
Data Source
AI summary
The present invention provides an array substrate, and adds a floating electrode layer in a contact hole for realizing an electrical connection between a metal layer of a TFT and a pixel electrode layer such that the pixel electrode layer is electrically connected to the metal layer through a bridging of the floating layer so as to decrease a resistance value and decrease the film-breaking probability of the pixel electrode layer in the contact hole. Besides, an edge of the floating electrode layer is located in the contact hole so as to reduce a size of a black matrix, increase a pixel aperture ratio. The present invention also provides a method for manufacturing the array substrate and a liquid crystal display panel having the array substrate.