Array Substrate Metal Common Electrode Line Reflectivity
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Solution Overview
Problem
Conventional trans-flective liquid crystal display devices have poor display quality when reflecting external light due to weak reflectivity, which affects image display in bright environments.
Innovation Solution
The array substrate includes a metal common electrode line that reflects light and a transparent conductive common electrode, enhancing reflectivity and electrical conductivity, while the manufacturing method involves specific layer deposition and patterning steps to form gate, data, and common electrode lines, along with thin-film transistors and insulation layers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a conventional trans-flective liquid crystal display uses a transparent common electrode, then electrical conductivity is achieved, but light reflectivity is insufficient leading to poor display quality in bright environments
Solution Approach 1:
The common electrode structure combines a transparent conductive layer (such as ITO) with a metal reflective layer (such as Al, Mo, or Cu) to form a composite electrode. This composite structure simultaneously provides electrical conductivity through the transparent conductive layer and light reflectivity through the metal layer, resolving the contradiction between transparency and reflectivity in the common electrode.
2Quantity of substance
If the common electrode is made transparent to maintain conductivity, then electrical function is preserved, but reflective capability is weakened
Solution Approach 1:
The invention merges the transparent conductive layer and the metal reflective layer into a single integrated common electrode structure. The transparent conductive layer is deposited first to establish electrical connectivity, followed by the metal layer that provides reflectivity. This merging allows both materials to work together synergistically, maintaining electrical function while enhancing reflective capability.
3Illumination intensity
If a metal layer is added to enhance reflectivity, then light reflection improves, but manufacturing complexity increases
Solution Approach 1:
The metal layer in the common electrode serves multiple functions simultaneously: it provides light reflectivity for transflective display performance, acts as an additional conductive path to complement the transparent conductive layer, and can serve as a barrier layer. This multi-functionality reduces the need for separate dedicated layers, thereby limiting the increase in manufacturing complexity.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Improves display quality by utilizing the metal common electrode line for light reflection and increased electrical conductivity, enabling better image display in bright environments with enhanced transflective performance.
Implementation Method 1
the common electrode line is a metal layer for reflecting a light incident to the common electrode line
Implementation Method 2
the common electrode is a transparent conductive layer
Data Source
AI summary
An array substrate and a manufacturing method for the same. The array substrate includes a substrate, and multiple gate lines, data lines and common electrode lines. The gate lines are disposed on a first surface, and are insulated from the multiple gate lines by a first insulation layer. Among two adjacent gate lines and data lines, one pixel region is defined. The array substrate further includes a thin-film transistor, a common electrode and a pixel electrode. The thin-film transistor includes a gate electrode, a first insulation layer, a channel layer, a source electrode and a drain electrode. The multiple common electrode and gate lines are parallel and are transparent conductive layers. The channel layer, the source electrode, the drain electrode and the pixel electrode are disposed on the first insulation layer. The pixel electrode corresponds to the common electrode and electrically connected to the drain electrode.