Metal Pixel Electrode Reflectivity in Transflective Array Substrates
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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 design includes a metal pixel electrode and common electrode lines that reflect light, along with a thin-film transistor and storage capacitor, integrated with a manufacturing method that simplifies the production process by sharing steps for electrode and conductive layer formation, enhancing reflectivity and display quality in bright conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a conventional trans-flective liquid crystal display uses a transparent electrode in the reflective area, then the device can maintain transmissive and reflective properties, but the reflectivity is weak and display quality is poor in bright environments
Solution Approach 1:
The patent changes the material parameter of the pixel electrode from transparent conductive material to reflective metal material, fundamentally altering the optical properties to achieve high reflectivity while maintaining electrical functionality
Solution Approach 2:
The patent employs a composite structure combining metal reflective layer with insulating layers (first insulating layer and second insulating layer) to create a multi-functional electrode system that provides both reflection and electrical isolation properties
2Ease of manufacture
If the array substrate uses separate manufacturing processes for electrodes and conductive layers, then manufacturing precision can be maintained, but the manufacturing process becomes complex and time-consuming
Solution Approach 1:
The patent merges the formation of pixel electrodes, common electrodes, and storage capacitor electrodes into a single metal layer deposition and patterning process, eliminating multiple separate manufacturing steps while maintaining precise electrode formation through integrated photolithography patterns
Solution Approach 2:
The metal layer serves multiple functions simultaneously as pixel electrode, common electrode, and storage capacitor electrode, allowing a single manufacturing process to create all conductive elements required for display operation
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
The improved array substrate enhances display quality in bright environments by effectively using reflected light for image display, improving the overall performance of liquid crystal display devices.
Implementation Method 1
the pixel electrode is a metal layer for reflecting a light incident to the pixel electrode
Implementation Method 2
each of the common electrode line and the common electrode is a metal layer, respectively used for reflecting a light incident to the common electrode line and the common electrode
Data Source
AI summary
An array substrate and a manufacturing method. The array substrate includes a substrate, multiple gate and data lines, and multiple common electrode lines parallel with the gate lines. The substrate includes a first surface. 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, a pixel electrode and a storage capacitor disposed in the pixel region. The transistor includes a gate electrode, the first insulation layer, a channel layer, a source and drain electrode. The storage capacitor includes a first and a second conductive portion. The gate electrode, the common electrode line, the common electrode and the first conductive portion are disposed on the first surface. The channel layer, the source and drain electrode, the second conductive portion and the pixel electrode are disposed on the first insulation layer. The pixel electrode is a metal layer.